JPH0255591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a latch device for a building door, etc., and more particularly to a latch device that is extremely smooth in operation.

[Conventional technology and problems]

Conventional latch devices have a slope formed on the head, a latch bolt that is biased in a direction protruding from the free edge of the door, and a latch bolt that is controlled in conjunction with a knob, handle, etc. provided on the door surface. It has an operating mechanism. When closing the door, the latch bolt is pushed into the lock box by the wedge action generated by the contact between the slope of the latch bolt and the door frame, and then the head of the latch bolt is pressed against the latch bolt of the strike plate by the urging force of the latch bolt. When the latch bolt is inserted into the latch hole and the door is opened, an external operating member such as a knob or a thumb latch is operated to pull the latch bolt out of the latch bolt latch hole and unlock the door.

However, in the conventional latch device having the above-mentioned configuration, when the door is opened, the latch bolt is moved in a direction perpendicular to the free edge of the door. There is always sliding contact with the impact surface of the handle, and at that time you will feel resistance in your hand. In particular, if the door is poorly installed and a large lateral pressure is applied to the latch bolt head,
It is inconvenient and uncomfortable to use because it requires a large operating force, and it often generates noise.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a latch device that operates extremely smoothly, especially when opening a door.

[Means for solving problems]

In order to achieve the above object, the present invention provides a latch block support that is movably guided in the front and rear directions perpendicular to the free edge of the door in the lock box and protrudes from the front end of the door on the free edge side. In addition, there is a slider biased forward, a latch lever supported and guided by the slider so as to be movable in the front-rear direction, a stop surface having the same vertical generatrix, and an oblique surface in front of the stop surface. A latch block is formed with intersecting slopes and a curved surface portion projecting rearward at the rear end of the slope, and a portion of the rear end near the above-mentioned stop surface is pivotally connected to the front end of the latch rod. , a locking mechanism that is integrally attached to the slider and that removably locks the latch rod to the slider in conjunction with an external operating member, and the latch rod is locked to the slider via the locking mechanism. In addition, the curved surface portion of the latch block and the latch block support portion of the slider are in contact with each other in a normal state in which the blocking surface of the latch block is approximately parallel to the door surface.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 indicates a lock box, and this lock box 1 is housed in a lock box cavity formed at the free end edge of the door and fixed with bolts.

Inside the lock box 1, there is provided a slider, the entirety of which is indicated by the reference numeral 2. In the illustrated embodiment, the slider 2 is formed by bending a plate material into a box shape with one side open, and its front end (see FIGS. 2 and 3).
A latch block support portion 4 for controlling the rotation of a latch block 3, which will be described later, is integrally protruded from the left end in the figure. In the illustrated embodiment, as is clear from FIGS. 1 and 2, this latch block support 4 is connected to an upper plate 2a and a lower plate 2b of the slider 2.
is in the form of a pair of horizontal edges extending forward.

On the other hand, a latch spring receiving plate 5 having an L-shaped cross section is fixed to the inner surface of one side plate of the lock box 1 by, for example, caulking (see FIG. 3), and the latch spring receiving plate 5 has an L-shaped cross section.
The latch spring receiving plate 5 is housed in the opening of the box-shaped portion and is slidably engaged with the latch spring receiving plate 5.

Further, as will be described later, the slider 2 is integrally connected to a latch block 3, and the latch block 3 is movable in the front-back direction through a latch hole 7 opened in a front plate 6 attached to the free edge of the door. are guided by. Therefore, the slider 2 is guided so as to be movable within the lockbox 1 in the front-rear direction (left-right direction in FIGS. 2 and 3) perpendicular to the free edge of the door.

On the other hand, the slider 2 carries a latch rod 8. As shown in FIG. 4, this latch rod 8 is a plate-shaped rod in which, for example, a rectangular head with a part of the front edge cut obliquely and an elongated main body are integrally connected. A first connecting pin hole 8a is located near one side edge of the front end, a spring hooking pin hole 8b is located near the first connecting pin hole 8a, and a locking hole 8c is located at the rear end of the main body. The opening extends through the rod 8 in the thickness direction.

On the other hand, the front plate 2c (FIG. 2) and rear plate 2d (FIG. 1) of the slider 2 are transparently provided with rectangular openings that slidably fit into the main body of the latch rod 8. The rod 8 is supported and guided so as to be movable back and forth relative to the slider 2, with its main body inserted through these openings.
As shown in FIG. 1, the portion of the latch spring receiving plate 5 inside the slider 2 that interferes with the latch rod 8 is cut out.

A latch spring 10 as a compression coil spring is elastically mounted between the front plate 2c of the slider and the latch spring receiving plate 5 in the slider so as to wrap around the main body of the latch rod 8. Therefore, the slider 2 is located on the left (front) in Figures 2 and 3.
is energized by

On the other hand, a latch block 3 is pivotally mounted to the front end of the latch rod 8 so as to be rotatable about a vertical axis.

This latch block 3 has a blocking surface 3a that comes into contact with the opening edge of the latch insertion hole 11 of the strike plate 9 (FIG. 3) fixed to the door frame and locks the door to the door frame.
, a slope 3b obliquely intersecting the blocking surface 3a at the front thereof, and a curved surface portion 3c projecting rearward at the rear end of the slope 3b. Impact surface 3
a, the inclined surface 3b and the curved surface portion 3c have the same direction of generatrix, and the direction of the generatrix is approximately vertical when the latch block 3 is attached to the lock box 1 via the latch rod 8 and the slider 2.

Further, at the center of the rear end of the latch block 3, a horizontal notch 3d is formed to receive the head of the latch rod 8, as shown in FIG.

Furthermore, a second connecting pin hole 3e that passes through the latch block 3 in the vertical direction is formed in a portion of the rear end of the latch block near the blocking surface 3a.

As shown in FIGS. 1 to 3, the latch block 3 and the latch rod 8 are aligned so that the second connecting pin hole 3e of the latch block and the first connecting pin hole 8a of the latch rod (FIG. 4) are aligned. Insert the tip of the latch rod into the notch 3d of the latch block so that the first and second connecting pin holes 8a and 3
They are integrally connected by passing a connecting pin 12 through e. The connecting pin 12 is rotatably fitted into the first connecting pin hole 8a and/or the second connecting pin hole 3e, so that the latch block 3 is rotatable relative to the latch rod 8. It is pivoted to.

Also, as is particularly clearly shown in FIG. 3, the vertical inner surface of the notch 3d (FIG. 4) of the latch block is inclined forward toward the inclined surface 3b to form the inclined inner surface 3f.
On the other hand, since the front edge of the latch rod 8 facing the inclined inner surface 3f is obliquely shaved as described above, the latch block 3 can be rotated by a certain angle clockwise in FIG. It's becoming like that.

Although this is not an essential component of the present invention, one of the inner surfaces perpendicular to the connecting pin 12 of the notch 3d (FIG. 4) of the latch block is partially cut out to form the spring hook step 3g (FIG. 1). and FIG. 4), and a spring hook pin 13 is driven into the spring hook hole 8b (FIG. 4) of the latch rod. As shown in FIGS. 2 and 3, the portion of the connecting pin 12 exposed in the notch 3d of the latch block is provided with a torsion screw whose both ends are brought into elastic contact with the spring hook step 3g and the spring hook pin 13, respectively. A latch block spring 14 as a coil spring is wound around the latch block 3, and the elasticity of the latch block spring 14 causes the latch block 3 to
Although the force is applied in the counterclockwise direction in the figure, in the normal state where the blocking surface 3a is approximately parallel to the door surface,
The blocking surface 3a is engaged with the edge of the opening of the latch hole 7 in the front plate 6, thereby stably maintaining the position shown in the third figure. The latch block spring 14 is used to ensure the rotation of the latch block 3 to return to its original position, which will be described later.

In addition, as shown in Figures 1 and 4, the upper and lower surfaces of the latch block 3 are cut horizontally by a predetermined amount leaving the rear end. ) is formed. As shown in FIG.
The latch block 3 supported by the latch block 3 is latched to the front plate 6 to maintain stable operating positions in the normal state.

On the other hand, at the rear end of the slider 2, as shown in FIGS. 2 and 3, a locking mechanism, generally designated by reference numeral 15, is integrally attached to the slider.

This locking mechanism 15 has a selector 16 as shown in FIG. 1, for example. This selector 16
An actuating piece 16b is integrally formed by vertically bending one end of the elongated rectangular first connecting piece 16a, and an L-shape is formed by bending the other end of the first connecting piece 16a in the direction in which the actuating piece 16b is formed. second connection piece 16c
The supporting piece 16d is formed by bending the free end side edge of this second connecting piece so as to be parallel to the actuating piece 16b.
A selector pin 17 is implanted on the surface facing the actuating piece 16b of d.

The selector 16 configured as described above engages the first and second connecting pieces 16a and 16c with notches formed on the rearward extending side edges of the upper plate 2a and lower plate 2b of the slider 2. , first connection piece 1
The lower surface of the slider 6a in FIG. 1 is brought into sliding contact with one side plate of the lock box 1, so that the rear end of the slider 2 can be moved in a direction perpendicular to its biasing direction (vertical direction in FIG. 2). being guided.

Further, as shown in FIG. 2, a selector spring 18 as a compression coil spring is elastically mounted between the support piece 16d and the extension portion of the lower plate 2b of the slider.
Due to the elasticity of the selector spring 18, the selector 1
6 is biased upward.

Note that the opening position of the locking hole 8c in the latch rod 8 is such that the stepped portion of the head of the latch rod 8 is located close to the slider 2.
The selector pin 17 is set to engage with the locking hole 8c when the selector pin 17 comes into contact with the front plate 2c. When the selector pin 17 is engaged in the locking hole 8c of the latch rod, the latch rod 8 is removably locked to the slider 2 via the selector 16 and the selector pin 17.

Furthermore, the formation positions of the latch block support parts 4, 4 at the front end of the slider 2 are as shown in FIGS.
In the normal state shown in the figure, that is, the latch rod 8 is locked to the slider 2, and the latch block's abutment surface 3a is
The latch block support portions 4, 4 and the curved surface portion 3c of the latch block 3 are arranged so as to abut each other when the latch block support portions 4, 4 are substantially parallel to the door surface.

On the other hand, as shown in FIGS. 2 and 3, a release lever 19 is disposed within the lock box 1 behind the locking mechanism 15.

In the illustrated embodiment, the release lever 19 is a plate member whose overall shape is, for example, a substantially L-shape, one end of which is rotatably supported by a support shaft 21, and the rear side end of the other end. The driven arm 19 is bent vertically.
It forms a. This driven arm 19a extends outward, and its outer end protrudes outside the lock box 1 (see FIG. 5). Further, a leaf spring 22 is elastically loaded on the back side of the driven arm 19a.
The release lever 19 is biased clockwise in FIG. 2 by the elastic force of 2, but it is locked by a stopper shaft 23 that loosely fits into a stopper hole 19b opened at the other end, and is normally in the position shown in the second diagram. I'm keeping it. In the normal state in which the driven arm 19a is in contact with the stopper shaft 23, the tip of the actuating arm 19c extending forward from one end of the release lever is close to the actuating piece 16b of the selector 16 and faces the upper surface thereof.

Further, the tip of the drive arm 24 faces in front of the outer end of the driven arm 19b.

As shown in FIGS. 5 and 6, this drive arm 24 is rotatably supported via a bar shaft 26 on a bar bottom 25 attached to the outer surface of the door, for example.
It is integrally coupled to the inner end of a bar support arm 28 which has a bar 27 coupled to its outer end. The bar support arm 28 and the drive arm 24 integral therewith are
As shown in FIG. 6, it is biased counterclockwise in FIG. 6 by the elasticity of a restoring spring 29 as a compression coil spring installed in the bar seat 25, but in the normal state when the bar 27 is not operated. is locked to the stop pin 31 as shown in FIG.
maintains a relative position perpendicular to the side plate of the lockbox 1, for example.
In this state, as shown in FIG. 2, the tip of the drive arm 24 and the driven arm 19a are separated.

[Effect]

In the latch device according to one embodiment of the present invention constructed as described above, when the door is closed as shown in FIGS. 2 and 3, the latch block 3 is inserted into the latch insertion hole 11 of the strike plate 9, The blocking surface 3a abuts against the opening edge of the latch insertion hole 11 to lock the door to the door frame, as in the conventional latch device.

However, in the conventional latch device, the force for locking the door is applied as lateral pressure to the head of the latch bolt, so that the latch bolt is strongly pressed against the opening edge of the latch hole in the front plate, but in the latch device according to the present invention, The force locking the door acts to rotate the latch block 3 clockwise in FIG. Therefore, the latch block 3 tries to rotate around the connecting pin 12, but this rotation moves the slider 2 rearward (inside the lock box) via the latch block support parts 4, 4 of the slider that are in contact with the curved surface part 3c of the latch block. ) is converted into a pushing motion. However, as described above, the slider 2 is relatively locked to the latch rod 8 via the locking pin 17, and this latch rod 8 is connected to the latch block 3 via the connecting pin 12, so the The force that locks the door is provided by the connecting pin 12 and the locking pin 17.
The latch block 3, the latch rod 8, and the slider 2 are supported as an internal force, which are connected to each other via the latch block 3, latch rod 8, and slider 2.

When opening the door, pull the bar 27 toward you as shown in FIG.

Then, as shown in FIGS. 7 and 8, the tip of the drive lever 24, which is integrated with the bar 27, moves in a direction approaching the driven lever 19a, and as shown in FIG. Rotate the release lever 19 counterclockwise against this. As a result, the tip of the actuating arm 19c pushes the selector 16 downward against the elasticity of the selector spring 18, and the stopper hole 19 opened at the other end of the release lever 19
At the maximum rotational position of the release lever 19 where the front opening edge of the lever b is locked to the stopper shaft 23, the selector pin 17 is completely pulled out from the locking hole 8c of the latch rod 8, and the slider 2 and the latch rod 8 are The engagement with is released.

In this state, if you pull the bar 27 (see FIGS. 5 and 7) further toward you without releasing it, the lock box 1 will move against the strike plate 9 fixed to the door frame as shown in FIG. 10. When it is moved relatively downward, the opening edge of the latch insertion hole 11 pushes the stop surface 3a of the latch block 3, as shown in FIGS. 9 and 10, and it moves clockwise in FIG. Try to rotate it.

This rotation causes the latch lock spring 14 to
The latch block 3 resists the elasticity of the connecting pin 12.
The slider 2 rotates around , and its curved surface portion 3c moves backward along an arc while slidingly contacting the latch block support portions 4, 4, so that the slider 2 is pushed backward against the elasticity of the latch spring 10. . In this case, since the latch rod 8 and the slider 2 are disengaged as described above, their relative movement is free, and therefore the latch block 3 can be rotated as described above.

When the latch block is rotated by a certain angle, for example, as shown in FIG.
b comes into contact with the opening edge of the latch hole 7 (FIG. 1) on the indoor side, or, although not shown, with the front inclined edge of the latch rod 8 and the inclined inner surface 3f of the notch of the latch block (see FIG. 3). contact, and further rotation is prevented. After that, as is clear from FIG. 10, the blocking surface 3a of the latch block functions as a slope, and due to the wedge action acting between this and the opening edge on the outdoor side of the latch insertion hole 11, As the door moves further in the opening direction, the slider 2 is pushed into the lockbox 1 together with the latch block 3 and latch rod 8, and finally the latch block 3 is completely detached from the strike plate and becomes free, allowing the door to open. is completely unlocked from the door frame.

When the latch block 3 becomes free, the latch block supports 4, 4 of the slider push the curved surface 3c outward due to the elasticity of the latch spring 10, and the latch block 3 rotates counterclockwise in FIG. 8
Returns to the state shown. Latch block spring 14
As mentioned above, is provided only to facilitate the return rotation of the latch block, and is not an essential component of the present invention.

When the bar 27 is released from the bar 27 or when the bar 27 is pushed toward the indoor side to close the door, the tip of the drive arm 24 is moved by the elasticity of the restoring spring 29 to the driven arm, as is clear from FIG. 19
As a result, as shown in FIG. 2, the release lever 19 is returned to its normal state by the elasticity of the leaf spring 22, and the selector 16 is returned to its normal state by the elasticity of the selector spring 18, as shown in FIG. As a result, the latch rod 8 is relatched to the slider 2.

When closing the door in this state, the slope 3b of the latch block performs the same function as the slope of the latch bolt in the conventional latch device, and the latch block 3, latch rod 8, and slider 2 are held together against the elasticity of the latch spring 10. Move it backwards and insert the latch hole 7 of the lock box and the latch insertion hole 1 of the strike plate.
1, the latch block 3 is automatically inserted into the latch insertion hole 11 by the elasticity of the latch spring.

〔effect〕

As is clear from the above description, the present invention provides a latch rod that is guided in a lock box so as to be movable in the front and back directions, has a latch block support portion protruding from the front end, and is biased forward. The latch block is rotatably supported at the front end of the latch rod, and the latch block is normally rotated by the latch block support portion of the slider which is engaged with the latch rod by a locking mechanism. The door can be locked to the door frame in the same way as a normal latch bolt, and when the door is opened, the locking mechanism is operated by an external operating member to engage the latch rod and the slider. The door is unlocked by allowing the latch block to rotate rather than retracting the latch block, and after a certain rotation of the latch block, its impact surface and The wedge action between the opening edges of the latch insertion hole pushes the latch block into the lockbox as the door opens, resulting in extremely smooth operation of the latch device when the door is opened. be.

The latch device according to the illustrated embodiment also includes a first
As is clear from the figures and FIG. 2, the latch block and latch rod can be pulled out of the lock box by removing the front plate of the lock box and releasing the locking mechanism. After that, by changing the direction of the impact surface and inserting the latch rod through the slider again, the same latch device can be used for both inward-opening doors and outward-opening doors, as well as left-opening doors and right-opening doors. Another advantage arises in that it can also be applied to

[Other Examples]

Note that the present invention is not limited to the illustrated embodiments, and can be implemented with various modifications.

For example, the locking mechanism in the illustrated embodiment has a locking hole in the latch rod and a selector pin on one side of the selector support. The locking hole may be opened and a pin may be implanted on the latch rod side (not shown).

Furthermore, in the illustrated embodiment, the selector pin is guided so as to be linearly movable in the slider. By swinging the lever, the selector pin moves in the thickness direction of the latch rod so that it can move in and out of the locking hole (not shown), and the other end of the lever can be operated directly or via a release lever. Of course, it is also possible to do so.

Furthermore, in the illustrated embodiment, the movement of the external operating member outside the lockbox is transmitted to the locking mechanism via the release lever, but when the external operating member, such as a thumb latch, moves in the vertical direction, It is also possible to operate the locking mechanism directly with the operating member.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the components of a latch device according to an embodiment of the present invention, FIG. 2 is a partially sectional side view of the latching device in a normal state, and FIG. 3 is a partially sectional plan view thereof. Fig. 4 is a perspective view of the external appearance of the latch block and latch rod, Fig. 5 is a perspective view showing the relationship between the lock box and the external operating member, Fig. 6 is a cross-sectional view of the external operating member support part in the normal state, and Fig. 7 is 6 is a sectional view similar to FIG. 6 showing a state in which the external operating member is operated; FIG. 8 is a partially sectional side view of the latch device in a state in which the latch rod and the slider are disengaged;
FIG. 9 is a partially sectional side view of the latch device with the latch block rotated, and FIG. 10 is a partially sectional plan view thereof. 1...Lock box, 2...Slider, 3...Latch block, 3a...Block surface, 3b...Slope, 3c...
...Curved surface part, 4...Latch block support part, 5...
Latch spring receiving plate, 8... Latch rod, 8c... Locking hole, 10... Latch spring, 12... Connection pin,
15...Lock mechanism, 16...Selector, 17...
Selector pin, 18...Selector spring.

Claims (1)

[Scope of Claims] 1. The latch block is guided so as to be movable in the front and back direction perpendicular to the free edge of the door within the lock box, and has a latch block support portion protruding from the front end of the free edge of the door,
A slider biased forward, a latch rod movably supported and guided by the slider in the front-rear direction, a stop surface that shares the same vertical generatrix, and a stop surface diagonally intersecting the stop surface in front of the stop surface. a latch block forming a slope and a curved surface portion projecting rearward at the rear end of the slope, and a latch block having a rear end close to the stop surface rotatably connected to the front end of the latch rod; A locking mechanism is integrally attached to the slider and interlocks with an external operating member to removably lock the latch rod to the slider, and the latch rod is locked to the slider via this locking mechanism, and . A latch device characterized in that in a normal state in which the blocking surface of the latch block is substantially parallel to the door surface, the curved surface portion of the latch block and the latch block support portion of the slider are in contact with each other. 2. The locking mechanism has a selector pin movably guided in the slider in a direction perpendicular to the latch rod and biased in a direction approaching the latch rod;
2. The latch device according to claim 1, wherein the latch rod is locked to the slider by engaging the selector pin with a locking hole opened in the latch rod. 3. The locking mechanism has a support piece parallel to the latch rod that is movably guided in the slider in a direction perpendicular to the latch rod and is biased in a direction approaching the latch rod, and has an opening in the support piece. 2. The latch device according to claim 1, wherein the latch rod is locked to the slider by engaging a selector pin protruding from the latch rod into the locking hole.