JPS6038783Y2 - Work equipment fall prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fall prevention device for a working machine such as a dozer shovel.

In a dozer excavator, as shown in Fig.
Maintenance and inspection work is often carried out with the machine raised, and it would be extremely dangerous if the work implement a were to fall for some reason.

To prevent such a situation, a fall prevention device is required.

Conventional fall prevention devices of this type include one in which a stay d is inserted between a lift arm b and a lift cylinder C to prevent falls, as shown in Fig. 2, and one in which a stay d is inserted between a lift arm b and a lift cylinder C to prevent a fall, as shown in Fig. 3. There is a mechanism in which a pin e is inserted under b and the pin e is held by the frame, and a lever f connects the frame side and lift arm b to prevent it from falling, as shown in Fig. 4.

In the case of the set of stays shown in Fig. 2, the stay d may collide with the cylinder rod C' of the lift cylinder C as shown in Fig. 5, which tends to damage the cylinder rod C' and also impairs the performance of the work machine. Naturally, the stroke of the lift cylinder C increases in order to increase the cylinder stroke, and in order to compensate for this large cylinder stroke, the stay d is also lengthened, resulting in an increase in the weight of the stay when considering buckling strength and the like.

If the stay d is heavy and difficult to install, it will not ensure safety and will have the opposite effect.

Moreover, if the weight of the stay d becomes heavy, it becomes difficult to store it, and there are many restrictions in terms of space.

Furthermore, since the stay d is mounted on the cylinder rod C', it is dangerous that it may come off during use.

As shown in FIG. 6, a method of fixing with U-bolts h has been used, but it still requires tools and is not easy to remove and install.

In addition, the pin-type device shown in FIG. 3 requires sufficient strength for the pin holding portion, and the lever-type device has a complicated structure and is expensive.

The present invention was developed in view of the above circumstances, and its purpose is to allow the stay to be attached to the lift cylinder rod without damaging the rod, and to shorten the stay, reducing weight and making it easier to carry. An object of the present invention is to provide a fall prevention device for a work machine that can be easily stored.

Hereinafter, the present invention will be explained with reference to FIG. 7 and subsequent figures.

In the drawings, reference numeral 1 denotes a bracket portion of a vehicle body 2, and a lift arm 3 is provided on the bracket portion 1 via a pin member 4 so as to be movable up and down.

A pivot portion 5 is formed at the lower portion of the lift arm 3, and an abutment portion 6 is formed at the rear lower portion of the lift arm 3.

A base end portion of a lift cylinder 7 is pivotally supported on the vehicle body 2.
The rod 8 of the lift cylinder 7 is attached to the pivot portion 5 of the lift arm 3 with a pin member 9.

10 in the drawing is a stay, and this stay 10 has a stay body 1 having an inverted U-shaped cross section as shown in FIGS. 8 and 9.
1, a handle 12 for carrying is attached to the top of the stay body 11, and a handle 12 for carrying is attached to the top of the stay body 11.
A hole 13 for storage is provided on the side surface.

A crimping member 14 made of an elastic material such as rubber is fixed to the inside of both ends of the stay main body 11, and protrusions 15 for preventing falling are protruded from the inner side of the crimping member 14 at opposing positions. .

Further, the lower corner portions at both ends of the stay main body 11 are covered with pressure bonding members 14.

A storage mechanism 16 for the stay 10 is provided on the side of the vehicle body 2.

As shown in FIG. 10, the storage mechanism 16 includes a pin body 17 fixed to the vehicle body 2, and an insertion hole 19 for an Ichikawa pin 18 is bored at the end of the pin body 17.

The stay 10 is attached to the pin body 17 through the hole 13, and the Ichikawa pin 18 is inserted into the insertion hole 19.

For removal, the Ichikawa pin 18 may be a beta pin as shown in FIG.
As shown in the drawings and FIG. 13, a screw 20 may be formed at the tip of the pin body 17 and tightened with a nut 21.

In addition, the mechanism for preventing removal is the pin body 1 as shown in Fig. 14.
7 with a claw 23 that can be raised by a spring 22,
As shown in FIGS. 15 and 16, a spring body 24 may be provided at the tip of the pin body 17, and the spring body 24 may be pushed down into the hole-shaped portion 25.

Therefore, to remove the Ichikawa pin 18, remove the stay 10 from the pin body 17, fit the stay 10 to the rod 8 of the lift cylinder 7 at the crimping member 14, retract the lift cylinder 7, and retract the contact part of the lift arm 3. A stay 10 is interposed between the lift arm 6 and the tip of the lift cylinder 7 to prevent the lift arm 3 from falling.

Since the stay 10 contacts the rod 8 with the crimping member 14, the rod 8 is not damaged, and the protrusion 15 of the crimping member 14 presses against the rod 8 to prevent the stay 10 from being pulled out.

As described in detail above, the present invention includes a stay 10 having a crimping member 14 made of an elastic material that is crimped to a rod 8 of a lift cylinder 7 on the inner side of both ends of a stay main body 11 that is a cylindrical body with an inverted U-shaped cross section. The lift arm 3 is characterized in that it has a contact part 6 which extends rearwardly and comes into contact with an end of a stay 10 attached to a rod 8 of a lift cylinder 7 at the rear part of the lift arm 3.

Therefore, the rod 8 of the lift cylinder 7 of the stay 10
Because of the crimp member 14, the rod 8 will not be damaged when attached to the rod 8, and the stay 10 will not fall off simply by fitting it onto the rod 8, eliminating the need for tightening with U-bolts or the like.

Further, since the lift arm 3 is provided with an abutting portion, the stay 10 is shortened and the weight is reduced, making it easier to carry and store.

[Brief explanation of the drawing]

Figure 1 is a side view of a dozer shovel, Figures 2 to 4 are explanatory diagrams of a conventional work machine fall prevention device, Figure 5 is an explanatory diagram of the state of interference between the stay and cylinder rod, and Figure 6 is an explanatory diagram of the state of interference between the stay and the cylinder rod. An explanatory diagram of a device for attaching the stay to the cylinder recess, FIG. 7 is a side view of the present invention-embodiment, FIG. 8 is a side view of the stay 10,
FIG. 9 is a front view of the same, FIG. 10 is an explanatory diagram of the structure of the stay retraction mechanism, FIG. 11 is an explanatory diagram of another embodiment of the Ichikawa pin, and FIGS. An explanatory diagram of an embodiment of the stopper part, FIG. 16 is a view taken from the direction of arrow A in FIG. 15. 6 is a contact part, 10 is a stay.

Claims (1)

[Scope of utility model registration request] The stay 10 is made of a cylindrical body with an inverted U-shaped cross section, and a crimping member 14 made of an elastic material that is crimped to the rod 8 of the lift cylinder 7 is provided on the inside of both ends of the stay body 11. A fall prevention device for a work machine, comprising a contact portion 6 that protrudes and abuts an end of a stay 10 attached to a rod 8 of a lift cylinder 7.