JPS5810769Y2 - Work vehicle arm lowering prevention structure - Google Patents

Description

[Detailed description of the invention] This invention consists of a boom and an arm, and is attached to a vehicle body so that it can be driven up and down, flexed and extended, and rotated around a vertical axis using a hydraulic actuator. Regarding the structure of preventing the arm from descending with a coupling device that can be released when the arm is lifted from the ground, we effectively utilize the original configuration of this type of work vehicle and have a simple structure that requires as little modification as possible to prevent the arm from falling when it is lifted from the ground. The purpose is to prevent the arm from unexpectedly descending.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A transporting device 2 is provided at the front of a traveling vehicle body equipped with a crawler traveling device 1, and an excavating device 3 is provided at the rear, and a driver seat 4 is provided between both working devices 2 and 3 so as to be changeable in the forward and backward direction. The work vehicle is configured so that it can perform both transportation and ground excavation work with a single vehicle.

The excavation device 3 has a working arm 7 formed by pivotally connecting a boom 5 and an arm 6 to each other so as to be able to swing freely. A hydraulic cylinder 10 as an example of a fluid pressure actuator is provided between the base 8, the boom 5 and the arm 6, and between the arm 6 and the packet 9.
, 11 and 12 are interposed, and the work arm 7 is driven to move up and down, oscillate, bend and extend, and the packet 9 is driven to move to perform ground excavation work.

A frame 13 with outriggers is provided in a row at the rear of the running vehicle body, and guides (not shown) extending in the lateral direction are provided above and below this frame 23, and the frame 23 is slidable along the guides (not shown) so that its position can be changed in the lateral direction. A bracket 15 is provided, and the base 8 is attached to the slide bracket 15 so that the vertical axis 4
The excavator 3 is mounted so that it can rotate freely around the periphery, so that the excavation device 3 can be moved laterally and rotated to dig ditches and expand the work range, and the base 8 can be positioned laterally to The working arm 7 is directed to the other side, and the excavating device 3 is configured to be placed in a compact storage position within the width of the vehicle body.

A hydraulic actuator 16 is attached to the base 8, which includes a rack gear that bears the pinion shaft attached to the slide bracket 15 and engages the pinion shaft, and a cylinder chamber formed at both ends of the rack gear for driving the rack gear. , the base 8 is driven and rotated around the vertical axis 4 corresponding to the axis of the pinion shaft by the operation of the fluid pressure actuator 16.

Attach the bracket 18 to the swing drive actuator 16' by tightening the mounting bolts 17 to the base 8 together with the bracket 18 with one end extending toward the boom 5 mounting side. A chain 19 is attached to the tip of the arm cylinder 11, and a connecting portion 21 capable of latching and locking the chain 19 is provided at one end of a support shaft 20 for attaching the proximal end of the arm cylinder 11 to the boom 5. The chain 19 is connected to a support shaft 20, and the boom 5 is connected to the vehicle body in a state where it is raised above the ground, so that its lowering can be mechanically prevented.

An angle-shaped locking member 23 is attached to the upper part of the swing drive actuator 16 together with a lid 22 that closes the bearing portion of the pinion shaft, and the chain 19 is attached to the locking member 23 when not in use. It is configured to be latched onto.

To connect the working arm 7 to the vehicle body side, the work arm 7 is not limited to the chain 19, but may also be a wire, a rod, etc., and these are collectively referred to as the connecting tool 19.

In summary, the present invention provides the above-mentioned arm lowering prevention structure for a working vehicle, in which the bracket 18 to which the connector 19 is attached is fastened together with the swing drive actuator 16, and the arm drive mechanism for the boom 5 is It is characterized in that the connecting tool 19 is configured to be able to be connected to and removed from the support shaft of the actuator 11.

In other words, the bracket 18 is mounted by effectively utilizing the original mounting configuration for mounting the swing drive actuator 16, and the support originally provided for mounting the arm drive actuator 11 on the boom 5 is used. Since the connecting tool 19 is connected to the shaft 20, a special mounting structure for attaching the bracket 18 and a special connecting structure for connecting the connecting tool 19 to the working arm 7 can be made unnecessary. Preventing the arm 7 from descending while lifted from the ground has been achieved with as little modification as possible and with a simple structure.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the arm lowering prevention structure for a working vehicle according to the present invention, in which FIG. 1 is an overall side view of the working vehicle, FIG. 2 is a perspective view of the main parts, and FIG. 3 is an arm drive actuator. FIG. 3 is a partially cutaway plan view showing a pivot point to the boom. 5...Boom, 6...Arm, 7...
...Working arm, 10...Boom drive actuator, 11...Arm drive actuator, 16...Turning drive actuator, 18...・Bracket, 19...Connector, chain, 20...Spindle, 22...
・Other members, 23...Locking member.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A vehicle body that is separated from the boom 5 and the arm 6, and that can be driven vertically, oscillate, bend, and rotate around the vertical axis by hydraulic actuators 10, 11, and 16. It has a structure in which the work arm 7 attached to the ground is prevented from descending by a connecting tool 19 that can be released from the work when it is lifted from the ground, and the bracket 18 to which the connecting tool 19 is attached is tightened together with the swing drive actuator 16. An arm lowering prevention structure for a working vehicle, characterized in that the connecting tool 19 is attached to the boom 5 in a state where it is attached to the boom 5, and the connecting tool 19 can be freely connected to and detached from the support shaft of the arm driving actuator 11 with respect to the boom 5. ■ The connecting tool 19 is a chain, and the chain 1
9 is attached to the bracket 18 when not in use.
The structure according to claim 2 of the utility model registration claim, characterized in that the structure is provided near the other member 22 in a co-tight state.