JP5124840B2 - Motor protection mechanism for motor-driven electric lock - Google Patents

Description

  The present invention relates to a motor protection mechanism (hereinafter simply referred to as a motor protection mechanism) for a motor-driven electric lock, and in particular, a motor capable of making a motor-driven electric lock compact by reducing the size of a dead bolt that is a locking member. The protection mechanism.

  There are various types of locking mechanisms for electric locks. Particularly, those that drive a dead bolt with a motor are frequently used as doorways in important rooms because they are surely locked.

  Thus, this type of electric lock is configured to transmit the rotational force of an electric motor such as a micro motor to a dead bolt drive mechanism via a speed reducer, and the force for driving the dead bolt is strong. Become.

  On the other hand, when locking the doorway, for example, if the closer is not completely pushed through the packing of the hermetic chamber, in other words, if the motor is operated with the door not fully closed, the tip of the dead bolt will strike. Since the dead bolt stops at the opening edge of the hole, there is a disadvantage that the motor burns out.

  This inconvenience also occurs when, for example, the door warps due to aging, and the free side edge of the door deviates from the normal position.

  In view of this, the present applicant has previously proposed an electric lock in which a spring is interposed between a dead bolt driving member and a dead bolt using Patent Document 1 described later.

  This electric lock is configured to drive a dead bolt via a spring, and even if the dead bolt hits the opening edge of the strike hole and stops, the dead bolt drive mechanism only deforms the spring thereafter. Therefore, motor burnout accidents can be prevented.

In addition, the applicant of the present invention, as described in Patent Document 2 below, forms a dead bolt with a sheath tube and a locking rod that is slidably housed therein, and a spring is installed between the dead bolt and the dead bolt. We proposed a dead-bolt structure for motor-driven electric locks that can prevent a motor burnout accident by causing the dead-bolt drive mechanism to elastically deform the spring even if the bolt hits the opening edge of the strike hole and stops.
Japanese Patent Publication No. 03-058430 Japanese Patent Application No. 2006-038603

  However, in the inventions described in Patent Documents 1 and 2, both dead bolts have a double structure, and a spring member is elastically mounted on the inside, so the size of the dead bolt inevitably increases. There is still room for improvement, such as the size of the motor-driven electric lock cannot be reduced, especially the lock box cannot be thinned.

  Accordingly, an object of the present invention is to provide a motor protection mechanism capable of reducing the width of the dead bolt and thinning the lock box of the motor-driven electric lock.

In order to achieve the above object, the invention according to claim 1 is directed to a deadbolt that is guided in a lock box so as to be movable in the front-rear direction perpendicular to the front plate, and that has a driven notch formed at the rear end thereof. A drive arm that is disposed in the box in the vicinity of the dead bolt and engages with the driven notch, and a sector gear that meshes with a drive gear connected to an electric motor via a speed reducer, and rotates the drive arm. And having a dead cam that causes the dead bolt to protrude and retract from the front plate through a driven notch engaged therewith, the sector gear and the drive arm are connected to each other so as to be rotatable independently of each other. along the spring member between and elastically mounted, as when locking sector gear to drive the driving arm via a spring member, whereas, in the longitudinal direction in the front end portion of the deadbolt A notch Te, the rear end respectively are opened guide groove, the other, extending in the longitudinal direction along both sides of the dead bolt, external dimensions in the horizontal direction is smaller pair than the width of the strike hole The adjustment plate is provided so as to be movable in the length direction of the dead bolt, and the front ends of the pair of adjustment plates are integrally coupled by a bridge piece slidably engaged with the notch, and the rear end portion is connected to the guide groove. A pair of adjusting plates integrally connected by a slidably engaging connecting pin, and a pair of adjusting plates integrally connected by the bridge piece and the connecting pin are urged forward relative to the dead bolt. When the locking adjustment plate can be inserted into the strike hole and both are aligned, the dead bolt and adjustment plate are both inserted into the strike hole, and the dead bolt is slightly displaced in the horizontal direction with respect to the strike hole. Although it can be thrown into the strike hole, when the adjustment plate is caught by the opening edge of the strike hole, the adjustment plate is left at the position where it abuts the strike plate, and the dead bolt is thrown into the strike hole. And

  In the motor protection mechanism according to the first aspect of the present invention configured as described above, when the sector gear rotates in a state where the dead bolt and the strike hole are displaced in the horizontal direction, the dead bolt is placed on the strike plate of the door frame. Even if the sector gear rotates with the driving arm stopped, in other words, the rotation is consumed only to elastically deform the spring member, so no overcurrent flows through the motor. Therefore, the desired effect of completely preventing motor burnout accidents can be achieved.

  In this case, if the patrol person passing through the door mouth pushes the door in the closing direction, the dead bolt and the strike hole are aligned in the horizontal direction, so the drive arm pushes the dead bolt forward by the elasticity of the spring member, and the dead bolt Can be introduced into the strike hole.

  The invention according to claim 1 is the horizontal dimension, i.e., width, of the strike hole by the thickness of the pair of adjusting plates disposed on both sides of the dead bolt, i.e., twice the thickness of each adjusting plate. Can be set large.

  Therefore, even if the dead bolt contacts the opening edge of the strike hole, the adjustment plate will contact the opening edge of the strike hole, and the locking is completely achieved by first inserting the dead bolt into the strike hole. Can be.

  Even in this case, if the patrol person pushes the door in the closing direction, the adjustment plate and the strike hole are aligned in the horizontal direction, so that the adjustment plate protrudes forward by the elasticity of the spring member and engages with the strike hole. You can enter.

  The drive arm and the sector gear are divided so that they can be rotated independently of each other, and the spring member is elastically mounted in a space that has not been used in the prior art. It is no longer necessary to incorporate a spring member into the dead bolt as in the invention described in, and the thickness of the dead bolt can be reduced correspondingly, and the lock box can be slimmed. Even when the bolt comes into contact with the opening edge of the strike hole, the lock can be completely achieved by first inserting the dead bolt into the strike hole.

An embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a lock box of a motor-driven electric lock, and a dead bolt 2 indicated by an elongated rectangle is movable in the front-rear direction perpendicular to the front plate 3 of the lock box. In other words, it is guided from the front plate 3 so as to be able to appear and disappear.

  As shown in FIG. 2, the dead bolt 2 in the illustrated embodiment includes a sheath body 4 having a reverse U-shaped cross section, and a core body that is held by the sheath body 4, for example, by stacking three plate members. It consists of five.

  Further, as clearly shown in FIG. 5, a notch 6 is formed in the front end portion of the dead bolt 1 composed of the sheath body 4 and the core body 5 so as to penetrate these in the horizontal direction. The left end common to the sheath body 4 and the core body 5 of the notch 6 is indicated by reference numerals in FIG.

  Further, as shown in FIG. 5, a reinforcing plate 8 is caulked to the tip of the dead bolt, but this reinforcing plate 8 is not shown in FIG.

  Furthermore, as shown in FIG. 1, a driven notch 9 is formed on the lower side of the rear end portion of the dead bolt 2. Driving in the left-right direction in FIG. 1 is the same as the conventional dead bolt driving mechanism.

  On the other hand, as shown in FIG. 1, a so-called dead cam is disposed below the dead bolt 2.

  The dead cam includes a sector gear 13 that meshes with a drive gear 12 connected to an electric motor via a reduction gear (not shown), and the drive arm 11.

  Further, the dead cam in the illustrated embodiment has a clutch hole 14 that is linked to a cylinder lock (not shown) and / or a thumb turn on the indoor side at the center.

  In a normal dead cam, the drive arm 11 and the sector gear 13 are integrally coupled. However, in the present invention, these are coupled so as to be able to rotate independently of each other.

  In the illustrated embodiment, as shown in FIG. 2, the arc-shaped sector gear 13 is connected to the holder by caulking so as to be sandwiched between the openings of the pair of cup-shaped holders. An unnumbered cup-shaped guide member integrally connecting the drive arms is fitted in the space so as to be rotatable independently of the holder.

  A spring member 15 as a compression coil spring is elastically mounted in the inner space of the pair of holders that are hollow in a normal locking mechanism.

  One end of the spring member 15 is hooked to the holder, and the other end is hooked to an unnumbered cup-shaped guide member integrally connected to the drive arm. With respect to the drive arm 11, the click engagement portion 16 having the angled tip is urged counterclockwise, in other words, the drive arm 11 and the click engagement portion 16 are urged to be close to each other.

  On the other hand, as shown in FIGS. 1 to 3, on both sides of the dead bolt 2, a pair of adjustment plates 17 and 17 extending in the front-rear direction are supported and guided so as to be movable in the same direction.

  That is, the front ends of the pair of adjusting plates 17 and 17 are integrally coupled by a bridge piece 18 (see FIG. 2), and the other end is a connecting pin 21 that passes through a horizontally long guide groove 19 formed in the rear end portion of the dead bolt 2. Are integrally connected with each other.

  A biasing spring 22 as a compression coil spring is elastically mounted between the bridge piece 18 (see FIG. 2) and the left end 7 (see FIG. 5) of the notch.

  In FIG. 4, reference numeral 23 denotes a lock lever, and reference numeral 24 denotes a control plate thereof. However, these are not related to the present invention, so that further detailed description is omitted.

  In the motor protection mechanism according to the second aspect configured as described above, the dead bolt 2 is retracted when unlocked, as shown in FIG.

  The bridge piece 18 of the adjustment plate is in contact with the rear side of the reinforcing plate 8 by the elasticity of the biasing spring 22.

  When the sector gear 13 is rotated clockwise through the drive gear 12 for locking, when the adjusting plate 17 can be inserted into the strike hole and they are aligned, as shown in FIG. The sector gear 13 rotates integrally in the clockwise direction, and both the dead bolt 2 and the adjustment plate 17 are put into the strike holes.

  On the other hand, when the dead bolt 2 and the strike hole are greatly displaced in the horizontal direction, as shown in FIG. 4, the front end of the dead bolt 2 is stopped by the opening edge of the strike hole. And the drive arm 11 remain in the locked position, and only the sector gear rotates clockwise by a predetermined angle.

  Therefore, as described above, the overcurrent does not flow through the motor and the burnout accident is prevented.

  On the other hand, the dead bolt 2 slightly deviates from the strike hole, and the dead bolt 2 can be thrown into the strike hole. However, when the adjustment plate 17 is caught on the opening edge of the strike hole, as shown in FIG. The dead bolt 2 is thrown into the strike hole, leaving 17 at the position where it abuts the strike plate.

In this case, as described above, the adjustment plate 17 is automatically put into the strike hole by the elasticity of the biasing spring 22 by pushing the door slightly in the closing direction.

1 is a partial cross-sectional side view showing a main part of a motor protection mechanism according to an embodiment of the present invention, showing an unlocked state. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional side view showing a main part of a motor protection mechanism according to an embodiment of the present invention, showing a locked state. The partial cross section front view which shows the principal part of the motor protection mechanism by one Example of this invention. FIG. 2 is a partial cross-sectional side view similar to FIG. 1, showing a state in which a dead bolt and a strike hole are largely displaced and the dead bolt is in contact with an opening edge of the strike hole. FIG. 2 is a partial cross-sectional side view similar to FIG. 1, showing a state where a dead bolt and a strike hole are slightly shifted and the adjustment plate is in contact with an opening edge of the strike hole.

DESCRIPTION OF SYMBOLS 1 Lock box 2 Dead bolt 3 Front plate 4 Sheath body 5 Core body 6 Notch 7 Left end of notch 8 Reinforcement plate 9 Driven notch 11 Drive arm 12 Drive gear 13 Sector gear 14 Clutch hole 15 Spring member 16 Click engagement part 17 Adjustment plate 18 Bridge piece 19 Guide groove 21 Connecting pin 22 Biasing spring

Claims (1)

A dead bolt that is guided so as to be movable in the front-rear direction perpendicular to the front plate in the lock box, and has a driven notch formed in the rear end thereof, and is disposed in the lock box in the vicinity of the dead bolt, and the driven notch A drive arm that engages and a sector gear that meshes with a drive gear that is connected to an electric motor via a speed reducer, and by rotating the drive arm, dead bolts are connected via a driven notch that engages with the drive gear. In the case of having a dead cam protruding and retracting from the front plate, the sector gear and the drive arm are rotatably connected to each other, and a spring member is mounted between them, and the sector gear is locked when locked. so as to drive the driving arm via the one hand, a notch along its length to the front end of the deadbolt, respectively are opened guide groove at the rear end portion, Write extends in the longitudinal direction along both sides of the dead bolt, movable in the horizontal direction of the external dimensions small pair of adjusting plates than the width dimension strike holes in the dead bolt in the longitudinal direction, these The front ends of the pair of adjustment plates are integrally coupled by a bridge piece slidably engaged with the notch, and the rear end is integrally coupled by a connecting pin slidably engaged with the guide groove, Further, the pair of adjustment plates integrally connected by the bridge piece and the connecting pin are urged forward relative to the dead bolt so that the adjustment plates can be inserted into the strike holes when locked. The dead bolt and adjusting plate are both put into the strike hole, and the dead bolt is slightly displaced in the horizontal direction with respect to the strike hole, and the dead bolt can be put into the strike hole. If caught at the opening edge of the hole, leaving the adjustment plate in a position in which it contacts the strike plate, the motor driving the electric lock of the motor protection mechanism, characterized in that so as to put the dead bolt to strike hole.

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