JPH057386Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a silencing device for a latch in a lock.

[Conventional technology]

When the latch, which is biased in the protruding direction by a spring, returns to its protruding position, a clicking sound is generated.
In hospitals, libraries, etc., this latch sound is sometimes extremely disliked, and conventionally, rubber-like elastic bodies have been exclusively used as a means for muffling the sound. That is, a means has been adopted in which a rubber-like elastic body is applied to either the latch plate supporting the latch or the latch rod and its contact portion (stopper portion).

[Problem that the invention attempts to solve]

According to the conventional means as described above, since a rubber plate or a rubber block is fixed to a latch support member such as a latch plate or a contact portion, a design change is required so that the stroke of the latch support member is not restricted. However, there may be design restrictions when combining a lock mechanism with a latch mechanism, and since the sliding speed of the latch and support member upon return due to the spring does not change, there is a limit to the silencing effect. It was hot.

This invention was proposed to solve these problems.

[Means to solve the problem]

The sound damping device for the latch in the lock of this invention is provided with an action piece on the support member of the latch which is biased in the projecting direction by a spring, and an adhesive material that engages with the action piece in the vicinity of the support member in the lock case. It is characterized by the provision of an enclosed rotary damper.

This invention will be explained below based on embodiments shown in the drawings.

Each member of this invention, except for the stopper 12 and the adhesive material 15c, which will be described later, is usually made of a metal material such as iron or a hard synthetic resin material.

In Fig. 1, 1 is a lock case, 1a is a front plate forming part of the lock case 1, 1b is a case cover plate, 1c is a protrusion hole for a latch 2 (described later), and 2 is always biased in the protrusion direction by a spring 3. 4 is a latch plate and other latch support members that connect and support the latch 2; 5 is a guide member for the latch 2 that is solidly attached to the lock case body 1 and the case cover plate 1b; 6 is a knob or other handle (not shown); ) into which the shaft 7 of the latch support member 4 is fitted, 8 is a swinging connection piece that connects the hub 6 and the rear piece 4a of the latch support member 4, 9 is a pivot of the swinging connection piece 8, 10 11 is a return spring after the handle is operated; 11 is one stopper of the swing connecting piece 8 when the latch support member 4 is displaced rearward to the position shown by the chain line; and 12 is fixed to the rear side of the guide member 5. The other stopper is made of rubber-like elastic material. The actuation mechanism for such latches is well known in the art.

In this invention, as shown in FIGS. 1 and 2, a separate or integrated working piece 13 is fixedly provided at a suitable position on the above-mentioned support member 4. The actuating piece 13, which is made separately, is fixed to the latch support member 4 using any fixing means 14 such as a stud or screw. and,
Near the support member 4 in the lock case 1,
A rotary damper 15 containing an adhesive substance is provided to movably engage the action piece 13. Numerals 16 and 16 are screws that fix the entire rotary damper 15 to the case 1.

A second example of the rotary damper 15 described above.
To explain in detail with the drawings, 15a is a hollow cylindrical fixed base, and the hollow part of the base 15a is sealed with a lid plate 15b. A grease-like adhesive substance 15c and a circular rotary plate 15d are sealed in the hollow portion of the base body 15a. A connecting shaft 15e, one end of which is fixed to the center of the rotating plate 15d, connects to the lid plate 15.
b is rotatably passed through it, and a planar U-shaped engagement piece 15f is fixed to the other end. This engagement piece 15f is movably engaged with the above-mentioned action piece 13 with its U-shaped portion. Therefore, in this rotary damper 15, when the latch support member 4 returns from the position indicated by the chain line, the rotary plate 15d, which rotates via the action piece 13, the engagement piece 15f, and the shaft 15e, absorbs the frictional force of the adhesive substance 15c. The supporting member 4 is provided with a braking action, thereby imparting a damping action to the support member 4.

What is important here is that the action piece 13 on the latch support member 4 and the engagement piece 15f of the rotary damper 15
This positional relationship allows the operating piece 13 to selectively engage with the engaging piece 15f. That is, the action piece 13 and the engagement piece 15f are engaged only in the latter half of the return stroke when the latch 2 and the latch support member 4 return to the protruding direction, and are in a disengaged state at the initial stage. Yes. This configuration is adopted in order to avoid interfering with the original closing action of the latch 2.

In addition, in the present invention, the rotary damper 15
The structure and shape of the actuating member 13 and the engaging member 15f can be arbitrarily designed as long as they are of the adhesive substance-enclosed type.

[Effect]

In the above configuration, the handle shaft 7
When the latch support member 4 is rotated clockwise in FIG. 1 against the return spring 10, the pivoting connecting piece 8, which rotates together, retracts the latch support member 4 against the spring 3 to the position shown in chain lines. The latch 2 will now be retracted into the case 1. At this point, when you release the handle,
The swinging connecting piece 8 returns to the old position in advance by the return spring 10, and the latch 2 and the latch support member 4
tries to return to the protruding side with a slight delay due to the restoring force of the spring 3, but at this time, the braking action of the rotary damper 15 slows down the return speed and returns to the original position, so the latch sound is almost eliminated. It turns out.

When closing the door without rotating the handle, the latch 2 is automatically retracted against the spring 3 at the door frame portion, and then reaches the latch insertion hole and protrudes again. Similarly, the latch sound is sufficiently muted.

[Effect of idea]

According to the latch silencer of this invention described above, the rotary damper 15 filled with an adhesive substance is manufactured to be relatively small in size, and the latch 2 is sufficiently pressed against the supporting member 4 when the latch 2 returns to the protruding state. Since it provides a braking action, it can be incorporated into existing locks without any special design changes, and there is no problem when combining lock mechanisms. When the support member 4 returns to its original position, the speed is sufficiently reduced near the end, resulting in an extremely excellent sound deadening effect.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of this invention, and FIG. 2 is an enlarged partial vertical sectional view taken along the line of FIG. 1. 1...Lock case, 2...Latch, 3...Spring,
4... Latch support member, 13... Action piece, 15...
...Rotary damper.

Claims (1)

[Scope of utility model registration request] An operating piece 13 is provided on the support member 4 of the latch 2 which is biased in the protruding direction by a spring 3, and a rotary member filled with an adhesive substance is provided near the support member 4 in the lock case 1 and engages with the operating piece 13. A silencing device for a latch in a lock, characterized in that a damper 15 is provided.