JPH07331704A - Operation system lock device - Google Patents

Abstract

PURPOSE:To provide an operation system lock device capable of being positioned in a lock operation position even if it is rotated around a vertical shaft by providing an operation system lock lever fixed to a horizontal shaft, a third link member fixed to a vertical shaft, and a second over center compression spring mechanism. CONSTITUTION:When an operation system lock lever 26 is on a lock operation released position, by applying one side horizontal force on the lever 26, the lever 26 together with a horizontal shaft 24 and a supporting bracket 16 are rotated around a vertical shaft 14. Next when a third link member 62 is rotated by the rotation of the shaft 14 and one extreme end of the link exceeds a straight line L passing through respective axes of a first fixed shaft 72 the shaft 14, and a second fixed shaft 76, the direction of rotational energizing force of a first compression spring 74 on the link member 62 coincides with the direction of rotational energizing force of a second compression spring 78 on the link member 62. Next the lever 26 is rotated in the same direction by the energizing force of the springs 74, 78, and positioned in a first lock operation position as a prescribed rotational position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device applied to an operating system such as an operating lever or an operating pedal in a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art A typical example of the locking device is, for example, Japanese Utility Model Publication No. 62-12664 or Japanese Utility Model Publication No.
The device disclosed in JP-A-37006 can be mentioned. These devices include an operation system lock lever rotatably supported by a support frame provided in the cab of a construction machine such as a hydraulic excavator, and an operation system lock means provided at the end of the operation system lock lever. An actuator to be operated, or a push-pull cable having one end connected to the operation system lock lever and the other end connected to the operation system lock means. As a locking means for the operation system, a mechanism for fixing a pilot line relief valve or a reach rod for control valve switching control is disclosed. The operation system lock lever is selectively positioned at a lock operation release position extending toward the front of the driver's seat and a lock operation position extending toward the rear of the driver's seat. The two positions of the operation system lock lever are achieved by rotating the operation system lock lever around the horizontal axis.

When the operation system lock lever is positioned at the lock release position extending toward the front of the driver's seat,
The locking means of the operating system is deactivated via the actuator or the push-pull cable. As a result, the control valve that controls the operation of each actuator in the front (working machine) including, for example, the boom, the arm, and the bucket is in a state in which it can be operated at any time, and the operator operates the operation lever to perform the necessary work. Be done. On the other hand, when the operator leaves the driver's seat, the operation system lock lever is rotated to the lock operation position extending toward the rear of the driver's seat. As a result, the control valve is locked so that it cannot operate and a safe state is secured.

[0004]

SUMMARY OF THE INVENTION In the above device,
The lock operation release position of the operation system lock lever is a position where the operation system lock lever extends toward the front of the driver's seat. This makes the operator notice that the operation system lock lever is located at the lock release position, and aims to get off the driver's seat after the operator positions the operation system lock lever at the lock operation position. I have. However, there is a possibility that the operator may intentionally or completely inadvertently position the operation system lock lever at the lock operation position.

Therefore, an object of the present invention is to position the operation system lock lever in the lock release position at the lock operation position not only when it is rotated about the horizontal axis but also when it is rotated about the vertical axis. Therefore, it is an object of the present invention to provide an operation system locking device which is capable of improving the safety.

[0006]

In order to achieve the above object, according to the present invention, an operating system lock lever rotatably supported on a horizontal shaft and one end operatively connected to the operating system lock lever. And a push-pull cable whose other end is connected to a locking means of the operation system, the operation system lock lever extending toward the front of the driver's seat and the lock release position extending toward the rear of the driver's seat. In an operation system lock device selectively positioned at a lock operating position extending in a vertical direction, a support bracket fixed to a vertical shaft rotatably provided on a support frame, and a support bracket rotatably provided on the support bracket. A horizontal shaft, the operation system lock lever having one end fixed to the horizontal shaft, the first link member and the second link member, and the other end of the first link member and the frame. A first over-center compression spring mechanism, the push-pull cable whose one end is connected to the other end of the second link member, a third link member whose end is fixed to the vertical shaft, and the third link Acts on a member to position the operation system lock lever at the lock operation release position, a first lock operation position which is rotated from the lock operation release position to one side around the vertical axis, and a second lock operation position which is rotated to the other side. A second over-center compression spring mechanism, wherein the first link member is positioned to incline substantially rearward when the operating system lock lever is in the lock release position, and the second link member is Positioned to extend substantially horizontally toward the rear, the first overcenter compression spring mechanism has one end connected to the other end of the first link member via a first spherical joint means. One member, one end of which is connected to the frame through a second spherical joint means and the other end of which is engaged with the other end of the first member so as to be able to expand and contract in the axial direction between the first member and the member. There is provided an operation system lock device comprising a second member, a compression spring for urging the first member and the second member in an extension direction.

[0007]

In the operation system lock device improved by the present invention, when the operation system lock lever is in the lock release position, the operation system lock lever is positioned so as to extend toward the front of the driver's seat. In this state, the lock means of the operation system connected to the push-pull cable, for example, the pilot line relief valve is positioned in the inoperative position. Since the pilot pressure oil from the pilot pump is normally supplied to the remote control valve,
The operator can freely perform the required work by operating the operation lever or the operation pedal. In this state, when one horizontal force is applied to the operation system lock lever, the operation system lock lever is rotated around the vertical axis together with the horizontal axis and the support bracket. When the third link member is rotated by the rotation of the vertical shaft and one end of the link crosses a common straight line passing through the respective axes of the first fixed shaft, the vertical shaft and the second fixed shaft, the first compression spring The direction of the rotational biasing force applied to the third link member is the second
It coincides with the direction of the rotational biasing force applied to the third link member of the compression spring. As a result, the operation system lock lever is rotated in the same direction by the urging forces of the first compression spring and the second compression spring, and is positioned at the first lock operation position which is the predetermined rotation position. Note that it is necessary to provide the device with stopper means for preventing the rotation of the third link member in the same direction. As a result, the third link member is moved to the predetermined rotation position (first lock operation position of the operation system lock lever) where the operation system lock lever is rotated a predetermined angle from the lock operation release position and the rotation is restricted by the stopper means. It is held by the biasing forces of the first compression spring and the second compression spring.

Due to the rotation of the horizontal axis about the vertical axis, the first
The link member and the second link member are also rotated together with the horizontal axis in one rotation direction to a predetermined angle (the operation system lock lever is positioned at the first lock operation position). The push-pull cable is pulled by a predetermined length by rotating the second link member to a predetermined angle. As a result, the locking means of the operating system, for example the pilot line relief valve, is shifted to the operating position. The pressure oil from the pilot pump is relieved to the oil tank, and the pilot secondary pressure is not supplied to the control valve even if the remote control valve is opened, so the machine does not operate even if the operator operates the operation lever or operation pedal. It becomes a state.

The rotation of the first link member about the vertical axis also causes the first overcenter compression spring mechanism to rotate in the horizontal direction. This movement is caused by the operation of the first and second spherical joint means and the first and second spherical joint means. It is easily absorbed by the expansion and contraction operation between the two members. When another horizontal force is applied to the operation system lock lever in the first lock operation position, the operation system lock lever is rotated around the vertical axis in the opposite direction to the above and is returned to the lock operation release position. Even when another horizontal force is applied to the operation system lock lever positioned at the lock release position, the operation system lock lever is rotated in the other direction around the vertical axis, and the second overcenter compression spring mechanism is operated. Is positioned in the second lock operating position. Even in this case, it is necessary to provide the stopper means for preventing the rotation of the third link member in the opposite direction.

Since the operation system lock lever located at the lock release position is located at a position that prevents the operator from getting in and out, if the operator tries to get out of the driver's seat in this state, the operation system lock lever is operated. The system lock lever is located at the position most easily touched by the operator. Therefore, it can be said that the system lock lever is easily susceptible to the horizontal force due to the movement of the operator before the operation lever or the operation pedal is erroneously operated. Therefore, it can be said that the fact that the operation system lock lever rotates about the vertical axis by the force in the horizontal direction and is positioned from the lock operation release position to the lock operation position significantly improves safety. In addition, as described above, the operation system lock lever can be positioned in the lock operating position by rotating it in any horizontal direction around the vertical axis, so that in an emergency, the operator can easily operate the operation system lock lever in a quick and easy manner. Since it can be positioned at the lock release position, the safety is also improved in this respect.

On the other hand, when the operator leaves the driver's seat, if the operation system lock lever is rotated around the horizontal axis toward the rear of the driver's seat as normal, the first link member and the second link member are moved horizontally. It is rotated downward with. Until the first link member becomes substantially horizontal, the reducing action is performed between the first member and the second member of the first over-center compression spring mechanism, and the compression spring is compressed. When the first link member rotates below the substantially horizontal position, an extension action is performed between the first member and the second member of the first over-center compression spring mechanism, and the direction of the biasing force of the compression spring is the first link member. Can be switched to a direction that promotes rotation. As a result, the operation system lock lever is positioned at the lock operating position. The first link member (or the second link member,
It is necessary to provide a stopper means for preventing the horizontal shaft or the operation system lock lever) from rotating in the same direction. As a result, the first link member is rotated by a predetermined angle from the initial position where the operation system lock lever is aligned with the lock operation release position, and the rotation is restricted by the stopper means (the operation system lock lever lock operation position). ) Is held by the biasing force of the compression spring of the first overcenter compression spring mechanism. The second link member is also rotated together with the horizontal axis in one rotation direction by a predetermined angle. The push-pull cable is pulled by a predetermined length by rotating the second link member to a predetermined angle. As mentioned above, since the pilot line relief valve is shifted to the operating position,
The machine will not operate even if the operator operates the operation lever or operation pedal. When the operation system lock lever in the first lock operation position is rotated in the opposite direction about the horizontal axis, the operation system lock lever is returned to the lock operation release position. Even in this state, since the rotation biasing force of the compression spring of the first over-center compression spring mechanism acts on the operation system lock lever, the first link member (or the second link member, the horizontal shaft, or the operation system lock lever) is actuated as described above. It is necessary to provide stopper means for preventing rotation of the lever) in the opposite direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a lock device for an operating system constructed according to the present invention will be described in detail below with reference to the accompanying drawings. Referring to FIG. 1, a support base 3 is provided on a deck plate 1 of an operator's cab of a hydraulic excavator (not shown), and an operation lever 5 is provided on the support base 3. A driver's seat (not shown) is provided on the back side of the support base 4. The front of the driver's seat is the left side of FIG. 1, and the rear of the driver's seat is the right side of FIG. The operation system locking device indicated by reference numeral 2 is arranged on the front side (front side) of FIG. The door (not shown) of the driver's cab is located further to the front side of the operation system lock device 2.

Referring to FIGS. 1 to 4, the deck plate 1
A pair of webs 4 extending upward with a space in the front-back direction of FIG. Each web 4 is composed of a rectangular plate member having substantially the same shape, and a rectangular plate 6 is fixed to the upper end portion thereof. A support plate 8 extending upward is fixed on the front end portion of the plate 6, and a plate 1 extending horizontally rearward is provided on the upper end thereof.
One end of 0 is fixed. The plate 10 has a triangular shape when viewed from a plane as shown in FIG. these,
The pair of webs 4, the plate 6, the support plate 8 and the plate 10 constitute a support frame 12. A vertical shaft 14 is rotatably supported between the plate 10 and the plate 6 so as to penetrate therethrough. A support bracket 16 is fixed to the vertical shaft 14 so as to rotate integrally therewith. The support bracket 16 includes a base portion 18 fixed to the vertical shaft 14, and a pair of support portions 20 extending in parallel rearward from both end portions of the base portion 18. A plurality of disc springs 22 that restrict the free rotation of the support bracket 16 are arranged between the lower surface of the base portion 18 of the support bracket 16 and the upper surface of the plate 6.

A horizontal shaft 24 is rotatably supported between the pair of support portions 20 of the support bracket 16. Horizontal axis 2
One end of 4 protrudes from the supporting portion 20 located on the front side in FIG. 1, and one end (lower end) of the operation system lock lever 26 is fixed to this protruding portion. A pair of support parts 2 of the horizontal shaft 24
At the position between 0, one end of each of the first link member 28 and the second link member 30 is fixed. As shown in FIG. 1, the operation system lock lever 26 extends toward the front of the driver's seat. Operation system lock lever 26
This position defines the lock release position of the operation system lock lever 26. When the operation system lock lever 26 is in the lock release position, the first link member 28 is positioned so as to incline substantially rearward and upward.
The link member 30 is positioned so as to extend substantially horizontally toward the rear. A frame 32 is fixed upright on the deck plate 1 at the rear position of the support frame 12. The frame 32 is composed of a substantially rectangular plate member. The other end of the first link member 28 and the frame 3
A first over-center compression spring mechanism 34 is provided between the two.

The first over-center compression spring mechanism 34 has one end connected to the other end (tip) of the first link member 28 via a first spherical joint means 36, and a rod member 38 which is one end. A guide cylinder that is a second member that is connected to the frame 32 via the second spherical joint means 40 and has the other end engaged with the other end of the rod member 38 so as to expand and contract in the axial direction with the rod member 38. 42 and rod member 3
8 and a compression spring 44 that biases the guide cylinder 42 in the extension direction. The other end of the rod member 38 is slidably inserted into the guide cylinder 42. The first spherical joint means 36, which is an all-shaft joint means, includes the first link member 2
The rod end 48 is fixed to the other end of the rod 8 and has a sphere 46 at one end, and a spherical receiving portion (not shown) provided at one end of the rod member 38. The second spherical joint means 40, which is an all-shaft joint means, comprises a rod end 52 fixed to the frame 32 and having a sphere 50 at one end, and a spherical receiving portion (not shown) provided at one end of the guide cylinder 42. There is. The compression spring 44 is used for the guide cylinder 4
The outer diameter of the rod member 38 is large and the outer diameter of the rod member 38 is small. Although not shown in the drawing, a retainer for receiving one end of the compression spring 44 is provided on the other end side (left end side in FIG. 2) of the rod member 38, and one end side (right end side in FIG. 2) of the guide cylinder 42 is provided. A retainer for receiving the other end of the compression spring 44 is provided. With this configuration, the rod member 38 is urged by the compression spring 44 in the axial direction of the guide cylinder 42. Therefore, in the state shown in FIGS. 1 and 3, a counterclockwise rotational force is applied to the operation system lock lever 26 with respect to the horizontal shaft 24. For this reason, the operation system lock device 2 may be provided with stopper means for preventing the first link member 28, the second link member 30, the horizontal shaft 24, or the operation system lock lever 26 from rotating in the same direction. is necessary. For example, it is conceivable to provide the support bracket 16 with a stopper (not shown) that prevents the first link member 28 from rotating in the same direction. When the first link member 28 is pressed against the stopper by the rotational biasing force of the compression spring 44, the lock operation release position of the operation system lock lever 26 is held.

On the lower surface of the deck plate 1 at the lower position of the frame 32, a pilot line relief valve 54 which constitutes a locking means of the operation system is mounted.
Although not shown, the hydraulic excavator to which the present invention is applied is provided with a hydraulic circuit of an operating system. This hydraulic circuit is configured so that pilot pressure oil from a pilot pump is supplied to a control valve via a remote control valve operated by an operation lever. The pilot line relief valve 54 is arranged in an oil passage between the pilot pump and the remote control valve, and the oil passage is connected to the oil tank via the pilot line relief valve 54. The guide stopper 5 is provided above the frame 32.
6, a pipe-shaped cable guide 58 has one end held by the guide stopper 56 and the other end held by the pilot line relief valve 54. A push-pull cable 60 is movably inserted along the cable guide 58. One end of the push-pull cable 60 is connected to the other end of the second link member 30, and the other end is connected to a spool (not shown) of the pilot line relief valve 54. The push-pull cable 60 is positioned so as to extend substantially horizontally between the other end of the second link member 30 and one end of the cable guide 58. Therefore, as shown in FIGS. 1 and 3, the axial center of the horizontal shaft 24, the center of the second link member 30 in the longitudinal direction, and the push-pull cable 60 are at least the horizontal shaft 24 and the one end of the cable guide 58. They are located on a common horizon. The axis of the second spherical joint means 40 of the first over-center compression spring mechanism 34, that is, the axis of the sphere 50 is also positioned on the horizontal line.

As shown in the figure, the pilot line relief valve 54 closes the oil passage to the oil tank and the pilot pressure oil from the pilot pump when the operation system lock lever 26 is positioned at the lock release position. Is configured to be normally supplied to the remote control valve. Therefore, if the remote control valve is operated by the operation lever, the pilot secondary pressure acts on the control valve, and the operation system operates normally. On the other hand, when the push-pull cable 60 is pulled to the left by a predetermined length in FIGS. 1 and 3, the spool of the pilot line relief valve 54 is shifted to the left, and the pilot line relief valve 54 causes the oil passage to the oil tank. open. As a result, the pilot pressure oil from the pilot pump is relieved in the oil tank upstream of the remote control valve, so even if the remote control valve is operated by the operating lever, the pilot secondary pressure does not act on the control valve. Is locked. Therefore, when the operation system lock lever 26 is rotated around the horizontal axis 24 and positioned from the lock operation release position shown by the solid line in FIG. 1 to the lock operation position shown by the two-dot chain line, the second link member 30 of FIG. The lock operation release position shown by the solid line is located at the lock operation position shown by the two-dot chain line. Since the push-pull cable 60 is pulled for a predetermined length, the operation system is locked.

In the rotational operation of the operation system lock lever 26 from the lock operation release position to the lock operation position, when the first link member 28 is in a horizontal state, that is, the center in the longitudinal direction is on the horizontal line. When positioned, the rod member 38 and the guide cylinder 42 of the first over-center compression spring mechanism 34 are contracted by the maximum amount, and when the rod member 38 and the guide cylinder 42 are rotated downward beyond the horizontal line, they are expanded again by the biasing force of the compression spring 44. . Then, the direction of the rotational urging force of the compression spring 44 acting on the first link member 28, and thus the operation system lock lever 26, is opposite to the horizontal line as a boundary. In the lock operation state shown by the chain double-dashed line in FIG. 1, a clockwise rotational urging force is applied to the operation system lock lever 26 with respect to the horizontal shaft 24. For this reason, the operation system lock device 2 may be provided with stopper means for preventing the first link member 28, the second link member 30, the horizontal shaft 24, or the operation system lock lever 26 from rotating in the same direction. is necessary. For example, in the support bracket 16,
It is conceivable to provide a stopper (not shown) that prevents the first link member 28 from rotating in the same direction. The first link member 28 is pressed against the stopper by the rotational biasing force of the compression spring 44, so that the lock operating position of the operation system lock lever 26 is held.

The lower end of the vertical shaft 14 penetrates the plate 6 and projects downward. The end of the third link member 62 is fixed to this protruding portion of the vertical shaft 14.
The number 70 acts on the third link member 62 to move the operation system lock lever 26 to the lock operation release position, the first lock operation position which is rotated from the lock operation release position to the one side around the vertical axis, and the other which is rotated to the other side. 2 shows a second over-center compression spring mechanism positioned in the two-lock actuated position.

The second over-center compression spring mechanism 70, as shown in FIG. 4, includes two links 62a and 62b of substantially the same shape, each extending radially from the vertical axis 14 at an angle smaller than 180 degrees. 3 link member 62, the 1st compression spring 74 which one end was connected with the tip of link 62a, and the other end was connected with the 1st fixed shaft 72, and one end was connected with the tip of link 62b and the other end was the 2nd fixed shaft. 76
And a second compression spring 78 connected to the. The third link member 62 is integrally formed by the links 62a and 62b. The first fixed shaft 72 and the second fixed shaft 76 are
Each of them is fixed upright on the deck plate 1 and arranged at a target position in the front-rear direction with respect to the vertical shaft 14. The respective axes of the first fixed shaft 72, the vertical shaft 14, and the second fixed shaft 76 are positioned on a substantially common straight line L (see FIG. 4). The first compression spring 74 has a link 6 at one end thereof.
2a is connected by being wound around a pin attached to the tip of the 2a, the other end is connected by being wound around the first fixed shaft 72, and is so-called scissor-shaped, which is wound at least in a single portion at the center thereof. It is composed of springs. The second compression spring 78 has one end connected to it by being wound around a pin attached to the tip of the link 62b, and the other end connected to being wound on the second fixed shaft 76, and at least at the center thereof. It is composed of a so-called scissor-shaped spring that is wound in a single layer. First
Each of the compression spring 74 and the second compression spring 78 is substantially composed of common parts.

When the operation system lock lever 26 is in the lock release position (the state shown by the solid line in FIGS. 1 to 4), the tips of the links 62a and 62b are on one side of the straight line L (see FIG. 4). (The lower side), the directions of the rotational biasing forces applied to the third link member 62 by the first and second compression springs 74 and 78 are substantially opposite, and the magnitudes of the rotational biasing forces are substantially the same. Is specified. That is, in the state of FIG. 4, the biasing force of the first compression spring 74 acts to rotate the vertical shaft 14 counterclockwise via the link 62a, and the biasing force of the second compression spring 78 acts via the link 62b. It acts to rotate the vertical shaft 14 in the clockwise direction, and the magnitudes of the biasing forces are substantially the same.
Therefore, the position of the third link member 62 in the rotation direction is
The state of FIG. 4 is maintained by the balance of the urging forces of the first and second compression springs 74 and 78, and the operation system lock lever 2
6 is held in the lock release position.

When a force is applied to the operation system lock lever 26 in a horizontal direction, for example, from the top to the bottom of FIG. 2, the operation system lock lever 26 moves around the vertical shaft 14 together with the horizontal shaft 24 and the support bracket 16. Counterclockwise (Fig. 4
Clockwise). When the vertical shaft 14 rotates, the third link member 62 rotates clockwise in FIG. 4, and when the tip of the link 62a crosses the straight line L and rotates upward in FIG. 4, the third link member 62 of the first compression spring 74 is rotated. The direction of the rotational urging force applied to is changed from counterclockwise to clockwise,
Therefore, it coincides with the direction (clockwise direction) of the rotational biasing force applied to the third link member 62 of the second compression spring 78. The third link member 62 receives the rotational biasing force of both the first compression spring 74 and the second compression spring 78 and rotates. as a result,
The operation system lock lever 26 is positioned at a first lock operation position (not shown) which is a predetermined rotation position. Note that it is necessary to provide the device with stopper means for preventing the third link member 62 from rotating in the same direction. For example, it is conceivable to provide the plate 6 with a stopper (not shown) that prevents the link 62a from rotating. As a result, the third link member 62 has a predetermined rotation position (first lock operation position of the operation system lock lever 26) in which the operation system lock lever 26 rotates from the lock operation release position by a predetermined angle and the rotation is restricted by the stopper. Further, it is held by the biasing force of the first compression spring 74 and the second compression spring 78.

By the rotation of the operation system lock lever 26 around the vertical shaft 14, the horizontal shaft 24 is also rotated around the vertical shaft 14 in the same direction (counterclockwise direction in FIG. 2). As a result, the first link member 28 and the second link member 30 are also rotated together with the horizontal shaft 24 in the same direction up to a predetermined angle (until the operation system lock lever 26 is positioned at the first lock operation position). The push-pull cable 60 is pulled by a predetermined length by rotating the second link member 30 to a predetermined angle. As a result, the pilot line relief valve 54 is shifted to the operating position. The pressure oil from the pilot pump is relieved to the oil tank, and the pilot secondary pressure is not supplied to the control valve even if the remote control valve is opened, so the machine does not operate even if the operator operates the operation lever or operation pedal. It becomes a state. The rotation of the first link member 28 about the vertical axis 14 also rotates the first over-center compression spring mechanism 34 in the horizontal direction. This movement is caused by the operation of the first and second spherical joint means 36 and 40, and the rod The expansion / contraction operation between the member 38 and the guide cylinder 42 allows the absorption without difficulty.

When a reverse horizontal force (clockwise in FIG. 2) acts on the operation system lock lever 26 in the first lock operation position, the operation system lock lever 26 moves around the vertical shaft 14 in the clockwise direction in FIG. It is rotated and returned to the lock release position. When a force in the clockwise direction of FIG. 2 is further applied to the operation system lock lever 26 positioned at the lock release position, the operation system lock lever 26 is further rotated in the same direction around the vertical shaft 14, The over-center compression spring mechanism 70 is positioned in the second lock operating position. Even in this case, the third link member 6
It is necessary to provide stopper means for preventing the rotation of the two parts in the same direction (counterclockwise in FIG. 4). For example, it is conceivable to provide the plate 6 with a stopper (not shown) that blocks the rotation of the link 62b. As a result, the third link member 62 has a predetermined rotation position (second lock operation position of the operation system lock lever 26) in which the operation system lock lever 26 rotates from the lock operation release position by a predetermined angle and the rotation is restricted by the stopper. Further, it is held by the biasing force of the first compression spring 74 and the second compression spring 78.

[0025]

As described above, the operating system lock lever at the lock release position can be positioned at the lock operation position not only when it is rotated about the horizontal axis but also when it is rotated about the vertical axis. Therefore, the safety is further improved as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a front view showing a preferred embodiment of an operating system lock device configured according to the present invention.

FIG. 2 is a top view showing a main part of the device shown in FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 Operation System Lock Device 12 Support Frame 14 Vertical Axis 16 Support Bracket 24 Horizontal Axis 26 Operation System Lock Lever 28 First Link Member 30 Second Link Member 32 Frame 34 First Overcenter Compression Spring Mechanism 36 First Spherical Joint Means 38 Rod Member (First member) 40 Second spherical joint means 42 Guide cylinder (second member) 44 Compression spring 58 Cable guide 54 Pilot line relief valve 60 Push-pull cable 62 Third link member 70 Second over-center compression spring mechanism 72 First fixation Shaft 74 First compression spring 76 Second fixed shaft 78 Second compression spring

[Procedure amendment]

[Submission date] June 12, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art As a conventional example of the lock device, for example,
For example, an operation system lock lever rotatably supported by a support frame provided in the operator's cab of a construction machine such as a hydraulic excavator and an operation system lock means provided at the end of the operation system lock lever Device having a child or a push-pull cable having one end connected to the operation system lock lever and the other end connected to the operation system lock means
Can be mentioned . As the locking means of the operation system,
A mechanism for fixing a reach rod for pilot line relief valve or control valve switching control is disclosed. The operation system lock lever is selectively positioned at a lock operation release position extending toward the front of the driver's seat and a lock operation position extending toward the rear of the driver's seat. The two positions of the operation system lock lever are achieved by rotating the operation system lock lever around the horizontal axis.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

When the operation system lock lever is positioned at the lock release position extending toward the front of the driver's seat,
The locking means of the operating system is deactivated via the actuator or the push-pull cable. As a result, the control valve that controls the operation of each actuator in the front (working machine) including, for example, the boom, arm, and bucket is in a state in which it can be operated at any time, and the operator operates the operation lever to perform the necessary work. Be done. On the other hand, when the operator leaves the driver's seat, the operation system lock lever is rotated to the lock operation position extending toward the rear of the driver's seat. As a result, the control valve is locked so that it cannot operate.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

SUMMARY OF THE INVENTION In the above device,
The lock operation release position of the operation system lock lever is a position where the operation system lock lever extends toward the front of the driver's seat. This makes the operator notice that the operation system lock lever is located at the lock release position, and aims to get off the driver's seat after the operator positions the operation system lock lever at the lock operation position. However, there is still a possibility that the operator neglects to position the operation system lock lever at the lock operating position, either intentionally or completely due to carelessness.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

Therefore, an object of the present invention is to position the operation system lock lever in the lock release position at the lock operation position not only when it is rotated about the horizontal axis but also when it is rotated about the vertical axis. Ru can,
An object is to provide an operation system lock device.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Since the operation system lock lever located at the lock release position is located at a position that prevents the operator from getting in and out, if the operator tries to get out of the driver's seat in this state, the operation system lock lever is operated. The system lock lever is located at the position most easily touched by the operator. Therefore, it can be said that the operator can easily receive the horizontal force by the movement of the operator before the operation lever or the operation pedal is erroneously operated. Therefore, when the operation system lock lever receives a horizontal force , it rotates about the vertical axis and is positioned from the lock operation release position to the lock operation position . In addition , as described above, the operation system lock lever can be positioned in the lock operating position by rotating it in any horizontal direction around the vertical axis, so that in an emergency, the operator can easily operate the operation system lock lever in a quick and easy manner. Ru can be positioned in the locking operation release position.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025] Also in the case of rotating about the vertical axis as well when rotating the operating system lock lever in a locked deactuated position about a horizontal axis, Ru can be positioned in the locked operating position.

Claims (3)

[Claims] 1. An operation system lock lever rotatably supported on a horizontal shaft, and a push-pull cable whose one end is operatively connected to the operation system lock lever and the other end is connected to a lock means of the operation system. The operation system lock lever includes a lock operation release position extending toward the front of the driver's seat,
In an operation system lock device selectively positioned at a lock operating position extending toward the rear of the driver's seat, a support bracket fixed to a vertical shaft rotatably provided on a support frame, and the support bracket Of the rotatably provided horizontal shaft, the operation system lock lever having one end fixed to the horizontal shaft, the first link member and the second link member, and the other end of the first link member and the frame. A first over-center compression spring mechanism provided between them, the push-pull cable whose one end is connected to the other end of the second link member, and a third link member whose end is fixed to the vertical shaft, Acting on the third link member, the operating system lock lever was rotated from the lock operation release position and the lock operation release position to the first lock operation position and the other to the one side around the vertical axis. A second over-center compression spring mechanism positioned at a second lock operating position, wherein the first link member is positioned so as to incline substantially rearward and upward when the operation system lock lever is at the lock operation releasing position. And the second link member is positioned so as to extend substantially horizontally toward the rear, and the first overcenter compression spring mechanism has one end connected to the other end of the first link member via a first spherical joint means. The first member connected to the first member and the other end of the first member connected to the frame via the second spherical joint means and the other end of the first member connected to the frame so as to expand and contract in the axial direction. An operation system locking device comprising: a second member engaged with the first member; and a compression spring for urging the first member and the second member in an extension direction. 2. One of the first member and the second member is composed of a guide cylinder, and the other is composed of a rod member slidably inserted into the guide cylinder.
The operation system lock device according to claim 1. 3. The second over-center compression spring mechanism includes the third link member including two links having substantially the same shape and extending in the radial direction at an angle smaller than 180 degrees from the vertical axis, and one end of the third link member. A first compression spring connected to one end of the link and the other end to a first fixed shaft, and a second compression spring having one end connected to the other end of the link and the other end connected to a second fixed shaft. A spring, the first fixed shaft and the second fixed shaft are arranged at a target position with respect to the vertical axis,
The respective axes of the first fixed shaft, the vertical shaft and the second fixed shaft are positioned on a substantially common straight line, and when the operating system lock lever is in the lock release position, each of the links is The tip is positioned on one side of the straight line and the directions of the rotational urging forces applied to the third link member by the first and second compression springs are substantially opposite to each other and the rotational urging force is large. Are defined to be substantially the same, and when the operation system lock lever rotates from the unlocked position to one side about the vertical axis and one of the ends of the link crosses the straight line, the first When the direction of the rotational biasing force of the compression spring applied to the third link member coincides with the direction of the rotational biasing force of the second compression spring applied to the third link member, the operation system lock lever is moved to the first position. 1 The operating system located at the lock operating position When the lock lever rotates from the unlocked position to the other about the vertical axis and the other end of the link crosses the straight line, the rotational urging force applied to the third link member of the second compression spring. The operation system lock lever is positioned at the second lock actuating position by the direction of the arrow coincides with the direction of the rotational biasing force applied to the third link member of the first compression spring. System locking device.