Latch lock

Abstract

To provide a latch lock comprising a sound deadening mechanism capable of securely reducing impact noise generated when a latch bolt of the latch lock enters a projection state.SOLUTION: A latch lock comprises: an interlocking member 4 which moves together with a latch bolt 3; a cushioning spring 5 which is arranged between a lock case 1 and the interlocking member 4, and compressed when the latch bolt 3 moves in a projecting direction; and an elastic member 6 on which an abutting part 41 of the interlocking member 4 abuts when the latch bolt 3 moves in the projecting direction, and which is arranged in the lock case 1 to be balanced in the compressed state, and also made of foam rubber.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a latch lock, and more particularly to a latch lock equipped with a sound-deadening mechanism that reduces the impact noise generated when a latch bolt of the latch lock is in a protruding state. [Background technology]

[0002] A latch lock is designed to close a door by fitting a latch bolt, which is freely movable in and out of the door edge, into a square hole in a receiving seat attached to the door stop. However, this type of latch lock in particular has the problem that a high-pitched impact noise like a "click" is generated when the latch bolt enters the square hole, i.e., when the latch bolt of the latch lock protrudes.

[0003] This impact sound resonates with the latch lock and the door, amplifying it, causing the problem that the sound can disturb a sound sleep, particularly at night when everyone is quiet.

[0004] To address this problem, it has been proposed and put into practical use in conventional latch locks to provide an elastic member as a sound-absorbing mechanism to reduce the impact noise generated when the latch bolt is extended (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-18666 [Patent Document 2] JP 2022-144017 A Summary of the Invention [Problem to be solved by the invention]

[0006] Thus, in conventional latch locks, an elastic member is provided as a sound-deadening mechanism to reduce the impact sound generated when the latch bolt is in the protruding state, but this elastic member is made of a relatively hard rubber material in consideration of mounting properties, etc. Therefore, although it is possible to reduce the high-pitched impact sound "click," it is not possible to completely prevent the generation of the low-pitched impact sound "bang."

[0007] In view of the problems associated with conventional latch locks, the present invention aims to provide a latch lock equipped with a sound-absorbing mechanism that can reliably reduce the impact noise generated when the latch bolt of the latch lock is in a protruding state. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the latch lock of the present invention is a latch lock in which a latch bolt, which is subjected to a spring force in the direction of protruding from the lock case, is operated to extend and retract using a handle, and is characterized in that it is equipped with an interlocking member that moves together with the latch bolt, and an elastic member made of foamed rubber arranged in the lock case against which the interlocking member abuts and which is balanced in a compressed state when the latch bolt moves in the protruding direction.

[0009] In this case, the size of the contact surface of the elastic member with which the interlocking member comes into contact can be made larger than the contact surface of the interlocking member.

[0010] The elastic member may be made of closed-cell foamed rubber made of ethylene propylene rubber.

[0011] Also, a buffer member may be interposed between the rear end face of the latch bolt and the interlocking member. Effect of the Invention

[0012] According to the latch lock of the present invention, when the latch bolt moves in the protruding direction, the interlocking member that moves together with the latch bolt abuts against an elastic member made of foamed rubber arranged in the lock case and balances in a compressed state, thereby reliably reducing the impact noise generated when the latch bolt of the latch lock protrudes. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an explanatory diagram showing one embodiment of the latch lock of the present invention, in which (a1) is a front view when the latch bolt has moved in the retracting direction, (b1) is a right side view of the same, (a2) is a front view when the latch bolt has moved in the protruding direction, and (b2) is a right side view of the same. [Diagram 2] FIG. 13 is an explanatory diagram of the latch lock, and is a perspective view showing when the latch bolt has moved in the protruding direction. [Diagram 3] FIG. 2 is an explanatory diagram of the latch lock, and is a cross-sectional view of the latch bolt when it moves in the protruding direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the latch lock of the present invention will be described with reference to the drawings.

[0015] 1 to 3 show an embodiment of a latch lock of the present invention. Like conventional latch locks, this latch lock has a latch bolt 3 that receives a biasing force from a spring 2 in a direction that causes it to protrude from a lock case 1 and that can be operated to extend or retract using a handle (not shown). This latch lock is equipped, as a sound-absorbing mechanism, with an interlocking member 4 that moves together with the latch bolt 3, a buffer spring 5 that is disposed between the lock case 1 and the interlocking member 4 and is compressed when the latch bolt 3 moves in the protruding direction, and an elastic member 6 made of foamed rubber that is disposed in the lock case 1 and against which the abutment portion 41 of the interlocking member 4 abuts when the latch bolt 3 moves in the protruding direction, so as to be balanced in a compressed state.

[0016] The buffer spring 5 uses a spring with a smaller spring constant than the spring 2 that urges the latch bolt 3 in the direction of protruding from the lock case 1, and when the latch bolt 3 receives the urging force of the spring 2 and moves in the protruding direction, it is compressed, slowing down the moving speed of the latch bolt 3 and thereby reducing the impact noise that is generated.

[0017] The elastic member 6 can suitably be made of closed-cell foamed rubber made of ethylene propylene rubber (in this embodiment, closed-cell foamed rubber with an expansion ratio of 5 to 20 times, preferably 10 to 15 times, and more preferably about 12 to 13 times) having a rectangular shape (width 14 mm x height 8 mm x thickness 5 mm).

[0018] The size of the contact surface of the elastic member 6 (in this embodiment, a rectangular shape (width 14 mm x height 8 mm)) is larger than the size of the contact surface of the contact portion 41 of the interlocking member 4 (in this embodiment, a rectangular shape (width 8 mm x height 3.5 mm)), specifically, it is preferable to use an elastic member 6 having a size that is three or more times (in this embodiment, four times) the size of the contact surface of the contact portion 41 of the interlocking member 4.

[0019] A buffer member 7 is interposed between the rear end face of the latch bolt 3 and the interlocking member 4. The cushioning member 7 can be preferably an elastic member made of rubber or soft synthetic resin. This makes it possible to reliably reduce the impact noise generated between the latch bolt 3 and the interlocking member 4.

[0020] In this latch lock, when the latch bolt 3, which is subjected to the biasing force of the spring 2, moves in the protruding direction, the buffer spring 5 is compressed, slowing down the moving speed of the latch bolt 3 and thereby reducing the impact noise generated. In addition, the abutment portion 41 of the interlocking member 4 which moves together with the latch bolt 3 abuts against the elastic member 6 made of foamed rubber arranged in the lock case 1, and the elastic member 6 gradually becomes equilibrium in a compressed state (specifically, the elastic member 6 becomes equilibrium in a compressed state of 5 to 30%, preferably 10 to 20% (12% in this embodiment) in the thickness direction). This reliably reduces the impact noise generated when the latch bolt of the latch lock protrudes (a high-pitched impact sound like a "click" or a low-pitched impact sound like a "bang").

[0021] In particular, by setting the size of the abutment surface of the elastic member 6 against which the interlocking member 4 abuts larger than the abutment surface of the abutment portion 41 of the interlocking member 4, the abutment portion 41 of the interlocking member 4 enters the elastic member 6, causing the movement speed of the latch bolt 3 to decrease and stop, thereby almost completely preventing the generation of impact noise.

[0022] In addition, by interposing a buffer member 7 between the rear end face of the latch bolt 3 and the interlocking member 4, the impact noise generated between the latch bolt 3 and the interlocking member 4 can be reliably reduced.

[0023] The above describes the latch lock of the present invention based on its embodiment, but the present invention is not limited to the configuration described in the above embodiment, and the configuration can be changed as appropriate within the scope of the spirit of the present invention. [Industrial Applicability]

[0024] Since the latch lock of the present invention is equipped with a sound-absorbing mechanism that can reliably reduce the impact noise generated when the latch bolt of the latch lock is extended, it can be suitably used in latch lock applications in which the latch bolt, which is biased by a spring in the direction of protruding from the lock case, is operated to extend and retract using a handle. [Explanation of symbols]

[0025] 1 tablet case 2 Spring 3 Latch bolt 4 Interlocking parts 41 Contact part 5. Buffer spring 6 Elastic member 7. Cushioning materials

Claims

1. This latch lock has a latch bolt that is biased by a spring in the direction of protruding from the lock case and can be extended and retracted by a handle, and is characterized in that it comprises an interlocking member that moves together with the latch bolt, and an elastic member made of foam rubber arranged in the lock case against which the interlocking member abuts and is balanced in a compressed state when the latch bolt moves in the protruding direction.

2. 2. The latch lock according to claim 1, wherein the size of the contact surface of the elastic member with which the interlocking member comes into contact is larger than the contact surface of the interlocking member.

3. 3. The latch lock according to claim 1, wherein the elastic member is made of closed-cell foam rubber made of ethylene propylene rubber.

4. 3. The latch lock according to claim 1, further comprising a buffer member interposed between the rear end surface of the latch bolt and the interlocking member.

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