JP3343073B2 - Cab front windows of construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of a lock device provided on a cab front window.

[0002]

2. Description of the Related Art A cab front window must be locked for caution when construction machinery is not used, and when the window is opened, an accident may occur if the window suddenly falls and closes. Therefore, it is necessary to lock even if the window is opened. Therefore, a lock device has conventionally been provided on the front window. As a conventional lock device, for example, there is a cab opening / closing window fixing device disclosed in Japanese Utility Model Publication No. 4-134710. As shown in FIG. 6, the cab 11 is provided with a recessed holding portion 11a, the fixing member 13a is provided above the window frame 12, the lock pin 13b is slidably provided, and the cab 11 is connected by links 13c and 13f. It is the structure which did.

When the operator opens a window with the above-mentioned fixing device, the handle 15 provided at the lower portion of the window frame 12 is gripped with one hand and the rotating lever 14 fixed to the link 13f is turned to disengage the window. Open. To lock the window, the user grips the handle 15 and moves it to a predetermined position, and turns the rotation lever 15 counterclockwise to insert the lock pin 14b into the holding portion 11a and engage it.

This locking device requires a complicated operation for locking, that is, a troublesome operation of grasping the handle 15 and moving the lock pin 14b to a position where the lock pin 14b is engaged with the holding portion 11a for positioning. . Further, when the window is opened and fixed by this fixing device, it is necessary to perform the above operation with the face facing upward, and the operation of fixing the window is further complicated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made under the above-described background. When a window is locked by using a commercially available or existing lock lock, the window can be automatically locked. It is an object of the present invention to provide a front window of a construction machine having a lock device that can be unlocked by a simple operation even when the lock is released, and that is reliably and easily opened and closed.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention employs the following means. That is, according to the first aspect of the present invention, a closed lock lock and an open lock lock having the same structure are respectively provided in a front window of a construction machine which is slidably provided between a front surface of a cab and a space above a ceiling so as to be opened and closed. The front side of the window frame is disposed on the upper surface of the window frame of the front window so that the locking directions are substantially orthogonal to each other in side view, and at both sides of the closed lock lock and the open lock lock provided on the upper surface of the window frame. A first guide pin is provided on an upper portion, and a second guide pin is provided on an upper surface of the window frame, and the first guide pin is engaged with the first guide pin when the front window is moved to a position where it can be closed below. A first guide is provided on the upper inner wall of the front surface of the cab, and the first guide pin is engaged with the first guide when the window frame is pushed forward in a state where the first guide pin can be engaged with the first guide. And the lock is closed. A first lock member is disposed on the inner wall of the front surface of the cab so as to be locked, and is engaged with the second guide pin when the front window is slid rearward behind the ceiling to a position where it can be opened. A second guide is provided at a possible position, and the second lock member is disposed on the inner wall above the ceiling so that the second guide pin is engaged with the second guide and the open lock is automatically locked. Further, the closed lock lock and the open lock lock are connected by a connecting member so as to be simultaneously operable in an unlocking direction, and an operating lever is connected to the connecting member, and the operating lever is disposed above the inside of the front window. It is characterized by doing.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a state in which a window equipped with a lock device according to an embodiment of the present invention is locked at a position above a ceiling (a state in which the window is opened) as viewed from inside the cab. FIG.
Shows a plan view from above when locking at the position of the cab front. FIG. 3 shows the lock used in this embodiment, and FIG.
FIG. 3 is a cross-sectional view taken along arrow XX for explaining the structure. FIG. 5 shows an embodiment of another connection method. FIG. 6 shows a conventional fixing device.

In FIG. 1, an open lock lock (second lock device) 22 and a closed lock lock (first lock device) 23 are fixedly provided on the upper surface of the window frame of the front window. The open lock lock 22 and the close lock lock 23 are mounted with locks of the same structure in different mounting directions. That is, the open lock 22 is attached so as to automatically lock the lock member 25 when it is moved in the longitudinal direction of the window frame 21 (the direction of arrow A in the figure). That is, the open lock 22 is locked with the window opened by locking the lock member 25. The lock member 25 is attached to an attachment member 26 fixedly mounted on the back of the cab.

As shown in FIGS. 3 and 4, the unlocking lock 22 includes a locking piece 42 having a curved portion 42a in the lock body 41 and a U-shaped lock.
A character-shaped movable piece 43 is provided. The movable piece 43 is a shaft 44
And the spring 45
Urged in the counterclockwise direction in the figure. Also,
The rotation of the movable piece 43 is restricted by a stopper (not shown) to a position where the lock member 25 can be locked (the position shown). A locking member 47 is provided on the fixing piece 42 so as to be rotatable around a shaft 48, and is urged in a counterclockwise direction by a spring 49. Locking side 4 of locking member 47
The movable piece 43 is locked when 7a is locked with the locking side 43b of the movable piece 42. Further, a release lever (not shown) for releasing the locking of the locking member 47 is provided outside, and a connection hole 47 b for connecting to the release lever is provided in the locking member 47.

The lock member 25 is fixed to the mounting member 25b so as to close both ends of the opening side of the U-shaped member 25a,
The mounting member 25b is fixed to an inner wall or the like (see FIG. 4). Therefore, according to the above configuration, when the open lock 21 is moved downward in the figure, the opening 43a of the movable piece 43 comes into contact with the member 25a of the lock member 25, and when the lock is further moved, the movable piece 43 moves clockwise. It rotates and the opening 43 of the movable piece
The member 25a is gripped by a and the curved portion 42a of the fixed piece, and the locking side 43b and the locking side 47a are locked, and locking is performed.
To release the lock, pull the connection hole 47b of the locking member 47 in the right direction (the direction of the arrow) in the figure to open the lock 22.
Is performed simultaneously.

A guide pin 27 is provided on the upper surface of the window frame 21 of the front window, and the guide pin 27 engages with a guide 28 provided on the mounting member 26 to open the lock 2.
2 and the lock member 25 are positioned at the correct lock position.

The closing lock 23 is perpendicular to the window frame 21,
That is, it is attached so that it is automatically locked when it is moved in the direction of the dotted arrow B in FIG. 1 (downward direction in the figure). The closed lock lock 23 uses a lock lock having the same structure as the open lock lock 22. FIG. 2 shows a state in which the front window is closed and the closing lock 23 is locked. The lock member 35 is fixed to a mounting member 36 provided on the front wall. The window frame 21 is provided with a guide pin 37 projecting forward, and is configured to engage with a guide 38. The open lock lock 22 and the close lock lock 23 are connected to the release lever 31 by connecting members 29, 30. When the release lever 31 is turned clockwise, the open lock lock and the close lock lock are unlocked. Note that a handle 32 for opening and closing the window is attached to the window frame 21.

This embodiment is configured as described above, and functions as follows. That is, when the front window is to be opened from the closed state, the release lever 31 is operated (turned clockwise) to put the closed lock lock 23 in the unlocked state. This releases the closing lock. Thereafter, the user lifts the front window with the handle 32 and moves the front window while sliding the front window backward. When the front window is slid until stopped, the open lock 22 automatically locks the lock member 25. When the lock is released and the front window is closed, the reverse operation is performed. That is, the release lever 31 is rotated clockwise to put the open lock 22 in the unlocked state. This operation releases the lock. Handle 32
Hold down and lower the front window to the lowermost point in the front, and push forward. With this operation, the lock lock 23 locks the lock member 35, and the front window is locked.

This embodiment has the following effects because it is configured and functions as described above. That is, since the lock is performed by using the automatic lock lock and the release means can be operated by one release lever, the opening and closing and locking of the front window can be performed by a simple operation.

The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and changes in design and the like may be made without departing from the gist of the present invention. The present invention is included in the present invention. For example, the case where the direction of the release direction of the first lock device is different from the direction of the release direction of the second lock lock also belongs to the technical scope of the present invention (the invention according to claim 1).

Further, the connecting method is not limited to the above. For example, the connection method may employ various connection methods shown in FIG. FIG. 5 shows an example in which the closing release means and the opening release means are connected by, for example, wires such as steel wires 51 and 52. The steel wires 51, 52 are connected to the connecting member 54 of the release lever 53, and tension adjusting means 55, 56 are provided in the middle of the steel wires 51, 52.
Insert When the release lever 53 is pulled downward, the release is performed. It is to change the direction of the tension of the idle vehicle 57 to facilitate the connection.

[0017]

As described above, according to the structure of the present invention, an effect is obtained that the operation for opening and closing the front window is facilitated.

[Brief description of the drawings]

FIG. 1 shows a state in which a front window is opened and locked according to an embodiment of the present invention.

FIG. 2 shows a state where a front window is closed and locked.

FIG. 3 shows a lock used in the present embodiment.

FIG. 4 is a cross-sectional view taken along arrow XX in FIG.

FIG. 5 shows an embodiment of another connection method.

FIG. 6 shows a conventional fixing device.

[Explanation of symbols]

 21 Front Window Frame 22 Open Lock Lock (Second Lock Device) 23 Close Lock Lock (First Lock Device) 25, 35 Lock Member 27, 37 Guide Pin 29, 30 Connecting Member 31 Release Lever (Operation Lever)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60J 1/04 B62D 33/06 E05B 65/12

Claims (1)

(57) [Claims] 1. A front window of a construction machine in which a cab is slidably provided between a front surface of a cab and an underside of a ceiling so as to be openable and closable. A first guide pin is disposed on the upper surface of the window frame of the front window so as to be substantially orthogonal to each other, and a first guide pin is provided on the upper portion of the front surface of the window frame at both sides of the closed lock and the open lock provided on the upper surface of the window frame. And a second guide pin is provided on an upper surface of the window frame, and a first guide which engages with the first guide pin when the front window is moved to a position where the front window can be closed below is provided on the front surface of the cab. The first guide pin is engaged with the first guide when the window frame is pushed forward in a state where the first guide pin is engageable with the first guide, and the closed lock lock is provided. Is automatically locked A first lock member is disposed on the inner wall of the front surface of the cab, and the front window is slid rearward behind the ceiling to a position where the second window can be engaged with the second guide pin when the front window is moved to a position where it can be opened. A second guide is provided, and the second lock member is disposed on the inner wall behind the ceiling so that the second guide pin is engaged with the second guide and the unlock lock is automatically locked. The closed lock lock and the open lock lock are connected by a connecting member so as to be simultaneously operable in an unlocking direction, and an operating lever is connected to the connecting member, and the operating lever is disposed above the inside of the front window. And cab front windows of construction machinery.