JPS642169Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to operating a control lever of a hydraulically driven working device.

(Prior art) Conventionally, in the case of a truck equipped with a crane, the engine power of the truck is converted into hydraulic power, and this hydraulic power is used to swing the crane post or extend/contract/raise/raise the crane boom. ing.

However, in order to operate this crane, in addition to appropriately selecting and operating the hydraulic control valve of the hydraulically driven working device, the operator also operates the accelerator of the engine to adjust the working speed as appropriate. Therefore,
It was a hassle to have to operate the control lever and the accelerator control lever at the same time.

(Example) The present invention has been made in view of the above points, and will be explained below with reference to the drawings. Reference numeral 1 indicates a rotation link 2 that is pivotally supported on the chassis of a truck-mounted crane;
An operating lever 3 is integrally fixed to this rotating link 1 so as to protrude to one side of the crane, and an operation lever 3 is pivoted to the other side of the crane via a connecting rod 4 to this rotating link 1. The levers 6 are connected to each other, and usually a plurality of operating levers 3 and 6 are installed in tandem. When these operating levers 3 and 6 are operated from both sides of the truck, a hydraulic control valve V, which will be described later, is switched and the crane post is activated. The boom can be rotated, extended and retracted, and raised and lowered.

Incidentally, the lower end of the rotary link 1 has a U-shaped notch, and the pin 7a of the connecting rod 7 is fitted into this U-shaped notch. The connecting rod 7 is connected to a spool 9 of a hydraulic control valve V via a bullet 8.

The biasing force of this bomb 8 is set to be larger than the biasing force of a spring (not shown) that attempts to maintain the spool 9 of the hydraulic control valve in the neutral position at all times.

The rotation links 1 are provided in correspondence with the number of operation levers 3, and are fixed to collars 10 that are rotatably fitted around the pivot shaft 2, and are attached one-to-one to the selected operation lever 3. The hydraulic pressure control valve V is rotated about the pivot shaft 2 in response to the change in pressure, thereby switching and controlling the desired hydraulic control valve V.

Further, a first operating arm 11 is provided at the upper end and lower end of the pivot shaft 2 so as to sandwich the three groups of operating levers.
A substantially central portion of the second operating arm 12 is rotatably supported, and pipes 11a and 12a serving as locking members are fixed to the tip portions thereof.

The other ends of the first actuating arm 11 and the second actuating arm 12 are provided with respective tips of an inner member 14a and an outer member 14b of a control cable 14 connected to an accelerator lever 13 of an engine E, which will be described later. connected.

Further, at the base end of the control cable 14, an inner member 14a is connected to the accelerator lever 13 of the engine E, and an outer member 14b is fixed to a proper position on the engine E.

Reference numeral 15 denotes a stopper that restricts the first operating arm 11 and the second operating arm 12 from moving together.

Next, the operation of the present invention will be explained. When the operation lever 3 is rotated clockwise, the rotation link 1 integrated with the operation lever 3 rotates around the pivot shaft 2. At this time, as the rotation link 1 rotates,
The connecting rod 7 will be pulled to the left, but since the biasing force of the bomb 7 is greater than the operating force required to switch and control the spool 9 of the hydraulic control valve V, the spool 9 will also be pulled to the left at the same time. and the hydraulic control valve V is switched to one position. Here, when the operation lever 3 is further rotated clockwise, the rotation link 1 engages the locking member 11a of the first actuation arm 11, causing the first actuation arm 11 to swing clockwise. As a result, the inner member 14 of the control cable 14 connected to the other end of the first actuating arm 11
Pull a to the left and swing the accelerator lever 13 counterclockwise.

Therefore, the accelerator lever 13 can bias the engine E from an idling state to a constant speed increase state according to the amount of operation of the operating lever 1, and can adjust the working speed of the crane.

At this time, since the spool 9 of the hydraulic control valve V has stopped at its stroke end, the operating lever 3
The rotational operation caused by this is absorbed by the elongation of the ammunition 8.

On the other hand, when the operating lever 3 is rotated counterclockwise, the spool 9 is pushed left and right via the connecting rod 7 and the bullet 8, and the hydraulic control valve V is controlled to be switched to the other position.

Thereafter, when the operating lever 3 is further rotated counterclockwise, it engages the locking member 12a of the second operating arm 12 and swings the second operating arm 12 counterclockwise. As a result, the control cable 14
The outer member 14b is compressed against the biasing force of the ammunition 8.

This rightward compression of the outer member 14b bends the control cable 14, so that the inner member 14a is pulled relatively by the amount of the outer member 14b being pushed out, causing the accelerator lever 13 to swing in the same manner as described above. As a result, the engine E is urged to an accelerating state.

(Effects of the invention) As described above, according to the operating lever device of the present invention, in addition to switching the hydraulically driven working device, it is also possible to adjust the working speed with a single operating lever. can be significantly improved.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is an overall front view of the operating lever device, and FIG.
The figure is a plan view thereof. 1... Rotating link, 3, 6... Operation lever, 8
... Bomber, 11 ... First actuation arm, 12 ... Second actuation arm, 14 ... Control cable,
V...Hydraulic control valve.

Claims (1)

[Claims for Utility Model Registration] (1) A rotary link linked to the rotary operation of the operating lever, and a first rotary link pivotally supported on the rotary shaft of the rotary link.
The first actuating arm and the second actuating arm are composed of an actuating arm, a second actuating arm, a control cable connected to the accelerator lever of the engine, and a bullet disposed between the link and the spool of the hydraulic control valve. The links are arranged to counter each other in a balanced manner, and the other of the first actuating arm and the second actuating arm are respectively connected to the outer member and the inner member of the control cable, and the hydraulic pressure is controlled by operating the operating lever. An operating lever device characterized by controlling the switching of a valve and further controlling the speed of the engine after switching the hydraulic control valve. (2) A plurality of said operation levers are provided on at least one of the left or right side of the vehicle, and a plurality of rotation links and hydraulic control valves are arranged corresponding to the operation levers, and a plurality of rotation links and hydraulic control valves are arranged in correspondence with the operation levers, and a plurality of rotation links and hydraulic control valves are provided in correspondence with the operation levers, and a plurality of rotation links and hydraulic control valves are provided corresponding to the operation levers. The operating lever device according to claim 1, wherein a desired hydraulic control valve is switched and controlled by the lever. (3) The biasing force of the projectile is greater than the biasing force of a spring disposed on the hydraulic control valve to hold the spool of the hydraulic control valve in the neutral position. operating lever device.