JPH0225830Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] To be able to lift and move a heavy object with a crane, and then disconnect the heavy object from the hoisting rope of the crane by remote control at the desired location. This invention relates to a safety device for a shackle that prevents the load bearing shaft from slipping out against one's will.

[Technical background]

Due to its structure, when constructing structures such as high-rise buildings like today, conventional shafts are constructed by connecting columns made of H steel upward, but the lower column is not firmly fixed. After that, a lifting piece is attached to the upper end of the upper column, a shackle is engaged with this lifting piece, and the wire attached to the shackle is firmly fixed to the upper end of the lower column by a crane. , the worker climbs up to the top of the upper column by some method, removes the pin or bolt nut that engages the shackle and the piece, removes the shackle from the upper column, and moves on to the next work. However, this removal work has the disadvantage that the higher the location, the more dangerous and difficult the work.

Therefore, the applicant of the present invention devised a method disclosed in Japanese Utility Model Publication No. 15936/1983, in which a horse-shoe-shaped main body is engaged with a pin and an arm so as to be able to protrude and retract. By pulling, the lower end of the arm moves outward and the pin is removed, but this requires a person to pull with great force, and there are also restrictions on where one can stand. Moreover, with this idea, it is necessary to loosen the rope and use its own weight to tilt the main body in either direction to the left or right, remove the sphere from the triangular recess, and leave the pin free from the pin hole, which imposes restrictions on the posture of the shell main body. There are many inconveniences such as: The invention of the present application improves this point.

[Conventional technology]

A technology that uses pressurized fluid to insert and remove a load bearing shaft and allows the supply and disconnection of this pressurized fluid to be remotely controlled is disclosed in Japanese Patent Application Publication No. 135089/1989.

[The problem that the idea attempts to solve]

Shackles that relay the loading and unloading of heavy objects are constantly prone to undesirable phenomena such as unbalanced loads, rotation, and rocking. There are rare cases where a load bearing shaft is removed against one's will. It is a matter of utmost importance that such situations must be prevented at all costs.

The purpose of the present invention is to mechanically prevent the phenomenon of natural removal of the load bearing shaft, which is strictly observed above.

[Means to solve the problem]

In this invention, as a means to achieve the above object, two vertical members 3 are provided in the lower part of the main body 2, which has a hole 1 horizontally bored in the upper part for attaching a hoisting rope, with two vertical members 3 facing downward at a constant distance in the center. Both vertical members 3
The load receiving shaft 12 is inserted horizontally and coaxially through the insertion hole 4 of the load receiving shaft, and the load receiving shaft 12 is inserted between the vertical member 3 and the hole 1.
A large diameter hole 5 is horizontally drilled in the hole 5, a fluid cylinder 6 is pivotally mounted in the hole 5, and a rod 7 of the fluid cylinder 6 is inserted into the hole 5.
An arm 8 is pivotally connected to the side surface of the main body 2 with a pin 9 at a position midway between the center position of the hole 1 and the top surface of the hole 5 on the side where the rod protrudes and enters. A projecting piece 11 is provided on the inside of the lower end of the arm 8 and has an outwardly curved arcuate groove 10 having a horizontal recess 10a pointing outward at the upper end. The shaft hole 12a of the protruding load receiving shaft 12 is inserted and fitted into the vertical groove 13 provided in the head 12a, and the circular arc groove 10 having the horizontal recess 10a of the protrusion 11 inserted is inserted into the shaft hole provided in the head 12a. By inserting the pin 14 so that the load bearing shaft 12 and the protruding piece 11 can rotate freely, and by providing the valve 15 to connect the fluid hose to the cylinder 6, the valve can be connected. When fluid is pumped through the connected hose and the cylinder is actuated to extend the rod, the arm rotates around the pivot point at the upper end, and the pin pivoted at the bottom of the arm is pulled out to open the section at regular intervals. If the hose is made long and the shackle is separated from the suspended load, there are no restrictions on where the worker can stand, and since the operator only needs to open and close the valve of the high-pressure cylinder, no force is required, making the work easier. The problem was solved by doing this.

[Effect]

Fit the suspension fittings for the suspended load between both vertical members, fit the load receiving shaft 12 into the insertion hole 4 of the opposite vertical member 3, operate the crane, wind up the hoisting rope, and place the suspended load in a predetermined position. Once the load is lowered and the suspended load is securely fixed, operate the switching valve of the high pressure cylinder to which the hose connected to the cylinder 6 is attached to forcefully send fluid to the cylinder 6 and extend the piston rod 7, which is installed in the main body 2. As the lower part of the arm 8 rotates outward using the upper pin 9 as a fulcrum, the pin 14 moves from the horizontal recess 10a at the upper end of the arcuate groove 10 to the upper end of the arcuate groove 10, and when the arm 8 further rotates, the lower part rotates outward. The groove 10 rotates upward using the pin 14 as a guide, and the load bearing shaft 12 begins to be pulled out from the insertion hole 4, and the arm 8
Since it is pulled into the vertical member 3 on the side, the hanging fitting of the suspended load can be removed.

Thereafter, by operating the cylinder 6 and retracting the rod 7, the arm 8 is returned to its original position, and the load receiving shaft 12 is fitted into the insertion hole 4 of the vertical member 3, closing the gap between both vertical members and opening the crane. This prevents objects from fitting between both vertical members 3 during movement.

In particular, in the present invention, when a phenomenon occurs in which the load receiving shaft 12 unexpectedly moves toward the arm 8 side during use, the arm 8 tries to rotate and engages with the pin 14 and the semicircular recess 10a. Occurs when At this time, the bottom side of the horizontal recess 12a acts to push up the pin 14 from below, preventing the pin 14 from moving toward the arm 8, so that the load receiving shaft 12 will not come out from the vertical member 3 during use. Can work safely.

〔Example〕

A hole 1 for attaching a hoisting rope is horizontally bored in the upper part of the main body 2. At the bottom of the main body 2, two vertical members 3 are provided facing downward at a constant interval in the center, and a load bearing is provided horizontally and coaxially on both vertical members 3. The shaft is provided through the insertion hole 4, and the load receiving shaft 12 is inserted across both insertion holes 4, and the main body 2 is inserted between the vertical member 3 and the hole 1.
A large-diameter hole 5 is horizontally bored in the hole 5, and a fluid cylinder 6 is pivotally mounted in the hole 5, and a hole 5 is located midway between the center position of the hole 1 and the top surface of the hole 5 on the side where the rod 7 of the fluid cylinder 6 protrudes and enters. The arm 8 is attached to the side of the main body 2 at the position of
The rod 7 is pivotally connected to the middle of the arm 8 by a pin 16, and the upper end has a horizontal recess 10a oriented outward, and is connected to the inner end of the recess 10a. A head portion 1 of a load receiving shaft 12 is provided with a projecting piece 11 having a curved arcuate groove 10 inside the lower end of the arm 8, and the projecting piece 11 projects from the vertical member 3.
The head 1 is inserted and fitted into the vertical groove 13 provided in the head 1.
The shaft hole provided in the pin 14 is aligned with the circular arc groove 10 having the horizontal recess 10a of the protrusion 11 inserted.
The load receiving shaft 12 and the projecting piece 11 are connected so as to be rotatable, and a valve 15 for connecting a fluid hose to the cylinder 6 is provided.

17 is a crane, 18 is a jib, 19 is a hoisting rope, and 20 is a suspended load, which is used in this application for a structure using a steel frame.

21 is a hose, 22 is a high pressure fluid cylinder, and 23 is a three-way switching valve provided on the cylinder.

[Effect of idea]

This idea is a function obtained by the above-mentioned configuration, and in particular, even if the load receiving shaft comes off against the user's will due to some unexpected situation during cargo handling, it can be mechanically prevented. The action of immobilizing the load bearing shaft occurs instantaneously, preventing the phenomenon of natural removal until the removal operation is performed, and is effective in completely eliminating the occurrence of major accidents.

[Brief explanation of drawings]

Figure 1 is a side view of the shaft in use, Figure 2 is a front view of the shaft, Figure 3 is a side view of the shaft as seen from the arm side,
FIG. 4 is a front view of the arm, and FIG. 5 is a plan view of the pin. 1... Hole, 2... Main body, 3... Vertical member, 4...
Insertion hole, 5...hole, 6...cylinder, 7...rod, 8...arm, 9...pin, 10...circular groove, 10a...horizontal recess, 11...protrusion, 12...
...Load bearing shaft, 12a...Head, 13...Vertical groove, 14...Pin, 15...Valve, 16...Pin.

Claims (1)

[Scope of utility model registration request] A hole 1 for attaching a hoisting rope is horizontally bored in the upper part of the main body 2. At the bottom of the main body 2, two vertical members 3 are provided facing downward at a constant interval in the center, and a load bearing is provided horizontally and coaxially on both vertical members 3. The shaft is provided through the insertion hole 4, and the load receiving shaft 12 is inserted across both insertion holes 4, and the main body 2 is inserted between the vertical member 3 and the hole 1.
A large diameter hole 5 is horizontally drilled in the hole 5, a fluid cylinder 6 is pivotally mounted in the hole 5, and a rod 7 of the fluid cylinder 6 is inserted into the hole 5.
An arm 8 is pivotally connected to the side surface of the main body 2 with a pin 9 at a position midway between the center position of the hole 1 and the top surface of the hole 5 on the side where the rod protrudes and enters, and the rod 7 is attached with a pin in the middle of the arm 8. A projecting piece 11 is attached to the inner side of the lower end of the arm 8, and has a horizontal recess 10a facing outward at the upper end thereof, and an arcuate groove 10 connected to the inner end thereof and curved outward. and inserting and fitting the projecting piece 11 into a vertical groove 13 provided in the head 12a of the load receiving shaft 12 protruding from the vertical member 3,
The pin 14 is inserted by aligning the shaft hole provided in the head 12a with the circular arc groove 10 having the horizontal recess 10a of the inserted protrusion 11.
and are connected so that they can rotate freely,
Valve 15 connecting the fluid hose to cylinder 6
A safety device for a shoe, characterized by comprising: