JPH0351577Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for sequentially operating two switching valves with a single lever.

The first conventional control device of this type.
As shown in the figure, the spool of one switching valve e is connected via a rod d to an arm c protruding from a boss b of a lever a, and the spool of one switching valve e is connected to an arm f of a boss b via a loose spring mechanism g. The spools of the switching valves h are connected together, or the switching valves m and n are connected to both ends of the link j via the rods l and k, as shown in Fig. 2.
There was one in which the lever o was connected to the lever o via a link p at a position offset from the center of the link j. In the switching valve control device shown in Fig. 1, when lever a is rotated, the spool of one switching valve e is actuated via rod d because there is a loose spring mechanism g, and then the loose spring mechanism The spool of the other switching valve h is actuated via g.

Further, in the control device for the switching valve shown in FIG. 2, when the lever o is rotated, the spool of the switching valve n is operated first depending on the link ratio of the link j, and then the spool of the switching valve m is operated.

Originally, the switching valves e, h, m, and n are provided with return springs that act on the spools, and when the switching operation of the switching valves e, h, m, and n is performed as described above, each spool is moved by the return spring. Therefore, the levers a and o had to be operated with a force that overcomes the spring force of these return springs, and the operating force for both control devices was large.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to provide a control device for a switching valve that can reduce operating force and can appropriately select this operating force.

Hereinafter, the present invention will be explained with reference to FIG. 3 and subsequent figures.

Reference numerals 1 and 2 in the drawings indicate first and second switching valves. 1st
The spool 3 of the switching valve 1 is connected to one end of the third link 5 via the first link 4, and the spool 6 of the second switching valve 2 is connected to the other end of the third link 5 via the second link 7. It is connected to the section.

Reference numeral 8 in the drawing indicates a mounting bracket, one end of a fourth link 9 is connected to the mounting bracket 8 by a pin 10, and a third link is connected to the middle part of the fourth link 9.
The intermediate portions of the links 5 are connected by pins 11. The pivot point of this third link 5 with the fourth link 9 is B,
If the pivot point between the third link 5 and the first link 4 is D, and the pivot point between the third link 5 and the second link 7 is E, the distance between the pivot points D and B is e ₁ . The distance e ₂ is increased.

In the drawing, reference numeral 12 denotes a locking bracket, one end of a spring 13 is locked to the locking bracket 12, and the other end of the spring 13 is connected to a fourth link 9.
The locking bracket 12 is locked at the other end, and the locking bracket 12 is located on an extension of a straight line connecting the fulcrum A and the pivot point B of the fourth link 9.

The other end of the fourth link 9 is connected to a hand lever 15 via a connecting member 14.

A return spring (not shown) acts on the spools 3 and 6 of the first and second switching valves 1 and 2.

Therefore, when the hand lever 15 is pulled, the fourth link 9 moves in the direction of the arrow around the fulcrum A, the third link 5 moves, and depending on the link ratio of the third link 5, the link is moved through the first link 4. The spool 3 of the first switching valve 1 is operated to move. Next, the second link 7
The spool 6 of the second switching valve 2 is operated to move via.

As above, pull the hand lever 15 and press the first and second levers.
When switching the switching valves 1 and 2, the spools 3 and 4 of the first and second switching valves 1 and 2 move against the return spring, and the operating force overcomes the spring force (return force) of these return springs. and hand lever 1
5, when the hand lever 15 is pulled and the fourth link 9 is rotated in the direction of the arrow, the force of the spring 13 acts in the direction of rotation of the fourth link 9. Therefore, the force obtained by subtracting the acting force of the spring 13 from the spring force of the return spring can be output as the operating force of the hand lever 15, and the operating force of the hand lever 15 is reduced compared to the conventional switching valve control device. Ru.

Furthermore, by changing the spring 13 to one with a different spring force, the operating force of the hand lever 15 can be appropriately selected.

Since the present invention has been described in detail above, when the hand lever 15 is pulled to switch the first and second switching valves 1 and 2, the spools 3 and 4 of the first and second switching valves 1 and 2 are returned. It is necessary to move against the spring and pull and operate the hand lever 15 with operating force that overcomes the spring force (return force) of these return springs, but by pulling and operating the hand lever 15, the fourth link 9 is moved in the direction of the arrow. When the fourth link 9 rotates, the force of the spring 13 acts in the direction of rotation of the fourth link 9, so the force obtained by subtracting the acting force of the spring 13 from the spring force of the return spring is applied to the hand lever 1.
It is enough to output it as the operating force of 5, and this hand lever 1
The operating force of 5 is reduced compared to conventional switching valve control devices.

Furthermore, by changing the spring 13 to one with a different spring force, the operating force of the hand lever 15 can be appropriately selected. In this way, the operating force can be reduced by the spring force of the spring 13, and by appropriately selecting the spring 13, the degree of reduction of the operating force can be freely selected.

[Brief explanation of the drawing]

1 and 2 are perspective views of a conventional switching valve control device, FIG. 3 is an explanatory diagram of the configuration of an embodiment of the present invention, FIG. 4 is a view taken from the direction of FIG. 3, and FIG.
The figure is a sectional view taken along the line of FIG. 1 is a first switching valve, 2 is a second switching valve, 4 is a first link, 5 is a third link, 7 is a second link, 9 is a fourth link, and 13 is a spring.

Claims (1)

[Scope of utility model registration request] A fourth link 9 is connected to the mounting bracket 8 so as to be rotatable around a fulcrum A, and the intermediate portion of the third link 5 is connected to the intermediate portion of the fourth link 9 with a pin 11, and this pin 11 is connected to the third link. 5, one end of the third link 5 is connected to the spool 3 of the first switching valve 1 via the first link 4, and the third link 5
The other end is connected to the spool 6 of the second switching valve 2 via the second link 7, and the first link 4 of the third link 5 is connected to the spool 6 of the second switching valve 2.
The distance l ₁ between the pivot points D and B of the third link 5 and the distance l 2 between the pivot points E and B of the second link 7 of the third link ₅ are made different, and the freedom of the fourth link 9 is made different. A control device for a switching valve characterized in that an end portion is connected to a hand lever 15 side, and a spring force is applied to the fourth link 9 by a spring 13 in the pulling side operation direction of the fourth link 9.