Clamp

Abstract

PURPOSE: To provide a clamp that can be lifted while ensuring safety in particular by setting an iron sill plate in a horizontal state, and can be easily mounted on four corner parts of an iron plate.CONSTITUTION: A clamp comprises: a support housing A which is composed of an upper surface part 1, a lower surface part 2, and two side surface parts 3 adjacent to each other at right angles and which is provided with a storage space part 4 having an opening part 42 into which a corner part 91 of an iron sill plate 9 is loosely inserted; and a lifting lever 5 mounted on the support housing A. A closed region part 41 in which a corner part 4a is formed is created in the storage space part 4 of the support housing A. The lifting lever 5 is freely swingable on a vertical plane with the center in a longitudinal direction as a swinging center 51, one-end side in the longitudinal direction as viewed from the swinging center 51 is a pressing end part 52 that withdraws into the support housing A, a withdrawal hole 11 through which the pressing end part 52 withdraws is formed in the upper surface 1, and the other-end side in the longitudinal direction as viewed from the swinging center 51 is a lifting end part 53. With the lifting end part 53 of the lifting lever 5 in a lifted state, the pressing end part 52 can protrude into the support housing A via the withdrawal hole 11.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a clamp that can lift a paving iron plate in a horizontal state while ensuring safety and can be easily attached to four corners of the paving iron plate.

Background Art

[0002] At construction sites, civil engineering sites, or building demolition sites, there is a lot of soft ground. On such ground, it becomes difficult to carry out construction and civil engineering work safely, and it also becomes difficult for construction vehicles to travel. Therefore, paving iron plates are often spread on the ground to simply reinforce the ground at the work site. The size of this type of paving iron plate is generally 1524 mm × 3048 mm × 22 mm, and its weight is about 802 kg.

[0003] When such a paving iron plate is transported to a construction or civil engineering site, installed on a predetermined ground, or the installation position is changed or removed, of course, a crane is used to lift the paving iron plate. In this paving iron plate lifting work, it is generally common to use a lifting clamp at present. There are many types of this lifting clamp.

[0004] Many of the conventional types of clamps (also referred to as lifting tools, lowering tools, or lifting devices) are of the type that grip both sides of a support housing (workpiece) as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 9-71384). In Patent Document 1, when lifting a paving iron plate horizontally, specifically, four clamps are prepared, and any four positions of the paving iron plate are clamped by the rotatable cam and the fixed receiving surface of the clamp.

[0005] Then, by lifting the wire or chain connected to each clamp, each cam of the four clamps rotates with respect to the receiving surface, increasing the clamping pressure on the paving iron plate by the cam and the receiving surface, and enabling the paving iron plate to be lifted horizontally in a firmly clamped state. Further, Patent Document 2 (Japanese Patent Application Laid-Open No. 2011-42441) is a type of clamp provided with a rectangular annular holding frame portion into which the corner portion of the paving iron plate can be inserted, and can lift the paving iron plate in a substantially horizontal state.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, the operation of transporting the paving iron plate to the construction site and installing it on soft ground is to grasp the paving iron plate transported to the site by truck or the like with a clamp, attach a chain or wire or the like to this clamp, and further connect the chain or wire to the hook of the crane to lift or lower the paving iron plate and install it on the ground.

[0008] Conventional clamps are attached to both sides of each of either the opposing long sides or the opposing short sides of a rectangular paving iron plate, that is, at four locations on the paving iron plate, and lift or lower the paving iron plate horizontally to install the paving iron plate transported to the site on the ground at the site.

[0009] In the past, attaching clamps to two locations on each side of one long side or one short side of a paving iron plate and lifting it, that is, lifting the paving iron plate with two clamps, would cause the paving iron plate to be lifted vertically instead of horizontally. Therefore, with gripping-type clamps, if the gripping is not complete and the clamping force due to gripping is weak, there is a possibility that the paving iron plate will fall, which poses a danger to the operation and is likely to lead to accidents. Thus, such operations are avoided as much as possible.

[0010] Patent Document 1 discloses a general gripping-type clamp. This clamp grips both sides of a workpiece (paving iron plate) between the bottom of the base and the clamp part (the name in Patent Document 1), and by pulling a wire upward, the clamp part operates, increasing the clamping force on both sides of the workpiece and enabling the workpiece to be lifted. Next, Patent Document 2 is provided with a holding frame that supports the four corners of the paving iron plate in a substantially enveloping manner. By inserting the four corners of the rectangular paving iron plate into the holding frame and pulling upward the chain connected to the four holding frames, the paving iron plate can be lifted horizontally.

[0011] By the way, the ground where the paving iron plate is installed is usually a soft ground covered with soil, mud, etc., and the paving iron plate is often installed directly on this ground. That is, it is placed directly on the ground, generally referred to as a flat placement. And such a flat placement of the paving iron plate is easy to install, but due to the flat placement, the lower surface side of the paving iron plate is in contact with the ground. Or, because the paving iron plate is extremely heavy (about 800 kg), it may be slightly buried so that the paving iron plate sinks into the soft surface due to its own weight.

[0012] Therefore, when attaching a clamp to a predetermined location on a paving iron plate flat-placed on the ground, with the types of clamps disclosed in Patent Document 1 and Patent Document 2, it is necessary to lift the paving iron plate slightly upward from the ground to create a space between the back surface of the paving iron plate and the ground, and insert a part of the clamp into that space, otherwise, it is impossible to grip or hold both sides of the paving iron plate in a clamped state.

[0013] Also, although it is described that the clamp having the holding frame of the holding type of Patent Document 2 is inserted into the corner of the floor iron plate, the vertical dimension of the space for inserting the corner of the floor iron plate in the holding frame seems to be substantially equal to the thickness of the corner. Therefore, a considerable force must be applied to the holding frame to insert the corner into the holding frame. However, no portion suitable for applying an external force to the holding frame disclosed in Patent Document 2 is found, and it seems extremely difficult to attach the holding frame to the corner of the floor iron plate. Therefore, the technical problem to be solved by the present invention is to provide a clamp that can be easily attached to the corner of a floor iron plate, can be lifted and lowered horizontally extremely safely, and can easily recover the floor iron plate laid flat on the ground.

Means for Solving the Problem

[0014] Therefore, as a result of intensive research to solve the above problems, the inventor has made the invention of claim 1 a support housing formed of a top surface portion, a bottom surface portion, and side surface portions configured at right angles, and having a storage space portion with an opening into which a corner of a floor iron plate is inserted, and a lifting lever mounted on the support housing. An enclosed region portion having a corner portion is formed by the side surface portion configured at right angles on the back side of the storage space portion of the support housing. The lifting lever is swingable in a vertical plane with the central portion in the longitudinal direction as a swing center portion. One end side of the swing center portion is a pressing end portion that protrudes in and out of the support housing, and the other end side of the swing center is a lifting end portion. When the lifting end portion of the lifting lever is in a lifted state, the pressing end portion can protrude into the support housing. By making it a clamp characterized in this way, the above problems have been solved.

[0015] The invention according to claim 2 is a clamp according to claim 1, wherein discharge holes are formed in the lower surface portion of the support housing and near the corner portions, thereby solving the above problems. The invention according to claim 3 is a clamp according to claim 2, wherein the discharge holes are formed in a triangular shape along both side surface portions at the corner portions, thereby solving the above problems.

[0016] The invention according to claim 4 is a clamp according to claim 2, wherein the discharge holes are formed by cutting away a portion corresponding to the corner portion of the lower surface portion, thereby solving the above problems. The invention according to claim 5 is a clamp according to claim 1 or 2, wherein the upper surface portion and the lower surface portion of the support housing are triangular, the support housing is a triangular housing when viewed from a plane, and the opening is provided on the long side thereof, thereby solving the above problems.

[0017] The invention according to claim 6 is a clamp according to claim 1 or 2, wherein the upper surface portion and the lower surface portion of the support housing are square, the support housing is a square housing when viewed from a plane, and the opening is provided across any two adjacent sides, thereby solving the above problems. The invention according to claim 7 is a clamp according to claim 1 or 2, wherein the upper surface portion and the lower surface portion of the support housing are triangular, and the pressing end portion of the lifting lever has a rough surface, thereby solving the above problems.

Advantages of the Invention

[0018] In the invention according to claim 1, the clamp has a support housing in which a storage space portion having an opening into which a corner portion of the iron sheet is loosely inserted is formed. By providing four clamps, the four corner portions of the rectangular iron sheet can be loosely inserted, so that when the iron sheet is lifted by a crane, the iron sheet can be lifted horizontally in a very stable state.

[0019] Furthermore, the clamp is provided with a lifting lever. The lifting lever is configured such that in the lifted state of the lifting end portion, the pressing end portion can project into the support housing through the insertion hole. During the lifting operation, the corner portion of the iron plate laid loosely inserted into the support housing can be firmly fixed. Further, when the four corner portions of the iron plate are supported by the clamps and lifted, the four clamps will inevitably apply force toward the central portion of the plane of the iron plate via the lifting cable material, enabling more firmly supporting the iron plate, preventing the iron plate from falling, and allowing for safe lifting operation.

[0020] In the invention of claim 2, due to the discharge holes formed on the lower surface portion of the support housing and near the corner portions, the soil and mud that have entered the support housing can be discharged from the discharge holes. The discharge of the soil and mud that have entered the support housing from the discharge holes can be carried out together with the operation of loosely inserting the corner portion of the iron plate into the support housing. That is, during the process of the corner portion being loosely inserted into the support housing, the corner portion presses the soil and mud toward the discharge holes within the support housing, thereby enabling the soil and mud to be pushed out of the support housing through the discharge holes.

[0021] Furthermore, when recovering the iron plate laid flat on the ground, the clamp of the present invention has a closed region portion centered on the corner portion on the back side of the clamp. This closed region portion can be used as a portion to be struck with a hammer or the like. By striking the outer surface of this closed region portion with a hammering tool, the corner portion of the iron plate can be easily inserted into the support housing. That is, in the conventional clamp, it was necessary to lift the iron plate laid flat on the ground even slightly, attach the conventional type of clamp, and arrange a crossbeam or the like between the iron plate and the ground.

[0022] However, the clamp of the present invention has a closed region part where a hammer can easily strike and a discharge hole. When the corner of the iron plate is loosely inserted into the support housing, by striking the closed region part with a hammer, the corner can be relatively loosely inserted into the support housing. Also, during this loose insertion operation process, even if soil or mud enters the support housing, when the corner is loosely inserted into the support housing, the soil or mud can be discharged from the discharge hole to the outside of the support housing, and the accurate loose insertion and placement of the corner can be achieved without the loose insertion operation of the corner into the support housing being hindered by the soil or mud.

[0023] In the invention of claim 3, since the discharge hole is formed in a triangular shape on the lower surface part, by forming the discharge hole, the reduction in strength can be minimized. In the invention of claim 4, the discharge hole can be formed in the support housing extremely easily. In the invention of claim 5, the size of the clamp can be made compact. In the invention of claim 6, the support of the corner of the iron plate by the support housing can be made better. In the invention of claim 7, the support of the corner of the iron plate by the clamp can be made even stronger.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0025] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, although the name of the present invention is a clamp, generally, a clamp may also be referred to as a lifting tool, a lowering tool, a lifting device, etc., and such things are also included in the concept of a clamp. The clamp of the present invention has a support basket A and a lifting lever mechanism part B (see FIG. 1). The support housing A is composed of an upper surface part 1, a lower surface part 2, and two side surface parts 3 configured at right angles (or corner-shaped), and all of these are made of metal plate materials (see FIGS. 1 and 2). In the present invention, the upper surface part 1, the lower surface part 2, and both side surface parts 3 use those with a plate thickness of about 6 mm, but it is not limited to this dimension, and the plate thickness may be appropriately changed according to the usage situation.

[0026] Then, the upper surface portion 1 and the lower surface portion 2 are arranged in parallel with a predetermined interval in the vertical direction. Between the upper surface portion 1 and the lower surface portion 2 and along the outer peripheries of the upper surface portion 1 and the lower surface portion 2, two side surface portions 3 are arranged, and these are fixed to each other by fixing means such as welding. As a result, a housing is configured in which a storage space portion 4 having an opening portion 42 provided therein is formed, and this housing becomes the support housing A. The corner portion 91 of the iron plate 9 is loosely inserted into the storage space portion 4 of the support housing A( See FIG. 6).

[0027] Here, "loosely inserted" means a state in which it can be inserted with a margin. Specifically, in the storage space portion 4, it can be inserted so that a play space is generated around the corner portion 91 of the iron plate 9. However, when the corner portion 91 of the iron plate 9 is completely stored, the periphery of the corner portion 91 and the side surface portion 3 of the support housing A are in contact with each other, and by the operation of the lifting lever B described later, the corner portion 91 of the iron plate 9 is firmly fixed to the support housing A without a gap.

[0028] In order for the corner portion 91 of the iron plate 9 to be loosely inserted into the storage space portion 4 from the opening portion 42 of the support housing A, the vertical dimension of the opening portion 42 is formed to be slightly larger than the plate thickness dimension of the corner portion 91 of the iron plate 9. That is, the interval between the upper surface portion 1 and the lower surface portion 2 of the support housing A is set to be larger with a margin than the plate thickness dimension of the corner portion 91 of the iron plate 9. Specifically, the plate thickness of the iron plate 9 is about 22 mm, and the interval between the upper surface portion 1 and the lower surface portion 2 of the support housing A is about 40 mm. Therefore, the interval between the upper surface portion 1 and the lower surface portion 2 of the support housing A, that is, the vertical dimension of the opening portion 42 is about 1.3 to about 2 times the plate thickness of the corner portion 91 of the iron plate 9 (see FIG. 6).

[0029] When viewed from the opening 42 of the storage space 4 of the support housing A, at the back side, a corner portion 4a is formed where the two side surfaces 3, 3 are adjacent to each other at a right angle (see Fig. 2). The back side of the storage space 4 is a closed space surrounded by the upper surface portion 1, the lower surface portion 2, and the two side surfaces 3, 3 that form the wall surfaces on both sides centered around the corner portion 4a. Centered around the corner portion 4a, in and around the corner portion 4a, and within the closed space, it is called the closed region portion 41.

[0030] However, in the closed region portion 41, there is a discharge hole 21 to be described later, and the portion excluding the discharge hole 21 is a closed space. The corner portion 91 of the iron plate 9 inserted loosely from the opening 42 into the storage space 4 of the support housing A abuts against the corner portion 4a and the two side surfaces 3, 3 of the closed region portion 41 at the back side of the support housing A, and is wrapped by the closed region portion 41 of the support housing A. Further, the corner portion 4a is a portion where the longitudinal ends of the two side surfaces 3 intersect at a right angle.

[0031] And the configuration of the intersection of the ends of the two side surfaces 3 is such that the ends of the two side surfaces 3, 3 are flat surfaces perpendicular to each other in the longitudinal direction, and the end face of one side surface 3 abuts against the other side surface 3 and is fixed by welding or the like (see Fig. 2(C)). Another configuration of the intersection of the ends of the two side surfaces 3 is that the end faces of the two side surfaces 3, 3 are formed as inclined surfaces with an angle of 45°, the inclined end faces abut against each other, and are fixed by welding or the like (see Fig. 2(E)).

[0032] The support housing A is a housing having a triangular shape when viewed from a plane. Since the support housing A has a triangular shape, both the upper surface portion 1 and the lower surface portion 2 are of the same triangular shape, specifically, a right triangle (see FIGS. 1(A), (B), and 2(A)). And the long side sides of the upper surface portion 1 and the lower surface portion 2, each being a right triangle, are arranged to correspond to each other, and an opening 42 is provided across both long sides (see FIGS. 1(A), (C), (D), and 2(A)). An insertion and extraction hole 11 is formed in the upper surface portion 1 of the support housing A (see FIGS. 1(D) and 2(A)). The insertion and extraction hole 11 is formed as a substantially rectangular long hole, and is a portion where the pressing end portion 52 of the lifting lever 5 of the lifting lever mechanism portion B described later makes an insertion and extraction movement.

[0033] A discharge hole 21 is formed in the lower surface portion 2 of the support housing A and near the corner portion 4a (see FIGS. 1(C), (D), 2(B), and 2(C)). When foreign matters such as soil and sand on the ground enter the storage space portion 4 of the support housing A, the discharge hole 21 serves to discharge the foreign matters from the discharge hole 21 to the outside of the support housing A by loosely inserting the iron plate 9 into the storage space portion 4. As described above, the discharge hole 21 is provided near the corner portion 4a. The discharge hole 21 has a triangular shape, specifically, a right triangular shape having two sides along the both side surface portions 3, 3 at the corner portion 4a. The size (for example, area) of the discharge hole 21 is determined in anticipation of the discharge amount of foreign matters, but is determined in accordance with the size of the gravel mixed in the foreign matters.

[0034] Also, there is an embodiment in which the discharge hole 21 is formed by making the shape of the lower surface portion 2 of the support housing A exclude the vicinity of the corner portion 4a (see FIG. 2(E)). Specifically, the shape of the lower surface portion 2 is trapezoidal, and an opening formed between the short upper side portion and the both side surface portions 3, 3 adjacent thereto at a right angle is used as the discharge hole 21. With the discharge hole 21 according to this embodiment, there is an advantage that the step of drilling a through hole for the discharge hole 21 in the lower surface portion 2 in advance can be omitted.

[0035] Next, the lifting lever mechanism portion B includes a lifting lever 5 and a swing support portion 6 (FIG. 1 (See the reference). The lifting lever 5 performs a substantially balance-like operation. The lifting lever 5 has a swing center portion 51 formed at the central portion in the longitudinal direction. One end side in the longitudinal direction as viewed from the swing center portion 51 is a pressing end portion 52, and the other end side is a lifting end portion 53. The swing center portion 51 is actually a through hole, and it is a portion through which the shaft portion of the bolt portion 62a constituting the swing support portion 6 described later is inserted. The pressing end portion 52 protrudes in and out of the storage space portion 4 from the protruding and retracting hole 11 of the upper surface portion 1. When lifting, the pressing end portion 52 presses the corner portion 91 of the iron plate 9 loosely inserted in the storage space portion 4 to be in a pressed state. The lifting end portion 53 is a portion for connecting to a cable material 8 such as a chain or a wire when the clamp of the present invention is lifted by a crane, and a connecting hole 53a is formed therein. The swing support portion 6 is composed of a swing base 61 and a swing shaft portion 62 (see FIG. 1).

[0036] The swing base 61 is arranged on the outer surface of the upper surface portion 1 and swingably supports the lifting lever 5 via the swing shaft portion 62. The swing shaft portion 62 is composed of a bolt portion 62a, a nut portion 62b, and a washer 62c. Two swing bases 61 are arranged in parallel at a predetermined interval so as to sandwich the width direction of the protruding and retracting hole 11 of the upper surface portion 1, and are fixed on the upper surface portion 1 by fixing means such as welding. Shaft holes 61a through which the shaft portion of the bolt portion 62a is inserted are formed in both swing bases 61.

[0037] The lifting lever 5 is arranged between both swing bases 61. The shaft hole 61a of the swing base 61 and the hole of the swing center portion 51 of the lifting lever 5 are penetrated by the bolt portion 62a, and the washer 62c and the nut portion 62b are tightened on the bolt portion 62a. As a result, the lifting lever 5 performs a swinging operation on the upper surface portion 1 in a vertical plane, and the pressing end portion 52 protrudes in and out through the protruding and retracting hole 11 so as to be able to protrude into the storage space portion 4 of the support housing A. A cable material 8 such as a chain or a wire is connected to the connecting hole 53a of the lifting end portion 53.

[0038]

[0039] ​Then, the lifting lever 5 is configured such that in the lifted state where the lifting end portion 53 thereof is lifted by the cable member 8, the pressing end portion 52 can project into the support housing A through the insertion hole 11. More specifically, in the unloaded state, the pressing end portion 52 of the lifting lever 5 is located outside the upper surface portion 1, and when the lifting end portion 53 of the lifting lever 5 is lifted by the cable member 8, the pressing end portion 52 enters and projects into the storage space portion 4 within the support housing A from the insertion hole 11 in the upper surface portion 1 (see Fig. 6(B)).

[0040] Next, the process of lifting the paving iron plate 9 with the clamp of the present invention will be described. First, a total of four clamps of the present invention are prepared (see Figs. 3(A) and 4(A)). Then, the four corner portions 91 of the paving iron plate 9 are loosely inserted into the storage space portion 4 from the opening 42 of the support housing A of the clamp (see Figs. 4(C) and 6(A)). At this time, the pressing end portion 52 of the lifting lever 5 is not in a state of pressing the corner portion 91 of the paving iron plate 9.

[0041] When the clamps are attached to the four corner portions 91 of the paving iron plate 9, next, when the lifting end portion 53 of the lifting lever 5 is lifted upward by a cable member 8 such as a chain or a wire connected to the lifting end portion 53 of the lifting lever 5 by a crane, the lifting lever 5 swings about the swing center portion 51 as the swing center, and the pressing end portion 52 moves downward (see Figs. 4(B) and 6(B)). Further, the pressing end portion 52 projects from the insertion hole 11 into the storage space portion 4, and presses the corner portion 91 of the paving iron plate 9 stored in the storage space portion 4 with a pressing force P, and the corner portion 91 is clamped and pressed between the pressing end portion 52 and the lower surface portion 2 (see Fig. 6(C)). Note that the pressing force P of the pressing end portion 52 against the corner portion 91 of the paving iron plate 9 increases as the weight of the paving iron plate 9 increases.

[0042] Then, by simultaneously lifting four number of clamps together with the cable material 8 using a crane, the paving steel plate 9 can be lifted horizontally (see Fig. 3(A)). At this time, the four clamps attached to the four corners 91 of the paving steel plate 9 are such that each cable material 8 is connected in a converging state to a hook or the like of the crane from above (see Fig. 3(B), (C), Fig. 4, etc.), so that a force F toward the center of the paving steel plate 9 is generated in the four clamps (see Fig. 5, Fig. 6(C)). The four forces F applied to the four clamps act equally on the four corners 91 of the paving steel plate 9. Moreover, since the corners 91 are stored in a held state in the storage space portion 4 of the support housing A, it can be lifted and transported in an extremely stable and strong holding state (see Fig. 4(A)). Also, a shackle may be provided between the cable material 8 and the hook of the crane, and the rings at the upper ends of the four cable materials 8 may be collectively connected to one shackle (see Fig. 3(C)).

[0043] Next, the process of recovering the paving steel plate 9 installed on the ground G will be described with reference to Figs. 7 and 8. First, the ground G at the construction site is generally a ground made of soil or the like and is a soft surface, and may become muddy due to rainfall or the like. Also, since the paving steel plate 9 is an extremely heavy object, it is in close contact with the surface of the ground G. That is, there is almost no space between the paving steel plate 9 and the ground G (see (I) of Fig. 7(A), Fig. 8(A)).

[0044] In such a case, for the purpose of recovering the paving steel plate 9, when lifting, in the case of a conventional clamp, a tool such as a bar is used instead of a lever to partially lift the paving steel plate 9 from the ground G to provide a space between the paving steel plate 9 and the ground G, and a conventional type of clamp is attached using this space. Further, in order to maintain this space between the paving steel plate 9 and the ground G, a prop or the like must be prepared.

[0045] In the clamp of the present invention, an operator shallowly excavates the ground G where the paving iron plate 9 is laid and the ground G around the corner 91 of the paving iron plate 9 to form a depression k. The depth of this depression k may be extremely shallow, about the thickness of the lower surface portion 2. Furthermore, as described above, the ground G is a soft surface and can be easily dug with a shovel or scoop held by the operator. In this way, the clamp of the present invention is placed in the excavated depression k so that the opening 42 faces the corner 91 (see (II), (III) in Fig. 7(A) and Fig. 8(B)). Then, the operator uses a striking tool such as a hammer at T (see (IV) in Fig. 7(A)) to strike at the location where the both side surface portions 3, 3 of the support housing A of the clamp are orthogonal, that is, from the outer side of the corner portion 4a, and attach the clamp so that the corner 91 of the paving iron plate 9 is loosely inserted into the support housing A.

[0046] At this time, the soil or mud on the ground G may enter the storage space portion 4 of the support housing A (see Fig. 8(C)). However, in the process of the corner 91 being loosely inserted into the storage space portion 4, the soil or mud can be discharged from the discharge hole 21 provided in the lower surface portion 2 while pushing the soil or mud toward the corner portion 4a side (see Fig. 8(D) and Fig. 8(E)). Also, although the soil or mud accumulated in the storage space portion 4 of the support housing A can be removed by the operator by hand, by simply discharging water from a water pipe into the opening 42, the accumulated soil or mud can be easily and instantaneously discharged from the discharge hole 21 to the outside of the support housing A by the water pressure.

[0047] As a result, the entire corner 91 of the paving iron plate 9 enters the storage space portion 4 of the support housing A and comes into contact with the corner portion 4a and the both side surface portions 3, enabling the clamp to be securely attached to the corner 91 (see Fig. 7(B)). Also, since the back side of the support housing A is the closed region portion 41 when viewed from the opening 42 and the both side surface portions 3 are adjacent to each other, the operator has a shape suitable for driving in by a striking tool such as a hammer T (see (IV) and (B) in Fig. 7(A)).

[0048] As a second embodiment of the present invention, the upper surface portion 1 and the lower surface portion 2 of the support housing A are square-shaped, the support housing A is a square-shaped housing when viewed from a plane, and an opening 42 may be provided across any two adjacent sides [see FIGS. 9(A) and (B)]. In this embodiment, the portions where the two side surface portions 3 and 3 directly contact the two adjacent sides on the upper surface portion 1 and the lower surface portion 2 become the closed region portions 41.

[0049] And the portions that do not contact the side surface portions 3 and 3 of the upper surface portion 1 and the lower surface portion 2 become a part of the upper surface portion 1 and the lower surface portion 2, and are the portions protruding in the horizontal direction from the opening 42. By making the portions protruding from the opening 42 of the upper surface portion 1 and the lower surface portion 2 into the upper auxiliary support plate 1a and the lower auxiliary support plate 2a, the support housing A in the second embodiment can support the corner portion 91 of the iron sheet 9 more firmly.

[0050] Also, the pressing end portion 52 of the lifting lever 5 may be a rough surface 52a. The rough surface 52a may be serrated [see FIG. 9(C)] or a knurled surface with repeated irregularities [see FIG. 9(D)]. By providing the rough surface 52a on the pressing end portion 52, the corner portion 91 of the iron sheet 9 housed in the support housing A can be firmly fixed by the lifting lever 5.

Explanation of Reference Numerals

[0051] A... Support housing, 1... Upper surface portion, 11... Retractable hole, 2... Lower surface portion, 21... Discharge hole, 3... Side surface portion, 4... Storage space portion, 4a... Corner portion, 41... Closed region portion, 42... Opening B... Lifting lever mechanism portion, 5... Lifting lever, 51... Oscillation center portion, 52... Pressing end portion 53... Lifting end portion, 6... Oscillation support portion, 9... Iron sheet, 91... Corner portion.

Claims

1. The support housing is made up of an upper surface, a lower surface, and two side surfaces that are perpendicular to each other, and has a storage space having an opening in one part into which a corner of a steel plate is inserted loosely. The support housing is equipped with a lifting lever. A rear portion of the storage space of the support housing as viewed from the opening is a closed area portion in which a corner portion is formed by two surfaces adjacent to each other at a right angle, The lifting lever is capable of swinging freely on a vertical plane with the center point in the longitudinal direction as the swing center, one end side in the longitudinal direction as viewed from the swing center is a pressing end that protrudes into the support housing, a hole is formed in the top surface through which the pressing end protrudes, and the other end side in the longitudinal direction as viewed from the swing center is a lifting end, and when the lifting end of the lifting lever is in a lifted state, the pressing end can protrude into the support housing through the hole.

2. 2. The clamp according to claim 1, wherein said support housing has a drain hole formed in said lower surface and adjacent said corner.

3. 3. The clamp according to claim 2, wherein the discharge hole is formed in a triangular shape having two sides along both side surfaces of the corner portion.

4. 3. The clamp according to claim 2, wherein the discharge hole is formed by excluding the vicinity of the corner of the lower surface portion.

5. 3. The clamp according to claim 1 or 2, wherein the upper surface and the lower surface of the supporting housing are triangular in shape, the supporting housing is a triangular housing when viewed from above, and the opening is provided on the long side thereof.

6. 3. The clamp according to claim 1 or 2, wherein the upper surface and the lower surface of the supporting housing are rectangular in shape, the supporting housing is a rectangular housing when viewed from above, and the opening is provided along any adjacent two sides.

7. 3. The clamp according to claim 1, wherein the pushing end of the lifting lever is provided with a rough surface.

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