JPH0221507Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Technical Field The present invention relates to a clamp, and more particularly to a clamp that grips steel materials such as steel plates and shaped steel and is hung on the hook of a crane.

Prior art and its problems Japanese Patent Application Laid-Open No. 54-151256 discloses a movable jaw rotatably attached to the inside of the fuselage adjacent to a deep groove for inserting the steel material cut into the lower end of the fuselage. A clamp is shown with a locking mechanism to hold the clamp in the operative position. In the embodiment described in the above-mentioned publication, a link is installed to connect the movable jaw and a shackle that has an eye that is hung on the hook of the crane and applies a rotational moment to the movable jaw. The locking mechanism has one end locked to a first stud attached to a portion adjacent to the lower end of the link, and is moved via a rotation shaft to a position opposite to the outer periphery of the movable jaw housed in the retracted position inside the body. The main body of the spring is a snap spring whose opposite end is locked to a second stud which is fixed to a rotatable pawl that is rotatably attached to one end. The snap spring is moved from the non-operating position to the operating position in accordance with the rotational position of the rotating pawl. The end of the snap spring that is locked to the second stud is located on the opposite side of the pivot pin from the end that is locked to the first stud, and the snap spring is placed on one side of the straight line connecting the first stud and the pivot pin. When held from one side to the other side beyond a point on said straight line, i.e. the dead point, it is placed in a stable operating position which applies the desired deflection moment to the movable jaw.

Accordingly, a stopper pin is provided in the body to prevent rotation of the pivoting pawl and maintain the snap spring in a stable operating or locked position. In the locked position, the pivot pawl presses against the stopper pin a shoulder provided at the end opposite to the end on which the pivot pin is attached. an extension projecting from the outer surface of the body of the pivot pin; and a control handle for pulling the pivot pawl placed in the locking position away from the stopper pin, placing it in the unlocking position, and returning the pivot pawl from the unlocking position to the locking position; attached to the part.

By the way, when the above-mentioned clamp grips a steel material and lifts it to a high place and then lowers it to a predetermined position, it is first necessary to unlock the locking mechanism. In the case of the clamp described in the above publication, it is possible to guide a control rope tied to the tip of a control handle provided on the outside of the fuselage to a desired point at a low level, but the operation is uncertain and reliability is poor. Missing. The present invention aims to solve this type of problem that occurs with conventional clamps.

Purpose of the invention The purpose of the invention is to mount the main components such as the control handle of the locking mechanism that holds the movable jaw in the operating position as well as the lever that rotates the control handle to the unlocked position inside the body. The object of the present invention is to provide a clamp equipped with a reliable remote unlocking mechanism that can prevent unintended operation and damage.

The above object of the present invention is to provide a body 11 having a steel material insertion groove cut into one end, and a body 11 that is rotatably mounted inside the body adjacent to the insertion groove and that engages a steel plate in the insertion groove. A movable jaw 15 with retractable teeth and a snap spring 21 for biasing the movable jaw to a steel gripping position.
and a locking mechanism 30 having a pivoting arm 20 for moving the snap spring between an activated position and a non-activated position, the clamp having the locking mechanism 30 at the end of the body opposite to the insertion groove. A driving pawl 9 is attached to an end inside the body of a rotating shaft that is installed almost parallel to the insertion groove, and a driving pawl 9 is rotatably installed inside the body adjacent to the driving pawl and has one end engaged with the driving pawl. a bell crank 3 whose opposite end is in a position to support the rotating arm 20; and an unlocking rope 6 whose one end is fixed to the rotating shaft outside the body and which extends perpendicularly to the rotating shaft and has the opposite end. This is achieved by the clamp of the present invention, which is equipped with a remote unlocking mechanism 1 consisting of a drive lever 4 that connects the

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the device of the present invention will be described below with reference to an embodiment shown in the accompanying drawings.

Referring to FIGS. 1 and 2, a fuselage 11 is shown which is constructed by arranging two substantially triangular side plates 12a and 12b in parallel with a predetermined distance apart and firmly assembling them with spacers 13a, 13b and 13c. There is. The fuselage 11 is provided with a deeply cut horizontal steel insertion groove 14 on the right side. A movable jaw 15 is inserted into the body at the upper part adjacent to the insertion groove 14, and the rotation axis 1
It is rotatably supported by 7. Movable jaw 15
has a substantially triangular shape, the pivot shaft 17 is disposed adjacent to one vertex of the movable jaw 15, and has an arcuate toothed portion 24 on one side opposite the pivot shaft 17. The movable jaw 15 rotates between an operating position shown by a solid line and a retracted position shown by a dotted chain line. In the working position, the toothed part 24 of the movable jaw 15 protrudes into the insertion groove 14 and bites into the surface of the steel material inserted into this part. A shackle 16 having an eye ring (eye) 16E at its upper end has its lower end inserted into the interior of the body, and a connecting pin 18
It is connected to another vertex of the movable jaw 15 via.
Therefore, an eye ring 1 is attached to the crane hook (not shown).
When the shaft 16 carrying the 6E is pulled upward, the movable jaw 15 is placed in the operating position shown by the solid line, and when the shaft 16 is lowered into the fuselage, the movable jaw 15 is placed in the retracted position shown by the dotted chain line. .

A locking mechanism 30 is shown on the left side of the movable jaw 15 that permanently holds the movable jaw 15 in the activated position.

A U-shaped rotating arm 20 is inserted into the upper left corner of the body 11, and the tips of both legs are connected to the short axis 19, respectively.
It is rotatably attached to the side plates 12a and 12b by a and 19b. The rotating arm 20 has short shafts 19a, 19
A horizontal first stud 22 is attached at a position spaced apart from b. On the other hand, the movable jaw 15 has a second stud 23 mounted at its apex adjacent to the pivot axis 17. Coiled snap spring 2
1 has its left end secured to a first stud 22 and its right end secured to a second stud 23. 1st stud 22
is the center of the short axes 19a, 19b and the second stud 2
3, the snap spring 21 is placed in a stable operating position and continuously pulls the second stud 23 to the left. That is, the movable jaw 15 is connected to the rotation axis 17.
is biased counterclockwise around A and locked in the operating position shown by the solid line. The rotating arm 20 has a short axis 19a,
At the end opposite 19b, it is provided with a control ring 26 attached via a chain 27.

In the present invention, a bell crank 3 is used as a member for holding the first stud 22 at a predetermined position below the straight line. The bell crank 3 has a rotating pin 5 adjacent to the left end of the fuselage 11 and located approximately at the center of the height.
It is installed through. The bell crank 3 connects the left arm 3L to the end of an arcuate drive claw 9 fixed to the end inside the body of the horizontal rotation shaft 2 fitted in a bearing 25 attached to the center of the left end of the body 11. The right arm 3R is placed in a position to support the rotating shaft 20. A pendulum-shaped drive lever 4 is attached to the left end of the horizontal rotation shaft 2. The drive lever 4 has a rope 6 tied to its lower end that is led from low ground. As shown in FIG. 3, the bell crank 3 is made up of two plates of the same size, and each plate is placed under both legs of the rotating arm 20. As shown in FIG. 1, a spring 7 is provided whose upper end is engaged with a stud 8 at the lower end of the bell crank 3, and whose lower end is engaged with a spacer 13b in the body, and the bell crank 3 is rotated in a clockwise direction B around a rotation pin 5. It generates a moment that causes it to rotate.

When the locking mechanism 30 is to be unlocked from a remote location during use, the rope 6 is pulled and the drive lever 4 is tilted to the right or left as shown in FIG. In such a case, the driving claw 9 rotates together with the rotating shaft 2, and the end 9E of the driving claw 9 pushes down the left arm 3L of the bell crank 3 that is locked thereto, pushes up the right arm 3R, and rotates the rotating arm. The locking mechanism 20 can be easily unlocked by pushing up the locking mechanism 20 and bringing the first stud 22 in a straight line.

Effects of the invention As described above, in the present invention, the rotating arm 20,
Since the bell crank 3, drive pawl 9, and other members constituting the unlocking mechanism are completely housed inside the body 1, they will not be damaged by contact with foreign objects and will not operate against the user's wishes. Nor.

Another advantage of the present invention is that the locking mechanism itself can be greatly simplified by using the rotating arm 20 of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the device of the present invention, Fig. 2 is a side sectional view of the device of Fig. 1, Fig. 3 is a horizontal sectional view of Fig. 2, and Fig. 4 is an end view of the device of Fig. 1. It is a diagram. 1... Remote unlocking mechanism, 2... Rotating shaft, 3... Bell crank, 4... Drive lever, 5... Rotating pin, 6... Rope, 7... Spring, 8... Stud, 9 ... Drive claw, 10 ... Device of the present invention,
11... Body, 12a, 12b... Side plate, 13
a, 13b, 13c...Spacer bolt, 14...
... Insertion groove, 15 ... Movable jaw, 16 ... Shackle, 17 ... Rotating shaft, 18 ... Connection pin, 19
a, 19b... Short axis, 20... Rotating arm, 21...
Snap spring, 22...1st stud, 2
3...Second stud, 24...Toothed portion, 25...
... Bearing, 26 ... Control ring, 27 ... Chain, 30
...Lock mechanism.

Claims (1)

[Scope of utility model registration request] Body 11 with a steel insertion groove cut into one end
a movable jaw 15 that is rotatably mounted inside the body adjacent to the insertion groove and has teeth that bite into the steel plate in the insertion groove; and a snap spring that biases the movable jaw to a steel material gripping position. 21 and a locking mechanism 30 having a pivot arm 20 for moving the snap spring between an activated position and a non-activated position, the clamp having a locking mechanism 30 at the end of the body opposite to the insertion groove. a drive claw 9 attached to an end inside the body of a rotating shaft that is attached substantially parallel to the insertion groove; and a drive claw 9 that is rotatably attached to the body adjacent to the drive claw and has one end connected to the drive claw. a bell crank 3 that is locked and whose opposite end is placed in a position to support the rotating arm 20; and an unlocking rope that has one end fixed to the rotating shaft on the outside of the body and extends perpendicularly to the rotating shaft and has the opposite end. A clamp characterized in that it is equipped with a remote unlocking mechanism (1) consisting of a drive lever (4) to which a drive lever (4) is connected.