JPH08246736A - Latch device for sliding door - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a latch device for a sliding door in which a stop protrusion of a lock plate is not bent and deformed and a locking function is not lost due to a resonance phenomenon of a spring. A locking recess 8 with which a receiving rod 20 is engaged is provided at a lower end portion of a lock plate 12 pivotally attached to a case 5, and a recess is formed in a right edge portion of a stop protrusion 10 on the right side of the locking recess 8. 11 is provided, and a stop projection is provided on the upper surface of the right end portion of the latch lever 16 pivotally attached to the case 5, so that the latch lever 16 is locked in the locked state.
The locking projection 15 and the recess 11 of the stop projection 10 are engaged with each other so as to embrace each other, and the release lever 18 is fixed to the case 5.
The lock lever 34 is pivotally attached to the case 5 by the fixed pivot 31 passing through the escape slot 37 of the release bar 40, and the interlocking protrusion 33 of the lock lever 34 is inserted into the interlocking slot 38 of the release bar 40. Release bar 4 with holding spring 36
0 is pulled to engage the movable pin 43 of the release lever 18 with the stop recess 45 of the release bar 40, and the operation portion 35 pivotally attached to the lock lever 34 is pulled to engage the release protrusion 39 of the unlock bar 40. The stop lever 16 is disengaged from the passive end.

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. When used in an environment with severe vibration due to bending deformation and expansion of the locking recess, when the natural frequency of the posture-holding spring matches the external vibration frequency, the resonance phenomenon causes the spring to expand and contract accidentally. By doing so, there is a risk that the latch bar will rotate in the unlocking direction and lose the locking function.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent the stop protrusion of the lock plate from bending and deforming even when a large load is applied in the direction in which the receiving rod is pulled apart in the locked state, and is used in a vibrating environment. It is an object of the present invention to provide a latch device for a sliding door that does not lose the locking function due to the resonance phenomenon of the spring even if it is operated.

[0005]

In the following, with reference to the reference numerals in the accompanying drawings, in the sliding door latch device of the present invention, the case 5 is fixed to the sliding door 1 and opened in the middle of the right end face. A horizontally long 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 of the latch lever 16, there is provided a stop projection 15 that engages with the recess 11 of the lock plate 12.

The lock lever 34 is the left side wall plate 1 of the case 5.
A fixed pivot 31 is pivotally attached to the upper part of the device 7, is urged to rotate counterclockwise by a return spring 32, and an interlocking protrusion 33 is provided at the lower end. Lock lever operation part 35
Is pivotally attached to the upper end of the lock lever 34 by a movable pivot 30.

The release bar 40 has an escape slot 37 at the upper end.
Is fixed to the left side wall plate 17 of the case 5 in the vicinity of an intermediate portion thereof, and is urged to rotate in a counterclockwise direction by a posture holding spring 36. A release projection 39 projecting toward the latch lever 16 is provided in the portion, and a blocking recess 45 is continuously formed below the release projection 39. The release lever 18 is pivotally attached to a lower portion of the left side wall plate 17 by a fixed pivot 42, and a movable pin 43 protruding toward the release bar 40 is fixed to a lower end portion thereof.

The release lever operating portion 44 is pivotally attached to the upper end of the release lever 18 by a movable pivot shaft 41. The receiving rod 20 is fixed to the side surface portion of the fixed frame body 19, enters the receiving groove 3 of the case 5, and enters the locking recess 8 of the lock plate 12.
Engage with.

[0011]

When the slide door 1 is in the fully closed state, the stopper projection 15 of the latch lever 16 causes the depression 11 of the lock plate 12 to move.
Engage with. The receiving rod 20 deeply engages with the locking recess 8 via the inner surface of the passive protrusion 9, and as shown in FIG. 2, the locking recess 45 of the release bar 40 and the movable pin 43 of the release lever 18 are engaged.
Are engaged. As shown in FIG. 3, the lock lever 3
Since the interlocking protrusion 33 of 4 is urged to move slightly to the front,
Even if the operating portion 44 of the release lever is pulled and the release bar 40 is pressed upward by the movable pin 43 of the release lever 18, the release protrusion 39 does not engage with the left end portion of the passive portion 21 of the latch lever 16, and the idle swing Resulting in.

In order for the receiving rod 20 to escape from the locking recess 8, the lock plate 12 rotates counterclockwise and the operating portion 35 of the lock lever moves and urges toward the rear side wall plate 4,
The operation portion 44 of the release lever must be moved and biased toward the front side, but the rotation of the lock plate 12 in the counterclockwise direction causes the engagement between the stop projection 15 of the latch lever 16 and the recess 11 of the lock plate 12. The lock lever operating portion 35 is blocked by the rotational force of the return spring 32,
The operating portion 44 of the release lever is blocked by a drive spring provided in the operating means 47 of the release lever.

To unlock and lock the slide door 1 and open the slide door 1, the operating portion 35 of the lock lever is pulled to the front side, and the movable pin 43 of the release lever 18 and the recess for stopping the release bar 40 are depressed. 45, the operation portion 44 of the release lever is pulled to the front side, and the movable pin 43 of the release lever 18 is pulled up.
Push up the left end of the passive part 21 of 6. By this operation, the latch lever 16 is rotated in the clockwise direction against the bias of the torsion spring 14, and the engagement between the restraining projection 15 of the latch lever 16 and the recess 11 of the lock plate 12 is released.
At the moment when this releasing operation is performed, the lock plate 12 is rotated counterclockwise by the bias of the torsion spring 7.

When the slide door 1 comes to the open state,
The lock plate 12 is at the standby position where the passive protrusion 9 projects into the receiving groove 3 at an angle of about 45 degrees, and the stop protrusion 15 of the latch lever 16 contacts the lower surface of the tip of the passive protrusion 9 of the lock plate 12. And the lock lever operating part 3 as shown in FIG.
5 is pulled toward the front, the lock lever 34 is located on the front side against the bias of the return spring 32, and the lower surface of the release bar 40 and the movable pin 43 of the release lever 18 are in contact with each other.

When the slide door 1 is pulled in the closing direction, the receiving rod 20 enters the receiving groove 3 of the case 5 from the right end opening, and the receiving rod 20 abutting on the right side surface of the passive protrusion 9 has the passive protrusion 9. By pushing to the left, the lock plate 12 rotates in the clockwise direction against the bias of the torsion spring 7. Latch lever 1
The stop projection 15 of 6 is in contact with the lower surface of the tip of the stop projection 10 of the lock plate 12.

[0016]

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.

Further, a tapered 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 biasing 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.

The lock lever 34 is bent in an L shape when the upper movable pivot 41 is pivotally attached, and is bent at 150 degrees when the central fixed pivot 31 is pivotally attached. The return spring 32 of the lock lever 34 is a torsion spring, one end of which is fitted to the upper portion of the lock lever 34 and the other end of which is fitted to the left side wall plate.

The interlocking protrusion 33 provided on the lower portion of the lock lever 34 is engaged with the upper portion of the interlocking slot 38 in the middle portion of the release bar 40. Spring 3 for holding the posture of the release bar 40
Reference numeral 6 denotes a tension coil spring, one end of which engages with a spring receiving portion 48 provided at the lower end of the interlocking slot 38, and the other end of which engages with a spring receiving portion 49 provided on the lower surface of the case 5. There is.

The lock lever operating portion 35 is connected to an external operating means 46. The release lever operating section 44 is connected to an external operating means 47.

[0024]

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.

The unlocking operation mechanism is composed of the lock lever 34, the release lever 18 and the release bar 40, and the release lever 1 is inserted into the locking recess 45 of the release bar 40 when locked.
By engaging the movable pin 43 of No. 8 to hold the release projection 39 of the release bar 40 in a position not engaged with the passive end portion of the latch lever 16, it can be used in a vibrating environment. The holding spring 36 accidentally expands and contracts due to the resonance phenomenon, so that even if the release bar 40 rotates in the unlocking direction, the release projection 39 is deflated and the locked state is firmly held.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional left side view showing a locked state of the sliding door latch device.

FIG. 3 is a vertical cross-sectional left side view showing an unlocked state of the sliding door latch device.

FIG. 4 is an exploded perspective view of a lock lever, a release lever and a release bar incorporated in the sliding door latch device.

[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 Guide taper surface portion of receiving rod 23 Mounting board 24 Mounting hole 25 Spring receiving portion 26 Right side surface of stop protrusion 27 Standby protrusion Child 28 Lower surface of latch lever 29 Screw receiving portion 30 Movable pivot 31 Fixed pivot 32 Return spring 33 Interlocking protrusion 34 Lock lever 35 Lock lever operating portion 36 Posture holding spring 37 Escape slot 38 Interlocking slot 39 Release protrusion 40 Release Bar 41 Movable pivot 42 Fixed pivot 43 Movable pin 44 Release lever operation part 45 Stop recess 46 Lock lever operating means 47 Release lever operating means 48 Spring receiving portion 49 Spring receiving portion

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. 11. A latching lever 16 provided with a stop projection 15 engaging with 11 on the upper surface side of the right end; a lock lever 16 which is pivotally attached to the upper part of the left side wall plate 17 of the case 5 by a fixed pivot 31 and counterclockwise by a return spring 32. A lock lever 34 which is urged to rotate and provided with an interlocking protrusion 33 at the lower end; and a lock lever operating part 35 pivotally attached to the upper end of the lock lever 34 by a movable pivot 30.
And; is fixed to the upper part of the left side wall plate 17 by a fixed pivot 31 passing through the escape slot 37 at the upper end, and is used to hold the posture maintaining spring 3
6 is urged to rotate counterclockwise by 6, and an interlocking slot 38 is provided in the vicinity of the intermediate portion, and a release protrusion 39 protruding toward the latch lever 16 is provided at the lower end portion.
Release bar 40 having a recess 45 formed continuously on the lower side thereof
A releasing lever 18 pivotally attached to the lower part of the left side wall plate 17 of the case 5 by a fixed pivot 42, and a movable pin 43 protruding toward the releasing bar 40 fixed to the lower end thereof; A release lever operation portion 44 pivotally attached to the upper end of the lock frame; fixed to the side surface of the fixed frame body 19 and inserted into the receiving groove 3 of the case 5 to engage with the locking recess 8 of the lock plate 12. A latching device for a sliding door, which is formed of a mating receiving rod 20.