JPS625693Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating lever device for construction machinery, civil engineering machinery, etc., which has an operating lever for work.

The appropriate height of the grip on the operating lever of construction machinery and civil engineering machinery varies depending on the height of the driver, the height of the seat, etc., so the height of the grip can be adjusted according to the height of the driver, etc. Lever devices are known from the prior art. However, with conventional control lever devices, when the height of the grip is adjusted, the operating force and lever stroke of the control lever change depending on the height of the grip, so it is not always possible to obtain the optimal driving posture when performing work. The drawback was that there was no.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an operating lever device that allows the height of the grip to be adjusted without changing the operating force or lever stroke of the operating lever. purpose.

In order to achieve this purpose, the configuration adopted by the present invention includes a first link mechanism rotatable around a pin, a proximal end attached to the first link mechanism, and a grip at the distal end. , an operating lever that can adjust the distance a in the height direction between the pin of the first link mechanism and the grip; a second link lever that extends to
a link mechanism, one end of which is connected to the first link mechanism at a position having a fixed distance b in the lateral direction between the pin and the other end of the link mechanism that is connected to the pin of the link lever constituting the second link mechanism; a displacement transmission rod connected at a position having a lateral distance c between;
an actuating device rod having one end connected to the second link mechanism at a position having a fixed distance d in the height direction between it and the pin, and the other end being connected to the actuating device; The link lever is provided with a connection position adjusting means for adjusting the connection position of the displacement transmission rod in accordance with the distance a in the height direction of the operating lever grip and making the lateral distance c variable.

With this configuration, when the grip position of the operating lever is changed, the distance a in the height direction changes, so at this time, the connection position adjustment means is used to adjust the connection position between the link lever and the displacement transmission rod, and the lateral What is necessary is just to change the direction distance c according to the said height direction distance a. As a result, the lever ratio of the operating lever can be maintained in the same state as before adjusting the grip height, so the stroke of the operating device relative to the stroke of the operating lever is kept constant, and the operating force of the operating lever does not change. .

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, in FIGS. 1 and 2, reference numeral 1 denotes a driver's cab for construction/earthquake machinery such as a hydraulic excavator or a hydraulic crane. is provided. An operating lever 5 having a grip 4 at its tip protrudes from the lever stand 3. The lower end of the operating lever 5 is connected to a first
The lower end of the displacement transmitting rod 7 is attached to a link lever 8, and a second link mechanism 9 including the link lever 8 is connected to the displacement transmitting rod 7 via a link mechanism 6. It is connected to a rod 10 through which the end of the rod 10 is pivotally supported by an operating rod 12 of a switching valve 11.

FIG. 3 shows a state in which the operating lever 5 and the switching valve 11 are connected, and the first link mechanism 6 connects the operating lever 5, the pin 13 provided in the lever stand 3, and the pin 13. The operating lever 5 is fixed to the mounting part 14, which is rotatable as a fulcrum. On the other hand, the displacement transmission rod 7 has a ball joint 15 provided at its upper end.
The distal end of the arm 16 fitted into the arm 16 is fixedly connected to the mounting portion 14, and the displacement transmitting rod 7 is moved up and down in accordance with the rotational movement of the operating lever 5.

Next, the connection between the displacement transmission rod 7 and the link lever 8 is achieved by attaching a ball joint 17 to the lower end of the displacement transmission rod 7.
At the same time, a long groove 8a is bored in the axial direction of the link lever 8 to adjust the connection position of the displacement transmission rod 7, and the bolt 18 is inserted into the long groove 8a. This is done by tightening the tip of the nut 19. Therefore, the movement of the displacement transmission rod 7 is transmitted to the link lever 8.

Since the link lever 8 is rotatably supported by a pin 20 constituting the second link mechanism 9, the link lever 8 rotates about the pin 20 due to the vertical movement of the displacement transmission rod 7. is converted to

The second link mechanism 9 is connected to the link lever 8
The link lever 8, the pin 2
0, there is also a driver's cab 1 to support the pin 20.
The arm 22 is arranged perpendicularly to the link lever 8, is rotatably supported by the pin 20, and rotates with the rotation of the link lever 8. ing. The tip of the arm 22 and the rod 10 are connected by connecting the shaft (not shown) of a ball joint 23 provided at the tip of the rod 10 to the arm 22.
This is done by fixing to 2. On the other hand, the other end of the rod 10 is rotatably supported by a pin 24 on the operating rod 12 of the switching valve 11.

Further, the operation lever 5 is connected to a sheath member 5a and a sheath member 5.
The rod member 5b fitted into the lock nut 2 is shaped like a telescope.
5.

FIGS. 4 and 5 show a state in which the sheath member 5a and the rod member 5b are connected. According to the figure, a stopper 26 having a substantially C-shaped cross section is inserted into the rod member 5b, and a tapered surface 27 is formed at the lower edge of the stopper 26. On the other hand, a tapered surface 28 facing the tapered surface 27 is formed on the upper edge of the sheath member 5a, and the tapered surface 27 of the stopper 26 is connected to the sheath member 5a.
By pressing downward along the tapered surface 28 of the stopper 26, the inner diameter of the stopper 26 is reduced, and frictional engagement is caused between the inner circumferential wall of the stopper 26 and the outer wall of the rod member 5b. The stopper 26 is pressed by screwing the lock nut 25 onto the sheath member 5a, and by screwing the lock nut 25 and displacing it downward, the stopper 26 is pushed between the rod member 5b and the sheath member 5a. Push it into the rod member 5.
Lock b.

The operating lever device of the present invention has the above-mentioned configuration, and FIG. 3 shows a state in which the switching valve is in the neutral position. In this state, the driver presses the control lever 5.
When the grip 4 is rotated to the right in the figure (the position indicated by the dotted line in the figure), the mounting portion 14 that constitutes the first link mechanism 6 rotates around the pin 13, and is displaced accordingly. The transmission rod 7 is displaced downward,
The link lever 8 constituting the second link mechanism 9 rotates around a pin 20. In this case, there are ball joints 1 at the upper and lower ends of the displacement transmission rod 7.
5 and 17, the displacement is transmitted smoothly. In accordance with the rotation of the link lever 8, the arm 22 constituting the second link mechanism 9 also rotates, horizontally moving the rod 10 connected to the arm 22 via the ball joint 23.
The operating rod 12 of the switching valve 11 is moved to the left in the figure (the dotted line position in the figure) to switch the switching valve 11. In this case, the rod 10 moves horizontally and rotates, but since the rod 10 is rotatably attached to the operating rod 12 by the pin 24, no force in the rotational direction acts on the operating rod 12. .

Therefore, for example, when adjusting the position of the grip 4 of the operating lever 5 to the position shown by the two-dot chain line in FIG.
Screw the lock nut 25 to displace the stopper 26 upward, pull out the rod member 5b to a predetermined length position, and screw the lock nut 25 again to move the stopper 26 to the rod member 5.
b and the sheath member 5a, and insert the rod member 5b.
to lock. At the same time, when the bolt 18 connected to the lower end of the displacement transmission rod 7 is moved along the long groove to the position shown by the two-dot chain line, the operating force and lever stroke change even though the height of the grip 4 has changed. does not change.

Next, the principle of this action will be explained.

In FIG. 3, the distance between the pin 13 and the grip 4 is a, and the distance between the pin 13 and the first
The distance from the attachment point to the link mechanism 6 is b, and the bolt 18 at the lower end of the pin 20 and the displacement transmission rod 7 is
The distance from the mounting position of pin 20 to rod 10 is c.
Let d be the distance between the attachment part to the second link mechanism 9 and the attachment part to the second link mechanism 9. The lever ratio i of the operating lever 5 in this case is determined by i=a/b×c/d. Further, the relationship between the stroke 1 of the operating lever 5 and the stroke S of the switching valve 11 is 1=i×S. Therefore, if the distance between the pin 13 and the grip 4 is a' when the height of the grip 4 is adjusted to the height shown by the two-dot chain line, then the bolt 18 at the lower end of the rotation transmission rod 7 is inserted into the long groove. 8a and fixed at a position c' where the lever ratio i' is the same as the lever ratio i when the grip 4 is in its original position, then i=i'=a'/b×c' /d, switching valve 1
The stroke S of 1 is not changed.

Next, the operating force f of the operating lever 5 is determined by f=F/i, where F is the operating force of the switching valve 11. Therefore, even if the position of the grip 4 is changed, the operating force f does not change as long as the lever ratio i remains constant.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, as a means for adjusting the connection position of the displacement transmission rod 7, a long groove is formed in the link lever 8 as in the previous embodiment. 8a, a plurality of mounting holes 8b, 8 are provided in the axial direction of the link lever 8.
It is constructed by drilling b... Therefore, by inserting and fixing the bolt 18 provided at the lower end of the displacement transmitting rod 7 into the appropriate mounting hole 8b according to the adjustment of the height of the grip 4, the same effect as in the previous embodiment can be obtained. can be obtained.

As described above in detail, the operating lever device according to the present invention connects the operating lever to the device actuating rod via the first link mechanism, the displacement transmission rod, the link lever, and the second link mechanism. Since the connection position adjusting means for adjusting the connection position between the displacement transmission rod and the link lever is provided, the connection position between the displacement transmission rod and the link lever can be adjusted in accordance with the height position of the grip of the operation lever. The height position of the grip can be adjusted without changing the operating force of the lever or the stroke of the operating device relative to the lever stroke of the operating lever. Furthermore, since the height position of the grip of the operating lever can be freely changed according to the specifications, it is possible to standardize the product.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing a driver's cab in which a control lever device according to a first embodiment of the present invention is installed;
2 is a front view of FIG. 1, FIG. 3 is a longitudinal sectional view of the operating lever device of FIG. 1, and FIG. 4 is a - of FIG. 3.
FIG. 5 is a sectional view taken in the direction indicated by the - arrow in FIG. 4, and FIG. 6 is an enlarged side view showing the main parts of a second embodiment of the present invention. 4...Grip, 5...Operation lever, 5a...
Sheath member, 5b... Rod member, 6... First link mechanism, 7... Displacement transmission rod, 8... Link lever, 8a... Long groove, 8b... Mounting hole, 9... Second
Link mechanism, 10...Rod, 11...Switching valve, 13...Pin, 14...Mounting part, 18...Bolt, 19...Nut, 20...Pin, 22...
Arm, 25... Locknut, 26... Stoppa.

Claims (1)

[Scope of utility model registration request] a first link mechanism rotatable around a pin; a proximal end side attached to the first link mechanism; and a grip at the distal end; and a height between the pin and the grip of the first link mechanism; an operating lever whose directional distance a can be adjusted; and a control lever rotatably provided below the first link mechanism around a pin;
a second link mechanism having a laterally extending link lever, one end of which is connected to the first link mechanism at a position having a fixed lateral distance b between the pin and the other end of the second link mechanism; a displacement transmitting rod connected at a position having a lateral distance c between the link lever and the pin constituting the link mechanism, and one end fixed in the height direction between the pin and the second link mechanism; an actuating device rod connected to a position having a distance d, and the other end of which is connected to an actuating device; Adjust the connection position of the lateral distance c
An operating lever device provided with a connection position adjustment means that makes the connection position variable.