JP2001012116A - Muffled latch lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muffled latch lock having the strength durable for a long service and large in muffling effect. SOLUTION: A latch bolt 5 slidably stored in a latch case 1 is urged by a spring 8 so that a head part 7 is projected. In a synthetic resin latch bush 11, a cylindrical part 11a is fitted to a latch insertion hole 3a in a fitting flange 3, a latch insertion hole 12a in an armor plate 12 in front thereof, and an inner circumference of a forward part of the latch case 1 to guide the head part 7, a groove 11b in the axial direction is engaged with a projection 7f in the radial direction at the rear end of the head part to regulate the projection of the head part, and a flange part 11c is held between the fitting flange 3 and the armor plate 12. In a synthetic resin muffled pat 10, an arc-life part 10c is fitted in a center groove 7c of the head part 7 over the whole length of a columnar side surface and a tip part of a flat side surface, and a penetration part 10d extending from the arc-like part 10c and having an engagement claw 10a for coming off prevention on a tip is fitted to a through hole 7d in the axial direction of the head part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinged door which is attached to the tip of a hinged door and slidably housed in a latch case. The present invention relates to a silence type latch lock which engages with a latch receiving member provided on a frame.

[0002]

2. Description of the Related Art Conventionally, for example, the one shown in FIG.
No. 4397). This latch lock is a latch case 31
Shaft 32a of latch bolt 32 housed slidably inside
Of the latch bolt head 32 with a contracted spring (not shown).
b forwardly so that b protrudes, and the head 32b
The head 32b is entirely covered with a synthetic resin cap 34 having engagement grooves 34a, 34b that engage with engagement portions 33a, 33b protruding from both sides of the rear end. . The head 32b protruding at the door closing position shown in FIG.
And the door 34 is closed, and the cap 34 that covers the head 32b reduces sliding noise and collision noise during engagement.

[0003]

However, in the conventional latch lock described above, the head 32b of the latch bolt to which a large load is applied when the door is closed and in the closed state is completely covered with a synthetic resin cap 34 to mute the noise. Due to the cover, the cap 34 is deformed or damaged due to long-term use due to lack of durability due to insufficient strength, and the gap between the latch receiving bracket 37, the armor plate, and the latch insertion hole at the front of the latch case becomes large. However, there is a problem that the door rattles and the cap 34 needs to be replaced. Further, the above-mentioned conventional latch lock includes a latch bolt 32 and a latch case 31.
Because both the sliding contact portion and the protrusion regulating groove portion are made of metal,
There is a problem that the sliding sound and the collision sound generated by the contact between the metals cannot be reduced in this portion.

Accordingly, an object of the present invention is to partially cover the head of the latch bolt with a synthetic resin devised in a shape that is difficult to peel off, and to devise a structure to avoid metal contact between the latch bolt and the case. Another object of the present invention is to provide a muffling latch lock having strength enough to withstand long-term use and having a large muffling effect.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a shaft portion of a latch bolt is slidably housed in a latch case, and the latch bolt is connected to a front end of the latch case. In a silence type latch lock in which the latch bolt is biased by a spring so that a head protrudes, a latch insertion hole of a mounting flange at a front end of the latch case and a latch insertion of an armor plate attached to a front surface of the mounting flange. A cylindrical part that fits into the hole and the inner periphery of the front part of the latch case and guides the latch bolt, and engages with a radial projection at the rear end of the head of the latch bolt to restrict the protrusion of the head A latch bush made of synthetic resin having an axial groove formed on the outer periphery of the cylindrical portion, and a flange portion provided between the mounting flange and the armature plate. An arc portion that fits into the central groove of the head over the entire length of the cylindrical side surface and the front end portion of the flat side surface, extends from this arc portion, fits into the axial through hole of the head, and comes off at the front end. And a sound deadening pad made of a synthetic resin having a penetrating portion having an engaging claw for stopping.

According to the first aspect of the present invention, a circular arc portion is inserted into the central groove extending over the entire length of the cylindrical side surface of the latch bolt head and the tip of the planar side surface, and into the axial through hole of the latch bolt head. The sound absorbing pads made of synthetic resin are mounted by fitting the respective parts, and the engaging claws at the tips of the penetrating parts prevent the sound absorbing pads from coming off from the latch bolt heads. In other words, the latch bolt head has only a central groove that is a part, and the cylindrical side surface that comes into contact with the latch receiving bracket when the door is closed has a flat side surface over the entire length in which a large force is applied in the opening direction when the door is closed. The muffler pad is mounted only at the tip of the door in a state where it is difficult for the engagement claw to peel off, so the collision sound when closing the door can be reduced and the metal contact surface in the closed state increases and the strength improves. , Even if it is used for a long time,
The silencing pad does not break or fall off. Also,
The latch bush made of synthetic resin, whose flange is sandwiched between the mounting flange at the front end of the latch case and the armor plate attached to the front surface, has the latch insertion hole of the mounting flange, the latch insertion hole of the armor plate, and the front of the latch case. The cylindrical part fitted to the inner periphery of the part guides the sliding latch bolt, and the axial groove of this cylindrical part engages with the radial projection at the rear end of the latch bolt head to prevent the head from projecting. regulate. In other words, the latch bolt slides and moves on the synthetic resin latch bush as the door is opened and closed, and the projecting operation is restricted by hitting the latch bush, so that the reciprocating sliding noise and the collision noise at the projecting end are reduced. Can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIGS. 1 (A) and 1 (B) are a plan sectional view and a half sectional side view as viewed from a door opening direction, respectively, showing an example of the muffled latch lock according to the first aspect. This latch lock has a half cylindrical case 2 having a mounting flange 3 at the front end.
The shaft portion 6 of the latch bolt 5 is slidably housed in the latch case 1 composed of the case lid 4 fixed to the case 2 by two connecting rods 2a and 2b projecting from the inner surface of the case in the diameter direction. The latch bolt 5 is urged by a spring 8 compressed so that its head 7 protrudes from the front end of the latch case 1, and a hub 9 diametrically supported by a rear portion inside the latch case 1. The step cam 9a is engaged with the two-step cam groove 6e on both sides of the rear end of the latch bolt 5, and the cam-cam groove is engaged with the rotation of a door knob shaft (not shown) inserted through the square hole 9b of the hub 9. Accordingly, the latch bolt 5 is immersed in the latch case 1 against the spring 8. As shown in FIG. 1A, the latch case 1 is attached to the tip of the hinged door 35, and the head of the latch bolt 5 protruding at the door closing position where the hinged door 35 contacts the door stop 36a of the mounting frame 36. The part 7 is engaged with the latch receiving member 37 having the strike plate 37a of the mounting frame.

As shown in FIGS. 2A and 2B, the latch bolt 5 has a connecting rod 2a ( (See FIG. 1 (A).) Has a rectangular through-hole 6a through which the spring 8 is compressed between the projection 6b at the front end of the through-hole 6a and the connecting rod 2a. While forming a connecting portion 6c protruding toward the portion 7, the rear portion of the shaft portion 6 has a U-shaped indented portion 6d in which a hub 9 (see FIG. 1) is fitted. The two-step cam groove 6e protruding toward the rear end is formed. The head 7 of the latch bolt 5 has a cylindrical side surface 7.
b, a central groove 7c extending over the central full length of the central side surface 7a, a through hole 7d branching axially from a door opening side of the central groove 7c, and branching axially from a door closing side of the central groove 7c. A pair of radial projections 7f, 7f are formed at the rear end of the head 7 as left and right diametric stoppers.

FIGS. 3A and 3B show a silencing pad 10 made of synthetic resin so as to fit into the central groove 7c, through hole 7d, and engaging hole 7e of the latch bolt head 7. FIG. It is the top view and the side view seen from the door opening direction, respectively. This silencing pad 10 has an arc portion 10c fitted into the central groove 7c,
An engaging portion 10e that branches off from the arcuate portion 10c and fits into the engaging hole 7e; a penetrating portion 10d that branches off from the arcuate portion 10c and fits into the through hole 7c; An engaging claw 10 which projects into a wedge shape and engages with the back wall 7g of the head 7 to prevent the sound deadening pad 10 from falling off.
a.

FIGS. 4A and 4B are a front view and an axial sectional view, respectively, of a latch bush 11 made of a synthetic resin for guiding the sliding latch bolt 5 and restricting its forward projection. ing. This latch bush 11
The outer periphery of the front end fits into the oval-shaped latch insertion hole 12a of the armor plate 12 (see FIG. 5), and the outer periphery other than the front end fits with the mounting flange 3 and the front of the latch case 1 (see FIG. 1). A cylindrical portion 11a having a circular shape for fitting, and an oval shape over the entire length for fitting the inner periphery to the latch bolt head 7.
An annular flange portion 11c provided at the boundary between the oval and circular outer periphery of the cylindrical portion 11a; and a left and right side of the cylindrical portion 11a which are notched in a rectangular shape in the axial direction from a rear end. Radial projections 7f, 7f at the rear end of 7 (see FIGS. 1A and 2A)
Are engaged with the axial groove 11b. As shown in FIGS. 1A and 1B, the latch bush 11 includes an annular groove 3b provided on a peripheral edge of a latch insertion hole 3a of a mounting flange 3 protruding vertically at a front end of the case 2; Mounting flange 3
The flange 11c is clamped between the latch insertion hole 12a of the armature plate 12 attached to the front surface of the armature plate 12 and is fitted into the latch case 1, and slides on and guides the head 7 of the latch bolt that appears and disappears. At the same time, the projection of the head 7 due to the bias of the spring 8 is restricted by the radial projection 7f as a stopper abutting on the tip of the axial groove 11b of the cylindrical portion 11a.

The armature plate 12 is shown in FIG.
As shown in the front view and the vertical cross-sectional view of (B), a latch insertion hole 12a into which the oval front end of the latch bush 11 is fitted in the center of a rectangular plate made of stainless steel. It has a dish-shaped mounting hole 12b which is fixed to the mounting hole 3c (see FIG. 1B) of the flange 3 by caulking. In this silencing latch lock, the knob return spring for returning the door knob, whose center shaft is inserted through the hub 9 in FIG. 1, to the illustrated restoring position where the latch bolt 5 projects, is not provided inside the latch case 1 but on the door 35 side. Is provided as a coil spring acting in the torsion direction in a knob receiving seat (not shown).

The silence type latch lock having the above configuration operates as follows. When the hinged door 35 is pivoted from the direction of arrow A in FIG. 1A toward the door stop 36 a of the mounting frame 36, the head 7 of the latch bolt 5 strikes the strike plate 37.
a, while pressing and retracting the spring 8, the latch case 1
When the door 35 is brought into contact with the door stop 36a, the head 7 comes to a position where it fits into the latch receiving fitting 37, so that the head 7 projects from the latch case 1 by the force of the spring 8 which extends, and the latch receiving fitting 37 And the door is locked. Here, the head 7 of the latch bolt 5
The silencing pad 10 made of synthetic resin fits the arc portion 10c with a limited width in the central groove 7c over the entire length of the cylindrical side surface 7b and the tip of the planar side surface, and engages the engaging portion 10e with the engaging hole 7.
e, the penetrating portions 10d are fitted into the through holes 7d, respectively.
The engaging claw 10a at the tip of d is attached to the rear wall 7g so as to be hardly peeled off. Therefore, unlike the conventional example described with reference to FIG. 6, a metal contact surface is formed on the cylindrical side surface 7b of the head abutting on the strike plate 37a, and the collision noise is reduced while ensuring the strength to withstand a collision when the door is closed. Then, the metal contact surface is greatly increased on the flat side surface 7a which abuts on the inner wall of the latch receiving member 37, and the strength to withstand a large force that can be applied in the opening direction in the door-tight state is secured. It can be used for a long period of time without generating backlash in the state and breakage and detachment of the head 7.

The latch bolt 5 is slidably supported by the latch case 1, the mounting flange 3 and the armature plate 12 only through a synthetic resin latch bush 11 which is fitted onto the head 7 having an oval cross section. Since the radial projection 7f at the rear end of the head as a stopper for restricting the projection is engaged with the axial groove 11b of the latch bush 11, the latch bolt 5 slides only on the latch bush 11 made of synthetic resin. The latch bush 11
As a result, the sliding noise of the latch lock and the collision noise at the protruding end can be greatly reduced. Furthermore, in the above-mentioned muffled latch lock, since the knob return spring for returning the door knob to the restoration position is not provided in the latch case 1, the latch case 1 can be downsized. It is possible to avoid troubles such as damage caused by use.

[0014]

As is apparent from the above description, claim 1
The silencing type latch lock of the present invention fits into the latch insertion hole of the mounting flange at the front end of the latch case, the latch insertion hole of the armor plate attached to the front of this mounting flange, and the inner periphery of the front part of the latch case. A cylindrical portion for guiding a bolt, an axial groove for engaging a radial projection at a rear end of the head of the latch bolt to restrict the protrusion of the head, and the mounting flange provided on an outer periphery of the cylindrical portion; And a latch bush made of synthetic resin having a flange portion sandwiched between the armature plate and a circular arc fitted into the central groove of the head of the latch bolt over the entire length of the cylindrical side surface and the tip of the planar side surface. And a sound deadening pad made of a synthetic resin having a penetrating portion that extends from the circular arc portion, fits into the axial through hole of the head, and has a locking claw at the tip end. , Latch bolt The synthetic resin silencing pad, which is partially attached to the head in a state where it does not easily come off, increases the metal contact surface and secures strength while reducing the collision noise when the door is closed. It can be used for a long time without breakage of the part, and the synthetic resin latch bush that guides the slide of the latch bolt and regulates the protrusion can reduce the reciprocating sliding noise and the collision sound at the protruding end. .

[Brief description of the drawings]

FIG. 1 is a plan sectional view and a half sectional side view seen from a door opening direction showing an embodiment of a sound deadening type latch lock of the present invention.

FIG. 2 is a plan sectional view of the latch bolt of FIG. 1 and a side view seen from a door opening direction.

3A and 3B are a plan view and a side view of a sound deadening pad mounted on a head of the latch bolt of FIG. 2 as viewed from a door opening direction.

FIG. 4 is a front view and an axial cross-sectional view of a latch bush that supports the latch bolt of FIG. 2;

5A and 5B are a front view and a longitudinal sectional view of an armor plate attached to a front surface of the attachment flange of FIG.

FIG. 6 is a partially cutaway plan view of a conventional silence type latch lock.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Latch case 2 Case 3 Mounting flange 3a Latch insertion hole 4 Case lid 5 Latch bolt 6 Shaft 7 Head 7a Flat side surface 7b Cylindrical side surface 7c Central groove 7d Through hole 8 Spring 9 Hub 10 Silence pad 10a Engagement claw 10c Arc part 10d Penetration part 11 Latch bush 11a Cylindrical part 11b Axial groove 11c Flange part 12 Armor plate 12a Latch insertion hole 35 Opening door 36 Mounting frame 37 Latch receiving bracket 37a Strike plate

Claims (1)

[Claims] The latch bolt is slidably housed in a latch case, and the latch bolt is biased by a spring so that a head of the latch bolt projects from a front end of the latch case. In the muffler type latch lock, the latch engages with the latch insertion hole of the mounting flange at the front end of the latch case, the latch insertion hole of the armor plate attached to the front of the mounting flange, and the inner periphery of the front of the latch case. A cylindrical portion for guiding a bolt, an axial groove for engaging a radial projection at a rear end of the head of the latch bolt to restrict the protrusion of the head, and the mounting flange provided on an outer periphery of the cylindrical portion; A latch bush made of a synthetic resin having a flange portion sandwiched between the armature plate and the armature plate; An arc portion that fits over the fitted axially through holes of the head extends from the circular arc portion,
A silencing pad made of a synthetic resin having a penetrating portion having an engaging claw for retaining at a tip thereof.