JPH0217474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp, and more particularly to a hanging fixture that clamps a concrete U-shaped groove from both sides and hangs it on a hook suspended from a crane.

The conventional clamp used for lifting concrete U-shaped grooves has an L-shaped body consisting of a horizontal beam part and a fixed leg that hangs down from one end of this part and has a cam member attached to the lower end, and the length of the horizontal beam part is The upper end is rotatably attached to the intermediate part via a pin, the lower end is positioned opposite to the lower end of the fixed leg, and the movable leg is shaped like a "dog" and has a jaw that cooperates with the cam member. A mechanism for adjusting the angle of the movable leg with respect to the body is provided, which is a screw rod rotatably attached to the horizontal beam of the movable leg and screwed into a female thread member on the movable leg. In such conventional clamps, when the side walls on both sides of the U-shaped groove are formed as simple vertical surfaces, first, the cam member at the lower end of the fixed leg and the jaw at the lower end of the movable leg are connected to one side wall of the U-shaped groove. and the movable leg is rotated relative to the fixed leg until the cam member and the jaws respectively contact the opposing side wall, provided that the cam member is held in the inoperative position. do. After that, once the cam member is brought into the operating position, it can be easily lifted up by gripping the U-shaped groove. After transporting one U-shaped groove to the desired point, by returning the cam member to the non-operating position, not only can the fixed leg and movable leg be easily removed from the U-shaped groove, but also the fixed leg can be removed from the U-shaped groove easily. Holding the and movable legs in the same relative position, the lifting can be repeated by carrying the lift to a position where it clamps another U-shaped groove and repeating the same procedure as before. However, in large U-shaped grooves that have recently been commercially available, thickened portions are provided along the upper edges of both side walls for reinforcement, and overhang portions that protrude outward from the normal side walls are formed. When using a conventional clamp with such a large U-shaped groove, each time an individual U-shaped groove is lifted, the fixed leg and movable leg are widened using a screw mechanism, and the lower ends of both are thickened. , the lower ends of both legs must again be brought into contact with the normal side walls of the U-groove using screws. Furthermore, when removing the clamp, the fixed leg and the movable leg must be spread out to the extent that their lower ends can pass through the thick walled portion. Thus, each time a conventional clamp is used in a modern large U-groove, it consumes considerable effort and time, reduces work efficiency, and ultimately makes the lifting operation more expensive. The present invention helps to solve this type of problem that occurs with previous clamps used for U-groove lifting.

The object of the present invention is to insert the fuselage between the horizontal beam part and the movable leg, to be rotatably attached to the horizontal beam part together with the movable leg by a common rotation pin, and to be placed at a predetermined position with respect to the horizontal beam part. When the cam member at the lower end of the fixed leg and the jaw at the lower end of the movable leg are
Adjustment to separate the cam member and the jaw to an extent that allows the cam member and the jaw to pass through the outside of the overhanging portion of the upper end of the U-shaped groove when the cam member is placed in a use position facing the side wall of the U-shaped groove and rotated from a predetermined position around the pivot pin. To provide a clamp that is equipped with a plate and eliminates the use of a screw rod when sequentially lifting a large number of U-shaped grooves of the same size.

The above object of the present invention is to provide an L-shaped body consisting of a horizontal beam part and a fixed leg that hangs down from one end of the part and has a cam member attached to the lower end, and a pin in the middle part of the length of the horizontal beam part. The clamp is provided with a "dog"-shaped movable leg having an upper end rotatably attached to the fixed leg and a lower end facing the lower end of the fixed leg and having a jaw that cooperates with the cam member. An adjustment plate is inserted between the horizontal beam portion and the movable leg and rotatably attached to the horizontal beam portion together with the movable leg by the pin, and the horizontal beam portion sets the adjustment plate at a predetermined angle with respect to the horizontal beam portion. It is equipped with a locking mechanism to hold the movable leg in position, and is further equipped with an angular position adjustment mechanism for the movable leg with respect to the regulation plate, such as a threaded rod that is rotatably attached to the adjustment plate and screwed into a female screw member attached to the movable leg. This is achieved by the clamp of the present invention.

Embodiments of the apparatus of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a conventional clamp 50 used for lifting concrete U-shaped grooves.

The clamp 50 is composed of an L-shaped body 51 and a dogleg-shaped movable leg 52 whose one end is rotatably attached by a pin 53 to a position adjacent to a corner of the body. The body 51 includes a horizontal beam portion 51A and a fixed leg portion 51B hanging from the right end thereof. The fixed leg 51B and the movable leg 52 have their lower ends placed on the same level and facing each other. Fixed leg 5
1B is equipped with a cam member 55 at the lower end, the movable leg 52 is equipped with a jaw 56 at the lower end, and the cam member 55 and jaw 56 cooperate to clamp the concrete U-shaped groove W1.
A screw rod 54 equipped with a handle 59 is rotatably attached to the horizontal beam portion 51A of the body 51 via a support fitting 60, and is screwed into a female screw member (not shown) attached to the movable leg 52. There is. By rotating the screw rod 54, the movable leg 52 is moved through the female screw member.
is rotated around the pin 53, and the jaw 5 at the lower end
6 to approach or separate from the other cam member 55. Reference numeral 58 indicates a mechanism for locking the cam member 55 in the use position, whereby the cam member 55 is placed in the non-use position when unlocked. 57 indicates a shackle that is hung on the hook of the crane.

Figure 2a shows a conventional U with smooth vertical walls on both sides.
Fig. 2b shows a large U-shaped groove W2 with outwardly projecting portions 62 due to the thickened portions 61 provided at the upper edges of the side walls on both sides.

In the clamp 50 of FIG. 1, when hanging the conventional U-shaped groove W1, the cam member 55 and the jaw 56 placed in the unlocked position face one side wall and the other side wall of the U-shaped groove W1, respectively. Screw rod 5 so that it is placed in position
4 to adjust the position of the movable legs 52 relative to the body 51. In such a case, the cam member 55 and the jaw 56 placed in the non-operating position are brought into contact with both sides of the upper end of the U-shaped groove W1, and when the clamp 50 is lowered, the cam member 55 and the jaw 56 are brought into contact with the U-shaped groove W1 at a desired level. Groove W1
It can be placed in a position where it is interposed. Therefore, when the cam member 55 is rotated counterclockwise around the pin 63, the cam member 55 cooperates with the jaws 56 to grip the U-shaped groove W1 and lift it up. After carrying the U-shaped groove W1 to the destination point,
The clamp 50 can be removed from the U-shaped groove W1 by lowering it to the ground and unlocking the cam member 55. Once removed, the clamp 50 can be easily fitted into another U-shaped groove W1 to lift a large number of U-shaped grooves W1 one after another. At this time, the movable arm 5
2 and the body 51.
There is no need to activate 4.

However, the clamp 50 of FIG.
When suspending the U-shaped groove W2 in figure b, the operation becomes complicated. In this case, first, the cam member 55 and jaw 56 of the clamp 50 are connected to the projecting portions 6 on both sides of the U-shaped groove W2.
The distance must be such that it can pass outside of 2. When the cam member 55 and the jaw 56 pass through the overhanging portions 62 on both sides and descend to the desired level, the screw rod 54 is used until the cam member 55 and the jaw 56 respectively contact the sides of the U-shaped groove W2. Both must be brought closer to each other. After lifting the U-shaped groove W2, remove the cam member 5 by reversing the above procedure.
The cam member 55 and the jaw 56 must be separated using the screw rod 54 to such an extent that the cam member 55 and the jaw 56 can pass on both sides of the overhanging portions 62 on both sides. Therefore,
The distance between the cam member 55 and the jaw 56 must be adjusted by operating the screw rod 54 at least twice each time each U-shaped groove W2 is hung. Therefore, it can be seen that the device of FIG. 1 is inconvenient for suspending the U-shaped groove W2 of FIG. 2b.

Figures 3 and 4 illustrate the clamp 10 of the present invention. The clamp 10 is similar to the clamp 50 in FIG. 1 in that it has an L-shaped body 1 and a dogleg-shaped movable leg 2 that is rotatably attached to the horizontal beam portion 1A of the body 1 with a pin 4. be.

The body 1 includes a fixed leg 1B hanging from the right end of the horizontal beam portion 1A, and a cam member 5 is rotatably attached to the left side of the lower end of the fixed leg 1B. Movable legs 2
is provided with a jaw 6 at a position facing the cam member 5.

As shown in FIG. 4, a nearly triangular adjustment plate 3 is inserted between the outside of the horizontal beam portion 1A of the body 1 and the inside of the movable leg 2, and the adjustment plate 3 has one vertex aligned with the movable leg 2. It is rotatably attached to the body 1 by a pin 4. The adjustment plate 3 can change its relative position with respect to the body 1 and the movable legs 2, respectively.
In FIG. 3, the adjustment plate 3 is at a predetermined position H with respect to the fuselage 1.
(home position). A locking pin 7 that holds the adjustment plate 3 in the home position H
The locking mechanism 7 equipped with P is attached to the horizontal beam portion 1A of the fuselage 1.
established in As shown in FIGS. 5a and 5b, the locking mechanism 7 includes a locking fitting 32 that is attached to the horizontal beam portion 1A at a position opposite to the rotation pin 4 and has an arcuate surface on the lower surface, and a locking fitting 32 that is attached to the adjustment plate 3 and is attached to the horizontal beam portion 1A. The washer 22 is slidably engaged with the arcuate surface of the lower surface of the metal fitting 32. The locking metal fitting 32 includes a locking pin 7P inserted into the locking metal fitting 32 so as to be able to rise and fall freely, and the washer 22 includes an opening 22H into which the locking pin 7P is inserted. A handle 23 is attached to the upper end of the locking pin 7P,
The handle 23 has an upper end that projects higher than the upper end of the beam-like portion 1A of the body 1. A compression spring 12 is provided between the lower end of the handle 23 and the rotation pin 4.
is attached and constantly presses the locking pin 7P downward. The locking pin 7P connects the lower end to the opening 22H of the washer 22.
When inserted into the home position H, the adjustment plate 3 is locked to the home position H. In FIG. 5b, the locking pin 7P is pulled up from the opening 22H of the washer 22, and the washer 22 is moved along the locking fitting 32 and around the pin 4 in a clockwise direction B.
The aircraft rotated and left its home position H. In this position, the adjusting plate 3 rotates in the clockwise direction B relative to the body 1, separating the lower end of the movable leg 2 from the lower end of the fixed leg 1B.

Returning to FIG. 3, the portion of the screw rod 8 adjacent to the upper end is rotatably supported by the support fitting 9 on the adjustment plate 3,
A portion adjacent to the lower end is screwed into a female thread member 11 attached to the movable leg 2. Reference numeral 26 indicates a pin for rotatably attaching the support fitting 9 to the adjustment plate 3.
A handle 24 is rotatably attached to the upper end of the screw rod 8 by a pin 25, and is rotated between a use position shown by a solid line and a storage position shown by a dotted chain line. 33
shows a locking spring that holds handle 24 in the used position.

The cam member 5 is rotatably attached to the lower end of the fixed leg portion 1B of the body 1 by a pin 17, and its right end is connected to the lower end of the strap 16 by a pin 18. A link 14 is rotatably attached at its right end to a corner portion of the L-shaped body 1 by a pin 27, and its left end is connected to the lower end of the shank 13 by a pin 29. The upper end of the strap 16 is connected to the central portion of the length of the link 14 by a pin 34. Therefore, when the shackle 13 is lifted by a hook (not shown) of a crane, the cam member 5 of the strap 16 is lifted by the pin 17 via the link 14.
The left end pressing surface of the cam member 5 is pressed against the U-shaped groove W2 by rotating the cam member 5 in the counterclockwise direction A. A locking lever 19 adjacent to a corner of the L-shaped body 1 is rotatably attached at one end by a pin 21.

A coil spring 20 is attached to a stud 28a provided at the middle of the length of the locking lever 19 and a shoulder stud 28b provided at a portion adjacent to the lower end of the strap 16, respectively. is locked. In the position of FIG. 3, spring 20 rotates cam member 5 in counterclockwise direction A through strap 16 to lock it in the use position. When the locking lever 19 is rotated in the clockwise direction B from the position shown in FIG.
is lowered, and the cam member 5 is rotated clockwise B around the pin 17 to place it in the unlocked position.

The jaw 6 is attached to the lower end of the movable leg 2 by a pin 30 and is wound around the pin 30 so that a spring 64 holds the face plate 6F in the position shown.

6a and 6b show how the device of the present invention is used. First, the cam member 5 is placed in a non-use position, and the locking pin 7P on the horizontal beam 1A is inserted into the opening 22H of the washer 22 on the adjustment plate 3. Pull it out and rotate the adjustment plate 3 in the clockwise direction B around the rotation pin 4, and if necessary, actuate the screw rod 8 to rotate the movable leg 2 in the clockwise direction B relative to the adjustment plate 3 to move the jaw 6 into the cam. It is sufficiently spaced from the member 5 (Figure 6a). Therefore, clamp 1
The horizontal beam portion 1A is placed on the upper end of the U-shaped groove W2 by arranging the cam member 5 and the jaw of 0 on the right and left sides of the U-shaped groove W2, respectively (FIG. 6b). Next, return the adjustment plate 3 to the home position H and lock pin 7P.
is inserted into the opening 22H of the washer 22 and locked. Furthermore, actuate the screw rod 8 to move the jaw 6 to the lower side of the overhanging portion 62.
It is brought into pressure contact with the side wall of the U-shaped groove W2 and placed in a position where it cooperates with the cam member 5 to clamp the U-shaped groove W2. Then, by bringing the cam member 5 to the operating position and locking it in this position, the shackle 13 can be hung on the hook of the crane and lifted. Complete the lifting work and clamp 1
0 from the U-shaped groove W2, unlock the locking mechanism 7 and move the adjustment plate 3 around the pin 4 in the clockwise direction B.
When the jaw 6 is rotated, the jaw 6 is separated from the U-shaped groove W2 and returned to the position shown in FIG. 6a. In this state, the U-shaped groove W
The clamp 10 removed from 2 can be attached to another U-shaped groove in this position. During this time, it is only necessary to rotate the adjusting plate 3 between the home position H and the position shown in FIG. 6a, and the screw rod 8 does not need to be used except for the lifting operation shown in FIG. 1.

Figure 7 shows the adjustment plate 3 in the home position H from beginning to end.
This shows the case where the clamp 10 is used in a state where it is locked to the cam member 5 using only the threaded rod 8.
Since the U-shaped groove is clamped by the process of bringing the and jaws 6 closer to each other or separating them from each other, the conventional device 5 of FIG.
The clamp 10 will be used in the same manner as 0.

8a and 8b show a modified embodiment 107 of the locking mechanism 7 shown in FIG. Locking pins 101x and 101y are provided which are arranged parallel to each other and whose ends are inserted into openings 102 and 102, respectively, which are bored through adjustment plates 3 and 3 provided on both sides of the horizontal beam portion 1A.

The two left and right plates 1x and 1y constituting the horizontal beam portion 1A of the fuselage 1 have openings 103x and 103y at symmetrical positions with respect to their vertical center plane YY, and a horizontal tubular guide member connects both openings. 104, and the guide member 104 has a vertical center surface.
A pair of locking pins 101x and 101y arranged symmetrically on both sides of YY are slidably fitted. The pair of locking pins 101x and 101y have recesses 106x and 106 at mutually opposing ends, respectively.
A coil spring 105, which is provided with a coil spring 105 and located between both locking pins, has both ends inserted into the recesses 106x and 106y, respectively. Each pin and its driving mechanism are arranged symmetrically on both sides of the vertical center plane YY, so the locking pin 101 on the left end
x will be explained. A support fitting 1 is fixed to the inside of the horizontal beam plate 1x at the upper part of the guide member 104.
08, bell crank 110, corner part with pin 1
It is rotatably mounted with 09. The bell crank 109 has a roller 114 at the end of the upper arm.

Roller 114 rolls along the left surface of handle 100. A cam surface 100B that presses the roller 110 to the left is provided at the lower end of the handle 100. The lower arm of the bell crank 110 is provided with an elongated hole 113, and is deeply inserted into a groove (not shown) bored in the vertical diameter of the pin 101x.
The pin 111 inserted into the long hole 113 is the locking pin 1
It is slidably inserted into another long hole 112 bored in the axial direction of 01x. Therefore, the handle 100
When pulling up above the body 1, the cam part 100B
The bell crank 110 is rotated in the counterclockwise direction B around the pin 109, the locking pin 101x is moved to the right, and the locking pin 101x is pulled out from the opening 102 of the adjustment plate 3 to perform an unlocking action.

When the handle 100 is lowered and the cam portion 100B is separated from the roller 114, the spring 10
5 moves the pin 101x to the left and inserts it into the opening 102 of the adjustment plate 3 to perform a locking action.

As described above, when using the device of the present invention and attaching the clamp 10 to the U-shaped groove W2 for the first time, the locking mechanism 7 is unlocked in advance and the lower end of the movable leg 2 is attached to the fixed leg 1B together with the adjustment plate 3. By rotating the cam member 5 in a direction away from the lower end, the distance between the cam member 5 and the jaw 6 can be easily set to a desired value. Therefore, after placing the clamp 10 on the upper end of the U-shaped groove W2 and returning the adjustment plate 3 to the home position,
is activated to rotate the movable leg 2 and move the jaw 6 into the U-shaped groove W.
1, the angular position of the movable leg 2 relative to the adjustment plate 3 is set, so there is no need to change the angular position when lifting a U-shaped groove W1 of the same size from now on. The use of screw rods becomes unnecessary. By unlocking the adjustment plate 3 and rotating it slightly clockwise, the cam member 5 and jaw 6 can be passed through the widest part of the U-shaped groove W1, and the adjustment plate 3 can be placed in the locked position. All you have to do is place the jaw 6 and cam member 5 in the use position.
The groove W2 can be lifted up. Therefore, handling of the U-shaped groove W2 provided with the overhanging portion 62 can be streamlined.

[Brief explanation of drawings]

Fig. 1 is a front view showing a conventional U-shaped groove lifting clamp, Fig. 2a is a perspective view of the U-shaped groove lifted by the device of Fig. 1, and Fig. 2b is a U-shaped hoisted by the device of the present invention. 3 is a front view of the device of the present invention; FIG. 4 is an end view of the device of FIG. 3; FIG. 5a is an enlarged detailed view of the main parts of the device of FIG. Figure 5b is an enlarged detailed view showing the operation of the main parts of Figure 5a, Figure 6a is a front view of the device in Figure 3 in its ready-to-use position, and Figure 6b is a front view of the device in Figure 3 in its use position. 7 is a front view showing another state of use of the device shown in FIG. 3, FIG. 8a is a front view showing a modified embodiment of the main part of the device shown in FIG. 3, and FIG. 8b is a front view of the device shown in FIG. 8a. FIG. 7 is a sectional view of a modified embodiment. 1... Body, 2... Movable legs, 3... Adjustment plate, 4
...Rotating pin, 5...Cam member, 6...Jaw, 7...
... Locking mechanism, 8 ... Screw rod, 9 ... Supporting metal fittings, 10
...Device of the present invention, 11...Female thread member, 12...
... Spring, 13 ... Shackle, 14 ... Link, 15 ... Locking mechanism, 16 ... Ntrap,
17... Rotating pin, 18... Rotating pin, 19...
Locking lever, 20... Spring, 21... Rotating pin, 22... Washer, 23... Locking handle, 2
4... Screw handle, 25... Rotating pin, 26
... Rotating pin, 27... Rotating pin, 28a, 28
b...Stud, 29...Rotating pin, 30...Pin, 31...Spring, 32...Lock fitting, 3
3... Spring, 34... Pin, 50... Conventional clamp, 51... Body, 52... Movable leg, 5
3... Rotating pin, 54... Screw rod, 55... Cam member, 56... Jaw, 57... Shackle, 58...
Locking mechanism, 59... Handle, 60... Support metal fitting, 61... Thick wall portion, 62... Overhanging portion, 63
...Pin, 64...Pin, 100...Handle,
101x, 101y... Locking pin, 102... Opening (of the adjustment plate), 103... Opening (of the horizontal beam material),
104... Guide member, 105... Coil spring, 106x, 106y... Recess, 107...
... Locking mechanism, 108 ... Supporting metal fittings, 109 ... Pin, 110 ... Bell crank, 111 ... Pin,
112...Long hole, 113...Long hole.

Claims (1)

[Scope of Claims] 1. An L-shaped body consisting of a horizontal beam portion and a fixed leg that hangs down from one end of the horizontal beam portion and has a cam member rotatably attached to the lower end thereof, and the horizontal beam portion The upper end portion of the fixed leg is rotatably attached via a pivot pin at approximately the middle portion of the length thereof, and the lower end portion opposite to the lower end portion of the fixed leg is opposed to the cam member so as to cooperate with the cam member. The cam member is rotatably attached to the fixed leg, and the cam member is rotatably attached to the fixed leg. the strap is rotatably attached at its lower end, and the upper end of the strap is rotatably attached approximately at the center of its length to a link whose one end is rotatably attached to the fixed leg; The link is configured to connect the horizontal beam portion and the movable leg in a clamp rotatably attached at its lower end to a shaft that is vertically movably disposed on the horizontal beam portion at its other end. In between, an adjustment plate having a substantially triangular shape is rotatably disposed at one corner thereof via a rotation pin rotatably connecting the horizontal beam portion and the movable leg. The rotational movement of the adjustment plate via the rotation pin can be prevented via a locking mechanism disposed between the adjustment plate and the horizontal beam portion, and the adjustment plate can be prevented from rotating through the rotation pin. A screw rod is rotatably supported at the other corner portion of the screw rod via a rotatably attached support fitting, and further, the screw rod is rotatably attached to the movable leg. A clamp characterized in that it is configured to be screwed into a female threaded member. 2. The locking mechanism includes a locking metal fitting that is attached to the horizontal beam portion at a position opposite to the rotation pin and has an arcuate surface centered on the rotation pin on the lower surface, and a locking metal fitting that is attached to the adjustment plate. and a washer that slidably engages with the arcuate surface, a locking pin that is inserted into the locking fitting so as to be movable up and down, and an opening formed in the washer so that the locking pin is inserted. 2. The clamp of claim 1 comprising a handle attached to an upper end of said locking pin and a compression spring disposed between a lower end of said handle and said pivot pin.