JP2005335683A - Operator cab for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operator cab for a construction machine having a door designed to convergently arrange at its front part, a lock for holding the door into a closed position or an opened position, and a handle for operating the lock. <P>SOLUTION: The operator cab for the construction machine comprises the door 2 moved backward to open a doorway 15; upper and lower link members 3, 4 with the fixed ends pivotally connected in a swingable manner to a cab box 1 and with the moving ends pivotally connected in a swingable manner to the front end of the door 2; a sliding member 6 pivotally connected in a swingable manner to the rear end of the door 2 and sliding along a slide rail 5 mounted on the outside of the cab box 1; a closed door lock 7 disposed at the front end of the door 2 and engaged with a closed door striker 8 disposed at the cab box 1 when the door 2 is closed; an opened door lock 9 engaged with an opened door striker 10 disposed at the cab box 1, when the door 2 is opened; and a handle 13 mounted at the front end of the door 2 and interlocked with the closed door lock 7 and the opened door lock 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cab for a construction machine, and more particularly to a cab for a construction machine having a door that opens and closes an entrance.

  Construction machines such as hydraulic mini-excavators are configured to perform work by turning a cab or work machine disposed on a vehicle body. The door that is opened and closed to get on and off the operator's cab can be operated not only in a closed state but also in an open state. FIG. 10 shows a large construction machine 60, which has a swivel base 62 that is turnably provided on a vehicle body 61, and a cab 63 is attached to the swivel base 62. In the case of such a large construction machine 60, since the turning radius R ′ is large, the door 64 does not protrude from the turning radius R ′ even when the door 64 of the cab 63 is opened, but the small construction is performed. In the case of a machine, the turning radius is also small, so that the door may protrude from the turning radius when the cab door is opened. Therefore, there is known a cab for a construction machine designed so that the door does not protrude from the turning radius even when the door is opened (see, for example, Patent Document 1). In this case, the door is configured to be able to open and close by moving along the outer peripheral surface of the cab in plan view by sliding the front and rear along the rail, and the side surface of the cab including the door is outside in plan view. By forming a convex curved surface, the door does not protrude from the turning radius of the cab even when it is opened.

JP-A-4-353129

  However, in the case of a door that slides back and forth along the rail, due to its structure, the handle for opening and closing the door is provided on the side in which the door closes (this is the front side), while when the door is opened, The lock that is held in this state when closed is provided on the direction side in which the door is opened (this is the rear side). Therefore, it is necessary to provide a mechanism that connects the handle and the lock to the center of the door and engages and disengages the lock with respect to the striker. A window or the like cannot be provided in the portion where the mechanism is disposed, and the field of view is blocked. In addition, there are problems such that the door structure is complicated and the manufacturing cost is increased, and that the door is thick and the weight is increased. Also, in terms of operability during opening and closing, the deterioration of the opening and closing feeling due to the backlash of the rollers and slide rails constituting the sliding mechanism, and the locus of the door just before closing moves in the direction of rubbing against the cab on the front side, Since the rear side moves along the side surface of the cab, not only does the operation feeling deteriorate, but it also causes water leakage due to poor sealing of the door.

  The present invention has been made in view of such problems, and the front part of the door is attached to the cab case by a link machine, and the rear part of the door is attached to the cab case by a slide mechanism or a link mechanism. It is an object of the present invention to provide a cab for a construction machine having a door that can be opened and closed by the above mechanism.

  In order to solve the above-mentioned problems, a cab according to the present invention is arranged in a construction machine, has a cab space inside, and a cab in which a boarding / exit opening communicating with the cab space is formed. A door, which is attached to the doorway so as to move forward and close the gate, and move backward to open the doorway, and one end pivotally pivoted horizontally to the cab housing, A link member whose other end is pivotally pivoted horizontally to the front end of the door, and a link member that is disposed at the front end of the door and pivots forward with the link member centered on the one end side pivot. When the door moves forward and is positioned at the closed position to close the entrance / exit, the door engages with the door closing striker disposed in the cab casing and holds the front end of the door at the closed position. Closed lock and the rear end of the link member centered on the one-end-side pivot at the front end of the door When the door moves rearward in response to swinging, it engages with a door opening striker provided in the cab casing and keeps the door open. Consists of a lock and a handle that is arranged at the front end of the door and that releases the engagement with the door closing striker or the door opening striker in conjunction with the door closing lock and the door opening lock Is done.

  As the construction machine referred to in the present invention, for example, there is a construction machine in which a driver's cab is turnably disposed on a vehicle body, like a hydraulic mini excavator 50 in the embodiment.

  It is preferable that the link member is composed of an upper link member and a lower link member that are pivotably pivoted horizontally above and below the front end portion of the door. Further, it is preferable that the lower link member is disposed below the floor surface of the cab casing so as not to protrude into the cab space.

  Furthermore, a rear slide member that slides back and forth along a slide rail that extends forward and backward on the outer surface of the cab casing is provided at the rear end portion of the door, and the rear end portion of the door is interposed via the rear slide member. It may be configured to be slidably mounted back and forth on the cab casing. At this time, it is preferable that the slide rail is arranged to extend back and forth at a substantially central portion in the vertical direction of the outer surface of the cab casing at the rear of the entrance.

  On the other hand, the rear end of the door is operated by a rear link member whose one end is pivotally pivoted horizontally to the cab housing and the other end is pivotally pivotally pivoted horizontally to the rear end of the door. You may attach to the rear part of the entrance / exit of a room housing | casing.

  Note that a part of the side surface of the cab casing including the closed door is preferably formed in a planar shape extending in the front-rear direction in a plan view.

  When the cab of the construction machine according to the present invention is configured as described above, the locus of the door immediately before being closed is directed to the inside of the door in the same manner as a conventional hinged door, and the opening and closing feeling is good. Since the sealing member for sealing between the casing and the door is also pressed straight against the cab casing, durability and water tightness can be increased. Even if the slide member is detached from the slide rail, the front part is supported by the link member, so that the door does not fall off the cab casing and can be improved in safety. In addition, the lock and handle that locks the door in the open or closed state are concentrated on the front end of the door, which simplifies the door structure and reduces weight and manufacturing costs. In addition, a window can be provided at the center of the door to widen the view from the cab.

  At this time, by configuring the link member with the upper and lower link members attached to the upper and lower sides of the door, it is possible to eliminate backlash at the front part of the door and improve the opening and closing feeling, and the lower link member does not protrude into the cab space. Thus, getting on and off and safety are not deteriorated. Moreover, the door can be opened and closed smoothly by providing the slide rail at the substantially central portion in the vertical direction.

  Alternatively, the door can be smoothly opened and closed by supporting the rear end portion of the door to the cab housing by the rear link member.

  Further, by forming a part of the side surface of the cab casing including the door in a straight line in plan view, the width of the front and rear portions of the cab can be increased. You can widen your feet.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, before describing the cab according to the present invention, a hydraulic mini excavator 50 as an example of a construction machine having the cab will be described with reference to FIG. The mini excavator 50 includes a swivel base 52 that protrudes upward on a vehicle body 51 that is configured to be able to travel by a crawler device. The mini excavator 50 includes a driver's cab 53 and an engine compartment 54 on the swivel base 52. . The swivel base 52 can be swiveled horizontally with respect to the vehicle body 51, and a work machine 55 that can swing up and down and can bend and stretch is pivotally connected to the front portion of the cab casing 1. It is configured to work by being driven by a cylinder or the like. A door 2 that is opened and closed for an operator to get in and out of the cab 53 is provided on the side of the cab casing 1 that constitutes the cab 53.

  Now, a first embodiment of the structure of the door 2 attached to the cab 53 will be described with reference to FIGS. In the following description, the direction in which the door 2 closes (direction of arrow F in FIG. 1) will be described as the front. As shown in FIG. 1, the door 2 is attached to the cab housing 1 by a link mechanism 20 and the rear portion is attached to the cab housing 1 by a slide mechanism 30 to form the cab housing 1. Thus, the entrance / exit 15 communicating with the cab space 1a can be opened and closed. One end of the link mechanism 20 is pivotably connected to the cab casing 1 and the other end of the link mechanism 20 is swingably pivoted to the door 2 so that the upper link member 3 and the lower link member are attached to the top and bottom of the door 2. 4. On the other hand, the slide mechanism 30 includes a slide rail 5 provided on the outer side of the cab casing 1 and a slide member 6 that slides along the slide rail 5. The slide mechanism 30 is provided at a substantially central portion in the vertical direction of the entrance 15.

  As shown in FIGS. 3 and 4, the upper and lower link members 3, 4 constituting the link mechanism 20 are pivotally connected at one end (fixed ends 3 a, 4 a) to the cab casing 1, and the other end ( The moving ends 3b and 4b) are pivotally connected to the upper and lower ends of the front portion of the door 2 so as to be swingable. The swing shafts extending vertically of the fixed ends 3a and 4a of the upper and lower link members 3 and 4 are coincident in plan view, and the swing shafts extending vertically of the moving ends 3b and 4b are also identical in plan view. I'm doing it. For this reason, as shown in FIGS. 3 and 4, when the door 2 is opened and closed, the upper and lower link members 3 and 4 pivot (swing) around the fixed ends 3a and 4a. The fixed end 4a of the lower link member 4 is attached below the floor of the cab casing 1, and the lower link member 4 including the fixed end 4a projects into the cab casing 1 (the cab space 1a). There is no need to do so, so there is no reduction in boarding and safety.

  As shown in FIGS. 1, 5, and 6, the slide mechanism 30 includes a slide rail 5 that is attached to the outside of the cab casing 1 so as to extend in the front-rear direction at a substantially central portion in the up-down direction behind the entrance 15. The slide member 6 is attached to the door 2 and slides along the slide rail 5. The slide rail 5 has a groove with an opening facing outward, and the top surface of the groove is bent downward to form a rail groove 5a. The slide member 6 is attached to a substantially vertical center of the rear portion on the inner side of the door 2 (on the side of the cab casing 1), and is fitted to stoppers 11 and 12, which will be described later. The oscillating portion 6b is pivotally connected, and has a guide roller 6c and a center roller 6d which are inserted into a groove of the slide rail 5 and slide in the groove.

  In a state where the slide member 6 is slidably attached to the slide rail 5, the guide roller 6c is positioned in the rail groove 5a of the slide rail 5 and rolls and slides along the rail groove 5a. The roller 6d rolls and slides along the lower surface 5b in the groove of the slide rail 5. As described above, since the tip of the upper surface of the slide rail 5 forming the rail groove 5a is bent downward, the guide roller 6c is prevented from being detached from the rail groove 5a and along the rail groove 5a. The slide member 6 is guided and slid. Further, since the swinging portion 6b of the slide member 6 can swing with respect to the abutting portion 6a, even if the slide rail 5 is bent and attached as shown in FIG. By swinging, the door 2 can slide.

  The door 2 is provided with a door closing lock 7 that holds the door 2 in a closed position. As shown in FIG. 3, the cab casing 1 ( It is configured to be locked by a door closing striker 8 provided in front of the entrance / exit 15. Further, a door opening lock 9 for holding the door 2 in an opened state is provided at the front portion of the door 2, and the cab casing of the facing portion of the door 2 opened as shown in FIG. 4 is provided. 1 (behind the entrance / exit 15), it is comprised so that it may be latched by the striker 10 for door opening. In this embodiment, the door closing lock 7 and the door opening lock 9 provided at the front portion of the door 2 are provided as separate members as shown in FIG. It is also possible to configure.

  In the cab casing 1, a door opening stopper 11 that holds the door 2 in a state where the door 2 is opened and fitted with the abutting portion 6 a at the rear of the door 2 and the door 2 is closed. In this state, a door closing stopper 12 is provided to hold the closed state by fitting with the rear abutting portion 6a of the door 2. As shown in FIG. 5, the door opening stopper 11 includes a bracket 11b attached to the rear of the slide rail 5, and a protrusion 11a attached to the bracket 11b and extending substantially in parallel with the slide rail 5 (extending forward and backward). It consists of. Further, as shown in FIG. 6, the door closing stopper 12 includes a bracket 12b attached to the front of the slide rail 5, and a protrusion that is attached to the bracket 12b and extends outward with respect to the cab casing 1. 12a. Both stoppers 11 and 12 are configured such that the abutting portion 6a of the slide member 6 and the projecting portions 11a and 12a are fitted in a state where the door is opened or closed. As shown in FIG. 5, the projection 11a of the stopper 11 for opening the door is inserted into and fitted into a fitting portion 6e formed on the side of the abutment 6a, and the projection of the stopper 12 for closing the door. As shown in FIG. 6, 12a is inserted and fitted in the fitting part 6f formed in the front-end | tip part of the abutting part 6a. The door opening stopper 11 also has a function of restricting the slide member 6 from coming off the rear end of the slide rail 5.

  In the case of a conventional door that slides back and forth, a tab tail (part to be fixed by inserting a concave and convex shape) is arranged in front of the door to open and fix the door, and the counterpart part is a cab casing (center pillar part) However, it requires a rugged bracket for mounting on the inside of the upper and lower parts in front of the door, which impairs safety and obstructs the field of view. Stoppers also protruded from the outside, impairing design and safety. However, according to the configuration of the present embodiment, only the door opening stopper 11 for fixing the rear portion of the door is attached along the rear portion of the slide rail 5, and the door closing stopper 12 and the bump The portion 6a and the like are hidden behind the door 2 and cannot be seen from the outside, and the appearance (design), safety, and visibility are improved.

  A handle 13 for opening and closing the door 2 from inside or outside the cab casing 1 is provided at the front part of the door 2, and interlocked with the door closing lock 7 and the door opening lock 9. The door 2 can be opened and closed by releasing the engagement with the strikers 8 and 10. Since such a mechanism for opening and closing the door 2 is concentrated on the front part of the door 2 (in the case of FIG. 1, the central part in the vertical direction), the structure of the door 2 is simplified. The door 2 can be made thin, or a conventional press-molded one can be manufactured with a pipe frame or the like. Therefore, it is possible to reduce the weight of the door 2 and reduce the manufacturing cost. Furthermore, the window 14 can be provided in the center part of the door 2, and the view from the inside of the cab case 1 can be expanded.

  FIG. 3 shows a state in which the door 2 is closed. When the door 2 is closed, the door closing lock 7 provided at the front portion of the door 2 and the striker 8 are engaged to fix the front portion. At the same time, the projection 12a of the stopper 12 for closing the door is fitted into the fitting portion 6f formed in the abutting portion 6a of the slide member 6, and the rear portion is fixed. In this state, since the front portion of the door 2 is supported by the upper and lower link members 3 and 4, it is fixed to the cab casing 1 without play.

  FIG. 4 shows a state where the door 2 is opened. When the door 2 is opened, the door opening lock 9 provided at the front portion of the door 2 and the striker 10 are engaged to fix the front portion. At the same time, the protrusion 11a of the stopper 11 for opening the door is fitted into the fitting portion 6e formed in the abutting portion 6a of the slide member 6, and the rear portion is fixed. Also at this time, since the front portion of the door 2 is supported by the upper and lower link members 3, 4, it is fixed to the cab casing 1 without play.

  Thus, by supporting the front part of the door 2 with the link mechanism 20, the door 2 is held by the link mechanism 20 even if the slide member 6 is detached from the slide rail 5. It does not fall and can increase safety.

  There is a gap between the slide rail 5 and the guide roller 6c and the center roller 6d of the slide member 6 for rotating the guide roller 6c and the center roller 6d, and the guide roller 6c and the center roller 6d are held. Since the swinging portion 6b is also configured to swing with respect to the abutting portion 6a, the rear portion of the door 2 becomes a cause of rattling. However, as described above, when the door 2 is opened and closed, the stoppers 11 and 12 are fitted and fixed to the abutting portions 6a fixed to the door 2 of the slide member 6. Therefore, it is possible not only to fix the door 2 but also to stably support it without play. In addition, the driver's cab is formed by forming the fitting portions 6e and 6f on the abutting portion 6a of the slide member 6 without separately providing a portion that fits with the stoppers 11 and 12 for fixing the door 2. The side of the housing 1 is clean and does not impair the design.

  The trajectory when the door 2 configured as described above is opened and closed will be described with reference to FIG. As described above, since the front part of the door 2 is swung by the link mechanism 20 and the rear part is slid by the slide mechanism 30, the orbit when the door 2 is opened and closed is determined by the link mechanism 20 and the slide mechanism 30. Thus, the front part moves along the track C1 of FIG. 7, and the rear part moves along the track C2. For this reason, as shown in FIG. 7, the track immediately before the door 2 is closed is configured such that the front part is directed in the direction of the arrow A, that is, the inside of the door 2 in the same manner as when the hinged door is closed. In the case of a conventional door that slides back and forth, the door will slide in the direction different from the direction of rotation of the roller that rolls along the rail (front-rear direction) (door inner direction) just before closing. However, in the case of this embodiment, the opening / closing feeling is good because there is no increase in the amount of operation because of the swinging of the link mechanism 20. In the case of the method of sliding the front part of the door, the open / close feeling is deteriorated due to the backlash. However, in this embodiment, the front part of the door 2 is supported by the link mechanism 20 so that the backlash is not good. There is no opening and closing feeling. Further, since a seal member (not shown) attached to the door 2 for sealing the door 2 with the cab casing 1 is also configured to be pressed in the direction of arrow A, the conventional slide It does not slide sideways like a type door, and durability and water tightness can be enhanced.

  As shown in FIG. 3, the insertion angle of the door closing stopper 12 with respect to the fitting portion 6 f is an engagement point between the fixed ends 3 a and 4 a of the upper and lower link members 3 and 4 or the door closing lock 7 and the striker 8. And a direction D perpendicular to a straight line connecting the pivotal portion of the slide member 6 and an angle θ are set parallel to the moving direction E of the slide member 6. For this reason, the rear part of the door 2 is configured so as to be in the direction of the arrow B inclined forward from the direction of the arrow A due to the shape of the slide rail 5. Therefore, the door closing lock 7 and the striker 8 are engaged and fixed at the front portion of the door 2 so that the door 2 can be fixed in a closed state without rattling. Moreover, since the rear part of the door 2 can be slid to the cab casing 1 side by the slide mechanism 30, the rear part of the door 2 and the cab casing 1 are substantially the same when the door 2 is closed. Since it can comprise so that it may be located on a surface, the rear part of the door 2 does not protrude from the side surface of the cab case 1.

  Next, as shown in FIG. 8 (A), a part 1a of the side surface of the cab casing 1 to which the door 2 is attached is a plan view. Are formed in a straight line extending in the front-rear direction. The front portion 1b in front of the linearly formed side portion 1a is formed in a curved shape convex outward with a radius of curvature r in plan view. Since the side of the door side of the conventional cab includes a door in a plan view and is formed in an outwardly convex curved shape, the width direction becomes narrow at the front and rear portions of the cab, and in particular, boarded the cab The operator's feet were narrow. However, by adopting the configuration of the present embodiment, if the width of the cab is the same, it is possible to widen the feet of the operator who has boarded the cab 53 by making a part of the width straight. At this time, since the rear part of the door 2 constituting the side part 1a is also formed in a straight line, a part of the rear part of the door 2 is swung with the door 2 opened as shown in FIG. Although it may protrude from the radius R, the cab width L1 of the cab 53 with the door 2 opened is almost the same as that of a conventional door that slides back and forth, and there is no problem in practical use.

  When the door 2 is large and heavy, the weight of the door 2 is increased by attaching a rotating roller 16 as shown in FIG. 9 in order to reinforce the strength of the upper and lower link members 3 and 4 constituting the link mechanism 20. It is also possible to configure so as to support. In this case, a flat support member (not shown) is provided below the upper and lower link members 3 and 4, and the door 2 is opened and closed by the rotation roller 16 rolling on the support member. At this time, the rotating roller 16 includes a bearing portion 16b extending from the side portion of the link members 3 and 4 to the side, and a roller member 16a rotatably attached to the bearing portion 16b, and the roller member 16a. Is configured to extend on a line connecting the fixed end 3a (4a) and the moving end 3b (3b) of the link members 3 and 4. The rotating roller 16 can be provided on either the upper link member 3 or the lower link member 4 depending on the weight of the door 2.

  Moreover, in the above Example, the case where it provided so that fitting part 6e, 6f was provided in the abutting part 6a of the slide member 6, and the protrusion parts 11a and 12a of the stoppers 11 and 12 were comprised was demonstrated. However, it is also possible to provide the stoppers 11 and 12 with a fitting portion and provide the abutting portion 6a with a protruding portion that fits into the fitting portion.

  In the first embodiment, the case where the front part of the door 2 is instructed by the link mechanism 20 and the rear part is instructed by the slide mechanism 30 has been described. However, the front and rear parts are instructed by the link mechanism or the slide mechanism. Each configuration is described below. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, the case where the front and rear of the door 2 are supported by the link mechanism 120 as a second embodiment will be described with reference to FIGS. In the second embodiment, the link mechanism 120 includes a front link member 103 and a rear link member 104 that are mounted side by side, and one end (fixed end 103a, 104a) is an upper portion of the cab casing 1. The other ends (moving ends 103b and 104b) are pivotally connected to the front and rear of the upper portion of the door 2.

  Further, the door 2 is held in a state in which the door 2 is opened while being fitted with a stopper 11 attached to the rear portion of the cab casing 1 and the door 2 is closed. An abutting portion 106 is provided that holds the closed state by fitting with the stopper 12 attached to the substantially central portion of the cab casing 1. The abutting portion 106 has the same shape as the abutting portion 6a of the slide member 6 in the first embodiment.

  Thus, also in the second embodiment, when the door 2 is closed (FIG. 12), the door closing lock 7 provided at the front portion of the door 2 and the striker 8 provided in the cab casing 1 are provided. And the front portion of the door 2 is fixed, and the abutting portion 106 and the stopper 12 are engaged to fix the rear portion of the door 2. When the door 2 is opened (FIG. 13), the door opening lock 9 provided at the front portion of the door 2 and the striker 10 provided in the cab casing 2 are engaged with each other. The front portion of the door 2 is fixed, and the abutting portion 106 and the stopper 11 are engaged to fix the rear portion of the door 2.

  As described above, even if the door 2 is configured to be supported only by the link mechanism 120, the handle 13, the door closing lock 7, and the door opening lock 9 are concentrated on the front portion of the door 2. Since the door 2 can be arranged, the structure of the door 2 is simplified, the thickness of the door 2 can be reduced, the pipe 2 can be manufactured, and a window 14 is provided at the center of the door 2. it can.

  11 shows a case where the link mechanism 120 is provided at the upper part of the door 2, but a mechanism similar to the link mechanism 120 is provided at the lower part of the door 2 so as to support the upper and lower sides. It is also possible. Further, the number of the stoppers 11 and 12 and the abutting portion 106 can be increased according to the vehicle size and required strength of the machine body (for example, the hydraulic mini excavator 50) (for example, the stoppers 11 'and 12' shown in FIG. 11). Abutting portion 106 ').

  Next, as a third embodiment, the case where the front and rear of the door 2 are supported only by the slide mechanisms 30, 230, 240 will be described with reference to FIGS. In this third embodiment, the upper part of the front part of the door 2 is supported by the upper slide mechanism 230, the lower part of the front part is supported by the lower slide mechanism 240, and the substantially central part of the rear part in the vertical direction is the same as in the first example. Is supported by the slide mechanism 30.

  The upper slide mechanism 230 includes an upper slide rail 203 attached to the cab casing 1 along the upper side of the entrance / exit formed in the cab casing 1, and an upper slide mechanism 203 that slides along the upper slide rail 203. The lower slide mechanism 240 includes a lower slide rail 204 attached to the cab casing 1 along the lower side of the entrance and a lower slide member that slides along the lower slide rail 204. 304.

  Also in the third embodiment, when the door 2 is closed (FIG. 15), the door closing lock 7 provided at the front portion of the door 2 and the striker 8 provided in the cab 1 are provided. The front portion of the door 2 is fixed by being engaged, and the abutting portion 6a and the stopper 12 are engaged and the rear portion of the door 2 is fixed. When the door 2 is opened (FIG. 16), the door opening lock 9 provided at the front portion of the door 2 and the striker 10 provided in the cab casing 2 are engaged with each other. The front portion of the door 2 is fixed, and the abutting portion 6a and the stopper 11 are engaged to fix the rear portion of the door 2.

  Therefore, even if the door 2 is configured to be supported only by the slide mechanisms 30, 230, and 240, the handle 13, the door closing lock 7, and the door opening lock 9 are concentrated on the front portion of the door 2. The structure of the door 2 can be simplified, the thickness of the door 2 can be reduced, or the door 2 can be manufactured with a pipe frame, and a window 14 is provided in the center of the door 2. Can do.

It is a side view which shows the cab of the construction machine which concerns on 1st Example of this invention. It is a side view showing an example of a construction machine having a cab according to the present invention. It is a top view which shows the principal part of the cab when a door is closed in 1st Example. It is a top view which shows the principal part of the cab when a door is opened in 1st Example. It is a figure which shows the principal part of the slide mechanism containing the stopper for door opening in 1st Example, (A) is a top view, (B) is a rear view. It is a top view which shows the principal part of the slide mechanism containing the stopper for door closing in 1st Example. It is a top view which shows a locus | trajectory when opening and closing a door in 1st Example. It is a top view which shows the shape of the cab which concerns on this invention, (A) is a figure which shows a shape when a door is closed, (B) is a figure which shows a shape when the door is opened. It is a figure which shows the link member which provided the rotating roller in 1st Example, (A) is a top view, (B) is a side view. It is a top view which shows the conventional large sized construction machine. It is a side view which shows the cab of the construction machine which concerns on 2nd Example of this invention. It is a top view which shows the principal part of the cab when a door is closed in 2nd Example. It is a top view which shows the principal part of the cab when a door is opened in 2nd Example. It is a side view which shows the cab of the construction machine which concerns on 3rd Example of this invention. It is a top view which shows the principal part of the cab when a door is closed in 3rd Example. It is a top view which shows the principal part of the cab when a door is opened in 3rd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Driver's cab case 1a Driver's cab space 2 Door 3 Upper link member 4 Lower link member 5 Slide rail 6 Slide member 7 Door closing lock 8 Door closing striker 9 Door opening lock 10 Door opening striker 13 Handle 15 Entry / exit 50 Hydraulic mini excavator (construction machine)
51 Car body 53 Driver's cab 103 Front link member 104 Rear link member

Claims (8)

A cab for a construction machine,
A cab housing having a cab space inside, and having a boarding gate that communicates with the cab space;
A door attached to the entrance to move forward to close the entrance, and move backward to open the entrance;
A link member having one end pivoted horizontally to the cab casing and pivotable horizontally to the front end of the door;
The door is disposed at the front end portion of the door, and the door moves forward in response to the forward swing of the link member with the one end side pivot portion as a center, so that the door is closed. A door closing lock that engages with a door closing striker disposed in the cab casing and holds the front end of the door in a closed position;
When the door is moved rearward and opened in response to the swinging of the link member about the one end side pivotal portion disposed at the front end portion of the door, the cab is A door opening lock that engages with a door opening striker disposed in the housing to hold the door open;
A handle disposed at a front end portion of the door, and interlocked with the door closing lock and the door opening lock to release the engagement with the door closing striker or the door opening striker; A cab of a construction machine, characterized by comprising:   The cab for a construction machine according to claim 1, wherein the cab is arranged on a vehicle body so as to be pivotable and the construction machine is configured.   2. The construction machine according to claim 1, wherein the link member includes an upper link member and a lower link member that are pivotably pivoted horizontally above and below the front end portion of the door. Cab.   4. The construction machine according to claim 3, wherein the lower link member is disposed below the floor surface of the cab casing so as not to protrude into the cab space. 5. Cab.   A rear slide member that slides back and forth along a slide rail that extends back and forth on the outer surface of the cab casing is provided at the rear end of the door, and the rear end of the door is moved to the rear slide member. The cab of a construction machine according to claim 1, wherein the cab is attached to the cab casing so as to be slidable back and forth.   6. The cab of a construction machine according to claim 5, wherein the slide rail is arranged to extend back and forth at a substantially central portion in the vertical direction of the outer surface of the cab casing at the rear of the boarding gate. .   One rear end of the door is pivotably pivoted horizontally to the cab casing, and the other end of the rear link member is pivotally pivoted horizontally to the rear end of the door. The cab for a construction machine according to claim 1, wherein the cab is attached to a rear portion of the entrance / exit of the cab casing.   The cab for a construction machine according to claim 1, wherein a part of a side surface of the cab casing including the closed door is formed in a planar shape extending in the front-rear direction in a plan view.

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