JP6639041B2 - Hanging clamp - Google Patents

Description

The present invention relates to a hanging clamp, and more particularly to a hanging clamp having a tightenable / open lock state switching device that can be installed with a small amount of rearward projection from a clamp body and that can be operated in a space-saving manner.

Various types of suspension clamps used to lift workpieces such as steel plates and steel bars apply an initial tightening force to the workpiece set between the cam and the receiving part (such as a rotating jaw) by the tension of a spring. Further, by projecting the cam into the work insertion port via the link mechanism according to the load acting when the work is lifted, and holding the cam between the receiving portion, the work is securely grasped and lifted. Transport. In the hanging clamp having such a structure, when the work is set, the spring tension is transmitted to the cam to apply the initial tightening force to the work, and when the work is not set, the initial tightening force acts. A switching device for preventing this is adopted.

For example, a switching device (locking device 30) disclosed in Patent Document 1 connects one end of a lock spring (pulling spring) 31 to a pin 32 passing through a base end extension 26 of a cam 18 and clamps the other end. A rear end of the main body 11 is connected to a pin 35 passing near the tip of a latch 34 rotatably attached via a latch bolt 33, and a ring 40 attached to the tip of the latch is raised upward. In the raised state, the tension of the lock spring does not act, so that the cam does not protrude into the work insertion port and remains in the open lock state in which it is buried in the clamp body (FIGS. 1 to 3). A tightenable state in which the tension of the lock spring is transmitted to the cam and an initial tightening force is applied is obtained (FIG. 5).

The switching device disclosed in Patent Literature 1 is incorporated in a vertical suspension clamp, and FIGS. 8 and 9 show configuration examples in which the switching device is applied to a sheet pile suspension clamp. The sheet pile is also referred to as a steel sheet pile, has a hat-shaped or letter-shaped cross-section, and has joints formed at both ends in the longitudinal direction thereof. The sheet piles are connected to each other in a vertically inverted state through the joints. It is often used as a hypothetical sill when constructing seawalls, breakwaters, quays, etc. by burying it in the soil (Fig. 7).

A sheet pile suspension clamp 10 shown in FIGS. 8 and 9 has a joint portion of a work (sheet pile) 1 to be lifted, in which two body plates are connected and fixed by a body bolt 12 with a predetermined space therebetween. A clamp body 11 having a work insertion opening 13 into which the workpiece 2 is inserted is formed. A cam 14 is provided above the work insertion opening 13 so as to be rotatable about a cam bolt 15, and a receiving claw provided below the work insertion opening 13 is provided with a locking claw 16 a for locking the tip of the sheet pile joint 2. The part 16 is fixed to the clamp body 11. A work contact plate 17 is fixed to the back side of the work insertion slot 13.

An L-link 18 is provided rotatably about the main body bolt 12, one end of which is rotatably connected to a lower end of a suspension ring 20 via a suspension ring caulking pin 19, and the other end of which is connected to a link 22 via a link pin 21. It is rotatably connected to one end. The other end of the link 22 is rotatably connected to the cam 14 via a link caulking pin 23. With this link mechanism, when the suspension ring 20 is pulled up, the L link 18 rotates counterclockwise around the main body bolt 12, thereby moving the link 22 downward, so that the cam 14 moves around the cam bolt 15. It rotates counterclockwise in the figure and protrudes toward the work insertion slot 13.

When the switching device described in Patent Literature 1 is applied to the sheet pile hanging clamp 10 having such a configuration, the upper end of the pull spring 24 for applying an initial tightening force to the work is connected to the tip of the link 22 via the pin 25. The lower end thereof is connected via a pin 26 near the tip of a latch 27 rotatably connected to the clamp body 11 with a latch bolt 28, and the operation of an operating ring 29 connected to the tip of the latch 27 is performed. Thus, the switching operation is performed between an open state in which the tension of the pulling spring 24 is not applied to the cam 14 and a tightenable state in which the tension is applied to the cam 14 to apply an initial tightening force. That is, when the operation ring 29 is at the position shown in FIG. 8, the cam 14 is rotated in the direction of protruding to the work insertion opening 13 via the L-link 18 and the link 22 by the tension of the pull spring 24 to initially tighten the work 1. When the latch operation ring 29 is at the position shown in FIG. 9, the tension is not transmitted to the cam 14 because the tension spring 24 is in a completely contracted state. The state where no initial tightening force is applied is maintained (open state). In the open state, the cam 14 is in contact with the upper surface of the joint portion 2 of the work 1 in FIG. 9, but is merely in contact with the cam 14 and the link 22 by its own weight. The cam 14 can be freely protruded and retracted with respect to the clamp body 11 according to the rotation of 27 and the lifting / lowering of the suspension ring 20.

JP 2010-001086 A

The switching device disclosed in Patent Literature 1 protrudes greatly to the rear of the clamp body as shown in the literature, and the same applies to FIGS. 8 and 9 in which this is applied to a sheet pile hanging clamp. As is apparent from FIG. 9 in particular, when the clamp is opened by the switching device, the latch 27 is easily prone to external force because the latch 27 is located at a position protruding greatly behind the clamp body 11.

For example, when the work is lifted, transported and lowered to a predetermined place, and the operation ring 28 is pulled up to an open state (FIG. 9), when the clamp is removed from the work, the clamp is gently handled and an external force is applied to the latch 27. It is good enough not to act, but sometimes the clamp 10 removed from the work is thrown to the ground, and there is a possibility that the latch 27 protruding rearwardly of the clamp body 11 may be damaged. Further, when only the clamp in the open state is lifted and transported by a crane (without holding the work), the latch 27 protruding outside the clamp body 11 collides with a nearby structure such as a steel material. The latch 27 may be damaged. Further, if the tension spring 24 is deformed or damaged by the external force applied to the latch 27 in this manner, the initial tightening force due to the tension of the tension spring 24 is applied to the work as specified in the subsequent lifting and transporting of the work. You can no longer give.

In particular, in the case of the sheet pile suspension clamp or the lateral suspension clamp shown in FIGS. 8 and 9, it is difficult to secure a sufficient space behind the work insertion opening in the clamp body 11. , And the disadvantages described above appear significantly.

Therefore, the problem to be solved by the present invention is to improve the switching device between the lockable state and the open lock state, which is employed in the conventional suspension clamp, and to reduce the amount of protrusion from the clamp body to the rear, and to incorporate it. And a hanging clamp having a switching device which can be operated in a space-saving manner.

In order to achieve this object, the present invention according to claim 1 includes a clamp body having a work insertion port, a cam that can be inserted into and retracted from the work insertion port, a receiving portion that faces the cam with the work insertion port interposed therebetween, and a suspension ring. A link mechanism that transmits the movement of the suspension ring to the cam, and a pull spring that is bridged between the clamp body and the link mechanism. The tension of the pull spring is transmitted to the cam via the link mechanism, and the cam is inserted into the work insertion port. From the workpiece insertion opening through the link mechanism when the suspension ring is lifted up by a crane or the like, thereby providing a clamping force according to the suspension load. In the hanging clamp configured to grip the work with the cam, the cam is projected to the work insertion port with the initial tightening force due to the tension of the tension spring and the tightening force according to the hanging load. An open lock that locks the link mechanism and embeds the cam in the clamp body so as not to apply the initial tightening force due to the tension of the pull spring and the tightening state in which the workpiece can be gripped, and the tightening force according to the hanging load. A switching device for performing a switching operation between the state and the state is incorporated, and the switching device has a distal end projecting inward from an outer surface of the clamp body and a projecting position for restricting the movement of the link mechanism and an outer surface of the clamp body. A lock pin movable between a retracted position that does not protrude inward, a push spring that urges the lock pin toward the protruding position, and a first position that is connected to an outer end of the lock pin and is relative to the body clamp. And a lock lever movable between a second position and a second position. When the lock lever is in the first position, the lock pin is located at the retracted position against the urging force of the push spring. Maintaining the tightening state, the lock lever and maintains the open locked state the locking pin is positioned at the protruding position by the biasing force of the spring-loaded when in the second position.

According to a second aspect of the present invention, in the hanging clamp according to the first aspect, the switching device is further fixed to a housing fixed to an outer surface of the clamp body at a predetermined rotation angle position outside the housing. A lever restricting plate, wherein the lock lever assumes the first position when the lock lever takes the same rotational angle position as the lever restricting plate to maintain the tightenable state, and the lock lever has a different rotational angle position from the lever restricting plate. The second lock position is maintained when taking the lock.

According to a third aspect of the present invention, in the suspension clamp according to the second aspect, a lock pin is provided on the lock lever, and a locking hole capable of locking the lock pin is provided on the lever regulating plate. The lock pin is locked in the locking hole at the position of.

According to the present invention, since the latch is not used as in the switching device described in Patent Document 1, the switching device is configured even when the clamp is in either the tightenable state or the release lock state. Each member hardly projects rearward from the clamp body. Therefore, it is unlikely to be damaged by colliding with the ground or a structure, and a large space is not required behind the clamp body even during the switching operation. Further, since this switching device is not directly related to the pulling spring that applies the initial tightening force, even if the switching device that projects laterally from the clamp body is damaged, the pulling spring is deformed or damaged. I will not let you.

According to the second aspect of the present invention, a more specific and preferable configuration of the switching device is provided. When the lock lever is in the same rotation angle position as the lever restriction plate, it can be tightened, and when the lock lever is in a different rotation angle position from the lever restriction plate, the open lock state is maintained. By a simple operation, the switching operation between the tightenable state and the release lock state can be performed.

According to the third aspect of the present invention, a more specific and preferable configuration of the switching device is provided. When the lock lever takes the same rotation angle position as the lever regulating plate, the lock lever pin enters the locking hole and is locked, thereby preventing the rotation of the lock lever and the movement by the urging force of the pressing spring. The pin can be stopped at the retracted position, the clamp can be reliably maintained in a tightenable state, and the switching operation is easy.

It is a side view which shows the suspension clamp (sheet pile suspension clamp) by one Embodiment of this invention in the state which can be tightened. It is a front view of this hanging clamp. FIG. 2 is a side view showing the position and state of each part in a tightened state by omitting a main body plate and the like on the near side from FIG. 1. It is a principal part perspective view which shows the state in which this suspension clamp can be tightened. It is a side view which shows the position and state of each part in the open lock state of this hanging clamp. It is a principal part perspective view which shows the open lock state of this hanging clamp. It is an explanatory view of a use state which lifts a sheet pile using this suspension clamp, (a) is the whole perspective view, (b) is the cross direction end view, and (c) is the longitudinal direction partial side view. FIG. 9 is a side view of a state in which the switching device of Patent Literature 1 is applied to the hanging clamp in a tightenable state. FIG. 11 is a side view of an open lock state when the switching device of Patent Document 1 is applied to the hanging clamp.

A suspension clamp according to an embodiment of the present invention will be described with reference to FIGS. The hanging clamp according to this embodiment is implemented as a sheet pile hanging clamp 10 used for lifting and transporting a sheet pile (steel sheet pile) using one or more pairs as described later with reference to FIG. I have.

The basic configuration of the sheet pile hanging clamp 10 is substantially the same as the configuration shown in FIGS. That is, a link mechanism having an L link 18 and a link 22 is provided on a clamp body 11 having a work insertion port 13 into which a joint portion 2 of a work (sheet pile) 1 is inserted. The link 18 rotates counterclockwise in the figure around the main body bolt 12, thereby moving the link 22 downward. The cam 14 rotates counterclockwise in the figure around the cam bolt 15, and Extrude toward it.

The sheet pile suspension clamp 10 transmits the tension of the pulling spring 24 to the cam 14 and projects the cam 14 to the work insertion opening 13 to provide an initial tightening force to the work (see FIGS. 1 to 4). An open lock state (FIGS. 5 and 6) in which the tension by the extension spring 24 is not transmitted to the cam 14 and the cam 14 is maintained at a position substantially buried in the clamp body 11 without projecting to the work insertion opening 13. The configuration and operation of the switching device 30 for switching between the above and the above are different from the previously described sheet pile suspension clamp 10 shown in FIGS. 8 and 9.

The switching device 30 has a cylindrical housing 31 fixed to the outer surface of one (left side in FIG. 2) main body plate 11a, and has an axial length larger than the cylindrical housing 31 and is axially movable into the cylindrical housing 31. , A pressing spring 33 that urges the locking pin 32 in a direction to protrude inward of the main body plate 11 a (inside of the clamp main body 11), and a predetermined rotation angle from the outer surface of the cylindrical housing 31. It has a lever regulating plate 34 fixed so as to protrude at a position, and a lock lever 35 fixed to the tip of a lock pin 32 protruding from the outer end of the cylindrical housing 31. The lock lever 35 has lock lever pins 36 at both ends, and the tip of the lock lever pin 36 can be locked in locking holes 37 opened at both ends of the lever restricting plate 34 (FIG. 4).

When the sheet pile suspension clamp 10 is in a tightenable state (FIGS. 1 to 4), the lock lever 35 is at the same rotation angle position as the lever restriction plate 34, and the lock lever pin 36 is engaged with the lever restriction plate 34. In the state where the lock lever 35 is locked in the stop hole 37, the lock lever 35 is positioned away from the main body plate 11a against the spring force of the pressing spring 33 (FIG. 4). At this time, the inner end of the lock pin 32 housed in the cylindrical housing 31 stays within the thickness range of the main body plate 11a and does not protrude into the space between the other main body plate 11b. And the movement of the link 22 is not hindered. In this tightenable state, the L-link 18 rotates counterclockwise in FIG. 1 around the main body bolt 12 under the tension of the pull spring 24, and the cam 14 is moved in the same direction around the cam bolt 15 through the link 22. , An initial tightening force is applied to the work inserted into the work insertion slot 13. In this state, the cam 14 is lifted by a crane via the suspension ring 20, so that the cam 14 bites into the work surface with a tightening force corresponding to the load of the work 1 and the clamp 10, and is gripped between the cam 14 and the receiving portion 16. Thus, the work 1 can be safely lifted.

The lifting state at this time is shown in FIG. As shown in the drawing, the sheet pile suspension clamps 10 are used in pairs, each of which is set on the joint portion 2 of the sheet pile 1 to be lifted, and the initial state by the tension of the tension spring 24 in the tightenable state described above. After the tightening force is applied, the sling 3 is passed through the sling 3 of the hanging ring 20 of each sheet pile hanging clamp 10 and lifted and transported by a crane (not shown). Since the receiving portion 16 of the sheet pile hanging clamp 10 has the locking claw 16a for locking the tip of the joint portion 2 of the sheet pile 1, as shown in FIG. And can be held between the cam 14 and the danger of falling.

FIGS. 5 and 6 show an open lock state in which the cam 14 does not protrude into the work insertion opening 13 and maintains a position substantially buried in the clamp body 11. In this state, the lock lever 35 is at a rotation angle position different from that of the lever restricting plate 34, so that the lock lever pin 36 of the lock lever 35 cannot enter the locking hole 37 of the lever restricting plate 34. As a result, the lock pin 32 moves rightward in FIG. 2 under the urging force of the pressing spring 33, and its tip projects beyond the main body plate 11 a into the clamp main body 11. And restricts its counterclockwise rotation (FIG. 5). Therefore, even if the link 22 attempts to move downward due to the tension of the extension spring 24, the movement is prevented by the lock pin 32, and the cam 14 is substantially accommodated in the clamp body 11 without projecting to the work insertion opening 13. In the locked position (open lock state).

When switching the sheet pile suspension clamp 10 from the tightenable state (FIGS. 3 and 4) to the open lock state (FIGS. 5 and 6), the lock lever 35 in the state of FIG. The lock lever pin 36 is once moved in a direction to further pull it away from the main body plate 11a, thereby disengaging the lock lever pin 36 from the locking hole 37 of the lever control plate 34, and then slightly rotating in either direction to release the lever control plate 34. The hand is released from the lock lever 35 as a rotation angle position different from the above. As a result, the lock lever 35 moves in the direction approaching the main body plate 11 a by the spring force of the pressing spring 33 to cause the tip of the lock pin 32 to protrude into the clamp main body 11. Since the link 22 is located at the position where it interferes (FIG. 3), the tip of the lock pin 32 is pressed against the upper end side surface of the link 22 and stops at that position. From this state, the suspension ring 20 is pushed down to move the link 22 upward via the L-link 18, whereby the position regulation by the upper end side surface of the link 22 is eliminated, and the lock pin 32 is further moved by the spring force of the push spring 33. 11 protrudes inside and locks the lower edge of the link 22, so that its downward movement is prevented, and the open lock state is maintained.

When switching from the open lock state to the tightenable state, the lock lever 35 in the state of FIG. 6 is largely moved in the direction of being pulled away from the main body plate 11a against the spring force of the push spring 33, and the lock lever pin 36 After the tip has reached the position beyond the lever restricting plate 34, it is only necessary to release the hand from the lock lever 35 in a state where it is rotated in any direction so that its rotational angle position matches the lever restricting plate 34. As a result, the lock lever 35 moves in the direction approaching the main body plate 11a by the spring force of the pressing spring 33, and the tip of the lock lever pin 36 enters the locking hole 37 of the lever regulating plate 34, thereby obtaining a tightenable state. .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the invention defined in the claims.

1 work (sheet pile)
2 Joint part 3 Sling 10 Suspension clamp (Sheet pile suspension clamp)
Reference Signs List 11 clamp body 11a, 11b body plate 12 body bolt 13 work insertion opening 14 cam 15 cam bolt 16 receiving portion 16a locking claw 17 work abutment plate 18 L link 19 suspension ring caulking pin 20 suspension ring 21 link pin 22 link 23 link caulking pin 24 extension spring 25 Pin 26 Pin 27 Latch 28 Latch bolt 29 Operation ring 30 Switching device 31 Cylindrical housing 32 Lock pin 33 Push spring 34 Lever regulating plate 35 Lock lever 36 Lock lever pin 37 Lock hole

Claims (3)

A clamp body having a work insertion opening, a cam capable of being inserted into and retracted from the work insertion opening, a receiving portion facing the cam across the work insertion opening, a suspension ring, a link mechanism for transmitting the movement of the suspension ring to the cam, and a clamp body. And a tension spring that is bridged between the link mechanism and the tension force of the tension spring is transmitted to the cam through the link mechanism to cause the cam to protrude from the work insertion port, thereby applying an initial tightening force to the work. , in the produced suspension clamp to hold the workpiece in clamping force corresponding to the load hanging by protruding cam from the work insertion port through a link mechanism when Tsuwa is pulled by a crane or the like, pull spring With the initial tightening force due to the tension of the work and the tightening force according to the suspended load, the cam is projected into the work insertion port to enable the work to be gripped. A switching device is incorporated to switch between the open lock state where the link mechanism is locked and the cam is buried in the clamp body so that the initial tightening force by force and the tightening force according to the hanging load are not applied. The switching device has a lock movable between a protruding position in which a tip of the switching device protrudes inward from an outer surface of the clamp body to restrict the movement of the link mechanism and a retracted position in which the protruding portion does not protrude inward from the outer surface of the clamp body. A pin, a push spring for urging the lock pin toward the projecting position, and a lock coupled to an outer end of the lock pin and movable between a first position and a second position with respect to the main body clamp. A lock lever is located at the first position, the lock pin is positioned at the retracted position against the urging force of the pressing spring to maintain the tightenable state, and the lock lever is moved to the second position. Hanging clamp and maintains the open locked state to position the locking pin in the protruding position by the biasing force of the spring-loaded to a certain time. The switching device further includes a housing fixed to the outer surface of the clamp body, and a lever regulating plate fixed to the outside of the housing at a predetermined rotation angle position, wherein the lock lever has the same rotation angle position as the lever regulation plate. When the lock lever takes the rotation angle position different from the lever regulating plate, the second position is maintained and the open lock state is maintained. The hanging clamp according to claim 1, wherein the hanging clamp is provided. A lock lever pin is provided on the lock lever , a lock hole for locking the lock lever pin is provided on the lever regulating plate, and the lock lever pin is locked in the lock hole at the first position. The suspension clamp according to claim 2, characterized in that: