JP2517039Y2 - Electric lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electric lock that is locked and unlocked by retracting a dead bolt.

[Conventional technology]

In an electric lock that locks the door by protruding and retracting the dead bolt by the rotation of the motor and locking the door with the protruding dead bolt, if the door is a double door, side pressure is applied to the dead bolt due to wind pressure. If the dead bolt and the receiving hole are not aligned, the motor may be overloaded and burned out.

In order to prevent such an accident, there is one in which the motor is not burdened when the dead bolt is overloaded while appearing and retracting (see Japanese Patent Laid-Open No. 61-246479).

According to the technique described in the publication, as shown in FIG. 6, the dead bolt 3 provided so as to be retractable from the front plate 2 of the lock box 1 has a hollow structure, and the operating member is provided inside the dead bolt 3. 4 is slidably provided, a spring 5 is inserted between the tip of the operating member 4 and the inner wall surface of the tip of the dead bolt 3, and the dead cam pivotally attached to the lock box 1 and rotated by the rotation of the motor. 6 is an electric lock in which an operating arm 8 that engages with a driven notch 7 formed in the operating member 4 is provided at the tip of 6.

The dead cam 6 is provided with an engagement hole 9 on the outdoor side, into which a shaft connected to a cylinder lock and a thumb turn on the indoor side is inserted, and the dead cam 6 is mechanically rotated by key operation or thumb turn operation of the cylinder lock. It can also be locked and unlocked.

In electrical locking, when the motor receives a locking signal from the outside and rotates in the locking direction, the dead cam 6 to which the rotational force is transmitted via the gear rotates in the clockwise direction, and the operating member is pushed by the operating arm 8. 4 slides in the protruding direction of the dead bolt 3, the operating member 4 pushes the inner wall surface of the tip of the dead bolt 3 via the spring 5, and the dead bolt 3 projects, but the dead bolt 3 is overloaded. Even when it is stopped, the actuating member 4 is driven while compressing the spring 5, so that the motor is not overloaded.

Thus, although the motor is protected, such an electric lock has the following problems.

[Problems to be solved by the device]

Since the accommodation space for the actuating member 4 and the sliding space are required inside the dead bolt 3, and the spring 5 is accommodated in the sliding direction of the actuating member 4, the dead bolt 3 is inserted from the driven notch 7 of the actuating member 4. The length to the tip of becomes longer.

Therefore, there is a problem that it is difficult to apply to a door having a small size (backset amount) 1 from the dead cam 6 having the operation arm 8 engaged with the driven notch 7 to the front plate 2.

Further, since the dead bolt 3 has a hollow structure, there is a problem that the strength is insufficient, and it is necessary to prevent a mechanical locking / unlocking operation from interfering with an electric locking / unlocking mechanism such as a motor.

The present invention is intended to solve such a problem, and even for a door with a small backset amount, the dead bolt does not have insufficient strength, the overload of the motor is reliably prevented, and the mechanical solution is provided. An electric lock that protects an electric locking / unlocking mechanism such as a motor when a lock is operated.

[Means for solving the problem]

In order to achieve the above object, an electric lock of the present invention includes a dead bolt which is provided so as to be retractable from a lock case and has a recess for pushing, a cylinder lock pivotally attached to the lock case, and a thumb turn on the indoor side. A drive cam having an engagement hole into which a shaft to be connected is inserted and an operating piece engaged with the pushed recess, and a set cam pivotally attached to the drive cam and provided with a fan gear on a part of the outer peripheral surface thereof. A spring wound around the drive cam and having one end locked to the drive cam and the other end locked to the set cam, and one set locked to the set cam and the other end locked to the lock case to lock the set cam. And a spring for urging the unlocked position, a motor provided in the lock case for rotating and stopping by an external signal, and a series of gears for transmitting the rotation of the drive gear fixed to the output shaft of the motor to the sector gear. Flock and above A face clutch is biased in the direction of cutting rotation transmission gear group was constituted by the surface cam pushing in a direction of connecting the face clutch when the motor rotates.

[Action]

The operation of the electric lock configured as described above is as follows.

When the motor rotates in response to a lock signal from the outside, the surface cam pushes in the direction to connect the surface clutch, the rotation of the motor is transmitted to the set cam via the drive gear and a series of gear groups, and the rotation is the drive cam. The dead bolt that is transmitted to the drive cam through the spring wound around the drive cam and that engages with the operating piece of the drive cam protrudes or retracts.

When the dead bolt is stopped due to an overload during the protrusion, the rotation of the drive cam that engages with the dead bolt is also stopped, but the set cam rotates as it is due to the deformation of the spring wound around the drive cam. Therefore, the motor for driving the set cam is not burdened.

Since the surface clutch is disengaged when the motor stops, no load is applied to the motor during the mechanical locking / unlocking operation.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of an electric lock with a cover removed. A front case 12 and a second front side 13 are fixed to a lock case 11 attached to an end of a door by screws or the like, and an end wall on the front side of the case 11. Make up.

Holes 14 drilled in front 12 and second front 13
A long hole 16 is provided in a dead bolt 15 inserted in the lock bolt 11, a dead guide pin 17 standing on the side wall 11a of the lock case 11 is loosely fitted in the long hole 16, and a guide roller 18 provided on the side wall 11a is dead. Abut the upper surface of the bolt 15.

Therefore, the tip of the dead bolt 15 can be projected and retracted from the front 12.

A substantially rectangular recess 19 for pushing is formed in the lower portion of the rear portion (right side in FIG. 1) of the dead bolt 15.

As shown in FIG. 3, the drive cam 20 includes a lock case 11
The flange portion 24 is provided at one end of the tubular portion 23 that is inserted into the hole 35a of the cam holder 35 that is attached to, and the fitting step portion 25 is provided around the tubular portion 23 side surface of the flange portion 24. A cylindrical portion (not shown) that is inserted into the hole 36a of the cam holder 36 that is attached to the lock case 11 is provided on the back surface, and an operating piece 26 that engages with the pushed recess 19 is provided on the outer peripheral surface of the collar portion 24. The engagement hole 27 is provided in the inner peripheral surface of the tubular portion 23, and the shaft (not shown) connected to the cylinder lock on the outdoor side and the thumb turn on the indoor side is fitted into the engagement hole 27.

The set cam 21 has a fan-shaped gear 29 and a projecting wall 30 projecting from the outer peripheral surface of the tubular part 28, a spring locking groove 31 is formed at the end of the projecting wall 30, and a spring locking part is formed on the lower surface of the projecting wall 30. 32 are provided.

The inner peripheral surface of the tubular portion 28 is pivotally attached to the outer peripheral surface of the fitting step portion 25, and an annular gap is formed between the inner peripheral surface of the tubular portion 28 and the outer peripheral surface of the tubular portion 23. A spring 33 wound around 23 is inserted into this annular gap, one end 33a of the spring 33 is locked in a spring locking hole 34 formed in the side surface of the engaging stepped portion 25, and the other end 33b is spring engaged. It is locked in the stop groove 31.

Further, the other end of the spring 37, one end of which is locked to the spring locking portion 32, is locked to the pin 38 provided on the lock case 11 (see FIG. 1).

Therefore, the drive cam 20 is urged by the spring 33 in the direction in which the operating piece 26 abuts the protruding wall 30, and the set cam 21 is
The spring 37 allows the locked position (see FIG. 2) and the unlocked position (first position).
(See the figure).

Motor 39 with reducer installed inside the lock case 11
A drive gear 40 including a worm gear is fixed to the output shaft of the drive gear 40, and the drive gear 40 is connected to a series of gears described below.

A thrust bearing 42, an annular cam 43, and a drive-side gear 44 that meshes with the drive gear 40 are fitted and inserted into a support shaft 41 provided upright on the side wall 11a of the case 11 (see FIG. 4).

On the upper surface of the ring-shaped cam 43, three peaks are arranged along the circumferential direction.
45a and three valleys 45b are alternately arranged, and a surface cam 45 having a slope 45c formed between the peaks 45a and the valleys 45b is provided, and a cam surface 46 of the same shape is formed on the lower surface of the drive side gear 44. The drive side gear 44 is provided with a surface clutch 47 on the upper surface thereof.
A tubular portion 49 is provided inside of the through a groove 48.

The driven side gear 50 is annularly inserted on the outer peripheral surface of the tubular portion 49, and the surface clutch 47 of the same shape that can be fitted into and disengaged from the surface clutch 47 is attached to the lower surface of the driven side gear 50 (see FIG. 5 (a)). Is provided and a spring 52 is elastically mounted between the driven gear 50 and the annular groove 48, and between the driven gear 50 and the cover 57 of the lock case 11 (see FIG. 5A). A thrust bearing 53 which is annularly inserted into the support shaft 41 is inserted.

Therefore, the drive side gear 44 is pushed to the lowered position, and the surface cam
The crests 45a of 45 are in contact with the valleys of the cam surface 46, but the surface clutches 47 and 51 are disengaged.

The driven shaft gear 50 is attached to the gear shaft 54 erected on the lock case 11.
A small gear 55 meshing with the small gear 55 is pivotally attached, and a large gear 56 integrally provided on the small gear 55 meshes with the sector gear 29.

Therefore, the drive side gear 44 rises and the surface clutches 47 and 51 are
When the gears mesh with each other (see FIG. 5 (b)), a series of gear groups for transmitting the rotation of the drive gear 40 to the sector gear 29 by the drive-side gear 44, the driven-side gear 50, the small gear 55, and the large gear 56. Is configured.

 The operation of the electric lock configured as described above will be described.

Since the motor is stopped, the drive-side gear 50 in the series of gears is pushed by the spring 52 to the down position and the cam 43
The surface cam 45 and the cam surface 46 of the drive side gear 50 are in mesh with each other, and the surface clutch 47 of the drive side gear 50 and the surface clutch 51 of the driven side gear 50 are disengaged (see FIG. 5 (a)). .

When the motor 39 rotates in response to a lock signal from the outside,
The drive-side gear 44 that meshes with the drive gear 40 rotates counterclockwise in FIG. 1, and the ridges of the cam surface 46 form the slope 45c of the surface cam 45.
Since the drive side gear 44 rises, the surface clutches 47, 51 engage with each other, and the drive side gear 44 further rotates, the drive side gear 44, the cam 43, and the driven gear 50 are integrated. It rotates (see FIG. 5 (b)), the small gear 55 and the large gear 56 rotate clockwise, the sector gear 29 rotates counterclockwise, and the dead bolt 15 projects from the front 2, The lock is locked (see FIG. 2 (A)).

When the motor 39 rotates in the opposite direction, the fan gear 29 rotates clockwise and the dead bolt 15 sinks into the front 2,
The electric lock is unlocked (see FIG. 1).

If you try to lock the door when the double-opening door is displaced by the wind pressure or because the door that the dead bolt 39 engages is displaced with respect to the dead bolt 39 because the door is not completely closed, the dead bolt While 39 is protruding, the dead bolt 39 may stop by hitting the frame side.

When the dead bolt 39 stops, the drive cam 20 in which the operating piece 26 engages with the pushed recess 19 of the dead bolt 39 stops.

On the other hand, the set cam 21 to which the rotation of the motor 39 is transmitted is
The spring 33 wound around the tubular portion 23 of the drive cam 20 is pushed and rotated to the locking angle (see FIG. 2B).

Therefore, the motor 39 is not overloaded even if it is rotated by a predetermined amount as it is, and there is no possibility of causing a burnout accident or the like.

In the case of the mechanical locking / unlocking operation, even if the drive cam 20 is directly rotated by the key operation of the cylinder lock or the thumb turn operation, the surface clutches 51 and 47 are not engaged, so the electric locking / unlocking mechanism of the motor 39 or the like. Is protected.

[Effect of device]

 The present invention is configured as described above.

(1) The mechanism for protecting the motor can be compactly assembled by the set cam and the spring attached to the drive cam.

Therefore, the electric lock of the present invention does not reduce the strength of the dead bolt even if the door has a small backset amount.
It is possible to reliably prevent overload of the motor.

(2) In a gear group that transmits the rotation of the motor to the drive cam, a surface clutch that is urged in the direction of cutting the rotation transmission is provided, and the surface cam that pushes in the direction of connecting the surface clutch only when the motor rotates. Since the lock and unlock mechanism is provided, there is an advantage that the mechanical locking / unlocking operation can be easily performed with a small torque, and an electric locking / unlocking mechanism such as a motor is protected during the mechanical locking / unlocking operation.

[Brief description of drawings]

1 to 5 (a) and (b) show an embodiment of the present invention, and FIG. 1 is a front view of the unlocked electric lock when the cover is removed, and FIG. 2 (a) and FIG. (B) is a front view of the essential parts of the electric lock showing a state in which the dead bolt is completely projected and stopped in the middle of the projection, FIG. 3 is a perspective view of parts constituting the cam plate, and FIG. 4 shows a series of gear groups. 5 (a) and 5 (b) are operation explanatory views of the cam and the surface clutch, and FIG. 6 is a longitudinal sectional view of essential parts of the conventional electric lock. 11 …… Lock case, 12 …… Front, 15 …… Dead bolt, 19 …… Recessed recess, 20 …… Drive cam, 21 ……
Set cam, 23 …… Cylinder part, 24 …… Flange part, 25 …… Mating step part, 26 …… Operating piece, 27 …… Engaging hole, 28 …… Fan-shaped gear, 33
...... Spring, 35,36 …… Cam holder, 37 …… Spring, 39 ……
Motor, 40 …… Drive gear, 41 …… Spindle, 43 …… Cam, 44
...... Drive side gear, 45 …… face cam, 46 …… cam face, 47,51
...... Surface clutch, 50 ...... Driven side gear, 52 ...... Spring, 55
...... Small gear, 56 …… Large gear.

Claims (1)

(57) [Scope of utility model registration request] 1. A dead bolt having a recess for pushing, which is provided so as to be retractable from a lock case, and an engagement hole into which a shaft which is pivotally attached to the lock case and is connected to a cylinder lock on the outside and a thumb turn on the inside is inserted. And a drive cam having an operating piece that engages with the driven recess, a set cam pivotally attached to the drive cam and provided with a sector gear on a part of the outer peripheral surface thereof, and one end of the set cam wound around the drive cam. A spring whose other end is locked to the set cam on the drive cam, and a spring which has one end locked on the set cam and the other end locked on the lock case to urge the set cam to the locking and unlocking positions. , A motor that is installed in the lock case and rotates and stops by an external signal,
A series of gear groups for transmitting the rotation of the drive gear fixed to the output shaft of the motor to the sector gear, a surface clutch biased in the direction of cutting the rotation transmission of the gear group, and a rotation of the motor. An electric lock comprising a surface cam that pushes in the direction in which the surface clutch is connected.