JP2007132121A - Operating means locking structure of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of attaining a half-locked state and easy to switchingly operate. <P>SOLUTION: A construction machine is provided with a control operating part for operating a control part of a control valve, and a swingable operating means such as an operating pedal or an operating lever for operating the control operating part from the outside. A first bracket 13 having an oblong hole and a round hole is inserted and connected, and a second bracket 18 erectly provided with a locking post 20 having a round hole, near the first bracket is fixed to a floor or the like. A locking member 21 with one end having a first projecting part 22 turnably fitted to the round hole of the locking post 20 and with the other end having a second projecting part lockable to the oblong hole and round hole of the first bracket 13 is provided, and the locking member is provided with a switching means 21d switching a locked state to the oblong hole or the round hole. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a structure for locking operation means such as an operation pedal or an operation lever for operating a control valve of a construction machine.

Conventionally, a construction machine such as a hydraulic excavator is provided with an operation lever or an operation pedal for controlling a control valve in a cab. For example, an operation lever for controlling the control valve for turning is provided on the upper side of the console box provided on the left and right sides of the driver's seat, and an operation operation pedal for controlling the control valve for driving is provided in front of the driver's seat. It is. Since these operating levers and operating pedals may be accidentally operated when not operated or not used, a locking means may be provided to prevent operation when not operating. Has been done. Numerous devices have been disclosed as conventional devices provided with such a locking means. For example, Patent Document 1 discloses a conventional apparatus that seems to be most similar to the present invention. Hereinafter, this conventional device (referred to as the conventional device 1) will be briefly described to the extent necessary.
Public utility model gazette, Japanese Utility Model Laid-Open No. 5-83820, Operation lever / pedal lock device for construction machinery

  FIG. 8 is an explanatory diagram of the conventional apparatus 1. In FIG. 8, a support member 51 is fixed to the lower side surface of the operation pedal 50, and a lower end portion of the support member 51 is rotatably supported by a bracket 52 fixed to the floor 53. A boss 54 having a support leg 55 is fixed at a position adjacent to the bracket 52 on the floor 53. An insertion hole 56 is formed at the center of the boss 54, and an insertion hole 58 is formed at a position corresponding to the insertion hole 56 of the support member 51. A stepped shaft 57 is inserted into the insertion holes 56 and 58 so as to be able to advance and retract. An operation lever 62 is provided at the end of the stepped shaft 57. The insertion hole 56 is provided with a key groove, and the stepped shaft 57 is provided with a key so that it cannot rotate. The shaft 57 is configured not to be pulled out by a lid 59 provided at the end of the boss 54, and two lock holes 60a and 60b are provided on the side surface opposite to the key of the shaft 57. On the other hand, the insertion hole 56 of the boss 54 is provided with a detent mechanism 61 for engaging the two lock holes 60a and 60b and locking the stepped shaft 57 at an appropriate position.

With the above configuration, when the operation pedal 50 is locked, when the lock lever 62 is pushed inward (in the direction opposite to the arrow in the figure) and pushed until the head of the shaft 57 comes into contact with the lid 59, the tip of the shaft 57 Is inserted into the insertion hole 58, and the lock hole 60a comes into the locked state when it reaches the position of the detent mechanism 61. When releasing the lock, pulling the lock lever 62 outward (arrow direction) releases the lock hole 60a. When pulled further, the lock hole 60b engages with the detent mechanism 61 and the lock is released. The operation pedal 50 is connected by a mechanism not shown so that the swing of the operation pedal 50 can control the control valve. This connecting means is disclosed in, for example, Patent Document 1 and Patent Document 2.
Published patent publication, JP 2002-294661, construction pedal lock structure of construction machine

In the lock device of the conventional device 1 (the same applies to other conventional devices), there are only two states, a locked state and an unlocked state (lock-free state). However, when pressure oil is supplied only in one direction as in the operation of a breaker or the like, there is a problem that operation of the pedal or the like is complicated in the unlocked state, fatigue is accumulated in the operator, and work efficiency is deteriorated.

This invention is made | formed in view of the said fact, and makes it a subject to provide the apparatus which can also implement | achieve a half-lock state and is easy to operate.

The present invention employs the following configuration as means for solving the above-described problems. That is,
The invention according to claim 1 is provided with operation means such as an operation pedal or an operation lever for operating the control valve, and locks the operation means to be inoperable when the operation means is not operated, and the lock A construction machine operating means locking structure having an opening means for opening the door is characterized in that a half lock structure for locking only a part of the operable range of the operating means is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control operation unit that operates the control unit of the control valve and the swing of an operation pedal or an operation lever that operates the control operation unit from the outside. In a construction machine having a movable operation means, a first bracket having a long hole and a round hole is inserted and connected between the control operation portion and the operation means, and a round hole is formed in the vicinity of the first bracket. A second bracket having a lock strut having an upright is fixed to a floor or the like, and has a first protrusion at one end, which is pivotably fitted to a round hole of the lock strut, and a first at the other end. A lock member having a second protrusion that can be locked in the long hole and the round hole of the bracket is provided, and a switching means for switching the locking state with the long hole or the round hole is provided in the lock member. Yes.

  The invention according to claim 3 is the invention according to claim 2, wherein the lock member is formed of a plate-like member, and the first protrusion and the second protrusion are provided on the same side surface of the plate-like member, The switching means is provided with a handle on the opposite side of the plate-like member, and is provided so that the plate-like member can be moved toward and away from the first bracket, and further, the plate-like member is attached so as to approach the first bracket. When the plate-like member is separated by providing a biasing spring, the second projecting portion is disengaged from the elongated hole and the round hole of the first bracket, and can be rotated to the outer position of the first bracket. And when this plate-shaped member was made to approach, it comprised so that it might be fixed to this long hole position, this round hole position, or this outer side position.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a third protrusion is provided in the middle of the lock member, and a ridge is provided at substantially the center of the head of the lock column. In addition, an inclined portion is provided on one side of the peak portion so as to be engaged with the third projecting portion to maintain the unlocked state.

  The invention according to claim 5 is the invention according to claim 4, wherein the second protrusion and the third protrusion are fixed to the plate-like member by penetrating both ends of the U-shaped member. It is characterized in that the bottom portion of the shaped member is configured as a handle portion of the switching means.

  According to the present invention, the half-locked state is provided in addition to the locked state and the unlocked state (hereinafter referred to as the free state), and the switchable configuration is possible. Therefore, an operation that only requires supply of pressure oil in one direction (for example, a breaker operation) ), The pedal operation is simplified and the operator's fatigue can be reduced.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a front view of an embodiment of the present invention, and FIG. 2 is a side view as seen from the right side of FIG. 1 and 2, the control valve 11 is fixed to the floor (or frame) 10 with bolts 15. The control valve 11 can be controlled (operated) by swinging the control operation portion 12 of the control valve 11 in the front-rear direction (left-right direction in the figure). This will be described later. The first bracket 13 is disposed on the upper side of the control operation unit 12 and is fixed with bolts 14. A member 16 a fixed to the lower side of the operation pedal 16 is attached to the upper portion of the first bracket 13 by bolt means 17.

  In addition, the second bracket 18 is fixed to an appropriate position on the floor 10 (in the vicinity of the first bracket) with a bolt 19. A lock column 20 is fixed vertically to the second bracket 18 by welding or the like. A lock member 21 is rotatably connected by a pin member 22 to a round hole 22 a provided in the lock column 20. Hereinafter, the configuration and function of each part will be described in detail.

  FIG. 3 shows a top view (A), a front view (B), and a perspective view (C) of the first bracket 13. As shown in the drawing, the first bracket 13 includes a plate-like member 13 a provided with a long hole 25 and a round hole 26, and a fixing member 13 b for fixing to the control operation unit 12. The fixing member 13b is fixed vertically to the bottom end of the plate-like member 13a, and a bolt hole 13c for fixing with a bolt 14 is provided on the upper side surface of the control operation unit 12. A screw hole 13d for attaching to the member 16a fixed to the lower side of the operation pedal 16 is cut at the upper part of the plate-like member 13a, and a nut 13e is fixed to the back surface.

  FIG. 4 shows an example in which the first bracket 13 is mounted on the control valve 11. In FIG. 4, the control valve 11 includes a valve body 11a, an upper lid 11b, and a control operation unit 11c. The valve body 11a is provided with a plurality of hydraulic input / output ports and switching oil passages. The valve body 11a may employ various known hydraulic circuits, but the details are omitted. The oil passage provided in the valve body 11a is switched by the vertical movement of the switching rods 11d and 11e. The switching rods 11d and 11e are biased by a spring from the lower side (not shown), and a ball provided at the tip of the switching rod 11d presses the lower surface of the control operation portion 11c. Further, the control operation unit 11c is provided so as to be swingable by a pin 11f. The control operation unit 11 c is fixed to the first bracket 13 with bolts 14. Accordingly, the first bracket 13 is also configured to be swingable about the pin 11f. Therefore, the center line 25a of the elongated hole 25 is a circular arc centered on the pin 11f. The operation unit 11 c is covered with a dust cover 28.

  5A and 5B are detailed views of the second bracket, wherein FIG. 5A shows an upper plan view, FIG. 5B shows a front view, and FIG. 5C shows a side view. (D) shows a perspective view. In FIG. 5, the second bracket 18 has a configuration in which the lock support 20 is fixedly fixed to the approximate center of the fixing plate 18a. The fixing plate 18a is provided with fixing bolt holes. A pin hole 20a is provided on the upper portion of the lock column 20, and inclined portions 20b and 20c curved on both sides of the ridge portion 20d are provided on the upper surface of the head. Is provided. The inclined portion 20b is for maintaining a lock-free state. When a later-described third protrusion 21c is positioned on the inclined portion 20b, the rocking is restricted by the peak portion 20d, and the lock-free state is maintained. Moreover, the 3rd projection part 21c is located in the inclination part 20c at the time of a locked state and a half lock state.

  6A and 6B are detailed views of the lock member 21, wherein FIG. 6A shows a side view and FIG. 6B shows a front view. (C) shows a perspective view. The lock member 21 is fixed in a protruding state with both end portions 21b and 21c of the U-shaped bar passing through the upper half of the lock plate 21a. Further, the pin member 22 is constituted by a round bar threaded at one end, and the central part is constituted to be fitted to the pin hole 20a of the lock column 20 so as to be rotatable and slidable in the axial direction. . The second protrusion 21b is configured to be insertable into the long hole 25 and the round hole 26 of the plate-like member 13 in a state where the pin member 22 is fitted in the pin hole 20a. When the second protrusion 21b is inserted into the elongated hole 25, the third protrusion 21c is positioned on the center side of the inclined portion 20c of the lock column 20, and when the second protrusion 21b is inserted into the round hole 26. It is located on the end side of the inclined portion 20c of the lock column 20. Further, when the second projecting portion 21 b is outside the plate-like member 13 (the right outer side in the figure), the third projecting portion 21 c is located on the inclined portion 20 b of the lock column 20.

  FIG. 7 is a diagram illustrating the assembly and disassembly of the parts described above. First, the control valve 11 is fixed to the floor 10 with bolts 19. Next, after attaching the dust cover 28, the first bracket 13 is fixed to the control operation portion 11 c of the control valve 11 with the bolt 14. Thereafter, the member 16 a of the operation pedal 16 is fixed to the upper portion of the first bracket 13 with a bolt and nut 17. On the other hand, the second bracket 20 is fixed on the floor 10 with a bolt 19 at a predetermined position. Next, the screw portion of the pin member 22 of the lock member 21 is inserted into the round hole 20a from the right side of the lock column 20 as shown in the figure, the coil spring 30 is mounted from the left side of the lock column 20, and the pin member 22 is Screw onto the threaded part and fix. That is, the coil spring 30 is urged so that the left side surface of the lock plate 21a and the right side surface of the lock column 20 are in contact except during the switching operation.

  In a state where the left side surface of the lock plate 21 a and the right side surface of the lock column 20 are in contact with each other, the tip of the protruding portion 21 b is inserted into the elongated hole 25 or the round hole 26 of the first bracket 13 or detached from the first bracket 13. To be. In the state where the tip of the projection 21b is inserted into the round hole 26, the projection 21c is positioned at the inclined portion 20c, and the switching of the control valve 11 is in a neutral state. When the left side surface of the lock plate 21a and the right side surface of the lock column 20 are in contact with each other, and the tip of the protrusion 21b is inserted at the lower end position of the elongated hole 25 of the first bracket 13, the protrusion 21c is in contact with the inclined portion 20c. In addition, the control valve 11 is configured to be in a neutral state.

  Since the present embodiment is configured as described above, it functions as follows. That is, when the operation pedal 16 is locked, first, the operation pedal 16 is returned to a position where the control valve 11 becomes neutral. Next, the handle 21d of the lock member 21 is pulled away from the lock column 20 to bring the lock member 21 into a freely rotating state. Finally, the lock member 21 is rotated until the second protrusion 21 b reaches a position where it can be inserted into the round hole 26, and the first protrusion 21 b is inserted into the round hole 26. At this time, the third protrusion 21 c is located at the (right) end of the inclined portion 20 c of the lock column 20. By this operation, the operation pedal 16 is locked. In addition, the figure shown with the continuous line in which the locking member 21 of FIG. 1 inclines to the left side shows a locked state.

  When the operation pedal 16 is in the half-locked state, the operation pedal 16 is returned to a position where the control valve 11 is in the neutral state, the handle 21d of the lock member 21 is pulled away from the lock column 20, and the lock member 21 is turned. Make it free to move. Finally, the lock member 21 is rotated until the second projecting portion 21 b reaches a position where the second projecting portion 21 b can be inserted into the lower end of the elongated hole 25, and the first projecting portion 21 b is inserted into the elongated hole 25. By this operation, the operation pedal 16 is in a half-locked state. The figure shown with the dotted line in which the locking member 21 of FIG. 1 stands upright shows a half-lock state. At this time, the third protrusion 21 c is located on the center side of the inclined portion 20 c of the lock column 20.

  When the operation pedal 16 is to be in a free state, the operation pedal 16 is returned to a position where the control valve 11 is in a neutral state, the handle 21d of the lock member 21 is pulled away from the lock column 20, and the lock member 21 is rotated. In a free state, the lock member 21 is rotated until the second protrusion 21b is disengaged from the first bracket 13, that is, the third protrusion 21c is positioned at the inclined portion 20b of the lock column 20, and the third protrusion In the state where 21c is locked to the inclined portion 20b, the hand is released. The figure shown with the dotted line in which the locking member 21 of FIG. 1 inclines to the right side shows a free state.

  As described above, according to the present embodiment, since the half-locked state is provided in addition to the locked state and the free state, in the operation of the breaker or the like that only needs to be supplied with one pressure oil, the half-locked state is set. It is only necessary to depress the pedal 16 forward while pressing the heel against the pedal 16, and the pedal operation is simplified, and the operator's fatigue can be reduced. In addition, the switching between these three states has a feature that it is only necessary to pull the handle 21d by hand against the urging force of the spring 30 and turn it slightly, and the switching operation is simple.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the technical scope of the present invention is not limited to this, and for example, the technique of the present invention can be applied even when the pedal 16 is depressed backward. Belongs to a range.

The front view of the embodiment of the present invention is shown. The right side view of this embodiment is shown. It is detail drawing of a 1st bracket, (A) Top view, (B) Front view, (C) A perspective view is shown. The figure which attached the 1st bracket on the control valve is shown. It is detail drawing of a 2nd bracket, (A) Top plan view, (B) Front view, (C) Side view, (D) Perspective view is shown. It is detail drawing of a locking member, (A) Side view, (B) Front view, (C) Perspective view. Part assembly and exploded view are shown. A conventional apparatus is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Floor 11 Control valve 11a Control valve main body 11b Control valve upper cover 11c Control operation part
11d, 11e Oil passage switching rod 11f Pin 13 First bracket 16 Pedal 18 Second bracket 20 Lock strut 20a Pin hole 20b Inclined part (for unlocking)
20d Peak 21 Lock member 21b 2nd projection 21c 3rd projection 21d Handle (switching means)
22 Pin member (first protrusion)
25 Long hole (for half lock)
26 Round hole (for lock)
30 Coil spring

Claims (5)

Construction comprising an operation means such as an operation pedal or an operation lever for operating the control valve, and a lock means for disabling the operation means when the operation means is not operated and an opening means for releasing the lock A lock structure for operating means of a construction machine, characterized in that a half lock structure for locking only a part of the operable range of the operating means is provided in the operating means lock structure of the machine. In a construction machine including a control operation unit that operates a control unit of a control valve and a swingable operation unit such as an operation pedal or an operation lever that operates the control operation unit from outside, the control operation unit and the operation A first bracket having a long hole and a round hole is inserted and connected to the means, and a second bracket having a lock column having a round hole in the vicinity of the first bracket is fixed to a floor or the like, A lock member having a first protrusion that fits in a freely rotating manner with the round hole of the lock column at one end, and a second protrusion that can be engaged with the elongated hole and the round hole of the first bracket at the other end. 2. The lock structure for operating means of construction machinery according to claim 1, wherein a switching means for switching the locking state of the elongated hole or the round hole is provided on the lock member. The locking member is constituted by a plate-like member, the first protrusion and the second protrusion are provided on the same side of the plate-like member, the switching means is provided with a handle on the opposite side of the plate-like member, If the plate-like member is provided so as to be able to approach and separate from the first bracket, and further provided with a spring for biasing the plate-like member in a direction approaching the first bracket, the plate-like member is separated from the first bracket. 2 When the protruding portion is disengaged from the elongated hole and the round hole of the first bracket and can be rotated to the outer position of the first bracket, and the plate-like member is brought close, the elongated hole position, 3. The lock structure for operation means of a construction machine according to claim 2, wherein the lock structure is fixed to a round hole position or the outer position. A third protrusion is provided in the middle of the lock member, and a ridge is provided at substantially the center of the head of the lock column, and the lock is released by being locked to the third protrusion on one side of the ridge. 4. A lock structure for operating means of a construction machine according to any one of claims 2 and 3, wherein an inclined portion is provided. The second protrusion and the third protrusion are configured such that both ends of the U-shaped member are passed through and fixed to the plate-shaped member, and the bottom of the U-shaped member is used as the grip portion of the switching means. The lock structure for operation means of a construction machine according to claim 4.

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