JPH086997Y2 - Latch device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch device used for locking a door.

[0002]

2. Description of the Related Art Opening and closing members such as opening and closing doors can generally be locked at a closed position by a latch device.

FIG. 11 shows a conventional structure of a latch device of this type. The latch device is attached to the device body 10, and when the opening / closing door 12 is closed, the latch device is pressed against the tip of a boss 14 projecting from the back surface of the opening / closing door 12 and moved.
Are to be pushed into the housing 18.
By this pushing operation, the pair of arms 20 provided on the mover 16 hits the opening edge of the housing 18 and opens and closes in the direction of the arrow A to grip the tip enlarged diameter portion 14A of the boss 14 from both sides and at the same time. The mover 16 is locked to the housing 18 so that the opening / closing door 12 can be locked at the closed position.

However, in this structure, the arm 20
By opening and closing of the boss 14, the expanded diameter portion 14A of the boss 14 is gripped, so that when a large force such as pulling the arm 20 acts via the boss 14, the hinge portion 13 is deformed, and the arm 20 moves away from the arm 20. The boss 14 might come out. Further, the hinge portion 13 may be fatigued and damaged due to repeated opening and closing of the arm 20.

[0005]

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to obtain a latch device capable of firmly locking a protrusion such as a boss of an opening / closing door.

[0006]

In a latch device according to the present invention, a housing attached to a main body, a moving element reciprocally inserted into the housing, and a biasing element for pulling out the moving element. A biasing means, a guide protrusion provided in the housing, and a circulation formed along the outer circumference of the moving element and guided by the guide protrusion to act on the moving element into a rotational force of the moving element. A guide groove, a locking portion that is recessed in the groove wall of the circulation guide groove and that is locked or unlocked by the guide protrusion by the pushing operation of the moving element, and extends from the tip of the moving element, And a pair of hooks facing each other for locking the constricted portion of the protrusion protruding from the opening / closing door attached to the main body portion by a rotating operation.

[0007]

According to the present invention having the above-mentioned structure, when the moving element is pushed while the pair of hooks are expanded by the tip of the projection provided on the opening / closing door, the moving element resists the urging force of the urging means into the housing. Pushed in. At this time, the circulation guide groove is guided by the guide protrusions, and the pressing force acting on the moving element is converted into the rotational force of the moving element. As a result, the hook provided at the tip of the moving element rotates to lock the constricted portion of the protrusion and lock the opening / closing door.

Here, when the mover is pushed into the housing, the guide projection locks the locking portion, so that the mover is maintained in the housing against the urging force acting in the pull-out direction. .

As described above, according to the present invention, unlike the conventional latch device, the arm is not pressed against the housing to clamp the protrusion from both sides, but the constricted portion of the protrusion is locked by the rotating operation of the hook. Therefore, even if an unreasonable force acts to pull out the protrusion, the hook can be firmly locked without the hook being deformed.

[0010]

1 to 5, a latch device 30 according to this embodiment is shown.

The housing 42 of the latch device 30 is inserted and locked in the mounting hole 40 of the mounting plate 38 as shown in FIG. The housing 42 has a flange 44 and a claw 46 on one end side.
And have. The claw 46 has a cantilevered arm shape, and the tip thereof is in a state of protruding toward the flange 44 and gradually protruding from the outer periphery of the housing 42. Therefore, when the housing 42 is inserted into the mounting hole 40, the flange 44 and the claw 4 are
6 holds the peripheral portion of the mounting hole 40 and locks the housing 42 to the mounting plate 38. The outer shape of the housing 42 is substantially rectangular in cross section so that it will not rotate accidentally when inserted into the mounting hole 40.

A substantially circular bottomed hole 48 is formed in the housing 42 on the flange 44 side, and a shaft 50, which is a moving element, is inserted into the bottomed hole 48 so as to be axially pushed. A claw 51 is formed on the inner peripheral wall of the bottomed hole 48 so as to face the shaft 50, and acts as a retainer for the shaft 50 corresponding to a step 50A formed near the tip of the shaft 50.

At one axial end of the shaft 50, a plate-like hook 62 is provided so as to face each other. At the tip of the hook 62, a thickened claw portion 6 is formed in the direction of approaching each other.
2A is formed.

A compression coil spring 54 is interposed between the shaft 50 and the housing 42 for urging the shaft 50 in a counter-pushing direction (to the right in FIG. 2) and resists the urging force of the compression coil spring 54. The shaft 50 is pushed into the housing 42.

A circulation guide groove 56 is integrally formed on the outer periphery of the shaft 50 so that the rotation angle at the time of pushing can be controlled. More specifically, as shown in FIG. 1, a guide protrusion 5 having a substantially triangular shape is formed on the inner circumference of the housing 42.
8 is integrally formed, and the guide protrusion 58 is fitted in the circulation guide groove 56.

As shown in the development view of FIG. 5, the circulation guide groove 56 is formed by forming two sets of vertically elongated grooves 56A and 56B which are continuous in the circumferential direction (vertical direction in FIG. 5) of the shaft 50. , It is a ring connected in series. That is, the longitudinal grooves 56A and 56B are alternately arranged and communicate with each other at the ends. In the limit of movement of the shaft 50 in the direction opposite to the pushing direction, the longitudinal groove 5 on the side of the shaft pushing direction (left side in FIG. 5).
The guide protrusion 58 is located between 6A and 56B (see the guide protrusion 58D in FIG. 5).

When the guide protrusion 58 is located at this position, the hook 62, as shown in FIG.
The engaging projections 64C and 64D of No. 4 are in the rotational position where they can be inserted.

Although the guide protrusion 58 advances in the directions of arrows A and B in FIG. 5 in the longitudinal grooves 56A and 56B, the guide protrusion 58
When traveling in the vertical groove 56A, when traveling in the vertical groove 56B to the side opposite to the pushing direction of the shaft 50 (right side in FIG. 5),
Vertical groove 56 so that it moves to the pushing direction side (left side in Fig. 5)
A and 56B are inclined.

The circulation guide groove 56 is provided in the shaft 50.
2 is formed between the longitudinal grooves 56A and 56B on the side opposite to the pushing direction (right side in FIG. 5) adjacent to each other, and the mountain groove 56E is formed on the pushing direction side of the circulation guide groove 56. , 56F are formed so as to face each other, and each time the shaft 50 is pushed, it can be rotated by approximately 90 degrees.

That is, the shaft 50 is pushed from the movement limit (the position of the guide protrusion 58D) of the shaft 50 where the guide protrusion 58 is located between the longitudinal grooves 56A and 56B on the shaft pushing direction side (the left side in FIG. 5). Then, the guide protrusion 58 is guided by the longitudinal groove 56A and moves in the direction of the arrow A to reach the chevron groove 56E (the position of the guide protrusion 58A), and the shaft 50 cannot be pushed any further at this position. Here, when the pushing of the shaft 50 is stopped, the shaft 50 is biased by the compression coil spring 54 to move in the counter-pressing direction, and the guide protrusion 58 is engaged with the chevron groove 56G by this movement (position of the guide protrusion 58B). . By this engagement, the shaft 50 is rotated by about 90 degrees and the housing 4 is rotated.
It is designed to be locked to 2. Further, when the shaft 50 is further pushed in from this state, the guide protrusion 58 reaches the chevron groove 56F (the position of the guide protrusion 58C), and the shaft 50 cannot be pushed any further at this position. here,
When the pushing of the shaft 50 is stopped, the shaft 50 is biased by the compression coil spring 54 to move in the counter-pushing direction, and by this movement, the guide protrusion 58 is guided by the longitudinal groove 56B and moves in the direction of the arrow B, and the shaft pushing-in direction. Side (left side in FIG. 5) between the vertically elongated grooves 56A and 56B (guide protrusion 58).
D position), the shaft 50 is further rotated by approximately 90 degrees at this position.

As shown in FIG. 6, the opening / closing door 32 has a pin 3
It is rotatably supported by the main body 34 of the device through the shaft 3.
The opening / closing door 32 is provided with a boss 64 on the back surface on the side opposite to the shaft supporting portion for the device body 34.

As shown in FIG. 7, engagement projections 64A, 64B, 64C and 64D which are tapered around the axis of the boss 64 are formed around the tip of the projection 64. As shown in FIG. 8, the engagement protrusions 64C and 64D elastically deform and push apart the pair of hooks 62 when the opening / closing door 32 is closed, pass between the claw portions 62A of the hooks 62, and the inclined surfaces 64E form the hooks 62E. It comes into contact with the claw portion 62A (see FIG. 9).

Further, as shown in FIG. 10, when the hook 62 rotates and the face 67 of the boss 64 contacts the claw portion 62A,
The boss 64 is firmly locked to the hook 62. The inclined surface 64E of the boss 64 is a gentle inclined surface, and the hook 62 rotates 90 degrees from the state of FIG.
The inclined surface 64E corresponds to this, and the boss 64 can be pulled out from the hook 62 by the opening operation of the opening / closing door 32.

Next, the operation of this embodiment will be described. FIG. 2 shows the open / close door 32 in an open state. In this state, the shaft 50 is biased by the compression coil spring 54 and is positioned at the limit of movement in the counter-pushing direction (right direction in FIG. 2), and the guide protrusion 58 is located between the longitudinal grooves 56A and 56B on the shaft pushing direction. (Fig. 5 Guide protrusion 58D
reference).

From this state, as shown in FIG.
When 2 is closed, the boss 64 of the opening / closing door 32 hooks 62.
Is inserted into. By this pushing operation, the shaft 5
0 is pushed in, the guide projection 58 is guided by the vertically long groove 56A to reach the chevron groove 56E, and the shaft 50 cannot be pushed any further (see FIG. 5 guide projection 58A). When the closing operation of the opening / closing door 32 is stopped here, the shaft 50 is biased by the compression coil spring 54 and moves in the counter-pushing direction, and this movement causes the guide protrusion 58 to engage with the chevron groove 56G (FIG. 5 guide protrusion). 58B). By this engagement, the shaft 50 is locked to the housing 42 at a position rotated by approximately 90 degrees, and the rotation of the shaft 50 causes the hook 62 to rotate 90 degrees so that the claw portion 62A locks the face 67 of the boss 64.

As a result, the opening / closing door 32 is locked at the closed position so that the opening / closing door 32 is not opened accidentally.

To open the opening / closing door 32 from this state, the opening / closing door 32 may be pushed in to push the shaft 50 deeper. When the shaft 50 is pushed in, the guide projection 58 is engaged with the chevron groove 56G and reaches the chevron groove 56F (the position of the guide projection 58C).
Cannot be pushed any further. Here, when the pushing of the opening / closing door 32 is stopped, the shaft 50 is biased by the compression coil spring 54 to move in the opposite pushing direction, and by this movement, the guide projection 58 is guided in the longitudinal groove 56B and moves in the arrow B direction. The shaft 50 is rotated approximately 90 degrees between the longitudinal grooves 56A and 56B on the shaft pushing direction side (the guide protrusion 5).
8D position). As shown in FIG. 4, the rotation of the shaft 50 causes the hook 62 to rotate 90 degrees, the claw portion 62A abuts the inclined surface 64E, and the boss 64 can be pulled out.

As a result, the opening / closing door 32 can be opened. The vertical grooves 56A and 56B are tapered so that the sliding resistance when the guide projection 58 moves in the direction of arrow A in FIG. In order to reduce the sliding resistance before moving in the direction A and reaching the chevron groove 56E, FIG.
If a step is set in the portion 56H indicated by the alternate long and short dash line,
It is possible to give moderation to the pushing of the shaft 50,
The opening / closing operability of the opening / closing door 32 is improved.

Further, in this embodiment, since the circulation guide groove 56 and the guide protrusion 58 for rotating the shaft 50 each time the shaft 50 is pushed are integrally formed on the outer periphery of the shaft 50 and the inner periphery of the housing 42, the number of parts is small. Since the shaft 50 can be rotated every time it is pushed in, the cost is low. The circulation guide groove 56 is formed in the housing 42.
The guide protrusion 58 may be integrally formed on the inner periphery of the shaft 50 and on the outer periphery of the shaft 50. In addition, the circulation guide groove 56
Is not limited to the above-described configuration, and any structure that can rotate the shaft 50 by a predetermined angle each time the shaft 50 is pushed is applicable.

[0030]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, the protrusions such as the boss of the opening / closing door can be firmly locked. Further, since the hook does not open and close but rotates to lock the protrusion, damage due to fatigue does not occur unlike the conventional latch device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a latch device according to an embodiment.

FIG. 2 is a cross-sectional view showing an operation of the latch device according to the present embodiment.

FIG. 3 is a cross-sectional view showing the operation of the latch device according to the present embodiment.

FIG. 4 is a cross-sectional view showing the operation of the latch device according to the present embodiment.

FIG. 5 is a development view of a circulation guide groove.

FIG. 6 is a cross-sectional view of the opening / closing door to which the latch device according to the present embodiment is attached.

FIG. 7 is a perspective view showing a hook and a boss of the latch device according to the present embodiment.

FIG. 8 is a perspective view showing an operating state of hooks and bosses of the latch device according to the present embodiment.

FIG. 9 is a perspective view showing an operating state of hooks and bosses of the latch device according to the present embodiment.

FIG. 10 is a perspective view showing an operating state of hooks and bosses of the latch device according to the present embodiment.

FIG. 11 is a sectional view showing the structure of a conventional latch device.

[Explanation of symbols]

 30 Latch device 42 Housing 50 Shaft (mover) 54 Compression coil spring (biasing means) 56 Circulation guide groove 56G Angle groove (locking part) 58 Guide protrusion 62 Hook 64 Boss (projection)

Claims (1)

[Scope of utility model registration request] 1. A housing attached to the main body, and a mover reciprocally inserted into the housing.
Energizing means for urging the moving element in the extracting direction, guide protrusions provided in the housing, and pressing force formed along the outer periphery of the moving element and guided by the guide protrusions and acting on the moving element. A circulation guide groove for converting the rotation force of the moving element into a rotational force of the moving element; a locking portion that is recessed in the groove wall of the circulation guiding groove and that is locked or unlocked by the guide projection by the pushing operation of the moving element; A latch device, comprising: a pair of hooks that extend from the tip of the mover and that oppose a constricted portion of a protrusion that is provided on an opening / closing door attached to the main body by a rotating operation. .