JP4413669B2 - Gate lock device for construction machinery - Google Patents

Description

  The present invention relates to a gate lock device for a construction machine such as a hydraulic excavator, and in particular, when an operator enters and exits a cab, a console box with an operation lever for operation and a gate lock lever are moved up to move a boarding / alighting passage. The present invention relates to a gate lock device for a construction machine that is secured.

In general, some of these construction machines are provided with a console box provided with a working lever for controlling the operation of the working actuator and a gate lock lever for blocking a boarding / exiting passage to the cab. In this structure, the gate lock lever protrudes from the front of the console box into the entrance / exit passage so that it gets in the way when the operator gets in and out of the cab. It is excluded from the inside of the passage, thereby securing the entrance / exit passage (see, for example, Patent Documents 1 and 2).
JP-A-9-209405 Utility Model Registration No. 2547117

  In the invention described in Patent Document 1, when the lifting lever is lifted, the guide-shaped slot of the guide plate slides along the guide pin, and the control is performed until just before reaching the bending point of the guide-shaped guide slot. The box is held in the locked position during operation, and the control box is lifted upward by the spring force of the mainspring spring when the bending point of the helical guide slot is reached. As a result, it is possible to rotate only the spring lever to the rear position while holding the control box in the locked position during work. Because the spring springs up suddenly, there is a danger that the control lever will hit the operator's body. In particular, the control box and the lift-up lever are not linked to the rigid, so the control box will be lifted up by the spring-up lever. There was a problem that it could not be controlled and was dangerous.

  On the other hand, the device disclosed in Patent Document 2 is provided with a lever on the front side surface of the control box that prevents the driver from getting off, and a limit switch that operates only when the lever is operated to the front lower end position a. Is operated within the range from the front lower end position a to the rear intermediate position b, and only the control lever is locked so that it cannot be operated without tilting the control box rearward. The control box can be tilted to the rear end position by rotating to the upper end position c. As a result, only the lever is rotated while the control box is held at the front end position to ensure a certain width of the entrance / exit passage, and the entrance / exit is possible. The hook of the hook bracket comes off from the hook engaging pin at the moment when it is rotated, and there is a danger that the control box will suddenly spring up due to the spring force of the gas spring and the operating lever may hit the operator's body. Since the rear end pin of the rod is slidable, there is a play between the control box and the lever, and there is a problem that the control box can not be lifted up by the lever.

  Therefore, when the operator gets on and off the cab, depending on the operator's body shape, it is convenient if only the gate lock lever can be rotated to the standing posture position while holding the console box in the working posture position. When it is necessary to move from the work posture position to the boarding posture position, the operation is easy if the lock that restrains the console box at the work posture position can be easily released and moved to the boarding posture position. If the console box can be flipped up with the gate lock lever, the danger of sudden jumping up of the console box can be prevented.

  Therefore, when it is necessary to move only the gate lock lever away from the entrance / exit passage while the console box is held in the work posture position and to move the console box to the ride posture position, the console box is moved to the work posture position. It is possible to easily release the lock that restrains the vehicle and move it to the position for getting on and off, and there arises a technical problem to be solved to make it possible to control the jumping up of the console box with the gate lock lever. The present invention aims to solve this problem.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 comprises a console box having an operation lever for operation and a gate lock lever protruding forward of the console box, The console box can be moved up and moved from a working posture position enabling operation of the working operation lever to a riding posture position where a boarding / alighting passage is secured, and the gate lock lever is moved forward of the console box. It is a gate lock device for a construction machine that is provided so as to be movable from a lying posture position that protrudes and shuts off the entrance / exit passage to a standing posture position that moves backward to the console box side and secures a part of the entrance / exit passage. Te, and locking means for locking so as not to flip-up the console box in the working attitude position,
Construction provided with unlocking means for releasing the lock of the locking means in conjunction with the movement when the gate lock lever is moved from the standing posture position to the unlocking position further retracted to the console box side In the gate lock device of the machine ,
The locking means and the unlocking means include a notch-like engaging portion provided in a fixed frame that pivotally supports the console box, a lock lever provided with an engaging pin that can be moved into and out of the engaging portion, and the lock There is provided a gate lock device for a construction machine which includes a link plate which controls movement of an engagement pin of a lever and has one end connected to the gate lock lever and a guide pin which guides the movement of the link plate .

  According to this configuration, when the gate lock lever is moved from the lying posture position to the standing posture position while the console box is locked at the working posture position, a certain boarding / alighting passage space is secured. Further, when the gate lock lever is further tilted backward from the standing posture position, the locking means for the console box is also released at the same time, and the console box moves together with the gate lock lever from the working posture position to the riding posture position. A large entrance / exit passage can be secured by the movement of the gate lock lever and the console box.

  According to this configuration, the console box can be reliably locked to the working posture position, and can be reliably released when the console box is flipped up to the boarding posture position.

According to a second aspect of the present invention, the link plate includes a moving guide groove capable of rotating the gate lock lever from a lying posture position to a standing posture position when the console box is in a working posture position, and a gate. When the lock lever moves from the standing position to the unlock position, the cam surface that moves the engagement pin to the unlock position and the lock is released, and the console box moves from the work position to the boarding position. A fixing guide groove for preventing the gate lock lever from coming off from the track at the unlocking position while jumping up is provided, and the moving guide groove, the cam surface, and the fixing guide groove are formed continuously. A gate lock device for a construction machine according to claim 1 is provided.

  According to this configuration, only the gate lock lever can be rotated from the lying posture position to the standing posture position while the console box is held in the working posture position, and a certain boarding / alighting passage width is secured without raising the console box. Yes, you can get on and off. Also, when the gate lock lever is rotated from the standing posture position to the lock release position and the engagement between the engagement pin and the engagement portion is released, the console box and the gate lock lever try to jump up integrally. The swing of the console box can be controlled by operating the lock lever.

The invention according to claim 3 is provided with a stopper for preventing the engagement pin of the lock lever from sliding on the upper portion of the guide cam formed upward from the notch-shaped engagement portion provided in the fixed frame, Stopper that restricts forward tilting of the gate lock lever alone at and near the boarding / alighting posture position of the console box and prevents movement of the gate lock lever or link plate in the vicinity of the pivot axis of the gate lock lever of the console box A gate lock device for a construction machine according to claim 1 or 2 , wherein a rearward tilt of the console box at a position for getting on and off of the console box and a gate lock lever alone in the vicinity thereof is limited .

  According to this configuration, it is possible to restrict forward tilt and rear tilt of the gate lock lever alone at and near the boarding / alighting posture position of the console box, and the gate lock lever and the console box rotate integrally.

According to a fourth aspect of the present invention, there is provided the gate lock device for a construction machine according to the third aspect , wherein the guide cam provided on the fixed frame has an arcuate outer peripheral surface centering on the pivot axis of the console box. To do.

  According to this configuration, in the rotation from the unlock position of the gate lock lever to the position for getting on and off the console box, the engagement pin smoothly moves on the guide cam while maintaining the track of the unlock position. The console box can be slid from the lock release position of the gate lock lever while it is in contact with the gate lock lever or the link plate movement prevention stopper provided near the pivot axis of the gate lock lever of the console box. Since it can be rotated to the position, it is possible to more reliably prevent backward tilting by the gate lock lever alone.

  According to the first aspect of the present invention, when the body shape of the operator is small, the console box can be moved to and from the standing posture position by moving only the gate lock lever while the console box is locked at the working posture position. As a result, it is only necessary to move the gate lock lever without moving the console box, which contributes to simplification of operation. Also, when it is necessary to move the console box from the work position to the boarding position, if the gate lock lever is further tilted back to the unlock position, the lock on the console box is automatically released. Since it can be moved from the working position to the boarding position, this further contributes to the simplification of the operation.

This invention, by the rotation of the gate lock lever can be reliably locked and unlocking of the console box, also contributes to simplification of the operation.

According to the second aspect of the present invention, it is possible to perform a boarding / alighting while securing a certain boarding / alighting passage width by merely rotating the gate lock lever from the lying down posture position to the standing posture position without jumping up the console box. In addition, when the console box is flipped up from the work position to the boarding position, the console box can be controlled by operating the console box and the gate lock lever and attached to the console box. It is possible to prevent the danger that the operating lever that is present hits the operator's body.

In the invention according to claim 3, the gate lock lever and the onsole box can be moved integrally by restricting the forward tilt and the rear tilt of the gate lock lever alone in the position for getting on and off the console box and in the vicinity thereof. Therefore, the swing of the console box can be controlled by operating the gate lock lever, and the danger that the operation lever attached to the console box hits the operator's body can be prevented.

According to the fourth aspect of the present invention, when the gate lock lever is moved from the unlocked position to the position for getting on and off the console box, smooth rotation is ensured, and the gate lock lever alone is more reliably prevented from being tilted backward. Therefore, it is possible to prevent a danger that the operation lever attached to the console box hits the operator's body.

  Hereinafter, a gate lock device for a construction machine according to the present invention will be described with reference to preferred embodiments. FIG. 1 is an overall side view of a hydraulic excavator to which the present invention is applied, and FIG. 2 is a perspective view showing a schematic configuration inside a cab in the hydraulic excavator. 3 is a side view showing a schematic configuration around the console box in the cab, FIG. 4 is an enlarged sectional view taken along line AA in FIG. 3, and FIG. 5 is an enlarged sectional view taken along line BB in FIG. The figure is shown. 6 is a side view of a single link plate attached to the console box, FIG. 7 is a side view showing a schematic configuration around the console box in a state where the gate lock lever is placed in a standing posture position, and FIG. 8 is a gate view. It is a side view which shows schematic structure of a console box periphery in the state which has arrange | positioned the lock lever in the lock release position, and the state which has arrange | positioned the console box in the boarding position.

  In FIG. 1, reference numeral 10 denotes a hydraulic excavator, and an upper swing body 13 is rotatably mounted on a lower traveling body 11 of the hydraulic excavator 10 via a swing mechanism 12. The upper swing body 13 is provided with a cab 14 on one front side thereof, and a boom 15 is attached to the front center portion so as to be able to be raised and lowered. Further, an arm 16 is attached to the tip of the boom 15 so as to be rotatable up and down, and a bucket 17 is attached to the tip of the arm 16.

  In FIG. 2, reference numeral 14 denotes a cab, and console boxes 18 are arranged on both the left and right sides in the cab 14. A work operation lever 19 for operating various work hydraulic actuators (not shown) for operating the upper swing body 13, the boom 15, the arm 16, and the bucket 17 is provided at the front upper portion of the console box 18. A gate lock lever 20 is provided at the lower part of the front surface to block the entrance / exit passage of the cab 14.

  3 to 5, the rear portion of the console box 18 is pivotally supported by a fixed frame 22 attached to the chassis 21 via a pivot 23 so as to be swingable up and down. As a result, the console box 18 swings in the vertical direction on the front side, and a working posture position in which the operator sitting on the driver's seat 24 (see FIG. 2) takes a substantially horizontal working posture that easily grips the working operation lever 19. (The position shown in FIG. 3) and the front side move up and jump up, and when the operator gets on and off the driver's seat 24, the operation lever 19 is in an unobstructed posture (one point in FIG. 8). The position can be switched to the position indicated by the chain line). It should be noted that a spring 25 as an urging means that constantly applies an urging force for rotating and urging the console box 18 to the getting-on / off posture position between the rear end of the console box 18 and the chassis 21. Is installed.

  The gate lock lever 20 is attached to the side surface of the console box 18 via a pivot 26 so as to be rotatable in the vertical direction. The gate lock lever 20 is located on the opposite side of the gate lock portion 20a across the pivot 26 and a gate lock portion 20a that projects forward from the front surface of the console box 18 and blocks the entrance / exit passage of the cab 14. The link arm 20b is integrally formed, and a hole 20c is provided at the tip of the link arm portion 20b. When the gate lock lever 20 is rotated about the pivot 26 as a fulcrum, the gate lock portion 20a is retracted from the boarding passage from the lying down position (the position indicated by the solid line in FIG. 3) where the gate lock portion 20a blocks the boarding passage. It can be rotated through the standing posture position (the position indicated by the one-dot chain line in FIG. 3) to the unlocking position (the position indicated by the two-dot chain line in FIG. 3) further rotated toward the console box 18 side. .

  A coil spring 27 as an urging means is disposed between the gate lock portion 20a and the console box 18. When the gate lock portion 20a is disposed in the lying posture position, the coil spring 27 is disposed on the lower side of the pivot shaft 26 to the gate lock lever 20 in the counterclockwise direction around the pivot shaft 26 in FIG. When the rotation urging force is always applied and the gate lock portion 20a is disposed in the standing posture position, the extending position of the coil spring 27 is disposed on the upper side of the pivot 26 to the gate lock lever 20 in FIG. 26 is configured to always apply a rotational biasing force in the clockwise direction around 26. Thereby, after the position of the gate lock lever 20 is switched, the gate lock lever 20 can be held at the position after switching by the biasing force of the coil spring 27.

  Further, a link mechanism 28 is provided between the console box 18 and the fixed frame 22. The link mechanism 28 includes a lock unit 51 that locks the console box 18 so that it cannot be flipped up at the work position, a lock release unit 52 that releases the lock by the lock unit 51, and the like.

  The link plate 29 constituting the lock means 51 and the lock release means 52 has a link pin whose front end 29a side is inserted and engaged in common with the hole 49 on the front end 29a side and the hole 20c of the gate lock lever 20. The gate lock lever 20 is pivotally linked via 50. On the other hand, the rear end 29b side is slidably mounted on a guide pin 31 protruding outward from the console box 18. Accordingly, the link plate 29 slides in the front-rear direction in conjunction with the vertical rotation of the gate lock lever 20. Further, as shown in FIG. 6, the link plate 29 is integrally formed with a protruding portion 29c extending upward on the rear end 29b side, and the rear end 29b and the protruding portion 29c are formed. A guide cam portion 32 cut at approximately 45 degrees is provided at the intersecting corner portion. Then, an L-shaped long hole 33 constituted by the moving guide groove 33A, the cam surface 33B, and the fixing guide groove 33C is opened from the rear end 29b to the protruding portion 29c.

  An upper end side of the lock lever 30 is attached to the side surface of the console box 18 so as to be swingable in the vertical direction via a pivot shaft 34, and an engagement pin 35 projects outwardly at a substantially right angle on the lower end side. The engaging pin 35 is slidably engaged with the elongated hole 33 of the link plate 29. Further, a coil spring 38 as an urging means is disposed between the lock lever 30 and the console box 18, and the lock lever 30 is pivoted 34 in FIG. 3 by the pulling force of the coil spring 38. Rotation bias is always applied in the counterclockwise direction around the center.

  The fixed frame 22 is provided with a notched engaging portion 36 corresponding to the engaging pin 35 of the lock lever 30, and the console box 18 is swung upward from the notched engaging portion 36. A guide cam 37 having an arcuate outer peripheral surface centered on the pivot shaft 23 is formed, and a stopper 39 for preventing the engagement pin 35 from sliding is provided on the upper portion of the guide cam 37, and The console box 18 is provided with a stopper 40 that abuts the gate lock lever 20 in the unlocked position near the pivot 26 of the gate lock lever 20 and prevents the gate lock lever 20 or the link plate 29 from moving. . The locking means 51 and the unlocking means 52 are provided with a notched engaging portion 36 provided on the fixed frame 22 that pivotally supports the console box 18 and an engaging pin 35 that can enter and exit the engaging portion 36. A lock plate 30 provided with a link plate 29, a movement of an engagement pin 35 of the lock lever 30, a link plate 29 having one end connected to the gate lock lever 20, and a guide for guiding the movement of the link plate 29. It consists of pins 31.

  7 and 8 are operation state diagrams of the gate lock device configured as described above. The operation of the gate lock device according to this embodiment will be described next with reference to FIGS.

  In the state shown by the solid line in FIG. 3, the console box 18 is in the working posture position and the gate lock lever 20 is in the lying posture position. Further, the link plate 29 moves rearward, the engaging pin 35 engaged in the moving guide groove 33A engages with the engaging portion 36 of the fixed frame 22, and the locking means 51 is locked. Therefore, the console box 18 is locked at the working posture position and cannot be moved to the getting-on / off posture position.

  FIG. 7 shows a state in which the gate lock lever 20 is moved from the lying posture position to the standing posture position. In this movement, the engaging pin 35 is released by the moving guide groove 33A, and only the link plate 29 moves to the front side in conjunction with the rotation of the gate lock lever 20. Therefore, when the link plate 29 is moved, the engaging pin 35 does not move, but remains engaged with the engaging portion 36 and the locking means 51 is in the locked state. When the gate lock lever 20 is moved to the standing posture position, a space for the boarding / alighting passage is secured to some extent, and a person with a slender body can get on and off using this space.

  FIG. 8 shows that the console box 18 is further moved from the state in which the gate lock lever 20 is further moved from the standing position to the unlock position (see the solid line in the figure) and the gate lock lever 20 is moved to the unlock position. The state (refer to the dashed-dotted line in a figure) moved to the boarding position for boarding / exiting is shown. That is, when the gate lock lever 20 is further moved from the standing posture position to the unlocking position, the cam surface 33B of the long hole 33 abuts the engagement pin 35 in the middle, and the engagement pin 35 is moved together with the lock lever 30 to the front side. And is pulled out from the engagement portion 36.

  When the gate lock lever 20 reaches the unlocked position, the engagement pin 35 and the engagement portion 36 are disengaged, and the console box 18 is moved from the working position to the loading / unloading position by the urging force of the spring 25. It swings automatically to the position, and a sufficient boarding / exiting passage can be secured. At this time, the engagement pin 35 of the lock lever 30 slides on the guide cam 37 provided on the upper portion of the notch-shaped engagement portion 36 of the fixed frame 22 and stops by contacting the stopper 39. The gate lock lever 20 is prevented from tilting backward relative to the console box 18 by a stopper 40 provided in the vicinity of the pivot 26 of the gate lock lever 20, and the gate lock lever 20 and the console box 18 are integrated. Oscillates.

  The guide pin 31 fixed to the fixed frame 22 supports the lower end of the link plate 29 and raises the gate lock lever 20 when the gate lock lever 20 rotates from the lying posture position to the standing posture position. When tilting backward from the posture position to the unlocking position, the guide cam portion 32 is guided by the guide pin 31, and the engagement pin 35 moves into the fixing guide groove 33C while the link plate 29 rotates, and the gate The rotation of the lock lever 20 to the unlock position is allowed.

When the boarding / exiting is finished and the console box 18 is returned from the boarding / posting position to the working position, the engaging pin 35 is lowered while coming into contact with the guide cam 37, and the engaging pin 35 is subjected to the reverse operation. The link plate 29 and the gate lock lever 20 are automatically returned to the state shown in FIG. 7 by the urging force of the coil spring 38, and the lock means 51 is again locked.
When the console box 18 is returned from the boarding position to the working position, the link is made so that the engagement pin 35 moves from the fixing guide groove 33C into the moving guide groove 33A via the cam surface 33B. The plate 29 is regulated.

  Furthermore, when the gate lock lever 20 is returned from the standing posture position to the lying posture position, the state shown by the solid line in FIG. 3 can be restored.

  Therefore, in the gate lock device of the present embodiment, when the operator's body shape is slender, the console box 18 is locked in the working posture position, and only the gate lock lever 20 is moved to the standing posture position to get on and off. Can do. Thereby, since it is not necessary to move only the gate lock lever 20 and move the console box 18, it is possible to simplify the operation, and it is necessary to move the console box 18 from the working posture position to the standing posture position. Even when the gate lock lever 20 is rotated to the console box 18 side, the lock means 51 is automatically unlocked by the lock release means 52 from the work posture position to the standing posture position. Therefore, the operation can be simplified. Further, when the console box 18 is swung from the working posture position to the boarding / exiting posture position, the console box 18 and the gate lock lever 20 are integrally rotated. Oscillation can be controlled, and the danger that only the console box 18 jumps up and the operation lever 19 hits the operator's body can be prevented.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The figure shows an embodiment of the present invention.
1 is an overall side view of a hydraulic excavator to which the present invention is applied. The perspective view which shows schematic structure in the cab in the hydraulic excavator. The side view which shows schematic structure of the console box periphery in the cab. FIG. 4 is an enlarged sectional view taken along line AA in FIG. 3. FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3. The side view with the single link plate attached to the console box. The side view which shows schematic structure of a console box periphery in the state which has arrange | positioned the gate lock lever in the standing position. The side view which shows schematic structure of a console box periphery in the state which has arrange | positioned the gate lock lever in the lock release position, and the console box in the position for boarding / alighting.

Explanation of symbols

18 console box 19 operation lever 20 gate lock lever 20a gate lock part 20b link arm part 21 chassis 22 fixed frame 23 pivot 25 spring 26 pivot 27 coil spring 28 link mechanism 29 link plate 30 lock lever 31 guide pin 32 guide cam part 33 Slot 33A Movement guide groove 33B Cam surface 33C Fixing guide groove 34 Pivot 35 Engagement pin 36 Engagement part 37 Guide cam 38 Coil spring 39 Stopper 40 Stopper 51 Lock means 52 Lock release means

Claims (4)

A console box having a work operation lever and a gate lock lever projecting forward of the console box, and a boarding passage is secured from a work posture position at which the console box enables operation of the work operation lever. The gate lock lever protrudes in front of the console box and blocks the entrance / exit passage, and then retreats toward the console box from the lying down posture position. A locking device for locking the console box so that the console box cannot be flipped up at the working posture position.
Construction provided with unlocking means for releasing the lock of the locking means in conjunction with the movement when the gate lock lever is moved from the standing posture position to the unlocking position further retracted to the console box side In the gate lock device of the machine ,
The locking means and the unlocking means include a notch-like engaging portion provided in a fixed frame that pivotally supports the console box, a lock lever provided with an engaging pin that can be moved into and out of the engaging portion, and the lock A gate lock for a construction machine characterized by comprising a link plate for controlling the movement of the engaging pin of the lever and having one end connected to the gate lock lever and a guide pin for guiding the movement of the link plate. apparatus. The link plate includes a moving guide groove that allows the gate lock lever to be rotated from the lying position to the standing position when the console box is in the working position, and the gate lock lever is locked from the standing position. A cam surface that moves the engagement pin to the unlock position when moved to the release position, and the gate lock lever is released while the lock is released and the console box jumps from the work position to the boarding position. 2. The fixing guide groove for preventing the lock from being released from the track at the unlocking position is provided, and the moving guide groove, the cam surface, and the fixing guide groove are formed continuously . Gate lock device for construction machinery. A stopper for preventing sliding of the engagement pin of the lock lever is provided on the upper portion of the guide cam formed upward from the notch-shaped engagement portion provided on the fixed frame, and the console box is placed in a posture for getting on and off. In addition, the gate lock lever alone in the vicinity of the console box is restricted from tilting forward, and a stopper for preventing the gate lock lever or the link plate from moving near the pivot axis of the gate lock lever of the console box is provided. 3. The gate lock device for a construction machine according to claim 1 or 2 , wherein the rear tilt of the gate lock lever alone in the use posture position and the vicinity thereof is limited . 4. The gate lock device for a construction machine according to claim 3, wherein the guide cam provided on the fixed frame has an arcuate outer peripheral surface centering on the pivot axis of the console box .

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