JP3222267U - Suspension clamp in concrete block - Google Patents

Abstract

An internal suspension clamp suitable for lifting a concrete product used as a road side groove is provided. SOLUTION: A suspension ring 10, a horizontally adjustable shaft 13, a pair of cams 15a, 15b provided at both ends of the shaft so as to be rotatable around cam bolts 14a, 14b, and a suspension ring, respectively. A pair of cam links 12a and 12b respectively connected between a suspension ring bolt 11 provided at the lower end and one end of the cam, and a support plate 23 provided with a long groove 21 through which the suspension ring bolt is movably inserted in a substantially vertical direction. And when the suspension ring is lifted, the pair of cams are protruded outward through the suspension ring bolts and the pair of cam links so as to be pressed against the inner wall surface of the concrete block. Freely rotating rollers 31a and 31b are provided. [Selection] Figure 1

Description

The present invention relates to an internal lifting clamp suitable for lifting concrete products used as roadways.

A concrete product used as a roadside ditch has a bottom portion and a U-shaped groove concrete block (FIG. 9) having a substantially U-shaped cross-sectional shape and a substantially inverted U-shaped cross-sectional shape and an opening on the upper surface And VS side ditch concrete blocks (FIG. 8).

Various types have been developed and put into practical use as inner hanging clamps used for laying work of inner hanging clamps of U-shaped grooved concrete blocks. Also, with regard to the VS side groove concrete block, a large dedicated clamp that is internally suspended using the upper surface opening has been developed.

However, conventionally, it is necessary to use a dedicated clamp for each of the inner suspension of the U-shaped groove block and the inner suspension of the VS side groove block, and a clamp that can also be used for the inner suspension of these blocks has not been developed. For this reason, when both concrete gutter blocks are laid at one site, it is necessary to use two different kinds of dedicated clamps for each, and the working efficiency is bad, which is a big problem in cost. .

Also, especially when trying to suspend the U-shaped groove block inwards, the clamp may not be set at the center of the inner width of the concrete block, but may be set at a position close to the left or right of the inner surface. If so, it may happen that the cam closer to the inner surface of the block contacts the inner surface but the cam farther to the block does not contact the inner surface. If it is lifted in this state, the entire clamp is inclined, and the former cam holds the inner surface at a relatively low position, but the latter cam holds the inner surface at a high position from the bottom surface. The gutter block is lifted in an inclined state, and there is a problem with the safety of the operation.

Therefore, the present invention aims to solve the disadvantages in the prior art and to provide a clamp suitably used for hanging concrete blocks.

That is, in the invention according to claim 1 of the present application, the ring (10), the shaft (13) capable of adjusting the length extending in the horizontal direction, and the cam bolts (14a, 14b) at both ends of the shaft rotate respectively. A pair of cams (15a, 15b) freely provided, a pair of cam links (12a, 12b) respectively connected between a ring bolt (11) provided at the lower end of the ring and one end of the cam, and a ring bolt And a support plate (23) provided with a long groove (21) for movably inserting in a substantially vertical direction, and when lifting the lifting ring, a pair of cams are moved outward via a ring bolt and a pair of cam links In the in-concrete block suspension clamp configured to project and press against the inner wall surface of the concrete block, rollers (each freely rotating below the both ends of the shaft) 1a, 31b), characterized in that is provided.

The invention according to claim 2 of the present application is the suspension clamp in a concrete block according to claim 1, further comprising a pair of slide links (25a, 25b) rotatably connected to the support plate, and lower ends of the slide links. And a shaft (29) for connecting the parts, wherein the roller is rotatably inserted in the outer periphery of the shaft.

According to a third aspect of the present invention, in the in-concrete-block suspension clamp according to the second aspect, a positioning collar (30) having a length shorter than the axial length of the shaft is externally fitted to the shaft. The collar is positioned between the lower end of the slide link to prevent axial movement and to be positioned.

According to the present invention, even if the hanging clamp within the concrete block is not set at the center of the inner width of the concrete block but is set at a position near either the left or right of the inner surface, the protruding cam contacts the inner surface At the same time, the roller works to move the entire clamp in the opposite direction and automatically locate at the center of the inner width. Therefore, the concrete block can be lifted without always tilting, and the safety of work can be ensured.

It is a front view showing the composition of the suspension clamp in a concrete block by one embodiment of the present invention. It is a side view of the clamp. It is an enlarged fragmentary view which shows the state which made the locking metal fitting project outward in the clamp. It is an enlarged fragmentary view which shows the state which made the locking metal fitting the accommodation position in the clamp. It is explanatory drawing which shows the state which is performing the inside suspension of VS side groove block, using the clamp as a protrusion position of FIG. It is explanatory drawing which shows the state which is carrying out the inside suspension of a U-shaped groove block, using the clamp as a storage position of FIG. It is explanatory drawing which shows the connection structure of the shaft of the clamp, and the variation of length adjustment. It is a perspective view which shows VS side groove block. It is a perspective view showing a U-shaped ditch block.

A suspension clamp in a concrete block according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A suspension ring bolt 11 is provided at the lower end of the suspension ring 10, and one end of each of a pair of cam links 12a and 12b is connected to the suspension ring bolt 11. The other end of each of the cam links 12a and 12b is connected to one end of a pair of cams 15a and 15b rotatably supported by cam bolts 14a and 14b at both ends of a length adjustable shaft 13. The suspension ring 10, the suspension ring bolt 11, the cam links 12a and 12b, the shaft 13, the cam bolts 14a and 14b, and the cams 15a and 15b constitute an operating body 16, and the clamp is provided with a pair of operating bodies 16 and 16. As apparent from FIG. 2, the pair of operating members 16, 16 includes a connecting shaft 17 connecting upper ends of the suspension rings 10, 10, a connecting shaft 18 screwing the suspension bolts 11, 11 at both ends, and a cam bolt 14 a, 14b are connected at predetermined intervals by a connecting shaft 19 screwed to each end, and interlocked in synchronization with each other.

In each working body 16, a support member 37 is fixed to the upper surface of the shafts 13a and 13b, and a locking fitting 38 extending in a substantially horizontal direction is slidable in a guide 39 fixed to the upper portion of the support member 37. It is built in. Still referring to FIGS. 3 and 4, the fastener 38 is fixed to the guide 39 by the wing bolt 42, but can freely slide in the lateral direction when the wing bolt 42 is loosened. Can be taken at two positions, the position of FIG. 3 projecting toward the outside (the direction of arrow A) and the position of FIG. 4 stored in the inside of the clamp (the direction of arrow B). Locking grooves 43a and 43b are provided to allow the lower end of the wing bolt 42 to be fitted. In FIG. 1, the pair of fasteners 38, 38 are illustrated as being in the position of FIG. 4 housed inward of the clamp. Further, stoppers 40 and 41 for preventing the guide 39 from falling off are formed at both ends of the locking fitting 38, and a spring 44 for preventing the falling off is incorporated in the butterfly bolt 42.

On the other hand, the support 20 has a support plate 23 having an upper long groove 21 and a lower long groove 22 extending in a substantially vertical direction. The suspension ring bolt 11 passes through the inside of the upper long groove 21 of the support plate 23 and is movable in the substantially vertical direction along the upper long groove 21. The upper ends of the pair of first slide links 25a, 25b are connected to the support plate 23 by the arm bolts 24a, 24b, and are positioned by inserting through insertion holes (not shown) formed below. Further, one end of a pair of second slide links 26a and 26b is connected to a substantially middle portion of the first slide links 25a and 25b. The other end of each of the second slide links 26 a and 26 b is pivotally attached to a slide bolt 27 movable in the lower long groove 22 of the support plate 23. A support 20 comprising the support plate 23, the first slide links 25a and 25b, the second slide links 26a and 26b, the slide bolt 27 and the like is provided, and as is apparent from FIG. It is connected at a predetermined interval by a connecting shaft 29 which connects the lower ends of the connecting shaft 28 and the support plates 23, 23 screwed to both ends, and interlocks in synchronization with each other.

The first slide links 25a, 25b extend further downward beyond the cam bolts 14a, 14b, and rollers 31a, 31b are rotatably attached to lower end portions thereof. More specifically, the lower end portions of the first slide links 25a, 25b are bolted to both ends of the shaft 29, and the rollers 31a, 31b are rotatably inserted in the outer periphery of the shaft 29. Further, a collar 30 having a length shorter than its axial length is externally fitted to the shaft 29, and the rollers 31a and 31b are sandwiched between the first slide links 25a and 25b on both sides of the shaft 29. It is positioned by. As a result, the axial movement of the rollers 31a and 31b is blocked, and the position at which the lower ends of the first slide links 25a and 25b are substantially inscribed is held.

As apparent from the above description, this clamp is composed of a pair of operating members 16 and a support 20, and one end of each of the first slide links 25a and 25b in the support 20 is a cam bolt 14a or 14b in the operating member 16. And the ring bolt 11 serving as the opening and closing fulcrum of the cam links 12a and 12b in the working body 16 is movably accommodated in the upper long groove 21 of the support plate 23 in the support body 20. The body 16 and the support 20 are integrated. The operating body 16 performs a clamp opening and closing operation, and the support 20 stably supports the operating body 16. Further, the entire clamp can be moved in the horizontal direction (width direction) by the rollers 31a and 31b.

1 and 2 show the clamp closed. At this time, the suspension bolt 11 is located near the lower end of the upper long groove 21 of the support plate 23. In this state, the clamp is placed in the U-shaped groove or VS side groove of the concrete product to be lifted.

When the ring 10 is lifted from this state, the ring bolt 11 moves upward along the upper long groove 21 and the pair of cam links 12a and 12b rotate in the direction of closing each other, with which the cams 15a and 15b move. Each of the cam bolts 14a and 14b rotates in the direction in which they are mutually opened. Thus, the cams 15a and 15b are at the positions shown by imaginary lines in FIG. 1, and the engaging teeth W (W) or W '(W) and W' (all will be described later) are formed on the outer periphery of the cams 15a and 15b. Not shown) engage and allow lifting of the concrete product.

In the clamp of the illustrated embodiment, the concrete block is lifted by the clamp and then landed at a predetermined position, whereby the cams 15a and 15b are automatically released when the load acting on the clamp becomes zero. Although the automatic attachment / detachment mechanism 45 is incorporated to improve the efficiency of the operation, it is not directly related to the subject matter of the present invention, and therefore, the description thereof is omitted. The automatic attaching and detaching mechanism 45 is described in detail in Japanese Patent Application No. 10-321422 by the present applicant.

The clamp of the illustrated embodiment can be used for both the inner suspension of the VS side groove block and the inner suspension of the U-shaped groove block. FIG. 5 shows the case where the VS groove block 35 is used for hanging inside, and FIG. 6 shows the case where the U groove block 36 is used for hanging inside. The major difference between the two types of blocks is that the U-shaped groove block 36 has a bottom surface but the VS-side groove block 35 does not have a bottom surface. Therefore, the U-shaped groove block 36 is suspended internally ( 6) can perform the inner suspension work in a stable posture in a state where the clamp is placed on the bottom portion, but in the case of the inner suspension of the VS side groove block 35 (FIG. 5), the clamp is performed inside the VS side groove block 35 It must be placed in the middle in the groove depth direction on the wall surfaces W 'and W' to be suspended inside.

The locking member 38 slidably provided in the guide 39 at the top of the support member 37 in each working body 16 works effectively particularly when the VS-side groove block 35 is internally suspended. In this case, as shown in FIG. 5, the pair of locking metal pieces 38, 38 are fixed to the guide 39 by the butterfly bolt 42 and the locking groove 43b in a state where the pair of locking metal pieces 38, 38 project outward of the clamp (FIG. 3). By mounting the fasteners 38, 38 on the step surfaces S, S facing the opening of the VS side groove block 35, the posture of the clamp can be stabilized, and the inside suspension can be performed in this state. Alternatively, although not shown, the metal fittings 38, 38 may be suspended in the state of being placed on the upper surfaces S ', S' left outside the opening of the VS-side groove block 35.

When the U-shaped groove block 36 is used for hanging inside, as shown in FIG. 6, the pair of locking brackets 38, 38 are housed in the inside of the clamp (FIG. 4) and the butterfly bolt 42 and the locking It fixes to the guide 39 by the groove | channel 43a. In this state, since the fasteners 38 and 38 do not protrude outward of the clamps at all, the clamps are not obstructed when being accommodated and placed in the U-shaped groove block 36.

Furthermore, this clamp can be used universally for lifting concrete products of different internal dimensions (distance between the inner surfaces W, W or W ', W'). This is achieved by the fact that the length of the shaft 13 is made adjustable. In the illustrated embodiment, the shaft 13 has a pair of small diameter shafts 13a and 13b rotatably supporting the cams 15a and 15b at their outer ends via cam bolts 14a and 14b, and the small diameter shafts 13a and 13b, respectively. A large diameter central shaft 13c for accommodating the inward end portion, and one pin insertion hole (not shown) is provided at each inward end portion of the small diameter shafts 13a and 13b. Several pin adjustment holes are provided at each end. Then, the insertion and removal pins 34 are inserted into the pin insertion holes of the small diameter shafts 13a and 13b and the pin adjustment holes of the selected position of the large diameter central shaft 13c to integrally integrate these shafts 13a to 13c. By using pin adjustment holes at different positions in the large diameter central shaft 13c, the accommodation length of the inward end of the small diameter shafts 13a and 13b with respect to this shaft 13c can be adjusted, and the length of the integrated shaft 13 can be increased. Can be adjusted.

For example, when two pin adjustment holes 32a, 32b; 33a, 33b are provided at both ends of the large diameter central shaft 13c, as shown in FIG. 7A, the outer pin adjustment holes 32a, 33a are used. When the small diameter shafts 13a and 13b are connected and when the small diameter shafts are connected using the pin adjustment holes on one side (33a) and the other side (32b) as shown in FIG. 7 (B) Also, as shown in FIG. 7C, it is possible to obtain shafts 13 of three different lengths when the small diameter shafts are connected using the inner pin adjustment holes 32b and 33b.

The shaft 13 is preferably finely adjustable over a wide range, but this can be achieved by providing a large number of adjustment holes at narrow intervals at both ends of the large diameter central shaft 13c or the inward ends of the small diameter shafts 13a, 13b. By providing a plurality of pin adjustment holes also in the part, or by preparing members having a plurality of lengths for the large diameter central shaft 13c, in particular, by using members constituting these shafts, and replacing them appropriately, or It is possible to realize by using these together.

As described above in connection with the prior art, the clamp is not set at the center of the inside width of the concrete block, especially when trying to suspend the U-shaped groove block inwards, but at a position closer to the left or right of the inner surface When lifting in this state, the height of the inner surface held by one cam is different from the height position of the inner surface held by the other cam. Although the clamp according to the illustrated embodiment is provided with freely rotating rollers 31a and 31b, this disadvantage can be eliminated.

If it explains in detail, it can be made available for suspension in concrete block of various inner width by using the shaft 13 which can adjust the length, and if it is set as the embodiment shown in FIG. However, it is difficult to make the length of the shaft 13 correspond exactly to the inner width of the concrete block, although the inner width of the concrete block to be lifted is various. For example, when the length of the shaft 13 in FIG. 7 can be adjusted to 350 mm (A), 300 mm (B) and 250 mm (C), concrete blocks with a width of 305 to 350 mm in the state set in FIG. It will be lifted, and in particular, if it is set in a concrete block of 305 mm width, it will often be set at a position near either the left or the right. If it is attempted to lift in this position, as described above, the concrete block is lifted in an inclined state. However, since the rollers 31a and 31b are provided, one of the cams comes in contact with the inner surface of the nearby block by being set at a position close to one, and at the same time the entire clamp travels and moves toward the other Is automatically set to the inner width center position. Therefore, the concrete block can always be lifted in a stable state without tilting.

The present invention is not limited to the illustrated embodiment described above, but various modifications are possible within the scope of the claims.

DESCRIPTION OF SYMBOLS 10 Suspension ring 11 Suspension ring bolt 12a, 12b Cam link 13 Length adjustable shaft 13a, 13b Small diameter shaft 13c Large diameter shaft 14a, 14b Cam bolt 15a, 15b Cam 16 Operating body 20 Support body 21 Upper long groove 22 Lower long groove 23 Support Plates 24a, 24b Arm bolt 25a, 25b First slide link 26a, 26b Second slide link 27 Slide bolt 31a, 31b Roller 32a, 32b Pin adjustment hole 34 Extraction pin 35 VS side groove block 36 U-shaped groove block 37 Support 38 Fittings 39 Guides 40, 41 Stopper 42 Butterfly bolt 43a, 43b Locking groove 44 Spring 45 Automatic mounting / demounting mechanism W Internal surface W of U-shaped groove block Internal surface S of groove block Block S step groove groove block Internal step surface S 'VS side groove block Top of

Claims (3)

Suspension ring (10), shaft (13) adjustable in length extending horizontally, and a pair of cams (15a, 15b) rotatably provided around cam bolts (14a, 14b) at both ends of the shaft And a pair of cam links (12a, 12b) respectively connected between the ring bolt (11) provided at the lower end of the ring and one end of the cam, and a long groove (vertically movably inserted through the ring bolt) 21), and when the suspension ring is lifted, a pair of cams are projected outward through the ring bolt and the pair of cam links so as to be pressed against the inner wall surface of the concrete block In the concrete block suspension clamp configured as described above, rollers (31a, 31b) that respectively rotate freely are provided below both ends of the shaft. Concrete block hanging clamp to. Furthermore, it has a pair of slide links (25a, 25b) rotatably connected to the support plate, and a shaft (29) connecting the lower ends of these slide links, and the roller is provided on the outer periphery of the shaft The suspension clamp in a concrete block according to claim 1, wherein the clamp is rotatably inserted. A positioning collar (30) having a length shorter than the axial length of the shaft is externally fitted to the shaft, and the roller is sandwiched between the lower end of the slide link by the positioning collar to prevent axial movement The suspension clamp in a concrete block according to claim 2, characterized in that it is positioned.