JPH0340867Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention is a cylinder rod that operates the arm of a working machine such as a crane arm or a backhoe boom mounted on a construction machinery vehicle. This relates to a safety device that is fitted into the rod and prevents the rod from falling naturally.

(Prior Art) Conventionally, as shown in FIG. 3, a safety device 14 is attached to the rod of a cylinder 13 that operates an arm 12 of a crane as an arm of a working machine mounted on a construction machinery vehicle 11 such as a wheel loader. It is fitted. As shown in FIG. 4, this safety device 14 is sandwiched between the upper end of the cylinder body 13a and the tip pin 15 of the rod 13b to prevent the rod 13b from falling naturally.
2 prevents the roof 16 from accidentally falling down during vehicle repair work or transport, protects the worker, and protects the roof 16.
This is to prevent damage to the product.

The conventional safety device includes a brace body 21 located on one side of the rod 13b as shown in FIG.
, the U bolt 22 located on the other side of the rod 13b
is inserted, and by tightening two nuts 23, the integrated brace body 21 and U bolt 22 are fitted to the outer periphery of the rod 13b.

(Problems to be solved by the invention) As described above, since the conventional safety device is constructed using the U bolt 22, it is necessary to tighten it with nuts at two places, so it is not easy to install. There is also a high risk of the U-bolt falling off due to loosening of the nut.

The object of the present invention is to provide a safety device that is easy to install with bolts and that even if the bolts come off, the brace body does not fall off the cylinder rod and can reliably fulfill its original role.

[Structure of the idea]

(Means for Solving the Problems) The present invention is directed to a rod 1 of a cylinder 13 that operates an arm 12 of a working machine mounted on a construction machinery vehicle 11.
In the safety device 14 that is fitted to the rod 13b and prevents the rod 13b from falling naturally, the rod 13b
A brace body 31 to be fitted is formed in a concave shape, a magnet 32 is fixed to the inner surface of the brace body 31, a bolt 34 is inserted into the opening of the brace body 31, and this bolt 34 is inserted into a nut 35. It is fixed by

(Function) According to the present invention, even if the nut 35 comes off from the bolt 34 and this bolt 34 also falls off from the brace body 31, the brace body 31 will not be able to connect to the magnet 3.
It is held on the outer peripheral surface of the rod 13b by the suction force of 2, and does not fall off from the rod 13b, and can fulfill its original role of locking the arm 12 of the working machine at a predetermined angle.

(Example) Hereinafter, the present invention will be described in detail with reference to an example shown in FIGS. 1 and 2.

Brace body 3 fitted to the rod 13b
1 is formed in a concave shape. This brace body 3
A plate-shaped magnet 32 is fixed to the inner surface of the cylinder 13, and a thin layer of urethane rubber 33 is attached to the three surfaces of the magnet 32 that come into contact with the rod 13b of the cylinder 13 to protect the rod. A three-sided magnet 32 is attracted to the rod 13b through the magnet 32. A bolt 34 is inserted into the remaining opening of the brace body 31 and fixed with a nut 35.

Therefore, if for some reason Natsuto 35
Even if the bolt 34 comes off from the bolt 34 and this bolt 34 also falls off from the brace body 31, the brace body 31 will be able to hold the rod 1 due to the attraction force of the magnet 32.
The arm 12 of the crane is held on the outer peripheral surface of the rod 13b and does not fall off from the rod 13b.
lock at a predetermined angle.

Note that the magnet 32 may be a rubber magnet, in which case urethane rubber is not required.

Furthermore, this safety device can also be used when inspecting or repairing the crane with the arm 12 raised. In such a case, the vertically long brace body 3 that fits the raised rod 13b
Use 1.

[Effect of idea]

According to the present invention, since the brace body is formed in a concave shape, a normal bolt can be inserted into the opening of the brace body and fixed with one nut, making it easy to install the safety device. . Furthermore, since the magnet is fixed to the inner circumferential surface of the brace body, even if the bolts and nuts become loose or fall off, the brace body maintains contact with the rod of the cylinder due to the attraction force of the magnet. Natural fall of the lever rod can be reliably prevented and safety can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the safety device of the present invention, Fig. 2 is a cross-sectional view taken along the line - - in Fig. 1, and Fig. 3 is a perspective view of a crane mounted on a construction equipment vehicle.
Figure 4 is a front view of the installation part of the safety device, Figure 5
The figure is a plan view of a conventional safety device. 11...Construction machinery vehicle, 12...Crane arm as an arm of a working machine, 13...Cylinder,
13b... Rod, 31... Brace body, 32
...Magnet, 34...Bolt, 35...Natsuto.

Claims (1)

[Scope of utility model registration request] In a safety device that is fitted to a rod of a cylinder that operates an arm of a working machine mounted on a construction machinery vehicle and prevents the rod from falling naturally, a brace body that is fitted to the rod is formed in a concave shape, A safety device characterized in that a magnet is fixed to the inner surface of the brace body, a bolt is inserted into an opening of the brace body, and the bolt is fixed with a nut.