JPH0635560U - Locking device for dead bolt in lock - Google Patents

Abstract

(57) [Abstract] [Purpose] When the door is released, unnecessary protrusion of the lock deadbolt due to mischief, etc. is eliminated, and the door can be reliably closed normally. Prevent damage or deformation of the guard arm. [Structure] A trigger 21 protruding from the front plate 3b of the lock box 3 is provided, and a movable cam 30 is operated by an action cam 29 provided on a support frame 24 of the trigger 21. Bolt 1
0 is held immovably by locking the movable stopper 30 to the slider 9 to which the dead bolt 10 is connected. When the door is closed, the movable stopper 30 is unlocked by the retracting of the trigger 21, and the dead bolt 1
Free the zero displacement.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dead bolt idling prevention device that prevents a child or the like from playing a trick and idling the dead bolt when the door is opened.

[0002]

[Prior art]

 A guard that is slidably displaced by a thumb turn operation inside a lock box attached to a door and a dead bolt that is connected to the slider and protrudes from a front plate, and the dead bolt is pivotally supported by a door frame. A lock, which is guided so as to allow the slider to be displaced upward when the arm is actuated, is shown in Japanese Patent Application No. 4-34474 filed on January 25, 1992 by the applicant. There is.

In such a lock, twisting or twisting between the dead bolt and the guard arm during operation of the guard arm is absorbed by the movement of the dead bolt, so that there is an advantage that the guard arm can be configured by a simple extremely thin plate. is there.

On the other hand, the dead bolt of the lock may be misled by a child or the like when the door is opened, causing the thumb turn to rotate and cause the protrusion (idle motion).

If the dead bolt is left protruding to the locked position or the guard arm operating position when the door is opened, the tip portion of the dead bolt collides with the door frame or the guard arm and not only prevents the door from being normally closed. , The protruding dead bolt may damage the door frame or guard arm.

Particularly, in the case of a thin guard arm, not only the outside of the guard arm is damaged but also the guard arm is deformed to make the operation difficult.

[0007]

[Problems to be Solved by the Invention] This invention intends to solve the above-mentioned inconvenience by preventing the dead bolt from idling when the door is opened. In other words, the purpose is to ensure that the door can be closed and to completely prevent damage or deformation of the door frame and the guard arm due to the collision of the dead bolt.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a slider that is slidably displaced by the operation of a thumbwheel in a lock box attached to a door, and a dead bolt that is connected to the slider and protrudes from a front plate. , The lock is guided by the dead bolt so that the slider can be displaced upward when the guard arm pivotally supported on the door frame is actuated. , Equipped with a trigger that can be pushed in and out from the front plate, and the trigger is always biased in the projecting direction so that it can project from the free side edge of the door when the door is opened. A movable stopper that can be selectively locked to the slider only at the dead bolt retracting position by displacing the cam rearward is provided on the lock box side by urging it in the anti-locking direction. To.

[0009]

[Action]

 When the door is open, the trigger protrudes from the front plate, and the action cam on the support frame at the front position together with the trigger presses the movable stopper against the urging force in the anti-locking direction, The slider is locked by the movable stopper. Here, the dead bolt is held immovably in the retracted position.

On the other hand, in the closed state of the door, the trigger comes into contact with the surface of the door frame facing the front plate and is retracted, and the action cam on the support frame retracting together with the trigger causes the movable stopper to engage with the slider. Release from a stopped state. Here, the dead bolt is free to be displaced in the protruding direction by the thumb turn.

[0011]

Embodiments Embodiments shown in the drawings will be described below. In FIG. 1, reference numeral 1 is a door, 2 is a fixed-side door frame, and 2a is a fitting hole of the door frame 2 into which the dead bolt 10 is fitted.

Reference numeral 3 is a lock box attached to the door 1 with screws 4, and is formed of a box body 3a, a front plate 3b, and a cover plate 3c forming one of the side plates. 3d is a side plate of the lock box body 3a, and 5 is a cylindrical reinforcing piece provided between the side plate 3d and the cover plate 3c.

A thumb turn (not shown) is engaged with a rotary shaft 7 rotatably provided in the lock box 3 from the indoor side, and rotates a cam 8 fixed to the rotary shaft 7.

The cam 8 is composed of a first cam 8a and a second cam 8b that are integrally coupled to the rotary shaft 7, and displaces a slider 9 that is slidable in the horizontal direction with respect to the lock box 3.

A dead bolt 10 is connected to a slider 9 which is a driven member of the cam 8 by a vertical axis 11 which will be described in detail later. The dead bolt 10 in the illustrated example is shown by a solid line in FIG. It is possible to take three positions: a retracted position (unlocked position) 101, a guard arm operating position 102, which is indicated by a chain line, and a locking position 103, which is also indicated by a chain line.

On the other hand, a guard arm 12 for limiting the door 1 to the half-opened state is pivotally supported on the upper portion of the door frame 2 (not shown).

The slider 9 of the illustrated example has a T-shape whose side is substantially horizontal. Both side plates 9a and 9b of the slider 9 are provided with driven notches 91 and 92, respectively, on the upper portions of which the first cam 8a and the second cam 8b engage, respectively. The front portion 9c is formed into a rectangular tube shape.

When the cam 8 is rotated by an operation of the thumb of the thumb, the slider 9 is pushed and moved forward or backward by a distance l, and the dead bolt 10 connected to the slider 9 pulls the dead bolt 10 into the retracted position 101 and the locked position 103. Displace between and.

Reference numeral 13 in the drawing denotes an intermediate positioning device for the slider 9 provided between the side plates 9a and 9b of the slider 9, which is rotatably supported by the side plates 9a and 9b of the slider 9 and has a claw piece at its tip. It comprises an engaging piece 13a having 13b, a torsion spring 13c for urging the engaging piece 13a toward the bottom plate 9d of the slider 9, and an appropriate stopper piece 19 fixed to the side plate 3d of the lock box 3.

The claw piece 13b normally projects downward from an elongated hole (not shown) opened in the bottom plate 9d of the slider by the elastic force of the torsion spring 13c, and the dead bolt 10 extends from the retracted position 101 to an intermediate guard arm. When it reaches the operating position 102, it engages with the stop piece 19 and limits the forward displacement of the slider 9 enclosing the dead bolt 10.

The rearward displacement of the slider 9 at that position is prevented by the abutment of the cam 8 (second cam 8b) and the driven notch 92.

Here, the slider 9 along with the dead bolt 10 is stably stopped in displacement in the front-rear direction at an intermediate guard arm operating position 102, and unnecessary or illegal movement of the dead bolt 10 is prevented.

When the slider 9 advances further forward by the thumb turn, the cam 8 (first cam 8 a) contacts the upper portion of the engagement piece 13 a, and the engagement piece 13 a resists the elastic force of the torsion spring 13 c. Then, the claw piece 13b is disengaged from the stopper piece 19 to allow the slider 9 to move forward.

The dead bolt 10 penetrates an elongated hole 12 a provided in the guard arm 12 at the guard arm operating position 102 and the locking position 103.

When the dead bolt 10 reaches the guard arm operating position 102, the small diameter portion 10 a provided at the tip portion thereof is localized at the portion of the elongated hole 12 a of the guard arm 12.

The small diameter portion 10 a allows tilting of the guard arm 10 connected through the long hole 12 when the door 1 is opened in a half-opened state. Further, the tip end of the dead bolt 10 having an irregular cross section prevents the guard arm 12 from coming out of the elongated hole 12a.

Further, the dead bolt 10 is not displaced upward with respect to the slider 9 connected by the vertical axis 11 so that the dead bolt 10 and the guard arm 12 that tilts when the guard arm is actuated are not gouged or twisted. Is allowed.

The vertical axis 11 is fixed in the slider front portion 9c in the shape of a rectangular tube, and the rear portion of the dead bolt 10 is slidably inserted into the insertion hole 10a.

Therefore, when the dead bolt 10 is projected to the guard arm operating position 102 and the door 1 is opened, the dead bolt 10 is tilted and the elastic force of the compression coil spring 14 wound around the vertical axis 11 is increased. To the upper position 104, which is indicated by the dashed line in FIG.

When the door 1 is closed, the dead bolt 10 returns to its original position by the elastic force of the compression coil spring 14 as the guard arm 12 returns.

The through hole 3e of the dead bolt 10 provided in the front plate 3b is formed in a long hole to allow the dead bolt 10 to be displaced to the upper position 104.

Two shutter plates 16 and 16 guided by the front plate 3 b and the frame plate 15 are provided above the elongated hole 3 e.

The shutter plates 16 and 16 are opened by the dead bolt 10 which is displaced upward as the guard arm 12 tilts, and when the dead bolt 10 returns downward, it descends by its own weight and closes the upper portion of the elongated hole 3e.

It should be noted that reference numerals 17 and 18 denote known click means, which are attached to the cam 8 and the slider 9, respectively. Reference numeral 6 denotes a picking protection plate fixed to the slider front portion 9c.

Next, the configuration of the main part of this invention will be described. Each member of the dead bolt idle motion prevention device is provided, for example, inside a partition frame 20 having a reverse L-shaped side surface fixed at a lower position in the lock box 3.

The trigger 21, which has a tip end portion in which the horizontal projection is chevron-shaped, is arranged so that it can be inserted into an opening 22 formed in the front plate 3 b of the lock box 3.

The rear portion of the trigger 21 is integrally connected to a supporting frame 24 having a U-shaped side surface through a mounting piece 23 having a U-shaped cross section. The trigger 21, the mounting piece 23, and the support frame 24 are fixed by connecting pins 25 and 26, respectively.

The support frame 24 is attached to the front plate by a guide means (not shown) consisting of a protrusion provided on the support frame 24 and a horizontal long hole opened in the side plate 3d of the lock box, or any other guide means. It is slidably guided in the vertical direction.

A frustoconical compression spring 27 for constantly biasing the trigger 21 in the protruding direction is mounted between the rear surface of the support frame and the partition frame 20. Reference numeral 28 is a pin for fixing the compression spring, which is fixed to the supporting frame 24 and also serves as a stopper of the supporting frame 24.

On the support frame 24, an action cam 29 having an inclined edge that descends toward the front on the front plate side and drives a movable stopper 30 described later by a wedge action is integrally or separately provided. Set up.

The movable stopper 30 is adapted to be selectively locked to the slider 9 only when the dead bolt 10 is retracted, and is rotatably supported by a horizontal shaft 31 provided on the side plate 3d of the lock box 3. The torsion spring 32 elastically mounted on the horizontal shaft 31 is always biased in the anti-locking direction (clockwise in FIG. 1). The protrusion 30 a provided on the movable stopper 30 is in sliding contact with the inclined end edge of the action cam 29.

Then, when the door 1 is opened, the trigger 21 protruding from the front plate 3b is displaced forward, and is moved by the wedge action generated between the action cam on the support frame 24 and the protrusion 30a of the movable stopper. The stopper 30 is held at the locking position against the elastic force of the torsion spring 32, and the slider 9 is locked thereby to hold the dead bolt 10 at the retracted position 101. The movable stopper 30 comes into contact with the partition frame 20 when locked and is locked at an appropriate position.

On the other hand, when the door 1 is closed, the trigger 21 comes into contact with the facing surface 2b of the door frame 2 with respect to the front plate 3b of the door 1 and is pushed into the lock box by the wedge action.

At this time, the action cam 29 on the support frame 24 retracts by the distance m against the elastic force of the compression spring 27, so that the movable stopper 30 rotates in the direction of arrow P by the elastic force of the torsion spring 32. , The slider 9 is released from the locked state.

Since the slider 9 is free to move due to the thumb turn, the dead bolt 10 can be advanced to the guard arm operating position 102 or the locking position 103.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified and implemented.

For example, in the embodiment shown in FIG. 1, the working cam 29 connected to the trigger 21 has a beveled edge which is inclined so as to descend toward the front, which is shown in FIG. At the slanted edge of the working cam 29 that slants so as to descend rearward, a stepped portion that pivotally supports the central portion and locks the slider 9 at the front end is formed. The projecting piece 30a at the rear end of the movable stopper 30 biased by the elastic contact is elastically contacted.

Then, the door closing action cam 29 moves rearward (in the direction of arrow Q), and the movable stopper 30 resists its urging force by the wedge action generated between the inclined edge and the projecting piece 30a. It rotates counterclockwise and the slider 9 is released.

[0049]

[Effect of device]

 According to the dead bolt idle motion prevention device of the present invention described above, the projection of the dead bolt by the thumbtangle can be performed only when the door is closed to the door frame, and cannot be performed when the door is opened. As a result, unnecessary protrusion of the dead bolt due to mischief when opening the door can be completely prevented, and the door can always be closed normally, and the door frame and guard arm are damaged or deformed due to the collision of the dead bolt tip. Will be surely prevented.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional side view showing an embodiment of a dead bolt idling prevention device in a lock of the present invention.

FIG. 2 is a front view thereof.

FIG. 3 is a diagram showing a modified embodiment of the present invention.

[Explanation of symbols]

 1 Door 2 Door Frame 2b Opposing Surface 3 Lock Box 3b Front Plate 9 Slider 10 Dead Bolt 21 Trigger 24 Support Frame 29 Working Cam 30 Movable Stopper

Claims (1)

[Scope of utility model registration request] 1. A lock box attached to a door, comprising a slider that is slidably displaced by an operation of a thumb turn, and a dead bolt connected to the slider and protruding from a front plate. The dead bolt is pivotally attached to a door frame. In a lock guided so that the slider can be displaced upward when the supported guard arm is actuated, the lock is held by a support frame that slides and shifts in the lock box so that it can be projected from the front plate. The trigger is always biased in the projecting direction so that it can project from the free side edge of the door when the door is opened, and the dead cam is displaced by the rearward displacement of the action cam provided on the support frame. Of the dead bolt in the lock, characterized in that a movable stopper capable of being selectively locked to the slider only at the retracted position of the lock is biased in the anti-locking direction and provided on the lock box side. Device to prevent empty movement.