JPH0540202Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a retraction operation force switching device (hereinafter simply referred to as a switching device) for a latch bolt of a door lock or an interior lock, and in particular, the external operating member of the latch bolt is connected to a knob. The present invention relates to a switching device that can switch the strength of a latch bolt retraction operation force with a simple operation depending on whether it is a latch bolt or a handle.

[Conventional technology and problems]

The latch bolt is biased in the direction of protruding from the free edge of the door, and when the door is opened, the latch bolt resists the biasing force through external operating members such as knobs and handles and the latch bolt operating mechanism inside the lock box. , move it back into the lock box, and pull the tip of the latch bolt out of the strike hole.

Therefore, if the external operating member is a knob, the reaction force exerted on the outside by the latch bolt operating mechanism (hereinafter referred to as the latch bolt retracting operating force) must be reduced, and if the external operating member is a handle, it must be increased. . If the retraction force of the latch bolt is reversed to the above, in the case of a knob, you will have to turn the knob with an unnecessarily large force, making it less convenient to use, and in the case of a handle, on the contrary, it will not feel responsive. In some cases, the latch bolt will naturally retract due to the rotational moment caused by gravity in the handle.

Conventionally, in order to change the retracting force of a latch bolt, for example, during assembly in a factory, the spring that generates the retracting force is changed depending on the external operating member, or the spring that generates the retracting force is not changed and a single spring is used. In addition to pre-installing the spring into the lock box, a mechanism was attached to the spring to adjust the initial deflection of the spring from the outside, allowing the retracting force to be varied at the construction site.

However, among the above-mentioned latch bolt retraction force switching methods, the former method is difficult to handle on-site, and the latter method requires, for example, turning the plug many times, which is not only cumbersome to operate, but also Since the initial deflection of the spring is increased and the latch bolt is operated, the spring is further deflected, so there is a concern that the spring may become sagging.

[Purpose of invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a switching device that can switch the retraction force of a latch bolt with a simple operation at a construction site, and does not have to worry about spring fatigue.

[Means to resolve the problem]

In order to achieve the above object, the present invention includes a drive cam that is supported in a lock box so as to be rotatable around a rotation axis perpendicular to a side plate parallel to the door surface, and a front plate of the drive cam that is a slider that is guided so as to be movable in the front-rear direction perpendicular to the cam, engages with the drive cam and the latch bolt operating member, and is biased forward in the direction in which the latch bolt projects; A guide rod extending in the front-rear direction and having a front end surface exposed to the outer surface of the front plate is provided in the lock box so as to be rotatable around its axis and to fix the rotational angle position, and , the rotation around the axis of the guide rod is restricted, and the engaging body protruding in a direction perpendicular to the axis of the guide rod is movably guided in the length direction of the guide rod and biased forward, while the slider is , forming an engaging portion that can engage only with the engaging body at one selected angular position, and forming an engaging portion on the outer surface of the front plate depending on whether the external operating member connected to the drive cam is a handle or a knob. It is characterized in that the engaging body is engaged with and disengaged from the engaging portion of the slider by rotating the guide rod from the side.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 indicates a lockbox for an indoor lock, for example, and this lockbox 1 is housed in a lockbox cavity (not shown) dug into the free edge of the door, and is screwed into the lockbox. It is fixed at

A drive cam 2 is rotatably supported within the lock box 1. Drive cam 2 in the illustrated embodiment
A pair of drive arms 2a, 2a (Fig. 1) are integrally formed on the outer surface of a cylinder having a shaft hole with a substantially rectangular cross section, and protrude symmetrically with respect to a plane passing through the rotation axis. As shown in the figure, the lock box 1 is supported between a pair of side plates of the lock box 1 at a relative position such that the rotation axis is perpendicular to the side plates of the lock box 1 that are parallel to the door surface.

Further, within the lock box 1, a slider 3 is supported and guided so as to be movable in the front-back direction perpendicular to the front plate 4 (left-right direction in FIGS. 1 and 2). As shown in FIGS. 3 and 4, the slider 3 in the illustrated embodiment is a plate-like body having a bent portion having a U-shaped cross section at its front end (left end) and rear end, respectively. As shown in FIG. 3, a rectangular hole 3b and a vertically elongated connecting hole 3c in FIG. 3 are opened at approximately the center of the main body portion 3a along the front-rear direction. In addition, at the front end of the slider 3,
Leaving a pair of engaging parts 3d, 3d perpendicular to the main body part 3a, a first notch 3e whose horizontal projection in FIG. A second notch 3g having a horizontal U-shape in horizontal projection in FIG. 3 is formed, leaving the plate 3f.

On the other hand, as shown in FIG. 1 and FIG.
A retractor 5 is provided. This retractor 5 is a frame body in which a pair of actuating arms 5a, 5a of the same shape are integrally connected by a connecting piece 5b while maintaining a mutually parallel relational position, and as shown in FIG. The lower end near 5b is rotatably supported. As a result, the actuating arms 5a, 5a can swing in a plane parallel to the side plates of the lockbox 1.

As shown in FIG. 2, the pair of operating arms 5a, 5a overlap the slider 3 with the main body 3a sandwiched between them. Further, as shown in FIGS. 1 and 2, the actuating arms 5a, 5a
A connecting pin 6 which is crimped so as to connect substantially central portions of the connecting holes 3 of the slider 3
c (Fig. 3). Furthermore, as shown in FIG. 1, the retractor 5 is biased counterclockwise in FIG. 1 by the elasticity of a retractor spring 7, which is a torsion coil spring wound around the rotating shaft, for example.

With the above configuration, the slider 3 and the retractor 5
are integrally connected to each other via the connecting pin 6, so that when the slider 3 moves in the front-back direction, the retractor 5 swings in conjunction with the slider 3. Furthermore, the slider 3 is biased forward by the elasticity of the retractor spring 7, that is, in the direction from inside the lock box 1 toward the front plate 4.

Incidentally, the slider 3 is guided as described below, for example.

That is, as shown in FIGS. 1 and 2,
A spring receiving plate 8, which will be described later, is installed vertically between the side plates of the lock box 1. It is inserted so that it can be connected. On the other hand, the drive cam 2 is inserted into the U-shaped second notch 3g (FIG. 3) of the slider 3 so as to be able to come into sliding contact with the opening edge thereof. Therefore, the slider 3 is connected to, for example, the spring receiving plate 8, the drive cam 2, or the guide block 9 made of synthetic resin (see FIGS. 1 and 2).
It is guided so as to be movable in the front and back direction by the retractor spring 7, and is urged forward by the elasticity of the retractor spring 7, as described above. In a normal state where no external force is applied to the slider 3, as shown in FIG. The drive arms 2a and 2a of the drive cam are locked via the first and second drive pieces 11 and 12, respectively. Further, as shown in FIGS. 1 and 2, the actuating arms 5a, 5a of the retractor 5 are connected to a buffer block 13 made of rubber, for example, which is integrally connected to the rear side of the spring receiving plate 8.
This is held in such a way that it comes into elastic contact with.

On the other hand, a latch bolt 14 is located near the slider 3.
is guided so as to be movable in the front-rear direction, that is, parallel to the slider 3. The latch bolt 14 itself is well known, so to briefly explain, the latch bolt 14 has a latch shaft 15 and a latch head 16 with an inclined surface attached to the front end of the latch shaft 15. a latch guide 17 (FIG. 1) having a movably fitted guide hole;
and a rectangular latch bolt hole 18 which opens in the front plate 4 and slidably fits into the latch head 16.
(See FIG. 5) and is provided so as to be movable in the front and back direction parallel to the slider 3.

As shown in FIG. 1, a latch spring 19 as a compression coil spring is wound around the latch shaft 15 between the latch head 16 and the latch guide 17, and the elasticity of the latch spring 19 causes the latch bolt 14 to Although it is biased forward, in the normal state, the step formed at the rear end of the latch shaft 15 is engaged with the latch guide 17, so that the latch bolt 14 maintains the protruding position shown in the first figure. Further, the operating arm 5 of the retractor
The tip of a is in contact with a collar 15a formed at the rear end of the latch bolt 14 on the rear surface side of the latch guide 17, or is close to it with a very small distance.

On the other hand, as shown in FIGS. 1 and 2, a guide rod 21 is arranged so as to overlap the front half of the slider 3.

The guide rod 21 in the illustrated embodiment is the first
As shown in FIGS. 2 and 6, the main body rod 22 is a non-circular rod extending in the front-rear direction and having a rectangular cross section, for example, and the front end of the main body rod 22 is fitted on the rear side. It has a guide bush 23 which is a cylindrical body with a non-circular hole recessed therein and a rectangular block with a slot integrally protruding from the front surface. Then, the guide rod 21 is constructed by fitting the front end of the main body rod 22 into the non-circular hole of the guide bush 23 and integrally connecting both with a pin.

This guide rod 21 is connected to a circular hole (not shown) opened in the lock box front plate 1a that overlaps the front plate 4 or the guide block 9 (FIG. 1) by inserting the cylindrical portion of the guide bush 23 into the back of the main body rod 22. The circular cross-section portions integrally formed at the ends are rotatably fitted into the circular holes of the spring receiving plate 8, respectively.
In order to fix the rotational angle position of the guide rod 21, as shown in FIG. .

In order to prevent the guide rod 21 from slipping out of the lock box, a retaining ring 25 is provided on the circular cross section of the main rod 22 on the rear side of the spring receiving plate 8, as shown in FIGS. 1 and 2. It is fitted.

An engaging body 26 is supported and guided in the non-circular cross section of the main body rod 22 as described below. That is, the engaging body 2 in the illustrated embodiment
6, as shown in FIGS. 1, 2, and 6, is an elongated plate-like body whose both ends are bent toward the rear and whose central edge is extended in an arc shape for reinforcement; A square hole is opened in the center thereof and is slidably fitted into the main body rod 22. This engaging body 26 is
It is supported by the main body rod 22 by fitting the square hole into it, and is movable in the length direction of the main body 22, but rotation around the axis of the main body rod 22 is restricted.

Further, a lever spring 27 as a compression coil spring is elastically mounted between the engaging body 26 and the spring receiving plate 8, and the elasticity of the lever spring 27 causes the engaging body 26 to move in the same direction as the slider 3, that is, Forced forward.

[Effect]

An indoor lock equipped with a switching device according to an embodiment of the present invention configured as described above has the drive cam 2
An operating shaft (not shown) having a rectangular cross section is inserted into the shaft hole of the door, and a knob or handle is attached to the end of the operating shaft that protrudes into the door and outward.

When attaching the handle, as shown in FIGS. 1, 2, and 6a, the guide rod 2 is inserted so that the engaging body 26 extends in the length direction of the front plate 4.
Determine the rotation angle position of 1.

Then, the engaging body 26 engages the engaging bodies 3d, 3d (FIGS. 3 and 4) at the front end of the slider 3.
It engages with the slider 3 in such a way that it straddles it from the rear side.

In this state, when the handle is rotated clockwise or counterclockwise, the drive cam 2
Either one of the pair of drive arms 2a, 2a pushes the first drive piece 11 or the second drive piece 12 backward. Then, the slider 3 moves rearward, so the actuating arm 5a of the retractor, which is connected to the slider 3 via the connecting pin 6, rotates clockwise in FIG. 1 against the elasticity of the retractor spring 7. Its tip pushes the latch bolt 14 rearward and retracts it into the lock box 1.

At the same time, since the engaging body 26 is engaged with the slider 3, the slider 3 moves rearward while also deflecting the lever spring 27.

That is, in this case, the reaction force transmitted from the handle to the hand, that is, the apparent retraction force of the latch bolt, is a large force that is the sum of the elasticity of the retractor spring 7 and the elasticity of the lever spring 27, in other words, the reaction force transmitted from the handle to the hand is a large force for the handle. It becomes an appropriate urging force.

On the other hand, in order to attach the knob to the operating shaft, the front plate 4 is removed, the slotted rectangular block of the bush 23 is disengaged from the fixing hole 24, and
After rotating the guide rod 21 by 90 degrees with a screwdriver,
The front plate 4 is attached again, and the fixing hole 24 and the slotted rectangular block are fitted to fix the rotation angle position of the guide rod.

Due to the rotation of the guide rod 21, the engaging body 26
is rotated by 90° in the first notch 3e (FIG. 3) of the slider 3, and extends in the width direction of the front plate 4, as shown in FIG. 6b.

In this state, when rotating the knob to move the slider 3 rearward in the lock box, the engaging body 2
6 slips between the engaging portions 3d, 3d at the front end of the slider, so the lever spring 27 cannot be bent. Therefore, in this case, the biasing force of the latch bolt is mainly due to only the elasticity exerted by the retractor spring 7, and is smaller than that of the handle. In other words, it becomes an appropriate biasing force for the knob.

[Other Examples]

In addition, when implementing the present invention, it is not limited to the illustrated embodiment, but can be implemented in various modified forms.

For example, in the illustrated embodiment the lever spring 2
7 is a compression coil spring, but this may also be a tension coil spring. However, in this case, the engaging body 26 is disposed at the rear in the length direction of the guide rod 21, and the rear end of the slider is so that it engages with the part.

〔effect〕

As is clear from the above description, the present invention enables a guide rod, which extends in the front-rear direction and whose front end surface is exposed to the outer surface of the front plate, to be rotatable around its axis in the lock box near the slider. provided, the rotation of the guide rod around its axis is restrained by the guide rod,
Since the engaging body biased forward is movably guided in the length direction of the guide rod, the guide rod can be moved from the outside of the front plate depending on whether the external operating member is a handle or a knob. By rotating the engaging body to engage and disengage it from the slider, the biasing force of the latch bolt can be switched with a simple operation and at the construction site.

Furthermore, since the amount of deflection of the spring is not increased in order to increase the biasing force of the latch bolt, there are various effects such as there is no fear of the spring becoming fatigued.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of an interior lock equipped with a switching device according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a plan view of the slider, and Fig. 4. 5 is a front view of the indoor lock, and FIG. 6 is a perspective view of the guide rod for explaining the operation of the switching device. DESCRIPTION OF SYMBOLS 1... Lock box, 2... Drive cam, 3... Slider, 3a... Engagement part, 4... Front plate, 7...
Retractor spring, 21...Guide rod, 22...Body rod, 23...Guide bush, 24...Fixing hole, 26...Engaging body, 27...Lever spring.

Claims (1)

[Claims for Utility Model Registration] 1. A drive cam supported in the lock box so as to be rotatable around a rotation axis perpendicular to the side plate parallel to the door surface, and a drive cam supported in the lock box so as to be rotatable around a rotation axis perpendicular to the front plate A slider that is guided so as to be movable in the front-rear direction, engages with the drive cam and the latch bolt operating member, and is biased forward in the direction in which the latch bolt projects, in the lock box in the vicinity of the slider. A guide rod extending in the front-rear direction and having a front end surface exposed on the outer surface of the front plate is provided so as to be rotatable around its axis and fixed in its rotation angle position. Rotation about the axis of the guide rod is restricted, and an engaging body protruding in a direction perpendicular to the axis of the guide rod is movably guided in the length direction of the guide rod and biased forward. A guide is formed from the outer surface of the front plate depending on whether the external operating member connected to the drive cam is a handle or a knob. 1. A latch bolt retraction operation force switching device, characterized in that a lever is rotated to engage and disengage an engaging body from an engaging portion of a slider. 2. The guide rod has a non-circular cross-section, and by slidably fitting an opening of the engaging body with the same shape to the non-circular cross-section, rotation of the engaging body about the axis of the guide rod is restrained. A latch bolt retraction operation force switching device according to claim 1 of the registered utility model.