JPH03244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is applicable to operating lever mechanisms, particularly oil passage switching valves of cranes, shovels, bulkheads, and other construction machinery that operate actuators using hydraulic pressure. The present invention relates to an operating lever mechanism that has two functions: the lever mechanism not only allows oil passage switching operation to switch the pressure oil from the pump to operate a desired actuator, but also enables operation to increase the speed of the actuator. be.

(Prior Art) Conventionally, as a general operating lever device having two functions, for example, Japanese Patent Publication No. 49-7807 discloses that the accelerator of a tower-mounted engine can be accelerated by operating the operating lever in the same direction from the device operation switching position. It is known that the operating lever mechanism of the oil passage switching valve of construction machinery, etc. is configured so that the operating lever can be operated to increase the speed. It is known that the speed can be increased by operating a directional lever.

(Problems to be Solved by the Invention) However, conventionally known dual-function operating lever mechanisms have a complicated structure, require a large installation space, and are difficult to assemble and maintain.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems, and to provide a control lever mechanism with a compact structure, no assembly and maintenance problems, and excellent operability. It is said that

Therefore, according to the present invention, the operating lever 1 of the oil passage switching valve 6 provided between the hydraulic pump driven by the engine and the hydraulic actuator is further operated in the same direction from the oil passage switching position. In the operating lever mechanism, which has two functions, the operating lever 2, which is integrally provided with the operating lever 1, can be operated to increase the speed of a speed increasing device such as an engine accelerator by moving the lever to the second operating position. The actuating lever 1 is connected to the spool 7 of the oil passage switching valve 6 via the intermediate telescopic rod 5, and is also connected to the speed increasing device via the link 8. an inner rod 10 and an outer rod 11 which are removably inserted into the inner rod 10;
It consists of an elastic member 9 inserted between an inner rod and an outer rod, the inner rod 10 is connected to the oil passage switching valve spool 7, the outer rod 11 is connected to the operating lever 2, and the intermediate telescopic rod 5 is characterized in that it is configured to expand and contract against the spring force of the elastic member 9.

(Function) The operating lever mechanism configured as described above has a telescopic rod attached to one end 2a of the operating lever 2 by operating the operating lever 1 to swing the operating lever 2 in one direction or the other around the pivot pin 3. The spool 7 of the oil line switching valve 6, which is connected via 5, is switched into one or the other position, whereby the actuator of the crane is actuated. At the same time, the link 8 is also moved by the other end 2b of the operating lever 2, but at this time, a speed increasing device such as an accelerator connected via the link 8 is not operated. (See Figures 2 and 4).

From the above-described switching position of the oil passage switching valve 6, the operating lever 1 is further operated in the same direction to apply sufficient force to one end of the operating lever 2 to compress the elastic member 9 of the intermediate telescopic rod 5 against its spring force. , the actuating lever 2 is further swung around the pivot pin 3 against the spring force of the elastic member 9, and the link 8 is attached to the other end 2b of the actuating lever 2.
A speed increasing device, such as an accelerator, connected via the pump is actuated to increase the discharge flow rate of the pump and increase the operating speed of the crane actuator in a known manner (see FIGS. 3 and 5).

(Example) In the example shown in the drawings, the intermediate telescopic rod 5 is constructed of an inner rod 10 and an outer rod 11 into which the rod 5 is removably inserted, and the outer end 10a of the inner rod 10
is connected to the spool 7 by 12, and the outer rod 11a of the outer rod 11 is connected to one end 2a of the actuating lever 2 by a pin 13. inner rod 10
Annular spring seats 15 and 16 are slidably mounted on the upper small diameter portion 14, and a spring 9, which is an elastic member, is mounted between the spring seats 15 and 16. The spring seats 15 and 16 are connected to the stopper shoulders 17 and 1 at both ends of the small diameter portion 14.
Shoulders 1 are configured to be pressed by springs 9 to positions where they engage with the outer rods 11 and spring seats 15 and 16, respectively.
9, 20 are provided so that when a tensile force sufficient to compress the spring 9 is applied to the telescopic rod 5 by operating the operating lever 1, as shown in FIG. The telescopic rod 5 expands by engaging with the lever 1 to compress the spring 9, thereby allowing the operating lever 2 to swing further.As shown in FIG. When a sufficient pressing force is applied to the telescopic rod 5 to compress it, the shoulder 20
is engaged with the spring seat 16 to compress the spring 9 and contract the telescopic rod 5 to allow further rocking of the operating lever 2.

In the illustrated example, a spring is provided as the elastic member 9, but an elastic body such as rubber may also be used, and the spring force of the elastic member 9 is stronger than the spring return spring setting force of the oil passage switching valve 6. shall be.

Further, as in the illustrated example, the small diameter portion 14 of the inner rod 10 is formed of a spring, and the stopper shoulder portion 18 can be formed by the head of this screw. Spring force can be adjusted. Furthermore, in the illustrated example, the operating lever is constructed separately from the operating lever, and is configured to be connected at right angles to each other so that they move together; The lever can also be constructed as a collinear extension of the operating lever.

In the present invention, when switching the oil passage switching valve in which the operating lever 1 is operated to switch the oil passage switching valve 6 to operate the actuator of the crane, the oil passage switching valve is connected to the other end 2b of the operating lever 2 via the link 8. Although the case has been described in which the speed increasing device such as the accelerator does not cause a speed increasing effect, it is possible that the speed increasing device such as the accelerator is operated when the oil passage switching valve 6 is switched to cause a speed increasing effect, if necessary. Of course, it can be configured.

(Effects of the Invention) According to the present invention, effects such as a compact structure, easy maintenance, and easy assembly can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side view showing a part of the operating lever mechanism according to the present invention as a cross section, and FIGS. 2 to 5 are action explanatory views. 1...operation lever, 2...operation lever, 3...
Pivot pin, 4... Fixed support bracket, 5... Intermediate telescopic rod, 6... Oil passage switching valve, 7... Spool, 8... Link, 9... Spring and other elastic members.

Claims (1)

[Claims] 1. By further operating the operating lever of the oil passage switching valve provided between the hydraulic pump driven by the engine and the hydraulic actuator in the same direction from the oil passage switching position, the engine is moved to the second operating position. In a dual-function operating lever mechanism that enables speed-increasing operation of a speed-increasing device such as an accelerator,
An operating lever provided integrally with the operating lever is pivotally connected to a fixed support bracket by a pivot pin, and the operating lever is connected to the spool of the oil passage switching valve via an intermediate telescoping rod, and the speed increaser is connected via a link. It is connected to the device and consists of an inner rod and an outer rod into which the intermediate telescopic rod is removably inserted, and an elastic member inserted between the inner rod and the outer rod, and the inner rod is used as an oil passage switching valve. connected to the spool,
A dual-function operating lever mechanism, characterized in that an outer rod is connected to the operating lever, and the intermediate telescoping rod is configured to extend and contract against the spring force of the elastic member.