JPH09291733A - Latch lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latch lock which easily automatically unlocks by retreat of a latch when the latch lock is set in a lock state by maloperation so as to close a door. SOLUTION: This latch lock forms a locking or unlocking state by advancing or retreating a latch 10 against a front 4 by rotationally moving a hub 20, and in addition to this, by engaging or disengaging the lock projection 32 of a lock cam 30 rotatably provided in the vicinity of the hub 20 with the hub 20. In this case, this is constituted so that it is provided with an unlock cam 35 interlocking with retreating motion of the latch 10 and an unlock plate 40 engaged with the unlock cam 35 so as to slide, and the lock cam 30 on the lock position is rotationally moved to the unlock position by the unlock plate 40 sliding following to the reteating motion of the latch 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch lock mounted on an edge portion of a door and locking and unlocking the latch by retracting the latch from the front, and more specifically, it provides a latch with a final tightening function and prevents erroneous operation. The present invention relates to a latch lock equipped with an automatic unlocking mechanism for preventing the main tightening due to locking.

[0002]

2. Description of the Related Art Bathroom doors and toilet doors are often equipped with latch locks that can be locked by simply opening and closing the doors and equipped with inner locks that can be locked and unlocked only from inside.

In recent years, with the increase in the quality of indoor doors used in bathrooms and toilets, a dead bolt other than a latch is not provided, but a lock mechanism that is operated by a thumb turn provided inside the latch lock is provided in the latch lock, and the thumb turn is provided. Just by rotating, locks the knobs and lever handles for opening and closing indoors and outdoors to prevent rotation,
There is a smart and easy-to-handle latch lock that locks the latch by the knob or lever handle and locks the latch to the final tightening.

Such a latch lock having a full-tightening function on the latch is unlocked from the outside when the door is closed as a set in a locked state due to an erroneous operation when the user goes out of the room. It is equipped with an automatic unlocking mechanism to prevent the main tightening due to the locking of the wrong operation so that it will not be disabled.

FIG. 4 shows an example of a conventional latch lock having a main tightening mechanism by the above-mentioned latch and an automatic unlocking mechanism. The hub 50 is rotated by operating a knob (not shown). The cam 51 for the knob is attached to the front side of the knob cam 51.
However, a hooking protrusion 54 is provided upright on the rear end edge. And, the frogs 53 are protruded from the front 52 and spring 5
The base end portion 56 of the latch 55 biased toward the front 52 by 7 is engaged, and the latch 55 is activated when the hub 50 is rotated leftward or rightward. This latch lock uses a knob and constitutes a well-known idle lock mechanism.

This latch lock is provided with a lock mechanism having an automatic unlocking mechanism that locks the hub 50 to prevent the hub 50 from rotating. This lock mechanism is provided with a lock hub 58 having a rectangular peripheral surface which is sandwiched by U-shaped springs 60 and is elastically stopped in a predetermined direction. The lock hub 58 is provided on the indoor side. It is designed to rotate by operating a thumb turn (not shown).

When the lock hub 58 is rotated, the lock lever 61 having the lock groove 62 is interlocked with the lock cam 59 fixed to the lock hub 58 to lock and unlock. That is, in FIG. 4, a thumb turn (not shown) is actuated to move the lock lever 61 in the unlocked state against the biasing force of the U-shaped spring 60 to the locked position indicated by an imaginary line, and the lock groove 62 is engaged with the hooking protrusion 54 of the knob cam 51 to lock, and unlocked by the reverse operation of the thumb turn.

When an outdoor person closes the door in a locked state as a set by an erroneous operation, the latch head 63 collides with a receiving plate (not shown) attached to the pillar and latches 55.
Is retracted, and the base end portion 56 of the latch 55 is locked by the lock lever 61.
The vicinity of the rotation base shaft 64 is pressed. With this pressing force, the lock lever 61 is forcibly moved from the locked position to the unlocked position to automatically unlock.

[0009]

SUMMARY OF THE INVENTION By the way, a latch lock provided with the above-mentioned conventional latch is provided with a main tightening function and an automatic unlocking mechanism for preventing a main tightening due to a malfunction.
The lock lever 61 is locked in a biased state by the U-shaped spring 60, and the base end portion 56 of the latch 55 directly presses the vicinity of the rotation base shaft 64 of the lock lever 61 to automatically unlock. Therefore, a strong impact force on the latch head 63 is required for the automatic unlocking by the movement of the latch 55.

Therefore, the momentum of closing the door is weak and the latch head 6
When the impact on 3 is weak, the latch 55 does not move backward due to the resistance of the lock lever 61, the door remains open without closing the door, and the latch head 63 collides with the receiving plate. Latch 55 and its interlocking links were susceptible to damage due to stress. Further, when the door is closed with a strong force, the door is securely unlocked, but the door closing noise is large, and the base end portion 56 of the latch 55, the connecting portion and the abutting portion of each part constituting the lock mechanism are worn. And fatigue progresses, the load on the entire latch lock by the automatic unlocking is large, and the rattling is accelerated.

The present invention has been made in view of the above problems, and when the door is closed as a set in a locked state due to an erroneous operation when the user goes out of the room, the latch can be easily retracted and the latch can be easily retracted. The challenge is to make it a latch lock that can be unlocked automatically.

[0012]

SUMMARY OF THE INVENTION In a latch lock of the present invention, the latch is protruded and retracted from the front by rotating the hub, and the locking projection of a lock cam rotatably provided near the hub is engaged with the hub. In a latch lock that forms a locked / unlocked state by disengaging, an unlocking cam that interlocks with the retracting operation of the latch and an unlocking plate that slides by engaging with the unlocking cam are provided, and according to the retracting operation of the latch, The sliding unlocking plate is automatically unlocked automatically by rotating the lock cam at the locking position to the unlocking position.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 to 3 show one of the preferred embodiments of the latch lock of the present invention, in which reference numeral 1 forms the outer shell of the latch lock to be dug and attached to the edge of the door 2. The front body 4 is formed by covering the face plate 4a integrally formed with the side plate 3 with the armor plate 4b at the front, and the front wall 4 is intermittently provided upright on the peripheral edge of the side plate 3. At the same time, a lid (not shown) is screwed to the plurality of case columns 6 erected on the side plate 3 to form a box.

In the figure, reference numeral 10 is a latch shaft 11.
Is a latch provided with a latch head 12 having an inclined surface at its tip, and a flange 13 is provided at the base end of the latch shaft 11, and a latch spring 14 is provided between the rear surface of the flange 13 and the rear wall 5a. The latch 10 is urged in the front four directions. A latch guide 21 of a rotating plate 23 that is fixed to the hub 20 and rotates together with the hub 20 is in contact with the front surface of the collar 13 to prevent the latch 10 from coming out of the case 1 and to prevent the hub 20 from moving out. The latch 10 is pulled into the case 1 by rotating.

Therefore, the latch head 12 expands and contracts the latch spring 14 every time the hub 20 is rotated, and the latch head 12 extends and retracts from the front 4. At the same time, the latch spring freely expands and contracts by the pressure directly applied to the latch head 12. , The latch head 12 is freely retracted from the front 4 and the slot 1 of the pillar 15
6 is inserted into and removed from the plate 6 through the receiving plate 17, and can be freely tightened.

In particular, in this embodiment, the hub 2 is pulled by pulling down a lever handle (not shown) in a fixed position.
It is a lever handle type latch lock that rotates 0 to one side to actuate the latch 10. A square hole 22 into which a square shaft of the lever handle is inserted is formed at the center of the hub 20.

A lever spring 24 for returning the pulled down lever handle to the original position is provided on the lower surface of the rotating plate 23 of the hub 20, and an inclined surface 25 is provided behind the rotating plate 23. A fin-shaped lever cam 27 formed on the subsequent vertical surface 26 is formed. The lever handle allows the hub 20 to rotate in the latch pull-in direction, and the hub 20 is biased by the lever spring 24. The vertical surface 25 of the rotating plate 23 and the rear wall 5a are brought into contact with each other to regulate the elastic force of the lever handle and the latch 10 in a fixed position, and the latch 10 as a whole constitutes an empty tightening mechanism. There is.

Further, reference numeral 30 is a lock cam having a locking projection 32 for preventing the rotation of the hub 20 to bring the hub 20 into a fully tightened locked state, and a thumb turn (not shown) via a square hole 31 located at the center. It is provided below the hub 20 so as to be rotated by. 1 shows that the lock cam 30 is in the unlocked position, and FIG. 2 shows that the lock cam 30 is rotated so that the tip end surface of the locking projection 32 comes into contact with the lower end surface 28 of the lever cam 27. Prevent rotation of the hub 20,
It shows that the main tightening is in the locked state. A person inside the room can lock and unlock by turning the thumb turn, but cannot unlock from outside.

The part described below is the automatic unlocking mechanism of this embodiment. In the drawing, reference numeral 35 is a plate-like unlocking cam bent in a boomerang shape, which is rotatably attached to the cam column 36 at its bent portion and is biased upward by the cam column spring 37. There is. The upper tip of the unlocking cam 35 is formed with a cam surface 38 for rotating the unlocking cam 35 downward in response to the retracting movement of the retracting latch head 12, and the lower tip 39 is a case. It is fitted into the engagement hole 41 of the unlocking plate 40 that slides along the lower wall 5b forming the main body 1.

The unlocking plate 40 is provided so as to be slidable in the front-rear direction in response to the movement of the latch head 12 and the movement of the unlocking cam 35 operated by the cam column spring 37.
As shown in FIG. 3, when the lock cam 30 is in the locking position, the abutting portion 42 bent upward of the rear end of the unlocking plate 40 is set to have a size that abuts on the receiving surface 33 of the lock cam 30. Further, in the unlocked state shown in FIG. 1, the unlocking plate 40 makes an idle motion in the front-rear direction via the unlocking cam 35 in conjunction with the idle tightening movement of the latch 10.

In the present embodiment configured as described above, for example, when the door opened by a person who goes out of the room is accidentally closed by setting the lock cam 30 to the locked state shown in FIG. As shown in FIG. 6, the unlocking cam 35 is activated by the latch head 12 hitting the receiving plate 17 of the pillar 15 and retracting from the front 4, and the unlocking plate 40 slides to lock the lock cam 30 at the abutting portion 42. Poke the receiving surface 33 of. Therefore, the lock cam 30 is released in the unlocking direction to rotate,
The latch 10 shown in FIG. 1 is automatically unlocked and the door is closed when the latch 10 shown in FIG.

In the present embodiment, the unlock cam 35 is used.
Is only urged by the weak force of the cam column spring 37 that pulls the unlocking plate 40 back toward the front 4, so that it easily operates when hitting the latch head 12 that is retracted from the front 4, Slide 40. Therefore, even when the door in the unlocked state is opened and closed, the latch 10 is repeatedly tightened without feeling the resistance of the unlocking cam 35.

Further, the main tightening and unlocking is performed by rotating only the lock cam 30 from the indoor side through the thumb turn, so that the main tightening and unlocking is simple and reliable.

When the door is closed in a locked state by an erroneous operation, the lock cam 30 merely serves as a stopper of the hub 20 and is rotatably stopped in the locked position, so that the unlocking plate 40 is pushed. Rotate easily and gently with a pad to unlock. Therefore, even if the momentum of closing the door is weak and the impact on the latch head 12 is not so strong, the automatic unlocking device operates, the latch head 12 is closed tightly and the door is closed, so that the latch head 12 is fixed to the receiving plate 17. The latch 10 and its interlocking link are not damaged by the stress caused by the collision, and the load on the entire latch lock by the automatic unlocking is small.

[0026]

As described above, the present invention is provided with the unlocking cam that interlocks with the retracting operation of the latch and the unlocking plate that slides by engaging with the unlocking cam, and slides according to the retracting operation of the latch. Since the unlocking plate is configured to rotate the lock cam in the locked position to the unlocked position, for example, even if a person outside the room puts the opened door in the locked state and accidentally closes the door, it will be automatically unlocked instantly. Then, the door is closed in an empty state.

Further, since the automatic unlocking can be performed by a very small pressing force of the latch, the latch does not hit the receiving plate and the door is not opened, so that the door can be closed quietly and surely and the latch can be closed. The latch and its interlocking link are not damaged by the stress caused by the collision of the head with the receiving plate, and the burden on the entire latch lock by the automatic unlocking is small.

Further, since the parts constituting the automatic unlocking mechanism are not so complicated and do not receive a large impact, it is not necessary to form them by using a material having particularly high strength, and the durability is also excellent, which is economical. Is also very advantageous.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a different state in the embodiment shown in FIG.

FIG. 3 is a vertical cross-sectional view showing a further different state in the embodiment shown in FIG.

FIG. 4 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 4 Front 10 Latch 20 Hub 30 Lock Cam 32 Locking Protrusion 35 Unlocking Cam 40 Unlocking Plate

Claims (1)

[Claims] 1. A latch for forming an locked / unlocked state by rotating the hub so that the latch is retracted from the front and the locking projection of a lock cam rotatably provided near the hub is engaged with and disengaged from the hub. The lock includes an unlocking cam that interlocks with the immersing operation of the latch, and an unlocking plate that slides in engagement with the unlocking cam, and the unlocking plate that slides in accordance with the immersing operation of the latch is in a locking position. A latch lock characterized by rotating a lock cam to an unlocked position.