JPS5911508B2 - Bar hanging tool for crane work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting device for suspending bar materials such as sheet piles and steel frames by wire ropes in crane operations.

When lifting bar materials such as sheet piles and steel frames with a crane,
As a general rule, it is strictly recognized that suspended loads should not pass over other workers, but there are times when it is unavoidable for work to pass over someone's head.

For example, during work such as steel frame erection and sheet pile driving, proximity and contact between suspended loads and human bodies is unavoidable, considering efficiency and other various conditions.

In short, it is always dangerous work.

An object of the present invention is to provide a hanging tool that reliably prevents the above-mentioned dangers and allows safe work.

In order to satisfy the above object, the present invention is constructed as follows.

That is, the present invention has a pair of racks 2 and 3 with hooks 1 suspended from the lower ends for hooking the wire rope R to be wound around the bar S, and shafts 6 of pinions 4 and 5 that engage with the racks 2 and 3.
A large-diameter pinion 7 is fixed to the frame body 8, and a rack 9 is provided vertically and supported by the frame body 8 in parallel with the racks 2 and 3 that mesh with the large-diameter pinion 7. A tension arm 10 for pressing the wire rope R against the bar S is provided below, and a lifting spring 11 for the racks 2 and 3 is suspended from a guide tube 14 provided vertically on the frame 8 via an adjustment screw 15. And the spring 11
and the racks 2 and 3, and further connect each of the racks 2 and 3.
This is a bar hoisting tool for crane work, characterized in that a frame body 8 is provided with a plurality of guide rollers 17 that abut against the guide rollers 17 and 9.

In the figure, reference numeral 12 indicates a restraining piece for the racks 2 and 3, and reference numeral 13 indicates a pivot portion of the tension arm 10. The tension arm 10 swings its head from side to side about the pivot portion 13 as a fulcrum, as shown in FIG.

14 is a spring 110 guide cylinder, 15 is a spring 110 strength adjusting screw, and the spring 11 has the function of pulling up the racks 2 and 3 when the load is zero.

16 is a bearing of the shaft 6, 17 is a rack guide trochanter, 18 is a protrusion for correcting the orientation of the bar S, 19 is a key, and 20 is a hook locking rod for a crane or the like.

Since the present invention has the configuration described above, the pinions 4, 5
For example, the ratio of the pitch circle between the large diameter pinion 7 and the large diameter pinion 7 is 1
:5, and assuming that a bar material S weighing 1000 kg is lifted, the hook 1 is first pulled and the racks 2 and 3 are lowered, so the pinion 4.5 rotates and the large diameter pinion 7 of the coaxial 6 cooperates. do.

Therefore, if racks 2 and 3 are lowered, for example, by 150 mm, rack 9 will be lowered by 750 mm, which is 5 times, and the difference is 6
Since the rack 9 is lowered by an additional 00 hours, the tension arm 10 presses the winding part of the wire rope R wound around the bar S.
Wrapping involves wrapping around parts to ensure tightness.

Therefore, the wire rope R does not slacken during marking, and the work can be continued safely.

Note that when the wire rope R is tightened, the length of the wire rope R must be shorter than the amount of movement of the rack 9 (for example, 600 mm in the above case) so that the wire rope R does not slacken. The rope R will not sag and will be pulled together at the top and bottom.

In particular, according to the invention, the spring 11 connected to the racks 2, 3
A strength adjustment screw 15 is provided on the wire rope R, and a guide trochanter 17 is brought into contact with each rack 2, 3, and 9.
The tightening can be performed more smoothly, and the tightening force can be adjusted to be strong or weak.

[Brief explanation of the drawing]

The drawings show one embodiment of the crane work bar holder according to the present invention, and FIG. 1 is a sectional view taken along the line A-A' in FIG. 2, and FIG. 2 is a sectional view taken along the line BB' in FIG. A line sectional view, FIG. 3 is a bottom view, and FIG. 4 is a perspective view of the rod material being held. S... Bar material, R... Wire rope, 1
...Hook, 2, 3...Rack, 4,
5...Pinion, 6...Shaft, 7...
...Thick diameter pinion, 8...Frame body, 9...
...Rack, 10...Tension arm, 11...
- Spring, 14... Guide tube, 15... Adjustment screw, 17... Guide trochanter.

Claims (1)

[Claims] 1 A hook for the wire rope R to be wrapped around the bar S is equipped with a pair of racks 2゜3 with a hook 1 hanging from the lower end, and a pinion 4゜5 with a large diameter shaft 6 that engages with the racks 2 and 3. The pinion 7 is fixed and pivotally supported on the frame 8, and a rack 9 supported vertically on the frame 8 is provided in parallel with the rack 2.3 that engages with the large diameter pinion 7. A tension arm 10 is provided to press the wire rope R against the bar S, and a lifting spring 11 for the racks 2 and 3 is suspended from a guide tube 14 vertically installed on the frame 8 via an adjustment screw 15. A bar suspension for crane work, characterized in that a spring 11 and racks 2, 3 are connected, and a frame body 8 is provided with a plurality of guide rollers 17 that abut on each of the racks 2, 3 and 9. Ingredients.