JPH0816423B2 - Door latch device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door latch device.

[0002]

2. Description of the Related Art A conventional door latch device urges a latch provided in a door so as to be able to protrude and retract from the door by a spring in an outward direction.
When the door is closed, the latch hits the pillar and is recessed, and in the fully closed position, the latch faces the receiving hole formed in the pillar, and the latch is fitted into the hole by the bias of the spring.

[0003]

When the door closer is attached to the door, if the closing force of the door closer is strong, the metal noise generated when the latch collides with the pillar is disliked. To close the door quietly, the closing force of the door closer must be reduced.

However, if the closing force of the door closer is weakened, when the latch hits the post, the latch does not dent, and the latch is hooked on the post and does not fully close. It was difficult to adjust the closing force of the door closer so as to close the door quietly without preventing the door from being completely closed.

The present invention clarifies a latch device which can solve the above-mentioned problem by causing a latch provided on a pillar to be retracted and retracted into and from a receiving hole of the door by attraction and repulsion by magnetic force at a fully closed position of the door. To do.

[0006]

The latch device of the present invention comprises a pillar (2).
A latch (3) is provided so that it can appear in and out of the door, a latch receiving hole (40) is provided in the door (1), and the latch is provided in the back of the receiving hole (40).
A support shaft (5) is rotatably provided as an extension of (3), and a plurality of magnets (31) (3) are respectively provided on the support shaft (5) and the latch (3).
2), (51) and (52) are arranged facing each other, and the facing magnets are the support shaft (5)
The orientation of the poles is determined so that it can be switched between adsorption and repulsion by the rotation of the support shaft (5) and the rotation of the handle (7) on the support shaft (5) via the bevel gears (53) (62). The rotation mechanism (60) that converts into rotation is linked.

[0007]

[Operation and effect] The latch (3) is sunk in the pillar and stands by.

When the door (1) is closed, the support shaft on the door (1) side is
The different poles of the magnets (51) and (52) on (5) and the magnets (31) and (32) of the latch (3) on the pillar (2) side face each other, and the latch (3) is attracted. It emerges from the accommodation hole (21) and enters the receiving hole (40) to automatically lock the door.

When the handle (7) is rotated, the support shaft (5) linked to the handle through the rotation mechanism (60) rotates, and the magnets (51) (52) on the shaft also rotate together with the shaft. The outer magnetic poles of the magnets (51) and (52) and the outer magnetic poles of the magnets (31) and (32) on the column (2) side match, and the magnets (31) (51), (32) and (52) ) Latch by repulsion
(3) goes into the accommodation hole (21) and the lock is released.

As described above, when the door (1) is closed, the latch (3) is submerged in the accommodation hole (21) of the pillar (2), and the door (1) is closed.
Will not collide with. When the door (1) is closed, the magnet (31) (3
2) Latch (3) is attracted to the receiving hole (40) of the door (1) by the suction force of (51) and (52) and automatically locked.

The conventional collision noise caused by the spring-biased latch in the popping-out direction is eliminated, and there is no object that would be a resistance to closing the door (1), and the closing force of the door closer is reduced. Can be closed quietly.

[0012]

EXAMPLE A latch receiving hole (21) is horizontally opened in a pillar (2) facing a closed position of a door (1), and a latch (3) is provided in the hole so as to be retractable.

The latch (3) is a non-magnetic shaft body (30) made of synthetic resin.
A pair of permanent magnets (31) and (32) are provided on both side surfaces of the tip of the magnet at the same distance from the axis, and one magnet (31) has an S pole on the outside and an N pole on the inside, and the other magnet ( In 32), the N pole is fixed to the outside and the S pole is directed to the inside.

A groove (33) is formed in the axial direction on the base end side of the shaft body (30), and a ridge (22) slidably fitted in the groove is provided in the accommodation hole (21). The body is prevented from rotating and is slidably fitted into the accommodation hole (21), and the shaft body (30) is in a standby state where it reaches the inside of the hole, and its tip is slightly recessed from the opening surface of the hole.

A hollow lock case (4) is embedded in the side end surface of the door (1) on the pillar side, and the front plate (41) of the case is flush with the side end surface of the door (1).

A receiving hole (40) is formed in the front plate (41) facing the latch (3) substantially at the center thereof so as to penetrate the plate and the receiving hole (40).
The support shaft (5) is rotatably fitted to the guide cylinder (44) behind and disposed.

A pair of permanent magnets (51) and (52) are provided at the tip of the support shaft (5) on the side of the receiving hole (40) equidistant from the axis, and one magnet (51) has an S pole outside. The magnet (52) is arranged with the N pole on the inside and the other magnet (52) with the N pole on the outside and the S pole on the inside.

The distance between the centers of the magnets (51) and (52) is equal to that of the latch.
It is approximately equal to the distance between the centers of the magnets (31) and (32) of (3).
A rotation mechanism (60) is connected to the support shaft (5), and the rotation mechanism (6)
0) has a rotary shaft (6) arranged orthogonally to the support shaft (5), and forms a large bevel gear (62) of approximately 1/2 arc on a disc (61) projecting from the shaft, It meshes with a small bevel gear (53) protruding from the base end of the support shaft (5).

The circular plate 61 of the rotary shaft 6 and the plates 42, 43 on both sides of the lock case 4 have circular arc-shaped through-holes whose radial center is the axial center of the rotary shaft 6. 63) (45) is established.

A driving piece (72) having an arcuate cross section is arranged so as to penetrate through the arc hole (45) of the lock case (4), the arc hole (63) on the rotary shaft (6) and the plate surface of the door (1). Then, both ends of the drive piece (72) are connected to the rotating shaft (71) of the door handle (7).

The circular arc hole (45) of the lock case (4) is provided with the rotary shaft (6).
It is opened longer than the upper arc hole (63) in the arc direction, and when the handle (7) is turned, the drive piece (72) turns the arc hole (4) of the lock case (4).
The rotation shaft (6) rotates following the drive piece (72) by rotating by the margin of 5). By rotating the rotating shaft (6), the bevel gear is attached to the shaft.
The support shaft (5) connected via (53) and (62) also rotates.

The handle (7) can be rotated 90 ° from the sideways position to the downward position, and when the handle (7) is rotated 90 °, the support shaft (5) rotates 180 °.

The handle (7) is always urged sideways by a spring (not shown) built in the handle mounting member (73), and when the handle (7) is in the sideways state, the handle (7) is placed on the support shaft (5).
One magnet (51) (52) and two magnets (31) (3) on the latch (3)
2) are directly facing each other, and the magnets (31) (5
The magnetic poles of 1), (32) and (52) are set to be different from each other.

When the door (1) is closed, the magnets (51) (52) on the support shaft (5) on the door (1) side and the latches on the pillar (2) side are closed.
The magnets (31) and (32) in (3) face each other directly in front, and the opposite poles face each other.

The latch (3) is adsorbed and emerges from the accommodation hole (21), enters the receiving hole (40) and locks the door (1).

When the handle (7) is rotated, the support shaft (5) rotates 180 °, the magnets (51) (52) on the shaft also rotate integrally with the shaft, and the outside of the magnets (51) (52) The magnetic poles of the magnets match the magnetic poles on the outside of the magnets (31) (32) on the side of the pillar (2), and the latches (3) are retracted by the repulsion of the magnets (31) (52), (32) (51). ) And the lock is released.

As described above, when the door (1) is closed, the latch (3) does not collide with the door (1) by immersing it in the accommodation hole (21) of the pillar (2). ) Closes the magnet (31) (32) (51)
Due to the suction force of (52), the latch (3) causes the receiving hole (4
0) and automatically locked.

Conventional spring-biased latch in spring direction
The collision noise due to (3) is eliminated, there is no resistance to closing the door (1), and the closing force of the door closer can be reduced to quietly close the door (1).

The number of magnets on the latch (3) side and the support shaft (5) side is not limited to two at a time, and any number of magnets can be used as long as the attraction and repulsion are switched by the rotation of the handle. .

In the practice of the present invention, the handle (7) can be of course of a knob type and is not limited to the above-mentioned embodiment, but can be variously modified within the scope of the claims. Can be modified.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a latch device.

FIG. 2 is a sectional view of a latch device.

FIG. 3 is a perspective view of a support shaft and a latch.

[Explanation of symbols]

 (1) Door (2) Pillar (3) Latch (31) Magnet (32) Magnet (5) Support shaft (51) Magnet (52) Magnet (6) Rotation shaft (60) Rotation mechanism

Claims (1)

[Claims] 1. A pillar (2) is provided with a latch (3) capable of retracting, and a latch receiving hole (40) is provided in the door (1).
A support shaft (5) is provided in the back of the (0) so as to be rotatable at the door closed position coaxially with the axis of the latch (3).
(5) and the latch (3) have a plurality of magnets (31), (32), (5) respectively.
1) The (52) is arranged oppositely, and the facing magnets are oriented so that the poles are switched between attraction and repulsion by the rotation of the support shaft (5), and the support shaft (5) has a handle (7) of the handle (7). Supports rotation (5)
The rotation mechanism (60) for converting into rotation is linked, and the handle (7) is biased by the spring to magnets (51) and (52) of the support shaft (5) and the magnet (31) of the latch (3). A door latch device that is held so that the (32) are in a position where they are attracted to each other.