Abstract:
A cabin door device having a cabin frame, comprises: a door mounted to a side part of the cabin frame so as to be moveable between a fully closed position and a fully open position; and a main striker supported by the cabin frame, wherein the door has a lock device, and the door is held in the fully closed position by the lock device engaging the striker; and an auxiliary striker that is supported by the cabin frame and whose position can be changed between a held posture, in which the door is held at an intermediate position between the fully closed position and the fully open position by coupling with the lock device, and a retracted position in which the lock device of the door is allowed to engage with the striker.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a cabin door device to be mounted to a work vehicle or other vehicle. 
     2. Description of the Related Art 
     Prior art such as that disclosed in JP 3108182 and JP 3177081 is known in which an auxiliary striker changes to a held position in a lateral direction and links with a lock device to create a state in which a door is slightly open; and air within a cabin can be discharged or outside air can be brought into the cabin. 
     In a conventional cabin door device disclosed in JP 3108182, an auxiliary striker is caused to rotate about 270°, whereby the auxiliary striker can be switched to a held position and a retracted posture. In a conventional cabin door device disclosed in JP 3177081, an auxiliary striker is caused to rotate about 180°, whereby the auxiliary striker can be switched to a held posture and a retracted posture. 
     When the auxiliary striker is rotated or pivoted in a wide range of angles when the auxiliary strikers are thus switched to the held posture and the retracted posture, a wide space must be provided to allow the auxiliary striker to rotate or pivot. For this reason, problems arise in that, e.g., the arrangement of equipment in the cabin will be limited, and in that, when luggage or the like is placed in a position where the auxiliary striker rotates or pivots, the position of the auxiliary striker cannot be changed, and the ability to operate the auxiliary striker is impaired. 
     SUMMARY OF THE INVENTION 
     The object of the invention is to solve or alleviate some of the problems in the conventional device. 
     A cabin door device having a cabin frame, comprising:
         a door mounted to a side part of the cabin frame so as to be moveable between a fully closed position and a fully open position; and   a striker supported by the cabin frame, wherein the door has a lock device, and the door is held in the fully closed position by the lock device engaging the striker; and   an auxiliary striker that is supported by the cabin frame and whose position can be changed between a held posture, in which the door is held at an intermediate position between the fully closed position and the fully open position by coupling with the lock device, and a retracted position, which is displaced toward an interior of the cabin and in which the lock device of the door is allowed to engage with the striker; wherein the auxiliary striker is pivotable about an axis in a fore and aft direction.       

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a left side view of the entirety of a utility vehicle; 
         FIG. 2  is a plan view of the entirety of the utility vehicle; 
         FIG. 3  is a plan view of the utility vehicle in a state in which a door is slightly open; 
         FIG. 4  is a left side view in a state in which a front glass and a rear glass are slightly open; 
         FIG. 5  is a lateral cross-sectional plan view showing a structure of an auxiliary striker; 
         FIG. 6  is a front view showing the structure of the auxiliary striker; 
         FIG. 7  is a side view of the auxiliary striker as seen from an inner side; 
         FIG. 8  is a longitudinal cross-sectional side view of a mounting part of the auxiliary striker; 
         FIG. 9  is a left side view of the entirety of a utility vehicle according to another embodiment; 
         FIG. 10  is a plan view of the entirety of the utility vehicle according to the other embodiment; 
         FIG. 11  is a side view of a left door according to the other embodiment as seen from outside; 
         FIG. 12  is a side view of the left door according to the other embodiment as seen from inside; 
         FIG. 13  is a cross-sectional view showing a structure of the door along a XIII-XIII line of  FIG. 11 ; and 
         FIG. 14  is a cross-sectional view showing the structure of the door along a XIV-XIV line of  FIG. 11 . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Preferred embodiments of the present invention shall be described below with reference to the accompanying drawings. A plurality of embodiments shall be described. However, combinations of characteristics disclosed in the specified embodiments and characteristics disclosed in the other embodiments are included within the scope of the present invention. 
     (Overall Structure of Utility Vehicle) 
       FIG. 1  shows a side view of the entirety of a utility vehicle that is an example of a work vehicle; and  FIG. 2  shows a plan view of the entirety of the utility vehicle. In the utility vehicle, a motive force from an engine  2  supported by a vehicle body frame  1  in a vibration-proof state is transmitted to left and right pairs of front wheels  5  and rear wheels  6  via a gear-type transmission device  4  and a hydrostatic stepless transmission device  3  and the like, whereby a four-wheel drive is driven. A plan view of the utility vehicle in a state in which a door  33  is slightly open is shown in  FIG. 3 ; and a left side view of a state in which a front glass  26  and a rear glass  27  are slightly open is shown in  FIG. 4 . 
     As shown in  FIGS. 1 and 2 , a lower cover  7  for a front wheel fender, an upper cover  8  having an opening in a lateral central part of an upper part, a pivoting opening and closing hood  9  for openably and closeably covering the opening, and the like are disposed on a front part of the multi-purpose vehicle. 
     A cabin  14  in which are provided a steering wheel  11  for steering the front wheels, an operator&#39;s seat  12 , and the like is provided to a longitudinally central part of the utility vehicle. The cabin  14  forms an occupant space. 
     A hydraulic dump cylinder  15  is disposed above the gear-type transmission device  4  at the rear part of the utility vehicle. The dump cylinder  15  is extended and contracted, whereby a loading platform  17  is dumped in the vertical direction using a lateral support shaft  16  provided as a support point at a rear end part of the vehicle body frame  1 . 
     The vehicle body frame  1  comprises a cabin frame  20  that forms the occupant space, a front part frame  18  and rear part frame  19  extending from the cabin frame  20  in the fore and aft direction, and the like. The various frames (e.g.,  18 ,  19 ,  20 ) constituting the vehicle body frame  1  are securely welded together. 
     The cabin frame  20  comprises a left and right pair of door frames  21  that form a boarding and disembarking portal, a plurality of cross members  22  provided extending between the left and right door frames  21 , a floor panel  23  for forming a floor for the occupant space, a support frame  24  for supporting the driver&#39;s seat  12 , a roof panel (not shown) that is positioned at a ceiling portion of the occupant space and that is provided so as to extend between the left and right door frames  21 , and the like. A front surface side and rear surface side of the cabin frame  20  are covered by the openable and closable front glass  26  and the openable and closable rear glass  27 , respectively; and the top of the roof panel is covered by a resin outer roof  25 . 
     The front glass  26  is pivotably supported by hinges  28  disposed to the left and right of an upper end part of the front glass so that a lower side of the front glass  26  opens toward the exterior of the vehicle, as shown in  FIGS. 3 and 4 . A gas damper  29  is mounted to left and right end parts of the lower part of the front glass  26  so as to extend between the front glass  26  and the door frame  21 . When a lock handle  30  provided to the left and right side parts of the lower part of the front glass  26  is released, the front glass  26  is caused by a reactive force of the gas damper  29  to pivot in the fore and aft direction about the axis of the hinges  28 , the lower side of the front glass  26  is opened toward the exterior of the vehicle, and outside air can be brought in toward the driver&#39;s seat  12  from the front. 
     The rear glass  27  is pivotably supported by hinges  31  disposed to the left and right of an upper end part of the rear glass so that a lower side of the rear glass  27  opens toward the exterior of the vehicle. A folding stay  32  is mounted to left and right side parts of a lower part of the rear glass  27  so as to extend between the rear glass  27  and the cross member  22 . When a lock implement (not shown) provided to the stay  32  is released and the lower side of the rear glass  27  is pressed rearward from the inside, the rear glass  27  pivots in the fore and aft direction about an axis of the hinges  31 , and the lower side of the rear glass  27  is opened toward the exterior of the vehicle. When the lower part of the rear glass  27  is opened in a state in which the lower part of the front glass  26  is open, external air brought in toward the driver&#39;s seat  12  from the front crosses over the driver&#39;s seat  12  and is discharged from the lower part of the rear glass  27 . 
     Doors  33  are provided to both side parts of the cabin frame  20 . When an opening and closing handle  34  is operated from inside or outside of the driver&#39;s seat  12 , the outwardly opening left and right pair of doors  33  opens and closes in a single direction about an axis of hinges  35  disposed above and below front parts of the doors  33 . 
     The door  33  comprises a door main body  33   a  formed by press-molding an ABS resin plate and covering a surface thereof with an acrylic sheet, a reinforcing frame  33   b  composed of a square pipe-shaped steel tube that has been bent and molded into a loop shape, and a side glass  33   c  installed in the door main body  33   a . A sealing member  36  is fitted and installed in an outer peripheral part of the door main body  33   a  constituting the door  33  and then affixed to a door receiving part  21   a  of the door frames  21  in a state in which the door  33  is shut, whereby the door  33  can reliably be sealed. 
     The removable hinges  35  are anchored from the outside to the door main body  33   a  constituting the door  33 . The removable hinges  35  are fitted from above into a boss part  35   a  that is anchored to the door frames  21  in a state of having been anchored to the door main body  33   a , whereby the door  33  is mounted to the door frames  21  so as to be able to pivot open and closed. 
     An opening and closing handle  34  provided with a lock release button  34   a  is anchored to an outer surface of the door  33 , as shown in  FIGS. 4 and 7 . When the opening and closing handle  34  is gripped from the outside of the utility vehicle and the lock release button  34   a  is pressed, engagement with a lock pin  42  of the lock pawl  37   a  constituting a lock device  37  is released, and the door  33  can be opened. 
     A bracket  38  folded and formed on the inner side of the vehicle body is anchored to the reinforcing frame  33   b  (see  FIG. 5 ). The lockable lock device  37  is anchored to the bracket  38 . The door  33  is closed and the lock device  37  is engaged with the lock pin  42  or lock pin  47  anchored to the door frames  21 , whereby the door  33  can be held in a closed state or a state of being slightly opened. 
     The lock device  37  comprises an upper and lower pair of lock pawls  37   a , a case  37   b , a lock release implement  37   c , and the like. The upper and lower pair of lock pawls  37   a  is urged by a spring (not shown) housed in the case  37   b  toward a lock release state in which the lock pawls  37   a  are vertically open. When the door  33  is shut, the lock device  37  engages with the lock pin  42  or the lock pin  47 , the lock pin  42  or lock pin  47  enacts a pressing force on the lock pawl  37   a , the lock pawl  37   a  shuts against the urging force of the spring, and the lock pin  42  or lock pin  47  can be held in a state in which the lock pawl  37   a  is shut. The lock device  37  is covered by a resin protective cover  37   d . Erroneous operation can be prevented without an interior of the lock device  37  being exposed, improving the outer appearance. 
     When the lock release implement  37   c  mounted to the lock device  37  is operated from the inside, or when the lock release button  34   a  of the opening and closing handle  34  is operated from the outside, the hold on the lock pawl  37   a  is released, the lock pawl  37  is opened by the urging force of the spring, the lock pin  42  or lock pin  47  is released from the lock device  37 , and the door  33  can be opened or closed. 
     (Structure of Auxiliary Striker) 
     A detailed structure of an auxiliary striker  45  according to the present invention is described in  FIGS. 5 through 8 .  FIG. 5  shows lateral cross-sectional views of the vicinity of the auxiliary striker  45  in a held posture ( FIG. 5A ) and a retracted posture ( FIG. 5B ); and  FIG. 6  shows front views of the vicinity of the auxiliary striker  45  in the held posture ( FIG. 6A ) and the retracted posture ( FIG. 6B ). The auxiliary striker rotates 150° or less from the retracted posture to reach the held posture.  FIG. 7  shows a side view of the auxiliary striker  45  as seen from the inside; and  FIG. 8  shows a longitudinal cross-sectional view of a mounting part of the auxiliary striker  45 . In  FIGS. 5 through 8 , a cabin door device of the left-side door  33  of the utility vehicle is described. However, the cabin door device of the right-side door  33  is basically a mirror image of the cabin door device of the left-side door  33 . 
     A bracket  39  bent and molded into the shape of a square opened on a left side is anchored to the cross member  22  provided so as to extend between the left and right door frames  21 , as shown in  FIGS. 5 through 8 . A striker  40  is anchored to the bracket  39  by two connecting bolts  44 . 
     The striker  40  is composed of a tabular attaching part  41  and the lock pin  42 , which is anchored to the attaching part  41 . Attaching holes for use in anchoring to the bracket  39  and a threaded part  41   b  (described below) for attaching the auxiliary striker  45  are formed on the attaching part  41 . A stopper  41   c  for controlling the inwardly pivoting range of the auxiliary striker  45  is anchored to an outer side of an upper attaching hole. 
     The lock pin  42  is composed of a columnar rod member that is long in the fore and aft direction. A hexagonal catching part  42   a  is formed on a distal end of the lock pin  42  so that engagement with the lock device  37  will not readily be released. 
     The attaching holes provided to the attaching part  41  of the striker  40  are machined to be larger than the outer form of the connecting bolts  44 , and is configured so that the mounting angle and the vertical and lateral positions of the striker  40  can be adjusted. Machining the attaching holes provided to the attaching part  41  of the striker  40  thus enables the positions and mounting angles of the striker  40  and the auxiliary striker  45  to be precisely adjusted to match the position of the lock device  37 , a seal to be reliably created in a state in which the door  33  is shut, and the position of the auxiliary striker  45  in the held posture, in which the door  33  is slightly open, to be adjusted. 
     The auxiliary striker  45  is composed of a flat arm part  46  and the lock pin  47  anchored to the arm part  46 . The arm part  46  and the lock pin  47  reliably hold the door  33  in the held posture. The thickness of the arm part  46  and the outer diameter of the lock pin  47  are made larger so that the auxiliary striker  45  will not be deformed or damaged even if a large external force is enacted upon the auxiliary striker  45  by the utility vehicle travelling or the like. 
     A boss part  46   a  for rotatably mounting the auxiliary striker  45  to the striker  40  and a contact part  46   b  formed into a concave shape matching the shape of the lock pin  47  of the striker  40  are formed on the arm part  46  of the auxiliary striker  45 . The contact part  46   b  brings the auxiliary striker  45  into contact with the lock pin  47  of the striker  40  in the held posture in which the door  33  is slightly open, and is provided in order to control a lower limit position of the pivoting range. 
     The lock pin  47  at a distal end part of the auxiliary striker  45  is composed of columnar rod member that is long in the fore and aft direction and that has the same shape as the lock pin  42  of the striker  40 . A hexagonal catching part  47   a  is formed on a distal end of the lock pin  47  so that the lock device  37  will not readily be disengaged. 
     The auxiliary striker  45  is mounted to be able to pivot vertically about an axis of the mounting pin  48  via a diaphragm spring  49  and a collar  50  in a state of being fitted around the mounting pin  48  having a spring machined onto a distal end part (see  FIG. 8 ). When the auxiliary striker  45  is pressed down against a reactive force of the diaphragm spring  49 , the contacting part  46   b  of the arm part  46  comes into contact with the lock pin  42  of the striker  40 , the auxiliary striker  45  is positioned in the held posture in which the lock device  37  has engaged, and the auxiliary striker  45  is lifted upward against the reactive force of the diaphragm spring  49 . The position of the auxiliary striker is then held by the reactive force of the diaphragm spring  49  at a position where the auxiliary striker  45  is lifted upward, and the auxiliary striker  45  is held in the retracted posture that is retracted within the cabin  14 . In the utility vehicle, the attaching part  41  of the striker  40  and the auxiliary striker  45  are held by friction via the diaphragm spring  49 . However, the diaphragm  49  is not the only option for a configuration for holding the auxiliary striker  45  by friction, and another configuration may be used. 
     A configuration is used in which, in a state where the auxiliary striker  45  has been pivoted completely upward, the inward pivoting range of the auxiliary striker  45  is controlled by the stopper  41   c , and the auxiliary striker  45  is prevented from mistakenly pivoting excessively and damaging a decorative cover  52  or the like. 
     The shape and other characteristics of the auxiliary striker  45  are set so that, in the held posture in which the auxiliary striker  45  is pushed downward, the axis of the lock pin  47  that engages with the lock device  37  is positioned below an axis P 1  of the auxiliary striker  45  in the fore and aft direction, as shown in  FIG. 6A  (H in  FIG. 6A ). For this reason, in a state in which the auxiliary striker  45  is pushed down to the held posture, even if the door  33  comprising the lock device  37  is closed with great force from the outside and a large force acts upon the lock pin  47  in the lateral direction, the auxiliary striker  45  will be less severely raised by the force, and a state will reliably and easily be created in which the auxiliary striker  45  and the lock device  37  are engaged and the door  33  is held slightly open. 
     As shown in  FIG. 6B , the shape and other characteristics of the auxiliary striker  45  are set so that a center of gravity P 2  of the auxiliary striker  45  will be positioned further toward the inside of the vehicle body than the pivoting support point P 1  of the auxiliary striker  45  in the retracted posture, in which a state is created where the auxiliary striker  45  is pivoted completely upward and brought into contact with the stopper  41   c  (W in  FIG. 6B ). For this reason, even if a centrifugal force in the lateral direction of the vehicle body is generated by the utility vehicle travelling, the auxiliary striker  45  will not readily fall outward against the reactive force of the diaphragm spring  49 . For this reason, fewer component parts are involved and production costs are lower than when, e.g., a holding implement (not shown) for holding the auxiliary striker  45  in an upright state is provided separately. When the position of the auxiliary striker  45  is changed, an action for releasing the holding implement is not necessary, and the auxiliary striker  45  can therefore be made more user-friendly. 
     The auxiliary striker  45  is held at the retracted posture by the reactive force of the diaphragm spring  49  and the center of gravity of the auxiliary striker  45 , thus fewer component parts are used and production costs are lower than when, e.g., a lock implement (not shown) or the like is provided separately and the auxiliary striker  45  is held at the retracted posture. When the position of the auxiliary striker  45  is changed, an action for releasing the lock implement or the like is not necessary, and the auxiliary striker  45  can therefore be made more user-friendly. 
     When the lower parts of the front glass  26  and the rear glass  27  are each opened, the auxiliary striker  45  changes position to the laterally oriented held posture and is linked to the lock device  37 , the utility vehicle travels in a state in which the door  33  is slightly open, outside air can be brought in from the front toward the driver&#39;s seat  12 , and the outside air brought in toward the driver&#39;s seat  12  can be discharged rearward from the gap in the slightly-opened door  33  and the gap at the bottom part of the rear glass, as shown in  FIG. 3 . Air therefore flows through the interior around the driver&#39;s seat  12 , and the occupant space can be made comfortable. 
     Another embodiment relating to a cabin door device shall next be described. 
     A side view of an entire body of a utility vehicle that is an example of a work vehicle is shown in  FIG. 9 ; and a plan view of an entirety of the utility vehicle is shown in  FIG. 10 . In the utility vehicle, a motive force from an engine  102  supported by a vehicle body frame  101  in a vibration-proof state is transmitted to left and right pairs of front wheels  105  and rear wheels  106  via a gear-type transmission device  104  and a hydrostatic stepless transmission device  103  and the like, whereby a four-wheel drive is driven. 
     A lower cover  107  for a front wheel fender, an upper cover  1088  having an opening in a lateral central part of an upper part, a pivoting opening and closing hood  109  for openably and closeably covering the opening, and the like are disposed on a front part of the multi-purpose vehicle. 
     A cabin  114  in which are provided a steering wheel  111  for steering the front wheels, an operator&#39;s seat  112 , and the like is provided to a longitudinally central part of the utility vehicle. The cabin  114  forms an occupant space. 
     A hydraulic dump cylinder  115  is disposed above the gear-type transmission device  104  at the rear part of the utility vehicle. The dump cylinder  115  is extended and contracted, whereby a loading platform  117  is pivoted in the vertical direction using a lateral support shaft  116  provided as a support point at a rear end part of the vehicle body frame  101 . 
     The vehicle body frame  101  comprises a cabin frame  120  that forms the occupant space, a front part frame  118  and rear part frame  119  extending from the cabin frame  120  in the fore and aft direction, and the like. The various frames (e.g.,  118 ,  119 ,  120 ) constituting the vehicle body frame  101  are securely welded together. 
     The cabin frame  120  comprises a left and right pair of door frames  121  that form a boarding and disembarking portal, a plurality of cross members  122  provided extending between the left and right door frames  121 , a floor panel  123  for forming a floor for the occupant space, a support frame  124  for supporting the driver&#39;s seat  112 , a roof panel (not shown) that is positioned at a ceiling portion of the occupant space and that is provided so as to extend between the left and right door frames  121 , and the like. 
     A front surface side and rear surface side of the cabin frame  120  are covered by the openable and closable front glass  126  and the openable and closable rear glass  127 , respectively; and the top of the roof panel is covered by a resin outer roof  125 . 
     A door  130  (described hereafter) is provided to each of the side surfaces of the cabin frame  120 . When the opening and closing handle  137  is operated from inside or outside the driver&#39;s seat  112  and the door lock  138  is released, the outwardly opening left and right pair of doors  130  opens and closes in one direction about an axis of the hinges  136 . 
     The cabin  114  is thus configured so that the driver&#39;s seat  112 , outer roof  125 , front glass  126 , rear glass  127 , doors  130  (described hereafter) are installed in the cabin frame  120 . 
     (Detailed Structure of the Door) 
     A structure of a door for the cabin  114  according to the present invention shall be described with reference to  FIGS. 11 through 14 .  FIG. 11  shows a side view of the door  130  as seen from the outside; and  FIG. 12  shows a side view of the door  130  as seen from inside.  FIGS. 13 and 14  show cross-sectional views along the XIII-XIII line and XIV-XIV line of  FIG. 11 , respectively, in a state in which the door  130  is mounted to the door frame  121 . In  FIGS. 11 through 14 , the left-side door  130  of the utility vehicle is described. However, the right-side door  130  is the same as the left-side door  130 . 
     The door  130  comprises a resin door main body  131 , a reinforcing frame  132  anchored to the door main body  131 , a side glass  134  installed in the door main body  131 , an opening and closing handle  137 , a door lock  138 , and the like. 
     The door main body  131  constituting the door  130  is formed by press-molding an ABS resin plate and covering a surface thereof with an acrylic sheet. An opening  131   a  is formed at a center part of the door main body  131 . The side glass  134  is mounted to the opening  131   a  via a gasket  133 . 
     A bending part  131   b  formed into a bent shape is formed on the inside of the vehicle body across the entire outer peripheral part of the door main body  131 . A sealing member  135  is fitted and anchored from the inside along the entire periphery of a distal end of the bending part  131   b  (see  FIG. 13 ). The bending part  131   b  is thus formed on the outer peripheral part of the door main body  131 , whereby the strength of the door main body  131  at the outer peripheral part of the door  130  is ensured. 
     The door main body  131  is formed from a resin, whereby a distal end part of the bending part  131   b  in which the seal member  135  is fitted can readily be shaved in accordance with the door frame  121 , and a hole-drilling process for the attaching holes for mounting the hinges  136  and the like can be readily performed. For this reason, when, for example, the door main body  131  is attached to the door frame  121 , follow-up processes can readily be performed, and the ability to perform assembly operations can be improved. 
     A hinge mounting part  131   c  for anchoring the hinges  136  for connecting the door  130  to the door frame  121 , a handle mounting part  131   d  for anchoring the opening and closing handle  137  to the door main body  131 , and frame anchoring parts  131   e  for connecting the reinforcing frame  132  to the door main body  131  are integrally formed on the door main body  131 . 
     The hinge mounting part  131   c  is formed into a concave shape from the outer surface of the door main body  131  toward the inside of the vehicle body. The removable hinge  136  is anchored from the outside to the concave part, and is fitted from above into a boss part  136   a  (see  FIG. 9 ) anchored to the door frame  121  in a state in which the removable hinge  136  has been anchored to the door main body  131 , whereby the door  130  can be openably and closeably mounted to the door frame  121 . 
     The handle mounting part  131   d  is formed into a concave shape that extends from the outer surface of the door main body  131  toward the inside of the vehicle body, and the opening and closing handle  137  is anchored from outside of the concave part. The frame anchoring parts  131   e  are formed into a concave shape extending from the outer surface of the door main body  131  toward the inside of the vehicle body  131 . An attaching holes  131   g  for anchoring the door frame  121  is machined into the concave part. 
     The forming of the hinge mounting part  131   c , handle mounting part  131   d , and frame anchoring parts  131   e  into concave shapes extending from the outer surface of the door main body  131  toward the inside of the vehicle body thus enables the hinge  136 , the opening and closing handle  137 , and frame mounting screws  139  to be mounted without protruding from the outer surface of the door main body  131 . For this reason, the opening and closing handle  137  and the like can be mounted without interfering with a driver of the utility vehicle, and the outer appearance of the utility vehicle can be improved. 
     The reinforcing frame  132  comprises a pipe part  132   a  composed of a square-pipe shaped steel tube that has been bent and molded into a loop shape, a bracket  132   b  for mounting the door lock  138 , a handrail  132   c  (described hereafter), and the like. Nuts for use in mounting to the door main body  131  are formed at a plurality of locations on the reinforcing frame  132 . The reinforcing frame  132  is anchored from the outer surface of the door main body  131  by the frame mounting screws  139  via the attaching holes  131   g . The anchoring is achieved in such a state that contact is made from the inside with the inwardly concave parts of the handle mounting part  131   d  and the frame anchoring parts  131   e  formed on the inner surface of the door main body  131 . 
     The lockable door lock  138  is anchored to the bracket  132   b . The door  130  is shut, and the door lock  138  engages with a lock pin  138   a  anchored to the door frame  121 , whereby the door  130  can be held in a shut state (see  FIG. 14 ). A lock release implement  138   b  is mounted on the door lock  138 . When the lock release implement  138   b  is operated from inside or when the opening and closing handle  137  is operated from the outside, the door lock  138  is released, and the door  130  can be opened and closed. 
     The handrail  132   c  is anchored across the reinforcing frame  132  that is disposed near the lower hinge  136  and the reinforcing frame  132  that is disposed close above the opening and closing handle  137 , and a gas damper mounting bracket  132   d  is anchored to a lower side of a front part of the handrail  132   c , as shown in  FIG. 12 . 
     The handrail  132   c  is formed into a shape created by bending both end parts of a curved cylindrical pipe toward the reinforcing frame  132 . The curving of the cylindrical pipe enables the handrail  132   c  to be disposed along a line on the lower side of the side glass  134 . For this reason, the handrail  132   c  can be kept from interfering with the field of view from inside the driver&#39;s seat  112  and outward through the side glass  134 , and the outer appearance of the driver&#39;s seat  112  can be improved. 
     A gas damper  140  for assisting in the opening and closing of the door  130  is mounted so as to extend between the door frame  121  and the gas damper mounting bracket  132   d  that is anchored to the handrail  132   c . As a result, the installation of a stay (not shown) or the like for mounting the gas damper  140  is no longer necessary, and production costs are thereby reduced; the reactive force of the gas damper  130  can more readily act upon the door  130 ; and the gas damper  140  can be disposed in a position where the gas damper is less likely to cause interference even when the door is opened and closed. 
     A door receiving part  121   a  having a concave shape matching the shape of the door  130  is formed along an entire periphery of the left and right pair of loop-shaped door frames  121  that form the boarding and disembarking portals, as shown in  FIGS. 13 and 14 . The door  130  is mounted to the door receiving part  121   a  via the hinge  136  so that the sealing member  135  anchored to the distal end of the bending part  131   b  will be tightly attached in a state in which the door  130  is shut, and the positions of the door lock  138  and lock pin  138   a  are adjusted. 
     When the door  130  is shut and the door lock  138  engages with the lock pin  138   a  anchored to the door frame  121 , the force of the door  130  shutting acts upon the sealing member  135 , and the sealing member  135  is compressed, whereby a reliable seal is created between the door  130  and the door receiving part  121   a . The force of the door  130  shutting acts upon the door main body  131 , the door main body  131  undergoes slight elastic deformation, and a returning force of the elastic deformation acts in a direction in which the sealing member  135  is pressed against the door receiving part  121   a  of the door frame  121 , allowing the seal between the door  130  and the door receiving part  121   a  to be improved. 
     In particular, the bending part  131   b  is provided to the outer peripheral part of the door main body  131 , and the bending part  131   b  and reinforcing frame  132  are formed so that the bending part  131   b  will be positioned to the outside of the reinforcing frame  132  shown in  FIG. 12 . Therefore, the shutting force of the door  130  that is transferred to the door main body  131  by the handrail  132   c  being pulled and pushed does not readily act upon the portion surrounded by the reinforcing frame  132  shown in  FIG. 12 , but readily acts upon the bending part  131   b  positioned to the outside of the portion surrounded by the reinforcing frame  132  shown in  FIG. 12 . For this reason, the force of the door  130  shutting can effectively be made to act on the sealing member  135  via the bending part  131   b.    
     The reinforcing frame  132  is mounted extending along the bending part  131   b  at the outer peripheral part of the door main body  131  at a uniform distance. Therefore, the force of the door  130  shutting acts uniformly across the entire periphery of the door  130 . 
     The bending part  131   b  is provided to the outer peripheral part of the door main body  131 . Accordingly, when the bending part  131   b  is slightly deformed and the door main body  131  is elastically deformed by the force of the door  130  shutting, the returning force of the elastic deformation causes the sealing member  135  to operate perpendicularly to the seal surface of the door frame  121 . The door  130  can be better sealed. 
     OTHER EMBODIMENT 
     In the above-described embodiments, examples were described in which the auxiliary striker  45  is held at the held and retracted postures by the reactive force of the diaphragm spring  49 . However, a configuration may also be used in which the auxiliary striker  45  is held in place by its own weight in the held posture, a holding implement (not shown) for holding the position in the retracted posture is provided separately, and the position of the auxiliary striker  45  can be changed to the held posture and the retracted posture. Specifically, a configuration may be used in which, e.g., a lock pin (not shown) and a lock clasp (not shown) are provided so as to extend between the auxiliary striker  45  and the attaching part  41  of the striker  40 , and the auxiliary striker  45  can be held at the retracted posture. A configuration may also be used in which a holding implement (not shown) for holding the position of the auxiliary striker  45  in the held posture is provided separately. 
     A utility vehicle is described as an example of a work vehicle in the above-described embodiments. However, any other work vehicle may be used as long as the work vehicle comprises a cabin. The present invention may be employed in, e.g., a tractor, combine, or other agricultural vehicle; or a backhoe, wheel loader, or other construction vehicle. 
     In the above-described embodiments, examples were described in which the door can be pivoted open and closed about the axis of the hinge disposed on a front part of the door. However, a configuration may also be used in which the hinge is provided to a rear part of the door, and the door can be pivoted open and closed about an axis of the hinge on the rear part of the door. In addition, the sealing member may be anchored to the door frame instead of to the bending part of the door main body. 
     In the above-described embodiments, examples were described in which the door main body constituting the door is formed by press-molding an ABS resin plate. However, the door main body may be formed from a different material as long as the material is an elastic resin. For example, a plastic plate or a synthetic resin plate may be used. 
     In the above-described embodiments, examples were described in which the reinforcing frame was formed from a square pipe-shaped steel tube and the handrail was formed from a cylindrical pipe. However, the cross-sectional shapes and outer shapes of the reinforcing frame and the handrail may be other shapes.