EP2461878B1 - Hydraulic lifting roller stand for a trampoline - Google Patents

Description

The invention relates to a lifting roll stand for a trampoline.

With Heberoll pedestals of the type in question storage and transport of trampolines is possible. Suitable for this are collapsible trampolines. In order to use such a trampoline for gymnastic exercises, the frame is unfolded, so that at this the hammock is stretched and ready to perform the gymnastic exercises. If the trampoline is no longer needed, it is folded up and stored on two lifting roller stands. The lifting roller stands are mechanically fixed on opposite sides of the trampoline to this with adapters. The folded components of the trampoline are oriented substantially in a vertical plane. The height of the trampoline can be raised or lowered by means of the lifting roller stands. Since the Heberollständer have rollers on their undersides, if necessary, the unit of folded trampoline and the storage forming Heberollständern can be moved.

Such systems are manufactured by Eurotramp. The lifting roller stand consists essentially of a stator part, comprising a first, extending in the horizontal direction metallic support, at the longitudinal ends of each a roller is mounted and a fixed to the upper side, extending in the vertical direction second metallic tubular support. On this support a lever is attached by means of a hinge, wherein the joint divides the lever into two lever arms. At the end of the longer first lever arm, a handle for actuating the lever is provided by an operator. At the end of the second lever arm is an adapter for attaching the lever to the trampoline. The adapter is in the form of a cylindrical tube piece which can be inserted into a hollow cylindrical receptacle on the trampoline. Once the adapter is inserted into the receptacle, the trampoline can be raised or lowered by pivoting the lever. In a lower and upper limit position while the lever can be secured in position by a securing bolt on the vertical support.

An advantage of this Heberollständer is that this has a very robust design and its operation is easy to carry out even by unskilled personnel. The disadvantage, however, is that for the operator, the actuation of the lever when lifting the trampoline with an undesirably high amount of force is connected, since the pressing takes place against the entire weight of the trampoline. Conversely, a lowering of the trampoline by means of the lever is associated with dangers, since then the entire weight of the trampoline rests on the lever. If this is suddenly released by the operator, the lever moves up unchecked. To protect against such uncontrolled movements of the safety bolt, which must first be manually released, or the lever can be pivoted from a limit position. According to the safety instructions attached to the lift stand, the operator has to operate the safety bolt with one hand and the handle of the lever with the other hand. However, if the operators ignore the existing safety instructions, it may happen that the operator inserts a hand between the vertical supports and the second lever arm when the lever is pivoted. If the lever is then moved too quickly, trapping of the hand can cause operator injuries.

The WO 2008/138372 A1 relates to a lifting stand for a trampoline, with a mounted on rollers stand part with a guide in which an am Trampoline fixable guide element is mounted vertically adjustable, which has an adapter for fixing to the trampoline, and with an actuating element for height adjustment of the guide element. The guide element and the guide are coupled via a hydropneumatic adjusting element, by means of which a force directed against the weight force is generated.

The US 3,156,318 A relates to a lifting jack stand with a support having on its underside rollers and a tube attached to the top perpendicular to this extending, on which an outer tube is slidably mounted, in which a mechanical spring is guided. For mounting on a trampoline, the lifting tool stand is fastened to the trampoline at the upper end of the pipe. Since the lift stand is higher than the bearing point on the trampoline, then the lift stand is inclined. An operator must then straighten the lift stand by applying mechanical pressure and lift the trampoline. The trampoline mounted on two lifting stands can then be moved. In order to ensure passage through low doors, the outer tube can be pressed against the spring force of the spring in a lower end position and then locked by means of mechanical locking element.

The invention has for its object to provide a lifting jack stand of the type mentioned for trampolines, which can be operated with high safety standard easy and with little effort.
To solve this problem, the features of claim 1 are provided. Advantageous embodiments and expedient developments of the invention are described in the subclaims.
The lifting stand for a trampoline according to the invention comprises a stand part mounted on rollers with a guide. In the guide a fixable on the trampoline guide element is arranged height adjustable. The guide element has an adapter for fixing to the trampoline and an actuating element for height adjustment of the guide element. The adapter has a circular cylindrical shape and opens at the upper end of the guide element, and the adapter is insertable into a hollow cylindrical receptacle on the trampoline. As a means for height adjustment, a hydraulic unit is provided. With this a retraction and extension of the guide element in the guide for carrying out the height adjustment is guaranteed. Alone with the hydraulic unit a set height position of the guide element is held in the guide. The actuator for actuating the hydraulic unit is a pedal.
A significant advantage of the invention Heberollständers is that with the foot lever retraction and extension of the guide element in the guide and thus the implementation of the height adjustment of the lift stand can be performed easily and quickly even by inexperienced people and even children. It is particularly advantageous that there is no security risk in the foot operation of the foot lever. In particular, there is no risk of pinching the limbs of the respective operator in the operation of the foot pedal. Since thus risk of injury to the operator can be excluded with high security in the operation of the pedal, the lifting tool according to the invention meets a very high safety standard.

Another significant advantage of the invention is that lifting and lowering of a trampoline can be performed with little effort by the built-in Heberollständer hydraulic unit.

Another advantage of the hydraulic unit used is that with this not only a simple retraction and extension of the guide element in the guide for carrying out the height adjustment is guaranteed. Rather, it is achieved alone with the hydraulic unit, without the use of further mechanical latching means that a set height position of the guide element is securely held in the guide.

Finally, it is advantageous that the hydraulic unit has damping properties.

This prevents uncontrolled, rapid downward movement of the lift stand when improper operation of the actuator, whereby the risk of injury to the operator in handling the lift stand is further reduced.

To store a trampoline, two lifting racks are required, which are attached to opposite sides of the trampoline. The lift stand is designed so that it can be mounted on either side of the trampoline. Thus, only one design of the lifting roller stand for the storage of a trampoline is needed. Due to the height adjustability of the lifting roller stand, the trampoline can be stored at different heights on the lifting roller stands. Advantageously, a lower target position, dimensioned so that the total height of the mounted on the Heberoll pedestals trampoline are smaller than the heights of doors in buildings, so that the trampoline can be pushed at the Heberollständern through such door openings therethrough.

Figur 1:

Draufsicht auf ein zusammengeklapptes, an zwei Heberollständer gelagertes Trampolin.

Figur 2:

Einzeldarstellung eines Heberollständers.

Figur 3:

Aufbau einer Hydraulikeinheit für den Heberollständer gemäß Figur 2.

The invention will be explained below with reference to the drawings. Show it:

FIG. 1:

Top view of a folded trampoline mounted on two lifting racks.

FIG. 2:

Individual representation of a lifting roller stand.

FIG. 3:

Construction of a hydraulic unit for the lift stand according to FIG. 2 ,

FIG. 1 shows a plan view of a collapsed trampoline 1, which is mounted on two lifting roller stands 2. The trampoline 1 has a hinged frame so that it can be used after use, as in FIG. 1 shown, can be folded so that the components of the trampoline 1 are oriented in a substantially vertical plane. In this case, the trampoline 1 is mounted on opposite sides in each case on a Heberollständer 2, wherein these are formed identically. The Heberollständer 2 form a height-adjustable, mobile storage for the trampoline. 1

FIG. 2 shows an individual view of a lifting roller stand 2.

The lifting roll stand 2 has a post part, which has a metallic, tubular support 3 running in the horizontal direction. At the longitudinal ends of the carrier 3, a roller 5 is mounted in each case by means of a rotary bearing 4. The rollers 5 rest on a support. By these rollers 5, the Heberollständer 2 is movably mounted on the support. As a further part of the Ständerils a firmly connected to the carrier 3, a guide forming metallic outer tube 6 is provided. The outer tube 6 is seated in the center of the carrier 3 on its upper side. The longitudinal axis of the outer tube 6 extends in the vertical direction. The outer tube 6 has an oval, in particular elliptical cross-section and is open at its top.

In the outer tube 6, a guide element is slidably mounted. The guide element consists of an inner tube 7, which also has an oval, preferably elliptical cross-section. The outer dimensions of the guide element are adapted to the inner diameter of the guide so that the guide element is guided with little play in the guide. The upper Part of the guide tube forming inner tube 7 protrudes beyond the top of the outer tube 6 forming the guide. Since the outer tube 6 and the inner tube 7 have a non-rotationally symmetrical, oval cross-section, the inner tube 7 is mounted against rotation in the outer tube 6, that is, it can not be rotated in the outer tube 6, but only moved in the vertical direction.

At the upper edge of the guide member is an adapter 8 for fixing the trampoline 1. The adapter 8 consists of a circular cylindrical metal part whose longitudinal axis extends in the horizontal direction, and which protrudes perpendicularly from a side surface of the tube 7. For coupling the lifting roller stand 2 to the trampoline 1, this adapter 8 is inserted into a hollow cylindrical receptacle on the trampoline 1.

How out FIG. 1 can be seen, at the top of the inner tube 7, a first headband 9 is hinged. At the bottom of the outer tube 6, a second bracket 10 is hinged. With these brackets 9, 10, the folded trampoline 1 is secured in position, that is secured against unwanted unfolding.

For actuating the lifting roller stand 2, that is, for the height adjustment, an actuating element in the form of a foot lever 11 is provided.

The foot lever 11 is pivotally mounted in the lower region of the outer tube 6, so that an operator can operate the foot lever 11 comfortably with one foot.

FIG. 1 shows the pedal 11 in a parking position in which it is folded up and tight against the outer tube 6 of the lifting roller stand 2. FIG. 2 shows the pedal 11 in different pivot positions.

By pivoting the foot lever 11, a hydraulic unit 12 is actuated within the lifting roller stand 1. By the hydraulic unit, the inner tube 7 is moved out of the outer tube 6 and retracted into this. In addition, only by the hydraulic unit 12, the inner tube 7 is held securely in a set with the pedal lever 11 height position there.

In FIG. 2 is the parking position of the foot lever 11, in which it rests tightly against the outer tube 6, designated I.

In order to perform a height adjustment, the foot lever 11 is folded manually or with the foot from the parking position I to the basic position designated II. This folding movement can be exercised without a resistance acting through the hydraulic unit 12.

In order to drive the inner tube 7 out of the outer tube 6, the hydraulic unit 12 is actuated in that the pedal 11 is repeatedly moved between the basic position II and an end position III back and forth by the operator presses several times with his foot on the pedal 11. The pump stroke between the basic position II and the end position III is marked with the double arrow marked P. If the operator has extended the inner tube 7 to the desired position, it folds the foot lever 11 back into the parking position. Then, the inner tube 7 is held securely alone by the hydraulic unit 12 in its desired position. However, if the operator wishes to retract the inner tube 7 into the outer tube 6, the foot lever 11 is pivoted with the foot beyond a resilient pressure point beyond the end position III into a lowered position IV. If the inner tube 7 retracted into the desired position in the outer tube 6, the pedal 11 is folded back into the parking position I back.

FIG. 3 shows the structure of the hydraulic unit 12 for the lifting roll stand 2 according to the FIGS. 1 and 2 , The hydraulic unit 12 has a piston rod 13 which can be retracted and extended from a pressure tube 14. At the upper end the piston rod 13 is a first attachment eye 15, to which the inner tube 7 is coupled. The lower end of the pressure tube 14 is mounted in a pipe section 16. At the lower end of the pipe section 16 is a second fastening eye 17 for coupling to the outer tube. 6

The foot lever 11 is mounted at a bearing point 18 on a tab 19 in the region of the pipe section 16. At the front end of the foot lever 11 is a roller tappet 20, which adjoins the lower end of a pump rod 21 which is mounted in a guide bush 24 in the longitudinal direction displaceable. The upper end of the pump rod 21 protrudes into a pump oil chamber 22. The pump rod 21 is associated with a return spring 23 mounted between two stops.

To guide the piston rod 13, a guide bushing 24 and a guide piston 25 are provided. The guide piston 25 is guided in an inner cylinder 26. In this, a slider 27 is slidably mounted against the restoring force of a spring 28 located on a stop 28. The space between the inner cylinder 26 and pressure tube 14 forms an oil compensation chamber 30. A cavity in the interior of the inner cylinder forms an oil pressure chamber 31st

The operation of the hydraulic unit 12 is such that when the foot lever 11 is actuated between the basic position II and the end position III, pressure is exerted on oil accumulated in the pump oil chamber 22, since the pump rod 21 is pressed into the pump oil chamber 22 via the roller tappet 20.

By this overpressure, which can be reduced only by a discharge of oil through a non-illustrated check valve from the pump oil chamber 22 into the oil pressure chamber 31, the piston rod 13 is extended upward and thus the inner tube 7 from the outer tube. 6

Upon completion of the pumping operation by means of the foot lever 11, that is, when relieving the foot lever 11, the pump rod 21 is returned by the return spring 23 to its original position. It is about a not shown Check valve oil sucked from the oil compensation chamber, so that the pumping oil chamber 22 is filled again by the extended pump rod volume with oil.

Thus, the position of the piston rod 13 is maintained stable, that is, the piston rod 13 is fixed due to the oil pressure rigidly in its desired position. Furthermore, the pumping process can now be repeated or continued at any time.

If the piston rod 13 is fully extended up to its upper stroke end, upon further actuation of the foot lever 11, the excess oil conveyed by the further pumping is conducted via a bypass into the oil compensation chamber 30.

To lower the inner tube 7 and the piston rod 13 of the pedal 11 is pivoted over a resilient pressure point away in the lowered position IV. As a result, the pump rod 21 presses on the slide 27. This opens a passage so that oil from the oil pressure chamber 31 can flow into the oil compensation chamber 30. Thus, the piston rod 13 can be pushed down, that is, the inner tube 7 moves into the outer tube 6 when a load acts on this.

LIST OF REFERENCE NUMBERS

(1)

trampoline

(2)

Lifting roller stand

(3)

carrier

(4)

pivot bearing

(5)

role

(6)

outer tube

(7)

inner tube

(8th)

adapter

(9)

headband

(10)

headband

(11)

treadle

(12)

hydraulic unit

(13)

piston rod

(14)

pressure pipe

(15)

mounting rod

(16)

pipe section

(17)

fastening eye

(18)

bearing point

(19)

flap

(20)

roller plunger

(21)

sucker rod

(22)

Pumping oil chamber

(23)

Return spring

(24)

guide bush

(25)

guide piston

(26)

inner cylinder

(27)

pusher

(28)

attack

(29)

feather

(30)

Oil expansion space

(31)

Oil-pressure chamber

Claims (10)

1. Lifting roller stand for a trampoline, comprising a stand part, which is mounted on rollers and which comprises a guide in which a guide element fixable to the trampoline is adjustable in height, which element comprises an adapter, wherein the adapter (8) has a circularly cylindrical form, the longitudinal axis of which extends in horizontal direction and opens at the upper end of the guide element, wherein the adapter (8) is insertable into a hollow cylindrical receptacle at the trampoline (1), and wherein the lifting roller stand comprises an actuating element for height adjustment of the guide element, wherein a hydraulic unit (12) is provided as means for the height adjustment, wherein movement in and movement out of the guide element in the guide for carrying out the height adjustment is ensured by this hydraulic unit, wherein a set height position of the guide element in the guide is held solely by the hydraulic unit (12), and wherein the actuating element for actuation of the hydraulic unit (12) is a foot lever (11).
2. Lifting roller stand according to claim 1, characterised in that the foot lever (11) is pivotably mounted at this.
3. Lifting roller stand according to claim 2, characterised in that the guide element can be moved out of the guide by pivoting the foot lever (11) up to a resilient pressure point.
4. Lifting roller stand according to claim 3, characterised in that the guide element is held in a moved-out position solely by the hydraulic unit (12).
5. Lifting roller stand according to one of claims 3 and 4, characterised in that the guide element is movable into the guide by pivotation of the foot lever (11) beyond the resilient pressure point.
6. Lifting roller stand according to any one of claims 2 to 5, characterised in that the foot lever (11) can be brought into a parked setting.
7. Lifting roller stand according to any one of claims 1 to 6, characterised in that the guide is formed by an outer tube (6) in which an inner tube (7) forming the guide element is guided to be secured against turning.
8. Lifting roller stand according to claim 7, characterised in that the longitudinal axes of the outer tube (6) and the inner tube (7) extend along an axis extending in vertical direction.
9. Lifting roller stand according to any one of claims 1 to 8, characterised in that a respective holding bracket for positional fixing of the trampoline (1) is provided at each of the guide element and the guide.
10. Lifting roller stand according to any one of claims 1 to 9, characterised by a multiple arrangement thereof, wherein two lifting roller stands (2) are fixable to opposite sides of the trampoline (1).

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