JP2017145598A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle having a release operation part, which prevents clothing of an operator from getting stuck with the release operation part when the operator gets on or off the vehicle despite being disposed at a lower part of a rear face of a front door with a front face facing forward in an open position at indoor upper part.SOLUTION: A lower lock release device 310 releases locks by actuating rock operation parts of a lock operation device for closing 210 and a lock operation device for opening 230 installed at an upper part of a front door 100. The lower lock release device is installed on a lower part of a rear face of the front door 100. A part exposing to indoor side of a control lever 313 of the lower lock release device 310 is formed of an operation body 315. The operation body 315 is formed into a rounded shape.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a working vehicle provided with a mechanism for locking a door of a cab.

  As an example of a working vehicle, there is known a skid steer loader in which traveling devices made of tires or crawlers are provided on the left and right sides of a vehicle body, and the traveling direction is changed by changing the operating speeds of the left and right traveling devices. Such a skid steer loader is provided with an arm that can swing up and down in the vehicle body, and by swinging the arm up and down, an attachment (working device) that is detachably attached to the tip of the arm is moved up and down. It is configured to do work.

  Also, as such a working vehicle, the front door that opens and closes the entrance / exit opened at the front of the cab is closed at the front-facing posture and closes the entrance / exit at the front of the room There is known one that is provided so as to be movable up and down between an open position where the doorway is opened. Furthermore, there is provided a lock operating part for holding such a front door so as not to move unexpectedly in the closed position and the open position, and a lock releasing device for operating the lock operating part from a remote position to release the lock. The thing provided is also known (for example, refer the following patent document 1).

Japanese Patent No. 5275281

  In the above-described lock release device, the release operation unit that is operated by the operator when releasing the lock is disposed at the lower part of the rear surface (inner side surface) of the front door. However, since this release operation part is formed in an elongated plate-like portion that is exposed to the indoor side, when the operator gets on and off, the worker's clothes and the string-like member worn on the operator are caught. There is a problem that it is easy. If clothes or the like are caught on the release operation section, there is a possibility that the passenger cannot get on and off smoothly or may be unlocked unexpectedly.

  The present invention has been made in view of such a problem, and when the operator gets on and off the vehicle while being placed at the lower part of the rear surface of the front door located in the upper part of the room with the front facing upward in the open position. It is an object of the present invention to provide a work vehicle including a release operation unit having a configuration in which the clothes and the like are not easily caught.

In order to achieve the above object, a working vehicle according to the present invention (for example, the crawler loader 1 in the embodiment) opens and closes an entrance / exit that is opened on the front surface of a cab (for example, the operator cabin 11 in the embodiment). Therefore, a front door that moves up and down between a closed position that closes the entrance / exit in a front-facing posture and an open position that is located in the upper part of the room and opens the entrance / exit in a front-facing posture, A lock actuating part (for example, holding the front door in the closed position or the open position by engaging with a locking part on the indoor side (for example, the striker 171 when closed, the striker 173 when opened) in the indoor side. In the embodiment, the closed lock operating device 210 of the closed lock operating unit, the open lock operating device 230 of the open lock operating device 230, and the lock operating unit are operated. Unlocking means for releasing the lock (for example, the lower lock releasing device 310 in the embodiment). The unlocking operation part (for example, the lower unlocking operation part in the embodiment) that releases the lock is operated, and the part exposed to the indoor side of the releasing operation part (for example, the operating body 315 of the operation lever 313 in the embodiment) ) Is formed in a rounded shape.

  In the work vehicle having the above-described configuration, a bar-shaped protection member (for example, the protection bar 180 in the embodiment) that extends along the front door in the vicinity of the indoor side of the release operation unit is installed at the lower rear portion of the front door. Is preferred.

  Further, the protection member includes a grip part (for example, a left hand grip part 182L in the embodiment) that can be gripped by an operator with one hand when operating the release operation part. It is preferable that the operation unit is configured to be operable with the thumb of one hand in a state where an operator puts one hand on the holding unit and holds it.

  According to the working vehicle according to the present invention configured as described above, the portion exposed to the indoor side of the release operation portion operated by the operator when unlocking is formed in a rounded shape. Therefore, when an operator gets on and off, the operator's clothes (for example, cuffs, collars, helmet and hat collars) and string-like members worn (for example, straps and helmet jaws) It is difficult to get caught in the release operation section. Therefore, it is possible to prevent a situation in which the entry / exit cannot be performed smoothly or the lock is unexpectedly released because clothes or the like are caught on the release operation unit.

  In the working vehicle having the above configuration, if a bar-shaped protective member extending along the front door is installed in the lower rear portion of the front door along the front door, clothing or the like is placed on the release operation unit. Since it can prevent also by a protection member, it becomes possible to improve the prevention function of a catch. Further, when the worker gets on and off, the protective member can prevent the belongings or helmet of the worker from colliding with the release operation unit and being damaged.

  In addition, the protective member has a gripping part that can be held with one hand by an operator when operating the release operation part, and the release operation part is held in a state where the operator holds the gripping part with one hand. If it is configured to be operable with the thumb of the hand, the unlocking operation unit can be easily operated with one hand to perform unlocking. In addition, after unlocking, the front door can be opened and closed while the operator holds the grip (protective member) with one hand, so the operation from unlocking the front door to opening and closing is smooth. It is also possible to do this.

It is a left view of the crawler type skid steer loader to which the present invention is applied. It is a front view of the said skid steer loader. It is a whole perspective view of the front side of the front door installed in the skid steer loader. It is the whole rear perspective view of the said front door, and an expansion perspective view of the lower lock release apparatus of the lock release mechanism installed in the said rear surface side. It is sectional drawing which cut | disconnected the operator cabin of the said skid steer loader in the front-back and up-down directions, and was seen from the left side surface side. It is sectional drawing which cut | disconnected the said operator cabin in the left-right up-down direction, and was seen from the rear surface side. It is a left view which shows the intermediate part lock release apparatus of the said lock release mechanism. It is an external appearance perspective view which shows the emergency unlocking operation part of the said unlocking mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, an example in which the present invention is applied to a crawler skid steer loader (hereinafter referred to as a crawler loader) in which a bucket is attached to the tip of an arm will be described. First, the overall configuration of the crawler loader 1 will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the crawler loader 1 includes a pair of left and right traveling devices 5 each having an endless crawler belt 3, a main body frame 9 to which the traveling devices 5 are attached to the left and right, A loader device 20 attached to the frame 9 and a cab (operator cabin 11) provided at the upper center of the main body frame 9 are configured. The traveling devices 5 and 5 and the main body frame 9 are hereinafter collectively referred to as “vehicle 10”.

  The loader device 20 includes an arm 21 disposed so as to surround the front, rear, left and right of the operator cabin 11, a pair of left and right control links 22 attached across the main body frame 9 and the arm 21, and a rear side of the control link 22. A pair of left and right arm cylinders 23 attached across the main body frame 9 and the arm 21 are provided. In addition, a pair of left and right lift links 24 mounted across the main body frame 9 and the arm 21 on the rear side of the arm cylinder 23, a bracket 29a pivotally connected to the tip of the arm 21 so as to swing up and down, A bucket 29 detachably attached via a bracket 29a is also provided. The pair of left and right control links 22, the arm cylinder 23 and the lift link 24 are provided symmetrically, and the arm 21 is attached to the main body frame 9 via the control link 22, the arm cylinder 23 and the lift link 24. .

  The operator cabin 11 is formed in a box shape, and an operator seat (not shown) on which an operator sits facing the front (front side of the vehicle) is provided inside (inside the room). Operation levers (not shown) for operating the drive of the traveling device 5 and the loader device 20 are disposed on the left and right sides of the operator seat. The crawler loader 1 is placed on the operator seat by the operator. By operating the operation lever, the vehicle 10 can be run or the arm 21 or the bucket 29 can be moved. Specifically, according to the operation of the operation lever, the traveling device 5 is driven to move the vehicle 10, the arm cylinder 23 is expanded and contracted to swing the arm 21 up and down, and the bucket cylinder 28 is moved. The bucket 29 can be swung up and down by extending and contracting.

  On the front side of the operator cabin 11 (front side of the vehicle), an entrance 12 is provided for an operator to enter and exit the operator cabin 11, and the front door 100 that can be opened and closed (simply shown in FIG. 2). Are shown). Hereinafter, the configuration of the front door 100 will be described with reference to FIGS.

  As shown in FIGS. 3 and 4, the front door 100 is made of a transparent door window plate 110 made of glass or resin, and a metal installed on each edge of the rear surface (interior side surface) of the front door 100. Frame (upper edge frame 112U installed at the upper edge of the rear surface, left edge frame 112L installed at the left edge, right edge frame 112R installed at the right edge) and the lower edge In addition, a weather strip 113 for preventing intrusion of rubber raindrops and the like is mainly used. As shown in FIG. 3, a wiper device 114 for wiping off dirt and the like adhering to the door window plate 110 and an upper front portion of the door window plate 110 are fixed to the front surface (outdoor surface) side of the front door 100. A front upper handle 116 and a front lower handle 118 fixed to the lower front surface of the door window plate 110 are provided.

On the other hand, on the rear surface side of the front door 100, as shown in FIG. 4, a wiper driving device 120 incorporating a motor or the like for driving the wiper device 114, and a rear upper handle fixed to the upper rear surface of the door window plate 110. 122, a rear left edge handle 124 fixed to the vertical center portion of the left edge frame 112L, and a rear right edge handle 126 fixed to the vertical center portion of the right edge frame 112R. In addition, guide rollers 128LU and 128LD are rotatably supported at two positions on the left edge of the rear surface of the front door 100, and guide rollers 128RU are disposed at two positions on the right edge of the rear surface of the front door 100. , 128RD are rotatably supported.

  With respect to the front door 100 configured in this manner, on the right side of the operator cabin 11 in the room, as shown in FIG. 5, the upper right guide rail extends while slightly curving from the front of the room to the rear along the ceiling. 160RU and a lower right guide rail 160RD that extends in the vertical direction along the right edge of the entrance 12 and has a part on the upper end side bent backward are installed. Similarly, an upper left guide rail 160LU and a lower left guide rail 160LD are installed on the left side of the operator cabin 11 so as to face the upper right guide rail 160RU and the lower right guide rail 160RD symmetrically (FIG. 6). See).

  The front door 100 is such that the guide rollers 128LU and 128LD are guided by the upper left guide rail 160LU and the lower left guide rail 160LD, respectively, and the guide rollers 128RU and 128RD are guided by the upper right guide rail 160RU and the lower right guide rail 160RD. By being attached to each guide rail so as to be guided, it is supported on the operator cabin 11 side so as to be freely opened and closed. Specifically, as shown in FIG. 5, the front door 100 is located at the upper part of the room in a closed position in which the entrance 12 is closed in a front-facing posture, and in a posture in which the front-facing side is tilted backward, and the entrance 12 is opened. It is supported so that it can move up and down between the open positions. When moving from the closed position to the open position, the upper side of the front door 100 moves along the ceiling portion of the operator cabin 11 while the entire front door 100 falls down, and in the open position, The whole 100 is configured to fit in the operator cabin 11 along the ceiling. In FIG. 5, the front door 100 in the closed position is the front door 100D, the front door 100 in the open position is the front door 100U, and both are shown by solid lines. Further, gas cylinders 162L and 162R are installed between the front door 100 and the operator cabin 11 to assist the operation when opening and closing (mainly opening) the front door 100 (gas cylinders 162L and 162R). Are supported by support plates 130L and 130R installed on the rear surface of the front door 100, and lower ends of the gas cylinders 162L and 162R are supported by support plates 164L and 164R installed on the left and right side surfaces of the operator cabin 11. Have been).

  Further, as shown in FIG. 4, a manual lock mechanism 165 is provided on the upper left part of the rear surface of the front door 100. The manual lock mechanism 165 is manually operated by an operator to restrict the movement of the front door 100 that has moved to the open position, and includes a cylindrical case 166 fixed to the upper end of the left edge frame 112L. A cylinder 167 accommodated and held in the case 167 and an operation lever 168 attached to the cylinder 167 are provided. Further, the cylinder 167 is movable in the left-right direction between an advancing position where the front end portion protrudes greatly from the left end side of the case 166 and a retracted position where the protruding amount becomes small. The manual lock mechanism 165 moves the cylinder 167 to the advanced position when the front door 100 moves to the open position, thereby allowing the cylinder 167 to move into a cylinder locking recess (not shown) provided on the indoor side. A front-end | tip part approachs and the movement of the front door 100 can be controlled. Further, the movement restriction of the front door 100 can be released by moving the cylinder 167 to the retracted position and retracting the tip of the cylinder 167 from the cylinder locking recess.

  Further, as shown in FIG. 4, the front door 100 includes an automatic lock mechanism 200 for automatically holding the front door 100 in the closed position and the open position, and a lock for releasing the lock by the automatic lock mechanism 200. And an unlock mechanism 300. Hereinafter, the automatic lock mechanism 200 and the lock release mechanism 300 will be described with reference to FIGS.

  As shown in FIG. 4, the automatic lock mechanism 200 is installed at the upper left and right central portions of the front door 100, and includes a closed lock actuator 210 and an open lock actuator 230 disposed adjacent thereto. Are provided separately. In FIG. 4 and the like, a part of the automatic lock mechanism 200 (the lock operation device 210 when closed, the lock operation device 230 when opened) is covered with an upper edge cover 132 installed on the upper rear surface of the front door 100. Hiding.

  The closing lock actuating device 210 is for automatically locking the front door 100 moved to the closed position and restricting (holding) the movement, and includes a support plate 211 fixed to the upper edge frame 112U, The protection cover 213 fixed to the support plate and the closed-time lock operating portion supported by the support plate 211 and partially covered by the protection cover 213 are mainly configured. The protective cover 213 is formed with a striker entry groove 213a that opens forward and into which a striker 171 when closed (see FIG. 6) installed at the top of the entrance 12 can enter. In addition, a part of the lock actuating portion when closed is arranged to face the outside. The closing lock actuating portion is configured to be detachably engaged with the closing striker 171. Specifically, the lock operation unit at the time of closing engages with the striker 171 at the time of closing to hold the front door 100 so that it cannot move from the closed position, and the front door 100 is detached from the striker 171 at the time of closing. It is comprised so that the engagement disengagement state which can be moved from a closed position can be taken.

  The opening lock actuating device 230 is for automatically locking the front door 100 that has moved to the open position and restricting its movement. The support plate 231 fixed to the upper edge frame 112U, and the support plate The protective cover 233 is fixed to the main body, and the unlocking operation portion that is supported by the support plate 231 and partially covered by the protective cover 233 is mainly configured. The protective cover 233 is formed with a striker entry groove 233a that is open upward and into which an open striker 173 (see FIG. 5) installed at the rear of the ceiling of the operator cabin 11 can enter, and this striker entry groove 233a. Inside, a part of the lock actuating portion when opened is arranged so as to face the outside. The unlocking operation portion is configured to be detachably engaged with the opening striker 173. Specifically, the unlocking operation portion engages with the opening striker 173 to hold the front door 100 so that it cannot be moved from the opening position, and is disengaged from the opening striker 173 to release the front door 100. It is comprised so that the disengagement state which can be moved from an open position can be taken.

  On the other hand, as shown in FIG. 4, the lock release mechanism 300 includes a lower lock release device 310 installed at a position slightly to the left of the rear surface of the front door 100, the lower lock release device 310, and the above-described lock operation device when closed. 210 and the unlocking lock actuating device 230, the intermediate force unlocking device 360 installed in the middle of the operating force transmitting route portion 330, and the closing lock actuating device 210. It is mainly composed of an emergency unlocking operation unit 380 installed in the vicinity of the lower part.

The lower lock release device 310 includes a cover body 311 and a lower lock release operation portion accommodated in the cover body 311, and the lower lock release operation portion is formed on the left side surface of the cover body 311. The operation lever 313 is provided so as to protrude from the groove 311a to the indoor side. The operation lever 313 includes a metal lever body and a resin operation body 315 fixed to the tip of the lever body. The operation body 315 is formed in a semi-elliptical shape (a shape in which a cylindrical part and a hemispherical part are combined) that is rounded as a whole, and the operation lever 313 is a part of the operation body 315. It is comprised so that only may be exposed to the indoor side. Further, there is almost no gap between the operation body 315 and the cover body 311. A bolt insertion recess 315a for fixing the operation body 315 to the tip of the lever body is formed at the top of the operation body 315.
R edge chamfering is given to the peripheral part of 5a.

  Further, the operation lever 313 has a substantially vertical posture with respect to the door window plate 110 (the top of the operation body 315 faces rearward) and a substantially parallel posture with respect to the door window plate 110 (operation). The body 315 is configured to be swingable between the release operation position (the top of the body 315 is directed to the left). The lower lock release device 310 configured as described above is configured such that when the operator operates the operation lever 313 from the normal position to the release operation position, the above-described closing lock operation unit via the operation force transmission path unit 330. It is possible to operate both the unlocking operation portion and the unlocking operation portion so as to be in the disengaged state. In addition, this makes it possible to unlock the front door 100 held (locked) in the closed position or the open position from a remote position. The operation lever 313 operated to the release operation position returns to the normal position when the operator releases his / her hand, but the disengagement state of the lock operation portion when closed and the lock operation portion when opened is as follows. To be maintained.

  Further, a protective bar 180 extending in the left-right direction along the front door 100 in the vicinity of the indoor side of the lower lock release device 310 is installed at the lower rear surface of the front door 100. The left and right ends of the protection bar 180 are fixed to the left edge frame 112L and the right edge frame 112R, respectively, so that the protective bar 180 functions as a handle that an operator puts on when opening and closing the front door 100. . Specifically, in the middle portion in the left-right direction of the protection bar 180, a vertically inclined portion is formed symmetrically, and the left-side inclined portion of the left-hand holding portion 182L on which the operator's left hand is placed. The right inclined portion is configured as a right hand grip 182R on which the operator's right hand is put. The operation lever 313 of the lower lock release device 310 is moved from the normal position to the release operation position by bringing the thumb of the left hand into contact with the operation body 315 while the operator puts his left hand on the left hand grip 182L. It is configured to be operable up to.

  Furthermore, the lower lock release operation unit of the lower lock release device 310 is configured to be operable from the outside when the front door 100 is in the closed position. Specifically, the lower front handle 118 described above is installed on the opposite side (external side) of the lower lock release device 310 across the door window plate 110, as shown in FIG. 118 is provided with a cylinder-shaped unlocking operation button 119. This unlocking operation button 119 operates the operation lever 313 of the lower unlocking device 310 from the normal position to the unlocking operation position when the operator puts his right hand on the front lower handle 118 and pushes it with the thumb of the right hand. It is configured to be possible. Further, the unlock operation button 119 can be locked and cannot be operated.

  As shown in FIG. 7, the intermediate part unlocking device 360 includes a cover body 361 and an intermediate part unlocking operation part accommodated in the cover body 361. The operation lever 363 is disposed so as to protrude from the groove formed on the front surface of the cover body 361 to the front side on the indoor side (the door window plate 110 side). The rear right edge handle 126 is disposed so as to penetrate the cover body 361, and the cover body 361 and the intermediate part unlocking operation portion are supported by the rear right edge handle 126.

The operation lever 363 can swing between a normal position where the tip of the operation lever 363 is inclined with respect to the door window plate 110 and a release operation position where the operation lever 363 is substantially parallel to the door window plate 110. It is configured. When the operator operates the operation lever 363 from the normal position to the release operation position, the intermediate part lock release device 360 is operated via the operation force transmission path part 330 and the lock operation part when closed and the lock operation when opened. Both of the parts can be operated so as to be in the disengaged state. In addition, this makes it possible to unlock the front door 100 held (locked) in the closed position or the open position from a remote position. The operation lever 363 operated to the release operation position returns to the normal position when the operator releases the hand. However, the disengagement state between the lock operation unit when closed and the lock operation unit when opened is as follows. To be maintained.

  As shown in FIG. 4, the operating force transmission path portion 330 includes a first Bowden wire 331 disposed between the lower lock release device 310 and the intermediate portion lock release device 360, an intermediate portion lock release device 360, and A second Bowden wire 333 disposed between the upper edge cover 132 and an unlocking link mechanism disposed in the upper edge cover 132 is configured. Further, by these components, an operating force is applied from the lower lock release operation unit of the lower lock release device 310 to the closed lock operation unit of the closed lock operation device 210 and the open lock operation unit of the open lock operation device 230. The first operating force transmission path portion and the second operating force transmission path portion that respectively transmit the above are configured.

  The first Bowden wire 331 connects the lower lock release operation portion of the lower lock release device 310 and the intermediate portion lock release operation portion of the intermediate portion lock release device 360 to the operation lever 313 of the lower lock release operation portion. The applied operation force is configured to be transmitted to the intermediate part unlocking operation unit. The second Bowden wire 333 connects the intermediate part unlocking operation part and the unlocking link mechanism, and is transmitted from the lower unlocking operation part to the intermediate part unlocking operation part via the first Bowden wire 331. The operation force applied to the operation lever 363 of the intermediate part unlocking operation part is transmitted to the unlocking link mechanism. In addition, the unlocking link mechanism branches the operating force transmitted through the second Bowden wire 333 into two, and transmits one to the lock operating part of the lock operating device 210 when closed, and opens the other. The hour lock actuating device 230 is configured to be transmitted to the lock actuating portion when opened.

  As shown in FIG. 8, the emergency unlocking operation unit 380 includes an operation lever 383 arranged so as to protrude downward from the groove 132 a formed on the lower surface of the upper edge cover 132. The operation lever 383 is formed in a shape (L-shape) in which a tip portion of a portion protruding to the indoor side is bent at a right angle toward the door window plate 110, and is normally inclined with respect to the vertical direction. It is configured to be able to swing between a position and a release operation position that is substantially parallel to the vertical direction. The emergency unlocking operation unit 380 is operated when the operator operates the operation lever 383 from the normal position to the unlocking operation position, and directly when the unlocking device 210 is closed without closing the operation force transmission path unit 330. It is possible to operate the lock operating unit so as to be in the disengaged state. In addition, this makes it possible to directly unlock the front door 100 held (locked) in the closed position.

  Next, the operation when opening and closing the front door 100 configured as described above will be described. When in the closed position, the front door 100 is automatically locked by the lock operation device 210 when closed (the lock operation portion when closed is automatically engaged with the striker 171 when closed and is in an engagement holding state. ) In order to release this lock from the indoor side, the lower lock release device 310 is usually used. When using the lower lock release device 310, an operator can perform a lock release operation by placing a hand on the protection bar 180. Specifically, the operator can operate the operation lever 313 from the normal position to the release operation position with the left hand thumb while the operator puts his left hand on the left hand grip 182L. As a result, the lock operation unit at the time of closing of the lock operation device 210 at the time of closing is operated so as to be in the disengagement state, and the lock can be released. Further, after this, the worker puts his left hand on the left hand gripping part 182L (at this time, the worker may further put his right hand on the right hand gripping part 182R) with respect to the front door 100. The operator can move the front door 100 toward the open position by applying a force that moves the front door 100 backward while falling down (hereinafter referred to as “opening operation”).

  When the front door 100 is in the closed position, the lock can be released by the lock operation device 210 when closed, even if the intermediate portion lock release device 360 is used. For example, it can be used when the lower lock release device 310 or the first Bowden wire 331 is defective and cannot be unlocked by the lower lock release device 310. When the intermediate part unlocking device 360 is used, the operator can operate the operation lever 363 with the middle finger or the like of the right hand while the operator puts the right hand on the cover body 361. By operating the operation lever 363 from the normal position to the release operation position, the lock operation unit at the time of closing of the lock operation device 210 at the time of closing can be operated so as to be in the disengaged state, and the lock can be released. After unlocking, the operator puts his right hand on the cover body 361 or the rear right edge handle 126 and further opens the front door 100 with his left hand on the rear left edge handle 124. The front door 100 can be moved toward the open position. Of course, the operator may use the protection bar 180 when the front door 100 is opened.

  When the front door 100 is in the closed position, the lock release device 210 can be unlocked by operating the emergency unlock operation unit 380. For example, when the lower lock release device 310, the first Bowden wire 331, the intermediate portion lock release device 360, the second Bowden wire 333, the lock release link mechanism, or the like malfunctions, the lower lock release device 310 or the intermediate portion lock release It can be used as an emergency when the device 360 cannot be unlocked. The emergency unlocking operation unit 380 locks the lock operating device 210 in the closed state when the operator places the finger of the left hand or the right hand on the operation lever 383 and operates the operation lever 383 from the normal position to the release operation position. The operating part can be operated so as to be in the disengaged state and unlocked. After unlocking, the operator puts both hands on the protective bar 180 or on the rear left edge handle 124 and the rear right edge handle 126, and opens the front door 100 to bring the front door 100 to the open position. Can be moved.

  When the front door 100 is moved toward the open position, the front door 100 is automatically locked by the lock operation device 230 at the open position (the lock operation unit at the open time automatically engages with the striker 173 at the open time). To be in an engagement holding state). In order to release this lock from the indoor side, the lower lock release device 310 is usually used. The operation method of the operation lever 313 when using the lower lock release device 310 is the same as that in the case of unlocking in the closed position described above. It can be operated so as to be in a disengaged state and unlocked. After unlocking, by applying a force to move the front door 100 forward (hereinafter referred to as “closing operation”) to the front door 100 with the operator holding the protection bar 180 in hand. The front door 100 can be moved toward the closed position.

  When the front door 100 is in the open position, the unlocking operation by the unlocking lock actuating device 230 may use the intermediate portion unlocking device 360. The operation method of the operation lever 363 when the intermediate part lock release device 360 is used is the same as that in the case of unlocking in the above-mentioned closed position. Can be operated to be in the disengaged state and unlocked. After unlocking, the operator puts his hand on the rear right edge handle 126 and the rear left edge handle 124 or the protection bar 180 and closes the front door 100, so that the lock operation part at the time of closing is released from the striker 173 at the time of opening. The front door 100 can be moved toward the closed position.

As described above, in the crawler loader 1, the portion exposed to the indoor side of the operation lever 313 (the operation body 315) in the lower lock release device 310 is formed in a rounded shape. In addition, the operator's clothes (for example, cuffs, collars, helmets and hats) and string-like members worn (for example, straps and chin straps of helmets) are difficult to be caught by the operation lever 313. . Therefore, it is possible to prevent a situation in which getting on and off cannot be performed smoothly or the lock is unexpectedly released because clothes or the like are caught on the operation lever 313.

  In addition, since the protective bar 180 extending along the front door 100 is installed in the vicinity of the lower lock release device 310 in the room, the protective bar 180 can also prevent the clothes from being caught on the operation lever 313. it can. Further, when the worker gets on and off, the protective bar 180 can prevent the worker's belongings or helmet from colliding with the release operation unit and being damaged. In addition, the protection bar 180 is provided with a left hand grip 182L that can be held by an operator with the left hand when operating the operation lever 313. The operation lever 313 is provided with a left hand grip. The operation lever 313 can be operated with the thumb of the left hand while the left hand is put on the part 182. For this reason, the operation lever 313 can be easily operated with the left hand to release the lock. Furthermore, since the front door 100 can be opened and closed while the operator holds the left hand gripping part 182 with the left hand after unlocking, the operation from unlocking the front door 100 to opening and closing is smoothly performed. It is also possible to do this.

  Furthermore, the crawler loader 1 is operated by an operator separately from the lower lock release device 310 and the intermediate portion lock release device 360 that release the lock by operating the lock operation unit when closed via the operation force transmission path unit 300. Thus, an emergency lock release operation unit 380 is provided to release the lock by directly operating the lock operation unit. For this reason, even if a malfunction occurs in the operating force transmission path section 300, the lock operation section at the time of closing can be operated and unlocked by the emergency unlock operation section 380, so that the door window plate 110 of the front door 100 can be removed. The front door 100 unlocked by the emergency unlocking operation unit 380 can be opened and the entrance 12 can be opened without breaking or opening an emergency escape opening (for example, provided on the rear surface of the operator cabin 11). It is possible for an operator to go out of the room.

  Further, the crawler loader 1 is provided with a closed lock operation portion that holds the front door 100 in the closed position and an open lock operation portion that holds the front door 100 in the open position. For this reason, compared with what comprised these two lock | rock action | operation parts in common, the frequency | count of operation | movement of each lock | rock action | operation part (especially the frequency | count of operation at the time of engaging with the latching | locking parts 171 and 173) should be reduced to about half. Therefore, it is possible to make it difficult for problems to occur in each lock operating portion.

  In the operation force transmission path section 330, the first operation force transmission path section and the second operation force transmission path section are formed by the first Bowden wire 331, the second Bowden wire 333, and the lock release link mechanism. Among them, from the lower part unlocking operation part to the middle part unlocking operation part is shared by the first Bowden wire 331, and from the middle part unlocking operation part to the unlocking link mechanism is the second. Commonized by a Bowden wire 333. For this reason, it becomes possible to simplify the configuration of the operating force transmission path portion 330 as compared to the configuration in which the two operating force transmission path portions are configured separately over the entire path.

Further, the crawler loader 1 includes an intermediate part unlocking device 360 in the middle of the path of the operating force transmission path unit 330 in addition to the lower lock releasing device 310. For this reason, even if a malfunction occurs in the lower lock release device 310 and the first Bowden wire 331, the lock release unit at the time of closing and the lock operation unit at the time of release can be operated by the intermediate part lock release device 360 to release the lock. Further, unlocking of the front door 100 in the closed position is performed by the lower unlocking device 310, and unlocking of the lower door unlocking device 310 in the opened position is performed by the intermediate portion unlocking device 360 (or vice versa). As described above, the two unlocking devices 310 and 360 can be used properly according to the posture of the worker, ease of operation, and the like.

  The embodiments of the present invention have been described so far, but the scope of the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the lower lock release device 310 is used as a lock release device that releases the lock by operating the lock operation unit at the time of closing and the lock operation unit at the time of opening from the distant position via the operation force transmission path unit 300. Although the two intermediate part unlocking devices 360 are provided, it may be configured to include only one of them. Further, a portion exposed to the room side of the operation lever 363 of the intermediate portion lock release device 360 may be formed in a rounded shape. Moreover, it is good also as a structure which makes a lock action | operation part at the time of closing and a lock action | operation part at the time of opening | release common, and makes one lock action part. Furthermore, you may comprise separately two operation force transmission path parts (1st and 2nd operation force transmission path part) over all the paths. In addition, the operation lever 313 of the lower lock release device 310 may be configured so that the operator can operate it with the thumb of the right hand in a state where the operator puts his right hand on the right hand grip 182R of the protection bar 180. Moreover, although the case where this invention was applied to the crawler loader 1 was demonstrated in the above-mentioned embodiment, this invention may be applied to other working vehicles other than the crawler loader, for example, a power shovel. it can.

1 Crawler loader (work vehicle)
11 Operator cabin (cab)
12 Entrance / exit 100 Front door 171 Closed striker 173 Opened striker 180 Protective bar 182L Left hand gripping part 182R Right hand gripping part 200 Automatic locking mechanism 210 Closing lock actuating device 230 Opening lock actuating device 300 Unlocking mechanism 310 Lower lock Release device 313 Operation lever 315 (for lower lock release device) Operation body 330 Operation force transmission path portion 360 Intermediate portion lock release device 363 Operation lever 380 (for intermediate portion lock release device) Emergency lock release operation portion

Claims (3)

To open and close the entrance / exit opened at the front of the operator's cab, a closed position that closes the entrance / exit in a front-facing posture and an opening that opens at the top of the room in a front-facing posture and opens the entrance / exit A front door that moves up and down between positions,
A lock actuating portion that is provided at an upper portion of the front door and holds the front door in the closed position or the open position by engaging with a locking portion on the indoor side;
Unlocking means for unlocking by operating the lock actuating part, and
The unlocking means is
Provided at the lower rear surface of the front door, and has a release operation part for operating the lock operation part to be unlocked by being operated by an operator,
A working vehicle characterized in that a portion exposed to the indoor side of the release operation portion is formed in a rounded shape.   The work vehicle according to claim 1, wherein a bar-shaped protection member extending along the front door in the vicinity of the indoor side of the release operation unit is installed at a lower rear surface of the front door. The protective member includes a gripping part that an operator can hold with one hand when operating the release operation part,
The work vehicle according to claim 2, wherein the release operation unit is configured to be operated by a thumb of the one hand in a state where an operator puts one hand on the grip unit and grips the release unit.

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