JP7152747B2 - Inner mold of formwork for molding concrete products - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies [Place of sale] Hokutetsu Co., Ltd. (445-4 Nishifukushima, Kubiki-ku, Joetsu City, Niigata Prefecture) [Sales date] February 28, 2018, March 31, 2018, April 27, 2018, May 29, 2018, June 29, 2018

TECHNICAL FIELD The present invention relates to an inner mold of a form for molding a concrete product such as a square block.

Conventionally, when manufacturing bottomed concrete products such as square blocks, concrete is filled between the outer mold and the inner mold. There is known a formwork for concrete products in which the product is lifted upward and demolded (see, for example, Patent Document 1).

The inner mold of the concrete product formwork described in Patent Document 1 is divided into five parts: the top plate is the central part, and the first peripheral part, the second peripheral part, the third peripheral part, and the fourth peripheral part surrounding it. The peripheral wall 4 is vertically divided into four parts corresponding to these peripheral parts, and has a first peripheral wall dividing part, a second peripheral wall dividing part, a third peripheral wall dividing part, and a fourth peripheral wall dividing part. there is Then, the first peripheral portion and the first peripheral wall dividing portion are integrated to form a first part, the second peripheral portion and the second peripheral wall dividing portion are integrated to form a second part, and the third peripheral portion and the third peripheral wall dividing portion are integrated. are integrated to form a third part, and the fourth peripheral part and the fourth peripheral wall dividing part are integrated to form a fourth part.

In the formwork for concrete products described in Patent Document 1, in order to reduce the diameter of the inner mold during demolding, the operating shaft of the clamp is rotated to move the central portion of the top plate downward. The first part and the second part move inward and downward in conjunction with the central portion of the top plate. In this case, when the actuating shaft is slightly rotated, the members naturally move after that due to their own weight, but they move slowly due to the action of the urging means. When the concrete product molded in this state is lifted upward, the impact causes the third part and the fourth part to move slightly inward.

JP-A-2008-36973

As described above, in the concrete product formwork of Patent Document 1, when the diameter of the inner mold is reduced, the top plate has a central portion, a first peripheral portion, a second peripheral portion, a third peripheral portion, and a fourth peripheral portion surrounding it. divided into five parts. Therefore, when the diameter of the inner mold is contracted, a gap is generated between the central portion, the first peripheral portion, the second peripheral portion, the third peripheral portion, and the fourth peripheral portion, and concrete fragments fall into the inner mold from this gap. There was a problem that

In addition, the central part, the first part and the second part move downward when the diameter of the inner mold is contracted. In order to move the two parts upward, a large force was required for operation. Therefore, a biasing means (coil spring) is provided to bias the central portion upward. By providing such biasing means, there is a problem that the number of components of the inner die increases and the structure becomes complicated. As a result, the manufacturing cost increases and the repair work becomes complicated.

Furthermore, when the concrete product is removed from the mold, the central part of the inner mold, the first part, the second part, the third part and the fourth part are all moved, so repeated removal of the mold will cause wear of the parts. However, there is a problem that failure is likely to occur.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above problems and to provide an inner mold for a formwork for concrete products which has a simple structure, prevents concrete fragments from entering the interior, and is capable of stepwise reduction in diameter. do.

The inner mold of the concrete product formwork according to the present invention includes a first moving mold part, a second moving mold part, a third moving mold part, a fixed mold part, the first moving mold part, and the second moving mold part. The top plate portion covering the gap between the second moving mold portion, the third moving mold portion, and the fixed mold portion, the lower mold portion, the first moving mold portion, and the second moving mold portion. a first operating part that operates to move, a second operating part that operates to move the third moving mold part, the first moving mold part, the second moving mold part, the third moving mold part, and the fixed mold part a vertically movable elevating section provided inside the first movable die section, the second movable die section, and the third movable die section are horizontally movable, and the elevating section is connected to the first moving mold portion and the second moving mold portion via a link portion, a crank portion connected to the first operation portion is fixed to the lower end portion of the elevating portion, and the crank portion has a rotating plate portion that is rotated by the first operating portion, a swinging portion that is pivotally supported by the rotating plate portion, and a receiving portion that is pivotally supported by the swinging portion; The elevating portion is fixed to the receiving portion, and when the first operating portion is operated in one direction to rotate the rotating plate portion, the swinging portion rotates and the receiving portion moves downward. By moving, the elevating section moves downward, the first moving die section and the second moving die section move inward, and the first operating section is operated in the direction opposite to the one direction. When the rotating plate portion is rotated by the oscillating portion, the swinging portion rotates and the receiving portion moves upward. It is characterized in that the two-moving mold part moves outward.

Moreover, the inner mold of the formwork for concrete products according to the present invention is characterized in that the top plate portion is fixed to the upper end portion of the fixed mold portion.

In the inner mold of the concrete product formwork according to the present invention, the first moving mold part, the second moving mold part, the third moving mold part, and the fixed mold part are placed on a mounting base part, The first movable mold section, the second movable mold section, and the third movable mold section slide on the mounting table.

According to the inner mold of the formwork for concrete products according to the present invention, it is possible to prevent concrete fragments from entering the inner mold when the inner mold is contracted in diameter. In addition, the diameter of the inner mold can be reduced step by step.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front side perspective view of a formwork for concrete products showing Example 1 of the present invention; It is a rear side perspective view of the same, the formwork for concrete products. It is a perspective view which shows the inside of an inner mold equally. It is a perspective view which shows an raising/lowering part equally. It is an upper side perspective view of an inner type|mold equally. It is a perspective view which shows the inner surface of a top-plate part equally. It is an upper side perspective view which shows a lower side type|mold part and a mounting base part equally. It is a bottom view of an inner mold same. It is a lower side perspective view which shows a crank part equally. It is a lower side perspective view which shows a crank part equally. It is an upper side perspective view which shows a crank part equally. It is a front side perspective view of an inner mold same. It is an outside perspective view showing a second operation portion of the same. It is a perspective view which shows the rotating plate part of a 2nd operation part equally. It is an inner perspective view showing a second operation portion of the same.

Embodiments of the present invention will be described below with reference to the accompanying FIGS. 1 to 15. FIG. The examples described below do not limit the content of the claimed invention. Moreover, not all the configurations described below are essential requirements of the present invention.

In FIG. 1, reference numeral 1 denotes a formwork for concrete products, and this formwork 1 for concrete products is composed of an outer mold 2, an inner mold 3, and a base 4 for supporting the outer mold 2 and the inner mold 3. ing. The formwork 1 for concrete products of the present embodiment is for molding a rectangular square block (not shown).

The outer mold 2 can be in a closed state (not shown) for pouring concrete, and an open state (shown in FIG. 1) for demolding a solidified concrete product. The outer mold 2 has a first outer mold part 6, a second outer mold part 7, a third outer mold part 8 and a fourth outer mold part 9 arranged so as to surround the inner mold 3 in a closed state. there is The first outer mold part 6 and the second outer mold part 7 face each other, and the third outer mold part 8 and the fourth outer mold part 9 face each other. The first outer mold part 6 and the second outer mold part 7 are provided so as to be movable in directions approaching and separating from the inner mold 3 . The third outer mold portion 8 and the fourth outer mold portion 9 are rotatably connected to both side portions of the first outer mold portion 6 via hinge portions 10 . In the closed mold state, the third outer mold part 8 and the fourth outer mold part 9 are connected to the first outer mold part 6 .

As shown in FIGS. 1 and 2, the inner mold 3 is in an initial state (state shown in FIG. 1) when concrete is poured, and in a diameter-reduced state (FIGS. 2 and 5) when the solidified concrete product is removed from the mold. and the state shown in FIG. 12). The inner mold 3 has a first movable mold portion 11, a second movable mold portion 12, a third movable mold portion 13, a fixed mold portion 14, a top plate portion 15, and a lower mold portion 16. .

The first moving mold part 11, the second moving mold part 12, the third moving mold part 13, and the fixed mold part 14 are the first corner part 17, the second corner part 18, the third triangular part 19, and the third part of the inner mold 3, respectively. It has a square portion 20 . The first moving die part 11 and the second moving die part 12 are formed in the same shape, and the third moving die part 13 and the fixed die part 14 are formed in the same shape. The first moving die part 11 and the second moving die part 12 face each other, and the third moving die part 13 and the fixed die part 14 face each other. The first movable mold part 11 and the second movable mold part 12 are formed smaller than the third movable mold part 13 and the fixed mold part 14 .

In the initial state, the inner mold 3 includes a first movable mold portion 11 and a second movable mold portion 12, a second movable mold portion 12 and a third movable mold portion 13, a third movable mold portion 13 and a fixed mold portion 14, The fixed mold part 14 and the first movable mold part 11 are in contact with each other without a gap, and the outer surface 21 of the first movable mold part 11 and the outer surface 22 of the second movable mold part 12 are arranged. The outer surface 23, the outer surface 23 of the fixed mold portion 14 and the outer surface 24, the outer surface 24, and the outer surface 21 of the fixed mold portion 14 are flush with each other.

Upper portions 25, 26, 27, and 28 of outer side surfaces 21, 22, 23, and 24 of the first moving mold portion 11, the second moving mold portion 12, the third moving mold portion 13, and the fixed mold portion 14 are tapered. It is

As shown in FIG. 3 , a stopper 29 is provided on the inner upper portion of the first movable mold portion 11 . The stopper 29 is formed in a substantially L-shaped plate shape. The stopper 29 is formed with an engaging portion 30 that engages with the inner portions of the third moving mold portion 13 and the fixed mold portion 14 to restrict the outward movement of the first moving mold portion 11 . The second moving mold portion 12 is similarly provided with a stopper 31. The stopper 31 engages with the inner portions of the third moving mold portion 13 and the fixed mold portion 14 to prevent the second moving mold portion 12 from moving outward. A locking portion 32 is formed to restrict movement.

As shown in FIGS. 3 and 4, the inner portion of the third movable mold portion 13 is provided with lateral displacement prevention portions 33 for the lifting portion 101, which will be described later, at two upper and lower positions. The lateral displacement prevention portion 33 has a concave portion 34 formed in a concave shape. In addition, lateral displacement prevention portions 35 are also provided at two upper and lower portions in the inner portion of the fixed mold portion 14, and have concave portions 36 formed in a concave shape.

The top plate portion 15 arranged above the first movable mold portion 11, the second movable mold portion 12, the third movable mold portion 13, and the fixed mold portion 14 is, as shown in FIGS. It is formed in a substantially square plate shape. A positioning portion 52 is provided at the central portion of the inner surface 51 of the top plate portion 15 . Positioning of the top plate portion 15 can be performed by arranging the top portion 103 of the lifting portion 101 to be described later on the positioning portion 52 . In addition, a positioning pin 53 for positioning the third movable die section 13 is provided on the inner side surface 51 of the top plate section 15 . Also, the top plate portion 15 is provided with three bolt insertion holes 55 through which bolts 54 for fixing the top plate portion 15 to the fixed mold portion 14 are inserted. A peripheral edge portion 57 of the outer side surface 56 of the top plate portion 15 is formed in a tapered shape. When the inner mold 3 is in the initial state, the top plate portion 15 , the first movable mold portion 11 , the second movable mold portion 12 , the third movable mold portion 13 and the fixed mold portion 14 are in contact with each other without gaps, and the peripheral edge portion 57 The upper portions 25, 26, 27, 28 are flush.

As shown in FIG. 3 , a positioning hole 38 through which a positioning pin 53 is inserted is formed in the upper end portion 37 of the third moving die portion 13 . The positioning hole 38 is an elongated hole, and the positioning pin 53 moves within the positioning hole 38 as the third movable mold portion 13 moves. Three bolt insertion holes 40 through which bolts 54 are inserted are formed in the upper end portion 39 of the fixed mold portion 14 . The bolt 54 is inserted through the bolt insertion hole 55 and the bolt insertion hole 40 from the outer surface 56 side of the top plate portion 15 and screwed with a nut (not shown) below the upper end portion 39 of the fixed mold portion 14 . Then, the top plate portion 15 is fixed to the fixed mold portion 14 . At this time, the positioning pin 53 is inserted through the positioning hole 38 of the third movable mold portion 13 .

As shown in FIG. 7, the lower mold portion 16 has a substantially square outer shape in plan view, and a substantially square opening 61 is formed in the central portion. The upper surface 62 of the lower mold portion 16 is formed flat. The lower mold part 16 is fixed while being placed on the base 4 .

The first movable mold portion 11 , the second movable mold portion 12 , the third movable mold portion 13 and the fixed mold portion 14 are mounted on a mounting table portion 71 fixed to the lower mold portion 16 . As shown in FIGS. 7 and 8, the mounting table portion 71 includes a first mounting table portion 72, a second mounting table portion 73, a third mounting table portion 74, a fourth mounting table portion 75, and a first mounting table portion 75. It has a sliding stage portion 76 and a second sliding stage portion 77 . The first mounting table portion 72, the second mounting table portion 73, the third mounting table portion 74, and the fourth mounting table portion 75 are formed by bending a plate-like member substantially at a right angle. , 81 and depending portions 82 , 83 , 84 , 85 . The first sliding mounting base portion 76 and the second sliding mounting base portion 77 are formed in a plate shape.

The first mounting base portion 72 is fixed to the first inner wall portion 63 and the second inner wall portion 64 (see FIG. 15) of the lower mold portion 16 , and the second mounting base portion 73 is fixed to the lower mold portion 16 . It is fixed to the third inner wall portion 65 and the fourth inner wall portion 66 . The third mounting table portion 74 and the fourth mounting table portion 75 are provided across the first mounting table portion 72 and the second mounting table portion 73 . A first mounting base portion 72 and a second mounting base portion 73 are arranged in parallel, and a third mounting base portion 74 and a fourth mounting base portion 75 are arranged in parallel. As shown in FIG. 7, the first sliding table portion 76 is fixed to the connection portion 86 between the first inner wall portion 63 and the fourth inner wall portion 66 and the third mounting table portion 74. The portion 67 is fixed to a connecting portion 87 between the second inner wall portion 64 and the third inner wall portion 65 and the fourth mounting base portion 75 .

As shown in FIG. 1, the first movable mold portion 11, the second movable mold portion 12, the third movable mold portion 13, and the fixed mold portion 14 are arranged in the opening portion 61 of the lower mold portion 16. , when the inner mold 3 is in the initial state, the outer surfaces 21 , 22 , 23 , 24 of the first movable mold part 11 , the second movable mold part 12 , the third movable mold part 13 and the fixed mold part 14 are formed into openings 61 . abuts the inner end 67 of the .

As shown in FIG. 4 and the like, the first movable mold part 11 is mounted on the first sliding mounting base part 76, the second movable mold part 12 is mounted on the second sliding mounting base part 77, and the third movable mold part 12 is mounted on the second sliding mounting base part 77. The movable mold section 13 is mounted on the first mounting base section 72, the third mounting base section 74 and the fourth mounting base section 75, and the fixed mold section 14 is mounted on the second mounting base section 73, the third mounting base section 74 and the fourth mounting base section 74. It is mounted on the fourth mounting table portion 75 . Therefore, the first moving die part 11 slides on the first sliding stage part 76, the second moving die part 12 slides on the second sliding stage part 77, and the third moving die part 13 slides. slides on the upper plate portions 78 , 80 , 81 of the first mounting table portion 72 , the third mounting table portion 74 and the fourth mounting table portion 75 . The widths of the first sliding stage portion 76 and the second sliding stage portion 77 are formed narrower than the widths of the first moving die portion 11 and the second moving die portion 12, and the first moving die portion Frictional resistance between the portion 11 and the second moving mold portion 12 is reduced to facilitate sliding.

As shown in FIG. 8 , the bottom surface portion 41 of the first movable mold portion 11 is provided with two movement restricting portions 42 , and the movement restricting portions 42 are attached to the hanging portion 84 of the third mounting table portion 74 . This abutment restricts the movement of the first movable mold portion 11 in the diameter-reducing direction of the inner mold 3 by a predetermined amount or more.

Two movement restricting portions 44 are provided on the bottom surface portion 43 of the second movable mold portion 12. When the movement restricting portions 44 come into contact with the hanging portion 85 of the fourth mounting table portion 75, It restricts the movement of the second movable mold part 12 in the diameter-reducing direction of the inner mold 3 by a predetermined amount or more.

Two movement restricting portions 46 are provided on the bottom surface portion 45 of the third moving mold portion 13. When the movement restricting portions 46 come into contact with the drooping portion 82 of the first mounting table portion 72, It restricts the movement of the third moving mold part 13 in the diameter-reducing direction of the inner mold 3 by a predetermined amount or more. A portion of the movement restricting portion 46 is arranged below the upper plate portion 78 of the first mounting table portion 72 , and the upper plate portion 78 is arranged between the third moving mold portion 13 and the movement restricting portion 46 . ing. Therefore, the movement restricting portion 46 also has a function of preventing the third moving mold portion 13 from falling.

Further, two movement restricting portions 48 are provided on the bottom portion 47 of the fixed mold portion 14 . The movement restricting portion 48 is arranged below the upper plate portion 79 of the second mounting table portion 73 , and the upper plate portion 79 is arranged between the fixed mold portion 14 and the movement restricting portion 48 . Therefore, the movement restricting portion 48 prevents the fixed die portion 14 from collapsing. When the fixed mold portion 14 is in contact with the inner end portion 67 of the opening portion 61 , the movement restricting portion 48 and the hanging portion 83 of the second mounting table portion 73 are slightly separated. Since the fixed mold portion 14 is not fixed to the mounting table portion 71 , when the fixed mold portion 14 moves inward, the movement restricting portion 48 comes into contact with the drooping portion 83 to restrict the movement of the fixed mold portion 14 . It's becoming The fixed mold portion 14 slides slightly in the horizontal direction on the upper plate portions 79 , 80 , 81 of the second mounting table portion 73 , the third mounting table portion 74 and the fourth mounting table portion 75 .

An operating section support section 88 that supports a first operating section 91 described later is fixed to the hanging section 84 of the third mounting table section 74 and the hanging section 85 of the fourth mounting table section 75 . An insertion hole 89 is formed in the operation portion support portion 88, and an operation rod portion 92 of the first operation portion 91 is inserted through the insertion hole 89 and rotatably supported.

As shown in FIG. 8 , a first operating portion 91 for moving and operating the first moving die portion 11 and the second moving die portion 12 includes an operating rod portion 92 formed in a long cylindrical shape and two ends of the operating rod portion 92 . It is composed of operating body engaging portions 93 and 94 which are formed in a short cylindrical shape. Insertion holes 95 and 96 into which the operating body 5 (see FIG. 12) such as a metal rod can be inserted are formed in the operating body locking portions 93 and 94 . The insertion hole 95 extends perpendicularly to the longitudinal direction of the operation rod portion 92. By inserting the operation body 5 into the insertion hole 95 and tilting the operation body 5, the first operation portion 91 can be rotated. can be operated dynamically.

The operation body 5 is formed so that the distal end side is thinner than the gripping side. Also, the openings on one side of the insertion holes 95 and 96 are formed smaller than the openings on the other side. Since the diameter of the opening on one side of the insertion holes 95 and 96 is smaller than the diameter on the distal end side of the operation body 5, the operation body 5 can be moved from the distal end side to the opening on the other side of the insertion holes 95 and 96. , the operating body 5 does not fall off from the operating body engaging portions 93 and 94. As shown in FIG.

Both ends of the operating rod portion 92 protrude outside the base 4 through an opening 97 (see FIG. 8) and an opening 98 (see FIG. 15) formed in the base 4. Positioned outside the first corner 17 , the operating body locking portion 94 is positioned outside the second corner 18 . The first operating portion 91 can be rotated by operating either the operating body locking portion 93 or the operating body locking portion 94 .

As shown in FIG. 4, inside the inner mold 3 surrounded by the first movable mold part 11, the second movable mold part 12, the third movable mold part 13 and the fixed mold part 14, there is a vertically movable A lifting unit 101 is provided. The elevating unit 101 includes an elevating main body portion 102 having a rectangular tubular shape, a top portion 103 formed in a truncated cone shape provided at the upper portion of the elevating main body portion 102, and a male screw portion 104 provided at the lower portion of the elevating main body portion 102. consists of

The elevating main body 102 is connected to the first movable mold part 11 via link parts 105 at two upper and lower positions. In addition, the elevating body portion 102 is connected to the second moving die portion 12 via link portions 106 at two upper and lower positions. The link parts 105 and 106 are rotatable with respect to the first moving die part 11 , the second moving die part 12 and the elevating body part 102 .

The elevating body portion 102 is arranged inside the concave portion 34 formed in the side slip prevention portion 33 of the third movable mold portion 13 and the concave portion 36 formed in the side slip prevention portion 35 of the fixed mold portion 14 . A retaining portion 49 is fixed to the recess 36 to close the opening of the recess 36 . Therefore, although the lifting unit 101 can move in the vertical direction, it is restricted from moving in the horizontal direction.

A crank portion 111 is attached to the male screw portion 104 of the lifting portion 101 . As mainly shown in FIGS. 9 to 11, the crank portion 111 includes a pair of rotating plate portions 112 to which the operating rod portion 92 of the first operating portion 91 is fixed, and a lower shaft 113 attached to the rotating plate portions 112. and a receiving portion 116 rotatably supported on the swinging portion 114 by an upper shaft 115 .

The rotating plate portion 112 is formed in the shape of an oval plate, and the operating rod portion 92 is inserted and fixed to one side thereof, and the lower shaft 113 is rotatably inserted to the other side thereof. In this embodiment, a pair of rotating plate portions 112 are provided facing each other. The rotating plate portion 112 is provided with a range defining portion 117 that defines a rotating range of the first operation portion 91 in one side direction.

The oscillating portion 114 has a pair of side plate portions 118 formed in a substantially U-shaped plate shape, and a rear plate portion 119 and a connection tube portion 120 that connect the pair of side plate portions 118 . The lower shaft 113 is inserted through one side (lower side) of the side plate portion 118, and the upper shaft 115 is inserted through the other side (upper side). The lower shaft 113 is also inserted through the connecting tube portion 120 . The pair of side plate portions 118 are arranged between the pair of rotating plate portions 112 .

The receiving portion 116 has a substantially rectangular parallelepiped shape. Upper shafts 115 project from both side surfaces 121 of the receiving portion 116 . It also has a through hole 122 (see FIG. 7) extending in a direction perpendicular to the axial direction of the upper shaft 115 , and the male screw portion 104 of the elevating portion 101 is inserted through the through hole 122 . Nuts 123 are screwed onto the male screw portion 104 above and below the receiving portion 116 , and the crank portion 111 is fixed to the lifting portion 101 .

Here, a method of operating the first moving die part 11 and the second moving die part 12 by the first operating part 91 will be described. First, when the inner die 3 is in its initial state, that is, when the first moving die portion 11 and the second moving die portion 12 are in contact with the inner end portion 67 of the lower die portion 16, the operating body 5 is locked. By inserting it into the insertion hole 95 of the portion 93 and raising the operation body 5, the first operation portion 91 is rotated in the direction of the arrow A1 of the display portion 124 provided on the base 4 (see FIG. 12). Then, the pair of rotating plate portions 112 rotate in the direction of arrow A2 (see FIG. 9). As the rotating plate portion 112 rotates, the swinging portion 114 rotates about the upper shaft 115 in the direction of the arrow A3 (see FIG. 9). At this time, the lifting unit 101 is pulled downward and descends. As the elevating section 101 moves downward, the first moving die section 11 and the second moving die section 12 are pulled toward the inside of the inner die 3 via the link sections 105 and 106, and the first moving die section 11 and The second movable mold portion 12 slides on the first sliding mounting base portion 76 and the second sliding mounting base portion 77 . When the operating body locking portion 93 is further rotated in the direction of arrow A1 and the swinging portion 114 is rotated in the direction of arrow A3, the movement restricting portion 42 is moved to the hanging portion 84 of the third mounting base portion 74. Along with the abutment, the movement restricting portion 44 abuts on the hanging portion 85 of the third mounting table portion 75 to restrict the lifting portion 101 from descending any further. Therefore, the movement range of the first moving mold part 11 and the second moving mold part 12 in the inward direction is up to the position where the movement restricting parts 42 and 44 come into contact with the drooping parts 84 and 85 .

In order to return the first moving die part 11 and the second moving die part 12 to their initial states, the operating body 5 inserted into the insertion hole 95 is tilted and the first operating part 91 is rotated in the direction opposite to the arrow A1. Then, the pair of rotating plate portions 112 rotate in the direction opposite to arrow A2. As the rotating plate portion 112 rotates, the swinging portion 114 rotates around the upper shaft 115 in the direction opposite to the arrow A3. At this time, the elevating unit 101 is lifted upward. As the elevating section 101 moves upward, the first moving die section 11 and the second moving die section 12 are pushed outward of the inner die 3 via the link sections 105 and 106, and the first moving die section 11 and the second moving die section 12 are pushed outward. The second movable mold portion 12 slides on the first sliding mounting base portion 76 and the second sliding mounting base portion 77 . When the first operating portion 91 is further rotated in the direction opposite to the arrow A1 and the swinging portion 114 is further rotated in the direction opposite to the arrow A3, the locking portions 30, 32 of the stoppers 29, 31 are moved to the third position. The inner portions of the movable mold portion 13 and the fixed mold portion 14 are brought into contact with each other, and the first movable mold portion 11 and the second movable mold portion 12 are brought into contact with the inner end portion 67 of the lower mold portion 16 to form the first movable mold portion. 11 and the second moving mold part 12 stop. The rotatable range of the first operation portion 91 is approximately 90°.

Here, the method of inserting the operating body 5 into the operating body locking portion 93 and operating the movement of the first moving die portion 11 and the second moving die portion 12 has been described, but the operating body locking portion 94 is not used. It is also possible to move the first moving die part 11 and the second moving die part 12 by rotating the first operation part 91 by pressing.

In this embodiment, the insertion hole 95 of the operating body locking portion 93 is opened horizontally when the inner die 3 is in the initial state, and the operating body locking portion 93 is opened vertically when the diameter is reduced. is provided on the operating rod portion 92 . This is because it takes more force to raise the lifting unit 101 than to lower it, and it is easier to apply force to tilt the operation body 5 than to stand it up. The operation body 5 is erected at first, and tilted when the elevating unit 101 is raised. However, since ease of operation differs depending on the dominant hand of the operator, etc., the direction in which the operating body locking portions 93 and 94 are attached is not particularly limited.

As shown in FIGS. 13 to 15, a second operating portion 131 for moving and operating the third moving die portion 13 includes an operating rod portion 132 formed in a cylindrical shape and an operating rod portion 132 provided at one end of the cylindrical portion. a pair of rotary plate portions 134 formed in the shape of an oval plate; a rotary shaft 135 inserted through the pair of rotary plate portions 134; 136 and an operating rod connecting portion 137 that connects the connecting rod portion 136 to the third moving mold portion 13 .

An insertion hole 138 into which the operating body 5 can be inserted is formed in the operating body locking portion 133 . The insertion hole 138 extends in a direction perpendicular to the longitudinal direction of the operation rod portion 132. By inserting the operation body 5 into the insertion hole 138 and tilting the operation body 5, the operation rod portion 132 can be operated. The body engaging portion 133 and the pair of rotating plate portions 134 can be rotated.

The operating rod portion 132 is arranged between an upper hole (not shown) formed in the pair of rotating plate portions 134 and the pair of rotating plate portions 134, and is fixed to the outer side surface portion 139 of the base 4. It is inserted through a support hole (not shown) formed in the shaft support portion 140 . The operating rod portion 132 is fixed to a pair of rotating plate portions 134, but is rotatable with respect to the shaft support portion 140. Therefore, when the operating body 5 is raised and lowered to rotate the operating rod portion 132, , a pair of rotating plate portions 134 are configured to rotate around the operating rod portion 132 .

The rotating shaft 135 is rotatably inserted through lower holes (not shown) formed in the pair of rotating plate portions 134 . Further, the rotating shaft 135 is inserted through a shaft insertion hole (not shown) formed in the shaft connecting portion 141 of the connecting rod portion 136 . The shaft connecting portion 141 is arranged between the pair of rotating plate portions 134 .

The connecting rod portion 136 protrudes outward from an opening 143 formed in the base 4 on the side of the shaft connecting portion 141 , and an operating rod connecting portion 137 formed on the opposite side of the shaft connecting portion 141 extends inside the base 4 . is connected to the bottom surface portion 45 of the third moving mold portion 13 at the .

Here, a method of operating the third movable die section 13 by the second operating section 131 will be described. First, when the inner mold 3 is in the initial state, that is, when the third moving mold portion 13 is in contact with the inner end portion 67 of the lower mold portion 16, the operating body 5 is inserted into the insertion hole 138 of the operating body locking portion 133. By inserting and tilting the operation body 5, the operation rod portion 132 and the operation body locking portion 133 are rotated in the direction of the arrow B1 of the display portion 143 provided on the base 4 (see FIG. 12). Then, the pair of rotating plate portions 134 rotate about the operating rod portion 132 in the direction of the arrow B2 (see FIG. 14). As the rotating plate portion 134 rotates, the connecting rod portion 136 moves in the direction of the arrow B3 (see FIGS. 14 and 15) and pushes the operating rod connecting portion 137, thereby connecting to the operating rod connecting portion 137. The third moving mold part 13 moves in the diameter contracting direction of the inner mold 3 . The third moving mold portion 13 stops when the movement restricting portion 46 comes into contact with the drooping portion 82 . Therefore, the movement range of the third movable die portion 13 in the inward direction is up to the position where the movement restricting portion 46 comes into contact with the drooping portion 2 .

In order to return the third movable mold portion 13 to the initial state, the operating body 5 inserted into the insertion hole 138 is raised, and the operating rod portion 132 and the operating body locking portion 133 are rotated in the direction opposite to the arrow B1. . Then, the pair of rotating plate portions 134 rotate about the operating rod portion 132 in the direction opposite to the arrow B2. As the rotating plate portion 134 rotates, the connecting rod portion 136 moves in the direction opposite to the arrow B3, and the operating rod connecting portion 137 is pulled, thereby moving the third moving mold portion connected to the operating rod connecting portion 137. 13 moves outward and abuts against the inner end portion 67 of the lower mold portion 16 and stops. The rotatable range of the operating rod portion 132 and the operating body locking portion 133 is approximately 90°.

In this embodiment, the insertion hole 138 of the operating body locking portion 133 is opened vertically when the inner die 3 is in the initial state, and the operating body locking portion 133 is opened horizontally when the diameter is reduced. is provided on the operating rod portion 132 . However, considering the operator's dominant hand and operability, the operation body locking portion 133 can be attached in a desired direction.

One side opening of the insertion hole 138 is formed smaller than the other side opening. Since the diameter of the opening on one side of the insertion hole 138 is formed to be smaller than the diameter on the distal end side of the operation body 5, when the operation body 5 is inserted from the distal end side into the opening on the other side of the insertion hole 138, The operating body 5 is prevented from slipping out of the operating body locking portion 132 .

In order to manufacture a concrete product using the concrete product formwork 1 of this embodiment, the outer mold 2 is brought into a closed state and the inner mold 3 is brought into an initial state. Concrete is poured between the outer mold 2 and the inner mold 3 and solidified. When the concrete is completely solidified, the outer mold 2 is opened, and the first operation part 91 is operated to move the first moving mold part 11 and the second moving mold part 12 inward, and the second operation part 131 is operated to move the third moving die portion 13 inward, and the inner die 3 is brought into a diameter-reduced state. When the inner mold 3 is reduced in diameter, a gap is generated between the first moving mold part 11, the second moving mold part 12, and the third moving mold part 13 and the solidified concrete product, and the concrete product is separated from the inner mold 3. Easier to demold. Then, the solidified concrete product is lifted upward and removed from the mold.

When demolding a concrete product, it is usually possible to demold the concrete product simply by moving only the first moving mold part 11 and the second moving mold part 12 inward. Therefore, when it is difficult to release the mold, the second operation part 131 is operated to move the third moving mold part 13 inward. Further, in the present embodiment, a structure for moving the fixed mold part 14 is not provided, but when an external force is directly applied to the fixed mold part 14, it is possible to move it slightly. Therefore, when the concrete product is demolded, the fixed mold portion 14 moves slightly inward, making demolding easier. In order to return the fixed mold part 14 to the initial state, the first operation part 91 is operated to set the first movable mold part 11 and the second movable mold part 12 to the initial state, whereby the fixed mold part 14 is moved to the first position. It is pushed outward by the mold part 11 and the second moving mold part 12 and comes into contact with the inner end part 67 to stop.

When a concrete product is removed from the mold, concrete fragments may fall. 12. Since the upper parts of the third moving mold part 13 and the fixed mold part 14 are covered, it is difficult for concrete fragments to enter the inside of the inner mold 3. After demolding of one concrete product is completed, concrete products can be continuously manufactured in the same procedure.

As described above, the inner mold 3 of the concrete product formwork 1 of the present embodiment includes the first moving mold part 11, the second moving mold part 12, the third moving mold part 13, and the fixed mold part 14. , the top plate portion 15 arranged above the first moving mold portion 11, the second moving mold portion 12, the third moving mold portion 13 and the fixed mold portion 14, the lower mold portion 16, and the first moving mold By moving the portion 11, the second moving mold portion 12, and the third moving mold portion 13 in the horizontal direction, the inner mold 3 is brought into a diameter-reduced state. Prevents falling and entering inside. In addition, since the first moving die part 11, the second moving die part 12, and the third moving die part 13 move in the horizontal direction, the inner die 3 can be moved in the initial state or in the diameter-reduced state. When moving the first moving mold part 11, the second moving mold part 12 and the third moving mold part 13 without lifting the first moving mold part 11, the second moving mold part 12 and the third moving mold part 13 does not require a great deal of force.

In addition, the inner mold 3 of the concrete product formwork 1 of the present embodiment has a first operation part 91 for moving the first moving mold part 11 and the second moving mold part 12, and a third moving mold part 13. By providing the second operation part 131 to be operated, the first moving mold part 11 and the second moving mold part 12, and the third moving mold part 13 can be moved and operated separately. That is, the diameter of the inner mold 3 can be reduced step by step. Therefore, when the concrete product can be easily demolded, only the first moving mold part 11 and the second moving mold part 12 are moved inward by the first operation part 91 to demold the concrete, which is difficult to demold. When removing the product from the mold, the third moving mold part 13 can also be moved inward by the second operation part 131 to remove the mold.

In addition, the inner mold 3 of the concrete product formwork 1 of the present embodiment has the top plate portion 15 fixed to the upper end portion of the fixed mold portion 14, so that the first movable mold portion 11 and the second movable mold portion 12 and the third moving mold portion 13 are moved to reduce the diameter of the inner mold 3, the top plate portion 15 is moved to the first moving mold portion 11, the second moving mold portion 12, and the third moving mold portion 12. Since the gap between the movable mold part 13 and the fixed mold part 14 is covered from above, it is possible to prevent concrete fragments from falling and entering the gap.

In the inner mold 3 of the formwork 1 for concrete products of this embodiment, the first movable mold portion 11, the second movable mold portion 12, the third movable mold portion 13 and the fixed mold portion 14 are mounted on the mounting table portion 71. By sliding the first moving die part 11, the second moving die part 12 and the third moving die part 13 on the mounting table part 71, the first moving die part 11, the second moving die part 12 and the Since the third moving mold part 13 is supported by the mounting table part 71 when moving, it does not move in the vertical direction, so the first moving mold part 11, the second moving mold part 12 and the third moving mold part 13 are moved. does not require much force to do so.

In addition, the inner mold 3 of the concrete product formwork 1 of the present embodiment can move up and down inside the first movable mold portion 11, the second movable mold portion 12, the third movable mold portion 13, and the fixed mold portion 14. The lifting part 101 is connected to the first moving mold part 11 and the second moving mold part 12 via the link parts 105 and 106, and the first operation part 91 Since the crank portion 111 connected to is fixed, the first moving die portion 11 and the second moving die portion 12 can be moved in the horizontal direction by moving the lifting portion 101 up and down.

In the inner mold 3 of the concrete product formwork 1 of this embodiment, the crank portion 111 is pivotally supported by the rotary plate portion 112 rotated by the first operation portion 91 and the rotary plate portion 112. A swinging portion 114 and a receiving portion 116 pivotally supported by the swinging portion 114 are provided. rotates, and the receiving portion 116 moves up and down, thereby moving the raising/lowering portion 101 up and down. Thus, the lifting unit 101 can be moved up and down.

It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, the sizes of the outer and inner molds are appropriately changed according to the size of the concrete product to be manufactured. In addition, the external shape of the outer and inner molds may be changed in order to manufacture a cylindrical concrete product or a polygonal cylindrical concrete product other than a square.

1 Concrete Product Formwork 3 Inner Mold 11 First Moving Mold Part 12 Second Moving Mold Part 13 Third Moving Mold Part 14 Fixed Mold Part 15 Top Plate Part 16 Lower Mold Part 71 Placement Table Part 91 First Operation Part 101 Lifting Part 105 Link Part 106 Link Part 111 Crank Part 112 Rotating Plate Part 114 Swinging Part 116 Receiving Part 131 Second Operation Part

Claims (3)

a first moving mold part, a second moving mold part, a third moving mold part, a stationary mold part,
a top plate portion covering a gap between the first movable mold portion, the second movable mold portion, the third movable mold portion, and the fixed mold portion;
a lower mold section;
a first operation unit that operates to move the first moving mold unit and the second moving mold unit;
a second operation part that operates to move the third moving mold part;
a vertically movable elevating unit provided inside the first movable mold unit, the second movable mold unit, the third movable mold unit, and the fixed mold unit;
the first moving mold part, the second moving mold part and the third moving mold part are movable in a horizontal direction;
The elevating section is connected to the first moving die section and the second moving die section via a link section,
A crank portion connected to the first operation portion is fixed to the lower end portion of the elevating portion,
The crank portion includes a rotary plate portion that is rotated by the first operation portion, a swing portion that is pivotally supported by the rotary plate portion, and a receiving portion that is pivotally supported by the swing portion. have
The elevating section is fixed to the receiving section,
When the rotating plate portion is rotated by operating the first operating portion in one direction, the swinging portion rotates, the receiving portion moves downward, and the lifting portion moves downward. so that the first moving mold part and the second moving mold part move inward,
When the rotating plate portion is rotated by operating the first operating portion in the direction opposite to the one direction, the swinging portion rotates and the receiving portion moves upward, thereby moving the lifting portion. moves upward, and the first moving mold part and the second moving mold part move outward. 2. The inner mold for a concrete product form according to claim 1, wherein the top plate portion is fixed to the upper end portion of the fixed mold portion. The first movable mold section, the second movable mold section, the third movable mold section and the fixed mold section are placed on a mounting table,
3. The concrete product formwork according to claim 1, wherein said first moving mold part, said second moving mold part and said third moving mold part slide on said mounting table part. type.

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