JPH0142405B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) This invention provides, for example, when operating a switching valve with an operating lever, even if the stroke of the operating lever is larger than the stroke of the switching valve, the stroke difference is This invention relates to an operating device that is capable of absorbing.

(Prior Art) For example, in a dump truck or the like, there is a control device that selectively operates two types of switching valves using a single operating lever. This control device has a hollow slider with a through hole bored in one place slidably inserted into a hollow case having one groove in the inner wall, and an operating member having one small diameter part inside the slider. A ball is slidably inserted and inserted between the through hole and the small diameter portion or between the through hole and the groove, and a position where the groove and the through hole coincide. In this case, the slider is restrained from sliding in one direction with respect to the case.

When the operation member is connected to the slider by the ball, the slider is slid by pushing the operation member toward the other side or pulling it conversely, and the one switch connected to the slider is caused to slide. The valve can be switched, and if the ball is pushed out of the small diameter portion to release the connection of the operating member to the slider, the operating member can be pulled in one direction or pushed in the opposite direction. The other switching valve connected to the operating member can be switched.

(Problem to be Solved) By the way, when connecting a switching valve to the slider of such a control device and connecting an operating lever to the operating member to form an operating device, and switching the switching valve using the operating lever, ,
If the stroke of the operating lever is larger than the stroke of the switching valve, even if the excess stroke of the operating lever in the one direction can be absorbed, the excess stroke in the other direction cannot be absorbed.

(Means for Solving the Problems) The present invention was made in view of the above-mentioned circumstances, and includes a hollow case with a groove formed in the central inner wall, and a case that is slidably inserted into the case and sandwiched between the grooves. A hollow slider with two through holes drilled at intervals, and a small diameter part that is slidably inserted into the slider and has a small diameter part having the same length as the interval between the through holes in the middle part. At the same time, an operating member having a large diameter part is provided outside the small diameter part, a stopper is provided at both ends of the case and limits the stroke of the slider, and a stopper is fitted between the through holes and the small diameter part. and a ball connecting the slider and the operating member, and when the operating member is forcibly slid against the slider at the stroke end of the slider, one of the balls connects the slider and the operating member. Fitted between the through hole and the groove, the operating member is disengaged from the slider;
It is an operating device.

(Function) When the operating member is forced to slide against the slider at the stroke end of the slider, one of the balls is pushed up by the large diameter portion of the operating member and engages the through hole. It is inserted between the groove and the groove. As a result, the connection state of the operating member to the slider is released, and even if the operating member is operated by the operating lever in either the left or right direction beyond the stroke end of the slider, there is no effect on the switching valve etc. connected to the slider. There isn't.

(Embodiment) Reference numeral 1 denotes an operating device, and one end of a hollow case 2 is fixed to a switching valve 3. A hollow slider 4 is slidably inserted into the case 2, and one end (the left end in the figure) is connected to the end of the spool 5 of the switching valve 3 with a stopper pin 6 or the like. Reference numeral 7 designates an operating member, which is configured as a piston consisting of a small diameter portion 8 in the middle and a large diameter portion 9 outside thereof.

Note that a groove 10 is formed in the central inner wall of the case 2, and two through holes 11 are bored in the slider 4 with an interval (the stroke amount of the slider 4) between the grooves 10. There is. The length of the small diameter portion 8 of the piston 7 is set to be the same as the distance between the through holes 11. 12 is inserted between both the through holes 11 and the small diameter portion 8, and is inserted between the slider 4 and the piston 7.
It is a sphere that connects the

Reference numeral 13 denotes an operating lever mounted at a suitable location on the body of the dump truck, etc., and the lever 13 is connected to one end (the right end in the figure) of the piston 7 by a push-pull cable 14 or the like. 15 is the anti-switching valve 3 of case 2
This is a first stopper that is attached to the end and limits the sliding movement of the slider 4 toward the side opposite to the switching valve 3 .
The stopper 15 is also configured as a support member for the tip of the push-pull cable 14. 16 again
is attached to the end of the case 2 on the switching valve 3 side,
A second part that restricts the sliding of the slider 4 toward the switching valve 3 side.
This is the stoppage. If the piston 7 is forced to slide against the slider 4 at the end of the stroke of the slider 4, one of the balls 12 will be pushed up into the large diameter portion 9 and between the through hole 11 and the groove 10. When the piston 7 is inserted into the slider 4, the connection state of the piston 7 to the slider 4 is released.

In the state shown in the figure, the spool 5 is in the neutral position. Then, when the operating lever 13 is rotated clockwise in the figure, the piston 7 moves to the left via the push-pull cable 14. Therefore, slider 4 is also ball 1
2, the spool 5 is also switched and moved to the left. When the slider 4 comes into contact with the stopper 16, the switching valve 3 is switched, and at this time, the right through hole 11 faces the groove 10. Thereafter, when the piston 7 is forced to move further to the left, the ball 12 on the right side is pushed up onto the large diameter portion 9 on the right side and is inserted between the through hole 11 and the groove 10. As a result, the piston 7 is disconnected from the slider 4, and the switching position of the spool 5 is maintained by moving only the piston 7 to the left for the excess stroke of the operating lever 13.

Therefore, the spool 5 responds to the stroke caused by the rotation of the operating lever 13 only by the stroke from the neutral position of the figure until the right ball 12 reaches the groove 10 in the piston 7, and the excess stroke is not operated. The movement stroke is only for the lever 13.

Furthermore, in order to return the spool 5 of the switching valve 3 to the neutral position from the above state, when the operating lever 13 is rotated counterclockwise, the piston 7 begins to move to the right, and the large diameter portion 9 on the right side moves into the through hole on the right side. 11, the ball 12 on the right side moves from inside the groove 10 to the small diameter part 8 side,
Since the slider 4 and case 2 are slidable,
The piston 7 and the slider 4 are integrated and interlocked via the ball 12, so that the spool 5 is switched and moved to the right.

Note that when switching the spool 5 of the switching valve 3 in the opposite direction, the operating lever 13 may be rotated counterclockwise. Then slider 4 will be moved to stopper 15.
The switching valve 3 switches at the position where it contacts the groove 10, and the left through hole 11 faces the groove 10 at this time. The subsequent operation can be explained according to the above operation, so
The explanation will be omitted.

(Effects) As described above, the present invention has one groove 10 on the central inner wall of the case 2 and one groove 10 on the slider 4.
Through-holes 11 are formed at two locations across the two through-holes 11 , and a small-diameter portion 8 having the same length as the interval between both through-holes 11 is formed in the middle part of the operating member (piston) 7 . Inside, a ball 12 is fitted between the through holes 11 and the small diameter portion 8 to connect the slider 4 and the piston 7, and at the stroke end of the slider 4, the piston 7 resists the slider 4. When the forced sliding is executed, one of the balls 12 is pushed up into the large diameter portion 9 and inserted between one of the through holes 11 and the grooves 10, and the piston 7 and the slider 4 are connected to each other. is canceled. Therefore, even if the stroke of the operating lever 13 is larger than the stroke of the switching valve 3, etc. connected to the slider 4, the stroke difference, that is, the excess stroke, is the excess in either the left or right direction. It can be absorbed in 13. Therefore, while the switching of the switching valve 3 etc. is reliable,
No unnecessary external force is applied to the switching valve 3, etc.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of an apparatus according to an embodiment of the present invention. 2... Case, 4... Slider, 7... Operating member (piston), 8... Small diameter part, 9... Large diameter part,
10...groove, 11...through hole, 12...ball, 13...
...Operation lever, 15, 16...stopper.

Claims (1)

[Claims] 1. A hollow case with a groove formed in the central inner wall; a hollow slider that is slidably inserted into the case and has two through-holes spaced apart from each other at positions sandwiching the groove; an operating member which is slidably inserted into the slider and has a small diameter part having the same length as the interval between the through holes in the middle part and a large diameter part outside the small diameter part; stoppers provided at both ends to limit the stroke of the slider; and a ball fitted between both the through holes and the small diameter portion to connect the slider and the operating member; At the end, when the operating member is forced to slide against the slider, one of the balls is inserted between the through hole and the groove, and the operating member is forced to slide against the slider. An operating device designed to release the connection state.