JPS6010913Y2 - Operation structure of work vehicle - Google Patents

Description

[Detailed description of the invention] The present invention provides safety by preventing the operator from accidentally touching the operating tool when getting on or off the vehicle, operating the operating tool, and erroneously activating the device. The purpose of the present invention is to avoid the problem of decreased operability resulting from the configuration.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

A swivel base 2 is attached to a traveling vehicle body equipped with a crawler traveling device 1.
A driver's seat 3 and an operating section 4 are provided on the swivel base 2, and an excavation device 5 is provided in front of the swivel base 2, and the traveling device 1, the swivel base 2, and the excavation device 5 is configured to be driven by hydraulic pressure, which is an example of a fluid pressure type, and thus can be used as a work vehicle for ground excavation work.

The excavation equipment 5 has a boom 7 pivotably connected to a bracket 6 so as to be able to freely swing up and down, an arm 8 to the boom 7, and a packet 9 to the arm 8 pivotably connected,
Hydraulic cylinders 10 and 11 are provided for the bracket 6 and the boom 7, the boom 7 and the arm 8, and the arm 8 and the packet 9, respectively.
．． 12 is provided to drive and swing the boom 7, arm 8 and packet 9, respectively, so that the packet 9 can perform ground excavation work. It is designed so that it can be slid and fixed freely to allow digging of side ditches.

The driver's seat 3 is disposed on the swivel base 2 so as to be freely displaceable over a predetermined range in the vertical direction, and a compression spring 13.13 is interposed between both 2 and 3, so that when the driver is not seated, the urging force of the spring 13.13 is located above, on the other hand,
In the seated state, the seat 3 is moved downward against the biasing force of the spring 13. It is configured to detect based on displacement.

An operating member 14 is provided protruding from the seat 3, and the operating member 14
An on-off valve 15 is provided in close proximity to the operating member 14, and is arranged to be closed as the operating member 14 moves upward, and opened as the operating member 14 moves downward. 1. It is installed upstream of the main valve (2) in the hydraulic circuit of the swivel table 2 and the excavation device 5, and only when the driver is seated on the driver's seat 3, the traveling device 1, the swivel table 2, and the excavation device are operated. On the other hand, when the user is not seated and leaves the seat 8 with the main valve ■ open, even if the operating tool 16 in the control section 4 is operated unexpectedly. Also, a safety mechanism 17 is configured to prevent the traveling device 1, the swivel table 2, and the excavating device 5 from being activated.

The on-off valve 15 has a piston 19 inside the cylinder 18.
are interlocked and connected in a state where they are always urged to move to the closed side by a spring 20, the damper oil is filled in the cylinder 18, and a bypass path R is provided with a one-way valve 21 interposed between both cylinders IRs and R2. In addition to being connected, a small hole 22 is formed in the piston 19 to communicate with both cylinder chambers R□ and R2, and the piston 19 is connected to the downward displacement of the seat 3 based on the load applied to the seat 3 when the driver is seated. The oil is caused to flow from the cylinder chamber R2 to the cylinder chamber R□ through the bypass path R and the small hole 22, and while the on-off valve 15 is quickly switched to the open state, the seat 3 is placed in a no-load state, such as when the driver is not seated. , the biasing force of the spring 20 causes the cylinder chamber R1 to move from the cylinder chamber R1 to the cylinder chamber R1.
The oil flows only through the small hole 22 to the on-off valve 1.
5 is configured to slowly switch the on-off valve 15 to the closed state, so that if the driver leaves the seat 3 or the seat 3 remains unloaded for more than a set time, the on-off valve 15 is securely switched to the closed state. If the seat 3 remains unloaded for less than the set time, such as when the driver's weight is lifted for a short period of time due to vibrations while the vehicle is running or the driver tends to stand up to check the excavated area, the on-off valve 15 The maintenance mechanism 23 is configured to maintain the traveling device 1, the swivel platform 2, and the excavating device 5 in an operable state regardless of whether the next load is applied to the seat 3 or not until the seat 3 is closed. It is.

In configuring the maintenance mechanism 23, for example, if the diameter of the small hole 22 formed in the piston 19 is appropriately set in advance, the on-off valve 15 can be maintained in the open state for a desired set time. In addition, if the on-off valve 15 is operated electrically as a solenoid valve without using such a mechanical maintenance mechanism, after detecting the no-load state on the seat 3, a timer is activated and the setting is performed. Various structural modifications are possible, such as demagnetizing the solenoid and closing the on-off valve 15 only when the operation continues for more than a certain period of time.

In the above embodiment, based on the load on the seat 3, the traveling device 1,
Although the swivel table 2 and the excavation device 5 are configured so that they can be operated while seated, the traveling device 1 and the swivel table 2
In short, it is sufficient that at least a part of the operation system of either the excavation equipment 5 or the boom cylinder 10 of the excavation equipment 5 can be operated in a seated state; The devices 1.2. 5 may be mechanically unlocked or locked based on the load on the seat 3.

In summary, the operating structure of the work vehicle according to the present invention detects whether or not the driver is seated based on the load on the driver's seat 3, The safety mechanism 17 is provided with a mechanism 23 that maintains the operating system in an operable state even if no load is placed on the driver's seat 3 within a set time in the seated state. It is characterized by

In other words, the safety mechanism 17 prevents the operating system from being operated while the driver is away from the seat 3, thereby ensuring that the driver does not accidentally touch the operating tool 16 and accidentally activate the device when getting on or off the vehicle. I was able to make it safer.

Moreover, in order to ensure the above-mentioned safety, even if no load is detected on the driver's seat 3, the operating system is maintained in an operable state as long as it is within a set time.
For workers who often travel on rough terrain, the load on the driver's seat 3 is reduced due to vibrations caused by the travel, and as a result, the safety mechanism 17 is activated sensitively as the no-load state is detected, and the operation system is activated. This has made it possible to avoid unexpected situations such as interruptions in operation due to disconnection, and a decrease in operability.

[Brief explanation of drawings]

The drawings show an example of the operator operation structure according to the present invention,
FIG. 1 is an overall side view of the worker, and FIG. 2 is a partially cutaway side view of the main parts. 3...driver seat, 17...safety mechanism,
23... Maintenance mechanism.

Claims (1)

[Scope of utility model registration request] A safety mechanism 17 is provided that detects whether or not the driver is seated based on the load on the driver's seat 3 and enables at least a part of the operation system to be operated only in the seated state, and a safety mechanism 17 that detects whether or not the driver is seated based on the load on the driver's seat 3, and enables operation of at least a part of the operation system only in the seated state. An operator operating structure characterized in that the safety mechanism 17 is provided with a mechanism 23 that maintains the operating system in an operable state even if no load is placed on the driver's seat 3.