JPH0144698Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a magnetic circuit interrupting device for Pushulatsch.

In particular, push latches with a magnet at the tip are widely used to allow lids, doors, etc. used in audio equipment cabinets to be opened and closed without the need for handholds.

This type of push latch is equipped with an operating rod that locks when pressed, and releases the lock when pressed further and returns to its original position. A magnet was attached to the tip, but in the former case, the magnetic circuit was not cut off when the operating body returned to its original position, so the piece to be attracted attached to a door, etc. remained slightly open while being attracted to the magnet. Furthermore, when opening a door, etc., there was a problem in that the door, etc. had to be pulled against this magnetic attraction to break the magnetic circuit.

Therefore, a magnet is attached to the case body side, and when the operating body returns to its original position, the magnetic circuit between this magnet and the piece to be attracted attached to the door etc. side is cut off.
A magnetic circuit breaker has been developed that pushes doors, etc. forward.

This structure worked well, but
Since the magnetic force is cut off at the initial stage of pushing out the operating rod, a problem arises in that doors and the like are sometimes pushed out forcefully.

This invention solves this problem by providing a magnetic circuit interrupting device configured to cut off the magnetic circuit at the end of the extrusion operation when the operating rod returns to its original position.

This invention will be explained in detail below based on an embodiment shown in the drawings. In FIGS. 1 to 3, the case body 1 is made of synthetic resin and has a cylindrical shape. It is stored in the storage hole 2b. The case body 1 has protrusions 1a protruding from the inside of its front end to prevent the operating rod 3 from rotating in the circumferential direction and to ensure accurate sliding in the axial direction. A serrated guide wall 4 is formed in the circumferential direction near the center of the inner circumferential surface of the case body 1, and long grooves 1b, 1 are formed from every other valley of the guide wall 4 to the front end.
b is dug, and an insertion groove (not shown) for fitting the case bottom cover 5 in a fixed position is also dug at the rear end of the inner circumferential surface. Lid 5
Holes 1c, 1c for fixing the case body 1 to the case body 1 are provided.

The case bottom cover 5 has a cylindrical shape, and a serrated guide wall 6 similar to the guide wall 4 of the case body 1 is formed at its front end. A convex portion (not shown) that is inserted into the insertion groove is provided on the outer peripheral surface of the diameter having a diameter large enough to fit into the hole 1c, 1.
Locking protrusions 5a, 5a that match c are provided. Further, the rear half of the case bottom cover 5 has a diameter that matches the outer diameter of the case body 1, and this rear end is closed to form the bottom, and the rear part further has a plurality of fixing protrusions on the outer periphery. An adjusting body 6 having protruding portions 6a, 6a is screwed onto the adjusting body 6 and is inserted into the inner wall of the storage hole 2a.

The operating rod 3 has a hollow cylindrical shape, and its outer diameter substantially matches the inner diameters of the case body 1 and the case bottom cover 5.
Inside the square hole provided in the central axial direction of the operating rod 3,
The magnet 7 and the attracting pieces 8, 8 made of a magnetic material sandwiching the magnet 7 from above and below are housed so as to be movable back and forth within a limited range, and the tail parts 8a, 8a of the attracting pieces 8, 8 are inserted.
are long grooves 3a, 3a that communicate with the square hole and fit the protrusions 1a, 1a provided on the case body 1 through guide holes 9, 9 led out to the outside of the operating rod 3;
It protrudes inward. Additionally, a flange 3 is provided on the circumferential surface to prevent the front end from fitting into the case body 1.
b is provided around the circumference, and square holes 10a, 10 are further provided outside thereof to expose the front parts of the suction pieces 8, 8.
A cover part 10 provided with a is fitted to prevent the magnet 7 from coming out. The rear end of the operating rod 3 has a smaller diameter than the front part to fit the rotating ring 11, and the rear part is made smaller in diameter and has a notch 3c to provide elasticity in the radial direction. Engagement pieces 3d, 3d are provided protrudingly on the circumferential surface, and the rotating wheel retainer 12 is fitted therein.

This rotary wheel presser 12 has a concave portion formed at its rear end, and a spring 13 is formed between the rotary ring presser 12 and the rear end of the operating rod 3.
It is designed to hold. Further, this recessed portion is provided with a notch 12a that engages with the engaging piece 3d.

Since this invention is constructed as described above, when the door 14 is closed, the tip of the operating rod 3 comes into contact with the attracted piece 15 provided on the door 14, and the operating rod 3 retreats toward the rear end. At this time, the rotating wheel 11 fitted to the operating rod 3 also moves backward together, but the rotating wheel 11
The protrusions 11a, 11a move back inside the long grooves 1b, 1b and come into contact with the guide wall 6 of the case bottom cover 5. Then, since the peaks of the guide walls 4 and 6 are misaligned, the rotary wheel 11 is rotated while sliding on the slope of the guide wall 6 and stopped at the valley. When you stop pushing the door 14, the operating rod 3 tries to return to its original position due to the elastic force of the spring 13, but the protrusions 11a, 11a of the rotary wheel 11 abut against the guide wall 4 of the case body, causing it to retreat. As before, it slides on the slope of the guide wall 4 and rotates until it is stopped at the trough. Since the long grooves 1b, 1b are not dug in this valley, the operating rod 3 is locked at that position. By the time this state is reached, the attracting pieces 8, 8, which have been magnetized by the magnet 7, use magnetic force to attract the attracted piece 15, which is a magnetic material that is in contact with the tip of the operating rod 3. Then, it slides toward the attracted piece 15, and its tip comes into contact with the attracted piece 15, so that they are magnetically attracted to each other. Therefore, since a magnetic circuit is formed from the magnet 7 to the attracted piece 15, the closed state of the door is maintained by this magnetic attraction.

To open the door 14, push the door 14 again, the operating rod 3 will move back, and the protrusion 11 of the rotary wheel 11 will move back.
a and 11a go from the guide wall 4 of the case body 1 to the guide wall 6 of the case bottom cover 5, slide on the slope of the guide wall 6, and are stopped at the valley. At this time, door 14
When the user stops pressing , the protrusions 11a, 11a of the rotary wheel 11 move toward the guide wall 4 of the case body 1 again due to the elastic force of the spring 13, and slide along the slope to reach the valley. have long grooves 1b, 1b
are dug, so the protrusions 11a, 1 of the rotating wheel 11
1a will move forward in the long grooves 1b, 1b, and the operating rod 3 will move forward and push the door 14 to open it. This action is achieved by the grooves 3a, 3a provided on the operating rod 3 and the protrusion 1 provided on the case body 1.
a, 1a allows the operating rod 3 to accurately slide in its axial direction and prevent it from rotating in its circumferential direction, and allows the rotary ring 11 to rotate freely in its circumferential direction on the operating rod 3. This can be done easily since they are fitted. In this way, just before the operating rod 3 moves forward and returns to its original position, both the long grooves 3
The tails 8 of the suction pieces 8, 8 that were moving a, 3a
a, 8a collide with protrusions 1a, 1a provided on the case body 1 which are fitted into the long grooves 3a, 3a. However, since the suction pieces 8, 8 are movable in the longitudinal direction, the actuating rod 3, pushed by the elastic force of the compression coil spring 13, still tries to move forward, and the force is finally applied to the suction pieces 8, 8. Since the magnetic attraction force between the actuating rod 3 and the adsorbing piece 15 is overcome, the magnetic circuit between the actuating rod 3 and the adsorbing piece 15 is interrupted. In this way, the door 14 is once pushed out forcefully by the operating rod 3, then stopped, and then pushed open a little further while the magnetic circuit is cut off. It opens smoothly without being pushed forward forcefully.

As explained in detail above, according to this invention, the magnetic circuit is mechanically interrupted near the end of the pushing operation of the operating rod toward the door, etc., so the door, etc. is pushed forcefully due to the braking action at the time of this interruption. This can provide the effect of being able to prevent being pushed out.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; FIG. 1 is a perspective view of a cabinet in which this invention is implemented, and FIGS. 2 and 3 are side sectional views of this invention. 1...Case body, 1a, 1a...Protrusion, 3...
... Operating rod, 3a, 3a... Long groove, 7... Magnet,
8, 8... Adsorption piece, 8b, 8b... Bottom, 9, 9
...Guide hole.

Claims (1)

[Scope of utility model registration request] In a push latch equipped with an operating lever that locks when pressed into the case body, and releases the lock and returns to its original position when pressed further, a magnet is housed inside one side of the operating lever, and the magnet Adhesive pieces made of a magnetic material are attached to both sides of the attracting piece so that these adhering pieces can move within a limited range in the longitudinal direction, and the ends of each of the adsorbing pieces are further bent to form a tail part. , a protrusion is provided on the case body side to engage with the tail portion and lock the suction piece near the end of the forward movement of the actuating body, so that when the actuating rod is locked by the first push; The magnetism is characterized in that the tip of each suction piece protrudes from the tip of the actuating rod, and when the actuating rod returns to its original position with the next press, the tip of each suction piece is retracted from the tip of the actuating rod. circuit breaker.