JPH04368580A - Electric lock - Google Patents

Abstract

PURPOSE:To easily complete locking and unlocking operations with a duplicate key or thumb-turn for a cylinder lock even when the motor stops its rotation dering the locking and unlocking operations on account of some reason, in an electric lock to transmit the torque of a motor through a reduction gear device to a dead bolt. CONSTITUTION:A gear train to compose a reduction gear device is interposedly provided with an electromagnetic clutch 13, and when turning on electricity to a motor is stopped, turning on electricity to the electromagnetic clutch is also stopped. At the time of power outage, a section from a clutch plate 14 to the final driven gear 6 functioning as a dead bolt operating member is separated from the motor 17, Thus the following execution of locking and unlocking operations using a duplicate key or thumb-turn for a cylinder lock is made possible.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an electric lock that uses a motor as an electromagnetic actuator, and in particular, an electromagnetic clutch is inserted into a speed reducer to facilitate manual locking and unlocking operations, and also to prevent the motor from erroneously operating. This invention relates to an electric lock that can completely prevent burn-in.

0002

2. Description of the Related Art There are various types of electric locking mechanisms, but those in which the deadbolt is directly driven by a motor are often used for doorways of important rooms because they lock securely.

[0003]This type of electric lock is configured to transmit the rotational force of a micromotor or the like to the deadbolt drive mechanism via a reducer such as a worm reducer, and usually the deadbolt drive mechanism is The bolt drive mechanism is connected to the inner cylinder of a mechanical cylinder lock attached to the door for manual operation with a duplicate key.

By the way, if the deadbolt drive mechanism and the reducer are directly connected, in the case of a worm reducer, the drive side cannot be driven from the driven side, so manual operation using the duplicate key is not possible, and In the case of other types of reducers, the motor is dragged and rotated via the reducer during manual operation, so there is a gap between the deadbolt drive mechanism and the reducer, for example, As described in the publication, a disconnection mechanism such as a Geneva mechanism is usually provided.

[0005]

[Problem to be Solved by the Invention] However, an electric lock that uses the above-mentioned motor as an electromagnetic actuator has a strong force for driving the deadbolt, so it has the advantage that the deadbolt can be inserted and removed reliably. , Geneva mechanisms and other conventional disconnection mechanisms either do not operate when the deadbolt is in a position other than the locked or unlocked position, or only operate when the deadbolt moves in one direction, either the locking or unlocking direction. It is something to do.

Therefore, if a power outage occurs while the motor is rotating, that is, while the deadbolt is being moved, there is a problem in that even if the deadbolt is subsequently attempted to be manually operated using a duplicate key, at least one of locking and unlocking may not be possible.

Furthermore, when locking a doorway, if the motor is operated before the door is completely closed, the tip of the deadbolt protruding from the free edge of the door may end up outside the deadbolt slot opening. Hitting the strike plate or door frame,
Thereafter, as the motor continues to rotate, an overload is applied to the motor, and the motor eventually seizes up, which is a problem. Usually, a tapered surface is formed at the tip of the deadbolt of such an electric lock, and some misalignment can be adjusted by a wedge action between this tapered surface and the opening edge of the deadbolt insertion hole of the strike plate. However,
Of course, if the degree of mismatch exceeds the adjustable range, the above-mentioned problems will occur.

[0008] The present invention solves the above-mentioned inconveniences with a simple configuration, and even if there is a power outage during operation of the deadbolt by the motor, the operation of the deadbolt can be easily completed using a duplicate key. An object of the present invention is to provide an electric lock that can completely prevent the motor from seizing even if the motor is operated in a state where the dead bolt insertion port of the strike plate and the strike plate do not align with each other.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the invention as set forth in claim 1 provides a mechanism that is driven by a motor through a speed reducer during locking and unlocking, and whose tip is connected to the front plate of the lock box. A gear train constituting the speed reducer, which has an operating arm that is pivoted to swing in a vertical back-and-forth direction, and a deadbolt whose front end protrudes outward through the front plate when locked. It is characterized in that an electromagnetic clutch is inserted therein, and the electromagnetic clutch is energized when the motor is operated.

[0010] Furthermore, the invention according to claim 2 is such that the lock is driven by a motor through a speed reducer when locking and unlocking, and is rotated so that the tip swings in the front and back direction perpendicular to the front plate of the lock box. and a deadbolt whose front end protrudes outward through the front plate when the lock is locked. A feature is that an electromagnetic clutch is inserted, and the electromagnetic clutch is energized when the motor is operated.

[0011]

[Operation] In the invention as set forth in claim 1 configured as described above, when the door is not completely closed and the motor is operated in a state where the deadbolt and the deadbolt inlet of the strike plate are not aligned, the deadbolt Even if the tip of the motor stops when it comes into contact with the strike plate or door frame, the motor continues to rotate, but its rotational force is absorbed by the slippage of the clutch plate of the electromagnetic clutch.

[0012] Furthermore, in the invention according to claim 2,
In addition to the effect of the invention described in claim 1, if a power outage accident occurs while the deadbolt drive mechanism is in operation, the power supply to the electromagnetic clutch is also stopped, so that the clutch plate of the electromagnetic clutch of the reduction gear is transferred to the motor. The load on the side is disconnected. Therefore, the operating arm is released from the motor, so locking and unlocking operations can be completed using the duplicate key or by turning the thumb.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Incidentally, for convenience of explanation, the invention as claimed in claim 2 will be explained.

In FIG. 1, reference numeral 1 designates a lock box, and within this lock box 1, a deadbolt 2 is guided so as to be movable in the front-back direction perpendicular to the front plate 3 (left-right direction in FIG. 1).

The rear end of this deadbolt 2 engages with an operating arm 4, and the deadbolt 2 engages with this operating arm 4.
It is the same as the conventional one that is driven to move in and out of the front plate 3.

The actuating arm 4 in the illustrated embodiment has an engaging hole 5 in its center and is integrally connected to a final driven gear 6 rotatably supported on the side plate of the lock box 1. extends in the radial direction. In addition, the final driven gear 5
is connected to the inner cylinder of the cylinder lock via a tail piece (not shown) inserted through the engagement hole 5, and to a thumb turn on the inner surface of the door via an engagement piece (also not shown).

The final driven gear 6 includes a first gear 7 and a second gear 7.
A gear 8, a third gear 9 coaxially connected to the second gear 8 and having a larger diameter than the second gear, a fourth gear 10, and the fourth gear 1.
A first bevel gear 11 is coaxially connected to the fourth gear and has a larger diameter than the fourth gear, a second bevel gear 12 has a smaller diameter and is attached to the tip of the output shaft of the electromagnetic clutch 13, and the output of the electromagnetic clutch 13. A micromotor is connected to the shaft through a fifth gear 15, an idle gear 16, and a driving gear 18, which are rotatably engaged with the shaft and are connected to the second bevel gear 12 via a clutch plate 14 when the electromagnetic clutch 13 is energized. It is connected to a motor 17 such as.

It goes without saying that the gear train from the first gear 7 to the driving gear 18 constitutes a speed reducer when viewed from the motor 17.

Although the structure of the electromagnetic clutch 13 is conventionally known, one example of the structure of the electromagnetic clutch will be briefly explained with reference to FIG. 2. In FIG. 2, reference numeral 20 denotes a double cylindrical yoke made of magnetic material, and an electromagnetic coil 21 is wound around the outside of the inner cylindrical portion of this yoke 20. As shown in FIG.

An output shaft 23 made of a non-magnetic material is rotatably supported inside the inner cylindrical portion of the yoke 20 coaxially with the electromagnetic coil 21 and via bearings 22, 22. The second bevel gear 1 is attached to the tip of the output shaft 23 (upper end in FIG. 2).
2 (see FIG. 1) is attached as described above.

A flange 2 made of non-magnetic material is located in the middle of the output shaft 23.
4 is formed, and the fifth gear 15 and a clutch plate 14 (see FIG. 1) made of a magnetic material are coaxially and rotatably engaged with the portion of the output shaft 23 from the collar portion 24 to the tip. ing. Note that the clutch plate 14 is usually a thin leaf spring (
(not shown), the output shaft 23 is integrally connected to the fifth gear 15 by the elastic deformation of the leaf spring in the axial direction of the output shaft 23 (
In other words, it can be moved slightly (downward in FIG. 2).

Since the electromagnetic clutch 13 is configured as described above, when the electromagnetic coil 23 is energized,
The magnetic flux generated in the electromagnetic coil passes through a magnetic circuit consisting of the inner cylindrical portion, bottom surface, outer cylindrical portion of the yoke 20, and the clutch plate 14, but at this time, the clutch plate 14 is attracted to the yoke 20 side in an attempt to minimize magnetic resistance. . Therefore, the clutch plate 14 is pressed against the flange 24, and the second bevel gear 12 and the fifth gear 15 are interconnected through the frictional engagement that occurs between the clutch plate 14 and the flange 24.

In FIG. 1, reference numeral 25 indicates a push-up piece. The push-up piece 25 is guided so as to be movable up and down in FIG.
The elasticity of the compression coil spring 27 biases it in the direction of contacting the tip of the actuating arm 4.

This push-up piece 25 is connected to the electromagnetic clutch 13.
When power is cut off and the gear train from the final driven gear 6 to the second bevel gear is separated from the motor 17, the actuating arm 4 becomes unstable and falls into the actuating notch 26, resulting in
As shown in the figure, even if the deadbolt 2 protrudes from the front plate 3, it is provided to eliminate the fear that the lock will be unlocked if the deadbolt is pushed into the lock box 1 by some means. By constantly pushing it up, the locking and unlocking positions of the operating arm 4 are maintained stably. However, although such concerns are theoretically possible, in reality the angular position of the gear train is kept stable by friction. In other words, this push-up piece 25 is provided just in case, and is not an essential component of the present invention.

The electric lock according to the invention as set forth in claim 2 configured as described above energizes the motor 17 and the electromagnetic clutch 13 when locking and unlocking, and amplifies the rotational force of the motor 17 by the speed reducer. The signal is transmitted to the final driven gear 6, and the lock is locked by rotating the gear clockwise, or the lock is unlocked by rotating the gear counterclockwise.

The rotation of the final driven gear 6 causes the operating arm 4 to swing back and forth, and its tip engages the operating notch 26 of the deadbolt 2, causing it to protrude and retract from the front plate 3. At this time, the push-up piece 25 moves up and down in the operating notch 26.

During locking and unlocking operations, if the power to the motor 17 is cut off due to a power outage or failure of the power supply or control device, the power to the electromagnetic clutch 13 is also cut off at the same time. The gear train from the final driven gear 6 to the second bevel gear 12 is disconnected from the motor 17. Therefore,
Since the final driven gear 6 is released from the motor 17 and becomes free, locking and unlocking operations can be completed using a duplicate key or a thumb turn.

Furthermore, if the locking operation of the electric lock is started before the door is completely closed, the motor burns out in the conventional electric lock as described above, but in the electric lock according to the present invention, the dead bolt 2 When the motor 17 is rotated in the locking direction with the motor 17 being stretched against the strike plate or door frame, the clutch plate 14 and flange 24 of the electromagnetic clutch 13 (Fig. 2
Since slippage occurs between the motors (see ) and the motor is no longer overloaded, the motor will not burn out.

[0029] Even if the motor 17 is not burnt out at this time, it does not mean that the motor continues to rotate unnecessarily. Therefore, although this is not an essential component of the present invention, for example, as shown in FIG. Therefore, it is desirable to configure the control circuit so that an alarm is issued if the lock confirmation switch 28 is not driven within a certain period of time after the motor 17 starts rotating in a predetermined direction.

[0030] Furthermore, the invention according to claim 1 is obtained by omitting the connection mechanism of the final driven gear 6 to the cylinder lock or thumb turn from the configuration of the invention according to claim 2, and the configuration and Since the effect is obvious, further detailed explanation will be omitted.

[0031]

Effects of the Invention As is clear from the above description, the present invention provides an operation for driving a reduction gear, that is, a deadbolt. An electromagnetic clutch is inserted in the gear train from the final driven gear that forms the arm to the motor, and this electromagnetic clutch is energized when the motor is activated for locking and unlocking.
Even if the motor is turned in the locking direction before the door is completely closed, the clutch plate of the electromagnetic clutch will slip and the motor will not be overloaded, so there is no need to worry about this with conventional electric locks. This has the effect of completely preventing the motor from burning out.

[0032] Furthermore, in the invention according to claim 2,
The final driven gear that connects the operating arm as one unit is connected to the cylinder lock or thumb turn, so if the motor is rotating for locking or unlocking, there is a possibility that the motor may be damaged due to a power outage or failure of the power supply or control device. When the power is cut off,
At the same time, the power to the electromagnetic clutch is cut off, so that the final driven gear is freed from the restraint of the motor. Therefore, locking and unlocking operations can be completed by using the duplicate key of the cylinder lock or by turning the thumb.

Furthermore, the mechanical structure is simplified,
This has various effects such as ease of manufacturing including assembly.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a main part of an electric lock according to an embodiment of the invention as set forth in claim 2;

FIG. 2 is a sectional view showing an example of the structure of an electromagnetic clutch.

[Explanation of symbols]

1 Lock box 2 Deadbolt 3 Front plate 4 Actuation arm 6 Final driven gear 13 Electromagnetic clutch 14 Clutch plate 17 Motor 24 Tsuba

Claims (2)

[Claims] Claim 1: An operating arm that is driven by a motor via a speed reducer when locking and unlocking, and whose tip is rotated so as to swing in a front-rear direction perpendicular to the front plate of the lock box, and a front end when locking. has a dead bolt that penetrates the front plate and protrudes outward, and an electromagnetic clutch is inserted into the gear train constituting the reduction gear, and the electromagnetic clutch is energized when the motor is operated. An electric lock featuring [Claim 2] When locking and unlocking, the lock is driven by a motor through a speed reducer, and the tip is rotated so as to swing in the front and back direction perpendicular to the front plate of the lock box, and the lock is attached to the inner cylinder of the cylinder lock. In a device having a connected operating arm and a deadbolt whose front end protrudes outward through the front plate when locked, an electromagnetic clutch is inserted into the gear train constituting the reduction gear, and the motor is actuated. An electric lock characterized in that the electromagnetic clutch is energized when the electromagnetic clutch is turned on.