JPS6019100Y2 - Beam clamp - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a beam clamp suitable for lifting and transporting a shaped steel member having a gripping member having a T-shaped cross section, an H-shaped cross section, or the like.

Conventionally, this type of clamp has a hook-shaped fixed hook on one side of the clamp body, a rotatable swivel hook on the other side, and a T-shaped member inserted between both hooks for support and suspension. something is proposed.

However, although this type of device poses few structural problems for vertical lifting work, it is unsuitable for measuring angles where there is an unbalanced load on either of the hooks. Increasing the structural strength will lead to an increase in the size of the force clamp, and c) since the horizontal part of the T-shaped member is supported by both hooks facing each other, tightening will be unstable, and When such force is applied, slipping and twisting occur, and the clamps tend to come off during lifting.

In addition, focusing on the issue of unstable tightening, a clamp equipped with a tightening member on either of both hooks has been proposed, but it is still unsatisfactory in points a) to c) above. ,
The disadvantage is that the structure is complicated, and the manufacturing and handling operations are complicated and extremely time-consuming.

This idea was developed in view of the above points; it is easy to handle, can be lifted up and down in the vertical direction, and can be lifted at a large hanging angle from either the left or right side. The object of the present invention is to provide a beam clamp that is free from the risk of the clamp coming off during lifting.

One embodiment of this invention will be described below with reference to the drawings.
In FIGS. 1 to 3, reference numeral 1 denotes a main body of a beam clamp, in which two semicircular substrates 1a and 1b are opposed to each other and connected by a pair of left and right bolts 11 and nuts 12.

Reference numeral 2 denotes a fixing hook provided perpendicularly to the outside of the substrate 1a of the main body 1, which has a hook-like shape, and a horizontal groove 2a for supporting the T-shaped member A is formed at the bottom thereof.

Reference numeral 3 denotes a swing hook provided opposite to the fixed hook 2, which has a middle crack 3a inside, and whose upper end is connected to the substrate 1b of the main body 1.
It is pivotally supported by a bolt 32, a nut 33, and a bush 34 on a hook holder 31 protruding from the hook holder 31, and a horizontal groove 3b for supporting member A is formed in the lower part of the hook holder 31, similar to the fixed hook 2. .

Further, a stop pin 35 is stretched over the shoulder of the swing hook 3 and comes into contact with the upper edge of the hook holder 31 to restrict rotation of the swing hook 3.

4 is a compression coil spring for positioning the swing hook 3, and is wound around a spring holding pin 42 which is inserted into the spring holder 41 so as to be vertically movable.

The lower end of the spring holder 41 is pivotally supported at the center of the swing hook 3 by a bolt 43, a nut 44, and a collar 45, and the upper end of the spring holding pin 42 is provided to protrude from the upper part of the lower edge inclined portion 31a of the hook holder 31. It is pivotally attached to the ear-shaped portion 36 by a pin 37.

Due to the elastic force of the compression coil spring 4, in FIG. 2, a force is applied in the direction of arrow B when the swing hook 3 is closed, and in the direction of arrow C when it is open, and the swing hook 3 is maintained in a stable state.

5.5 is a pair of left and right cams provided inside the main body 1;
It has a square shape extending in the direction of the end surface of the main body 1, and the middle part thereof is a torsion coil spring 51 between the substrates 1a and 1b.
The camshaft 52 is pivotally mounted on a camshaft 52, which has a tooth-like engagement portion 5a for the end surface A2 of the vertical portion A1 of the member A at the lower tip thereof, and a tenon portion 5b or tenon portions that intersect and overlap each other at the base end. A stepped portion is formed, and a laterally elongated hole 5c is further bored facing the groove portion 5b.

Note that the torsion coil spring 51 is connected to either one of the cams 5
You can attach one to the other and omit the other.

Reference numeral 6 denotes a hanging ring in the shape of an inverted cup inserted into the inside of the main body 1, and an insertion hole 6 for a wire to be stretched by a crane or the like is provided in the upper part.
a, the lower part is pivotally connected to the upper end of a daruma-shaped link 61 by a pin 62, and the lower end of the link 51 is located between the tenons 5b of the cams 5, 5, and the long hole 5c
, 5c.

Therefore, the cams 5, 5 whose intermediate portions are pivotally supported are opened and closed by the vertical movement of the pin 63, the link 61 connected thereto, and the hanging ring 6, which pivotally connect the base end elongated holes 5c, 5c.

(Fig. 3, arrow E) Furthermore, since a torsion coil spring 51 is wound around the cam shaft 52 of the cam 5, by slightly pulling up the suspension ring 6, the initial load due to the repulsive force of the torsion coil spring can be reduced to the cam. 5,5 can be applied to the member.

Next, the operation will be explained based on the above configuration.

When vertically lifting or horizontally moving a shaped steel member 7 having a T- or H-shaped gripping member A on the end face, member A is first
into this clamp.

That is, when the swing hook 3 is first rotated upward, it opens with a single touch due to the elastic force of the compression coil spring 4, and the stopper pin 35 hits the upper edge of the hook holder 31, and is held in a stable opened state. Ru.

Next, when the hanging ring 6 is lowered into the inside of the main body 1, the cams 5, 5, which are pivotally connected to the pin 63, are moved by the torsion coil spring 51.
It rotates easily in the direction of arrow E around the camshaft 52 and opens like a wing.

One side of the member A is fitted into the horizontal groove 2a of the fixed hook 2, and the other side is fitted into the horizontal groove 3b by rotating the swivel hook 3. In this case as well, the compression coil spring 4 closes with one touch. This will ensure support for member A.

In this state, the work of holding the T-shaped member A is completed, and the steel-shaped member 7
can be lifted.

Next, when the hanging ring 6 is pulled vertically or obliquely upward by a wire, the pins 62 and links 61 move within the boards 1a and 1b, and as mentioned above, the cam 5.5 rotates and closes in the direction of the arrow. The tooth-like engaging portion 5a abuts on the end surface A2 of the member A, and the member A is pressed against the cams 5, 5.

In the lifted state, even if a new force is applied to the shaped steel member 7 from either the left, right, front or back direction, the opposing cam 5
, 5, the clamp will not come off.

That is, the member A is suspended horizontally by the fixed hook 2 and movable hook 3, and its vertical end face is held by the cams 5, 5, so that it is restrained from all sides.

The above description has been made of the case where the length between both end surfaces A2 of the T-shaped gripping member A attached to the shaped steel member 7 is short and the gripping member A is held by the cams 5, 5 (see FIG. 3).

However, according to the present invention, it can be effectively used even when the gripping member A is a long object such as a rail.

That is, with the cams 5, 5 open, the gripping member A is fitted into the horizontal grooves 2a, 3a of the fixed hook 2 and the rotating hook 3 in the same manner as described above (see FIG. 2), but the hanging ring 6
When the grip member A is pulled up, the cams 5, 5 are rotated and closed due to the above-mentioned action, and the tooth-like engaging portions 5a, 5a press against the upper surface of the grip member A.

As a result, the gripping member A has the cams 5, 5, the fixed hook 2,
It is pressed and clamped from above and below by the rotating hook 3.

Therefore, even if an external force is applied from the longitudinal direction of the grip member A in the lifted state, the cams 5, 5 press and fix the grip member A more strongly from above and below, as described above, so that the clamp will not come off.

As explained above, in this invention, a fixed hook and a rotating hook pivotally connected to a hook holder are respectively provided in the direction orthogonal to the outside of two opposing boards, and a compression coil spring is installed between the rotating hook and the hook holder. It is constructed such that both hooks suspend and support the horizontal lower surface of the T-shaped, H-shaped, etc. gripping members of the steel section members, and the rotation hook can be opened and closed with a single touch using a compression coil spring. A suspension ring is inserted into the inside of the board, and the pin at the lower end is pivotally supported in the elongated hole at the base end of a pair of cams extending in the direction of both end surfaces of the board, and the intermediate portions of the cams are respectively pivoted to the board. A torsion coil spring is wound around at least one of the supporting camshafts, and a tooth-like engagement part is formed at the opposite end of the cam to form a suspension ring that cooperates with the torsion coil spring wound around the camshaft. By the pulling operation, if the gripping member is a short object, the end face of the vertical part is pressed and clamped by the opposing cam, and if the gripping member is a long object, the upper surface is pressed by the cam and the above-mentioned fixing hook and rotation are pressed. Since the movable hook presses the clamp from above and below, it is extremely easy to operate, and the clamp can be held horizontally and stably not only when lifting shaped steel members vertically, but also when pulling from the side or measuring angles. Even if an unbalanced load is applied to the clamp during operation,
There is no danger of the clamp coming off, allowing for safe and reliable operation.

[Brief explanation of the drawing]

The drawings show one embodiment of this invented clamp. Fig. 1 is a front view, Fig. 2 is a side view, and Fig. 3 is a cross section of Fig. 2.
FIG. 2 is an explanatory diagram of the state of use, taken in cross section along a line. 1...Clamp body, 2...Fixed hook, 3...Swivel hook, 4...Compression coil spring, 5...Cam, 6 ...hanging ring.

Claims (1)

[Scope of utility model registration request] A fixed hook and a rotating hook pivotally connected to a hook holder are provided on both sides of the two opposing boards in an orthogonal direction, respectively,
A coil spring for positioning is provided between the swing hook and the hook holder, a hanging ring is inserted into the inside of the two boards, and the pin at the lower end is pivoted by a camshaft with an intermediate portion relative to the board. The pin is pivotably supported in a long hole at the base end of a pair of cams extending in the direction of both end surfaces in the substrate, and the pin is movably provided between the substrates, and a torsion coil spring is wound around at least one of the cam shafts. and a tooth-like engagement portion is formed on the opposing tip of the cam.