JPH0143845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp used for lifting a lining board, and more specifically, for removing a wire suspended from a crane from a lining board that is temporarily laid on a road surface during civil engineering work such as an underground railway. Related to clamps that can be freely connected.

The lining plate is a flat box-shaped structure having a relatively small depth and having a top plate made of rectangular steel material,
A hook tied to both ends of a short wire called a sling is fitted into each of a pair of openings located at both ends of one diagonal line of the top plate, and the sling is secured. The central part will be lifted and transported by a crane. In order to removably fit a hook of a predetermined size and to operate the hook safely and reliably, the opening formed in the top plate of the lining plate is defined to have an accurate size. However, in actual workplaces, the openings made in the lining plates are often rough, making it difficult for the hooks to engage, causing reliability problems and creating danger. The present invention aims to solve this type of problem that arises in the handling of lining plates.

An object of the present invention is to provide a clamp having a size sufficient to securely engage the lower surface of the top plate at the outer peripheral portion of the opening after being inserted into the opening, even when the opening for receiving the clamp bored in the top plate of the lining plate is large. Not only does it have
To provide a reliable clamp equipped with a claw member that quickly and easily moves back and forth between a retreat position where it easily passes through an opening and a use position where it locks onto the lower surface of a top plate around the opening.

According to the present invention, a vertical cylindrical cavity is defined by a pair of vertical walls arranged symmetrically with respect to a vertical plane passing through the center line, and has a cavity having an open upper end and a bottom wall at the lower end. a body inserted into the cavity, one end rotatably attached to the body at the top of the bottom wall, a storage position in which the free end is placed within the cavity, and a storage position in which the free end protrudes outside the body and a portion adjacent to the one end is attached to the bottom. A claw member that rotates between a use position where it is seated on a support surface on a wall, an eye portion that is adjacent to the upper end of the body and extends to the outside of the body, and a portion that is fitted into the cavity and rotates between a portion that is adjacent to the upper end of the body. An eye fitting consisting of legs that are freely connected to each other, a sleeve whose upper end is rotatably attached to the leg of the eye fitting and whose lower end is open, and one end of which is rotatably positioned adjacent to the free end of the claw member. It consists of a plunger which is connected and whose free end is slidably fitted into the sleeve, and a spring which is inserted inside the sleeve between the upper end of the sleeve and the free end of the plunger and biases the plunger in a direction to push the plunger out of the sleeve. A connecting link is provided, and the eye fitting is provided with a shoulder portion on the leg portion that is pressed against the upper end of the sleeve of the connecting link and pushes the connecting link into the storing position when the claw member approaches the storing position. A clamp used for lifting the lining board can be obtained.

Now, an embodiment of the apparatus of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the handling of the lining plate W. The top plate 53 of the lining plate W has a pair of openings 52a, 52 bored at positions adjacent to both ends of one diagonal line.
It is equipped with b. Short wire such as sling 5
1 has conventional hooks or clamps 54 tied to both ends, and each clamp 54 is inserted into the opening 52a, 52b, respectively, and its respective claw member is locked to the lower surface of the top plate around the opening.
A crane hook is hung on the central part of the length of the short wire 51. In the previous example, opening 5
Since the dimensions of 2a and 52b are larger than specified, and because there is a wave inside and the claw of the clamp hits the web, the locking of the hook or clamp becomes uncertain.

Referring to FIG. 2, the clamp 10 of the present invention is shown inserted into an opening 52a formed in the top plate 53 of the lining plate W, with the claw 2 protruding to the use position. The claw 2 placed in the use position has its upper end opened 52a.
It is made to face the lower surface of the top plate 53 around the periphery of.

As shown in FIG. 3, the device 10 of the present invention includes a pair of vertical walls 23A, which are arranged symmetrically with respect to a vertical plane (a plane perpendicular to the plane of the paper) passing through the center line YY.
The body 1 has an elongated vertical cylindrical shape and has a vertical cavity 9 defined by 23B and having an open upper end and a bottom wall 20 at the lower end. In the illustrated example, the cavity passes through the entire cylindrical body 1 in the diametrical direction, but only one diametrical end may be open to the cylindrical surface. The opening in the cylindrical surface of the cavity 9 serves as an entrance or window for the claw member described below. In actual manufacture, the body 1 is constructed by vertically dividing a cylindrical body into two mutually symmetrical halves 1A and 1B, which are fastened together using upper and lower joining bolts 11 and 12. Note that the upper joint bolt 11 also serves as a rotation pin for the eye fitting 3 described below, and the lower joint bolt 12
also serves as a rotation pin of the claw member 2, which will be explained below.
The body 1 is provided with a horizontal flange 21 extending around the outer periphery of the body 1 at a position adjacent to the upper end, and when the body 1 is inserted into the opening 52a of the lining plate top plate 53, the lining plate W
It is designed to prevent it from falling into the interior.

Returning to FIG. 2, the device 10 of the present invention includes a claw member 2 which is inserted into the cavity 9 and whose lower end is rotatably attached to the body 1 via the bolt 12 at the upper part of the bottom wall 20.
and the connecting bolt 11 is fitted into the upper end of the cavity 9.
An eye fitting 3 having a leg portion 14 rotatably attached to a portion adjacent to the upper part of the body 1, and a telescopic eye fitting 3 connecting a portion adjacent to the upper end of the claw member 2 and the leg portion 14 of the eye fitting 3. Link 4 is provided.

The eye fitting 3 has an annular eye portion 13 that extends outside the fuselage 1 adjacent to the upper end of the fuselage 1 and connects the end of a short wire 51 such as a sling hung on the hook of the crane, and a connecting bolt 11. The leg portion 14 extends in the opposite direction to the eye portion 13 and has its tip connected to the link 4 via an upper pin 15. The leg has a shoulder 8 which forms a step on the right half way between the connecting bolt 11 and the upper pin 15. The shoulder 8 serves to force the link 4 into the retracted position as the pawl member 2 approaches the retracted position, as will be explained below. In the use position shown in FIG. 2, the annular eye portion 13 of the eye fitting 3 is placed directly above the joining bolt 11.

The claw member 2 is attached to the eyepiece 1 on the left side adjacent to the upper end.
7 and is connected to the lower end of the link 4 via a lower pin 16 inserted into the eyepiece 17. fuselage 1
A bottom wall 20 provided at the lower end not only closes the lower end of the cavity 9 but also closes the claw member 2 when placed in the position of use.
It is provided with a pedestal 22 that supports the weight of the lining plate W during lifting.

The telescopic link 4 connecting the eye fitting 3 and the claw member 2 is a tubular sleeve 5 whose upper end is rotatably attached to the tip of the leg 14 of the eye fitting 3 via an upper pin 15 and whose lower end is open. , the lower end is rotatably connected via a lower pin 16 to an eyepiece 17 provided at a position adjacent to the free end of the claw member 2 (the end opposite to the end to which the connecting bolt 12 is attached). A plunger 6 whose upper end is slidably fitted into the sleeve 5, and a plunger 6 which is inserted between the upper end of the sleeve 5 and the upper end of the plunger 6 inside the sleeve 5 and biases the plunger 6 in a direction to push the plunger 6 out of the sleeve. It consists of a spring.
The plunger 6 has an elongated hole 19 bored parallel to its central axis, and a sliding pin 18 that is slidably fitted into the elongated hole is attached to the sleeve 5 to prevent the plunger 6 from falling out of the sleeve 5. has been completed.

FIG. 4 shows the state in which the claw member 2 is stored in the internal cavity 9 of the body 1, and the eye fitting 3 is moved clockwise Q around the joint bolt 11 from the usage position shown in FIG.
The upper pin 15 is placed on the left side of the connecting bolt 11. Correspondingly, link 4 is the center line of fuselage 1.
The claw member 2 is pulled in to the left side of YY, and the claw member 2 stands almost vertically from the connecting bolt 12 and completely covers the right wall surface of the body 1.
It is placed inside. As shown in the figure, when the claw member 2 is placed in the retracted position, the link 4, especially the lower pin 16, is placed on the left side of the straight line ZZ connecting the upper pin 15 and the connecting bolt 12, the so-called dead center. The claw member 2 is locked in a stable position.
The reason for this is that in order to pull out the claw member 2 to the right from the position shown in Figure 4, the link 4 must be rotated counterclockwise P around the upper pin 15 by overcoming the tension stress of the spring 7 of the link 4. This is because it will not happen. Further, when the claw member 2 reaches a position adjacent to the storage position, for example, position F, the link 4 must overcome the tension of the spring 7 and move over the dead center ZZ. The aforementioned shoulder portion 8 is provided on the eye fitting 3, and when the link 4 reaches position F when the claw member 2 is retracted, the shoulder portion 8 presses the upper end of the sleeve 4 laterally to the left and crosses the dead center ZZ. and push it into the storage position.

In use, as shown in FIG. 4, the device 10 of the present invention tilts the eye fitting 3 to a nearly horizontal position D and stores the claw member 2 in the cavity 9.
It is inserted into an opening 52a made in the top plate 53 of.
After the flange 21 is brought into contact with the top plate 53, the claw member 2 is projected from the cavity 9 to the use position outside the body 1. FIG. 5 shows the repeated process of the claw member 2. First, the eye fitting 3 placed at the solid line position D is moved counterclockwise P around the joint bolt 1.
When the link 4 is rotated to reach the dotted line position C, the link 4 passes the dead center and is placed at the position C', but the claw member 2 is slightly rotated around the connecting bolt 12 and placed at the position C. Furthermore, when the eye fitting 3 is rotated in the counterclockwise direction P around the joint bolt 11 and reaches the B position shown by the dashed line, the link 4 is placed at the position B', but the link 4 is slightly rotated around the lower pin 16. The claw member 2 only tilts and hardly rotates around the connecting bolt 12. When the eye fitting 3 is subsequently rotated in the counterclockwise direction P and placed at the position A shown in two-dot chain line, the link 4 is placed at the position A' and the claw member 2 is pulled out to the position a. Therefore, when the eye fitting 3 is reversed and rotated around the connecting bolt 11 in the clockwise direction Q to return to the position B indicated by the dashed dot line, the link 4 is placed at the position B' and the claw member 2 is pushed out to the use position b. To return the claw member 2 placed in the use position to the storage position, rotate the eye fitting 3 located at the dashed-dotted line position B around the joining pin 11 in the clockwise direction Q, pass through the dotted line position C, and move to the solid line position D.
When folding down, link 4 is placed from position B' to position D via position C'. During this time, link 4 crosses the dead center. Due to this movement of the link 4, the claw member 2 is retracted from position b to position d via a and c.

Note that positions C and D correspond to the limit positions of the inclination angle of the sling wire when lifting the lining plate W.

As shown above, the device of the present invention has a small number of required parts and a simple structure, so it can be manufactured at an extremely low cost, and when not in use, it can be compactly assembled into just the body and the eye fitting, making it convenient to carry. It is. Another feature of the present invention is that the claw member is securely locked in the stored position and does not interfere with the movement in and out of the opening 52 of the body 1, and that the claw can be moved in and out simply by rotating the eye fitting, allowing quick and easy operation. This is an advantage.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the handling of the lining board;
2 is a sectional view showing the device of the present invention in use, FIG. 3 is an end view of the device of FIG. 2, FIG. 4 is a sectional view of the device of FIG. 2 showing the retracted claw, and FIG. The figure is the second
FIG. 4 is an explanatory view showing the extension and retraction of the claws of the device shown in the figure. 1...Body, 2...Claw, 3...Eye fitting, 4...
... Telescopic link, 5 ... Sleeve, 6 ... Plunger, 7 ... Spring, 8 ... Shoulder, 9 ... Hollow, 1
0... Device of the present invention, 11... Joining bolt (upper), 12... Joining bolt (lower), 13... Circular ring, 14... Leg, 15... Upper pin, 16...
Lower pin, 17...Eyepiece, 18...Sliding pin, 19...Elongated hole, 20...Bottom wall, 21...Flange, 22...Pedestal.

Claims (1)

[Claims] 1. A vertical cylindrical body having a vertical cavity defined by a pair of vertical walls arranged symmetrically with respect to a vertical plane passing through the center line, with an open upper end and a bottom wall at the lower end; It is inserted into the cavity, and one end is rotatably attached to the body at the top of the bottom wall, and the free end is placed in the cavity at a storage position, and the free end is protruded outside the body, and the part adjacent to the one end is attached to the bottom wall. A claw member that rotates between the use position where it is seated on the support surface of the body, an eye portion that is adjacent to the upper end of the body and extends outside the body, and a portion that is fitted into the cavity and is rotatable between the eye portion that is adjacent to the upper end of the body and adjacent to the upper end of the body An eye fitting consisting of a leg to be connected, a sleeve having an upper end rotatably attached to the leg of the eye fitting and a lower end open, and one end rotatably connected to a position adjacent to the free end of the claw member. a connecting link consisting of a plunger whose free end is slidably fitted into the sleeve; and a spring inserted within the sleeve between the upper end of the sleeve and the free end of the plunger to bias the plunger in a direction to push the plunger out of the sleeve. , wherein the eye fitting has a shoulder portion on the leg portion that is pressed against the upper end of the sleeve of the connecting link and pushes the connecting link into the stored position when the claw member approaches the stored position. Clamp used to lift boards.