JPH0446464Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a latch device for locking a door to a door frame. The present invention relates to a latch device that has a small door play when the door is locked.

[Conventional technology and problems]

As a latch device for temporarily locking a door to a door frame, a so-called roller latch as shown in FIG. 1 or a so-called triangular latch as shown in FIG. 2 are used, for example. These latching devices are
For example, a roller 3 and a triangular block 4 with a chevron-shaped outer shape are attached to the latch box 2 buried in the upper stile of the door 1 while being biased in a direction protruding outward. Using the relative movement of the strike 5 and the roller 3 or the triangular block 4 in the left and right direction, they are pushed into the latch box 2 by a wedge action, and when the door 1 and the strike 5 are aligned,
The roller 3 or the triangular block 4 is thrown into the strike hole 5a by elasticity to lock the door to the door frame.

However, in the above-mentioned conventional latch device, the strike 5 and the roller 3 or the triangular block 4 are in sliding contact, so that the operation is not smooth in principle. It is even worse if the surfaces of the triangular block 4 etc. become rough due to wear after long-term use.

In addition, since the roller 3 and the triangular block 4 are both tapered, the gap between the door 1 and the strike 5, that is, the so-called dust dimension C in FIGS.
If this changes, the backlash 2g of the door when locked also changes, which is an inconvenience.

[Purpose of invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a latch device which operates smoothly in principle, causes less rattling of the door when the door is locked, and does not change the rattling even when the size of the door changes.

[Means for solving problems]

In order to achieve the above object, the present invention is an elongated rod, the width direction of which is approximately perpendicular to the door surface, and the length direction of which is approximately perpendicular to the edge of the door. In addition to being guided in a movable manner,
A center latch rod that is biased in a direction to project outward, a stopper that restricts the amount of protrusion of the center latch rod from the edge of the door, and an edge of the door outside one side edge of the center latch rod. The first support shaft is buried below and is perpendicular to the center latch rod.
a first retractable latch piece that overlaps with the center latch rod and is swingably supported;
The support shaft has a second collapsible latch piece that is superimposed on the center latch rod and swingably supported on the opposite side of the first collapsible latch piece with respect to the center latch rod, and the center latch rod and the collapsible latch The center latch rod and the collapsible latch piece are connected to each other by the engagement between the connecting pin installed on the surface of one of the pieces facing the other and the elongated hole opened in the other piece, and the center latch rod and the collapsible latch piece are connected to each other. In a normal state where no external force is applied to the piece, the outer edge protruding outside the edge of the door extends substantially perpendicular to the edge of the door.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 3 to 9.

In FIGS. 3 and 4, reference numeral 6 designates a guide frame of a latch device according to an embodiment of the present invention, and this guide frame 6 is a first case plate that is, for example, an elongated rectangular plate having a rectangular opening in the center. 7 (not shown in FIG. 3) and the second case plate 8 with, for example, four caulking pins 9, 9, which connect the four corners of the second case plate 8 to each other.
It is a flat and elongated frame integrally connected by, for example, as shown in FIG. For example, they are buried in the upper stile of the door 1 at an angle such that their length directions are substantially perpendicular to the edge of the door. In the embodiment shown in the third figure, the vertical position of the guide frame 6 is determined so that the upper edge of the guide frame 6 and that of the door 1 are substantially on the same plane.

The first and second case plates 7 and 8 of the guide frame 6
Between them, a center latch rod 10 parallel to these case plates is guided so as to be movable along its length, ie in a direction substantially perpendicular to the edge of the door 1.

Center latch rod 10 in the illustrated embodiment
The first and second center latch plates 11 and 12 each have an elongated rectangular plate shape as a whole.
are joined together by spot welding, for example, and there is a long and narrow rectangular spring hole 1 approximately in the center.
3 is open. And center latch rod 1
0 has its side edges slidably supported and guided by the caulking pins 9, 9, and the opening edge of the spring hole 13 in the longitudinal direction is connected to the first and second case plates 7. , 8, and is slidably engaged with the side edge of the spring receiving plate 14 inserted into the spring hole 13.

With the above configuration, the center latch rod 10
is guided so as to be movable in the longitudinal direction of the door 1 at an angle in which its width direction is substantially perpendicular to the door surface and its length direction is substantially perpendicular to the edge of the door. Note that the steady rest in the thickness direction of the center latch rod 10 will be described later.

The spring receiving plate 14 and the center latch rod 10
A latch spring 15 as a compression coil spring is elastically loaded between the upper opening edge of the spring hole 13, and the elasticity of the latch spring 15 causes the center latch rod 10 to move outward (see Fig. 3). and upward in FIG. 4), but in a normal state where no external force is applied, the spring hole 13
The lower opening edge of the spring retaining plate 14 is engaged with the spring receiving plate 14 to maintain the illustrated position. That is, the spring receiving plate 14 serves as a stopper for the center latch rod.

On the other hand, it is buried under the edge of the door outside one side edge of the center latch rod 10 (on the right side in FIG. 3), that is, on the opposite side of this side edge from the center line of the center latch rod. Latch plate 11,1
The first collapsible latch piece 16 is attached to the first center latch plate 11 by using the crimping pin 9 perpendicular to 2, that is, the upper right crimping pin 9 in FIG.
It is supported so that it can swing by superimposing it on the body. The first retractable latch piece 16 in the illustrated embodiment is a plate-shaped body with a substantially fan-shaped outer shape, and its lower end in FIGS. 3 and 4 is pivotably supported by a crimping pin 9. has been done.

Further, the inner free end of the first retractable latch piece 16,
That is, on the surface facing the first center latch plate 11 at the end that overlaps with the first center latch plate 11,
A connecting pin 18 is integrally implanted, for example, by caulking. As shown in FIG. 3, the connecting pin 18 is slidably fitted into a horizontal elongated hole 19 opened at the upper end of the first center latch plate 11.

Similarly, in FIG. 3, the second retractable latch piece 17 overlaps with the second center latch plate 12 and is swingably supported by using the upper left crimping pin 9 as a second support shaft.

A connecting pin 1 is also attached to the free end edge of this second retractable latch piece 17 on the side opposite to the second center latch plate 12.
8 is integrally implanted, and this connecting pin 18 is slidably fitted into a horizontal elongated hole 19 opened at the upper end of the second center latch plate 12.

In the illustrated embodiment, the shapes and structures of the first and second retractable latch pieces 16, 17 and the members sandwiched between them are symmetrical to each other.

Further, the length of the connecting pin 18 that fits into each elongated hole 19 is set to be equal to or less than the thickness of the center latch plate with which it is engaged.

Furthermore, the first and second retractable latch pieces 1
6, 17, that is, the outer edge 16 on the opposite side from the center latch rod 10 with respect to the crimping pin 9.
a, 17a (FIG. 3) extend substantially perpendicularly to the edge of the door 1, as shown in FIG. 3, in a normal state where no external force is applied to them.

In addition, as is clear from FIG. 4, the steady rest in the thickness direction of the center latch rod 10 is provided at the upper end by the retractable latch pieces 16, 17 inserted between the case plates 7, 8. In addition, the lower end portions are formed by bent portions formed at the lower end portions of the center latch plates 11 and 12, respectively.

[Effect]

The latch device according to one embodiment of the present invention configured as described above, when locking the door to the door frame,
As shown in FIG. 3, the upper ends of the center latch rod 10 and the first and second retractable latch pieces 16, 17 are inserted into the strike hole 5a of the strike 5 provided on the door frame side.

In the locked state shown in the third figure, an external force that attempts to move the door 1 to the left or right pushes the second or first retractable latch piece 17 or 16 inward, respectively. The pushing force is connected pin 1
8 and an elongated hole 19, and is supported on the latch spring 15 via the center latch rod 10. When the pushing force is smaller than the elasticity of the latch spring 15, the collapsible latch pieces 16, 17 do not rotate, and the door 1 is thus elastically locked to the door frame. At this time, as is clear from FIG. 3, even if the dust size changes, the backlash of the door does not change.

In order to open the door 1, when an external force of more than a certain level is applied, for example to the right in FIG. 1. The retractable latch piece 16 is biased counterclockwise in FIG. When this biasing force is converted into a force pushing down the center latch rod 10 and becomes larger due to the elasticity of the latch spring 15, the center latch rod 10 moves downward while compressing the latch spring 15, and in conjunction with this, the first lever is moved downward. The retractable latch piece 16 rotates counterclockwise, and the second retractable latch piece 17
are rotated clockwise, and the amount of protrusion from the edge of the door is reduced (not shown).

Latch pieces 16 and 17 that can be folded so that the door moves to the right.
The amount of rotation of the door also increases until the amount of protrusion from the edge of these doors becomes smaller than the dimension of the door, and the latch is released. Then, due to the elasticity of the latch spring 15, the movable member returns to the position shown in the third figure.

When the door 1 is moved to the left in FIG. 3 in order to close the opened door, the second retractable latch piece 17 first comes into contact with the strike 5, but the subsequent operation is the same as described above, so a detailed explanation will be provided. is omitted.

[Other Embodiments] FIGS. 5 to 7 show other embodiments of the present invention, in which the center latch rod 10 is controlled by a trigger to be described later, and the latching device according to the present invention is used as a locking device. This function has been added.

That is, as shown in FIGS. 6 and 7,
A box-shaped trigger box 21 with one side open is integrally connected to the outer surface of the second case plate 8 so as to cover the second case plate 8, and the trigger box 21 is parallel to the second case plate 8. The trigger 22 is movably guided in a direction perpendicular to the center latch rod 10 by a front plate and an unnumbered guide hole opened in the second case plate 8.

As is clear from FIG. 7, this trigger 22 has a pair of actuating legs 22 parallel to a chevron-shaped protrusion 22a.
b, 22b are integrally connected to each other, and the overall shape is {-shaped. There is.

On the other hand, as shown in FIG. 5, the center portions of both side edges of the first and second center latch plates 11 and 12 are formed to project sideways, and below these projecting portions there is provided an unnumbered engagement. A stop portion is formed. As shown in FIGS. 5 and 7, the inner end of each operating leg 22b of the trigger faces the locking step so as to be able to engage with the locking step.
In a normal state in which no external force is applied to the operating leg 22b, the inner end of each operating leg 22b is spaced apart from the locking step of the center latch rod 10 so as not to interfere with them.

In addition, in FIGS. 5 to 7, the same reference numerals as in FIGS. 3 and 4 indicate parts that are equivalent to those in these figures.

[Effect]

A latch device according to another embodiment of the present invention constructed as described above is used by being attached to the upper free corner of the child door 1 of a double door, for example, as shown in FIG. At this time, the protrusion 22 of the trigger 22
A is attached to the side edge of the door 1, and first and second center latch rods 11, 12, first and second retractable latch pieces 16, 17, etc. are attached to the upper edge so as to protrude, respectively.

In this case, when the main door is open, the trigger 22 is not actuated, so this latch device operates as a latch device similar to that described above, that is, a latch device that elastically locks the child door to the door frame.

When the main door is closed with the child door 1 locked to the door frame, the side edge of the main door 20 pushes the trigger 22 against the elasticity of the trigger spring 23, as shown in FIG. It is pushed into the trigger box 21, and its pair of operating legs 22b, 22b engage with the locking steps (FIG. 5) of the center latch rod 10.

As a result, the center latch rod 10 and the first and second retractable latch pieces 16 connected thereto,
17 is restrained by trigger 22 and cannot move.
Child door 1 is locked. In this locked state, the main door 20
Of course, it can be canceled by opening the .

In this way, if other embodiments of the present invention are applied to double doors, there will be no need for a fixing device such as a so-called French drop on the child door, and when the parent door is opened, the child door will also open automatically. It is ideal for use as an emergency exit locking device because it allows the door to be closed and provides a large opening at the doorway.

〔effect〕

As is clear from the above description, the present invention rotates the retractable latch piece without using a wedge action when the strike on the door frame side engages with the retractable latch piece, and Since the rotational force is efficiently transmitted to the center latch rod through the engagement between the connecting pin and the elongated hole, the operation of the latch device is extremely smooth.

In addition, when the door is locked, the outer edge of the retractable latch piece is almost perpendicular to the edge of the door, so even if the gap between the door and the door frame, that is, the size of the crack, changes, the door play remains constant and small. It has various effects, such as being able to suppress

In the illustrated embodiment, the connecting pin is provided on one side of the retractable latch, and the elongated hole is provided on the rod side of the center latch, but it goes without saying that the opposite may be used.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining the structure of a conventional latch device, FIG. 3 is a front view of a latch device according to an embodiment of the present invention with the case plate removed, and FIG. 5 is a front view similar to FIG. 3 of a latch device according to another embodiment of the present invention, FIG. 6 is a longitudinal sectional view thereof, FIG. 7 is a plan view thereof, and FIG. 8 is a view of this latch device. FIG. 9 is a perspective view showing the device attached to the door, and a plan view similar to FIG. 7 showing the operation of the trigger. 10... Center latch rod, 11... First center latch plate, 12... Second center latch plate,
15... Latch spring, 16... First retractable latch piece, 17... Second retractable latch piece, 18... Connection pin, 19... Elongated hole.

Claims (1)

[Claims for Utility Model Registration] 1. An elongated rod whose width direction is approximately perpendicular to the door surface and whose length direction is approximately perpendicular to the edge of the door;
A center latch rod that is movably guided in the longitudinal direction at the edge of the door and is biased in a direction that projects outward, and a stopper that restricts the amount of protrusion of the center latch rod from the edge of the door. and,
A first support shaft is buried under the edge of the door outside one side edge of the center latch rod, and is supported by a first supporting shaft perpendicular to the center latch rod so as to overlap the center latch rod and be swingable. The retractable latch piece and the second support shaft disposed at a position symmetrical to the first support axis with respect to the center latch rod overlap with the center latch rod on the side opposite to the first retractable latch piece with respect to the center latch rod. a second retractable latch piece that is swingably supported by the center latch rod, and a connecting pin that is implanted on a surface of either the center latch rod or the retractable latch piece that faces the other;
By engaging with the elongated hole opened on the other side, the center latch rod and the retractable latch piece are interconnected, and in a normal state where no external force is applied to the retractable latch piece, it protrudes outside the edge of the door. A latch device characterized in that its outer edge extends substantially perpendicular to the edge of the door. 2. The latch device according to claim 1, wherein the connecting pin is embedded in the retractable latch piece. 3. The latch device according to claim 1, wherein the connecting pin is embedded in the center latch rod.