JPH08232528A - Latch device for sliding door - Google Patents

Abstract

PURPOSE: To prevent the flexural deformation of the stopping projecting piece of a locking plate even when large load is applied in the direction that a catch bar is separated under a locked state. CONSTITUTION: A recessed section 8 for locking, with which a catch bar 20 is engaged, is formed at the lower end section of a locking plate 12 pivotally attached to a case 5, and an indentation 11 is formed at the right side edge section of a stopping projecting piece 10 on the right side of the recessed section 8 for locking. A controlling projection is shaped to the top face of the right end section of a latching lever 16 pivotally attached to the case 5. The controlling projection 15 of the latching lever 16 and the indentation 11 of the stopping projecting piece 10 are engaged so as to be mutually held under a locked state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch device for a sliding door such as a cargo container container of a cargo truck.

[0002]

2. Description of the Related Art In a conventional slide door latch device, when a slide door is closed, a receiving rod engages with a locking recess at the lower end of a lock plate to move the slide door laterally in the lateral direction. Has been arrested.

However, in this conventional device, since the lock plate is U-shaped, when a large load is applied in the direction of separating the receiving rod in the locked state, the stop protrusion of the locking plate pushed by the receiving rod is pushed. There is a risk of bending and deforming the locking recesses and losing the locking function.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a latch device for a slide door in which the stop protrusion of the lock plate is not bent and deformed even when a large load is applied in the direction of separating the receiving rod in the locked state. It is to be.

[0005]

A latch device for a sliding door or the like has a case 5 fixed to the sliding door 1 and a horizontally long opening opened in the middle of the right end face. The receiving groove 3 is provided in the middle of the right end portions of the front and rear side wall plates 4, 4.

The lock plate 12 is pivotally mounted between the upper ends of the front and rear side wall plates 4, 4 by a first horizontal pivot shaft 6 and is urged to rotate counterclockwise by a torsion spring 7. The lock plate 12 is provided at its lower end with a locking recess 8 that is drawn toward the first horizontal pivot 6, and a passive protrusion 9 that projects into the receiving groove 3 is continuous to the left side of the locking recess 8. The stop protrusion 10 is continuously formed on the right side of the locking recess 8. A recess 11 is provided on the right edge of the stop protrusion 10.

The latch lever 16 is pivotally mounted between the lower ends of the front and rear side wall plates 4, 4 by a second horizontal pivot shaft 13 and is urged to rotate counterclockwise by a torsion spring 14. On the upper surface side of the right end portion of the latch lever 16, there is provided a stop projection 15 which engages with the recess 11 of the lock plate 12 so as to be held in an embrace.

The release lever 18 is pivotally attached to the left side wall plate 17 at the lower left portion of the front and rear side wall plates 4, 4. The receiving rod 20 is fixed to the side surface of the fixed frame body 19, enters the receiving groove 3 of the case 5, and engages with the locking recess 8 of the lock plate 12.

[0009]

As shown in FIG. 1, when the sliding door 1 is in the open state, the lock plate 12 is in the standby position where the passive protrusion 9 projects into the receiving groove 3 at an angle of about 45 degrees, and the latch lever is held. The stop protrusion 15 of 16 is the passive protrusion 9 of the lock plate 12.
Is in contact with the lower surface of the tip of the.

As shown in FIG. 2, when the slide door 1 is pulled in the closing direction, the receiving bar 20 enters the receiving groove 3 of the case 5 from the right end opening and contacts the right side surface of the passive protrusion 9. When the gold rod 20 pushes the passive protrusion 9 to the left, the lock plate 12 rotates in the clockwise direction against the bias of the torsion spring 7. The stop projection 15 of the latch lever 16 is the lock plate 12.
Is in contact with the lower surface of the tip portion of the stop protrusion 10.

As shown in FIG. 3, when the slide door 1 is in the fully closed state, the locking projection 15 of the latch lever 16 is stopped.
Engages with the recess 11 of the lock plate 12. The receiving rod 20 is deeply engaged with the locking recess 8 through the inner surface of the passive protrusion 9.

In order for the receiving rod 20 to escape from the locking recess 8, the lock plate 12 must rotate counterclockwise, but the lock plate 12 rotates counterclockwise.
It is blocked by the engagement of the stop projection 15 of the latch lever 16 and the recess 11 of the lock plate 12.

In order to release the lock of the slide door 1 and open the slide door 1, the release lever 18 is pulled up, and the left end of the passive portion 21 of the latch lever 16 is pushed up. By this operation, the latch lever 1
6 is rotated in the clockwise direction against the urging force of the torsion spring 14, and the stop projection 15 of the latch lever 16 and the lock plate 1 are rotated.
The engagement with the two recesses 11 is released. At the moment when this releasing operation is performed, the lock plate 12 is rotated counterclockwise by the torsion spring 7.

[0014]

In the illustrated embodiment, the case 5 is a sliding door 1.
The first horizontal pivot 7 fixed to the horizontal shelf 2 of the case and penetrating the front and rear side wall plates 4 and 4 of the case 5 is prevented from being pulled out by the retaining rings fitted to the front and rear ends. Similarly, the second horizontal pivot 13 parallel to 6 is also prevented from being pulled out by the retaining ring.

A taper surface portion 22 is provided on the upper and lower inner surfaces of the right end portion of the receiving groove 3 provided in the case 5, and serves as a guiding means when the receiving rod 20 is inserted. Receiving rod 20 is U
It is composed of a metal rod bent into a letter shape, and the receiving rod 20
Each of the front and rear ends is fixed to a mounting board 23 by welding or the like, and the mounting board 23 is fixed to a fixed frame body 19 such as a cargo container container body by screws passing through the mounting holes 24. The mounting position of the receiving rod 20 is not limited to the intermediate portion of the fixed frame body 19, and may be the lower end portion of the fixed frame body 19.

The rotation biasing torsion spring 7 of the lock plate 12 is composed of a winding tightening spring having a coil portion fitted to the first horizontal pivot 6, and one end of the torsion spring 7 has a spring receiving portion provided on the front side wall plate 4. 25, and the other end of the torsion spring 7 is in contact with the right side surface 26 of the stop protrusion 10. The standby protrusion 27 located above the lock plate 12 contacts the upper wall surface of the case 5 to stop and hold the lock plate 12 at the standby position. The other end of the torsion spring 7 is engaged with the intersection of the standby protrusion 27 and the stop protrusion 10.

A torsion spring 1 for urging the rotation of the latch lever 16
4 is also a winding tightening spring in which the coil portion is fitted to the second horizontal pivot 13, and one end of the torsion spring 14 has a latch lever 16
And the other end of the torsion spring 14 abuts on a screw receiving portion 29 provided on the front side wall plate 4.

The recess 11 of the lock plate 12 and the latch lever 1
The respective restraining projections 15 of No. 6 are set in such a manner that they are engaged with each other in a hugging manner in a locked state. The spring receiving portion 25 and the lock plate 12 are located so as not to interfere with each other.

[0019]

As described above, according to the present invention, the lock plate 12
The stop protrusion 10 formed on the right side of the locking recess 8 is provided with a recess 11 on the right side edge thereof, and the stop protrusion 15 is provided on the upper surface side of the right end of the latch lever 16, and the lock plate 12 is locked in the locked state. Depression 11 and the stop projection 15 of the latch lever 16
Engage with each other so as to embrace each other, so that even if a large load is applied in the direction of separating the receiving rod 20 due to vibration of the vehicle body or the like, the stop protrusion 10 is bent and deformed, and the locking recess 8 is expanded. None, the locked state is firmly held.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a sliding door latch device according to an embodiment of the present invention, showing an unlocked state.

FIG. 2 is a vertical cross-sectional view showing a state in which the latch device for the sliding door is being locked.

FIG. 3 is a longitudinal sectional view of the sliding door latch device in a locked state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door 2 Horizontal shelf 3 Receiving groove 4 Front / rear side wall plate 5 Case 6 First horizontal pivot 7 Torsion spring 8 Recess 9 Passive protrusion 10 Side wall of receiving case 11 Recess 12 Lock plate 13 Second horizontal pivot 14 Torsion spring 15 Stop Protrusion 16 Latch lever 17 Left side wall plate 18 Release lever 19 Fixed frame body 20 Receiving rod 21 Passive portion 22 Tapered surface portion for guide of receiving rod 23 Mounting board 24 Mounting hole 25 Screw receiving portion 26 Right side surface of stop protrusion 27 Standby protrusion Child 28 Lower surface of latch lever 29 Screw receiver

Claims (1)

[Claims] 1. A case 5 fixed to a slide door 1 and provided with a horizontally long receiving groove 3 opened in the middle of the right end face in the middle of the right end portions of the front and rear side wall plates 4, 4; Is provided between the upper ends of the first horizontal pivot 6 and is urged counterclockwise by a torsion spring 7 to be provided at the lower end thereof with a locking recess 8 that is drawn toward the first horizontal pivot 6. The receiving groove 3
A passive protrusion 9 protruding inward is continuously formed on the left side of the locking recess 8, a stop protrusion 10 is continuously formed on the right side of the lock recess 8, and a recess is formed on the right edge of the stop protrusion 10. A lock plate 12 provided with 11; a second horizontal pivot shaft 13 pivotally mounted between the lower ends of the front and rear side wall plates 4, 4 and urged counterclockwise by a torsion spring 14 to form the recess of the lock plate 12. A locking lever 16 provided on the upper surface side of the right end portion with a stop projection 15 that engages so as to embrace 11; and a release lever 18 pivotally attached to a left side wall plate 17 at the lower left of the front and rear side wall plates 4, 4. Fixed to the side surface of the fixed frame body 19, the receiving groove 3 of the case 5
And a receiving bar 20 which is engaged with the locking recess 8 of the lock plate 12 and enters into the lock latch 12 for the sliding door.