JP5208073B2 - Construction machine front window lock device - Google Patents

Description

  The present invention relates to a front window locking device for a construction machine that locks a front window of a cab.

  FIG. 5 is a front view showing the mounting state of the front window locking device of the conventional construction machine, FIG. 6 is an enlarged view showing the main part of FIG. 5, and FIG. 7 shows the locking state of the lock plate in the prior art shown in FIG. FIG.

  2. Description of the Related Art Conventionally, some cabs provided in construction machines, such as hydraulic excavators, can store a front window in a ceiling and open the front. Such a cab includes a lock device that locks the front window so that it does not move when the front window is stored in a closed window or ceiling.

  For example, as shown in FIG. 5, this type of cab is a pair of a front window 21 attached to the front surface and a pair of guide rails attached to upper ends of the front window 21 and running on a guide rail (not shown) disposed on the main body. , A handle 23 attached to the left end of the lower part and used to move the front window 21, and locking devices 22 provided at both upper ends of the front window 21.

  As shown in FIGS. 6 and 7, the locking device 22 includes a striker 27 attached to the upper part of the front surface of the cab body so that the front window 21 is locked in a closed window position located on the front side, and a front window. A striker (not shown) that is attached to the rear of the ceiling so that the door 21 is locked in the stowed state moved to the ceiling, and a rotary shaft 30 that is arranged in parallel with the striker 27 and the like and attached to the upper part of the front window 21. have. Further, the lock device 22 is attached to the rotary shaft 30, rotates around the axis of the rotary shaft 30, and has a lock plate 26 having fitting portions 29 a and 29 b to be fitted to the striker 27 and the like, and a bolt 28. The cover 24 is attached to the front window 21 and covers the lock plate 26, and the pipe 31 is connected to the lock plate 26 and rotates the lock plate 26 by pushing toward the front side or the ceiling side of the cab.

  The front window locking device of the construction machine configured as described above locks the front window 21 in the closed window state or the stored state as follows. That is, when the front window 21 is locked in the closed window state positioned on the front side, the front window 21 is closed, the pipe 31 is pushed toward the front side of the cab, and the lock plate 26 is rotated around the axis of the rotary shaft 30. And the fitting part 29a of the lock plate 26 is fitted with the striker 27, and the front window 21 is locked in a closed window state.

  On the other hand, when the front window 21 is locked while being moved to the ceiling, the fitting portion 29a of the lock plate 26 is removed from the striker 27, and the front window 21 is lifted to the ceiling using the handle 23. Thereby, the roller 25 is guided by the guide rail disposed in the cab body, and the front window 21 operates smoothly. Then, when the front window 21 is lifted to the ceiling, the pipe 31 is pushed toward the ceiling of the cab to rotate the lock plate 26 around the axis of the rotary shaft 30, and the fitting portion 29b of the lock plate 26 is provided on the ceiling (not shown) The front window 21 is locked in the retracted state by fitting with a striker.

  In this way, theft and the like can be prevented by locking the front window 21 in the closed state, and the operator can easily hear the voice of the person outside the cab by locking the front window 21 in the stored state. The convenience is good. Further, the design of the front window 21 is improved by covering the lock plate 26 with the cover 24.

  Further, as disclosed in Patent Document 1, the front window automatically locks when the front window reaches the closed or open position, that is, the closed window state or the retracted position, and the lock is released. There is also known a cab front window locking device in which a release lever for performing the operation is arranged at a portion that can be operated by a handle, that is, a finger of a hand holding a handle (see Patent Document 1).

JP 2003-237365 A

  However, in the prior art shown in FIGS. 5 to 7 and the prior art disclosed in Patent Document 1 described above, the lock plate 26 is covered with the cover 23 as shown in FIG. From the seat, it is not known whether the fitting portions 29a and 29b of the lock plate 26 are fitted to the striker 27 or the like and the front window 21 is locked in the closed or retracted state. For this reason, for example, the operator must confirm whether the front window 21 is locked in each of these states by standing the driver's seat and actually moving the front window 21 using the handle 23. It is complicated.

  If the construction machine is operated without this confirmation work, in the unlikely event that the front window 21 is not locked in the closed state, the front window 21 is opened by the vibration caused by the work, and wind and rain, dirt, etc. are generated in the cab. In addition, the lock plate 26 and the front window 21 may vibrate and various parts may be broken.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a front window lock device for a construction machine that can easily confirm whether or not the front window is locked. It is in.

In order to achieve the above object, a front window lock device for a construction machine according to the present invention includes a front window that can be stored in a ceiling, a striker attached to a cab, and is disposed in parallel with the striker. A rotation shaft attached to the upper portion, a lock plate attached to the rotation shaft, having a fitting portion that rotates around the axis of the rotation shaft and engages with the striker, and a cover that covers the lock plate In the front window lock device of a construction machine, the lock state when the fitting portion of the lock plate is fitted with the striker and the non-locking state when the fitting portion of the lock plate is not fitted with the striker. at least one of the lock state with the lock state display means for displaying in the cab, the locked state display means, the locked state and the unlocked state A projection provided on the lock plate and projecting toward the cover; and formed on the cover and projecting the projection when in the unlocked state; and when in the locked state It is characterized by including a notch or a through hole for retreating the protrusion .

The present invention configured as described above can be easily discriminated only by visually observing whether or not the fitting portion of the lock plate is fitted to the striker from the cab by the lock state display means. Thus, before moving the construction machine, the operator can easily confirm whether the front window is locked in a closed window state where the front window is located on the front side or in a stored state where the front window is moved to the ceiling. That is, when the front window is in the locked state, the locking plate fitting portion engages with the striker, so that the protrusion of the lock plate does not protrude from the notch or through hole formed in the cover to the cover side. When the lock plate is in the unlocked state, the lock plate fitting portion does not fit into the striker, so that the projection portion of the lock plate protrudes from the cover notch or through hole to the cover side. Therefore, it is easy to check whether the front window is locked in the closed or retracted state by simply observing whether the protrusion of the lock plate protrudes from the cover notch or through hole to the cover side. Can do. In this way, it is possible to easily grasp the state in which the striker is fitted to the lock plate fitting portion, which is a blind spot for the worker in the cab and is difficult to discriminate. Moreover, since the parts other than the protrusion of the lock plate projecting from the notch of the cover or the through-hole to the cover side are covered with the cover, the conventional design can be maintained.

  Moreover, the front window locking device for a construction machine according to the present invention is characterized in that a color for calling attention is attached to the protrusion. If comprised in this way, it can recognize more reliably whether the front window is locked by the closed window state or the accommodation state only by visually observing the color attached | subjected to the projection part.

The front window lock device for a construction machine according to the present invention is at least in a locked state when the fitting portion of the lock plate is fitted with the striker and an unlocked state when the fitting portion of the lock plate is not fitted with the striker. A lock state display means for displaying one in the cab is provided . The lock state display means displays the lock state and the non-lock state, and is provided on the lock plate and protrudes toward the cover side covering the lock plate. And a notch or a through-hole formed on the cover for projecting the projecting part in the unlocked state and retracting the projecting part in the locked state . Therefore, the operator in the cab visually indicates the display of the lock state display means whether the fitting portion of the lock plate is fitted with the striker from the cab, that is, the closed window state where the front window is located on the front side, Alternatively, it can be easily confirmed whether or not the front window is locked in the storage state moved to the ceiling. Thereby, it can be confirmed whether or not the front window is always locked in the closed state or the stored state in the cab, and safety and durability can be improved as compared with the conventional case.

1 is a side view showing a configuration of a hydraulic excavator as an example of a construction machine to which an embodiment of a front window locking device according to the present invention is applied. It is a perspective view which shows the structure of one Embodiment of the front window locking device of this invention. FIG. 3 is a diagram illustrating a locked state of a lock plate provided in the embodiment illustrated in FIG. 2. It is a figure which shows the lock plate with which one embodiment shown in FIG. It is a front view which shows the attachment state of the front window locking device of the conventional construction machine. It is an enlarged view which shows the principal part of FIG. It is a figure in which the lock plate in the prior art shown in FIG. 6 shows a locked state.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the front window locking device of the construction machine which concerns on this invention is demonstrated based on figures.

  FIG. 1 is a side view showing a configuration of a hydraulic excavator as an example of a construction machine to which an embodiment of a front window locking device according to the present invention is applied, and FIG. 2 is a configuration of an embodiment of a front window locking device of the present invention. FIG. 3 is a view showing a locked state of a lock plate provided in the embodiment shown in FIG. 2, and FIG. 4 is a view showing an unlocked state of the lock plate provided in the embodiment shown in FIG. is there. For the sake of convenience, FIGS. 5 to 7 are used to describe the same or corresponding parts as those of the conventional technology described above, and the corresponding parts are denoted by the same reference numerals.

  One embodiment of a front window locking device for a construction machine according to the present invention is applied to a hydraulic excavator 1 as shown in FIG. 1, for example. The hydraulic excavator 1 includes a traveling body 2, a revolving body 3 that is disposed above the traveling body 2 and has a revolving frame 3 a, and a front work machine that is attached to the front of the revolving body 3 and rotates in the vertical direction. 4 is provided. The revolving unit 3 includes a cab 7 at the front, a counterweight 6 at the rear, and an engine room 5 between the cab 7 and the counterweight 6.

  As shown in FIG. 5, the cab 7 includes a front window 21 attached to the front face and guide rails (not shown) attached to the upper ends of the front window 21 and disposed on the main body. A pair of rollers 25 traveling on the upper side, a handle 23 attached to the lower left end of the lower part and used for moving the front window 21, and locking devices 10 provided at both upper ends of the front window 21 are provided.

  As shown in FIG. 2, the locking device 10 is a striker attached to the upper part of the front surface of the main body of the cab 7 so that the front window 21 is locked in a closed window state located on the front side as in the above-described prior art. 27, a striker (not shown) attached to the rear of the ceiling so that the front window 21 is locked in the storage state moved to the ceiling, and arranged in parallel to the striker 27 and the like, and attached to the upper part of the front window 21 And a rotating shaft 30. Further, the lock device 10 is attached to the rotary shaft 30, rotates around the axis of the rotary shaft 30, and has a lock plate 12 having fitting portions 29 a and 29 b to be fitted to the striker 27 and the like, and a bolt 28. The cover 11 is attached to the front window 21 and covers the lock plate 12. The pipe 11 is connected to the lock plate 12 and rotates the lock plate 12 by being pushed toward the front side or the ceiling side of the cab 7. .

  In particular, the locking device 10 provided in the present embodiment is in a locked state when the fitting portions 29a and 29b of the lock plate 12 are fitted to the striker 27 and the like, and the fitting portions 29a and 29b of the lock plate 12 are strikers. And a lock state display means for displaying at least one of the non-lock states when not fitted, such as a lock state and an unlock state. This lock state display means is provided on the lock plate 12 and is formed on the cover 11 and protrudes toward the cover 11, and projects the protrusion 12 a when unlocked and protrudes when locked. And a notch part 14 for retracting the part 12a. Further, the protrusion 12a is provided with a color that calls attention, for example, a fluorescent color.

  Next, the lock state display means provided in this embodiment will be described with reference to FIGS. In order to make the explanation easy to understand, a part of the cover 11 is omitted from the lock device 10 shown in FIG.

  As shown in FIG. 3, when the front window 21 is in a locked state in which the front window 21 is locked in a closed window state located on the front side, for example, the fitting portion 29 a of the lock plate 12 is fitted with the striker 27. As a result, since the protrusion 12a is retracted to the front side from the notch 14, the protrusion 12a cannot be seen by the cover 11 from an operator in the cab 7, for example, an operator sitting in the driver's seat. .

  On the other hand, as shown in FIG. 4, when the front window 21 is in an unlocked state where the front window 21 is positioned and closed and is not locked, the fitting portion 29 a of the lock plate 12 does not fit the striker 27. The opening end 29a1 of the fitting portion 29a is in contact with the striker 27. Thereby, since the projection part 12a protrudes from the notch part 14, the fluorescent color of the projection part 12a can be seen from the operator sitting in the driver's seat.

  Thus, the lock state display means is in a locked state when the projection 12a of the lock plate 12 is not visible from the notch 14 of the cover 11 from an operator sitting in the driver's seat, and is sitting in the driver's seat. When the protrusion 12a of the lock plate 12 is visible from the notch 14 of the cover 11 from the operator, it indicates that the lock plate 12 is in the unlocked state.

  According to the present embodiment configured as described above, the fitting portion 29a of the lock plate 12 is fitted to the striker 27 when the front window 21 is in the closed window state as shown in FIG. In this case, the protrusion 12a of the lock plate 12 does not protrude from the notch 14 formed in the cover 11 to the cover 11 side, so that the protrusion 12a of the lock plate 12 from the operator sitting in the driver's seat is covered by the cover 11. It can be recognized that the front window 21 is in a locked state without being seen from the notch 14.

  Further, as shown in FIG. 4, when the front window 21 is in the closed window state located on the front side, the fitting portion 29a of the lock plate 12 does not fit the striker 27 and abuts the opening end 29a1 of the fitting portion 29a. In this case, the protrusion 12a of the lock plate 12 protrudes from the notch 14 of the cover 11 to the cover 11 side, so that the protrusion 12a of the lock plate 12 from the operator sitting in the driver's seat It can be seen from the notch 14 and it can be recognized that the front window 21 is in an unlocked state.

  Similarly, similar actions and effects can be obtained when the front window 21 is in the stowed state moved to the ceiling. In this case, when the front window 21 is in the locked state, the fitting portion 29b of the lock plate 12 is fitted with a striker (not shown) provided at the rear of the ceiling, and when the front window 21 is in the unlocked state, the lock plate The twelve fitting portions 29b do not fit with the striker but abut the opening end of the fitting portion 29b. In this way, it is possible to easily confirm whether or not the front window 21 is locked in the closed window state or the housed state only by looking at the protrusion 12a from the driver's seat.

  Moreover, since other parts other than the part which the protrusion part 12a of the lock plate 12 protrudes from the notch part 14 of the cover 11 to the cover 11 side are covered with the cover 11, the conventional design property can be maintained.

  Further, in the present embodiment, the protrusion 12a of the lock plate 12 is given a fluorescent color to clearly check whether the protrusion 12a can be seen from the notch 14 of the cover 11 just by looking from the driver's seat. Therefore, it can be recognized more reliably whether the front window 21 is locked in the closed window state or the retracted state.

  In the present embodiment, the lock state display means is formed on the cover 11, and includes a notch 14 that projects the protrusion 12a when unlocked and retracts the protrusion 12a when locked. Instead of the notch 14, a lock state display means may be formed on the cover 11, and may include a through-hole that projects the protrusion 12a when unlocked and retreats the protrusion 12a when locked.

1 Excavator (construction machine)
2 traveling body 3 revolving body 3a revolving frame 4 front work machine 5 engine room 6 counter weight 7 cab 10, 22 lock device 11, 24 cover 12, 26 lock plate 12a protrusion 14 notch 21 front window 23 handle 25 roller 27 Strike 28 Bolt 29a, 29b Fitting part 29a1 Open end 30 Rotating shaft 31 Pipe

Claims (2)

A front window that can be stored in the ceiling, a striker attached to the cab, a rotating shaft that is arranged in parallel to the striker and attached to the upper portion of the front window, and an axis of the rotating shaft that is attached to the rotating shaft. In a front window lock device for a construction machine, including a lock plate having a fitting portion that rotates around and engages with the striker, and a cover that covers the lock plate,
At least one of the locked state when the fitting portion of the lock plate is fitted with the striker and the unlocked state when the fitting portion of the lock plate is not fitted with the striker is inside the cab. a lock state display means for displaying,
The lock state display means displays the locked state and the unlocked state, is provided on the lock plate, is formed on the cover, and is formed on the cover. A front window locking device for a construction machine, comprising: a notch or a through hole that projects the protrusion when in the state and retracts the protrusion when in the locked state . The front window lock device for a construction machine according to claim 1,
A front window locking device for a construction machine, wherein the projection is provided with a color for calling attention .

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