JPH0624244A - Lock device for window - Google Patents

Abstract

PURPOSE:To automatically stop a window in the most effective lock condition by providing a friction clutch for suppressing a rise of torque, transmitted to an output plate at lock time, to a fixed value or less, so as to prevent a mulfunction. CONSTITUTION:A motor 6 is driven to rotate an output plate 3, and a window glass G is pressed to a ceiling 82 and locked by a toggle lock device. Even when placed in this lock condition, since a slight time lag is generated after an overcurrent is detected by an overcurrent detecting means 62 till it is actuated in order to stop rotating the motor 6, it is continued to be driven before actuating the overcurrent detecting means 62. Accordingly, torque transmitted to the output plate 3 is further increased, and when the torque reaches a preset value in a friction clutch 7, a slip is generated in the friction clutch 7. As a result, the torque transmitted to the output plate 3 is maintained to a fixed value, to prevent a lock from its mulfunction.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a locking device. More specifically, the present invention relates to a lock device for locking a window of a cabin of a construction machine, which has a curved surface extending from at least the front surface to the ceiling, at an arbitrary opening degree.

[0002]

2. Description of the Related Art Conventionally, in a construction machine such as a power shovel or a crane truck, a window in front of a cabin is openable / closable in order to improve a working environment of an operator by improving air permeability of the cabin. However, windows are usually heavy and difficult to open and close by hand.

Therefore, the present inventors have developed an opening / closing device for automatically opening / closing a window glass.

As shown in FIG. 4, this is a drive device 31, a cable 32 for pushing and pulling the window glass G by driving the drive device 31, and a front surface 81 of the cabin 80.
To the ceiling 82, the guide rails 33 extending on both sides of a continuous curved surface, the rollers 34 mounted on the window glass G and rolling in the guide rail 33, and the rollers provided near the lower end of the window glass G are provided. Connecting member 35 for connecting the cable 32
And a lock device 41 that locks the window glass G at the fully opened position inside the ceiling 82.

This locking device 41 includes output plates 43 and 2 driven by a motor 42 as shown in FIGS.
It has a toggle mechanism composed of a pair of arms 44, 45. Such a lock device 41 is specifically configured as follows.

That is, the motor 42 is fixed to the window glass G, and the output plate 43 is connected to the output end of the motor 42. One end of the first arm 44 is swingably supported on the output plate 43 at a position eccentric from the position where the motor 42 is connected to the output end. One end of a second arm 45 is swingably supported at the other end of the first arm 44, and a roller 46 is rotatably supported at the pivot point between the first arm 44 and the second arm 45. It is pivotally supported. The other end of the second arm 45 is swingably attached to the side end of the window glass G.

An L-shaped stopper 47 is formed integrally with the output plate 43. A stopper rubber 48 is attached to the window glass G so as to come into contact with the stopper 47 when the lock is released.

Then, the window glass G is locked by the locking device.
If you lock, it is done as follows.

FIG. 5 shows the locking device 41 in the unlocked state, in which state the output plate is
The first arm 44 eccentrically attached to the roller 42
Is used as a fulcrum to push the upper end of the window glass G away from the ceiling 82. Therefore, the window glass G can be moved along the guide rail 33.

Next, when the output plate 43 is rotated in the direction of arrow A from this state, the first arm 44 and the output plate 43 are rotated.
The connection point 49 with the opposite side of the shaft center of the motor 42 (see FIG. 6).
Move to point C). As a result, roller 46 and motor
42 approaches. That is, the window glass G has a ceiling at its upper end.
It is pulled up in the direction of 82, pressed against the ceiling 82, and locked (see FIG. 6). In this way, the window glass G is locked. As described above, since this locking device 41 has a toggle action, it can be locked with a small torque.

Further, the lock device 41 detects the overcurrent flowing inside the motor 42 at the time of locking and automatically
42 rotation is stopped. That is, the first arm
When the connection point 49 between the output plate 43 and the output plate 43 comes from the position B (FIG. 5) when the lock is released to the lock position C (FIG. 6) which is substantially symmetrical with respect to the shaft center of the motor 42, The rotation of the output plate 43 is restricted by the first arm 44. At this time, the motor 43 is overloaded and an overcurrent flows accordingly. This overcurrent is detected by an overcurrent detection switch or the like, and the motor 42 is automatically stopped.

[0012]

However, since the overcurrent detection switch generally does not operate until a certain time (about 0.1 to 0.2 seconds) elapses after the overcurrent flowing through the motor 42 reaches a specified value, it is locked. There is a slight time lag from the time when the state is entered until the detection switch is activated to stop the motor 42. During this time, the torque transmitted to the output plate 43 increases, and along with that, the first arm
The tensile force applied to 44 also increases. Especially, since the above-mentioned lock device 41 has a toggle mechanism,
Even if the output of 42 is small, the 1st arm when locked
A large tensile force is applied to 44. As a result, the first arm 4
4, the roller 46 or other members around the first arm 44 is bent, which may cause the connection point 49 between the first arm 44 and the output plate 43 to get over the lock position C. If this happens, the first arm 44 will again
Returns to the direction of releasing the lock, and the function as the lock device is lost.

It is an object of the present invention to provide a lock device capable of automatically stopping the motor in the most effective locked state after the lock is completed.

[0014]

The locking device of the present invention comprises:
An apparatus for opening and closing a window of a cabin having a window frame and having a substantially curved surface from at least the front surface to the ceiling, wherein the apparatus extends between a fully closed position on the front surface of the cabin and a fully open position on the ceiling surface of the cabin. A locking device for locking a window glass, which is provided on a window glass that can be opened and closed along an installed guide rail, comprising a motor, a friction clutch provided on a drive shaft of the motor, and An output plate connected to the drive shaft of the motor via a friction clutch, a stopper portion protruding from the outer peripheral surface of the output plate, and one end of the output plate rotatably attached to the output plate with its one end eccentric from the output shaft. A first arm; a second arm having one end pivotably supported at the other end of the first arm and the other end pivotably supported by the window glass; 2 arms And a roller rotatably supported at a pivot point of the motor and rotatably disposed in the guide rail, and an overcurrent detecting unit for detecting an overcurrent generated in the motor. To do.

[0015]

When the window glass is locked, the motor is driven to rotate the output plate, and the toggle lock device composed of the output plate and the first and second arms presses the window glass against the ceiling to lock it. Even in the locked state, there is a slight time lag between the overcurrent detection means detecting the overcurrent and the operation to stop the rotation of the motor, so the motor continues to be driven until the overcurrent detection means operates. . Therefore, when the torque transmitted to the output plate further increases and reaches the set value in the friction clutch, the friction clutch slips. That is, the torque value when the friction clutch starts to slip is set to be slightly higher than the torque value corresponding to the overcurrent detected by the overcurrent detection means. Therefore, the torque transmitted to the output plate is maintained at a constant value, and malfunction of the lock is prevented. After that, the overcurrent detecting means is activated to stop the rotation of the motor.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lock device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing an embodiment of the lock device of the present invention, FIG. 2 is a sectional view of a drive portion in the lock device of FIG. 1, and FIG. 3 is an operation explanatory view of the lock device of FIG.

Similar to the conventional locking device 41, the locking device 1 of the present invention is installed in an opening / closing device as shown in FIG. 4 to lock the window glass G.

This is, as shown in FIGS.
It has a drive unit 2 and a toggle lock device composed of an output plate 3 driven by the drive unit 2 and two sets of arms 4 and 5.

The drive unit 2 is attached to the upper portion of the window glass G, and has a motor 6, a speed reducer 61 provided above the motor 6, and a friction provided between the speed reducer 61 and the output plate 3. It is composed of a clutch 7. As shown in FIG. 2, the speed reducer 61 includes a drive gear 9 connected to the drive shaft 8 of the motor 6 and a plurality of planet gears that mesh with the drive gear 9.
10, a holding plate 11 that rotatably holds the planetary gear 10, a drive disk 13 on which an internal gear 12 that meshes with the plurality of planetary gears 10 is engraved, and a drive disk 13 that is rotatably supported. It is composed of a ball bearing 14. The friction clutch 7 is composed of a friction plate 15 sandwiched between the drive disk 13 and the output plate 3. The drive disc 13 and the friction plate 15 are penetrated by an output shaft 16 attached to the output plate 3, and then a fastening nut is inserted from the drive disc 13 side to the output shaft 16 via a disc spring 17.
It is concluded by 18. Therefore, the drive disk 13
And the output plate 3 presses the friction plate 15 from both sides with a prescribed force, that is, a force prescribed by the deflection of the disc spring 17. As a result, the output plate 3 normally rotates while being connected to the drive disk 13 via the friction plate 15, but when the transmission torque to the output plate 3 reaches the set value, the drive disk 13 and the friction plate 15 are separated from each other. Slippage occurs between the friction plates 15 and the output plate 3. Therefore, the drive disk 13
The torque transmitted from the to the output plate 3 is maintained below a certain constant value.

Further, the motor 6 is automatically stopped when the overcurrent flowing when an overload is applied is detected by the overcurrent detecting means. In this embodiment, a known overcurrent detection switch 62 is used as the overcurrent detection means.

The output plate 3 is a cam member having a shape in which two right-angled stopper portions (hereinafter, referred to as corner portions) 19 and 20 are integrally formed on the outer circumference of the disc. Output plate 3
Is rotated by the driving force of the motor 6 together with the output shaft 16 in the direction in which the window glass G is locked or in the opposite direction. However, the rotation is stopped when the corner portion 19 or 20 comes into contact with the window glass G. The corner portion 19 is a stopper for the stroke end at the unlocking operation, and the corner portion 20
Is a stopper for the stroke end when the lock is activated.

One end of the first arm 4 is pivotally supported on the output plate 3 at a position eccentric from the output shaft 16. At the other end of the first arm 4, one end of a second arm 5 is swingably supported, and a roller 21 is rotatably supported at the pivot point of the first arm 4 and the second arm 5. It is pivotally supported. The other end of the second arm 5 has a window glass G.
It is swingably attached to the side end of.

Next, the operation of the lock device 1 of the present invention will be described with reference to FIGS. 1 and 3.

FIG. 1 shows the lock device 1 in the unlocked state. In this state, the connection point 22 between the output plate 3 and the first arm 4 is at the position D, and the first arm 4 uses the roller 21 as a fulcrum to ceiling the upper end of the window glass G on the ceiling.
Pushed away from 82. Therefore, the window glass G can be moved along the guide rail 33. Output plate 3 at this time
Is at a position where the corner portion 19 contacts the window glass G.

Next, the motor 6 is driven to rotate the output plate 3 in the direction of arrow E to lock the window glass G. Specifically, when the motor 6 shown in FIG. 2 is driven, the rotational force of the motor 6 is transmitted from the first gear 9 to the planet gears 10 to rotate the drive disk 13. At this time, the drive disk 13, the friction plate 15, and the output plate 3 rotate together without slipping between them. As a result, the output plate 3 rotates in the direction of arrow E as shown in FIG. 1, and the connection point 22 between the first arm 4 and the output plate 3 is on the opposite side of the axis of the output shaft 16 (point F in FIG. 3). ) To rotate. Therefore, the roller 21 and the motor 6 approach each other,
As a result, the upper end of the window glass G is pulled up toward the ceiling 82, pressed against the ceiling 82, and locked (see FIG. 3). When the window glass G is locked in this manner, the output plate 3 stops by contacting the corner portion 20 with the window glass G. However, since there is a time lag in the operation of the overcurrent detection switch 62 as described above, the motor 6 does not stop its rotation at this point. When the torque of the motor 6 rises and reaches a certain set value with the lapse of time, slippage occurs between the drive disk 13 and the friction plate 15 or between the friction plate 15 and the output plate 3, so that Output plate 3
The torque transmitted to is maintained at a set value. Therefore, there is no problem that the connecting point 22 between the output plate 3 and the first arm 4 goes over the lock position F. Then, the operation of the motor 6 is stopped by the operation of the overcurrent detection switch 62. By providing the friction clutch 7 on the drive portion 2 and the corner portion 19 as a stopper on the output plate 3 as described above, the locking device 1 can be reliably stopped in the most effective locked state. Further, when the lock is released, the same effect can be achieved.

Further, the friction clutch 7 adjusts the fastening force of the fastening nut 18 inside the friction clutch 7 so that the output plate 3
It is possible to easily change the set value of the torque when the slip occurs. Therefore, the strength of the lock action of the lock device 1 can be arbitrarily changed.

[0028]

The lock device according to the present invention prevents malfunctions and keeps the automatic stop in the most effective locked state by keeping the increase of the torque transmitted to the output plate at the time of locking to a certain value or less. You can

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a lock device of the present invention.

2 is a cross-sectional view of a drive unit in the lock device of FIG.

FIG. 3 is an operation explanatory view of the lock device of FIG.

FIG. 4 is a schematic explanatory view of a device provided with a conventional locking device developed by the present inventors.

FIG. 5 is an operation explanatory view of a conventional lock device.

FIG. 6 is an operation explanatory view of a conventional lock device.

[Explanation of symbols]

 1 Locking device 2 Drive part 3 Output plate 4 1st arm 5 2nd arm 6 Motor 7 Friction clutch 15 Friction plate 16 Output shaft 19, 20 Corner part 21 Roller 62 Overcurrent detection switch

Claims (1)

[Claims] 1. An apparatus for opening and closing a window of a cabin, which is provided with a window frame and has a substantially curved surface from at least the front surface to the ceiling, in a fully closed position on the front surface of the cabin and a fully open position on the ceiling surface of the cabin. Equipped with a window glass that can be opened and closed along a guide rail extended between
A lock device for locking the window glass, comprising a motor, a friction clutch provided on a drive shaft of the motor, an output plate connected to the drive shaft of the motor via the friction clutch, and the output. A stopper portion projecting from the outer peripheral surface of the plate, and a first arm rotatably attached to the output plate with one end eccentric from the output shaft,
A second arm, one end of which is swingably supported at the other end of the first arm and the other end of which is swingably supported by the window glass, and the first arm and the second arm are pivotally supported. A lock characterized by comprising a roller rotatably supported on a fulcrum and rotatably arranged in the guide rail, and an overcurrent detecting means for detecting an overcurrent generated in the motor. apparatus.