JP2878657B2 - Flat latch lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a flat latch lock which is an empty lock used for doors of ordinary houses, apartment houses, companies and the like.

[0002]

2. Description of the Related Art In general, a conventional empty lock has only a latch or the like, and has no dead bolt, and the opening and closing direction of a door is determined in one direction. Further, the latch bolt has a triangular pointed tip, and is spring-biased in a direction protruding from the lock box. For this reason, when the door is opened, it always projects from the end of the door due to the spring force, and the clothes are caught dangerously. In particular,
When used for bathroom doors, it was dangerous.

For this reason, there has been proposed a system in which a magnet is provided on the strike side, and only when the door is completely closed, the latch bolt is attracted by the magnet and projected. That is, there has been proposed one in which the latch bolt does not protrude from the end face when the door is opened.

[0004]

By the way, in the above-mentioned conventional magnet latch lock in which the latch bolt is attracted by a magnet and protruded only when the door is completely closed, the latch is opened when the door is opened. It is safe because the bolt does not project to the door end face, but when the door is closed vigorously, the latch bolt protrudes due to centrifugal force,
There was a risk of damaging the door frame.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks. The latch bolt does not protrude from the door end surface when the door is opened, and the latch bolt protrudes by centrifugal force even when the door is closed vigorously. Another object of the present invention is to provide a flat latch lock that does not damage the door frame.

[0006]

SUMMARY OF THE INVENTION A flat latch lock according to the present invention comprises a latch bolt protruding from a lock box and arranged to be retractable, a spring member for urging the latch bolt in a retracting direction, and the latch. The lock box includes a cam member forcibly retracting the bolt, a pendulum member capable of restricting the protrusion of the latch bolt, and a rotating strike having a magnet disposed on a strike side for receiving the latch bolt. The pendulum member limits the protrusion of the latch bolt when a centrifugal force is applied.

The latch bolt is suctioned by a rotating strike located at an opposite position in a state where centrifugal force is not applied to the lock box, protrudes from the lock box, and is tightened empty. Further, the latch bolt maintains a protruding state by a lock member. Further, the pendulum member has a steady rest on one side.

As described above, according to the flat latch lock of the present invention, when the centrifugal force acts, the pendulum member limits the projection of the latch bolt, so that the door frame is not damaged even if the door is strongly closed.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view showing an internal mechanism of a lock body constituting the flat latch lock of the present invention, FIG. 2 is a front view of a lock body constituting the flat latch lock, and FIG.
FIG. 4 is a side view showing an internal mechanism of a strike unit constituting the flat latch lock, and FIG. 4 is a front view showing the strike unit. Here, the flat latch lock is composed of a lock body 10 and
And a strike unit 11.

The lock body 10 has a latch bolt 13 which protrudes from the lock box 12 and is arranged to be retractable. The latch bolt 13 has projections 14a and 14b on both sides, and horizontally protrudes and retreats as the projections 14a and 14b move in elongated holes 15a and 15b formed in the lock box 12. The latch bolt 13 is urged in a retreating direction by a coil spring 16 having one end fixed to the lock box 12.

At the upper end of the latch bolt 13, a pendulum member 1
7 is rotatably supported by a column 18. That is, the pendulum member 17 is attached to the small-diameter portion 18 a of the support 18 by the E-ring 19.
, So that it can swing only in the lateral direction (perpendicular to the direction in which the latch bolt 13 projects). The pendulum member 17 is substantially trapezoidal, and has a narrow operating projection 17a at the center. When the centrifugal force is not applied, as shown by a solid line in FIG.
8 and is loosely fitted in the central groove 20 of the latch bolt 13. This central groove 20 is formed at a fixed length at the upper end of the latch bolt 13.

The lock box 1 is provided on one side of the pendulum member 17.
2, the steady rest 21 is inserted and fixed. The insertion position of the steady rest 21 is determined depending on whether the door is opened rightward or leftward. The latch bolt 13 is provided with the central groove 2 at a position retracted into the lock box 12.
A horizontal groove 22 is formed in a direction perpendicular to 0, and as shown by an imaginary line in FIG. 5, when a centrifugal force is applied to the pendulum member 17, the operation projection 17a projects laterally from the horizontal groove 22,
The protrusion of the latch bolt 13 is limited.

In the lock box 12, a cam member 23 for forcibly retracting the latch bolt 13 is rotatably disposed. The cam member 23 has a star-shaped hole 24 into which a spindle such as a lever handle or a grip ball is inserted, and has an operating arm 23a that engages with the projection 14b of the latch bolt 13 and retracts. The cam member 23 is moved by the spring 25 from the state where the latch bolt 13 is retracted as shown in FIG.
Is returned to the state shown in FIG. Therefore, when the latch bolt 13 is moved backward by the lever handle or the like, the handle automatically returns to the original position.

A lock member 26 is rotatably supported by a shaft 27 in the lock box 12, and is provided with a latch 28 by a spring 28.
Are biased in a direction away from the rear end. The lock member 26 is engaged with the rear end of the latch bolt by the thumb turn cam 29 to maintain the latch bolt 13 in a protruding state. Further, the thumb-turn cam 29 is formed with a shaft hole 30 that engages with a thumb-turn shaft (not shown). A screw hole is formed in the shaft 27, and the cover 36 of the lock box can be screwed.

On the other hand, the strike hole 11 for receiving the latch bolt 13 has a receiving hole 31 into which the latch bolt 13 enters. A rotating strike 33 having a magnet 32 is provided in a recess communicating with the receiving hole 31. The rotation strike 33 is rotatably supported by a shaft 34 and is urged by a spring 35 in the direction of the latch bolt 13 that is opposed to the rotation strike 33. The rotating strike 33 is bent in a substantially rectangular shape in cross section, and the contact portion 33a with the latch bolt 13 has a certain angle α with the contact surface of the latch bolt 13 in the standby state shown in FIG. have. Further, at the time of the engagement shown in FIG. 7, the contact surface of the latch bolt 13 and the contact portion 33a of the rotating strike 33 are in a parallel state.

Next, the operation of the flat latch lock configured as described above will be described. First, the attachment direction of the steady rest 21 is selected depending on whether the door to which the flat latch lock is attached is opened rightward or leftward. If the door is suddenly closed and a strong centrifugal force is applied to the lock box 12, the pendulum member 17 swings and protrudes from the lateral groove 22 of the latch bolt 13 as shown by an imaginary line in FIG. 13 is prevented from protruding by centrifugal force. Therefore,
When the door is strongly closed as in the related art, there is no possibility that the latch bolt will protrude due to centrifugal force and damage the door frame.

When the influence of the centrifugal force disappears even if the door is strongly closed, the pendulum member 17 returns vertically by its own weight, and the latch bolt 13 can be projected. In this state, it is attracted by the magnet 32 of the strike part 11 arranged opposite. When the door comes into contact with the door frame and stops suddenly, the pendulum member 17 tries to swing in the opposite direction due to the inertial force, but is stopped at the center position by the steady rest 21 and the latch bolt 13 is stopped.
Protrudes. As shown in FIG. 3, the rotating strike 33 having the magnet 32 is initially shifted forward due to the urging force of the spring 35, and the contact surface with the latch bolt 13 is perpendicular to the vertical plane.
The angle.

When the leading end of the latch bolt 13 comes into contact with the rotating strike 33, the rotating strike 33 retreats against the weak urging force of the spring 34 as shown in FIG. Moves forward, and the tip of the latch bolt 13 and the contact surface of the rotating strike 33 are sucked in a parallel state.

When the latch bolt 13 projects into the strike portion 11, the empty tightening is completed. In this state, when the thumb turn cam 29 is turned from inside the room by operating the thumb turn cam 29 and the lock member 26 is rotated to restrict the latch bolt 13 from retreating, locking is performed.

Next, when the door is opened, the thumb member is operated to release the lock member 26 from the rear end of the latch bolt 13, and then the lever handle or the grip ball is operated to operate the cam member 2.
3 to force the latch bolt 13 to lock the lock box 12
Retreat inside. The door can be opened in this way.

Incidentally, the present invention is not limited to the above embodiments, and various design changes can be made based on the technical idea of the present invention.

[0022]

As described above in detail, according to the flat latch lock of the present invention, a latch bolt protruding from the lock box and arranged to be retractable, and biasing the latch bolt in the retreating direction. A rotating member having a spring member, a cam member for forcibly retracting the latch bolt, a pendulum member capable of restricting the protrusion of the latch bolt, and a magnet disposed on a strike side for receiving the latch bolt; When the centrifugal force is applied to the lock box, the pendulum member limits the protrusion of the latch bolt, so that even when the door is closed vigorously, the latch bolt protrudes from the end face of the door due to the centrifugal force. There is no risk of damaging the door frame.

The latch bolt is sucked by the rotating strike at the opposite position without centrifugal force applied to the lock box and protrudes from the lock box. Therefore, only when the door is completely closed, the latch bolt is released. Engagement with the strike completes the empty tightening. Further, since the latch bolt maintains the protruding state by the lock member, it can be locked using a thumb turn.

Since the pendulum member is provided with a steady rest on one side, when the door comes into contact with the door frame, the centrifugal force in the opposite direction from the direction in which the door was swung by the centrifugal force when closing the door is used. Return and stop at the center position. Therefore, even if the door is vigorously fitted into the door frame, the latch bolts protrude and the empty closing of the door is completed. Without the steady rest, the centrifugal force in the opposite direction when contacting the door frame causes the pendulum member to protrude to the opposite side, preventing the latch bolt from protruding, and the door to bounce off the door frame.

[Brief description of the drawings]

FIG. 1 is a side view showing an internal mechanism of a lock body constituting a flat latch lock of the present invention.

FIG. 2 is a front view of a lock body constituting the flat latch lock.

FIG. 3 is a side view showing an internal mechanism of a strike unit constituting the flat latch lock.

FIG. 4 is a front view showing the strike unit.

FIG. 5 is an enlarged longitudinal sectional view showing a relationship between a latch bolt and a pendulum member of the flat latch lock.

FIG. 6 is a side view showing a relationship between a latch bolt and a pendulum member of the flat latch lock.

FIG. 7 is a longitudinal sectional view showing an engagement state between a lock main body and a strike portion of the flat latch lock.

FIG. 8 is a side view showing a steady rest used for the flat latch lock.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lock main body 11 Strike part 12 Lock box 13 Latch bolt 14a, b Projection part 15a, b Elongated hole 16 Coil spring 17 Pendulum member 17a Operating projection 18 Support 18a Narrow diameter part 19 E ring 20 Central groove 21 Steady stop fitting 22 Side groove 23 Cam Member 23a Working arm 24 Star hole 25 Spring 26 Lock member 27 Shaft 28 Spring 29 Thumb turn cam 30 Shaft hole 31 Receiving hole 32 Magnet 33 Rotating strike 33a Contact portion 34 Shaft 35 Spring 36 Cover

Claims (4)

(57) [Claims] A latch member protruding from the lock box and capable of retreating, a spring member for urging the latch bolt in a retreating direction, a cam member forcibly retreating the latch bolt, and the latch A pendulum member capable of restricting the protrusion of the bolt, and a rotating strike having a magnet disposed on the strike side for receiving the latch bolt, wherein the pendulum member is latched when centrifugal force is applied to the lock box. A flat latch lock characterized by restricting bolt protrusion. 2. The latch bolt according to claim 1, wherein the latch bolt is sucked by a rotating strike located at an opposite position in a state where no centrifugal force is applied to the lock box, protrudes from the lock box, and is tightened empty. Flat latch lock. 3. The flat latch lock according to claim 1, wherein the latch bolt is kept in a protruding state by a lock member. 4. The flat latch lock according to claim 1, wherein the pendulum member has a steady rest on one side.