JPH0736039Y2 - Latch device for push-button operated doors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a push-button actuating door latch device used for a door of an electrical equipment housing box or the like.

[Prior Art] In a conventional push-button actuating door latch device disclosed in Japanese Utility Model Laid-Open No. 63-174280, an operation lever is housed in a front side recess of a case embedded in a door, and a side wall plate of the case is provided. The operation lever pivotally attached to the portion by a transverse pivot is exposed in the opening of the front plate of the case, and the linearly sliding latch body is accommodated in the guide groove between the back plate of the case and the intermediate partition plate. An operating lever in which a spring inserted between the case and the latch body urges the latch body to slide in a direction in which the latch body is engaged with the receiving member on the fixed frame body side so as to project from the window hole of the intermediate partition plate into the guide groove portion. The front end of the latch is in contact with the intermediate passive portion of the latch body.

However, in this conventional device, it is necessary to insert a fingertip from the opening of the front plate portion of the case and push the operation lever deeply, and to overcome the large sliding resistance of the latch body and the receiving metal which are in close contact with each other. , The operability when unlocking is not good because the operating lever needs to be pressed strongly.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a push-button actuated door latch device that can perform an unlocking operation lightly and accurately by simply pushing the push button shallowly with a relatively small force. Is.

[Means for Solving the Problems] The following will describe with reference numerals in the accompanying drawings. In the push-button actuating door latch device of the present invention, the bearing is provided on the back side of the fixed handle 2 fixed to the door 1. The plate 3 is fixed, and the rotary latch plate 5 is pivotally attached to the bearing plate 3 by the transverse pivot 4.
The stop pin 6 is attached to the bearing plate 3 at a position obliquely rearward of the pivot 4.
Then, the middle portion of the L-shaped lock lever 7 is pivotally attached to the bearing plate 3 by the transverse pivot 8 at a portion obliquely forward of the pivot 4.

Notch 11 with which the latch 10 of the fixed frame body 9 is engaged with and disengaged from the rotary latch plate 5.
Is provided in the radial direction from the peripheral surface, and the front edge surface 11a of the notch 11 is formed longer than the rear edge surface 11b. A locking projection 13 for engaging the locking plate portion 12 of the lock lever 7 when the cutout 11 and the receiving plate 10 are engaged is provided on the peripheral edge of the rotary latch plate 5 at a site opposite to the cutout 11. , A rotation stop projection with which the stop pin 6 engages when the notch 11 and the receiving plate 10 are separated
14 is provided on the peripheral edge of the rotary latch plate 5 at a portion between the notch 11 and the locking projection 13.

The spring 15 inserted between the bearing plate 3 and the rotary latch plate 5 urges the rotary latch plate 5 to rotate in the direction in which the notch 11 and the receiving plate 10 are separated, and is inserted between the lock lever 7 and the bearing plate 3. The spring 16 urges the lock lever 7 to rotate in the direction in which the locking plate 12 and the locking projection 13 are engaged with each other.

A push button 18 which is biased by a spring 23 is housed in a front concave portion 17 of the fixed handle 2, a guide through hole 19 is provided on the bottom surface of the concave portion 17, and a rear side operation of the push button 18 is provided in the guide through hole 19. The rod 20 is inserted, and the passive plate portion 22 of the lock lever 7 formed symmetrically with the locking plate portion 12 with respect to the pivot 8 is brought into contact with the rear end portion 21 of the operation rod 20.

[Operation] When the door 1 is closed and locked as shown in FIG.
The rotary latch plate 5 is rotated to a position where the notch 11 is directed obliquely forward, and the catch 10 is deeply engaged with the notch 11. The push button 18 is returned to the front end position by the bias of the compression coil spring 23. In the lock lever 7, the passive plate portion 21 abuts on the tip end portion 21 of the operation rod 20 of the push button 18, while the locking plate portion 12 is engaged with the locking projection 13 of the rotary latch plate 5.

The engagement state of the notch 11 and the receiving plate 10 is the engagement plate portion 12 and the engagement protrusion.
It is held by the engagement of 13, and the engagement state of the locking plate portion 12 and the locking projection 13 is held by the urging force of the spring 16, whereby the door 1 is locked to the fixed frame body 9. There is.

In order to unlock and release the door, the push button 18 may be pushed in the recess 17 of the fixed handle 2 against the bias of the spring 23. By this pushing, the rear end 21 of the operating rod 20
Pushes the front side of the passive plate portion 22 of the lock lever 7, the lock lever 7 rotates against the bias of the spring 16, and the locking plate portion
12 is disengaged from the locking projection 13 of the rotary latch plate 5.

In this way, since the lock lever 7 releases the constraint of the rotary latch plate 5, the rotary latch plate 5 is rotated by the biasing force of the spring 15, and the front edge 11a of the notch 11 pushes the receiving plate 10. Due to this reaction, the door 1 is biased in the opening direction. Along with the rotation of the rotary latch plate 5, the front edge surface 11a of the receiving plate 10 and the notch 11 is formed.
The contact point with and moves to the tip side.

As shown in FIG. 4, when the rotary latch plate 5 is rotated to a position where the notch 11 is directed obliquely rearward, the engagement between the notch 11 and the receiving plate 10 is released, and the lock 1 of the door 1 is locked to the fixed frame body 9. Stop is completely released. The door 1 is opened to a required angle by pulling the fixed handle 2 toward you. In the opened state of the door 1, the rotation latch plate 5 is held at the waiting position facing diagonally rearward by the engagement of the rotation stop projection 14 and the stop pin 6.

When the door 1 is closed, the tip 10 of the front edge surface 11a of the notch 11 is pushed by the receiver 10, so that the rotary latch plate 5 rotates against the bias of the spring 15. With this rotation, the receiving plate 10 deeply engages with the notch 11. As the rotation latch plate 5 rotates, the locking plate portion 12 of the lock lever 7 slides on the outer peripheral surface of the rotation latch plate 5, and at the stage where the catch 10 is deeply engaged with the notch 11, the locking plate portion 12 Rides over the locking projection 13 and engages with the wall surface on the opposite side of the locking projection 13. As a result, the door 1 is locked again with respect to the fixed frame body 9.

[Embodiment] In the illustrated embodiment, the metal block 24 provided with the recess 17 for accommodating the push button 18 is insert-molded into the plastic fixed handle 2. The guide through hole 19 into which the operating rod 20 is inserted is formed as a stepped hole, and the receiving hole 27 is formed in parallel with the guide through hole 19.
Are provided in block 24. The operating rod 20 is a push button 18
The finger resting plate portion 25 is integrally molded with a large-diameter rear end portion 21 made of wear-resistant plastic and screwed and fixed to the operation rod body. The front end edge surface 21a of the rear end portion 21 abuts on the intermediate step surface 19a of the guide through hole 19 to prevent the push button 18 from falling off forward.

A spring receiving rod 26 on the back surface of the lower end portion of the push button 18 is fitted into the receiving hole 27. The return biasing spring 23 is composed of a compression coil spring, and is compressed by the spring receiving rod 26 when the push button 18 is pushed in. Vertically long guide grooves 28, 28 are provided in parallel at the front end portions of the left and right inner side surfaces of the push button housing recessed portion 17. Left and right ends of a lid plate 29 are slidably fitted in the guide grooves 28, 28. When the lid plate 29 comes off, a regulation projection 30 provided on the rear surface of the lid plate 29 has an upper end surface of a concave portion 17. It is blocked by abutting 17a.

The locking small ball 33 housed in the small hole 34 of the block 24 is biased by the compression coil spring 35 so as to project. The small sphere 33 holds the cover plate 29 in the closed position by engaging with the conical recess 31 at the upper rear face of the cover plate 29, while engaging with the conical recess 32 at the lower rear face of the cover plate 29. By doing so, the lid plate 29 is held in the open position.

The bearing plate 3, which is formed by pressing a metal plate into a U-shape in a vertical section, is fitted to a protruding portion on the back surface side of the block 24 and fixed by screws 36. The biasing spring 15 of the rotary latch plate 5 is composed of a torsion spring whose coil portion is fitted to the transverse pivot 4, and one straight end portion 15a is engaged with the locking projection 13 and the other straight end portion is engaged. 15b is inserted and locked in the through hole 37 of the bearing plate 3.

The biasing spring 16 of the lock lever 7 is composed of a tension coil spring, and one end 16a is hooked on the bearing plate 3 and the other end 16b is hooked on the through hole 39 of the intermediate plate 38 of the lock lever 7. The transverse pivot 8 is inserted through the intermediate plate portion 38. The fixed handle 2 is fastened and fixed to the door 1 with screws 40 from the back side of the door 1. Receipt made by bending a metal rod into a U shape
The substrate 41 is fixed to the fixed frame 9 by welding.

[Advantage of the Invention] As described above, in the push-button actuating door latch device of the present invention, the rotary latch plate 5 is pivotally attached to the bearing plate 3 fixed to the rear side of the fixed handle 2 by the transverse pivot shaft 4, and 4, a stop pin 6 is fixed at a position obliquely rearward of the pivot 4, and an intermediate portion of a lock lever 7 is pivotally mounted at a position obliquely frontward of the pivot 4 by a transverse pivot 8 so that the rotary latch plate 5 receives the fixed frame 9. The lock lever 7 is provided with a notch 11 that engages and disengages with the gold 10 in the radial direction.
A locking projection 13 with which the locking plate portion 12 of the above is engaged is provided at a site opposite to the cutout 11, and a rotation stop projection 14 with which the stop pin 6 is engaged is provided between the cutout 11 and the locking projection 13. Provided at the part of, spring 15
Urges the rotary latch plate 5 to rotate in the direction in which the notch 11 and the receiving plate 10 separate, and the spring 16 urges the lock lever 7 to rotate in the direction in which the locking plate 12 and the locking projection 13 engage. ,
The push button 18 is accommodated in the front concave portion 17 of the fixed handle 2, and the operation rod 20 on the rear side of the push button 18 is provided in the guide through hole 19 on the bottom surface of the concave portion.
The lock lever 7, and the passive plate portion 22 of the lock lever 7 is inserted into the operating rod.
The lock lever 7 is brought into contact with the rear end portion 21 of the lock lever 20, and the interlocking of the lock lever 7 formed in an L shape allows the push button 18 to be pushed shallowly with a comparatively small force, so that the unlocking operation can be performed lightly and accurately. You can do it.

[Brief description of drawings]

FIG. 1 is a front view of a push-button actuating door latch device according to an embodiment of the present invention, and FIG. 2 is a left side view of the door latch device. FIG. 3 is a longitudinal sectional view of the door latch device in a door locked state, and FIG. 4 is a longitudinal sectional view of the door latch device in an unlocked state. 1 ... Door, 2 ... Fixed handle, 3 ... Bearing plate, 4 ...
Axis, 5 ... Rotating latch plate, 6 ... Stop pin, 7 ... Lock lever, 8 ... Axis, 9 ... Fixed frame, 10 ... Receiving, 11 ... Notch, 12 ... Locking plate Part, 13 ... locking protrusion, 14
…… Anti-rotation protrusion, 15 …… Biasing spring, 16 …… Biasing spring, 17 …… Recess, 18 …… Push button, 19 …… Guide through hole, 20
…… Control rod, 21 …… Rear end, 22 …… Passive plate, 23 …… Return spring, 24 …… Block, 25 …… Finger contact plate, 26 ……
Spring support rod

Claims (1)

[Scope of utility model registration request] 1. A bearing plate 3 is fixed to the back side of a fixed handle 2 which is fixed to a door 1, and a rotary latch plate 5 is pivotally attached to the bearing plate 3 by a transverse pivot shaft 4 and obliquely rearward of the pivot shaft 4. The stop pin 6 is fixed to the bearing plate 3 at the position of, and the intermediate portion of the L-shaped lock lever 7 is pivotally attached to the bearing plate 3 by the transverse pivot 8 at a position diagonally forward of the pivot 4. The plate 5 is provided with a notch 11 for engaging and disengaging the receiving member 10 of the fixed frame body 9 in the radial direction from the peripheral surface, and the front edge surface 11a of the notch 11 is formed longer than the rear edge surface 11b. A locking projection 13 with which the locking plate portion 12 of the lock lever 7 is engaged in the engaged state of the money receiver 10 is provided on the peripheral edge of the rotary latch plate 5 at a site opposite to the cutout 11. The rotation stop projection 14 that engages with the stop pin 6 when the 11 and the receiving plate 10 are separated is rotated at a position between the notch 11 and the locking projection 13. A spring 15 provided on the peripheral edge of the latch plate 5 and inserted between the bearing plate 3 and the rotary latch plate 5 urges the rotary latch plate 5 to rotate in the direction in which the notch 11 and the receiving plate 10 are disengaged, and the lock lever The lock lever 7 by means of a spring 16 inserted between the bearing plate 3 and the bearing plate 3
The push button 18 is urged to rotate in a direction in which the locking protrusion 13 and the locking protrusion 13 are engaged with each other and is urged to return to the front recess 17 of the fixed handle 2 by the spring 23.
A guide through hole 19 is provided in the bottom surface of the recess 17, and the operation rod 20 on the back side of the push button 18 is inserted into the guide through hole 19 so as to be symmetrical with the locking plate portion 12 with respect to the pivot 8. A push-button actuating door latch device in which the passive plate portion 22 of the formed lock lever 7 is brought into contact with the rear end portion 21 of the operating rod 20.