JP6324195B2 - Horizontal clamp - Google Patents

Description

The present invention relates to a clamp, and more particularly, to a workpiece slip prevention device that can effectively prevent a workpiece from slipping in an intact clamp for lateral suspension.

A clamp used to lift a workpiece such as a steel plate is generally composed of a cam tooth provided on one leg and a tip of a jaw provided on the other leg inserted into an opening between a pair of legs. The workpiece is lifted in the state of being gripped with the mountain (teeth), but according to the clamp with this structure, the gripping surface of the workpiece bites into the cam teeth and the ridge, and the workpiece is gripped and scratched. It was necessary to repair the grab wound after transporting it to a predetermined place. In addition, there is a concern that the gripping scratches may adversely affect the internal structure of the metal material of the workpiece and cause the strength of the portion to deteriorate.

In order to solve or alleviate this problem, a type of clamp (undamaged clamp) has been developed in which a workpiece is gripped on a substantially flat surface between members without teeth (Patent Documents 1 and 2 below). By using an intact clamp, the workpiece can be lifted without being scratched, or can be easily repaired even if a grip is scratched, and strength deterioration can be suppressed to a level that has no substantial effect. it can. Since such an intact clamp has a weaker gripping force on the workpiece than a normal clamp that lifts the workpiece with the cam teeth and turning ridges caught in the workpiece, a workpiece slip-off prevention device is attached and the workpiece is dropped. Accidents are prevented (Patent Document 2 below).

JP-A 61-27892 JP 2007-76806 A

The workpiece slip prevention device described in Patent Document 2 can instantly respond when a workpiece, which is inserted into the clamp slot and lifted and transported, slides down a certain amount, and exhibits a slip prevention function. Although it is highly safe, it is applied to an intact clamp for vertical suspension in which a workpiece is lifted while being held in a substantially vertical direction. There has been almost no development of an intact clamp for side suspension that lifts a workpiece while holding it in a substantially horizontal direction, and a workpiece slip prevention device applicable to this is unknown.

Therefore, the problem to be solved by the present invention is to propose a novel structure of a lateral suspension clamp and to provide a workpiece sliding prevention device that is particularly applicable to a lateral suspension clamp.

In order to solve this problem, the present invention according to claim 1 inserts a workpiece into an opening formed in a substantially horizontal direction, places the lower surface thereof on a metal plate, presses the upper surface with a pressing cam, and hangs it. When the ring is pulled up, the holding cam is rotated through the link in the direction that protrudes toward the opening, and the workpiece is clamped and lifted by the clamp. A stopper cam that is rotatably provided independently of the cam, and a slip that has an engagement portion that can contact the top surface of the tip of the work inserted in the opening at one end and the other end rotatably connected to the clamp body receiving a detection lever, and biasing means for biasing the engaging teeth of the stopper cam in a direction to project toward the opening, the biasing force of the biasing means when the slip detecting lever is rotated in a predetermined direction Operating means for rotating the stopper cam in a predetermined direction to project the engaging teeth toward the opening, and when the work tip is inserted to a predetermined position in the opening, the engaging portion of the slip detection lever is The stopper cam is held at a position where the engaging teeth do not protrude from the opening against the urging force of the urging means by contacting the top surface of the tip, and the slip detection lever when the work tip is separated from the bottom of the opening by a predetermined distance. When the slippage detecting lever rotates in the predetermined direction with the engaging portion of the workpiece being separated from the top surface of the workpiece tip, the stopper cam is rotated in the predetermined direction via the operating means and the biasing means, and the engaging teeth are directed toward the opening. is projected, so bite the engaging teeth on the workpiece leading end upper surface is intended to prevent the sliding of the workpiece, further, the receiving gold at one end is provided to be rotated relative to the clamp body An opening adjusting lever provided rotatably, an opening adjusting bolt threaded through a screw piece rotatably provided at the other end of the opening adjusting lever, an operating means for rotating the opening adjusting bolt, and a direction of increasing the opening width A width determining plate that engages with the opening adjusting lever at a predetermined rotational position of the opening adjusting lever when the opening adjusting lever is rotated and defines a maximum opening width corresponding to the maximum plate thickness of the workpiece applicable to the clamp; It is the clamp for horizontal suspension characterized by including the opening adjustment mechanism which has these .

According to the first aspect of the present invention, there is provided a configuration suitable as a lateral suspension clamp, particularly as a lateral suspension intact clamp. According to this lateral suspension clamp, when the workpiece slips when the workpiece is being lifted by the opening and the insertion end is separated from the bottom of the opening by a certain amount or more, the engagement portion of the slip detection lever is moved to the workpiece. By separating from the top surface of the tip, this can be detected and responded instantaneously, and the engaging teeth of the stopper cam can be bitten into the top surface of the workpiece, so that there is an effect of reliably preventing the workpiece from sliding down.

Further, there is an effect that the opening width can be adjusted according to the thickness of the workpiece by a simple operation via the opening adjusting mechanism.

Also, by providing a bolt loosening prevention spring, the axial position of the opening adjustment bolt can be prevented from inadvertently moving, so the opening width adjusted according to the thickness of the workpiece is maintained, and There is an effect that the workpiece can be securely pressed between the two.

It is a front view which shows the intact clamp for horizontal suspension in which the workpiece sliding prevention apparatus by one Embodiment of this invention was integrated. It is a right view of this unwound clamp for horizontal suspension. It is a left side view of this intact hanging clamp. It is a disassembled perspective view of this intact hanging clamp. It is a front view which shows each shape and connection structure of a link and a pressing cam in this uninjured clamp for horizontal suspension. It is a front view which shows each shape, connection structure, and operation | movement of the action | operation link and stopper cam in this intact suspending clamp. It is a front view which shows the structure of the receiving member in this intact undamaged clamp. It is explanatory drawing which shows the operation process 1 at the time of lifting a workpiece | work using this intact suspending clamp. It is explanatory drawing which shows the operation process 2 performed following the operation process 1 of FIG. It is explanatory drawing which shows the operation process 3 performed following the operation process 2 of FIG. It is explanatory drawing which shows the operation process 4 performed following the operation process 3 of FIG. It is explanatory drawing which shows the operation process 5 performed following the operation process 4 of FIG.

With reference to FIG. 1 thru | or 4, the structure of the intact clamp 10 for horizontal suspension by one Embodiment of this invention is demonstrated. The main body 11 of the laterally suspending intact clamp 10 has a pair of side plates that are spaced apart and opposed to each other. The clamp body 11 is formed in a substantially U-shape when viewed from the front, and an opening 14 for inserting a workpiece is formed between the leg portion 12 protruding from the lower end and the upper portion 13.

The upper portion 13 of the clamp body 11 accommodates an L link 16 that is rotatable around a body bolt 15 (passed from one side of the clamp body 11 and fastened with a nut 60 on the opposite side). A suspension ring 18 is rotatably connected to the other end via a suspension ring pin 17, and a link 20 is rotatably connected to the other end via an L link pin 19. A holding cam 22 is rotatably connected to the other end of the link 20 via a caulking pin 21 (FIG. 5). The holding cam 22 can rotate around the cam pin 23. When the holding cam 22 is lifted by a crane or the like (not shown) via the suspension ring 18 in the state shown in FIG. 11 described later, the cam pin 23 is connected via the L link 16 and the link 20. 1 is rotated counterclockwise in FIG. 1 so as to protrude from the upper clamp body upper part 13 toward the opening 14, and the work pressing surface 22 a is brought into contact with the upper surface of the end of the work W inserted into the opening 14. it can.

A stopper cam 24 is rotatably provided on the cam pin 23 together with the pressing cam 22, and an engagement tooth 25 is formed at the tip thereof. In this embodiment, the stopper cam 24 is provided so as to be positioned on both sides of the pressing cam 22 (FIG. 4).

As will be described later, a clamp opening / closing handle 26 incorporated in the clamp 10 in order to lock and unlock the clamp 10 in an inoperative state is fixed to a handle plate 27 disposed on the outside of the clamp body 11 and the tip thereof. And a crank cam 30 that is secured to the handle plate 27 by a spring pin 29 and is disposed inside the clamp body 11 and rotates integrally with the handle plate 27.

The crank cam 30 has a small-diameter portion 30a having a constant diameter and a large-diameter portion 30b formed to have a larger diameter over a predetermined angle range, and between the small-diameter portion 30a and the large-diameter portion 30b. The step portions become engagement step portions 57 and 58 and engage with a stopper 59 fixed to the inside of the clamp body 11 to define the rotation angle range of the crank cam 30.

Further, a caulking pin 33 is provided at the end of the stopper cam 24 opposite to the engaging tooth 25, and one end of a tension spring 34 is connected to the caulking pin 33, and the other end of the tension spring 34 is connected to the crank cam 30. It is connected to an eccentric pin 31 that protrudes toward the inside of the clamp body 11 and is prevented from coming off by a spring pin 32.

One end of an operating link 35 is rotatably connected to the caulking pin 33, and one end of a slip detection lever 36 is rotatably connected to the other end. A connecting pin 37 is fixed to the other end of the slip detection lever 36 to ensure a predetermined interval in the slip detection lever 36. The slip detection lever 36 is provided such that a hexagon socket head bolt 38 provided so as to penetrate from the one side of the clamp body 11 to the other side passes through an insertion hole 39 formed near the connecting pin 37. The hexagon socket head bolt 38 can be rotated within a predetermined angle range described later.

An opening adjusting mechanism 40 is provided at the end of the clamp body 11 opposite to the opening 14. The opening adjustment mechanism 40 rotates the opening adjustment lever 50 provided on the leg 12 facing the work pressing surface 22a of the pressing cam 22 across the opening 14 with respect to the clamp body 11 around the lever pin 51. A receiving metal 53 provided rotatably at the tip of the opening adjusting lever 50 around the caulking pin 52 is moved up and down to adjust the opening width between the work pressing surface 22a and the thickness of the work W. . A screw piece 54 is rotatably disposed above the rear end of the opening adjustment lever 50, and the tip of the opening adjustment bolt 41 is threaded through the screw piece 54. The other end of the opening adjustment bolt 41 is inserted through a trunnion 64 fixed to the rear of the clamp body 11, and is screwed to the nut 44 via the washer 43 on the outside of the clamp body 11. The opening adjusting bolt 41 and the nut 44 are configured to rotate integrally. A push spring 42 is provided between the trunnion 64 and the washer 43 around the opening adjustment bolt 41.

Further, the handle 47 can be mounted by inserting a square shaft 46 integrally fixed to the outside of the nut 44 into a square hole 48 formed at one end of the handle 47 (not shown in FIG. 1). Accordingly, by rotating the handle 47 with the operation knob 49 fixed to the other end of the handle 47, the opening adjustment lever 50 is rotated about the lever pin 51 through the screwing of the opening adjustment bolt 41 and the screw piece 54. The opening width can be adjusted by rotating the receiving metal 53 around the caulking pin 52. That is, the members related to the handle 47 including the operation knob 49 constitute operation means for adjusting the opening by rotating the opening adjusting bolt 41. The pressing spring 42 functions to prevent the opening adjustment bolt 41 from loosening and to maintain the adjusted opening width.

An engagement step portion 55 is formed below the rear end side of the opening adjustment lever 50, and the opening adjustment lever 50 is operated by screwing the opening adjustment bolt 41 and the screw piece 54 by rotating the handle 47 counterclockwise. Is rotated clockwise around the lever pin 51, it engages with a width determining plate 56 fixed to the rear of the clamp body 11 to restrict further rotation. A state in which the engaging step portion 55 is engaged with the width determining plate 56 is shown in FIG. 1 and FIG. 8, and gives the maximum opening width Tmax as will be described later with reference to FIG.

1 to 3 are maintained in a state where the pressing cam 22 does not protrude into the opening 14 but is buried in the upper portion 13 of the clamp body (hereinafter referred to as “clamp open state”). Is shown as being. At this time, the clamp opening / closing handle 26 stops at the position rotated most counterclockwise, and the engagement step portion 57 of the crank cam 30 is engaged with the stopper 59 and maintained at the same position. Since the center of the tension spring 34 is located above the center of the crank cam large diameter portion 30b, the tension of the tension spring 34 does not work. Further, since the tip of the stopper cam 24 is in contact with the lower surface of the engagement step portion 20a of the link 20, the link 20 cannot move downward from this position. This position is maintained, and the pressing cam 22 does not protrude toward the opening 14 and maintains the position buried in the upper part 13 of the clamp body.

When the clamp opening / closing handle 26 is slightly rotated clockwise from this clamp open state and the center of the tension spring 34 is moved downward from the center of the crank cam large diameter portion 30b, the stopper cam 24 becomes rotatable. The link 20 can also move, and when the suspension ring 18 is pulled up, the pressing cam 22 can be projected toward the opening 14 via the link 20 . As a result, the clamp 10 shifts from the open state to the operating state, and the workpiece W can be lifted as shown in FIG.

In FIG. 4, reference numeral 61 denotes a spring pin for preventing the nut 60 from falling off, reference numeral 62 denotes a spring pin for preventing the lever pin 51 from falling off, and reference numeral 63 denotes a spring pin for preventing the cam pin 23 from falling off. Moreover, in FIG. 1 thru | or FIG. 3, the code | symbol 65 shows the reinforcement board welded and fixed to the outer side of each side plate of the clamp main body 11. FIG.

The operation and usage of the horizontally suspended intact clamp 10 configured as described above will be described with reference to FIGS. As a premise, the clamp opening / closing handle 26 is in the rotational position of FIG. 1, and the horizontal hanging intact clamp 10 is maintained in the above-described open state.

First, the opening width between the work pressing surface 22a of the pressing cam 22 and the receiving metal 53 of the opening adjusting lever 50 is adjusted via the opening adjusting mechanism 40 in accordance with the thickness of the work W to be lifted. . In this operation, first, the handle 47 is attached to the square shaft 46 of the opening adjustment bolt 41 and is turned in a predetermined direction (in this embodiment, counterclockwise direction = arrow A direction in FIG. 8). The opening adjusting lever 50 is rotated clockwise around the pin 51 (in FIGS. 1 to 3 and FIGS. 8 to 12. The same applies to the following unless otherwise specified) via screwing with the pin 51. Is moved in a direction to be buried in the leg 12. FIG. 1 and FIG. 8 show a state where the receiving opening 53 is moved to the lowest position in this way and the maximum opening width Tmax is given to the lower edge 13a of the clamp main body upper end portion 13. At this time, there is a slight gap between the washer 43 and the trunnion 64. The clamp 10 can be applied to a workpiece W having a thickness less than the maximum opening width Tmax.

In this state, the workpiece W is inserted until it hits the back 14a of the opening 14 (FIG. 9). Then, when the handle 47 is turned in the opposite direction (in this embodiment, the clockwise direction = the direction of arrow B in FIG. 10), the opening adjustment lever 50 causes the pin 51 to move through the screwing of the opening adjustment bolt 41 and the screw piece 54. As the center rotates counterclockwise, the receiving metal 53 gradually rises to narrow the opening width. In this way, the work upper surface Wa is brought into close contact with the lower edge 13a of the clamp main body upper end portion 13 and the work lower surface Wb is brought into close contact with the receiving metal 53 so that the work W is sandwiched therebetween (FIG. 10). . As the handle 47 is rotated, the nut 44 and the washer 43 gradually approach the trunnion 64 against the tension of the push spring 42, and finally the gap between the washer 43 and the trunnion 64 disappears and is in close contact. Thus, the work W is pressed and clamped between the clamp body lower edge 13 a and the receiving metal 53 by applying the tension of the push spring 42. The opening adjusting mechanism 40 rotates the opening adjusting lever 50 around the pin 51. However, since the receiver 53 is rotatable around the caulking pin 52, the state is changed from the state shown in FIG. 9 to the state shown in FIG. In addition, the receiving metal 53 automatically rotates while coming into contact with the work lower surface Wb and comes into close contact with the work lower surface Wb.

As described above, the opening width adjustment work by the opening width adjusting mechanism 40 is completed, and a state in which the workpiece W is sandwiched and held between the lower edge 13a of the clamp body and the receiving metal 53 is obtained, so the handle 47 is removed. Further, the clamp opening / closing handle 26 is rotated clockwise from the position shown in FIG. 10 (shown by a two-dot chain line in FIG. 11) to shift the clamp 10 from the open state to the operating state (FIG. 11). As described above, since the presser cam 22 is rotated in the protruding direction toward the opening 14 via the link 20 when lifted via the suspension ring 18, the work W is firmly gripped with the presser foot 53. can do. At this time, the stopper cam 24 also tries to protrude toward the opening 14 under the tension of the pulling spring 34, but the tip engaging portion 36a of the slip detection lever 36 is in contact with the workpiece upper surface Wa, so that it is in a normal lifting state. As long as this is maintained, the slip detection lever 36 cannot rotate clockwise from this position, so that the stopper cam 24 does not protrude toward the opening 14 and remains buried in the upper portion 13 of the clamp body. To do.

However, as shown in FIG. 12, if the workpiece W slips and the gap X between the opening depth 14a is more than a certain level, the tip engagement portion 36a of the slip detection lever 36 does not contact the workpiece upper surface Wa. The stopper cam 24 projects toward the opening 14 under the tension of the tension spring 34. As a result, the engaging teeth 25 of the stopper cam 24 bite into the workpiece upper surface Wa to prevent the workpiece W from sliding down. According to this configuration, when the tip of the workpiece W moves away from the opening depth 14a by a certain amount or more, the stopper cam 24 instantaneously bites into the workpiece upper surface Wa due to the tension of the pulling spring 34. It can be reliably prevented. The clockwise rotation position of the clamp opening / closing handle 26 when the transition of the clamp 10 from the open state to the operating state is completed exceeds the clockwise rotation position when the stopper cam 24 protrudes to the maximum extent in the opening 14. This is the position when the engagement step portion 57 of the lock cam 30 is engaged with the stopper 59 by further rotating in the same direction, and further rotation in the same direction is restricted.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to this, and various modifications can be made within the scope of the invention defined in the claims.

DESCRIPTION OF SYMBOLS 10 Side suspension intact clamp 11 Clamp body 12 Leg part 13 Upper part 13a Lower edge 14 Opening 14a Back 15 Body bolt 16 L link 17 Suspension ring pin 18 Suspension ring 19 L link pin 20 Link 20a Engagement step part 21 Caulking pin 22 Pressing cam 22a Workpiece pressing surface 23 Cam pin 24 Stopper cam 25 Engagement tooth 26 Clamp opening / closing handle 27 Handle plate 28 Knob 29 Spring pin 30 Crank cam 31 Eccentric pin 32 Spring pin 33 Caulking pin 34 Retraction spring (biasing means)
35 Actuation link (actuation means)
36 Slip detection lever 36a Engagement part 37 Connection pin 38 Hexagon socket head bolt 39 Insertion hole 40 Opening adjustment mechanism 41 Opening adjustment bolt 42 Push spring (Bolt loosening prevention spring)
43 Washer 44 Nut 45 Set screw 46 Square shaft 47 Handle (operating means)
48 Square hole 49 Operation knob 50 Opening adjustment lever 51 Lever pin 52 Caulking pin 53 Receptacle 54 Screw piece 55 Engagement step part 56 Width determining plate 57 Engagement step part 58 Engagement step part 59 Stopper 60 Nut 61 Spring pin 62 Spring pin 63 Spring Pin 64 Trunnion 65 Reinforcement plate

Claims (1)

Insert the workpiece into the opening formed in a substantially horizontal direction, place the lower surface on the metal, press the upper surface with the pressing cam, and when lifting the lifting ring, point the pressing cam to the opening via the link In the clamp of the type that tightens and lifts the workpiece with the receiving metal by rotating it in the protruding direction, a stopper cam provided on the cam pin that is the rotation center of the pressing cam and capable of rotating independently of the pressing cam, and an opening A slip detection lever that has an engagement portion that can contact the top surface of the tip of the workpiece inserted in the end and is rotatably connected to the clamp body at the other end, and the engagement teeth of the stopper cam project toward the opening Urging means for urging in the direction to be moved, and when the slip detection lever rotates in a predetermined direction, the urging force of the urging means is received to rotate the stopper cam in the predetermined direction to Operating means for projecting toward the mouth, and when the work tip is inserted to a predetermined position in the opening, the engaging portion of the slip detection lever comes into contact with the top surface of the work tip, thereby On the other hand, the stopper cam is held at a position where the engagement teeth do not protrude from the opening, and when the workpiece tip is separated from the bottom of the opening by a predetermined distance, the slip detection lever engagement portion is separated from the workpiece top surface. Is rotated in the predetermined direction, the stopper cam is rotated in the predetermined direction via the actuating means and the biasing means so that the engaging teeth protrude toward the opening, and the engaging teeth are bitten into the top surface of the workpiece tip. Te is intended to prevent the sliding of the workpiece, further, the opening control lever, wherein the receiving gold at one end of provided rotatably relative to the clamp body is provided rotatably, an opening adjustment Les An opening adjustment bolt that is threaded through a screw piece that is rotatably provided at the other end, an operating means that rotates the opening adjustment bolt, and an opening adjustment lever that is used when the opening adjustment lever is rotated in the direction of increasing the opening width. An opening adjusting mechanism having a width determining plate that engages with an opening adjusting lever at a predetermined rotational position and defines a maximum opening width corresponding to a maximum plate thickness of a workpiece applicable to the clamp. Clamp for horizontal suspension.