Clamp

Abstract

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.SOLUTION: 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 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 on 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] In particular, the present invention relates to a clamp that can hold a steel plate in a horizontal position, lift it while ensuring safety, and can be easily attached to the four corners of the steel plate. [Background technology]

[0002] Many construction sites, civil engineering sites, and building demolition sites have soft ground, which makes it difficult to safely carry out construction and civil engineering work, and also makes it difficult for construction vehicles to run on. For this reason, steel plates are often laid on the ground to simply reinforce the ground at work sites. The size of this type of steel plate is generally 1524mm x 3048mm x 22mm, and it weighs about 802kg.

[0003] When such steel plates are transported to a construction or civil engineering site and installed on the specified ground, or when they are moved or removed, a crane is used to lift the steel plates. Currently, lifting clamps are generally used for this steel plate lifting work. There are many types of lifting clamps.

[0004] A conventional type of clamp (also called a lifting tool, a suspending tool, or a hanging tool) is disclosed in Patent Document 1 (JP Patent Publication 99 As disclosed in US Pat. No. 5,713,844, a supporting body (workpiece) is clamped on both sides. In Patent Document 1, when a steel plate is to be lifted horizontally, specifically, four clamps are prepared, and the steel plate is clamped at any four points between the rotatable cams of the clamps and the fixed receiving surfaces.

[0005] By lifting the wires or chains connected to each clamp, the cams of the four clamps rotate relative to the receiving surface, increasing the clamping pressure on the steel plate by the cams and receiving surface, allowing the steel plate to be lifted horizontally in a firm clamping state.Patent Document 2 (JP Patent Publication 2011-42441) describes a type of clamp equipped with a rectangular ring-shaped holding frame into which the corners of the steel plate can be inserted, allowing the steel plate to be lifted approximately horizontally. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-71384 [Patent Document 2] JP 2011-42441 A Summary of the Invention [Problem to be solved by the invention]

[0007] Incidentally, the work of transporting steel plates to a construction site and installing them on soft ground involves grasping the steel plates transported to the site by truck or the like with a clamp, attaching a chain or wire to the clamp, and then connecting the chain or wire to the hook of a crane, and lifting and lowering the steel plates to install them on the ground.

[0008] Conventional clamps are attached to both sides of either the opposing long sides or the opposing short sides of a rectangular steel plate, i.e., to each of the four points on the steel plate, and the steel plate is lifted and lowered horizontally to place the steel plate transported to the site on the ground at the site.

[0009] In addition, in the past, when a steel plate was lifted by attaching clamps to two points on both sides of one long side or one short side, that is, when the steel plate was lifted with two clamps, the steel plate was not lifted horizontally but vertically. Therefore, with the use of gripping-type clamps, if the gripping force was not complete and the holding force was weak, the steel plate could fall. This makes the work dangerous and prone to accidents, so this type of work is avoided as much as possible.

[0010] Patent Document 1 discloses a general type of gripping clamp. Both sides of the work (steel plate) are clamped between the bottom of the base and the clamping part (name in Patent Document 1), and the clamping part operates by pulling the wire upward, increasing the clamping force on both sides of the work, making it possible to lift the work. Next, Patent Document 2 discloses a device equipped with a holding frame that supports the four corners of the steel plate in a roughly enveloping manner, and by inserting the four corners of the rectangular steel plate into the holding frame and pulling upward the chains connected to the four holding frames, the steel plate can be lifted horizontally.

[0011] Incidentally, the ground on which steel plates are installed is usually a soft foundation covered with soil or mud, and the steel plates are often installed directly on this ground. In other words, they are placed directly on the ground, which is generally called flat placement. Placing steel plates flat in this way is easy to install, but because it is laid flat, the bottom side of the steel plate comes into contact with the ground. Or, because steel plates are extremely heavy (approximately 800 kg), the steel plate may sink slightly into the soft surface due to its own weight.

[0012] Therefore, when attaching a clamp to a designated location on a steel plate laid flat on the ground, with the type of clamp disclosed in Patent Documents 1 and 2, the steel plate must be lifted slightly above the ground to create a space between the back surface of the steel plate and the ground, and part of the clamp must be inserted into that space in order to grasp or hold both sides of the steel plate in a clamping manner.

[0013] In addition, Patent Document 2 describes a clamp having a holding frame of a wrap type that is inserted into the corner of a steel plate, but the vertical dimension of the space in the holding frame into which the corner of the steel plate is inserted seems to be approximately equal to the thickness of the corner, and therefore a considerable force must be applied to the holding frame to insert the corner into the holding frame. However, there is no part of the holding frame disclosed in Patent Document 2 that is suitable for applying force from the outside, and it seems extremely difficult to attach the holding frame to the corner of the steel plate. Therefore, the technical problem that the present invention aims to solve is to provide a clamp that is easy to attach to the corner of a steel plate, can be lifted and lowered horizontally in an extremely safe manner, and can easily recover a steel plate laid flat on the ground. [Means for solving the problem]

[0014] Therefore, the inventors have conducted intensive research to solve the above-mentioned problems, and as a result, have discovered that the invention of claim 1 is a support housing having a storage space section formed with an opening into which a corner of a steel sheet is loosely inserted, the support housing being provided with a lifting lever, the support housing being provided with a rear part as viewed from the opening of the storage space section of the support housing being a rear joining part where the longitudinal ends of the two side parts join at a right angle, and the lifting lever being provided with a vertically extending vertical joint section with a longitudinal center part as a swing center section. The above problem was solved by providing a clamp that is capable of freely swinging on a surface, one end side in the longitudinal direction as viewed from the swing center is a pressing end that protrudes into the supporting 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 supporting housing through the hole, and a discharge hole is formed in the bottom surface of the supporting housing near the corner of the rear mixing portion.

[0015] The above problem is solved by the invention of claim 2, which is the clamp according to claim 1, characterized in that the discharge hole is formed in a triangular shape having two sides along both side surfaces at a corner of the rear joining portion.The above problem is solved by the invention of claim 3, which is the clamp according to claim 1, characterized in that the discharge hole is formed by excluding the vicinity of the corner of the rear joining portion of the lower surface portion.

[0016] The above problem is solved by the invention of claim 4, which is the clamp according to claim 1 or 2, characterized in that the upper and lower surface portions of the supporting housing are triangular, the supporting housing is a housing having a triangular shape when viewed from above, and the opening is provided on a long side thereof.The above problem is solved by the invention of claim 5, which is the clamp according to claim 1 or 2, characterized in that the upper and lower surface portions of the supporting housing are quadrangular, the supporting housing is a housing having a quadrangular shape when viewed from above, and the opening is provided along any adjacent two sides.

[0017] The above problem is solved by providing the invention of claim 6, which is a clamp as described in claim 1 or 2, characterized in that the pressing end of the lifting lever has a rough surface. Effect of the Invention

[0018] In the invention of claim 1, the clamp has a support housing formed with a storage space portion having an opening into which the corners of the steel plate are loosely inserted, and by providing four clamps, the four corners of the rectangular steel plate can be loosely inserted, so that when the steel plate is lifted by a crane, it can be lifted horizontally in an extremely stable state.

[0019] Furthermore, the clamp is equipped with a lifting lever, and the pressing end of the lifting lever can protrude into the support housing through the recessed hole when the lifting end is in the lifted state, so that the corners of the steel plate loosely inserted in the support housing can be firmly fixed during the lifting operation. Furthermore, when the steel plate is lifted while its four corners are supported by the clamps, the four clamps inevitably apply force toward the center of the steel plate through the lifting cable, so that the steel plate can be supported even more firmly, preventing it from falling and enabling safe lifting operation.

[0020] Furthermore, in the invention of claim 1, the soil and mud that has entered the support housing can be discharged from the discharge hole formed on the underside of the support housing near the corner of the rear mixing part. The soil and mud that has entered the support housing can be discharged from the discharge hole at the same time as the corner of the steel plate is loosely inserted into the support housing. In other words, in the process of loosely inserting the corner into the support housing, the corner presses the soil and mud against the discharge hole inside the support housing, and this makes it possible to push the soil and mud out of the support housing through the discharge hole.

[0021] The clamp of the present invention has a closed area at the rear intermingling portion and a discharge hole, and when the corner of the sole plate is loosely inserted into the support housing, the closed area at the rear intermingling portion is pressed to allow the corner to be loosely inserted into the support housing. Even if soil or mud gets into the support housing during this loose insertion process, the soil or mud can be discharged from the support housing through the discharge hole as the corner is loosely inserted into the support housing, and the corner can be accurately inserted and positioned without being hindered by the soil or mud.

[0022] In the invention of claim 2, the discharge hole is formed in a triangular shape on the underside, so that by forming the discharge hole, the reduction in strength can be minimized. In the invention of claim 3, the discharge hole can be formed in the support housing very easily. In the invention of claim 4, the size of the clamp can be made compact. In the invention of claim 5, the corners of the sole plate can be supported even better by the support housing. In the invention of claim 6, the corners of the sole plate can be supported even more firmly by the clamp. [Brief description of the drawings]

[0023] [Figure 1] 1A is a perspective view of a clamp of the present invention, FIG. 1B is a plan view of the clamp, FIG. 1C is a cross-sectional view taken along the line X1-X1 of FIG. 1A, and FIG. 1D is a cross-sectional view taken along the line X2-X2 of FIG. [Diagram 2] 1A is an oblique view of only the supporting housing excluding the lifting lever mechanism, FIG. 1B is an oblique view of the supporting housing excluding the top surface portion, FIG. 1C is an enlarged view of part (α) in FIG. 1B, FIG. 1D is an enlarged view of part (α) in FIG. 1B in another embodiment, and FIG. 1E is an oblique view of the supporting housing in another embodiment excluding the top surface portion. [Diagram 3] 1A is a perspective view of a steel plate being lifted by the clamp of the present invention, FIG. 1B is an enlarged view of part (β) of (A), and FIG. 1C is an enlarged view of part (β) of (A) according to another embodiment. [Figure 4] 1A is an enlarged perspective view of a key portion with a portion cut away showing a steel plate being lifted by the clamp of the present invention, 1B is an enlarged view of part (γ) of 1A, and 1C is an enlarged view of part (γ) of 1A with the clamp and the corner of the steel plate separated. [Diagram 5] 1A is a plan view showing a state in which a steel sheet is lifted by the clamp of the present invention, and FIG. 1B is a side view showing a state in which a steel sheet is lifted by the clamp of the present invention. [Figure 6] 10(A) to 10(C) are vertical cross-sectional side views showing the process of lifting a corner of a steel plate using the clamp of the present invention. [Figure 7] 1A is a schematic diagram showing the process of attaching the clamp of the present invention to a steel plate laid flat on the ground, and FIG. 1B is a perspective view showing the process of attaching the clamp of the present invention to a steel plate laid flat on the ground. [Figure 8] 1(A) to 1(E) are longitudinal sectional side views showing the process of attaching the clamp of the present invention to a steel plate laid flat on the ground. [Figure 9] FIG. 1A is an oblique view of another embodiment of the clamp of the present invention, FIG. 1B is a plan view of another embodiment of the clamp of the present invention, and FIG. 1C and FIG. 1D are longitudinal side views showing embodiments of the rough surface shape of the pressing end of the lifting lever. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Here, the name of the present invention is a clamp, but generally, clamps are also called lifting tools, suspending tools, hoisting tools, etc., and these are also included in the concept of a clamp. The clamp of the present invention has a support housing A and a lifting lever mechanism B (see FIG. 1). The support housing A is made up of an upper surface portion 1, a lower surface portion 2, and two side portions 3 formed at right angles (or corners), all of which are made of metal plate material (see FIGS. 1 and 2). In the present invention, the upper surface portion 1, the lower surface portion 2, and both side portions 3 have a plate thickness of about 6 mm, but this is not limited to this dimension, and the plate thickness may be changed appropriately depending on the usage situation.

[0025] The upper surface portion 1 and the lower surface portion 2 are arranged in parallel with a predetermined distance in the vertical direction, and two side surface portions 3 are arranged between the upper surface portion 1 and the lower surface portion 2 and along the outer periphery of the upper surface portion 1 and the lower surface portion 2, and these are fixed to each other by a fixing means such as welding. In this way, a housing having a storage space portion 4 with an opening portion 42 in one part is formed, and this housing becomes the supporting housing A. The corner portion 91 of the iron plate 9 is loosely inserted into the storage space portion 4 of the supporting housing A (see FIG. 6).

[0026] Here, loose insertion refers to a state in which the iron plate 9 can be inserted with some leeway, specifically, it can be inserted so that there is some leeway around the corner 91 of the iron plate 9 in the storage space 4. However, when the corner 91 of the iron plate 9 is completely stored, the periphery of the corner 91 comes into contact with the side portion 3 of the supporting housing A, and by operation of the lifting lever B, which will be described later, the corner 91 of the iron plate 9 is firmly fixed to the supporting housing A with no gap between them.

[0027] Since the corners 91 of the iron plate 9 can be inserted loosely into the storage space 4 from the opening 42 of the supporting housing A, the vertical dimension of the opening 42 is formed to be slightly larger than the plate thickness dimension of the corners 91 of the iron plate 9. In other words, the distance between the upper surface 1 and the lower surface 2 of the supporting housing A is set to be larger than the plate thickness dimension of the corners 91 of the iron plate 9 with a margin. Specifically, the plate thickness of the iron plate 9 is about 22 mm, and the distance between the upper surface 1 and the lower surface 2 of the supporting housing A is about 40 mm. Therefore, the distance between the upper surface 1 and the lower surface 2 of the supporting housing A, that is, the vertical dimension of the opening 42, is about 1.3 to about 2 times the plate thickness of the corners 91 of the iron plate 9 (see FIG. 6).

[0028] When viewed from the opening 42 of the storage space 4 of the support housing A, a corner 4a is formed where two side surfaces 3, 3 are adjacent to each other at a right angle (see FIG. 2). The rear part of the storage space 4 is a closed space surrounded by the upper surface 1, the lower surface 2, and the side surfaces 3, 3 that form walls on both sides of the corner 4a, and the space that is closed around the corner 4a and is centered on the corner 4a is called a closed area 41.

[0029] However, the closed area 41 has a discharge hole 21, which will be described later, and the area excluding the discharge hole 21 is a closed space. A corner 91 of the sole plate 9, which is loosely inserted into the storage space 4 of the supporting housing A through its opening 42, abuts against a corner 4a of the closed area 41 at the rear of the supporting housing A and both side surfaces 3, 3, and is embraced by the closed area 41 of the supporting housing A. The corner 4a is the area where the longitudinal ends of the two side surfaces 3 meet at a right angle.

[0030] The end portions of the two side portions 3 are joined together in such a manner that the end portions of the two side portions 3, 3 are flat surfaces perpendicular to the longitudinal direction, and the end face of one side portion 3 abuts against the other side portion 3 and is fixed thereto by welding or the like (see FIG. 2(C)). In another manner in which the end portions of the two side portions 3 are joined together, the end faces of the two side portions 3, 3 are formed as inclined surfaces at an angle of 45°, and the inclined end faces abut against each other and are fixed thereto by welding or the like (see FIG. 2(E)).

[0031] The support housing A is a triangular housing when viewed from above. Since the support housing A is triangular, the upper surface part 1 and the lower surface part 2 are both made to have an equal triangular shape, specifically, a right-angled triangle (see Figs. 1(A), (B), and 2(A)). The upper surface part 1 and the lower surface part 2, which are right-angled triangles, are arranged so that their long sides correspond to each other, and an opening part 42 is provided between both long sides (see Figs. 1(A), (C), (D), and 2(A)). The upper surface part 1 of the support housing A is formed with an emergence hole 11 (see Figs. 1(D) and 2(A)). The emergence hole 11 is formed as a substantially rectangular long hole, and is the portion through which the pressing end part 52 of the lifting lever 5 of the lifting lever mechanism part B, which will be described later, emerges.

[0032] A discharge hole 21 is formed in the lower surface 2 of the support housing A near the corner 4a (see Figs. 1(C), (D), 2(B), and (C)). When foreign matter such as soil or sand from the ground gets into the storage space 4 of the support housing A, the discharge hole 21 discharges the foreign matter from the discharge hole 21 to the outside of the support housing A by loosely inserting the iron plate 9 into the storage space 4. As described above, the discharge hole 21 is provided near the corner 4a, and is triangular, specifically, formed as a right triangle having two sides along both side surfaces 3, 3 at the corner 4a. The size (e.g., area) of the discharge hole 21 is determined based on the expected discharge amount of foreign matter, and is determined according to the size of gravel mixed in with the foreign matter.

[0033] There is also an embodiment in which the discharge hole 21 is formed by excluding the vicinity of the corner portion 4a of the bottom surface portion 2 of the supporting housing A (see FIG. 2(E)). Specifically, the shape of the bottom surface portion 2 is trapezoidal, and the opening between the short upper side portion and both side surface portions 3, 3 adjacent at right angles is used as the discharge hole 21. The discharge hole 21 in this embodiment has the advantage that the process of previously drilling a through hole for the discharge hole 21 in the bottom surface portion 2 can be omitted.

[0034] Next, the lifting lever mechanism B includes a lifting lever 5 and a swing support part 6 (see FIG. 1). The lifting lever 5 operates in a roughly balance-like manner, with a swing center part 51 formed at the center in the longitudinal direction of the lifting lever 5, one end in the longitudinal direction as viewed from the swing center part 51 being a pressing end part 52, and the other end being a lifting end part 53. The swing center part 51 is actually a through hole, and is the part through which the shaft part of the bolt part 62a constituting the swing support part 6 described later is inserted.

[0035] The pressing end 52 appears and disappears from the storage space 4 through the inlet hole 11 of the top surface 1, and when hoisting, the pressing end 52 presses against the corner 91 of the sole plate 9 loosely inserted in the storage space 4 to bring it into a pressed state. The lifting end 53 is a part that is connected to a cable material 8 such as a chain or wire when the clamp of the present invention is hoisted by a crane, and has a connection hole 53a formed therein. The swinging support part 6 is composed of a swinging base 61 and a swinging shaft part 62 (see FIG. 1).

[0036] The oscillating base 61 is disposed on the outer surface of the top surface portion 1 and supports the lifting lever 5 via a oscillating shaft portion 62 so that it can freely oscillate. The oscillating shaft portion 62 is composed of a bolt portion 62a, a nut portion 62b, and a washer 62c. The two oscillating bases 61 are disposed in parallel at a predetermined distance so as to sandwich the width direction of the access hole 11 of the top surface portion 1, and are fixed to the top surface portion 1 by a fixing means such as welding. A shaft hole 61a is formed in each of the oscillating bases 61, through which the shaft portion of the bolt portion 62a passes.

[0037] The lifting lever 5 is disposed between the two oscillating bases 61, and a bolt portion 62a is inserted through the shaft hole 61a of the oscillating base 61 and the hole in the oscillating center portion 51 of the lifting lever 5, and a washer 62c and a nut portion 62b are fastened to the bolt portion 62a. This causes the lifting lever 5 to oscillate on a vertical surface above the top surface portion 1, and the pressing end portion 52 projects and retracts through the projection hole 11 so as to project into the storage space portion 4 of the support housing A. A cable material 8 such as a chain or wire is connected to the connection hole 53a of the lifting end portion 53.

[0038] In addition, when the lifting lever 5 is in a lifted state pulled up by the cable 8 of its lifting end 53, the pressing end 52 can protrude into the supporting housing A through the recessed hole 11. More specifically, in an unloaded state, the pressing end 52 of the lifting lever 5 is located outside the top surface 1, and when the lifting end 53 of the lifting lever 5 is pulled up by the cable 8, the pressing end 52 enters and protrudes from the recessed hole 11 of the top surface 1 into the storage space 4 inside the supporting housing A (see FIG. 6(B)).

[0039] Next, the process of lifting the 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 corners 91 of the iron plate 9 are loosely inserted into the storage space 4 through the opening 42 of the support housing A of the clamp (see Figs. 4(C) and 6(A)). At this time, the pressing end 52 of the lifting lever 5 is not in a state where it presses the corners 91 of the iron plate 9.

[0040] When the clamps are attached to the four corners 91 of the iron plate 9, the lifting end 53 of the lifting lever 5 is lifted upward by a crane using a cable 8 such as a chain or wire connected to the lifting end 53 of the lifting lever 5. The lifting lever 5 swings around the swing center 51 as the swing center, and the pressing end 52 moves downward (see Figs. 4(B) and 6(B)). The pressing end 52 then protrudes from the exit hole 11 into the storage space 4 and presses the corners 91 of the iron plate 9 stored in the storage space 4 with a pressing force P, so that the corners 91 are sandwiched and pressed between the pressing end 52 and the lower surface 2 (see Fig. 6(C)). The pressing force P of the pressing end 52 against the corners 91 of the iron plate 9 increases as the weight of the iron plate 9 increases.

[0041] The iron plate 9 can be lifted horizontally by lifting the four clamps together with the cable 8 by a crane (see FIG. 3(A)). At this time, the four clamps attached to the four corners 91 of the iron plate 9 have their respective cables 8 connected to the crane hooks or the like in a converging state (see FIG. 3(B), (C), FIG. 4, etc.), so that the four clamps generate a force F toward the center of the iron plate 9 (see FIG. 5, FIG. 6(C)). The four forces F acting on the four clamps act equally on the four corners 91 of the iron plate 9, and the corners 91 are stored in the storage space 4 of the support housing A in an embraced state, so that the iron plate can be lifted and transported in a very stable and strong holding state (see FIG. 4(A)). A shackle may be provided between the cable 8 and the crane hook, and the rings at the upper ends of the four cables 8 may be connected together to one shackle (see FIG. 3(C)).

[0042] Next, the process of removing the steel plate 9 installed on the ground G will be described with reference to Figures 7 and 8. First, the ground G at a construction site is generally a soft surface made of soil or the like, and can become muddy due to rainfall or the like. In addition, the steel plate 9 is extremely heavy, and is in close contact with the surface of the ground G. In other words, there is almost no space between the steel plate 9 and the ground G (see Figure 7(A)(I) and Figure 8(A)).

[0043] In such a case, when lifting the steel plate 9 for the purpose of retrieving it, with a conventional clamp, a tool such as a crowbar is used as a lever to partially lift the steel plate 9 off the ground G, creating a space between the steel plate 9 and the ground G, and a conventional clamp is attached using this space. Furthermore, in order to maintain the space between the steel plate 9 and the ground G, rafters or the like must be prepared.

[0044] In the clamp of the present invention, a worker shallowly excavates the ground G on which the sole plate 9 is laid and around the corner 91 of the sole plate 9 to form a depression k. The depth of this depression k may be very small, about the thickness of the lower surface 2. Furthermore, as described above, the ground G is a soft surface, and can be easily excavated by a worker with a shovel or scoop. 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) and (B) of Fig. 7(A)). Then, the worker strikes the support housing A of the clamp with a striking tool T such as a hammer (see (IV) of Fig. 7(A)) at the point where both side parts 3, 3 of the clamp intersect at right angles, that is, from the outside of the corner part 4a, and attaches the support housing A so that the corner 91 of the sole plate 9 is loosely inserted.

[0045] At this time, soil and mud from the ground G may get into the storage space 4 of the support housing A (see FIG. 8(C)). However, as the corner 91 is being inserted into the storage space 4, the soil and mud can be pushed toward the corner 4a (see FIG. 8(D)) and discharged from the discharge hole 21 provided in the underside 2 (see FIG. 8(E)). The soil and mud accumulated in the storage space 4 of the support housing A can be removed by hand by an operator, but it can also be easily and instantly discharged from the discharge hole 21 to the outside of the support housing A by simply spraying water from a water hose into the opening 42 due to water pressure.

[0046] As a result, the entire corner 91 of the sole plate 9 enters the storage space 4 of the supporting housing A and comes into contact with the corner 4a and both side sections 3, allowing the clamp to be securely attached to the corner 91 (see Fig. 7(B)). Also, as the rear side of the supporting housing A as seen from the opening 42 is the closed area 41, and both side sections 3 are adjacent to each other, the shape is suitable for an operator to drive in the clamp with a striking tool T such as a hammer (see Fig. 7(A)(IV) and (B)).

[0047] In a second embodiment of the present invention, the upper surface portion 1 and the lower surface portion 2 of the supporting housing A are rectangular in shape, and the supporting housing A is a housing having a rectangular shape when viewed from above, and an opening 42 may be provided along any adjacent two sides (see Figs. 9(A) and (B)). In this embodiment, the closed area 41 is a portion of the upper surface portion 1 and the lower surface portion 2 where two adjacent sides directly contact both side portions 3, 3.

[0048] The portions of the upper surface portion 1 and the lower surface portion 2 that are not in contact with the side surface portions 3, 3 become part of the upper surface portion 1 and the lower surface portion 2, and become portions that protrude horizontally from the opening 42. By making the portions of the upper surface portion 1 and the lower surface portion 2 that protrude from the opening 42 into the upper auxiliary support plate 1a and the lower auxiliary support plate 2a, the supporting housing A in the second embodiment can support the corner portion 91 of the iron plate 9 even more firmly.

[0049] In addition, the pressing end 52 of the lifting lever 5 may have a rough surface 52a. The rough surface 52a may be sawtooth-like (see FIG. 9(C)) or knurled with repeated unevenness (see FIG. 9(D)). By providing the rough surface 52a on the pressing end 52, the corner 91 of the sole plate 9 housed in the support housing A can be firmly fixed by the lifting lever 5. [Explanation of symbols]

[0050] A...Support housing, 1...Top part, 11...Protrusion hole, 2...Bottom part, 21...Drain hole, 3...side portion, 4...storage space portion, 4a...corner portion, 41...closed area portion, 42...opening portion, B: Lifting lever mechanism, 5: Lifting lever, 51: Swing center, 52: Pressing end, 53...lifting end portion, 6...swinging support portion, 9...iron plate, 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 rear joining portion where longitudinal ends of the two side portions join at a right angle, and the lifting lever is freely swingable on a vertical plane with a longitudinal center portion as a swing center portion, A clamp characterized in that one end side in the longitudinal direction as viewed from the swing center is a pressing end portion that protrudes into the support housing, a hole is formed in the top surface portion through which the pressing end portion protrudes, and the other end side in the longitudinal direction as viewed from the swing center is a lifting end portion, and when the lifting end of the lifting lever is in a lifted state, the pressing end portion can protrude into the support housing through the hole, and a discharge hole is formed in the bottom surface portion of the support housing near a corner of the rear mixing portion.

2. 2. The clamp according to claim 1, wherein the discharge hole is formed in a triangular shape having two sides along both of the side surfaces at a corner of the rear joining portion.

3. 2. The clamp according to claim 1, wherein the discharge hole is formed by excluding a corner portion of the innermost intersecting portion of the lower surface portion.

4. 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.

5. 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.

6. 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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