JP6194142B2 - Construction machine front window opening and closing device - Google Patents

Description

  The present invention relates to a front window opening and closing device for a construction machine that opens and closes an opening formed in a front surface of a cab of a construction machine such as a hydraulic excavator by a front window.

  On the front surface of the cab of a construction machine such as a hydraulic excavator, an opening is formed for viewing the work location directly rather than through the glass, and the opening is opened and closed by a front window. The front window is moved to a fully closed position covering the opening in the front of the cab and a fully opened position along the ceiling in the cab, and is locked / unlocked (unlocked) at the fully closed position and the fully opened position. ing.

  As an invention to open and close the front window of the construction machine, the front window is moved to the fully closed position and the fully opened position by electric force, and locked and unlocked at the fully closed position and fully opened position by electric force. The thing is known (refer patent document 1). According to the present invention, the driver (operator) does not need to manually open / close the front window and perform the lock / unlock operation, thereby reducing the operation burden.

Japanese Patent Publication No.7-116728

  However, if the opening / closing movement of the front window and the locking / unlocking operation are fully automatic as described above, when an electrical trouble occurs, various problems may occur due to malfunction.

  For example, when working with the front window locked in the fully closed position, if the construction machine climbs over a step and falls, the electrical wiring of the switchgear is cut or the switchgear motor is damaged, The window may be locked in the fully closed position and cannot be unlocked. Here, when the cab entrance door cannot be opened or closed due to a fall, the driver is trapped in the cab and cannot escape without breaking the front window glass.

  Further, since the operation of opening the front window is also electric, for safety reasons, the opening operation speed by electric driving of the front window cannot be set faster than a predetermined safe speed. For this reason, in the event of an emergency, if the driver tries to escape by opening the front window, the front window can be opened quickly at a speed higher than the preset electric safety speed even if unlocking is possible. The escape will be delayed.

  On the other hand, if the opening / closing movement of the front window and the locking / unlocking operation are all manual, the front window is not fully locked at the fully closed position (so-called half-door state) due to a driver's operation failure (operation error). There is a possibility that the operability for completely locking the front window in the fully closed position is not good, and the reliability of the lock is low. If the front window is not fully locked in the fully closed position, the vehicle may be stolen or mischievous by the vehicle.

  The present invention was devised in view of the above-mentioned problems, and can prevent the driver from being locked by avoiding the inability to unlock the front window in the fully closed position due to electrical troubles. Front window opening and closing device for construction machinery that can be opened quickly, prevents imperfect locking in the fully closed position of the front window and increases the reliability of the lock, and improves operability, reliability and safety The purpose is to provide.

According to the present invention, it has a front window that opens and closes an opening formed on the front surface of a cab of a construction machine, a lock mechanism attached to the front window, and a striker attached to the cab, and the front window has an opening. When moved to the fully closed position, the front of the construction machine locks the front window to the fully closed position by engaging the striker with the lock mechanism and unlocks the front window by releasing the lock mechanism from the striker. It is a window opening and closing device, and the lock mechanism is a fully closed automatic lock mechanism that automatically pulls the front window moved to the fully closed position to the fully closed position and locks it, and the front window locked to the fully closed position is manually operated. The fully-closed automatic lock mechanism includes a latch that is pushed by the striker and rotates in the engagement direction when the front window is moved to the fully closed position, and a rotation of the latch. Depending on movement And a motor that is actuated by turning on the switch, and a motor bracket that further rotates the latch in the engaging direction in response to the actuation of the motor, and the manual unlocking mechanism contacts the latch to disengage the latch. A release lever that rotates in the release direction, an operation lever that is attached to the front window and that is operated by the driver, and a connecting member that connects the operation lever and the release lever. It is attached in the vicinity of one of the grips provided in the middle of the section, and the driver operates the operation lever by holding the grip on the side where the operation lever is provided with one hand and the other hand. There is provided a front window opening and closing device for a construction machine, wherein the opening and closing operation of a front window is performed in a state where a grip on a side where no operation lever is provided is gripped .

The locking mechanism may be provided in the middle of the vehicle width direction above the front window, and the striker may be provided in the middle of the vehicle width above the opening in the cab. .

  The latch is provided with an engagement pin, and the motor bracket is provided with a long hole for engaging the engagement pin. When the switch is turned on, the motor pulls the motor bracket to engage the engagement pin at the end of the long hole. Is pressed to rotate the latch in the engaging direction, and then the motor bracket is pushed out to separate the end of the long hole from the engaging pin. The gap between the end of the long hole and the engaging pin is the latch. When the is rotated in the release direction, the engagement pin may be a space for moving toward the end of the long hole.

  The release lever includes a first release lever to which the connecting member is connected, and a second release lever that is rotated according to the rotation of the first release lever to rotate the latch in the release direction. The main opening holding which has a secondary lock lever which is rotated according to the rotation of the first release lever and which is engaged with and disengaged from the latch in order to hold the front window in the fully open position along the ceiling on the ceiling in the cab. While attaching the striker for a secondary, you may attach the striker for secondary opening holding | maintenance which engages / disengages with a secondary lock.

  According to the front window opening and closing device of the construction machine according to the present invention, the front window in the fully closed position is manually unlocked, so that the front window cannot be unlocked due to electrical troubles and the driver is prevented from being trapped. It is possible to open the front window quickly in case of emergency. In addition, since the front window that has been moved to the fully closed position is automatically pulled to the fully closed position and locked, the incomplete closing state of the front window due to poor operation of the driver is prevented, and the locking reliability is increased. It is possible to improve operability, reliability and safety.

It is the perspective view which looked up the cab equipped with the front window opening / closing apparatus of the construction machine used as the premise of this invention from diagonally downward. FIG. 2 is a side view of the front window opening and closing device showing a state in which the front window shown in FIG. 1 is locked in a fully open position. FIG. 3 is a side view of the apparatus showing a state in which the front window shown in FIG. 2 is unlocked from the fully opened position and slightly moved in the opening direction. It is a side view of the apparatus which shows the state which the front window shown in FIG. 3 approached the fully closed position. FIG. 5 is a side view of the apparatus showing a state in which the front window shown in FIG. 4 is locked in a fully closed position. It is explanatory drawing which shows the outline | summary of the front window opening / closing apparatus of the construction machine which concerns on one Embodiment of this invention. FIG. 7 is a perspective view of the front window opening and closing device when the front window shown in FIG. 6 is brought close to a fully open position. It is explanatory drawing which shows the procedure in which the front window shown in FIG. 6 is locked in a fully-closed position, (a) is a state in which the latch of the locking mechanism is separated from the striker, and (b) is a state where the latch is pressed against the striker. Indicates that the motor is switched on. It is explanatory drawing following FIG.8 (b), (c) shows the state in which the latch was further rotated in the engagement direction by the motor bracket, (d) is the motor bracket reversely prepared for the subsequent unlocking. The state moved in the direction is shown. It is explanatory drawing which shows a mode that the front window locked in the fully-closed position as shown in FIG.9 (d) is unlocked.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Outline of front window opening and closing device 1 of construction machinery)
The outline | summary of the front window opening / closing apparatus 1 of the construction machine used as the premise of this invention is demonstrated using FIGS. FIG. 1 is a perspective view of a cab 2 equipped with a front window opening / closing device 1 of a construction machine as viewed from an obliquely lower side, and FIG. 2 shows a state in which the front window 3 shown in FIG. 1 is locked in a fully open position. 3 is a side view of the apparatus 1 showing a state in which the front window 3 shown in FIG. 2 is slightly moved from the fully open position, and FIG. 4 is a view showing the front window 3 shown in FIG. 3 being moved to the vicinity of the fully closed position. FIG. 5 is a side view of the apparatus 1 showing a state in which the front window 3 shown in FIG. 4 is locked in the fully closed position.

  As shown in FIG. 1, a front window opening / closing device 1 of this construction machine includes a front window 3 that opens and closes an opening 4 formed on the front surface of a cab 2 of the construction machine, and a lock mechanism 5 attached to the front window 3. And the striker 6 attached to the cab 2, and when the front window 3 is moved to the fully closed position covering the opening 4 as shown in FIG. 3 is locked in the fully closed position, and the lock of the front window 3 is released when the lock mechanism 5 is detached from the striker 6 as shown in FIG. As shown in FIG. 1, the front window 3 is fully closed by a link type opening / closing mechanism 7 so as to cover a fully open position along the ceiling in the cab 2 (see FIG. 2) and an opening 4 formed on the front surface of the cab 2. To a position (see FIG. 5).

  As shown in FIGS. 1 and 2, the link type opening / closing mechanism 7 includes a guide rail 8 disposed in the cab 2 along both sides of the opening 4, and a guide rail provided on the window frame 3 a of the front window 3. 8 and a link lever 9 in which an upper end 9a is rotatably supported on the upper portion of the cab 2 and a lower end 9b is rotatably connected to the middle of the left and right sides of the window frame 3a. And. A damper 10 is provided between the link lever 9 and the front pillar 2a of the cab 2 to assist the movement of the front window 3 in the opening direction. A grip 11 is provided to be held by both hands. The front window 3 opens the opening 4 and opens the cab when the driver holding the grip 11 rotates the link lever 9 around the upper end 9a and moves the guide member 3b along the guide rail 8. 2 is manually moved to a fully open position (see FIG. 2) along the ceiling in 2 and a fully closed position (see FIG. 5) covering the opening 4.

  As shown in FIG. 2, when the front window 3 is moved to the fully open position, the lock mechanism 5 engages with the open holding striker 12 attached to the rear part of the ceiling of the cab 2 and is locked to the fully open position. . The open-holding striker 12 has a main open-holding striker 12a and a secondary open-holding striker 12b made of U-shaped fittings attached to the rear part of the ceiling in the cab, and the lock mechanism 5 is engaged with these. Thus, the front window 3 is double-locked. The front window 3 locked in the fully opened position shown in FIG. 2 will be described in detail later, but the lock mechanism 5 is manually operated by the driver so that the lock mechanism 5 is opened and held by the striker 12 (main opening and holding striker 12a, secondary opening and holding striker). 12b) and the lock is released (manual lock release). Thereafter, the front window 3 is moved forward by the driver's manual operation, and is moved to the fully closed position as shown in FIG. 5 through the states of FIGS. 3 and 4. When the front window 3 is manually moved to the fully closed position, it is automatically (electrically) pulled to the fully closed position, and the lock mechanism 5 is engaged with the striker 6 (closed holding striker), so that the fully closed position is reached. Locked (automatic lock). The closed-holding striker 6 is composed of a U-shaped fitting attached above the opening in the cab.

(Lock mechanism 5)
FIG. 6 is an explanatory view showing an outline of the front window opening and closing device 1 of the construction machine according to one embodiment of the present invention, and FIG. 7 is a perspective view when the front window 3 is brought close to the fully open position (see FIG. 3). It is. As described above, the lock mechanism 5 attached to the front window 3 is engaged with the main opening holding striker 12a and the secondary opening holding striker 12b attached to the cab 2 when the front window 3 is moved to the fully open position. (See FIGS. 1 and 2). The lock mechanism 5 is engaged with a closing striker 6 attached to the cab 2 when the front window 3 is moved to the fully closed position as shown in FIGS. 5). As shown in FIGS. 6 and 7, the lock mechanism 5 includes a fully-closed automatic lock mechanism 5a that automatically pulls the front window 3 that has been moved to the fully-closed position to the fully-closed position and locks it. A manual unlocking mechanism 5b for manually unlocking the front window 3 locked in position is provided.

(Fully closed automatic lock mechanism 5a)
As shown in FIGS. 8A and 8B, the fully-closed automatic lock mechanism 5a moves the front window 3 that has been manually moved to the position before fully-closed, as shown in FIGS. 9C and 9D. As shown in Fig. 5, the automatic (electric) is drawn to the fully closed position and locked. When the front window 3 is manually moved from the position shown in FIG. 8 (a) to the position before full closing shown in FIG. 8 (b), the fully-closed automatic lock mechanism 5 is pushed by the closed holding striker 6 to be engaged. Latch 13 that rotates in the direction (clockwise), switch 14 that is turned on away from latch 13 in response to the rotation of latch 13, and motor 15 that is actuated when switch 14 is turned on (FIGS. 6 and 7). And a motor bracket 16 that further rotates the latch 14 in the engaging direction as shown in FIG. 9C in accordance with the operation of the motor 15.

  As shown in FIGS. 8A and 8B, the latch 13 has a pressing portion 13a that is pressed by the striker 16, and the pressing portion 13a is pressed by the striker 16 so that the support shaft 13b is rotated. Is rotated clockwise. The latch 13 is rotatably supported by a support frame (not shown) attached to the front window 3 via a support shaft 13b. The latch 13 is opposed to the latch 13 and the support frame. A spring (coil spring) 17 is interposed to bias the coil so as to rotate clockwise. That is, the latch 13 shown in FIG. 8A is always urged counterclockwise by the spring 17 and is rotated clockwise when pushed by the striker 6 as shown in FIG. 8B. .

  As shown in FIG. 8B, when the latch 13 is pushed by the striker 16 and rotated clockwise, the switch 14 that has been pushed by the side of the latch 13 is released and the switch 14 is turned on. . The switch 14 is attached to a bracket 18 attached to the above-described support frame. When the switch 14 is turned on, the motor 15 shown in FIGS. 6 and 7 is operated, and the motor bracket 16 moved by the motor 15 is pulled to the left as shown in FIG. 9C. As a result, the latch 13 is further rotated in the engaging direction (clockwise), and the striker 6 is engaged with the engaging claw 13 c of the latch 13. In other words, the latch 13 is formed with an engaging claw 13c that is connected to the above-described pressing portion 13a to wrap and hold the striker 6 and is formed from the engaging claw 13c to the pressing portion 13a. Is the engaging groove 13d that engages with the striker 6.

  The engagement groove 13d faces obliquely upward when the striker 6 is separated as shown in FIG. 8 (a) to allow the striker 6 to be engaged, and the striker 6 as shown in FIG. 8 (b). When the pressing portion 13a is pressed by this, the latch 13 rotates in the engaging direction and faces substantially in the horizontal direction. As shown in FIG. 9C, the latch 13 is pulled by the motor bracket 16 and further in the engaging direction. When turned, the striker 6 faces obliquely downward and cannot be removed. Thereafter, as will be described later with reference to FIG. 9 (d), even if the motor bracket 16 is pushed rightward, the pushing portion 23b of the second release lever 23 is pushed against the stopper wall 13i of the latch 13 and is latched. Since the rotation angle of 13 is maintained with the engaging groove 13d directed obliquely downward, the striker 6 cannot be detached from the engaging groove 13d, and the front window 3 is locked in the fully closed position.

  As described above, when the front window 3 is manually moved by the driver from the position shown in FIG. 8 (a) to the position before full closing shown in FIG. 8 (b), the front window 3 is automatically closed. By 5a, as shown in FIGS. 9C and 9D, it is automatically (electrically) drawn to the fully closed position and locked at the fully closed position. The front window locked in the fully closed position is manually unlocked by the driver by a manual unlock mechanism 5b described below.

(Manual unlocking mechanism 5b)
The manual unlocking mechanism 5b manually unlocks the front window 3 locked in the fully closed position as shown in FIG. 9 (d) as shown in FIG. 10 (e). The manual unlocking mechanism 5b includes a release lever 19 for rotating the latch 13 shown in FIG. 9D in the release direction (counterclockwise direction) as shown in FIG. 10E, and the release lever 19 remotely. As shown in FIG. 6, an operation lever 20 attached to the front window 3 and a connection member (connection wire 21) for connecting the operation lever 20 and the release lever 19 are provided. When the driver pulls the operating lever 20, the connecting wire 21 is pulled, the release lever 19 is rotated via the connecting wire 21, and the latch 13 shown in FIG. 9D is shown in FIG. 10E. To the release direction (counterclockwise). When the latch 13 is thus rotated in the release direction, the engaging groove 13d of the latch 13 faces obliquely upward as shown in FIG. 10E, and the striker 6 can be detached from the engaging groove 13d. The front window 3 can be unlocked. The front window 3 that can be unlocked is slightly moved in the opening direction by the assisting force of the damper 10 (see FIG. 1), and then moved in the opening direction by the driver manually holding the grip 11.

  As shown in FIGS. 9D and 10E, an engagement pin 13e is provided at the end of the latch 13, and the motor bracket 16 has a long hole (with which the engagement pin 13e is engaged). An arc-shaped long hole) 16a is provided. 7B, the latch 13 is pushed by the striker 6 and rotated in the engaging direction (clockwise) as shown in FIG. 8B, and the latch 13 is separated from the switch 14 and switched. When 14 is turned on, the motor bracket 16 is pulled to the left as shown in FIG. 9C, and the engagement pin 13e is pressed against the end of the long hole 16a to further engage the latch 13 in the engagement direction (clockwise). Then, as shown in FIG. 9D, the motor bracket 16 is pushed out to the right, and the end of the long hole 16a is separated from the engaging pin 13e. Such push-pull movement of the motor bracket 16 is achieved by rotating the motor 15 forward and backward or using a cam mechanism. In FIG. 9D, when the gap 16b between the end of the long hole 16a and the engaging pin 13e rotates the latch 16 in the release direction (counterclockwise direction) as shown in FIG. The coupling pin 13e moves toward the end of the long hole 16a and becomes a space for allowing rotation.

(Release lever 19)
As shown in FIGS. 9D and 10E, the release lever 19 is rotated according to the rotation of the first release lever 22 to which the connecting wire 21 is connected and the first release lever 22. And a second release lever 23 that rotates the latch 13 in the release direction (counterclockwise). The first release lever 22 is rotatably supported on the above-mentioned support frame by a support shaft 22a, and as shown in FIG. 7, a return spring (string winding spring) 24 attached to the outer periphery of the support shaft 22a. The rotation angle is held elastically. The second release lever 23 is rotatably supported on the support frame by a support shaft 23 a and is urged clockwise by a spring (coil spring) 25 interposed between the second release lever 23 and the latch 13.

  The second release lever 23 has a pressing portion 23 b that is pressed against the latch 13 by the force of the spring 25. The pressing portion 23b of the second release lever 23 is pressed against the bottom of the recess 13f of the latch 13 in the state of FIG. 8A, but the latch 13 is pressed by the striker 6 as shown in FIG. When it is slightly rotated in the engagement direction (clockwise), it is separated from the bottom of the recess 13f and is pressed against the overhang 13g of the latch 13. Next, as shown in FIG. 9C, when the latch 13 is pulled by the motor bracket 16 and further rotated in the engaging direction (clockwise), the pressing portion 23 b of the second release lever 23 is moved to the latch 13. Falls from the overhang portion 13g to the step portion 13h. Next, as shown in FIG. 9 (d), when the motor bracket 16 is pushed in the reverse direction (rightward), the latch 13 is rotated counterclockwise by the spring 17, so that the second release lever 23 is pressed. The portion 23b is pressed against a stopper wall 13i formed between the step portion 13h of the latch 13 and the overhang portion 13g. Thereby, the rotation angle of the latch 13 is held at the lock angle, and the front window 3 is locked.

  Thereafter, when the driver holds the grip 11 shown in FIG. 6 and pulls the operation lever 20 in the state of FIG. 9D, the connecting wire 21 is pulled, and as shown in FIG. The release lever 22 is rotated counterclockwise, the pressing portion 22b of the first release lever 22 is pressed against the pressed portion 23c of the second release lever 23, and the second release lever 23 is rotated counterclockwise. . At this time, the pressing portion 23b of the second release lever 23 is separated from the stopper wall 13i of the latch 13 shown in FIG. 9D when the second release lever 23 rotates counterclockwise around the support shaft 23a. Then, when the latch 13 is pulled by the spring 17 and rotated counterclockwise (release direction), the latch 13 falls into the recess 13f of the latch 13 as shown in FIG. Thereby, the rotation angle of the latch 13 is held at the unlocking angle, and the unlocking of the front window 3 is achieved. Thereafter, when the driver releases the operation lever 20 shown in FIG. 6, the first release lever 22 shown in FIG. 10 (e) is rotated clockwise by the return spring 24 (see FIG. 7). Return to the state (a) (default state).

(Secondary lock lever 26)
As shown in FIG. 7, the lock mechanism 5 includes a secondary lock lever 26 that is rotated according to the rotation of the first release lever 22. The secondary lock lever 26 is engaged with and disengaged from the hole 26a inserted into the support shaft provided in the support frame and the secondary open holding striker 12b (see FIGS. 1 and 2) attached to the ceiling in the cab 2. And a claw 26b. Further, as shown in FIG. 7, the secondary lock lever 26 is formed with a pressing portion 26 c that contacts the protruding portion 22 c of the first release lever 22. The secondary lock lever 26 is urged counterclockwise by a spring (string wound spring) 27, and the pressing portion 26 c is pressed against the protruding portion 22 c of the first release lever 22.

  As shown in FIGS. 1 and 2, when the front window 3 is brought close to the fully open position and the engaging claw 26b of the secondary lock lever 26 shown in FIG. 7 is pressed against the striker 12b for holding the secondary opening, the secondary lock lever 26 Gets on the striker 12b and the spring 27 is elastically deformed, whereby the secondary lock lever 26 is rotated clockwise. When the striker 12b passes the maximum raised portion of the engaging claw 26b, the secondary lock lever 26 is rotated counterclockwise by the force of the spring 27, and the striker 12b is held by the secondary lock lever 26. As a result, the front window 3 is locked in the fully open position. At the same time, the latch 13 of the lock mechanism 5 engages with the main open holding striker 12 a attached to the ceiling in the cab 2. The latch 13 is engaged with the main open holding striker 12a for closing and holding the latch 13 described with reference to FIGS. 8 (a), 8 (b), 9 (c), and 9 (d). Since it is the same as the engagement with the striker 6, description is abbreviate | omitted.

  After that, when the driver holds the grip 11 shown in FIG. 6 and pulls the operating lever 20, and the connecting wire 21 shown in FIG. 7 is pulled, the first release lever 22 is rotated counterclockwise, The protrusion 22c of the 1 release lever 22 presses the pressing portion 26c of the secondary lock lever 26, and the secondary lock lever 26 is rotated clockwise. Thereby, the holding of the secondary open holding striker 12b by the engaging claw 26b of the secondary lock lever 26 is released. At the same time, the latch 13 of the lock mechanism 5 is detached from the main open holding striker 12a. The release of the latch 13 from the main open holding striker 12a is the same as the release of the latch 13 from the closed holding striker 6 described with reference to FIGS. 9 (d) and 10 (e). Omitted.

(Other)
As shown in FIG. 6, the lock mechanism 5 is attached at one place on the upper portion of the front window 3. Specifically, the lock mechanism 5 is attached to the upper part of the window frame 3a of the front window 3 so as to be shifted to one side (left side) in the vehicle width direction. The reason for this is that, as shown in FIG. 1, the main opening and holding striker 12a and the secondary opening and holding striker 12b that engages and disengages with the lock mechanism 5 are avoided from the radio main body 28 and the speaker 29 that are attached to the ceiling of the cab 2. This is because the striker 6 for closing and holding is closed in the vehicle width direction while avoiding the wiper motor 30 attached to the upper front portion of the cab 2.

  As shown in FIGS. 1 and 6, the operation lever 11 is attached in the vicinity of the grip 11 on either the left or right side (for example, the right side) of the front window 3. Accordingly, the driver can perform the unlocking operation with one hand, and the operability of unlocking the front window 3 is improved. That is, the driver only needs to firmly hold the right grip 11 with the right hand and operate the operation lever 20, and the left hand grip 11 with the left hand can be gripped with a rough grip, so the operability is improved. As described above, when the driver operates the operation lever 20, the lock mechanism 5 is unlocked (unlocked) via the connecting wire 21.

(Action / Effect)
According to the front window opening and closing device 1 of the construction machine according to the present embodiment, the front window 3 locked in the fully closed position is manually unlocked, so that the front window 3 cannot be unlocked due to electrical trouble. Thus, the driver can be prevented from being trapped, and the front window can be opened quickly in an emergency. That is, if it is a type that electrically unlocks the front window 3 in the fully closed position, it cannot be unlocked due to electrical trouble and the front window 3 cannot be opened, and it may be difficult to escape in an emergency, In this embodiment, since the front window in the fully closed position is unlocked manually, such a problem does not occur.

  In addition, since the front window 3 unlocked in the fully closed position is manually moved in the opening direction, the front window 3 can be opened quickly and quickly according to the operation of the driver. Escapeability increases. That is, if the front window 3 is of a type that moves the motor from the fully closed position to the fully opened position, the opening speed of the front window 3 that is electrically driven cannot be set faster than a predetermined safety speed. When the driver tries to escape by opening the front window 3, even if the lock can be released, the front window 3 cannot be opened quickly at a speed higher than the preset electric safety speed, and the escape is delayed. However, in this embodiment, since the front window 3 is manually moved, such a problem does not occur.

  Further, since the front window 3 that has been moved to the fully closed position is automatically (electrically) pulled to the fully closed position and locked, incomplete locking of the front window 3 due to a driver's operation failure (operation error) can be prevented. That is, if the opening / closing movement and the locking / unlocking operation of the front window 3 are all manually performed, the front window 3 is not sufficiently locked in the fully closed position due to a driver's operation failure (operation error) (so-called halfway). In the present embodiment, the front window 3 that has been manually moved to the position before the fully closed position is automatically (electrically operated) although the vehicle may be stolen or mischievous by the vehicle. Thus, the lock is performed by pulling it to the fully closed position, so that an incomplete lock state can be prevented and a so-called half-door state can be avoided. Therefore, operability, reliability, and safety can be improved.

  Moreover, in the conventional electric open / close lock type described in Patent Document 1, electric lock mechanisms are respectively attached to the left and right sides of the front window, and two motors are required. On the other hand, in this embodiment, as shown in FIG. 6, the lock mechanism 5 is provided only at one location on the upper part of the front window 3 and is remotely operated by the operation lever 20 via the connecting wire 21. Therefore, only one motor 15 is sufficient, and cost reduction can be promoted. In addition, since the connection wire 21 is penetrated inside the window frame 3a of the front window 3, the trouble which hooks the connection wire 21 can be avoided, and it looks good and looks good.

  In addition, since the lock mechanism 5 is arranged in the middle of the upper portion of the front window 3, it is possible to prevent the holding force of the lock by the lock mechanism 5 from acting on the front window 3 excessively in the left-right direction. It is done. Therefore, even if the lock mechanism 5 is repeatedly locked and unlocked according to the use over time, the front window 3 can be prevented from being twisted due to the holding force of the lock mechanism 5 acting on the left and right unbalance.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples and modifications also belong to the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a front window opening / closing device of a construction machine that opens and closes an opening formed on the front surface of a cab of a construction machine such as a hydraulic excavator by the front window.

DESCRIPTION OF SYMBOLS 1 Front window opening / closing apparatus 2 Cab 3 Front window 4 Opening 5 Lock mechanism 5a Fully-closed automatic lock mechanism 5b Manual lock release mechanism 6 Striker (Striker for closed holding)
12 Opening striker 12a Main opening holding striker 12b Secondary opening holding striker 13 Latch 13e Engaging pin 14 Switch 15 Motor 16 Motor bracket 16a Long hole 16b Clearance (space)
19 Release lever 20 Operation lever 21 Connection member (connection wire)
22 First release lever 23 Second release lever 26 Secondary lock lever

Claims (4)

A front window that opens and closes an opening formed on the front surface of a cab of a construction machine, a lock mechanism attached to the front window, and a striker attached to the cab, wherein the front window covers the opening. When moved to the closed position, the lock mechanism engages the striker to lock the front window in the fully closed position, and the lock mechanism disengages from the striker to unlock the front window. A front window opening and closing device for a construction machine,
The lock mechanism automatically pulls the front window that has been moved to the fully closed position to the fully closed position and locks it automatically, and manually unlocks the front window that is locked to the fully closed position. A manual unlocking mechanism for
The fully-closed automatic lock mechanism includes a latch that is pushed by the striker and rotates in an engaging direction when the front window is moved to a position before fully closed, and a switch that is turned on in accordance with the rotation of the latch, A motor operated by turning on the switch, and a motor bracket that further rotates the latch in the engagement direction in accordance with the operation of the motor;
The manual lock release mechanism includes a release lever that contacts the latch and rotates the latch in a release direction, an operation lever that is attached to the front window and is operated by a driver, the operation lever, and the release lever. And a connecting member for connecting
The operation lever is attached in the vicinity of one of the grips respectively provided in the middle of the left and right sides of the front window,
In a state where the driver grips the grip on the side where the operating lever is provided with one hand and operates the operating lever and the grip on the side where the operating lever is not provided with the other hand, A front window opening / closing device for a construction machine, wherein the front window opening / closing operation is performed . The locking mechanism is provided in the upper part of the front window, in the middle of the vehicle width direction,
2. The front window opening and closing device for a construction machine according to claim 1, wherein the striker is provided in the middle of the vehicle width direction above the opening in the cab . An engagement pin is provided on the latch,
Providing a slot for engaging the engagement pin in the motor bracket,
When the motor is turned on, the motor pulls the motor bracket to press the engagement pin against the end of the elongated hole and rotate the latch in the engagement direction. And the end of the elongated hole is separated from the engagement pin,
The gap between the end of the long hole and the engagement pin becomes a space for the engagement pin to move toward the end of the long hole when the latch is rotated in the release direction. The front window opening and closing device for a construction machine according to claim 1, wherein the opening and closing device is for a construction machine. The release lever includes a first release lever to which the connecting member is connected, and a second release lever that is rotated in accordance with the rotation of the first release lever to rotate the latch in the release direction. ,
The lock mechanism has a secondary lock lever that is rotated according to the rotation of the first release lever,
In order to hold the front window in the fully open position along the ceiling, a main open holding striker that engages and disengages with the latch is attached to the ceiling in the cab, and a secondary open holding striker that engages and disengages with the secondary lock. The front window opening and closing device for a construction machine according to any one of claims 1 to 3, wherein the front window opening and closing device is attached .

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