JPH11184544A - Control lever for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the length of a control lever long or short whenever necessary so that it may match the operation of a construction machine and also that a control lever may not be an obstacle to an operator by configuring a gripping side lever in a freely movable way forwards and backwards to a base side lever. SOLUTION: A hollow part, that has a space and a finished inner surface in which a gripping side lever 6 is inserted in a freely movable way forward and backwards is formed over almost the full length of a base side lever 4. An operator grips a knob of the lever 6 and performs normal control operations of a construction machine. At the time of changing the length of a control lever 2, he presses the projecting part of a tip of knob with the thumb cushion of a gripping hand, controls a lock operating means 9 and releases the engagement of the levers 4 and 6 in a moving direction forwards and backwards. The length of the lever 2 is adjusted by moving the lever 6 in a pulling direction or a pushing direction, and the length of the lever 2 is fixed by a locking means 8 by stopping the pushing of the projecting part after the length is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control lever for a construction machine, and more particularly to a control lever capable of arbitrarily and easily adjusting the length of the control lever.

[0002]

2. Description of the Related Art Construction machines such as hydraulic excavators, bulldozers, wheel loaders, asphalt finishers and the like are provided with control levers for driving and operating the same. The driver
By making full use of the control lever, the construction machine having many functions is controlled so as to fully exert its ability.

[0003] A hydraulic excavator, which is a typical construction machine generally designated by the numeral 30 in FIG. 10, extends a lower traveling body 31 and extends substantially vertically on the lower traveling body 31 (extends vertically in FIG. 10). An upper revolving body 33 is mounted so as to be pivotable about a pivot axis 32. On the upper revolving structure 33, a cab 34 and a working machine 35 arranged in front of the cab 34 (to the left in FIG. 10) are provided. The driver's cab 34 is provided with a driver's seat 34a having a control lever for controlling the work implement 35 and the like.

The work machine 35 includes a boom 37 supported on the upper swing body 33 so as to be vertically swingable, and a boom operating cylinder 3 interposed between the upper swing body 33 and the boom 37.
8, an arm 39 supported at the tip of the boom 37 so as to be swingable in the vertical direction, an arm operating cylinder 40 interposed between the boom 37 and the arm 39, and a swingably supported vertically at the tip of the arm 39. And a bucket operating cylinder 42 interposed between the arm 39 and the bucket 41.

Referring to FIG. 11 together with FIG. 10, a pair of control levers 3 are provided on both left and right sides of a driver's seat 34a.
4b and 34b are provided. Each of the control levers 34b is swingably operated in both front and rear and left and right directions of the driver's seat 34a. One function is steered by the front-rear operation, and the other is steered by the left-right operation. That is, the excavator 3 is controlled by the pair of control levers 34b, 34b.
The four functions of No. 0, the turning operation of the turning motor (not shown) of the upper turning body 33, the expanding and contracting operation of the boom operating cylinder 38, the expanding and contracting operation of the arm operating cylinder 40, and the expanding and contracting operation of the bucket operating cylinder 42 are controlled. Is done. Description of the distribution of these functions to the pair of control levers 34b, 34b is omitted.

By operating the control lever 34b,
A hydraulic direction control valve (not shown) connected to each of hydraulic actuators such as a hydraulic motor and a hydraulic cylinder is operated. Then, the flow direction and the oil amount of the working oil to the hydraulic actuator are controlled, and the operation of the hydraulic actuator is controlled. The operation of the control lever 34b is transmitted to the hydraulic direction control valve by an appropriate means, for example, mechanical means such as a link, hydraulic means by a hydraulic pilot valve, or electric means. The opening of the hydraulic directional control valve that controls the amount of oil supplied to the hydraulic actuator is controlled in accordance with the operation amount (operation stroke) of the control lever 34b. When the control lever 34b is not operated, the oil passage from the hydraulic directional control valve to the hydraulic actuator is closed at the neutral position (the state in FIG. 11).
When the control lever 34b is operated back and forth and left and right to the full operation stroke, the oil passage of the hydraulic directional control valve to the hydraulic actuator is switched to the maximum opening degree, the maximum oil amount is supplied to the hydraulic actuator, and the hydraulic actuator is Operates at maximum speed. On the other hand, the amount of operation of the control lever 34b is adjusted to adjust the opening of the hydraulic direction control valve (throttle).
Then, the oil amount according to the operation stroke is supplied to the hydraulic actuator, and the operating speed of the hydraulic actuator is adjusted.

In a construction machine such as the hydraulic excavator 30, fine adjustment of the opening of the hydraulic directional control valve, that is, fine adjustment of the control lever 34b is performed in order to obtain fine movement of the hydraulic actuator in accordance with various forms of work. Operation required. Therefore, in order to facilitate the fine operation, the maximum operation stroke of the control lever 34d is increased to widen the range in which the adjustment operation can be performed.
As the method, the following two methods are used.
One is a method of increasing the length of the control lever 34b from L1 to L2, as shown in FIG. Another method is to increase the swing angle of the control lever 34b from θ1 to θ2 without changing the length of the control lever 34b, as shown in FIG. That is, by increasing the length of the control lever 34b, as shown in FIG. 8, the maximum operation stroke from the neutral position of the control lever 34b increases from S1 to S2, and the swing angle of the control lever 34b increases. Accordingly, as shown in FIG. 9, the maximum operation stroke from the neutral position of the control lever 34b increases from S1 to S2.

[0008]

The control lever of the conventional construction machine of the above-described type has the following problems to be solved. (1) Increasing the operating stroke by increasing the length of the control lever or increasing the swing angle facilitates fine operation, but requires that the control lever be operated as quickly as possible up to the maximum stroke and repeatedly. In the operation to be performed, for example, the operation of repeatedly excavating earth and sand by a bucket of a hydraulic shovel and discharging the same to other places, if the operation stroke of the control lever is large, the operation amount becomes large, and the operation becomes difficult. In addition, since the amount of movement of the pilot's arm also increases, the pilot gets tired. (2) The long control lever can be easily touched by a driver or the like.
And it becomes an obstacle when operating devices around the control lever, when getting on and off the driver's seat, and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned facts, and has a technical problem in that the length of the control lever is adjusted according to the working mode of the construction machine, and the control lever does not obstruct the driver or the like. Thus, it is an object of the present invention to provide a control lever for a construction machine, which can be adjusted to be long or short and easily adjusted as required.

[0010]

According to the present invention, as a control lever of a construction machine for solving the above technical problem, the control lever includes a base side lever forming a base end side of the control lever, and a base lever. A steering lever for a construction machine, comprising: a grip-side lever inserted into the end lever so as to be able to move forward and backward.

[0011] In the control lever according to the present invention, the grip side lever can freely advance and retreat to the proximal end lever. Therefore,
The length of the control lever can be easily adjusted by inserting or removing the long or short grip side lever.

In a preferred embodiment, the control lever is provided with locking means for locking the grip-side lever to the proximal-side lever at an arbitrary retracted position. Further, the locking means includes a plurality of notches provided on the base side lever, and a movable claw provided on the grip side lever so as to engage and disengage with the notch. Further, locking operation means for operating the locking means is provided on the grip side lever.

Therefore, the grip side lever is fixed to the base side lever at the length adjusted by the locking means.
Also, by the locking operation means provided on the grip side lever,
The locking means is fixed or released.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a control lever of a construction machine constructed in accordance with the present invention will be described below in detail with reference to the accompanying drawings.

Referring to FIG.
The control lever indicated by the symbol is a proximal lever 4 forming the proximal side of the control lever 2, a grip lever 6 provided on the proximal lever 4 so as to be able to advance and retreat, and a gripping portion of the operator's hand. When the side lever 6 is moved to a desired position,
And a locking operation means 9 for operating the locking means 8. The control lever 2 has one end of the base side lever 4 attached to a well-known hydraulic pilot valve 10 by a stud 10a via a well-known mechanism having a rotation center 10b. Thus, the control lever 2 can be operated in the front-back direction (the direction perpendicular to the paper surface in FIG. 1) and the left-right direction (the left-right direction in FIG. 1) around the rotation center 10b. Hydraulic pilot valve 1
Numeral 0 is accommodated in the console 12, and a portion between the console 12 and the proximal end lever 4 of the control lever 2 protruding from the console 12 is covered by a telescopic boot 14. The control lever 2 shown by a solid line in FIG. 1 shows a state in which the grip side lever 6 is contracted to the shortest position.
The two-dot chain line indicates a state where the grip side lever 6 is extended to the longest position.

The proximal lever 4 will be described with reference to FIGS. 2 and 3. The proximal lever 4 is formed in a cylindrical shape from steel or an appropriate material. The base-side lever 4 has a hollow portion 4b having an inner peripheral surface 4a of a dimension and a surface finish into which the grip-side lever 6 (the grip-side lever 6 will be described in detail later) is inserted so as to be able to advance and retreat over substantially the entire length thereof. Is formed. At one end (the lower end in FIG. 2) of the proximal lever 4, a female screw 4 c having a smaller diameter than the inner peripheral surface 4 a is formed. A stud 10a (see FIG. 1) connected to the hydraulic pilot valve 10 is attached to the female screw 4c. On the inner peripheral surface 4a of the hollow portion 4b, a notch 8a having a V-shaped cross section that constitutes the locking means 8 is provided on the inner peripheral surface 4a in the advancing and retreating direction of the grip side lever 6, which is the extending direction of the hollow portion 4b.
7 are formed at regular intervals P and open to the side. A keyway 4e is formed on the inner peripheral surface 4a of the hollow portion 4b where the notch 8b is provided, on the opposite side in the diameter direction, over the entire length of the grip side lever 6 in the reciprocating direction. A washer plate 4f having a through hole through which the grip lever 6 passes is attached to the other end (the upper end in FIG. 2) of the proximal end lever 4.

The grip-side lever 6 will be described with reference to FIG. 4 together with FIGS. 2 and 3. The grip-side lever 6 is configured such that one end (a lower end in FIG. 2) of the base-side lever 4 can move forward and backward. It has a hollow grip-side lever body 6a to be inserted, and a knob 6b, which is a part gripped by the operator, which is put on the other end (the upper end in FIG. 4) of the lever body 6a. The lever body 6a is formed in a hollow pipe shape from steel or an appropriate material. The end on the side of the proximal side lever 4 forms a closed end 6b which is closed. Closed end 6
The outer diameter 6b of the outer peripheral surface 6b and the surface finish are manufactured so as to freely engage with the inner peripheral surface 4a of the hollow portion 4b of the proximal lever 4. The end on the knob 6b side is open, and the outer peripheral portion has a large-diameter portion 6e having a diameter larger than the outer peripheral surface 6c.
Are formed. The hollow pipe-shaped inner peripheral surface 6d of the lever body 6a is finished so that the locking means 8 and the locking operation means 9 are slidably inserted. On the outer peripheral surface 6c of the closed end 6b, a claw hole 6f penetrating the inner peripheral surface 6d is provided. A key mounting groove 6g is formed on the outer peripheral surface 6c side of the closed end 6b on the side opposite to the diameter direction of the claw hole 6f.

The knob 6b is made of a flexible synthetic resin or synthetic rubber, and is formed in a cylindrical bag shape whose bottom is inflated substantially spherically. The knob 6b is dimensioned to be extended and attached to the large diameter portion 6e and the outer peripheral surface 6c of the grip side lever 6. The substantially spherical bottom is provided with a projection 6h constituting the locking operation means 9. The rod member 7 of the locking operation means 9 described later comes into contact with the projection 6h.

Referring to FIG. 5 together with FIGS. 2 to 4, the locking means 8 and the locking operation means 9 will be described.

The locking means 8 is provided on the grip-side lever 6 such that the plurality of notches 8a provided on the proximal lever 4 and the notches 8a can be engaged and disengaged through the claw holes 6f. And a claw 8b. The movable claw 8b is formed by forging steel or punching a thick steel plate.
At one end of the movable claw 8b, a claw projection that engages with the notch 8a is formed. A pin hole is formed at the other end. The movable claw 8b is attached to the rod member 7 constituting the locking operation means 9 by this pin hole.

The locking operation means 9 includes a protrusion 6h provided on the knob 6b and a rod member 7 inserted into the grip side lever 6. The rod member 7 is provided in the grip side lever 6 with a length substantially equal to the entire length of the grip side lever 6. The rod member 7 is made of steel or a suitable material, and is basically formed to have a small diameter that does not interfere with the inner peripheral surface 6d of the grip-side lever 6, and has a closed end 6b and an open-end large-diameter portion 6e of the grip-side lever 6. The large diameter portion 7 sliding on the inner peripheral surface 6d
a and a large diameter portion 7d are formed respectively. Closed end 6b
A slit 7b is formed in the large-diameter portion 7a on the side in a longitudinal direction thereof so as to allow the thickness of the movable claw 8b to freely enter. The forked large diameter portion 7a on both sides of the slit 7b is provided with a pin hole 7e perpendicular to the slit 7b and penetrating the forked portion of the large diameter portion 7a. The movable claw 8b is rotatably attached to the pin 7c passed through the pin hole 7e in the slit 7b.

The assembly and operation of the control lever 2 will be described with reference to FIGS. First, the grip side lever 6
The compression spring 18 and the washer 16 are sequentially inserted into the closed end 6b of the lever body 6a. The rod member 7 to which the movable claw 8b is attached is inserted from the open end of the lever body 6a,
The claw projection of the movable claw 8b is positioned in the claw hole 6f of the lever body 6a while compressing the compression spring 18 via the washer 16. Attach the knob 6b to the open end of the lever body 6a. In this state, the protrusion 6h of the knob 6b is in contact with the large diameter portion 7d of the rod member 7 (see FIG. 4).
The key 20 is attached to the key groove 6g of the lever body 6a of the grip side lever 6. The grip side lever 6 is inserted into the proximal side lever 4 while aligning the key 20 with the key groove 4e. Thus, the grip side lever 6 is attached to the base side lever 4 so as to be able to advance and retreat, that is, can be freely inserted and removed.
And the keyway 4e, the base side lever 4 and the grip side lever 6
The movement in the rotation direction with is restricted. Attach the washer plate 4f to the end of the proximal side lever 4. When the grip-side lever 6 is moved in a direction to pull out from the base-side lever 4, the gripper-side lever 6 comes out of the washer plate 4.
This is prevented by contact of the key 20 with f. In addition,
Lubricating oil is applied to the sliding portion between the proximal end lever 4 and the grip side lever 6, or an oil-impregnated bearing is used.

FIG. 6 shows that the rod member 7 is pushed by pushing the projection 6h at the tip of the knob 6b, which is the locking operation means 9, and the claw projection of the movable claw 8b is positioned in the claw hole 6f of the lever body 6a.
To the state shown in. In this state, the movable claw 8b of the locking means 8 does not engage with the notch 8a. In this state, the grip-side lever 6 is inserted into and pulled out of the base-side lever 4, and the extendable position of the grip-side lever 6 is adjusted by a plurality of notches provided in the movable claw 8b and the advance / retreat direction of the grip-side lever 6. 8a. When the pressing of the protrusion 6h at the tip of the knob 6b is stopped and the compression of the compression spring 18 is released, the movable claw 8
The handle lever 6 is locked to the proximal lever 4 by engaging the notch 8a with the selected notch 8a.

The engagement between the notch 8a and the movable claw 8b is released by pressing the protrusion 6h of the knob 6b to compress the compression spring 18 via the washer 16 as described above, and to release the lever body 6a.
The claw projection of the movable claw 8b is pulled into the claw hole 6f of the movable claw 8b.
b is released from the notch 8a.

The operation of the control lever 2 as described above will be described with reference to FIGS.

(1) The operator operates the knob 6 of the grip side lever 6
Hold b to perform normal operation of the construction machine. When the length of the control lever 2 is changed, the protrusion 6h at the tip of the knob 6b is pushed with the grip of the thumb, for example, to operate the locking operation means 9 to move the base lever 4 and the grip lever 6 forward and backward. Release the engagement in the direction, and move the grip side lever 6 in the pulling direction or the pushing direction to adjust the length of the control lever 2,
When the length is adjusted, the pushing of the protrusion 6h is stopped, and the length of the control lever 2 is fixed by the locking means 8.

(2) When the grip-side lever 6 is fully pushed (the state of FIG. 2), the control lever 2 is contracted to the shortest state (the state of FIG. 1), and the control lever 2 suitable for quick repetitive operation is provided. Is done. On the other hand, when the grip side lever 6 is fully pulled out (the state shown in FIG. 7), the control lever 2 is extended to the longest state (the state shown by the two-dot chain line in FIG. 1), and the control lever 2 suitable for fine operation is provided. Is done.

(3) The locking means 8 has a plurality of notches 8a.
Is provided in the direction in which the grip side lever 6 moves forward and backward, so that the length of the control lever 2 is changed by a notch 8 between the longest and the shortest.
By selecting a, it can be adjusted arbitrarily.

(4) The extension and retraction of the control lever 2 can be easily performed to a required length by operating the locking operation means 9 when necessary. Further, it can be performed while holding the knob 6b. And a tool is not required for the extension / contraction operation.

(5) When operating the devices around the control lever 2 with the control lever 2 extended for a long time, or when the control lever 2 gets in the way when getting on or off the driver's seat, The control lever 2 can be shortened so as not to be in the way.

(6) Since the grip side lever 6 is configured to extend and retract with respect to the base side lever 4, when the boot 14 is provided between the base side lever 4 and the console 12, the grip side It is not affected by the lever 6. Therefore, the boot 14 can be easily designed and attached.

(7) Since the locking means 8 of the control lever 2 has the notch 8a and the movable claw 8b, the hydraulic excavator 30
The control lever 2 is reliably held at the expanded and contracted position against the vibration impact of the construction machine.

As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be variously modified or modified within the scope of the present invention. It is. For example, (1) In the embodiment of the present invention, the proximal lever 4
A locking means 8 and a locking operating means 9 are provided between the gripping lever 6 and the gripping lever 6 which can move forward and backward, but the locking means 8 and the locking operating means 9 are not provided, and the proximal lever 4 is not provided. A suitable frictional resistance may be applied to the sliding portion between the grip lever 6 and the grip lever 6 so that the proximal lever 4 and the grip lever are held by the resistance. Also, the notch 8a of the locking means 8 and the movable claw 8b may be engaged and disengaged by the pulling and inserting operation of the grip side lever 6 without the locking operation means 9 and only the locking means 8. Good. (2) In the embodiment of the present invention, seven notches 8a of the locking means 8 are provided at equal intervals, but it goes without saying that the number, interval, shape, and the like of the notches can be appropriately determined. No. (3) The notch 8a of the locking means 8 is omitted, and the movable claw 8b
May be directly pressed against the inner peripheral surface 4a of the proximal lever 4 and locked by the frictional force.

[0034]

According to the control lever of the construction machine constructed in accordance with the present invention, the length of the control lever is adjusted according to the form of work of the construction machine, and the control lever is not obstructed by the operator or the like. , Longer or shorter, as needed
Also provided is a control lever for a construction machine, which can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a control lever of a construction machine configured according to the present invention, the view being attached to a hydraulic pilot valve.

FIG. 2 is an enlarged cross-sectional view of a portion of a proximal lever of the control lever shown in FIG. 1;

FIG. 3 is a sectional view of FIG. 2 as viewed in the direction of arrows AA.

FIG. 4 is an enlarged sectional view of a grip portion of a grip side lever of the control lever shown in FIG. 1;

FIG. 5 is a sectional view of FIG. 2 as viewed in the direction of arrows BB.

FIG. 6 is an enlarged cross-sectional view of a portion of a proximal lever showing a state where a movable claw of a locking means is released from a notch;

FIG. 7 is an enlarged cross-sectional view of a portion of a proximal lever showing a state where a control lever is fully extended.

FIG. 8 is an explanatory diagram showing a relationship between a lever length of a control lever and an operation stroke.

FIG. 9 is an explanatory diagram showing a relationship between an operation angle of a control lever and an operation stroke.

FIG. 10 is a side view of a hydraulic excavator that is a typical example of a construction machine.

FIG. 11 is a perspective view of a driver seat provided with a control lever.

[Explanation of symbols]

 2: control lever 4: base end lever 6: grip side lever 8: locking means 8a: notch 8b: movable claw 9: locking operating means

Claims (4)

[Claims] 1. A manual control lever for a construction machine, wherein the control lever includes a base lever forming a base end of the control lever, and a grip lever inserted into the base lever so as to be able to advance and retreat. And a control lever for a construction machine. 2. The control lever of a construction machine according to claim 1, wherein the control lever includes a locking means for locking the grip side lever to the base side lever at an arbitrary retreat position. 3. The locking means comprises a plurality of notches provided on the base side lever, and a movable claw provided on the grip side lever so as to engage and disengage from the notch. A control lever for a construction machine according to claim 2. 4. A locking operation means for operating the locking means,
The control lever of a construction machine according to claim 2, wherein the control lever is provided on the grip side lever.