JP2599916Y2 - 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 in a latch lock, and more particularly to a latch lock capable of reducing the number of components and reducing the size of a lock case.

[0002]

2. Description of the Related Art A latch lock is disclosed in JP-B-59-30.
There is a technique described in Japanese Patent Application Publication No. 876-876. As shown in FIG. 4, the structure of this latch lock is such that a latch insertion hole 3 is opened in a front 2 which is a front wall of a box-shaped lock case 1 and a head of a latch bolt 4 is formed in the latch insertion hole 3. 5 is removably inserted.

The latch bolt 4 has a rear shaft 6 extending from the rear end surface of the head 5, and the rear shaft 6 is inserted through a ring 7 provided on the inner wall surface of the lock case 1. Is provided with an engagement projection 8. A spring 9 wound around the rear shaft 6 is elastically mounted between the rear end face of the head 5 and the ring 7, so that the latch bolt 4 is biased in a direction in which the head 5 projects from the front 2. You.

A distal end of a door handle 11 is fixed to a hub 10 rotatably fitted in a hole (not shown) penetrating the lock case 1, and a pushing projection 12 and an abutting portion are formed on the outer peripheral surface of the hub 10. 13, a passive part 14 is formed. One end of a pipe 16 is pivotally mounted on a shaft 15 erected on the inner wall surface of the lock case 1, and a washer 18 and a push plate 19 are fixed to the tip of a piston 17 inserted into the pipe 16.

A push plate 1 of a piston 17 is provided by a spring 20 elastically mounted between one end of a pipe 16 and a washer 18.
9 is pressed against the passive portion 14, the hub 10 is urged in the counterclockwise direction in FIG.
Is in contact with a rotation preventing shaft 21 provided on the inner wall surface of the.
Then, when the door is closed, the latch bolt 4 abutting on the door frame sinks into the surface of the front 2 against the spring 9, and when the door is fully closed, it projects again and engages with the door frame. Combine.

At this time, after the engaging projection 8 moves in the direction away from the pushing projection 12, it returns to the old position again, so that the hub 10 remains stopped without being affected by the latch bolt 4. . When the door handle 11 is turned, the hub 10 turns clockwise against the spring 20 and the pushing projection 12 pushes the engagement projection 8.
The latch bolt 4 is retracted, and the door can be opened. When the hand is released from the door handle 11, the hub 10 returns to the old position where it contacts the rotation preventing shaft 21.

[0007]

This latch lock has a structure in which a spring 9 for urging the latch bolt 4 is inserted between the head 5 and the ring 7, so that the hub 1 is moved from the front 2 to the hub 1.
The dimension d ₁ to the center of 0 becomes large. This spring 9
When provided between the rear wall 1a of the rear portion and the lock case 1 of the latch bolt 4 is, as shown in FIG. 5, the dimension d ₂ is increased from the center of the hub 10 to the rear wall 1a. In either case, the overall length d of the lock case 1 in the lateral direction increases.

In order to widely use a latch lock in various doors, it is necessary to reduce the size of the latch lock. In order to provide a durable latch lock at low cost, the internal structure must be simple. No. However, the above-described latch lock requires two springs 9 and 20 and has a disadvantage that the number of components is increased and the structure is complicated. An object of the present invention is to provide an inexpensive latch lock that can be reduced in size, has a small number of components, has a simple structure, and is durable.

[0009]

In order to achieve the above object, a latch lock according to the present invention is formed in a box shape and has a lock case having a latch insertion hole opened at the front, and a lock case which can be protruded and retracted from the latch insertion hole. A rear shaft extends from a rear end surface of the inserted head, and a latch bolt provided with a flange portion on the rear shaft is rotatably fitted to the lock case, and a door handle is fixed to the inner peripheral surface. A hub having a pushing projection provided on an outer peripheral surface thereof protruding between the head and the flange portion, one end pivotally attached to a support shaft provided on the lock case, and the other end being connected to the head. It protrudes between the flanges, and a spring locking portion is provided in the middle part.
A lever that will be substantially parallel to the serial reception, the hub
A spring that biases the hub in the direction in which the door handle is returned, one end of which is pressed against the spring engagement portion, and the lever that biases the rear end surface of the head. And was constituted by.

[0010]

In the latch lock constructed as described above, one end of the spring urges the hub in the return direction of the door handle, and the pushing projection of the hub stops at a position where the flange of the latch bolt is not pushed. I have. Also, the other end of the spring is pressed against the spring engaging portion, and the lever pressed by the spring engaging portion presses the rear end face of the head of the latch bolt with the support shaft as a fulcrum. Therefore, the head of the latch bolt projects from the front.

When the door is tightened, the head of the latch bolt comes into contact with the door frame side and sinks into the front surface. The lever pushed on the rear surface of the head of the retreating latch bolt tilts in the retreating direction of the latch bolt about the support shaft. At this time, the hub is stopped at the return position without being affected by the retraction of the latch bolt or the tilting of the lever. When the door is fully closed, the head of the latch bolt projects from the front and engages with the door frame.

When the door handle is turned, the hub turns, and the pushing projection pushes the flange of the latch bolt.
The head of the latch bolt sinks into the front surface, and the door can be opened. When the door handle is released, the hub returns to the old position, and the head of the latch bolt projects again from the front surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. FIG. 1 is a front view of a latch lock with a case cover removed. The lock case 25 of the latch lock is formed in a box shape by a case body 26 having a front opening in FIG. 1 and a case cover 27 covering the opening, and is embedded in the end face of the door D.

A latch insertion hole 30 is formed in a front 28 and a second front 29 constituting the front side wall of the case body 26, and a head 32 of a latch bolt 31 is inserted into the latch insertion hole 30 so as to be able to protrude and retract. The latch bolt 31
A rear shaft 33 extends from the rear end surface of the head 32,
Is provided with a flange portion 34 at the end of.

Both ends of the hub 35 are rotatably fitted in hub holes (not shown) penetrating the case body 26 and the case cover 27. The hub 35 is bent at right angles from both ends of the connecting portion 35a, respectively, and opposed side walls 35b,
A tubular handle (not shown) having both ends fixed to the side wall 35b is formed. A square handle insertion hole 36 is formed in the inner surface of the tubular portion. Is fitted.

On both side walls 35b of the hub 35, pushing projections 37 projecting between the head portion 32 and the flange portion 34 are provided, and a contact surface 38 is formed near the connecting portion 35a. 2). Fixed shafts 39 and 40 are erected on the bottom wall of the case main body 26 (see FIG. 2), and screw holes 39 a and 40 a threaded on the upper surfaces of the fixed shafts 39 and 40 have holes provided in the case cover 27. The head screw 41 is screwed into the case cover 27 (see FIG. 1), and the case cover 27 is fastened to the case body 26. The fixed shaft 40 is a stopper against which the contact surface 38 of the hub 35 contacts when the hub 35 rotates counterclockwise, and when the hub 35 rotates clockwise, the pushing projection 37 Is also a stopper that abuts.

One end of a lever 43 is pivotally attached to a support shaft 42 penetrating the case body 26 and the case cover 27, and a pin-shaped spring engaging portion 44 is attached to an intermediate portion of the lever 42. The spring 4 wound around the cylindrical portion of the hub 35
5, one end 45a is pressed against the spring locking portion 44, and the spring 45
Is pressed against the inner wall surface of the connecting portion 35a of the hub 35.

Accordingly, the lever 43 is biased counterclockwise about the support shaft 42, the free end of the lever 42 presses the rear surface of the head 32, and the head 32 projects from the surface of the front 28 ( (See FIG. 1). On the other hand, the hub 35 is urged counterclockwise, and is stopped at the return position where the contact surface 38 contacts the fixed shaft 40 (see FIG. 1).

At this time, the flange 34 of the latch bolt 31 urged in the direction protruding from the front 28 is connected to the hub 35.
Abuts on the pushing projection 37, so that the amount of projection of the latch bolt 31 is restricted.

The operation of the latch lock constructed as described above will be described with reference to FIGS. In a normal state in which the door opening / closing operation is not performed and the door handle is not operated, as shown in FIG. 1, the lever 43 in which the spring locking portion 44 is pressed by the one end 45 a of the spring 45 rotates counterclockwise, Since the rear end face of the head 32 is pushed, the head 32 protrudes from the surface of the front 28.

A connecting portion 35a is connected to the other end 45b of the spring 45.
Is pressed in the counterclockwise direction, and the contact surface 3 is pressed.
8 is in the standby position where it hits the fixed shaft 40,
Regulates the amount of protrusion of the latch bolt 31. Therefore, the latch bolt 31 and the hub 3 are formed by one spring 45.
5 are energized at the same time. Also, since the lever 43 is substantially parallel to the second front 29 and has a small amount of tilt, it can be provided in a narrow space between the second front 29 and the hub 35, and the lateral length of the latch lock can be reduced. It can be smaller than the conventional one.

When the door D is closed, the tip of the head 32 comes into contact with the door frame side (not shown) and sinks into the surface of the front 28. The lever 43 pushed on the rear surface of the head 32 that retreats in the immersion direction uses the support shaft 42 as a fulcrum,
Tilt clockwise (see FIG. 2). At this time, the hub 35
Is stopped at the return position without being affected by the retreat of the latch bolt 31 or the tilting of the lever 43. When the door D is fully closed, the head 32 of the latch bolt 31
8 and engages with an engaging hole (not shown) on the door frame side.

When the door handle is rotated to open the door D, the hub 35 is rotated clockwise as shown in FIG. 3 and the pushing projection 37 is moved to the flange 34 of the rear shaft 33 of the latch bolt 31. , The head 32 of the latch bolt 31
Is immersed in the surface of the front 28, and the door can be opened. When the head 32 retracts in the immersion direction, the lever 43 tilts clockwise. When the door handle is released, the hub 35 rotates to the return position, the head 32 projects again from the surface of the front 28, the lever 43 rotates counterclockwise to return, and returns to the state of FIG.

[0024]

[Effects of the Invention] The present invention is configured as described above, and has the following effects. (1) According to the present invention, two springs required for the conventional latch lock can be reduced to one spring, so that the number of springs is reduced and the structure of the latch lock is simplified. become. Therefore, there are advantages that the latch lock is inexpensive and advantages such as increased durability. (2) In the present invention, there is no spring for increasing the lateral dimension of the lock case, the lever is provided substantially parallel to the second front, and the amount of tilt can be small, so that the lock case can be downsized. There are advantages such as easy attachment to the door.

[Brief description of the drawings]

FIG. 1 is a front view of a latch lock with a case cover removed in a normal state where a door opening / closing operation and a door handle turning operation are not performed.

FIG. 2 is a front view of the latch lock with a case cover removed in a state where a latch bolt is retracted by an opening and closing operation of a door.

FIG. 3 is a front view of the latch lock with a case cover removed when a handle is operated.

FIG. 4 is a front view of a conventional latch lock with a case cover removed.

FIG. 5 is a front view of another conventional latch lock with a case cover removed.

[Description of Signs] D Door 25 Lock Case 26 Case Body 28 Front 30 Latch Insertion Hole 31 Latch Bolt 32 Head 34 Flange 35 Hub 36 Handle Insertion Hole 37 Pushing Projection 38 Contact Surface 42 Support Shaft 43 Lever 45 Spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A lock case formed in a box shape and having a latch insertion hole opened at the front, and a rear shaft extending from a rear end surface of a head inserted into and out of the latch insertion hole. A latch bolt provided with a flange portion, a door handle is fixed to the inner peripheral surface so as to be rotatable with the lock case, and a pushing projection provided on the outer peripheral surface is provided with the head and the flange portion. One end is pivotally attached to a hub provided between the hub and the lock case, and the other end projects between the head and the flange, and a spring locking portion is provided at an intermediate portion , Above front
A lever that will be disposed substantially parallel to, wound on the hub
A spring that biases the hub in the direction in which the door handle returns, the other end presses against the spring engaging portion, and the lever biases the rear end face of the head in a direction to press the rear end face. Latch locks.