WO2013084022A1

WO2013084022A1 - System for adjusting surface level

Info

Publication number: WO2013084022A1
Application number: PCT/IB2011/055445
Authority: WO
Inventors: Yoash ZOLAR
Original assignee: Zolar Yoash
Priority date: 2011-12-05
Filing date: 2011-12-05
Publication date: 2013-06-13

Abstract

A system (10) for adjusting surface level, having a fixed surface (14), a moveable surface (18), a structure (24) having at least one solid rod (26, 32) being disposed between and adapted to be coupled to the fixed surface (14) and said moveable surface (18) and at least one force transfer device (52) configured to be coupled to the at least one solid rod (26, 32) and adapted to displace said structure (24).

Description

SYSTEM FOR ADJUSTING SURFACE LEVEL

FIELD OF THE INVENTION

The present invention relates to systems for adjusting surface level and more particularly to a mechanical system for adjusting floor level.

BACKGROUND OF THE INVENTION

Swimming pools create permanent danger for people, animals and objects around them, especially for babies, kids, person and animals that cannot swim, and movable objects.

Hence movable floors came to exist, so the pool has one permanent base floor, and above it a movable floor which may be lifted till it fits the pool with solid cover and adjusts the pool depth as desired by any given user: shallow for babies and kids, deep for adult users.

The following publications are believed to represent the current state of the art:

U.S. Patent Nos. 6,253,390; 4,271,542; 3,564,622; 6,640,504; 5,678,253; 3,553,743; 3,955,797; 3,413,661; 3,045,253.

U.S. Publication Nos. 20090165200; 20070220667; 20020062602.

International Publication Nos. JP2005273358; EP0532079; EP1160397.

SUMMARY OF THE INVENTION The present invention seeks to provide an improved system for adjusting surface level.

There is thus provided in accordance with a preferred embodiment of the present invention, a system for adjusting surface level, having a fixed surface, a moveable surface, a structure having at least one solid rod being disposed between and adapted to be coupled to the fixed surface and the moveable surface, and at least one force transfer device configured to be coupled to the at least one solid rod and adapted to displace the structure.

There is also provided in accordance with another preferred embodiment of the present invention a system for adjusting surface level, including a locking mechanism, having a connector that has a longitudinal slot with a proximal end a distal end, at least one solid rod having an end with a protrusion formed on said end, and the protrusion being moveable between the proximal end and the distal end, wherein the solid rod is locked relative to the connector when the protrusion is engaged with either the proximal end or the distal end.

There is also provided in accordance with yet another preferred embodiment of the present invention, a system for adjusting surface level, having a fixed surface, a moveable surface, at least one substructure having at least two hingedly connected solid rods and adapted to be coupled to the fixed surface and the moveable surface, a force transfer device configured to be coupled to the at least one substructure and adapted to displace the substructure.

There is also provided in accordance with yet another preferred embodiment of the present invention, a system for adjusting surface level, including a fixed surface, a moveable surface having at least a first portion and a second portion, which are configured to be hingedly coupled to each other, at least one force transfer device that is configured to be coupled to the fixed surface and to the at least one of the first portion and the second portion, wherein the force transfer device is configured to displace the first portion and the second portion relative to each other to selectably assume a covered position and a folded position.

There is also provided in accordance with yet another preferred embodiment of the present invention, a system for adjusting surface level, having a fixed surface, a moveable surface, at least one force transfer device that is configured to be coupled to the fixed surface and to the moveable surface, wherein the at least one force transfer device is configured to displace the moveable surface relative to the fixed surface, to selectably assume a closed position and an open position.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:

Fig. 1A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with a preferred embodiment of the invention;

Fig. IB is a simplified pictorial illustration of the system for adjusting surface level of Fig. 1A;

Fig. 1C is a simplified side view of the system for adjusting surface level of Fig. 1A;

Fig. ID is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 1A;

Fig. IE is a simplified pictorial illustration of the system for adjusting surface level of Fig. ID;

Fig. IF is a simplified side view of the system for adjusting surface level of Fig. ID;

Fig. 2A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with another preferred embodiment of the invention;

Fig. 2B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 2A;

Fig. 2C is a simplified side view of the system for adjusting surface level of Fig. 2A;

Fig. 2D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 2A;

Fig. 2E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 2D;

Fig. 2F is a simplified side view of the system for adjusting surface level of Fig. 2D; Fig. 3A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 3B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 3 A;

Fig. 3C is a simplified side view of the system for adjusting surface level of Fig. 3 A;

Fig. 3D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 3A;.

Fig. 3E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 3D;

Fig. 3F is a simplified side view of the system for adjusting surface level of Fig. 3D;

Fig. 4A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 4B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 4A;

Fig. 4C is a simplified side view of the system for adjusting surface level of Fig. 4A;

Fig. 4D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 4A;

Fig. 4E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 4D;

Fig. 4F is a simplified side view of the system for adjusting surface level of Fig. 4D;

Fig. 5A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention; Fig. 5B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 5 A;

Fig. 5C is a simplified side view of the system for adjusting surface level of Fig. 5 A;

Fig. 5D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 5A;

Fig. 5E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 5D;

Fig. 5F is a simplified side view of the system for adjusting surface level of Fig. 5D;

Fig. 6A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 6B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 6A;

Fig. 6C is a simplified side view of the system for adjusting surface level of Fig. 6A;

Fig. 6D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 6A;.

Fig. 6E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 6D;

Fig. 6F is a simplified side view of the system for adjusting surface level of Fig. 6D;

Fig. 7A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 7B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 7A;

Fig. 7C is a simplified side view of the system for adjusting surface level of Fig. 7A; Fig. 7D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 7A;

Fig. 7E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 7D;

Fig. 7F is a simplified side view of the system for adjusting surface level of Fig. 7D;

Fig. 8A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 8B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 8 A;

Fig. 8C is a simplified side view of the system for adjusting surface level of Fig. 8 A;

Fig. 8D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 8A;.

Fig. 8E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 8D;

Fig. 8F is a simplified side view of the system for adjusting surface level of Fig. 8D;

Fig. 9A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 9B is a simplified pictorial illustration of the system for adjusting surface level of Fig. 9A;

Fig. 9C is a simplified side view of the system for adjusting surface level of Fig. 9A;

Fig. 9D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 9A; Fig. 9E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 9D;

Fig. 9F is a simplified side view of the system for adjusting surface level of Fig. 9D;

Fig. 10A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 1 OB is a simplified pictorial illustration of the system for adjusting surface level of Fig. 10A;

Fig. IOC is a simplified side view of the system for adjusting surface level of Fig. 10A;

Fig. 10D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 10A;.

Fig. 10E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 10D;

Fig. 10F is a simplified side view of the system for adjusting surface level of Fig. 10D;

Fig. 11A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 11B is a simplified pictorial illustration of the system for adjusting surface level of Fig.11 A;

Fig. l lC is a simplified side view of the system for adjusting surface level of Fig. 11 A;

Fig. 11D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 11 A;

Fig. HE is a simplified pictorial illustration of the system for adjusting surface level of Fig. 1 ID;

Fig. 1 IF is a simplified side view of the system for adjusting surface level of Fig. 11D; Fig. 12A is a simplified pictorial illustration of a foldable system for adjusting surface level in a folded position in a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 12B is a simplified partially sectional illustration of the foldable system for adjusting surface level corresponding to Fig. 12 A;

Fig. 12C is a simplified side view of the foldable system for adjusting surface level of Fig. 12 A;

Fig. 12D is a simplified partial enlargement of the foldable system for adjusting surface level corresponding to Fig.12 A;

Fig. 12E is a simplified pictorial partially sectional illustration of the foldable system for adjusting surface level in a covered position in a partial section view of a pool, corresponding to Fig. 12 A;

Fig. 12F is a simplified side view of the foldable system for adjusting surface level of Fig. 12E;

Fig. 13A is a simplified pictorial illustration of a foldable system for adjusting surface level in a folded position in a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 13B is a simplified partial enlargement of the foldable system for adjusting surface level corresponding to Fig.13 A;

Fig. 13C is a simplified pictorial partially sectional illustration of the foldable system for adjusting surface level in a covered position in a partial section view of a pool, corresponding to Fig. 13 A;

Fig. 13D is a simplified partial enlargement of the foldable system for adjusting surface level corresponding to Fig. l3C;

Fig. 14A is a simplified pictorial illustration of a foldable system for adjusting surface level in a folded position in a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 14B is a simplified partially sectional illustration of the foldable system for adjusting surface level corresponding to Fig. 14 A; Fig. 14C is a simplified side view of the foldable system for adjusting surface level of Fig. 14 A.

Fig. 14D is a simplified pictorial partially sectional illustration of the foldable system for adjusting surface level in a covered position in a partial section view of a pool, corresponding to Fig. 14 A;

Fig. 14E is a simplified side view of the foldable system for adjusting surface level of Fig. 14D;

Fig. 15A is a simplified pictorial illustration of a slidable system for adjusting surface level in a closed position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 15B is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig.15 A;

Fig. 15C is a simplified pictorial illustration of the slidable system for adjusting surface level in a semi-open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 15D is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig.15 C;

Fig. 15E is a simplified pictorial illustration of the slidable system for adjusting surface level in an open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 15F is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig.l5E;

Fig. 16A is a simplified pictorial illustration of a slidable system for adjusting surface level in a closed position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 16B is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig. l6A;

Fig. 16C is a simplified pictorial illustration of the slidable system for adjusting surface level in a semi-open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 16D is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig.l6C; Fig. 16E is a simplified pictorial illustration of the slidable system for adjusting surface level in an open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 16F is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig. l6E;

Fig. 17A is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention;

Fig. 17B is a simplified pictorial illustration of the system for adjusting surface level of Fig. l7A;

Fig. 17C is a simplified side view of the system for adjusting surface level of Fig. 17A;

Fig. 17D is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 17A;

Fig. 17E is a simplified pictorial illustration of the system for adjusting surface level of Fig. 17D;

Fig. 17F is a simplified side view of the system for adjusting surface level of Fig. 17D.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Several embodiments of mechanical systems for adjustment of a surface level are described. The surface may be the floor of a swimming pool, or it may alternatively be any surface that can be vertically adjustable, such as for example a wall or a window.

According to one specific embodiment of the present invention the system for adjusting a surface level may be related to facilitate changes of the depth of a swimming pool floor, and for getting the floor inclined, whenever desired.

In accordance to the embodiments of the invention, the system may comprise means for vertical movement of the movable surface in a way that the system provides strong, stable and safe floor at any desired depth. The described system, in accordance to the embodiments of the invention is simple and inexpensive to construct and provides a stable floor with the ability to carry heavy loads, similar to regular or heavy constructed floors.

Reference is now made to Fig. 1A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with a preferred embodiment of the invention. Reference is additionally made to Fig. IB, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 1A. Reference is additionally made to Fig. 1C, which is a simplified side view of the system for adjusting surface level of Fig. 1A.

As seen in Figs. 1A, IB and 1C, there is provided a systemlO for adjusting surface level shown in a partial section of a swimming pool 12.

The swimming pool preferably has a fixed surface 14 further having side walls 16. A moveable surface 18 may preferably be disposed above the system 10 and have two opposite ends 20 each positioned adjacent the respective side wall 16 of the swimming pool 12.

There are several sliding elements 22 fixedly attached to the opposite ends 20 of the moveable surface 18 and are adapted to protect the side walls 16 of the swimming pool 12 during the movement of the moveable surface 18.

The system 10 may be comprised of a structure 24 having preferably three generally elongated solid rods, a first solid rod 26 having a first edge 28 and a second edge 30, a second solid rod 32 having a first end 34 and a second end 36 and a third solid rod 38 having a first end 40 and a second end 42. The solid rods 26, 32 and 38 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the rods 26, 32 and 38 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 26 and the second solid rod 32 are positioned substantially parallel to each other and disposed between the fixed surface 14 and the moveable surface 18. The third rod 38 may be preferably positioned transversely to the first solid rod 26 and the second solid rod 32.

It can be further seen in Figs. 1A, IB and 1C that the first end 28 of the first solid rod 26 and the first end 34 of the second solid rod 28 may each be fixed to the fixed surface 14 by means of supporting elements 44, which may present a hinge, a bearing or any other supporting element that enables to couple the solid rods 26 and 32 to the fixed surface 14.

The first end 40 of the third solid rod 38 may be hingedly coupled to the first solid rod 26 and the second end 42 of the third solid rod 38 may be hingedly coupled to the second solid rod 32.

In accordance to the embodiments of the present invention, the second end 30 of the first solid rod 26 and the second end 36 of the second solid rod 32 may each be further coupled to the moveable surface 18 by means of a connector 46. The connector 46 may be of any type that provides sliding movement of the second end 30 of the first solid rod 26 and the second end 36 of the second solid rod 32 relative to the moveable surface 18.

According to an embodiment of the present invention, the connector 46 may be of a generally elongated shaped having a longitudinal slot 48 through its length, having aproximal end and a distal end. The second end 30 of the first solid rod 26 and the second end 36 of the second solid rod 32 each having a protrusion 50 disposed thereon and radially extending therefrom. The protrusion 50 is adapted to move longitudinally along the longitudinal slot 48 of the connector 46.

The moveable surface 18 and the connectors 46 may be adapted to lie in a parallel surface and the moveable surface 18 may lean on the connectors 46. It is appreciated that the connector 46 may be of any type allowing slidable movement of the first solid rod 26 and the solid rod 32 relative the moveable surface 18.

It can be further seen in Figs. 1A, IB and 1C that a force transfer device 52 may be disposed within the swimming pool 12 and may be hingedly coupled to the first solid rod 26 and to the third solid rod 38 and also operatively coupled to the second solid rod 32. The force transfer device according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first solid rod 26, the second solid rod 32 and the third solid rod 38.

The force transfer device 52 may have a hydraulic cylinder 54 having a first end 56 and a second end 58, wherein the second end 58 is adapted to be hingedly coupled with the fixed surface 14 by means of a supporting member 60. The hydraulic cylinder 54 may be slidably associated with a plunger rod 62 having a first end 64 and a second end 66. The second end 66 of the plunger rod 62 is slidably inserted into the first end 56 of the hydraulic cylinder 54 and the first end 64 of the plunger rod 62 is hingedly connected both to the first end 40 of the third solid rod 38 and to the first solid rod 26.

In accordance to the embodiment of the present invention, when the plunger rod 62 is slidably pushed from the first end 56 of the hydraulic cylinder 54, the force transfer device 52 assumes an extended position. When the plunger rod 62 is slidably pushed toward the first end 56 of the hydraulic cylinder 54, the force transfer device 52 assumes a retracted position.

It can be seen that the system 10 in Figs. 1A, IB and 1C is shown while the force transfer device 52 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the structure 24 may be naturally locked in place and the moveable surface 18 is shown in a distance LI from the fixed surface 14, assuming a raised position of the system 10. In the raised position, the moveable surface 18 is adapted to be in line with the upper surface of the swimming pool 12, securely covering the swimming pool 12.

The solid rods 26, 32 and 38 are preferably made of durable materials that provide a rigid structural moveable surface 18 , which acts as the cover of the swimming pool 12. Reference is now made to Fig. ID, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 1 A. Reference is additionally made to Fig. IE, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. ID and reference is additionally made to Fig. IF, which is a simplified side view of the system for adjusting surface level of Fig. ID.

It can be seen that the system 10 in Figs. ID, IE and IF is shown while the force transfer device 52 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 18 is shown in a distance L2 from the fixed surface 14, while L2 is smaller than LI, assuming a lowered position of the system 10. In the lowered position, the moveable surface 18 is adapted to be lower than the upper surface of the swimming pool 12, acting as the floor of the swimming pool 12.

Reference is now made to Fig. 2A, which is a simplified pictorial illustration of a ystem for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with another preferred embodiment of the invention. Reference is additionally made to Fig. 2B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 2A and reference is additionally made to Fig. 2C, which is a simplified side view of the system for adjusting surface level of Fig. 2A.

As seen in Figs. 2A, 2B and 2C, there is provided a systemlOO for adjusting surface level shown in a partial section of a swimming pool 102.

The swimming pool 102 preferably has a fixed surface 104 further having side walls 106. A moveable surface 108 may preferably be disposed above the system 100 and have two opposite ends 110 each positioned adjacent the respective side wall 106 of the swimming pool 102.

There are several sliding elements 112 preferably fixedly attached to the opposite ends 110 of the moveable surface 108 and may be adapted to protect the side walls 106 of the swimming pool 102 during the movement of the moveable surface 108.

The system 100 may be comprised of a double structure 114 having preferably six solid rods, a first solid rod 116 having a first edge 118 and a second edge 120, a second solid rod 122 having a first end 124 and a second end 126, a third solid rod 128 having a first end 130 and a second end 132, a fourth solid rod 134 having a first end 136 and a second end 138. A fifth solid rod 140 having a first end 142 and a second end 144 and a sixth solid rod 146 having a first end 148 and a second end 150. The solid rods 116, 122 and 146 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the solid rods 116, 122 and 146 relative each to another.

The solid rods 128, 134 and 140 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the solid rods 128, 134 and 140 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 116, the second solid rod 122, the third solid rod 128 and a fourth solid rod 132 may be positioned substantially parallel to each other and disposed between the fixed surface 104 and the moveable surface 108. The fifth solid rod 140 may be preferably positioned transversely to the third solid rod 128 and the fourth solid rod 134. The sixth solid rod 146 may be preferably positioned transversely to the first solid rod 116 and the second solid rod 122.

It can be further seen in Figs. 2A, 2B and 2C that the first end 118 of the first solid rod 116, the first end 124 of the second solid rod 122, the first end 130 of the third solid rod 128 and the first end 136 of the fourth solid rod 134 may each be fixed to the fixed surface 104 by means of supporting elements 152, which may present a hinge, a bearing or any other supporting element that enables the coupling of the solid rods 116, 122, 128 and 134 to the fixed surface 104.

The first end 142 of the fifth solid rod 140 may be hingedly coupled to the third solid rod 128, the first end 148 of the sixth solid rod 146 may be hingedly coupled to the first solid rod 116, the second end 144 of the fifth solid rod 140 may be hingedly coupled to the fourth solid rod 134 and the second end 150 of the sixth solid rod 146 may be hingedly coupled to the second solid rod 122.

In accordance to the embodiments of the present invention, the second end 120 of the first solid rod 116, the second end 126 of the second solid rod 122, the second end 132 of the third solid rod 128 and the second end 138 of the fourth solid rod 134 may each be further coupled to the moveable surface 108 by means of a connector 154. The connector 154 may be of any type that provides sliding movement of the the second end 120 of the first solid rod 116, the second end 126 of the second solid rod 122, the second end 132 of the third solid rod 128 and the second end 138 of the fourth solid rod 134 relative to the moveable surface 108.

According to an embodiment of the present invention, the connector 154 is of a generally elongated shaped having a longitudinal slot 156 through its length, having a proximal end and a distal end. The second end 120 of the first solid rod 116, the second end 126 of the second solid rod 122, the second end 132 of the third solid rod 128 and the second end 138 of the fourth solid rod 134 each having a protrusion 158 disposed thereon and radially extending therefrom. The protrusion 158 may bemay be adap adapted to move longitudinally along the longitudinal slot 156 of the connector 154.

The moveable surface 108 and the connectors 154 may be adapted to lie in a parallel surface and the moveable surface 108 may lean on the connectors 154. It is appreciated that the connector 154 may be of any type allowing slidable movement of the first solid rod 116, second solid rod 122, third solid rod 128 aand fourth solid rod 134 relative the moveable surface 108.

The double solid rods structure 114 comprises a first solid rod structure 160 and a second solid rod structure 162. The first solid rod structure 160 and the second solid rod structure 162 may be securely connected by connecting rods 164. One connecting rod 164 may be disposed transversely to the first solid rod 116 and the third solid rod 128 and connecting them. An additional connecting rod 164 is disposed transversely to the second solid rod 122 and the fourth solid rod 134 and connecting them.

The first solid rod structure 160 and the second solid rod structure 162 may be adapted to move together due to the fixed connection between them by means of the connecting rods 164.

It can be further seen in Figs. 2A, 2B and 12 that a force transfer device 166 may be disposed outside the swimming pool 102. The force transfer device 166 may be hingedly operatively coupled to the first solid rod 116 and the third solid rod 128 by means of a transfer rod 168 and a connection portion 170 that is hingedly connected to the transfer rod 168, as shown in the Figs 2A, 2B and 2C. It is appreciated that the force transfer device 166 may be alternatively operatively coupled the second solid rod 122 and the fourth solid rod 134 in order to transfer the force to the system 100.

It is also appreciated that there is an advantage in placing the force transfer device 166 externally of the swimming pool 102 in order to prevent corrosion or other damage to the force transfer that may be caused by the swimming pool water.

The force transfer device 166 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first solid rod structure 160 and consequently to the second solid rod structure 162.

The force transfer device 166 may have a hydraulic cylinder 171 having a first end 172 and a second end 174, wherein the second end 174 is adapted to be hingedly coupled with a fixed surface 176 outside the swimming pool 102, by means of a supporting member 178. The hydraulic cylinder 171 may be slidably associated with a plunger rod 180 having a first end 182 and a second end 184. The second end 184 of the plunger rod 180 may be slidably inserted into the first end 172 of the hydraulic cylinder 171 and the first end 182 of the plunger rod 180 may be hingedly connected to the connection portion 170, which is in turn connected to the transfer rod 168 and thus is adapted to transfer the force from the force transfer device 166 to both to the first solid rod structure 160 and by means of the connecting rods 164 to the second solid rod structure 162.

In accordance to the embodiment of the present invention, when the plunger rod 180 is slidably pushed from the first end 172 of the hydraulic cylinder 171, the force transfer device 166 assumes an extended position. When the plunger rod 180 is slidably pushed toward the first end 172 of the hydraulic cylinder 171, the force transfer device 166 assumes a retracted position.

It can be seen that the system 100 in Figs. 2 A, 2B and 1C is shown while the force transfer device 166 assumes the extended position. In accordance to the embodiment of the present invention, in the extended position the structure 114 may be naturally locked in place, the moveable surface 108 is shown in a distance LI from the fixed surface 104, assuming a raised position of the system 100. In the raised position, the moveable surface 108 is adapted to be in line with the upper surface of the swimming pool 102, securely covering the swimming pool.

The solid rods 116, 122, 128, 134, 140 and 146 are preferably made of durable materials that provide a rigid structural moveable surface 108, which acts as the cover of the swimming pool 102.

It is within the scope of the present disclosure that several force transfer devices 166, for example two, may be positioned externally to the swimming pool 102, whereas the first force transfer device may control the movement of the solid rods 116 and 128 and the second force transfer device may control the movement of the solid rods 122 and 134. It is consequently appreciated that the above mentioned two force transfer devices may be separately controlled, such that while both are activated simultaneously, the moveable surface 108 may be movable vertically and while only one of the force transfer devices is inclined, the moveable surface 108 may be inclined. In this specific embodiment, the solid rods 164, 146, 140 and 164 would not be required, since the force is directly transferred to the structure 114 through the individual force transfer devices.

Reference is now made to Fig. 2D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 2A. Reference is additionally made to Fig. 2E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 2D and reference is a simplified side view of the system for adjusting surface level of Fig. 2D.

It can be seen that the system 100 in Figs. 2D, 2E and IF is shown while the force transfer device 166 is shown in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 108 is shown in a distance L2 from the fixed surface 104, while L2 is smaller than LI, assuming a lowered position of the system 100. In the lowered position, the moveable surface 108 is adapted to be lower than the upper surface of the swimming pool 102, acting as the floor of the swimming pool 102.

Reference is now made to Fig. 3A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 3B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 3A and reference is additionally made to Fig. 3C, which is a simplified side view of the system for adjusting surface level of Fig. 3 A.

As seen in Figs. 3A, 3B and 3C, there is provided a system 200 for adjusting surface level shown in a partial section of a swimming pool 202.

The swimming pool 202 preferably has a fixed surface 204 further having side walls 206. A moveable surface 208 may preferably be disposed above the system 200 and have two opposite ends 210 each positioned adjacent the respective side wall 206 of the swimming pool 202.

There are several sliding elements 212 preferably fixedly attached to the opposite ends 210 of the moveable surface 208 and are adapted to protect the side walls 206 of the swimming pool 202 during the movement of the moveable surface 208.

The system 200 may be comprised of a double structure 214 having preferably six solid rods, a first solid rod 216 having a first edge 218 and a second edge 220, a second solid rod 222 having a first end 224 and a second end 226, a third solid rod 228 having a first end 230 and a second end 232, a fourth solid rod 234 having a first end 236 and a second end 238. A fifth solid rod 240 having a first end 242 and a second end 244 and a sixth solid rod 246 having a first end 248 and a second end 250. The solid rods 216, 222 and 246 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the solid rods 216, 222 and 246 relative each to another.

The solid rods 228, 234 and 240 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the solid rods 228, 234 and 240 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 216, the second solid rod 222, the third solid rod 228 and a fourth solid rod 232 may be positioned substantially parallel to each other and disposed between the fixed surface 204 and the moveable surface 208. The fifth solid rod 240 may be preferably positioned transversely to the third solid rod 228 and the fourth solid rod 234. The sixth solid rod 246 may be preferably positioned transversely to the first solid rod 216 and the second solid rod 222. It can be further seen in Figs. 3 A, 3B and 3C that the first end 218 of the first solid rod 216, the first end 224 of the second solid rod 222, the first end 230 of the third solid rod 228 and the first end 236 of the fourth solid rod 234 may each be fixed to the fixed surface 204 by means of supporting elements 252, which may present a hinge, a bearing or any other supporting element that enables the coupling of the solid rods 216, 222, 228 and 234 to the fixed surface 204.

The first end 242 of the fifth solid rod 240 may be hingedly coupled to the third solid rod 228, the first end 248 of the sixth solid rod 246 may be hingedly coupled to the first solid rod 216, the second end 244 of the fifth solid rod 240 may be hingedly coupled to the fourth solid rod 234 and the second end 250 of the sixth solid rod 246 may be hingedly coupled to the second solid rod 222.

In accordance to the embodiments of the present invention, the second end 220 of the first solid rod 216, the second end 226 of the second solid rod 222, the second end 232 of the third solid rod 228 and the second end 238 of the fourth solid rod 234 may each be further coupled to the moveable surface 208 by means of a connector 254. The connector 254 may be of any type that provides sliding movement of the second end 220 of the first solid rod 216, the second end 226 of the second solid rod 222, the second end 232 of the third solid rod 228 and the second end 238 of the fourth solid rod 234 relative to the moveable surface 208.

According to an embodiment of the present invention, the connector 254 is of a generally elongated shaped having a longitudinal slot 256 through its length, having a proximal end and a distal end. The second end 220 of the first solid rod 216, the second end 226 of the second solid rod 222, the second end 232 of the third solid rod 228 and the second end 238 of the fourth solid rod 234 each having a protrusion 258 disposed thereon and radially extending therefrom. The protrusion 258 may be adapted to move longitudinally along the longitudinal slot 256 of the connector 254.

The moveable surface 208 and the connectors 254 may be adapted to lie in a parallel surface and the moveable surface 208 may lean on the connectors 254. It is appreciated that the connector 254 may be of any type allowing slidable movement of the first solid rod 216, second solid rod 222, third solid rod 228 and fourth solid rod 234 relative the moveable surface 208. The double solid rods structure 214 is comprised of a first solid rod structure 260 and a second solid rod structure 262. The first solid rod structure 260 and the second solid rod structure 262 may be securely connected by connecting rods 264. One connecting rod 264 may be disposed transversely to the first solid rod 216 and the third solid rod 228 and connecting them. An additional connecting rod 264 may be disposed transversely to the second solid rod 222 and the fourth solid rod 234 and connecting them.

The first solid rod structure 260 and the second solid rod structure 262 are adapted to move together due to the fixed connection between them by means of the connecting rods 264.

It can be further seen in Figs. 3A, 3B and 3C that a force transfer device 266 may be disposed within the swimming pool 202. The force transfer device 266 may be hingedly operatively coupled to the first solid rod 216 and the third solid rod 228 by means of the connecting rod 264. It is appreciated that the force transfer device 266 may be alternatively operatively coupled to the second solid rod 222 and fourth solid rod 234 in order to transfer the force to the system 200.

It is also appreciated that there is an advantage in placing the force transfer device 266 externally of the swimming pool 202 in order to prevent corrosion or other damage to the force transfer that may be caused by the swimming pool water.

The force transfer device 266 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first solid rod structure 260 and consequently to the second solid rod structure 262.

The force transfer device 266 may have a hydraulic cylinder 270 having a first end 272 and a second end 274, wherein the second end 274 is adapted to be hingedly coupled with the fixed surface 204, by means of a supporting element 276.

The hydraulic cylinder 270 may be slidably associated with a plunger rod 280 having a first end 282 and a second end 284. The second end 284 of the plunger rod 280 may be slidably inserted into the first end 272 of the hydraulic cylinder 270 and the first end 282 of the plunger rod 280 may be hingedly connected to the connecting rod 264 which is adapted to transfer the force from the force transfer device 266 to both to the first solid rod structure 260 and by means of the connecting rods 264 to the second solid rod structure 262.

In accordance to the embodiment of the present invention, when the plunger rod 280 is slidably pushed from the first end 272 of the hydraulic cylinder 270, the force transfer device 266 assumes an extended position. When the plunger rod 280 is slidably pushed toward the first end 272 of the hydraulic cylinder 270, the force transfer device 266 assumes a retracted position.

It can be seen that the system 200 in Figs. 3A, 3B and 3C is shown while the force transfer device 266 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the structure 214 may be naturally locked in place, the moveable surface 208 is shown in a distance LI from the fixed surface 204, assuming a raised position of the system 200. In the raised position, the moveable surface 208 is adapted to be in line with the upper surface of the swimming pool 202, securely covering the swimming pool 202.

The solid rods 216, 222, 228, 234, 240 and 246 are preferably made of durable materials that provide a rigid structural moveable surface 208, which acts as the cover of the swimming pool 202.

Reference is now made to Fig. 3D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 3A. Reference is additionally made to Fig. 3E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 3D and reference is additionally made to Fig.3F, which is a simplified side view of the system for adjusting surface level of Fig. 3D.

It can be seen that the system 200 in Figs. 3D, 3E and 3F is shown while the force transfer device 266 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 208 is shown in a distance L2 from the fixed surface 204, while L2 is smaller than LI, assuming a lowered position of the moveable system 200. In the lowered position, the moveable surface 208 is adapted to be lower than the upper surface of the swimming pool 202, acting as the floor of the swimming pool 202.

Reference is now made to Fig. 4A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 4B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 4A and reference is additionally made to Fig. 4C, which is a simplified side view of the system for adjusting surface level of Fig. 4A.

As seen in Figs. 4A, 4B and 4C, there is provided a system 300 for adjusting surface level shown in a partial section of a swimming pool 302.

The swimming pool 302 preferably has a fixed surface 304 further having side walls 306. A moveable surface 308 may preferably be disposed above the system 300 and have two opposite ends 310 each positioned adjacent the respective side wall 306 of the swimming pool 302.

There are several sliding elements 312 preferably fixedly attached to the opposite ends 310 of the moveable surface 308 and are adapted to protect the side walls 306 of the swimming pool 302 during the movement of the moveable surface 308.

The system 300 may be comprised of a structure 314 having preferably three generally elongated solid rods, a first solid rod 316 having a first edge 318 and a second edge 320, a second solid rod 322 having a first end 324 and a second end 326 and a third solid rod 328 having a first end 330 and a second end 332. The solid rods 316, 322 and 328 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the rods 316, 322 and 328 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 316 and the second solid rod 322 may be positioned substantially parallel to each other and disposed between the fixed surface 304 and the moveable surface 308. The third rod 328 may be preferably positioned transversely to the first solid rod 316 and the second solid rod 322.

It can be further seen in Figs. 4A, 4B and 4C that the first end 318 of the first solid rod 316 and the first end 324 of the second solid rod 322 may each be fixed to the fixed surface 304 by means of supporting elements 334, which may present a hinge, a bearing or any other supporting element that enables to couple the solid rods 316 and 322 to the fixed surface 304. The first end 330 of the third solid rod 328 may be hingedly coupled to the first solid rod 316 and the second end 332 of the third solid rod 328 may be hingedly coupled to the second solid rod 322.

In accordance to the embodiments of the present invention, the second end 320 of the first solid rod 316 and the second end 326 of the second solid rod 322 may each be further coupled to the moveable surface 308 by means of a connector 336. The connector 336 may be of any type that provides sliding movement of the second end 320 of the first solid rod 316 and the second end 326 of the second solid rod 322 relative to the moveable surface 308.

According to an embodiment of the present invention, the connector 336 is of a generally elongated shaped having a longitudinal slot 338 through its length, having a proximal end and a distal end. The second end 320 of the first solid rod 316 and the second end 326 of the second solid rod 322 each having a protrusion 340 disposed thereon and radially extending therefrom. The protrusion 340 is adapted to move longitudinally along the longitudinal slot 338 of the connector 336.

The moveable surface 308 and the connectors 336 may be adapted to lie in a parallel surface and the moveable surface 308 may lean on the connectors 336. It is appreciated that the connector 336 may be of any type allowing slidable movement of the first solid rod 316 and the second solid rod 322 relative the moveable surface 308.

It can be further seen in Figs. 4A, 4B and 4C that a first force transfer device 342 may be disposed within the swimming pool 302 and may be hingedly coupled to the first solid rod 316 and to the third solid rod 328 and also operatively coupled to the second solid rod 322.

It is appreciated that the first force transfer device 342 may be alternatively positioned outside of the swimming pool 302 and operatively connected to the structure 314 of the solid rods by a connection rod (not shown).

The first force transfer device 342 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 316, the second solid rod 322 and the third solid rod 328. A second force transfer device 344 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 316, the second solid rod 322 and the third solid rod 328. The second force transfer device 344 may be preferably disposed about the third solid rod 328.

The first force transfer device 342 may have a hydraulic cylinder 346 having a first end 348 and a second end 350, wherein the second end 350 is adapted to be hingedly coupled with the fixed surface 304 by means of a supporting member 352. The hydraulic cylinder 346 may be slidably associated with a plunger rod 354 having a first end 356 and a second end 358. The second end 358 of the plunger rod 354 is slidably inserted into the first end 348 of the hydraulic cylinder 346 and the first end 356 of the plunger rod 354 is hingedly connected both to the first end 330 of the third solid rod 328 and to the first solid rod 316.

In accordance to the embodiment of the present invention, when the plunger rod 354 is slidably pushed from the first end 348 of the hydraulic cylinder 346, the first force transfer device 342 assumes an extended position. When the plunger rod 354 is slidably pushed toward the first end 348 of the hydraulic cylinder 346, the first force transfer device 342 assumes a retracted position.

The second force transfer device 344 may have a hydraulic cylinder 360 having a first end 362 and a second end 364, wherein the second end 364 is adapted to be hingedly coupled with the second solid rod 322. The hydraulic cylinder 360 may be slidably associated with a plunger rod 366 having a first end 368 and a second end 370. The second end 370 of the plunger rod 366 is slidably inserted into the first end 362 of the hydraulic cylinder 360 and the first end 368 of the plunger rod 366 is hingedly connected both to the first solid rod 316 and to the first end 356 of the plunger rod 354 of the first force transfer device 342.

In accordance to the embodiment of the present invention, when the plunger rod 366 is slidably pushed from the first end 362 of the hydraulic cylinder 344, the second force transfer device 344 assumes an extended position. When the plunger rod 366 is slidably pushed toward the first end 362 of the hydraulic cylinder 360, the second force transfer device 344 assumes a retracted position. It can be seen that the system 300 in Figs. 4A, 4B and 4C is shown while the first force transfer device 342 and the second force transfer device 344 are in the extended position. In accordance to the embodiment of the present invention, in the extended position the structure 314 may be naturally locked in place, both side ends 310 of the moveable surface 308 are shown in the same distance LI from the fixed surface 304, assuming a raised position of the system 300.

In the raised position, the moveable surface 308 is adapted to be in line with the upper surface of the swimming pool 302, securely overing the swimming pool 302.

The solid rods 316, 322 and 328 are preferably made of durable materials that provide a rigid structural moveable surface 308 , which acts as the cover of the swimming pool

302.

Reference is now made to Fig. 4D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 4A. Reference is additionally made to Fig. 4E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 4D and reference is additionally made to Fig.4F, which is a simplified side view of the system for adjusting surface level of Fig. 4D.

It can be seen that the system 300 in Figs. 4D, 4E and 4F is shown while the first force transfer device 342 is in the retracted position and the second force transfer device 344 is in the extended position. In accordance to the embodiment of the present invention, in this partially retracted position.

It is appreciated that the first force transfer device 342 and the second force transfer device 344 can be individually controlled, thus the moveable surface 308 can be moved vertically in case that the second force transfer device 344 is not activated and the moveable surface 308 can be inclined in either direction in case that the first force transfer device 342 and the second force transfer device 344 are both activated.

It is also appreciated that the first force transfer device 342 and the second force transfer device 344 can be activated simultaneously or can be alternatively activated sequentially.

Reference is now made to Fig. 5A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 5B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 5 A and reference is additionally made to Fig. 5C, which is a simplified side view of the system for adjusting surface level of Fig. 5 A.

As seen in Figs. 5A, 5B and 5C, there is provided a system 400 for adjusting surface level shown in a partial section of a swimming pool 402.

The swimming pool 402 preferably has a fixed surface 404 and further has side walls 406. A moveable surface 408 may preferably be disposed above the system 400 and have two opposite ends 410 each positioned adjacent the respective side wall 406 of the swimming pool 402.

There are several sliding elements 412 preferably fixedly attached to the opposite ends 410 of the moveable surface 408 and are adapted to protect the side walls 406 of the swimming pool 402 during the movement of the moveable surface 408.

The system 400 may be comprised of a structure 414 having preferably three generally elongated solid rods, a first solid rod 416 having a first edge 418 and a second edge 420, a second solid rod 422 having a first end 424 and a second end 426 and a third solid rod 428 having a first end 430 and a second end 432. The first solid rod 416 and the third solid rod 428 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the rods 416 and 428 relative each to another. The second solid rod 422 and the third solid rod 428 are preferably coupled slidably.

In accordance to the embodiment of present invention, the first solid rod 416 and the second solid rod 422 are positioned substantially parallel to each other and disposed between the fixed surface 404 and the moveable surface 408. The third rod 428 may be preferably positioned transversely to the first solid rod 416 and the second solid rod 422.

It can be further seen in Figs. 5 A, 5B and 5C that the first end 418 of the first solid rod 416 and the first end 424 of the second solid rod 422 may each be fixed to the fixed surface 404 by means of supporting elements 434, which may present a hinge, a bearing or any other supporting element that enables to couple the solid rods 416 and 422 to the fixed surface 404. The first end 430 of the third solid rod 428 may be hingedly coupled to the first solid rod 416 and the second end 432 of the third solid rod 428 may be slidably coupled to the second solid rod 422. The second end 432 of the third solid rod 428 preferably has a longitudinal notch 435 formed thereon and the second solid rod 422 has a protrusion 437 that may be positioned along its length and extending radially outwardly from the second solid rod 422. The rotrusion 437 of the second solid rod 422 may be adapted to slidably move along the longitudinal notch 435 of the third solid rod 428.

In accordance to the embodiments of the present invention, the second end 420 of the first solid rod 416 and the second end 426 of the second solid rod 422 may each be further coupled to the moveable surface 408 by means of a connector 436. The connector 436 may be of any type that provides sliding movement of the second end 420 of the first solid rod 416 and the second end 426 of the second solid rod 422 relative to the moveable surface 408.

According to an embodiment of the present invention, the connector 436 may be of a generally elongated shape having a longitudinal slot 438 through its length, having a proximal end and a distal end. The second end 420 of the first solid rod 416 and the second end 426 of the second solid rod 422 each having a protrusion 440 disposed thereon and radially extending therefrom. The protrusion 440 may be adapted to move longitudinally along the longitudinal slot 438 of the connector 436.

The moveable surface 408 and the connectors 436 are adapted to lie in a parallel surface and the moveable surface 408 may lean on the connectors 436.

It is appreciated that the connector 436 may be of any type allowing slidable movement of the first solid rod 416 and the second solid rod 422 relative the moveable surface 408.

It can be further seen in Figs. 5A, 5B and 5C that a force transfer device 442 may be disposed within the swimming pool 402 and may be hingedly coupled to the first solid rod 416 and to the third solid rod 428 and also operatively coupled to the second solid rod 422.

It is appreciated that the force transfer device 442 may be alternatively positioned outside of the swimming pool 402 and operatively connected to the structure 414 of the solid rods by a connection rod (not shown). The force transfer device 442 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first solid rod 416, the second solid rod 422 and the third solid rod 428 and subsequently to the moveable surface 408.

A stopper 444 may be disposed on the fixed surface 404 adjacent the second solid rod 422. The stopper 444 preferably has a supporting face 445 on which the second solid rod 422 is adapted to lean at least in one of the movement positions of the moveable surface 408.

The force transfer device 442 may have a hydraulic cylinder 446 having a first end 448 and a second end 450, wherein the second end 450 is adapted to be hingedly coupled with the fixed surface 404 by means of a supporting member 452. The hydraulic cylinder 446 may be slidably associated with a plunger rod 454 having a first end 456 and a second end 458. The second end 458 of the plunger rod 454 is slidably inserted into the first end 448 of the hydraulic cylinder 446 and the first end 456 of the plunger rod 454 is hingedly connected both to the first end 430 of the third solid rod 428 and to the first solid rod 416.

In accordance to the embodiment of the present invention, when the plunger rod 454 is slidably pushed from the first end 448 of the hydraulic cylinder 446, the force transfer device 442 assumes an extended position. When the plunger rod 454 is slidably pushed toward the first end 448 of the hydraulic cylinder 446, the force transfer device 442 assumes a retracted position.

It can be seen that the system 400 in Figs. 5A, 5B and 5C is shown while the force transfer device 442 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the structure 414 may be naturally locked in place, both side ends 410 of the moveable surface 408 are adapted to be in the same distance LI from the fixed surface 404, assuming a raised position of the system 400.

In the raised position, the moveable surface 408 is adapted to be in line with the upper surface of the swimming pool 402, securely covering the swimming pool 402. The solid rods 416, 422 and 428 are preferably made of durable materials that provide a rigid structural moveable surface 408 , which acts as the cover of the swimming pool.

Reference is now made to Fig. 5D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 5A. Reference is additionally made to Fig. 5E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 5D and reference is additionally made to Fig.5F, which is a simplified side view of the system for adjusting surface level of Fig. 5D.

It can be seen that the system 400 in Figs. 5D, 5E and 5F is shown while the force transfer device 442 is in the retracted position, the protrusion 437 of the second solid rod 422 has moved axially along the longitudinal notch 435 of the third solid rod 428 and the second rod 422 leans on the supporting surface 445 of the stopper 444. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 408 is in an inclined position, wherein the distance L3 of the one of the side ends 410 of the moveable surface 408 may be greater than the distance L2 of the other of the side ends 410 of the moveable surface 408, assuming a lowered position of the system 400. In the lowered position, the moveable surface 408 is adapted to be lower than the upper surface of the swimming pool 402, acting as the floor of the swimming pool 402.

It is appreciated that the stopper 444 may be of various shapes that would allow stopping further movement of the second solid rod 422 and the slidable coupling of the second solid rod 422 and the third solid rod 428 may be of various types that allow slidable movement between the second solid rod 422 and the third solid rod 428 in order to enable inclination of the moveable surface 408.

Reference is now made to Fig. 6A which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 6B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 6A and reference is additionally made to Fig. 6C, which is a simplified side view of the system for adjusting surface level of Fig. 6A. As seen in Figs. 6 A, 6B and 6C, there is provided a system 500 for adjusting surface level shown in a partial section of a swimming pool 502.

The swimming pool 502 preferably has a fixed surface 504 and side walls 506. A moveable surface 508 may preferably be disposed above the system 500 and have two opposite ends 510 each positioned adjacent the respective side wall 506 of the swimming pool 502.

There are several sliding elements 512 fixedly attached to the opposite ends 510 of the moveable surface 508 and are adapted to protect the side walls 506 of the swimming pool 502 during the movement of the moveable surface 508.

The system 500 may be comprised of a structure 514 having preferably three generally elongated solid rods, a first solid rod 516 having a first edge 518 and a second edge 520, a second solid rod 522 having a first end 524 and a second end 526 and a third solid rod 528 having a first end 530 and a second end 532.

According to the embodiments of the present invention, the structure 514 may additionally comprise a first transfer rod 521 having a first end 523 and a second end 525 and a second transfer rod 527 having a first end 529 and a second end 531.

The first solid rod 516 and the third solid rod 528 are preferably coupled hingedly through the first transfer rod 521, by means of bearings or otherwise in order to enable pivotable movement of the rods 516 and 528 and the first support rod 521 relative each to another. The second solid rod 522 and the third solid rod 528 are preferably coupled hingedly through the second transfer rod 527, by means of bearings or otherwise in order to enable pivotable movement of the rods 522 and 528 and the second support rod 527 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 516 and the second solid rod 522 may be positioned substantially parallel to each other and disposed between the fixed surface 504 and the moveable surface 508. The first solid rod 516 and the second solid rod 522 preferably form an angle with the movable surface 508.

The third rod 528 may be preferably positioned at an angle to the first solid rod 516 and the second solid rod 522.

It can be further seen in Figs. 6A, 6B and 6C that the first end 518 of the first solid rod 516 and the first end 524 of the second solid rod 522 may each be fixed to the fixed surface 504 by means of supporting elements 534, which may present a hinge, a bearing or any other supporting element that enables to couple the solid rods 516 and 522 to the fixed surface 504. The first supporting element 534 may be also coupled to the first end 523 of the first support rod 521 and the second supporting element 534 may be also coupled to the first end 529 of the second transfer rod 527.

The first end 530 of the third solid rod 528 may be hingedly coupled to the second end 525 of the first transfer rod 521 and the second end 532 of the third solid rod 528 may be hingedly coupled to the second end 531 of the second transfer rod 527.

In accordance to the embodiments of the present invention, the second end 520 of the first solid rod 516 and the second end 526 of the second solid rod 522 may each be further coupled to the moveable surface 508 by means of a connector 536. The connector 536 may be of any type that provides sliding movement of the second end 520 of the first solid rod 516 and the second end 526 of the second solid rod 522 relative to the moveable surface 508.

According to an embodiment of the present invention, the connector 536 is of a generally elongated shaped having a longitudinal slot 538 through its length, having a distal end and a proximal end. The second end 520 of the first solid rod 516 and the second end 526 of the second solid rod 522 each having a protrusion 540 disposed thereon and radially extending therefrom. The protrusion 540 may be adapted to move longitudinally along the longitudinal slot 538 of the connector 536.

The moveable surface 508 and the connectors 536 may be adapted to lie in a parallel surface and the moveable surface 508 may lean on the connectors 536.

It is appreciated that the connector 536 may be of any type allowing slidable movement of the first solid rod 516 and the second solid rod 522 relative to the moveable surface 508.

It can be further seen in Figs. 6 A, 6B and 6C that a force transfer device 542 may be disposed within the swimming pool 502 and may be preferably hingedly coupled to the second end 531 of the second transfer rod 527 and also hingedly coupled to the second end 532 of the third solid rod 528 and operatively coupled to the first transfer rod 521 and to the first solid rod 516. It is appreciated that the force transfer device 542 may be alternatively positioned outside of the swimming pool 502 and operatively connected to the structure 514 of the solid rods by a connection rod (not shown, similar to Figs. 2A-2F).

The force transfer device 542 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 516, the second solid rod 522, the third solid rod 528, the first transfer rod 521, the second transfer rod 527 and subsequently to the moveable surface 508.

The force transfer device 542 may have a hydraulic cylinder 546 having a first end 548 and a second end 550, wherein the second end 550 is adapted to be hingedly coupled with the fixed surface 504 by means of a supporting member 552. The hydraulic cylinder 546 may be slidably associated with a plunger rod 554 having a first end 556 and a second end 558. The second end 558 of the plunger rod 554 may be slidably inserted into the first end 548 of the hydraulic cylinder 546 and the first end 556 of the plunger rod 554 may be hingedly connected both to the second end 531 of the second transfer rod 527 and to the second end 532 of the third solid rod 528.

In accordance to the embodiment of the present invention, when the plunger rod 554 is slidably pushed from the first end 548 of the hydraulic cylinder 546, the force transfer device 542 assumes an extended position. When the plunger rod 554 is slidably pushed toward the first end 548 of the hydraulic cylinder 546, the force transfer device 542 assumes a retracted position.

It can be seen that the system 500 in Figs. 6A, 6B and 6C is shown while the force transfer device 542 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the structure 514 may be naturally locked in place, the side edges 510 of the moveable surface 508 are shown in distance LI from the fixed surface 504, assuming a raised position of the moveable system 500.

In the raised position, the moveable surface 508 is adapted to be in line with the upper surface of the swimming pool 502, securely covering the swimming pool 502. The solid rods 516, 522 and 528 are preferably made of durable materials that provide a rigid structural moveable surface 508 , which acts as the cover of the swimming pool.

Reference is now made to Fig. 6D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 6A. Reference is additionally made to Fig. 6E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 6D and reference is additionally made to Fig.6F, which is a simplified side view of the system for adjusting surface level of Fig. 6D.

It can be seen that the system 500 in Figs. 6D, 6E and 6F is shown while the force transfer device 542 is in the extended position.

In accordance to the embodiment of the present invention, in the extended position the moveable surface 508 is shown in a lowered position, wherein the distance L2 of the moveable surface 508 may be smaller than the distance LI of the moveable surface 508 from the fixed surface 504, assuming a lowered position of the system 500. In the lowered position, the moveable surface 508 may be adapted to be lower than the upper surface of the swimming pool 502, acting as the floor of the swimming pool 502.

It is appreciated that the first transfer rod 521 and the second transfer rod 527 may be adapted to provided smaller clearance distance of the structure 514 from the fixed surface 504.

Reference is now made to Fig. 7 A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 7B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 7A and reference is additionally made to Fig. 7C, which is a simplified side view of the system for adjusting surface level of Fig. 7A.

As seen in Figs. 7 A, 7B and 7C, there is provided a system 600 for adjusting surface level shown in a partial section of a swimming pool 602.

The swimming pool 602 preferably has a fixed surface 604 further having side walls 606. A moveable surface 608 may preferably be disposed above the system 600 and have two opposite ends 610 each positioned adjacent the respective side walls 606 of the swimming pool 602.

There are several sliding elements 612 preferably fixedly attached to the opposite ends 610 of the moveable surface 608 and may be adapted to protect the side walls 606 of the swimming pool 602 during the movement of the moveable surface 608.

The system 600 may be comprised of a structure 614 having preferably three generally elongated solid rods, a first solid rod 616 having a first edge 618 and a second edge 620, a second solid rod 622 having a first end 624 and a second end 626 and a third solid rod 628 having a first end 630 and a second end 632.

According to the embodiments of the present invention, the structure 614 may additionally comprise a first transfer rod 621 having a first end 623 and a second end 625 and a second transfer rod 627 having a first end 629 and a second end 631.

The first solid rod 616 and the third solid rod 628 may be preferably coupled hingedly through the first transfer rod 621, by means of bearings or otherwise in order to enable pivotable movement of the rods 616 and 628 and the first support rod

621 relative each to another. The second solid rod 622 and the third solid rod 628 may be preferably coupled hingedly through the second transfer rod 627, by means of bearings or otherwise in order to enable pivotable movement of the rods 622 and 628 and the second support rod 627 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 616 and the second solid rod 622 may be positioned substantially parallel to each other and disposed between the fixed surface 604 and the moveable surface 608. The first solid rod 616 and the second solid rod 622 may preferably form an angle with the movable surface 608.

The third rod 628 may be preferably positioned at an angle to the first solid rod 616 and the second solid rod 622.

It can be further seen in Figs. 7A, 7B and 7C that the first end 618 of the first solid rod 616 and the first end 624 of the second solid rod 622 may each be fixed to the fixed surface 604 by means of supporting elements 634, which may present a hinge, a bearing or any other supporting element that enables to couple the solid rods 616 and

622 to the fixed surface 604. The first supporting element 634 may be also coupled to the first end 623 of the first support rod 621 and the second supporting element 634 may be also coupled to the first end 629 of the second transfer rod 627.

The first end 630 of the third solid rod 628 may be hingedly coupled to the second end 625 of the first transfer rod 621 and the second end 632 of the third solid rod 628 may be hingedly coupled to the second end 631 of the second transfer rod 627.

In accordance to the embodiments of the present invention, the second end 620 of the first solid rod 616 and the second end 626 of the second solid rod 622 may each be further coupled to the moveable surface 608 by means of a connector 636. The connector 636 may be of any type that provides sliding movement of the second end 620 of the first solid rod 616 and the second end 626 of the second solid rod 622 relative to the moveable surface 608.

According to an embodiment of the present invention, the connector 636 is of a generally elongated shape having a longitudinal slot 638 through its length, having a proximal end and a distal end. The second end 620 of the first solid rod 616 and the second end 626 of the second solid rod 622 each having a protrusion 640 disposed thereon and radially extending therefrom. The protrusion 640 may be adapted to move longitudinally along the longitudinal slot 638 of the connector 636.

The moveable surface 608 and the connectors 636 may be adapted to lie in a parallel surface and the moveable surface 608 may lean on the connectors 636.

It is appreciated that the connector 636 may be of any type allowing slidable movement of the first solid rod 616 and the second solid rod 622 relative the moveable surface 608.

It can be further seen in Figs. 7A, 7B and 7C that a first force transfer device 642 may be disposed within the swimming pool 602 and may be hingedly coupled to the third solid rod 628 and to the first transfer rod 621 and also operatively coupled to the first solid rod 616.

It is appreciated that the first force transfer device 642 may be alternatively positioned outside of the swimming pool 602 and operatively connected to the structure 614 of the solid rods by a connection rod (not shown).

The first force transfer device 642 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 616, the second solid rod 622 and the third solid rod 628, as well as to the first transfer rod 621 and to the second transfer rod 627.

A second force transfer device 644 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 616, the second solid rod 622 and the third solid rod 628 as well as to the first transfer rod 621 and to the second transfer rod 627.

The second force transfer device 644 may be preferably disposed about the third solid rod 628.

The first force transfer device 642 may have a hydraulic cylinder 646 having a first end 648 and a second end 650, wherein the second end 650 is adapted to be hingedly coupled with the fixed surface 604 by means of a supporting member 652. The hydraulic cylinder 646 may be slidably associated with a plunger rod 654 having a first end 656 and a second end 658. The second end 658 of the plunger rod 654 is slidably inserted into the first end 648 of the hydraulic cylinder 646 and the first end 656 of the plunger rod 654 is hingedly connected both to the first end 630 of the third solid rod 628 and to the second end 625 of the first transfer rod 621.

In accordance to the embodiment of the present invention, when the plunger rod 654 is slidably pushed from the first end 648 of the hydraulic cylinder 646, the force transfer device 642 assumes an extended position. When the plunger rod 654 is slidably pushed toward the first end 648 of the hydraulic cylinder 646, the force transfer device 642 assumes a retracted position.

The second force transfer device 644 may have a hydraulic cylinder 660 having a first end 662 and a second end 664, wherein the second end 664 is adapted to be hingedly coupled with the first force transfer device 642 and with the first transfer rod 621. The hydraulic cylinder 660 may be slidably associated with a plunger rod 666 having a first end 668 and a second end 670. The second end 670 of the plunger rod 666 is slidably inserted into the first end 662 of the hydraulic cylinder 660 and the first end 668 of the plunger rod 666 is hingedly connected both to the first solid rod 616 and to the first end 656 of the plunger rod 654 of the first force transfer device 642. In accordance to the embodiment of the present invention, when the plunger rod 666 is slidably pushed from the first end 662 of the hydraulic cylinder 644, the force transfer device 644 assumes an extended position. When the plunger rod 666 is slidably pushed toward the first end 662 of the hydraulic cylinder 660, the force transfer device 644 assumes a retracted position.

It can be seen that the system 600 in Figs. 7 A, 7B and 7C is shown while the first force transfer device 642 is shown in a partially extended position and the second force transfer device 644 is shown in the extended position. In accordance to the embodiment of the present invention, in this position the structure 614 may be naturally locked in place, both side edges 610 of the moveable surface 608 are shown in the same distance LI from the fixed surface 604, assuming a raised position of the moveable system 600.

In the raised position, The moveable surface 608 may be adapted to be in line with the upper surface of the swimming pool 602, securely covering the swimming pool 602.

The solid rods 616, 622 and 628 are preferably made of durable materials that provide a rigid structural moveable surface 608, which acts as the cover of the swimming pool 602.

Reference is now made to Fig. 7D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 7A. Reference is additionally made to Fig. 7E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 7D and reference is additionally made to Fig.7F, which is a simplified side view of the system for adjusting surface level of Fig. 7D.

It can be seen that the system 600 in Figs. 7D, 7E and 7F is shown while the first force transfer device 642 is in the retracted position and the second force transfer device 644 is in the extended position. In accordance to the embodiment of the present invention, in the partially retracted position the moveable surface 608 is in an inclined position, wherein the distance L2 of the one of the side ends 610 of the moveable surface 608 may be smaller than the distance L3 of the other of the side ends 610 of the moveable surface 608, assuming a lowered position of the system 600. In the lowered position, the moveable surface 608 may be adapted to be lower than the upper surface of the swimming pool 602, acting as the floor of the swimming pool 602.

It is appreciated that the first force transfer device 642 and the second force transfer device 644 can be individually controlled, thus the moveable surface 608 can be moved vertically in case that the second force transfer device 644 is not activated and the moveable surface 608 can be inclined in either direction in case that the first force transfer device 642 and the second force transfer device 644 are both activated.

It is also appreciated that the first force transfer device 642 and the second force transfer device 644 can be activated simultaneously or can be alternatively activated sequentially.

It is also appreciated that the first transfer rod 621 and the second transfer rod 627 may be adapted to provide smaller clearance distance of the structure 614 from the fixed surface 604.

Reference is now made to Fig. 8A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 8B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 8 A and reference is additionally made to Fig. 8C, which is a simplified side view of the system for adjusting surface level of Fig. 8 A.

As seen in Figs. 8A, 8B and 8C, there is provided a system 700 for adjusting surface level shown in a partial section of a swimming pool 702.

The swimming pool 702 preferably has an inclined fixed surface 704 and side walls 706. A moveable surface 708 may preferably be disposed above the system 700 and have two opposite ends 710 each positioned adjacent the respective side wall 706 of the swimming pool 702.

There are several sliding elements 712 preferably fixedly attached to the opposite ends 710 of the moveable surface 708 and are adapted to protect the side walls 706 of the swimming pool 702 during the movement of the moveable surface 708.

The system 700 may be comprised of a structure 714 having preferably three generally elongated solid rods, a first solid rod 716 having a first edge 718 and a second edge 720, a second solid rod 722 having a first end 724 and a second end 726 and a third solid rod 728 having a first end 730 and a second end 732. The solid rods 716, 722 and 728 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the rods 716, 722 and 728 relative each to another.

In accordance to the embodiment of present invention, the first solid rod 716 and the second solid rod 722 may be positioned substantially parallel to each other and disposed between the inclined fixed surface 704 and the moveable surface 708. The third rod 728 may be preferably positioned transversely to the first solid rod 716 and the second solid rod 722.

It can be further seen in Figs. 8 A, 8B and 8C that the first end 718 of the first solid rod 716 and the first end 724 of the second solid rod 722 may each be fixed to the inclined fixed surface 704 by means of supporting elements 734, which may present a hinge, a bearing or any other supporting element that enables to couple the solid rods 716 and 722 to the fixed surface 704.

The first end 730 of the third solid rod 728 may be hingedly coupled to the first solid rod 716 and the second end 732 of the third solid rod 728 may be hingedly coupled to the second solid rod 722.

In accordance to the embodiments of the present invention, the second end 720 of the first solid rod 716 and the second end 726 of the second solid rod 722 may each be further coupled to the moveable surface 708 by means of a connector 736. The connector 736 may be of any type that provides sliding movement of the second end 720 of the first solid rod 716 and the second end 726 of the second solid rod 722 relative to the moveable surface 708.

According to an embodiment of the present invention, the connector 736 is of a generally elongated shape having a longitudinal slot 738 through its length, having a distal end and a proximal end. The second end 720 of the first solid rod 716 and the second end 726 of the second solid rod 722 may each have a protrusion 740 disposed thereon and radially extending therefrom. The protrusion 740 may be adapted to move longitudinally along the longitudinal slot 738 of the connector 736.

The moveable surface 708 and the connectors 736 may be adapted to lie in a parallel surface and the moveable surface 708 may lean on the connectors 736. It is appreciated that the connector 736 may be of any type allowing slidable movement of the first solid rod 716 and the second solid rod 722 relative the moveable surface 708.

It can be further seen in Figs. 8A, 8B and 8C that a force transfer device 742 may be disposed within the swimming pool 702 and may be hingedly coupled to the first solid rod 716 and to the third solid rod 728 and also operatively coupled to the second solid rod 722.

It is appreciated that the force transfer device 742 may be alternatively positioned outside of the swimming pool 702 and operatively connected to the structure 714 of the solid rods by a connection rod (not shown).

The force transfer device 742 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 716, the second solid rod 722 and the third solid rod 728.

The force transfer device 742 may have a hydraulic cylinder 746 having a first end 748 and a second end 750, wherein the second end 750 is adapted to be hingedly coupled with the fixed surface 704 by means of a supporting member 752. The hydraulic cylinder 746 may be slidably associated with a plunger rod 754 having a first end 756 and a second end 758. The second end 758 of the plunger rod 754 is slidably inserted into the first end 748 of the hydraulic cylinder 746 and the first end 756 of the plunger rod 754 is hingedly connected both to the first end 730 of the third solid rod 728 and to the first solid rod 716.

In accordance to the embodiment of the present invention, when the plunger rod 754 is slidably pushed from the first end 756 of the hydraulic cylinder 746, the force transfer device 742 assumes an extended position. When the plunger rod 754 is slidably pushed toward the first end 756 of the hydraulic cylinder 746, the force transfer device 742 assumes a retracted position.

It can be seen that the system 700 in Figs. 8A, 8B and 8C is shown while the first force transfer device 742 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the structure 714 may be naturally locked in place, the first side edge 710 of the moveable surface 708 is shown in distance LI from the fixed surface 704, which may be smaller than the distance L2 between the second side edge 710 of the moveable surface 708 and the fixed surface 704, assuming a raised position of the system 700.

In the raised position, the moveable surface 708 may be adapted to be in line with the upper surface of the swimming pool 702, securely covering the swimming pool 702.

The solid rods 716, 722 and 728 are preferably made of durable materials that provide a rigid structural moveable surface 708 , which acts as the cover of the swimming pool 702.

Reference is now made to Fig. 8D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 8A. Reference is additionally made to Fig. 8E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 8D and reference is additionally made to Fig.8F, which is a simplified side view of the system for adjusting surface level of Fig. 8D.

It can be seen that the system 700 in Figs. 8D, 8E and 8F is shown while the force transfer device 742 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 708 is in lowered position, wherein the distance L3 of the one of the side ends 710 of the moveable surface 708 may be smaller than the distance L4 of the other of the side ends 710 of the moveable surface 708 from the fixed surface 704, assuming a lowered position of the system 700. In the lowered position, the moveable surface 708 may be adapted to be lower than the upper surface of the swimming pool 702, acting as the floor of the swimming pool 702.

Reference is now made to Fig. 9A, which iis a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 9B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 9A and reference is additionally made to Fig. 9C, which is a simplified side view of the system for adjusting surface level of Fig. 9A. As seen in Figs. 9A, 9B and 9C, there is provided a system 800 for adjusting surface level shown in a partial section of a swimming pool 802.

The swimming pool 802 preferably has a fixed surface 804 further having side walls 806. A moveable surface 808 may preferably be disposed above the system 800 and have two opposite ends 810 each preferably positioned adjacent the respective side wall 806 of the swimming pool 802.

Sliding elements (not shown) may be attached to the opposite ends 810 of the moveable surface 808 and may be adapted to protect the side walls 806 of the swimming pool 802 during the movement of the moveable surface 808.

The system 800 may be comprised of a structure 812, which is preferably composed of two sub-structures, a first sub-structure 814 and a second sub-structure 816 positioned adjacent the first sub-structure 814. The first sub-structure 814 preferably includes a first elongated solid rod 818, a second elongated solid rod 820 and a first force transfer device 822 that are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the elongated rods 818, 820 and the first force transfer device 822 relative each to another.

The second sub-structure 816 preferably includes a first elongated solid rod 824, a second elongated solid rod 826 and a second force transfer device 828, that are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the elongated rods 824, 826 and the second force transfer device 828 relative each to another.

The first elongated solid rod 818 of the first sub-structure 814 has a first end 830 and a second end 832. The second elongated solid rod 820 of the first substructure has a first end 834 and a second end 836.

The first elongated solid rod 824 of the second sub-structure 816 has a first end 838 and a second end 840. The second elongated solid rod 826 of the second sub-structure has a first end 842 and a second end 844.

In accordance to the embodiment of present invention, the first end 830 of the first elongated solid rod 818 of the first sub-structure 814 and the first end 838 of the first elongated solid rod 824 of the second sub-structure 816 are each preferably hingedly attached to the moveable surface 808, by means of first supporting elements 846. The second end 826 of the second elongated solid rod 820 of the first sub-structure 814 and the second end 844 of the second elongated solid rod 826 of the second sub-structure 816 are each preferably hingedly attached to the fixed surface 804, by means of second supporting elements 848 .

It can be further seen in Figs. 9A, 9B and 9C that the first force transfer device 822 may be disposed within the swimming pool 802 and may be alternatively positioned outside of the swimming pool 802 and operatively connected to the first substructure 814.

The first force transfer device 822 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interp laced in order to transfer force to the first solid rod 818 and to the second solid rod 820 of the first sub-structure 814.

The second force transfer device 828 may be disposed within the swimming pool 802 and may be alternatively positioned outside of the swimming pool 802 and operatively connected to the first sub-structure 816.

The second force transfer device 828 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first solid rod 824 and to the second solid rod 826 of the second sub-structure 816.

The first force transfer device 822 may have a hydraulic cylinder 850 having a first end 852 and a second end 854, wherein the second end 854 is adapted to be hingedly coupled with the fixed surface 804 by means of a supporting member 856. The hydraulic cylinder 850 may be slidably associated with a plunger rod 858 having a first end 860 and a second end 862. The second end 862 of the plunger rod 858 is slidably inserted into the first end 852 of the hydraulic cylinder 850 and the first end 860 of the plunger rod 858 is hingedly connected both to the second end 832 of the first solid rod 818 and the first end 834 of the second solid rod 820 of the first sub-structure 814.

In accordance to the embodiment of the present invention, when the plunger rod 858 is slidably pushed from the first end 852 of the hydraulic cylinder 850, the first force transfer device 822 assumes an extended position. When the plunger rod 858 is slidably pushed toward the first end 852 of the hydraulic cylinder 850, the first force transfer device 822 assumes a retracted position.

The second force transfer device 828 may have a hydraulic cylinder 864 having a first end 866 and a second end 868, wherein the second end 868 is adapted to be hingedly coupled with the fixed surface 804 by means of a supporting member 870. The hydraulic cylinder 864 may be slidably associated with a plunger rod 872 having a first end 874 and a second end 876. The second end 876 of the plunger rod 872 is slidably inserted into the first end 866 of the hydraulic cylinder 864 and the first end 874 of the plunger rod 872 is hingedly connected both to the second end 840 of the first solid rod 824 and the first end 842 of the second solid rod 826 of the second substructure 816.

In accordance to the embodiment of the present invention, when the plunger rod 872 is slidably pushed from the first end 866 of the hydraulic cylinder 864, the first force transfer device 828 assumes an extended position. When the plunger rod 872 is slidably pushed toward the first end 866 of the hydraulic cylinder 864, the first force transfer device 828 assumes a retracted position.

It can be seen that the system 800 in Figs. 9A, 9B and 9C is shown while the first force transfer device 822 and the second force transfer device 828 are in the extended position. In accordance to the embodiment of the present invention, in the extended position the first sub-structure 814 and the second sub-structure 816 may be preferably locked in place, both side ends 810 of the moveable surface 808 may be in the same distance LI from the fixed surface 804, assuming a raised position of the system 800.

In the raised position, the moveable surface 808 is adapted to be in line with the upper surface of the swimming pool 802, securely covering the swimming pool 802.

The solid rods 818, 820, 824 and 826 are preferably made of durable materials that provide a rigid structural moveable surface 808, which acts as the cover of the swimming pool 802.

Reference is now made to Fig. 9D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 9A. Reference is additionally made to Fig. 9E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 9D and reference is additionally made to Fig.9F, which is a simplified side view of the system for adjusting surface level of Fig. 9D.

It can be seen that the system 800 in Figs. 9D, 9E and 9F is shown while the first force transfer device 822 is in the retracted position and the second force transfer device 828 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 808 may be in a lowered position, wherein the distance L2 and L3 of the side ends 810 of the moveable surface 808 may be smaller than the distance LI, assuming a lowered position of the system 800. In the lowered position, the moveable surface 808 is adapted to be lower than the upper surface of the swimming pool 802, acting as the floor of the swimming pool 802.

It is appreciated that the first force transfer device 822 and the second force transfer device 828 can be individually controlled, thus the moveable surface 808 can be moved vertically in case that the first force transfer device 822 and the second force transfer device 828 are activated to the same extent and the moveable surface 808 can be inclined in either direction in case that the first force transfer device 822 and the second force transfer device 828 are each activated to a different extent, such that the distance L2 is different than the distance L3.

It is also appreciated that the first force transfer device 822 and the second force transfer device 828 can be activated simultaneously or can be alternatively activated sequentially.

Reference is now made to Fig. 10A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 10B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 10A. Reference is additionally made to Fig. IOC, which is a simplified side view of the system for adjusting surface level of Fig. 10A.

As seen in Figs. 10A, 10B and IOC, there is provided a system 900 for adjusting surface level shown in a partial section of a swimming pool 902. The swimming pool 902 preferably has a fixed surface 904 further having side walls 906. The moveable surface 908 may preferably be disposed above the system 900 and have two opposite ends 910 each preferably positioned adjacent the respective side wall 906 of the swimming pool 902.

There are several sliding elements 912 fixedly attached to the opposite ends 910 of the moveable surface 908 and are adapted to protect the side walls 906 of the swimming pool 902 during the movement of the moveable surface 908.

The system 900 may be comprised of a structure 914 having preferably three generally elongated solid rods, a first solid rod 916 having a first end 918 and a second end 920, a second solid rod 922 having a first end 924 and a second end 926 and a third solid rod 928 having a first end 930 and a second end 932. The solid rods 916, 922 and 928 are preferably coupled hingedly, by means of bearings or otherwise in order to enable pivotable movement of the rods 916, 922 and 928 relative each to another.

There are also provided a first supporting rod 934 having a first end 936 and a second end 938 and a second supporting rod 940 having a first end 942 and a second end 944.

The first end 936 of the first supporting rod 934 and the first end 942 of the second supporting rod 940 are preferably hingedly coupled to the fixed surface 904, by means of support elements 946. The second end 938 of the first supporting rod 934 may be hingedly coupled to the first solid rod 916 and the second end 944 of the second supporting rod 940 may be hingedly coupled to the second supporting rod 922.

In accordance to the embodiment of present invention, the first solid rod 916 and the second solid rod 922 may be positioned substantially parallel to each other and disposed between the fixed surface 904 and the moveable surface 908 and may be positioned at an angle to the fixed surface 904 and to the moveable surface 908. The third rod 928 may be preferably positioned at an angle to the first solid rod 916 and the second solid rod 922.

It can be further seen in Figs. 10A, 10B and IOC that the first end 918 of the first solid rod 916 may be hingedly coupled to the first end 930 of the third solid rod 928 and the first end 924 of the second solid rod 922 may be hingedly coupled to the second end 932 of the third solid rod 928. It is appreciated that pivoting movement is enabled between the first solid rod 916, the second solid rod 922, the third solid rod 928, the first supporting rod 934 and the second supporting rod 940.

In accordance to the embodiments of the present invention, the second end 920 of the first solid rod 916 and the second end 926 of the second solid rod 922 may each be further coupled to the moveable surface 908 by means of a connector 948. The connector 46 may be of any type that provides hinged movement of the first solid rod 916 and the second solid rod 922 relative to the moveable surface 908.

It can be further seen in Figs. 10A, 10B and IOC that a force transfer device 950 may be disposed within the swimming pool 902 and may be hingedly coupled to the second solid rod 922 and to the third solid rod 928 and also operatively coupled to the first solid rod 916. The force transfer device 950 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first solid rod 916, the second solid rod 922 and the third solid rod 928.

The force transfer device 950 may have a hydraulic cylinder 952 having a first end 954 and a second end 956, wherein the second end 956 is adapted to be hingedly coupled with the fixed surface 904 by means of a supporting member 958. The hydraulic cylinder 954 may be slidably associated with a plunger rod 960 having a first end 962 and a second end 964. The second end 964 of the plunger rod 960 is slidably inserted into the first end 954 of the hydraulic cylinder 952 and the first end 962 of the plunger rod 960 may be hingedly connected both to the first end 924 of the second solid rod 922 and to the first end 932 of the third solid rod 928.

In accordance to the embodiment of the present invention, when the plunger rod 960 is slidably pushed from the first end 954 of the hydraulic cylinder 952, the force transfer device 950 assumes an extended position. When the plunger rod 960 is slidably pushed toward the first end 954 of the hydraulic cylinder 952, the force transfer device 950 assumes a retracted position.

It can be seen that the system 900 in Figs. 10A, 10B and IOC is shown while the force transfer device 950 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the structure 914 may be naturally locked in place, the moveable surface 908 is shown in a distance LI from the fixed surface 904, assuming a raised position of the system 900. In the raised position, The moveable surface 908 may be adapted to be in line with the upper surface of the swimming pool 902, securely covering the swimming pool 902.

The solid rods 916, 922 and 928 are preferably made of durable materials that provide a rigid structural moveable surface 908 , which acts as the cover of the swimming pool 902.

Reference is now made to Fig. 10D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 10A. Reference is additionally made to Fig. 10E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 10D and reference is additionally made to Fig.1 OF, which is a simplified side view of the system for adjusting surface level of Fig. 10D.

It can be seen that the system 900 in Figs. 10D, 10E and 10F is shown while the force transfer device 950 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the moveable surface 908 is shown in a distance L2 from the fixed surface 904, while L2 is smaller than LI, assuming a lowered position of the system 900. In the lowered position, the moveable surface 908 may be adapted to be lower than the upper surface of the swimming pool 902, acting as the floor of the swimming pool 902.

Reference is now made to Fig. 11 A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 1 IB, which is a simplified pictorial illustration of the system for adjusting surface level of Fig.l 1 A and reference is additionally made to Fig. 11C, which is a simplified side view of the system for adjusting surface level of Fig. 11A.

As seen in Figs. 11 A, 11B and 11C, there is provided a system 1000 for adjusting surface level shown in a partial section of a swimming pool 1002.

The swimming pool 1002 preferably has a fixed surface 1004 further having walls 1006. A moveable surface 1008 may preferably be disposed above the system 1000 and have two opposite ends 1010 each positioned adjacent the respective side wall 1006 of the swimming pool 1002.

The system 1000 may be comprised of a structure 1012, which is preferably composed of two sub-structures, a first sub-structure 1014 and a second substructure 1016 distant from the first sub-structure 1014. The first sub-structure 1014 preferably includes a first elongated solid rod 1018 and a second elongated solid rod 1020 that are preferably coupled hingedly, by means of bearings, a hinge, a pin or otherwise in order to enable pivotable movement of the elongated rods 1018 and 1020 relative each to another.

The second sub-structure 1016 preferably includes a first elongated solid rod 1024 and a second elongated solid rod 1026, that are preferably coupled hingedly, by means of bearings, a hinge, a pin or otherwise in order to enable pivotable movement of the elongated rods 1024 and 1026 relative each to another.

The first elongated solid rod 1018 of the first sub-structure 1014 has a first end 1030 and a second end 1032. The second elongated solid rod 1020 of the first substructure has a first end 1034 and a second end 1036.

The first elongated solid rod 1024 of the second sub-structure 1016 has a first end 1038 and a second end 1040. The second elongated solid rod 1026 of the second sub-structure has a first end 1042 and a second end 1044.

In accordance to the embodiment of present invention, the first end 1038 of the first elongated solid rod 1024 of the second sub-structure 1016 may be preferably slidably attached to the moveable surface 1008, by means of a connector 1045. The connector 1045 may be of any type that provides sliding movement of the first end 1038 of the first solid rod 1024 relative to the moveable surface 1008.

According to an embodiment of the present invention, the connector 1045 may be of a generally elongated shaped having a longitudinal slot 1047 through its length, having aproximal end and a distal end. The first end 1038 of the first solid rod 1024 preferably has a protrusion 1049 disposed thereon and radially extending therefrom. The protrusion 1049 is adapted to move longitudinally along the longitudinal slot 1047 of the connector 1045.

The moveable surface 1008 and the connector 1045 may be adapted to lie in a parallel surface and the moveable surface 1008 may lean on the connectors 1045. It is appreciated that the connector 1045 may be of any type allowing slidable movement of the first solid rod 1018 relative the moveable surface 1008.

The first end 1030 of the first elongated solid rod 1018 of the first substructure 1014 may be preferably hingedly attached to the moveable surface 1008, by means of a first supporting element 1046.

The second end 1036 of the second elongated solid rod 1020 of the first substructure 1014 and the second end 1044 of the second elongated solid rod 1026 of the second sub-structure 1016 are each preferably hingedly attached to the fixed surface 1004, by means of second supporting elements 1048.

It can be further seen in Figs. 11A, 11B and 11C that a force transfer device 1049 may be hingedly coupled with the first sub-structure 1014 and may be disposed within the swimming pool 1002 and may be alternatively positioned outside of the swimming pool 1002.

The force transfer device 1049 may have a hydraulic cylinder 1050 having a first end 1052 and a second end 1054, wherein the second end 1054 is adapted to be hingedly coupled with the fixed surface 1004 by means of a supporting member 1056. The hydraulic cylinder 1050 may be slidably associated with a plunger rod 1058 having a first end 1060 and a second end 1062. The second end 1062 of the plunger rod 1058 is slidably inserted into the first end 1052 of the hydraulic cylinder 1050 and the first end 1060 of the plunger rod 1058 is hingedly connected both to the second end 1032 of the first solid rod 1018 and the first end 1034 of the second solid rod 1020 of the first sub-structure 1014.

In accordance to the embodiments of the present invention the first sub-structure 1014 and the second sub-structure 1016 are attached by a first connecting rod 1015 and a second connecting rod 1017. The first connecting rod 1015 has a first end 1019 and a second end 1021 and the second connecting rod 1017 has a first end 1023 and a second end 1025. The first end 1019 of the first connecting rod 1015 may be preferably hingedly connected to the first solid rod 1018 of the first sub-structure 1014 and the second end 1021 of the first connecting rod 1015 may be preferably connected to the second solid rod 1026 of the second sub-structure 1016.

The first end 1023 of the second connecting rod 1017 may be preferably hingedly connected to the second solid rod 1020 of the first sub-structure 1014 and the second end 1025 of the second connecting rod 1017 may be preferably hingedly connected to the second end 1040 of the first solid rod 1024 of the second sub-structure 1016.

It is appreciated that the first connecting rod 1015 and the second connecting rod 1017 may be disposed under tensile stress and since it is known that solid rods can sustain grater tensile stress than compression stress, this provides for a strong structure 1012 and consequentially a strong moveable surface 1008 that may serve as a floor for a swimming pool 1002 or any other surface that may require to carry high loads.

In accordance to the embodiment of the present invention, when the plunger rod 1058 is slidably pushed from the first end 1052 of the hydraulic cylinder 1050, the force transfer device 1049 assumes an extended position. When the plunger rod 1058 is slidably pushed toward the first end 1052 of the hydraulic cylinder 1050, the force transfer device 1049 assumes a retracted position.

It can be seen that the system 1000 in Figs. 11A, 1 IB and 11C is shown while the force transfer device 1049 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the first sub-structure 1014 and the second sub-structure 1016 are preferably locked in place, both side edges 1010 of the moveable surface 1008 are shown in the same distance LI from the fixed surface 1004, assuming a raised position of the system 1000.

In the raised position, the moveable surface 1008 may be adapted to be in line with the upper surface of the swimming pool 1002, securely covering the swimming pool 1002.

The solid rods 1018, 1020, 1024 and 1026 are preferably made of durable materials that provide a rigid structural moveable surface 1008, which acts as the cover of the swimming pool 1002.

Reference is now made to Fig. 11D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 11 A. Reference is additionally made to Fig. 1 IE, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 1 ID and reference is additionally made to Fig.1 IF, which is a simplified side view of the system for adjusting surface level of Fig. 1 ID. It can be seen that the system 1000 in Figs. 1 ID, 1 IE and 1 IF is shown while the force transfer device 1049 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 1008 is in a lowered inclined position, wherein the distance L2 of the one of the side edges 1010 of the moveable surface 1008 may be greater than the distance L3 of the other of the side edges 1010 of the moveable surface 1008, assuming a lowered position of the system 1000. In the lowered position, the moveable surface 1008 may be adapted to be lower than the upper surface of the swimming pool 1002, acting as the floor of the swimming pool 1002.

Reference is now made to Fig. 12 A, which is a simplified pictorial illustration of a foldable system for adjusting surface level in a folded position in a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 12B, which is a simplified partially sectional illustration of the foldable system for adjusting surface level corresponding to Fig. 12A and to Fig. 12C, which is a simplified side view of the foldable system for adjusting surface level of Fig. 12A and additionally to Fig. 12D, which is a simplified partial enlargement of the foldable system for adjusting surface level corresponding to Fig.12 A.

As seen in Figs. 12A, 12B, 12C and 12D, there is provided a foldable system 1100 for adjusting surface level shown in a partial section of a swimming pool 1102.

The swimming pool 1102 preferably has a fixed surface 1104 further having side walls 1106. The moveable surface 1108 may preferably be comprised of a first portion 1110 and a second portion 1112.

The first portion 1110 has a first side 1114 and a second side 1116 and the second portion 1112 has a first side 1118 and a second side 1120.

The first portion 1110 further has two opposite ends 1122 and the second portion 1112 further has two opposite ends 1124, wherein each of the ends 1122 and 1124 are positioned adjacent the respective side walls 1106 of the swimming pool 1102.

The first portion 1110 and the second portion 1112 may be hingedly attached by means of at least one first connectors 1126, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first portion 1110 and the second portion 1112. It is appreciated that there might be several such first connectors 1126 disposed along the length of the second side 1116 of the first portion 1110 and the first side 1118 of the second portion 1112.

The first portion 1110 may be preferably further hingedly attached to the side walls 1106 of the swimming pool 1102 by means of at least one second connector 1128, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first portion 1110 and the side wall 1106 of the swimming pool 1102. It is appreciated that there might be several such second connectors 1128 disposed along the length of the first side 1114 of the first portion 1110.

There may be a plurality of solid rods (not shown), that are preferably made of durable materials and are disposed beneath the first portion 1110 and the second portion 1112 along their length. These solid rods provide a rigid structural moveable surface 1108 , which may act as the cover of the swimming pool 1102.

It can be further seen in Figs. 12A, 12B, 12C and 12D that at least one force transfer device 1130 may be disposed within the swimming pool 1102. Preferably two transfer devices 1130 are shown in accordance to the embodiments of the present invention.

The force transfer devices 1130 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first portion 1110 and to the second portion 1112.

The force transfer device 1130 may have a hydraulic cylinder 1132 having a first end 1134 and a second end 1136, wherein the second end 1136 may be adapted to be hingedly coupled with the fixed surface 1104 by means of a supporting member 1138. The hydraulic cylinder 1132 may be slidably associated with a plunger rod 1140 having a first end 1142 and a second end 1144. The second end 1144 of the plunger rod 1140 is slidably inserted into the first end 1134 of the hydraulic cylinder 1132 and the first end 1142 of the plunger rod 1140 may be hingedly connected to the first portion 1110 by means of a connecting portion 1146, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first end 1142 of the plunger rod 1140 and the first portion 1110. In accordance to the embodiment of the present invention, when the plunger rod 1140 is slidably pushed from the first end 1134 of the hydraulic cylinder 1132, the force transfer device 1130 assumes an extended position. When the plunger rod 1140 is slidably pushed toward the first end 1134 of the hydraulic cylinder 1132, the force transfer device 1130 assumes a retracted position.

It can be seen that the foldable system 1100 in Figs. 12A, 12B, 12C and 12D is shown , win the folded position, while the force transfer devices 1130 are in the extended position.

In accordance to the embodiment of the present invention, in the extended position of the force transfer devices 1130, the moveable surface 1100 is folded and the internal surface of the swimming pool 1102 is exposed.

Reference is now made to Fig. 12E, which is a simplified pictorial partially sectional illustration of the foldable system for adjusting surface level in a covered position in a partial section view of a pool, corresponding to Fig. 12A and additionally to Fig. 12F, which is a simplified side view of the foldable system for adjusting surface level of Fig. 12E.

It can be seen that the moveable system 1100 in Figs. 12E and 12F is shown in the covered position, while the force transfer device 1130 is in the retracted position.

In accordance to the embodiments of the present, the first portion 1 110 and the second portion 1112 may be co-planar in the covered position, such that the first side 1114 of the first portion 1110, the second side 1116 of the first portion 1110, the first side 1118 of the second portion 1112 and the second side 1120 of the second portion 1112 may be all positioned on the same plane and create a horizontal single surface which is disposed in line with the upper surface of the swimming pool 1102, thus securely covering the swimming pool 1102.

Reference is now made to Fig. 13 A, which 13A is a simplified pictorial illustration of a foldable system for adjusting surface level in a folded position in a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and additionally to Fig. 13B, which is a simplified partial enlargement of the foldable system for adjusting surface level corresponding to Fig.13 A. As seen in Figs. 13A and 13B, there is provided a foldable system 1200 for adjusting surface level shown in a partial section of a swimming pool 1202.

The swimming pool 1202 preferably has a fixed surface 1204 further having side walls 1206. The moveable surface 1208 may preferably be comprised of a first portion 1210 and a second portion 1212.

The first portion 1210 has a first side 1214 and a second side 1216 and the second portion 1212 has a first side 1218 and a second side 1220.

The first portion 1210 further has two opposite ends 1222 and the second portion 1212 further has two opposite ends 1224, wherein each of the ends 1222 and 1224 are positioned adjacent the respective side walls 1206 of the swimming pool 1202.

The first portion 1210 and the second portion 1212 may be hingedly attached by means of at least one first connectors 1226, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first portion 1210 and the second portion 1212. It is appreciated that there might be several such first connectors 1226 disposed along the length of the second side 1216 of the first portion 1210 and the first side 1218 of the second portion 1212.

The first portion 1210 may be preferably further hingedly attached to the side walls 1206 of the swimming pool 1202 by means of at least one second connector 1228, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first portion 1210 and the side wall 1206 of the swimming pool 1202. It is appreciated that there might be several such second connectors 1228 disposed along the length of the first side 1214 of the first portion 1210.

There may be a plurality of solid rods (not shown), that are preferably made of durable materials and are disposed beneath the first portion 1210 and the second portion 1212 along their length. These solid rods provide a rigid structural moveable surface 1208 , which may act as the cover of the swimming pool 1202.

It can be further seen in Figs. 13 A, and 13B that at least one force transfer device 1230 may be disposed outside of the swimming pool 1202.

The force transfer device 1230 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first portion 1210 and to the second portion 1212.

The force transfer device 1230 may have a hydraulic cylinder 1232 having a first end 1234 and a second end 1236, wherein the second end 1236 is adapted to be hingedly coupled with the fixed surface 1204 by means of a supporting member 1238. The hydraulic cylinder 1232 may be slidably associated with a plunger rod 1240 having a first end 1242 and a second end 1244. The second end 1244 of the plunger rod 1240 is slidably inserted into the first end 1234 of the hydraulic cylinder 1232 and the first end 1242 of the plunger rod 1240 may be hingedly connected to the first portion 1210 by means of a connecting portion 1246, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first end 1242 of the plunger rod 1240 and the first portion 1210.

In accordance to the embodiment of the present invention, when the plunger rod 1240 is slidably pushed from the first end 1234 of the hydraulic cylinder 1232, the force transfer device 1230 assumes an extended position. When the plunger rod 1240 is slidably pushed toward the first end 1234 of the hydraulic cylinder 1232, the force transfer device 1230 assumes a retracted position.

It can be seen that the foldable system 1200 in Figs. 13 A and 13B is shown in the folded position while the force transfer device 1230 is in the extended position. In accordance to the embodiment of the present invention, in the extended position of the force transfer devices 1230, the foldable surface 1200 is folded and the internal surface of the swimming pool 1202 is exposed.

Reference is now made to Fig. 13C, which is a simplified pictorial partially sectional illustration of the foldable system for adjusting surface level in a covered position in a partial section view of a pool, corresponding to Fig. 13A and additionally to Fig. 13D, which 13D is a simplified partial enlargement of the foldable system for adjusting surface level corresponding to Fig. l3C.

It can be seen that the foldable system 1200 in Figs. 13C and 13D is shown in the covered position, while the force transfer device 1230 is in the retracted position.

In accordance to the embodiments of the present, the first portion 1210 and the second portion 1212 are co-planar in the covered position, such that the first side 1214 of the first portion 1210, the second side 1216 of the first portion 1210, the first side 1218 of the second portion 1212 and the second side 1220 of the second portion 1212 may all be positioned on the same plane and create a horizontal single surface which is disposed in line with the upper surface of the swimming pool 1202, thus securely covering the swimming pool 1202.

Reference is now made to Fig. 14 A, which is a simplified pictorial illustration of a foldable system for adjusting surface level in a folded position in a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 14B, which is a simplified partially sectional illustration of the foldable system for adjusting surface level corresponding to Fig. 14A and additionally to Fig. 14C, which is a simplified side view of the foldable system for adjusting surface level of Fig. 14A.

As seen in Figs. 14A, 14B and 14C, there is provided a foldable system 1300 for adjusting surface level shown in a partial section of a swimming pool 1302.

The swimming pool 1302 preferably has a fixed surface 1304 further having side walls 1306. The moveable surface 1308 may preferably be comprised of a first portion 1310 and a second portion 1312.

The first portion 1310 has a first side 1314 and a second side 1316 and the second portion 1312 has a first side 1318 and a second side 1320.

The first portion 1310 further has two opposite ends 1322 and the second portion 1312 further has two opposite ends 1324, wherein each of the ends 1322 and 1324 may be positioned adjacent the respective side walls 1306 of the swimming pool 1302.

The first portion 1310 and the second portion 1312 may be hingedly attached by means of at least one first connectors 1326, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first portion 1310 and the second portion 1312. It is appreciated that there might be several such first connectors 1326 disposed along the length of the second side 1316 of the first portion 1310 and the first side 1318 of the second portion 1312.

The first portion 1310 may be preferably further hingedly attached to the side walls 1306 of the swimming pool 1302 by means of at least one second connector 1328, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first portion 1310 and the side wall 1306 of the swimming pool 1302. It is appreciated that there might be several such second connectors 1328 disposed along the length of the first side 1314 of the first portion 1310.

There may be a plurality of solid rods (not shown), that are preferably made of durable materials and are disposed beneath the first portion 1310 and the second portion 1312 along their length. These solid rods provide a rigid structural moveable surface 1308, which may act as the cover of the swimming pool 1302.

It can be further seen in Figs. 14A, 14B and 14C that at least one force transfer device 1330 may be disposed outside within or alternatively outside of the swimming pool 1302.

The force transfer device 1330 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the first portion 1310 and to the second portion 1312.

The force transfer device 1330 may have a hydraulic cylinder 1332 having a first end 1334 and a second end 1336, wherein the second end 1336 is adapted to be hingedly coupled with either the fixed surface 1304 or the side walls 1306 of the swimming pool 1302 by means of a supporting member 1338. The hydraulic cylinder 1332 may be slidably associated with a plunger rod 1340 having a first end 1342 and a second end 1344. The second end 1344 of the plunger rod 1340 is slidably inserted into the first end 1334 of the hydraulic cylinder 1332 and the first end 1342 of the plunger rod 1340 may be hingedly connected to the second portion 1312 by means of a connecting portion 1346, which may be of the type of a hinge, bearing or any other type of connector which allows pivotal movement between the first end 1342 of the plunger rod 1340 and the second portion 1312.

In accordance to the embodiment of the present invention, when the plunger rod 1340 is slidably pushed from the first end 1334 of the hydraulic cylinder 1332, the force transfer device 1330 assumes an extended position. When the plunger rod 1340 is slidably pushed toward the first end 1334 of the hydraulic cylinder 1332, the force transfer device 1330 assumes a retracted position.

It can be seen that the foldable system 1300 in Figs. 14 A, 14B and 14C is in the folded position, while the force transfer device 1330 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position of the force transfer devices 1330, the foldable surface 1308 may be folded and the internal surface of the swimming pool 1302 is exposed.

Reference is now made to Fig. 14D, which is a simplified pictorial partially sectional illustration of the foldable system for adjusting surface level in a covered position in a partial section view of a pool, corresponding to Fig. 14A and to

Fig. 14E, 14E is a simplified side view of the foldable system for adjusting surface level of Fig. 14D.

It can be seen that the foldable system 1300 in Figs. 14D and 14E is shown in the covered position, while the force transfer device 1330 is in the extended position.

In accordance to the embodiments of the present, the first portion 1310 and the second portion 1312 may be co-planar in the covered position, such that the first side 1314 of the first portion 1310, the second side 1316 of the first portion 1310, the first side 1318 of the second portion 1312 and the second side 1320 of the second portion 1312 may all be positioned on the same plane and create a horizontal single surface which is disposed in line with the upper surface of the swimming pool 1302, thus securely covering the swimming pool 1302.

Reference is now made to Fig. 15 A, which is a simplified pictorial illustration of a slidable system for adjusting surface level in a closed position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 15B, which is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig.15 A.

As seen in Figs. 15A and 15B, there is provided a slidable system 1500 for adjusting surface level shown within a swimming pool 1502.

The swimming pool 1502 preferably has a fixed surface 1504 further having side walls 1506 and a plate positioned adjacent the fixed surface 1504 with the side walls 1506.

The moveable surface 1508 may preferably be disposed partially adjacent the slidable system 1500 and have two opposite ends 1510, each positioned adjacent the respective side walls 1506 of the swimming pool 1502. The moveable surface 1508 has a first side 1512 and a second side 1514, an upward facing surface 1516 and a downward facing surface 1518. The first side 1512 and the second side 1514 may be co-planar with the plate of the fixed surface 1504 in the closed position.

It can be further seen in Figs. 15A and 15B that at least one force transfer device 1520 may be disposed adjacent the fixed surface 1504 of the swimming pool 1502.

The force transfer device 1520 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the moveable surface 1508.

The force transfer device 1520 may have a hydraulic cylinder 1522 having a first end 1524 and a second end 1526, wherein the second end 1526 may be adapted to be hingedly coupled with either the fixed surface 1504 or the side walls 1506 of the swimming pool 1502, which present a part of the fixed surface 1504, by means of a supporting member 1528. The hydraulic cylinder 1552 may be slidably associated with a plunger rod 1530 having a first end 1532 and a second end 1534. The second end 1534 of the plunger rod 1530 is slidably inserted into the first end 1524 of the hydraulic cylinder 1522 and the first end 1532 of the plunger rod 1530 may be connected to the moveable surface 1508 by means of a connection mechanism 1536.

The connection mechanism 1536 may be comprised of a sliding path 1538 and a first guiding element 1540 and a second guiding element 1541. The sliding path may be comprised of a first rib 1542, a second rib 1544 and a third rib 1546, wherein the first rib 1542 may be disposed farther away from the plunger rod 1530 and the second rib 1544 and the third rib 1546 may be positioned above the plunger rod 1530 and one above the other, forming a space 1548 between them.

In accordance to the embodiments of the present invention, there may be two guiding elements 1540 and 1541, while the first guiding element 1540 has a first side 1550 and a second side 1552 and the second guiding element 1541 has a first side 1554 and a second side 1556. The first side 1550 of the first guiding element 1550 and the first side 1554 of the second guiding element 1541 may be coupled to the first end 1532 of the plunger rod 1530. The second side 1552 of the first guiding element may be coupled to the downward facing surface 1518 of the moveable surface 1508. The second side 1556 of the second guiding element 1541 may be slidably associated with the third rib 1546.

In accordance to the embodiment of the present invention, when the plunger rod 1530 is slidably pushed from the first end 1524 of the hydraulic cylinder 1522, the force transfer device 1520 assumes an extended position. When the plunger rod 1530 is slidably pushed toward the first end 1524 of the hydraulic cylinder 1522, the force transfer device 1520 assumes a retracted position.

It can be seen that the slidable system 1500 in Figs. 15A and 15B is shown in the closed position, while the force transfer device 1520 is in the extended position and the internal surface of the swimming pool 1502 is covered in this position. Further, the first guiding element 1540 and the second guiding element 1541 are configured to be moved accordingly to the sliding path 1538, while the guiding elements are at one end of their movement in the closed position and at an opposite end of their movement in the open position. In the closed position, the first guiding element 1540 and the second guiding element 1541 are configured to be locked.

Reference is now made to Fig. 15C, which is a simplified pictorial illustration of the slidable system for adjusting surface level in a semi-open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 15D, which is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig. l5C.

It can be seen that the slidable system 1500 in Figs. 15C and 15D is shown in the semi-open position, while the force transfer device 1520 is in a partially retracted position.

In accordance to the embodiments of the present, the moveable surface 1508 may be partially moved from its place in the semi -open position and the internal surface of the swimming pool 1502 may be partially uncovered. In the semi-open position, the plunger rod 1530 may be configured to be partially retracted towards the first end 1524 of the hydraulic cylinder and consequently pull the first guiding element 1540 and the second guiding element 1541 along with the plunger rod 1530. The guiding elements 1540 and 1541 in turn pull the moveable surface 1508 along the sliding path 1538 and downwardly into the space 1548, which is positioned below the plate of the fixed surface 1504.

Reference is now made to Fig. 15E, is a simplified pictorial illustration of the slidable system for adjusting surface level in an open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 15F, which is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig.l5E.

It can be seen that the slidable system 1500 in Figs. 15E and 15F is shown in the open position, while the force transfer device 1520 is in a retracted position.

In accordance to the embodiments of the present, the moveable surface 1508 may be removed from its place in the open position and the internal surface of the swimming pool 1502 may be uncovered. In the open position, the plunger rod 1530 may be configured to be retracted towards the first end 1524 of the hydraulic cylinder and consequently pull the first guiding element 1540 and the second guiding element 1541 along with the plunger rod 1530. The guiding elements 1540 and 1541 in turn pull the moveable surface 1508 along the sliding path 1538 and along the space 1548 towards the first end 1524 of the hydraulic cylinder 1522, such that the upwards facing surface 1516 of the moveable surface 1508 may be positioned within the space 1548, beneath the plate of the fixed surface 1504, such that the internal surface of the swimming pool 1502 may be uncovered.

Reference is now made to Fig. 16 A, which is a simplified pictorial illustration of a slidable system for adjusting surface level in a closed position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 16B, which is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig. l6A.

As seen in Figs. 16A and 16B, there is provided a slidable system 1600 for adjusting surface level shown within a swimming pool 1602.

The swimming pool 1602 preferably has a fixed surface 1604 further having side walls 1606 and a plate positioned adjacent the fixed surface 1604 with the side walls 1606. The moveable surface 1608 may preferably be disposed partially adjacent the slidable system 1600 and have two opposite ends 1610, each positioned adjacent the respective side walls 1606 of the swimming pool 1602.

The moveable surface has a first side 1612 and a second side 1614, an upward facing surface 1616 and a downward facing surface 1618. The first side 1612 and the second side 1614 may be co-planar with the plate of the fixed surface 1604 in the closed position.

It can be further seen in Figs. 16A and 16B that at least one force transfer device 1620 may be disposed adjacent the fixed surface 1604 of the swimming pool 1602.

The force transfer device 1620 according to the embodiments of the present invention may be a hydraulic cylinder, however it is appreciated that the invention is not limited to this possibility only and any available force transfer device can be interplaced in order to transfer force to the moveable surface 1608.

The force transfer device 1620 may have a hydraulic cylinder 1622 having a first end 1624 and a second end 1626, wherein the second end 1626 is adapted to be hingedly coupled with either the fixed surface 1604 or the side walls 1606 of the swimming pool 1602 by means of a supporting member 1628. The hydraulic cylinder 1652 may be slidably associated with a plunger rod 1630 having a first end 1632 and a second end 1634. The second end 1634 of the plunger rod 1630 is slidably inserted into the first end 1624 of the hydraulic cylinder 1622 and the first end 1632 of the plunger rod 1630 may be connected to the moveable surface 1608 by means of a connection mechanism 1636.

The connection mechanism 1636 may be comprised of a sliding path 1638 and a guiding element 1640. The sliding path 1638 may be comprised of a first rib 1642, a second rib 1644 and a third rib 1646, wherein the first rib 1642 may be disposed farther away from the plunger rod 1630 and the second rib 1644 and the third rib 1646 may be positioned above the plunger rod 1630 and one above the other, forming a space 1648 between them.

In accordance to the embodiments of the present invention, there may be one guiding element 1640 having a first side 1650 and a second side 1652. The first side rod 1630 and slidably associated with the third rib 1646. The second side 1652 of the guiding element 1640 may be coupled to the downward facing surface 1618 of the moveable surface 1608.

In accordance to the embodiment of the present invention, when the plunger rod 1630 is slidably pushed from the first end 1624 of the hydraulic cylinder 1622, the force transfer device 1620 assumes an extended position. When the plunger rod 1630 is slidably pushed toward the first end 1624 of the hydraulic cylinder 1622, the force transfer device 1620 assumes a retracted position.

It can be seen that the slidable system 1600 in Figs. 16A and 16B is shown in the closed position, while the force transfer device 1620 is in the extended position and the internal surface of the swimming pool 1602 is covered in this position. Further, the guiding element 1640 is configured to be moved accordingly to the sliding path 1638, while the guiding element is at one end of its movement in the closed position and at an opposite end of its movement in the open position. In the closed position, the guiding element 1640 is configured to be locked.

Reference is now made to Fig. 16C, which is a simplified pictorial illustration of the slidable system for adjusting surface level in a semi-open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 16D, which is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig. l6C.

It can be seen that the slidable system 1600 in Figs. 16C and 16D is shown in the semi-open position, while the force transfer device 1620 is in a partially retracted position.

In accordance to the embodiments of the present, the moveable surface 1608 may be partially moved from its place in the semi -open position and the internal surface of the swimming pool 1602 may be partially uncovered. In the semi-open position, the plunger rod 1630 is configured to be partially retracted towards the first end 1624 of the hydraulic cylinder and consequently pull the guiding element 1640 along with the plunger rod 1630. The guiding element 1640 in turn pull the moveable surface 1608 along the sliding path 1638 and downwardly into the space 1648, which is positioned below the plate of the fixed surface 1604. Reference is now made to Fig. 16E, which is a simplified pictorial illustration of the slidable system for adjusting surface level in an open position shown within a pool, constructed and operative in accordance with yet another preferred embodiment of the invention and to Fig. 16F, which is a simplified sectional side view illustration of the slidable system for adjusting surface level of Fig. l6E.

It can be seen that the slidable system 1600 in Figs. 16E and 16F is shown in the open position, while the force transfer device 1620 is in a retracted position.

In accordance to the embodiments of the present, the moveable surface 1608 may be removed from its place in the open position and the internal surface of the swimming pool 1602 may be uncovered. In the open position, the plunger rod 1630 is configured to be retracted towards the first end 1624 of the hydraulic cylinder and consequently pull the guiding element 1640 along with the plunger rod 1630. The guiding element 1640 in turn pull the moveable surface 1608 along the sliding path 1638 and along the space 1648 towards the first end 1624 of the hydraulic cylinder 1622, such that the upwards facing surface 1616 of the moveable surface 1608 may be positioned within the space 1648, beneath the plate of the fixed surface 1604, such that the internal surface of the swimming pool 1602 is uncovered.

Reference is now made to Fig. 17 A, which is a simplified pictorial illustration of a system for adjusting surface level in a raised position within a partial section view of a pool, constructed and operative in accordance with yet another preferred embodiment of the invention. Reference is additionally made to Fig. 17B, which is a simplified pictorial illustration of the system for adjusting surface level of Fig.l7A and reference is additionally made to Fig. 17C, which is a simplified side view of the system for adjusting surface level of Fig. 17 A.

As seen in Figs. 17 A, 17B and 17C, there is provided a system 1700 for adjusting surface level shown in a partial section of a swimming pool 1702.

The swimming pool 1702 preferably has a fixed surface 1704 further having walls 1706. A moveable surface 1708 may preferably be disposed above the system 1700 and have two opposite ends 1710 each positioned adjacent the respective side wall 1706 of the swimming pool 1702. The system 1700 may be comprised of a structure 1712, which is preferably composed of two sub-structures, a first sub-structure 1714 and a second substructure 1716 distant from the first sub-structure 1714. The first sub-structure 1714 preferably includes a first elongated solid rod 1718 and a second elongated solid rod 1720 that are preferably coupled hingedly, by means of bearings, a hinge, a pin or otherwise in order to enable pivotable movement of the elongated rods 1718 and 1720 relative each to another.

The second sub-structure 1716 preferably includes a first elongated solid rod 1724 and a second elongated solid rod 1726, that are preferably coupled hingedly, by means of bearings, a hinge, a pin or otherwise in order to enable pivotable movement of the elongated rods 1724 and 1726 relative each to another.

The first elongated solid rod 1718 of the first sub-structure 1714 has a first end 1730 and a second end 1732. The second elongated solid rod 1720 of the first substructure has a first end 1734 and a second end 1736.

The first elongated solid rod 1724 of the second sub-structure 1716 has a first end 1738 and a second end 1740. The second elongated solid rod 1726 of the second sub-structure has a first end 1742 and a second end 1744.

In accordance to the embodiment of present invention, the first end 1738 of the first elongated solid rod 1724 of the second sub-structure 1716 may be preferably slidably attached to the moveable surface 1708, by means of a connector 1745. The connector 1745 may be of any type that provides sliding movement of the first end 1738 of the first solid rod 1724 relative to the moveable surface 1708.

According to an embodiment of the present invention, the connector 1745 may be of a generally elongated shaped having a longitudinal slot 1747 through its length, having aproximal end and a distal end. The first end 1738 of the first solid rod 1724 preferably has a protrusion 1749 disposed thereon and radially extending therefrom. The protrusion 1749 is adapted to move longitudinally along the longitudinal slot 1747 of the connector 1745.

The moveable surface 1708 and the connector 1745 may be adapted to lie in a parallel surface and the moveable surface 1708 may lean on the connectors 1745. It is appreciated that the connector 1745 may be of any type allowing slidable movement of the first solid rod 1718 relative the moveable surface 1708. The first end 1730 of the first elongated solid rod 1718 of the first substructure 1714 may be preferably hingedly attached to the moveable surface 1708, by means of a first supporting element 1746.

The second end 1736 of the second elongated solid rod 1720 of the first substructure 1714 and the second end 1744 of the second elongated solid rod 1726 of the second sub-structure 1716 are each preferably hingedly attached to the fixed surface 1704, by means of second supporting elements 1748.

It can be further seen in Figs. 17A, 17B and 17C that a force transfer device 1749 may be hingedly coupled with the first sub-structure 1714 and may be disposed within the swimming pool 1702 and may be alternatively positioned outside of the swimming pool 1702.

The force transfer device 1749 may have a hydraulic cylinder 1750 having a first end 1752 and a second end 1754, wherein the second end 1754 is adapted to be hingedly coupled with the fixed surface 1704 by means of a supporting member 1756. The hydraulic cylinder 1750 may be slidably associated with a plunger rod 1758 having a first end 1760 and a second end 1762. The second end 1762 of the plunger rod 1758 is slidably inserted into the first end 1752 of the hydraulic cylinder 1750 and the first end 1760 of the plunger rod 1758 is hingedly connected both to the second end 1732 of the first solid rod 1718 and the first end 1734 of the second solid rod 1720 of the first sub-structure 1714.

In accordance to the embodiments of the present invention the first sub-structure 1714 and the second sub-structure 1716 are attached by a first connecting rod 1715 and a second connecting rod 1717. The first connecting rod 1715 has a first end 1719 and a second end 1721 and the second connecting rod 1717 has a first end 1723 and a second end 1725. The first end 1719 of the first connecting rod 1715 may be preferably hingedly connected to the first solid rod 1718 of the first sub-structure 1714 and the second end 1721 of the first connecting rod 1715 may be preferably connected to the second solid rod 1726 of the second sub-structure 1716.

The first end 1723 of the second connecting rod 1717 may be preferably hingedly connected to the second solid rod 1720 of the first sub-structure 1014 and the second end 1725 of the second connecting rod 1717 may be preferably hingedly connected to the first solid rod 1724 of the second sub-structure 1716. It is appreciated that the first connecting rod 1715 and the second connecting rod 1717 may be disposed under tensile stress and since it is known that solid rods can sustain grater tensile stress than compression stress, this provides for a strong structure 1712 and consequentially a strong moveable surface 1708 that may serve as a floor for a swimming pool 1702 or any other surface that may require to carry high loads.

In accordance to the embodiment of the present invention, when the plunger rod 1758 is slidably pushed from the first end 1752 of the hydraulic cylinder 1750, the force transfer device 1749 assumes an extended position. When the plunger rod 1758 is slidably pushed toward the first end 1752 of the hydraulic cylinder 1750, the force transfer device 1749 assumes a retracted position.

It can be seen that the system 1700 in Figs. 17A, 17B and 17C is shown while the force transfer device 1749 is in the extended position. In accordance to the embodiment of the present invention, in the extended position the first sub-structure 1714 and the second sub-structure 1716 are preferably locked in place, both side edges 1710 of the moveable surface 1708 are shown in the same distance LI from the fixed surface 1704, assuming a raised position of the system 1700.

In the raised position, the moveable surface 1708 may be adapted to be in line with the upper surface of the swimming pool 1702, securely covering the swimming pool 1702.

The solid rods 1718, 1720, 1724 and 1726 are preferably made of durable materials that provide a rigid structural moveable surface 1708, which acts as the cover of the swimming pool 1702.

Reference is now made to Fig. 17D, which is a simplified pictorial illustration of the system for adjusting surface level in a lowered position within a partial section view of a pool, corresponding to Fig. 17 A. Reference is additionally made to Fig. 17E, which is a simplified pictorial illustration of the system for adjusting surface level of Fig. 17D and reference is additionally made to Fig. l7F, which is a simplified side view of the system for adjusting surface level of Fig. 17D.

It can be seen that the system 1700 in Figs. 17D, 17E and 17F is shown while the force transfer device 1749 is in the retracted position. In accordance to the embodiment of the present invention, in the retracted position the moveable surface 1708 is in a lowered inclined position, wherein the distance L2 of the one of the side edges 1710 of the moveable surface 1708 may be greater than the distance L3 of the other of the side edges 1710 of the moveable surface 1708, assuming a lowered position of the system 1700. In the lowered position, the moveable surface 1708 may be adapted to be lower than the upper surface of the swimming pool 1702, acting as the floor of the swimming pool 1702.

It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the scope of the present invention includes both combinations and subcombinations of various features described hereinabove as well as variations and modifications thereof which are not in the prior art.

Claims

C L A I M S

1. A system for adjusting surface level, comprising:

a fixed surface;

a moveable surface;

a structure having at least one solid rod being disposed between and adapted to be coupled to said fixed surface and said moveable surface; and

at least one force transfer device configured to be coupled to the at least one solid rod and adapted to displace said structure.

2. The system for adjusting surface level according to claim 1, wherein the structure has at least two solid rods that are generally parallel to each other and each has a first end adapted to be coupled to the fixed surface and a second end adapted to be coupled to the moveable surface.

3. The system for adjusting surface level according to claim 2, wherein the first ends of the at least two solid rods adapted to be hingedly coupled to the fixed surface.

4. The system for adjusting surface level according to claim 2, wherein the structure also comprises a third solid rod adapted to be hingedly coupled to the at least two solid rods.

5. The system for adjusting surface level according to claim 2, wherein the second end of the at least one solid rod has a protrusion formed thereon.

6. The system for adjusting surface level according to claim 5, also comprising a connector adapted to couple the moveable surface and the at least one solid rod.

7. The system for adjusting surface level according to claim 6, wherein the connector has sliding means adapted to permit slidable movement of said protrusion end of the at least two solid rods relative to said moveable surface.

8. The system for adjusting surface level according to claim 7, wherein the sliding means include a longitudinal slot.

9. The system for adjusting surface level according to claim 8, wherein the protrusion is movable along the longitudinal slot.

10. The system for adjusting surface level according to claim 3, wherein the at least one first force transfer device is a hydraulic cylinder having a first end, a second end hingedly attached to the fixed surface and

a plunger rod, wherein the plunger rod has a first end hingedly attached to the at least one of the two solid rods and a second end movably attached to the first end of the hydraulic cylinder.

11. The system for adjusting surface level according to claim 10, wherein the plunger rod of the first force transfer device is configured to extend from the hydraulic cylinder following an exertion of hydraulic pressure.

12. The system for adjusting surface level according to claim 11, wherein the plunger rod is configured to move between an extended position and a retracted position in accordance to the hydraulic pressure exertion, and the moveable surface is configured to assume a position in accordance to the plunger rod position.

13. The system for adjusting surface level according to claim 12, wherein the moveable surface is configured to assume a raised position and a lowered position.

14. A system for adjusting surface level, comprising: a locking mechanism, having: a connector having a longitudinal slot having a proximal end a distal end; at least one solid rod having an end with a protrusion formed on said end; and said protrusion being moveable between said proximal end and said distal end, wherein said solid rod is locked relative to said connector when said protrusion is engaged with either said proximal end or said distal end.

15. The system for adjusting surface level according to claim 1, wherein the at least one first force transfer device is adapted to be used for a swimming pool.

16. The system for adjusting surface level according to claim 15, wherein the moveable surface has two opposed ends coupled to the side walls of the swimming pool by means of a sliding element.

17. The system for adjusting surface level according to claim 16, wherein the sliding element may be selected from the group of a wheel, a roller and a bearing.

18. The system for adjusting surface level according to claim 4, wherein the structure also comprises a second force transfer device adapted to be hingedly coupled to the at least two solid rods.

19. The system for adjusting surface level according to claim 18, wherein the second force transfer device has a plunger rode.

20. The system for adjusting surface level according to claim 19, wherein the plunger rod of the first force transfer device and the plunger rod of the second transfer device are configured to extend following an exertion of hydraulic pressure.

21. The system for adjusting surface level according to claim 20, also comprising a control system configured to exert different amounts of hydraulic pressure on the plunger rod of the first force transfer device and on the plunger rod of the second force transfer devicer providing for an inclined movement of the moveable surface.

22. The system for adjusting surface level according to claim 1 also comprising a stopper affixed to the fixed surface adjacent the one of the at least one solid rods.

23. A system for adjusting surface level, comprising:

a fixed surface;

a moveable surface;

at least one substructure having at least two hingedly connected solid rods and adapted to be coupled to said fixed surface and said moveable surface;

a force transfer device configured to be coupled to the at least one substructure and adapted to displace said substructure.

24. The system for adjusting surface level according to claim 23, wherein a first substructure has at least two hingedly connected solid rods and a first force transfer device and a second substructure has at least two hingedly connected solid rods and a second force transfer device.

25. The system for adjusting surface level according to claim 24, wherein one of the at least two solid rods of the first substructure and one of the at least two solid rods of the second substructure adapted to be hingedly attached to said moveable surface.

26. The system for adjusting surface level according to claim 24, wherein one of the at least two solid rods of the first substructure and one of the at least two solid rods of the second substructure adapted to be hingedly attached to said fixed surface.

27. The system for adjusting surface level according to claim 24, wherein the first force transfer device has a first hydraulic cylinder and a first plunger rod and the second force transfer device has a second hydraulic cylinder and a second plunger rod.

28. The system for adjusting surface level according to claim 27, wherein the first plunger rod of the first force transfer device and the second plunger rod of the second force transfer device are configured to extend following an exertion of hydraulic pressure.

29. The system for adjusting surface level according to claim 28, also comprising a control system configured to exert different amounts of hydraulic pressure on the first plunger rod of the first first force transfer device and the second plunger rod of the second force transfer device.

30. A system for adjusting surface level, comprising:

a fixed surface;

a moveable surface having at least a first portion and a second portion, which are configured to be hingedly coupled to each other;

at least one force transfer device that is configured to be coupled to the fixed surface and to the at least one of the first portion and the second portion,

wherein the force transfer device is configured to displace the first portion and the second portion relative to each other to selectably assume a covered position and a folded position.

31. The system for adjusting surface level according to claim 30, further comprising a first connector adapted to foldably couple the first portion and the second portion.

32. The system for adjusting surface level according to claim 31, further comprising a second connector adapted to hingedly couple the first portion to the fixed surface.

33. The system for adjusting surface level according to claim 30, wherein said first portion and said second portion are co-planar in the covered position.

34. The system for adjusting surface level according to claim 30, wherein the at least one force transfer device has a hydraulic cylinder having a first end, a second end hingedly attached to the fixed surface and a plunger rod, wherein the plunger rod has a first end hingedly attached to the at least one of the first portion and the second portion and a second end movably attached to the first end of the hydraulic cylinder.

35. The system for adjusting surface level according to claim 34, wherein the plunger rod is configured to extend following an exertion of hydraulic pressure.

36. The system for adjusting surface level according to claim 30, wherein the plunger rod is configured to move between an extended position and a retracted position in accordance to the hydraulic pressure exertion, and the moveable surface is configured to assume a position in accordance to the plunger rod position.

37. The system for adjusting surface level according to claim 30, wherein the at least one force transfer device is adapted to be used for a swimming pool.

38. A system for adjusting surface level, comprising:

a fixed surface;

a moveable surface;

at least one force transfer device that is configured to be coupled to the fixed surface and to the moveable surface,

wherein the at least one force transfer device is configured to displace the moveable surface relative to the fixed surface, to selectably assume a closed position and an open position.

39. The system for adjusting surface level according to claim 38 , further comprising a connection mechanism adapted to slidably couple the at least one force transfer device and the moveable surface.

40. The system for adjusting surface level according to claim 38, further comprising a connector adapted to hingedly couple the at least one force transfer device to the fixed surface.

41. The system for adjusting surface level according to claim 38, further comprising a connector adapted to fixedly couple the at least one force transfer device to the fixed surface.

42. The system for adjusting surface level according to claim 39, further comprising a plate and side walls disposed adjacent the fixed surface.

43. The system for adjusting surface level according to claim 42, wherein the moveable surface and the plat are co-planar in the closed position.

44. The system for adjusting surface level according to claim 42, wherein the moveable surface is configured to be vertically spaced from the plate in the open position.

45. The system for adjusting surface level according to claim 42, further comprising a sliding path arranged on the side walls and adapted to guide the movement of the moveable surface between the closed position and the open position.

46. The system for adjusting surface level according to claim 38, wherein the at least one force transfer device has a hydraulic cylinder having a first end, a second end hingedly attached to the side walls and a plunger rod, wherein the plunger rod has a first end adapted to be coupled to the connection mechanism and a second end movably attached to the first end of the hydraulic cylinder.

47. The system for adjusting surface level according to claim 46, wherein the plunger rod is configured to extend following an exertion of hydraulic pressure.

48. The system for adjusting surface level according to claim 38, wherein in the closed position the at least one force transfer device is extended and in the open position the at least one force transfer device is retracted.

49. The system for adjusting surface level according to claim 45, wherein the connection mechanism has at least one guiding element adapted to move along the sliding path.