JP4148495B2 - Push button switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lock-type pushbutton switch mainly used for emergency stop.
[0002]
[Prior art]
This type of pushbutton switch is generally composed of an operation unit having a pushbutton that can be pushed and a contact unit connected to the operation unit. In an emergency, the contact of the contact unit is switched by the pushbutton operation. At the same time, the push button is locked in the pushed-in state, and there are a turn reset method for twisting the push button and a pull reset method for pulling the push button as unlocking operations of the locked push button. However, such a pushbutton switch, when the pushbutton is accidentally touched or clothing is caught, the pushbutton moves unintentionally, the lock is released, the contact is switched, and the device is in its original state. There was a possibility that the dangerous situation would recur. Therefore, conventionally, as shown in FIG. 13, a guard ring 3 is provided around the push button switch 2 attached to the panel 1 to prevent erroneous contact with the push button 4.
[0003]
[Problems to be solved by the invention]
However, since the pushbutton switch 2 performs the unlocking operation by twisting or pulling the pushbutton 4, if the pushbutton 4 is covered with the guard ring 3, the operability of unlocking is lowered. Further, it is difficult to press the push button 4 in an emergency in an emergency, and there is a possibility that the operation is not in time and a serious accident occurs. Furthermore, the addition of the guard ring 3 increases the mounting pitch on the panel 1 and increases the cost.
[0004]
Therefore, an object of the present invention is to prevent unlocking due to erroneous contact of a pushbutton switch without providing accessory parts such as a guard ring.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention comprises an operation unit having a push button that can be pushed and a contact unit connected to the operation unit, and the contact of the contact unit is brought about by a push operation of the push button. In addition to being switched, the operation portion is provided so as to freely enter and exit in a direction perpendicular to the push operation direction of the push button, and a lock pin that is spring-biased in a protruding direction, and the push button of the push button so as to intersect the lock pin An arc-shaped lock flange provided over the twisting range and formed with an engagement surface that engages with the lock pin; and an elastic member that applies a return force to the push operation and the twist operation of the push button. When the push button is pushed from the unlocked state, the lock pin engages with the lock flange and is locked in the pushed state. Wherein the click state pushbutton is twisting operation and then the tensile When operated, the push button switch having a locking mechanism engaging said locking pins are locked in the push button is released out,
The elastic member is a torsion coil spring, the engagement surface of the lock flange is inclined with respect to the orthogonal surface on one end side orthogonal to the center axis of the push button , and the tensile force of the push button. An inclined surface on the other end side that is inclined along the direction, and when the push button is pushed from the unlocked state, the lock pin passes over the lock flange and engages with the orthogonal surface to engage the push button. button is locked in the pushed-state, the push button from the locked state is twisting operation, then when it is pulling operation, it passes over the locking flange on the contrary the lock pin slides the inclined surface of the locking flange, The push button is unlocked (Claim 1).
According to the first aspect, since the unlocking requires a plurality of operations of the push button, the push button is not easily unlocked even if there is an erroneous contact.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, based on FIGS. 1-12, embodiment of this invention about the pushbutton switch unlock | released by the combination of two pushbutton operation of twist operation and tension | pulling operation is described. First, FIG. 1 is a perspective view showing an appearance of a pushbutton switch 2 attached to the panel 1, FIG. 2 is an exploded perspective view of a main part of the pushbutton switch 2, FIG. 3 is a plan view of the pushbutton switch 1, and FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. 1 to FIG. 1, a rotary cylinder 5 is inserted into a push button 4 from the back side, and a glove 6 is screwed from the front to a screw portion 5 a of the head and integrally coupled. A torsion coil spring 7 is fitted into the rotating cylinder 5 coupled to the push button 4, and the rotating cylinder 5 is inserted into the cylindrical portion 8 a of the frame 8 together with the torsion coil spring 7 so as to be able to rotate and move back and forth. .
[0007]
The torsion coil spring 7 is an elastic member that applies a restoring force to the pressing operation and the twisting operation of the push button 4, and hooks 7 a are formed at both ends thereof. Here, FIG. 5 is a side view of the rotating cylinder 5, FIG. 6 is a longitudinal sectional view of the frame 8, and as shown in FIGS. A locking recess 8b is provided inside. Therefore, the hooks 7 a at both ends of the torsion coil spring 7 are respectively engaged with the locking hole 5 b and the locking recess 8 b, and the rotary cylinder 5 is connected to the frame 8 through the torsion coil spring 7. The push rod 9 has an engaging claw 9b at the head of the cylindrical portion 9a, and the push rod 9 in which a back spring 10 made of a compression coil spring is fitted into the cylindrical portion 9a is inserted into the cylindrical portion 8a of the frame 8 from the back side. While engaging with the rotating cylinder 5 via the engaging claw 9 b, the protrusions 9 c at two places on the outer periphery are slidably fitted into the slits 5 c of the rotating cylinder 5. In this state, the lower flange 9d integrated with the cylindrical portion 9a abuts against the inner surface of the box-shaped housing 8c integrated with the cylindrical portion 8a of the frame 8. The push button 4 and the push rod 9 are integrally twisted via the rotating cylinder 5, but the twisting range (60 degrees in this case) is restricted between the push rod 9 and a stopper (not shown) of the frame 8. Yes.
[0008]
The lower flange 9d of the push rod 9 is provided with a pair of left and right square projections 9e, and a hole 9f is provided in the projection 9e in a direction perpendicular to the push operation direction of the push button 4 (downward direction in FIG. 4). Yes. A lock pin 11 as a lock member is inserted into the hole 9f together with the compression coil spring 12 so as to freely enter and exit. The lock pin 11 is urged by the compression coil spring 12 in the protruding direction. A pair of left and right U-shaped lock plates 13 are accommodated in the housing 8c of the frame 8 in which the push rod 9 is inserted, and the lock plate 13 has claws 13a projecting on both sides on the side wall of the housing 8c. Engaged and fixed. The back surface opening of the housing 8c is closed by the base 14 (FIG. 4). The cylindrical portion 14a of the base 14 accommodates an LED (not shown) for illumination, and the push button 4 is illuminated through the globe 6 by this LED. A contact unit 15 is connected to the frame 8. The contact unit 15 is fixed by engaging three claws 15a on the side surface of the housing 8c. In this state, the operation bar 15b faces the lower flange 9d of the push bar 9.
[0009]
The lock plate 13 is provided with an arcuate lock flange 13b as an engaging member. The lock flange 13b is provided over the twisting range of the push button 4 so as to intersect the lock pin 11, and is opposite to the surface (upper surface in FIG. 4) facing the lock pin 11 in the unlocked state of FIG. An engaging surface that engages with the lock pin 11 is formed on the surface (the same lower surface). 7 is a bottom view of the lock plate 13, FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7, and FIG. 9 is a cross-sectional view taken along line IX-IX. 7, the lock pin 11 is in the position (1) in the locked state, and is in the position (2) when the push button 4 is twisted by a predetermined angle (60 degrees in this case) in the direction of the arrow in FIG.
[0010]
As shown in FIGS. 8 and 9, the engagement surface (lower surface) of the lock flange 13 b includes an orthogonal surface A orthogonal to the central axis of the push button 4 and an inclined surface B inclined with respect to the orthogonal surface A. 7, the orthogonal plane A is formed in the range a from the upper end of FIG. 7 of the lock flange 13b to the position before the position (2) in FIG. 7, and the inclined plane B is the range from the end of the orthogonal plane A to the lower end of FIG. In b, the inclination angle gradually increases while continuing to the orthogonal plane A. The increase in the inclination angle is completed immediately before the position (2), and thereafter, the inclination angle remains constant at the angle shown in FIG. The upper surface of the lock flange 13b is formed on the inclined surface C over the entire length, and the inclination angle is larger than that of the inclined surface B so that the lock pin 11 described later can easily slide. In this push button switch 2, with the globe 6 loosened and the push button 4 removed, the cylindrical portion 8 a of the frame 8 is inserted into the mounting hole of the panel 1 from the back, and the fastening ring 16 (FIG. 4) is screwed on the frame 8. Screw into the part 8d (FIG. 2) and fix. 17 (FIG. 4) is a packing for adjusting the panel thickness.
[0011]
10 to 12 are enlarged views of part P in FIG. 4, FIG. 10 is an unlocked state (reset state), FIG. 11 is a state where the push button 4 is pushed down from the state of FIG. 10, and FIG. The state where the push button 4 is twisted is shown. When the push button 4 is pushed from the state of FIG. 4, the rotary cylinder 5 moves forward while compressing the torsion coil spring 7 and the back spring 10, and eventually comes into contact with the push rod 9. When the push button 4 is further pushed in, the push rod 9 also moves forward together, and the lock pin 11 gets over the lock flange 13b while sliding back on the inclined surface C on the upper surface of the lock flange 13b. Further, the push button 4 stops against the end face of the frame 8. FIG. 11 shows a state in which the lock pin 11 has passed over the lock flange 13 b, and when the hand is released from the push button 4 in this state, the push button 4 and the push rod 9 are moved via the rotating cylinder 5 by the restoring force of the torsion coil spring 7. As a result, the lock pin 11 is engaged with the orthogonal surface A (FIG. 8) on the lower surface of the lock flange 13b. In this state, even if the push button 4 is pulled, the engagement between the lock pin 11 and the orthogonal plane A is strong and cannot be unlocked. Further, in this state, the contact unit 15 is pressed with the operation rod 15b, and the contact is switched.
[0012]
In order to unlock the push button 4, first, the push button 4 is twisted 60 degrees against the coil spring 7 in the direction of the arrow in FIG. 3. By this twisting, the lock pin 11 comes to face the inclined surface B of the lock flange 13b. FIG. 12 shows this twisted state. Therefore, when the push button 4 is pulled up from the state shown in FIG. 12, the lock pin 11 slides back on the inclined surface B and climbs over the lock flange 13b from the bottom to the top. Therefore, if the hand is released from the push button 4, the push button 4 and the push bar 9 are turned by the restoring force of the torsion coil spring 7, and return to the unlocked state of FIG. Thereby, the contact of the contact unit 15 also returns to the state before the operation. On the other hand, if the hand is released from the push button 4 during the twisting of the push button 4 or in the state of FIG. 12, the state returns to the state of FIG. 11 while being locked by the restoring force of the torsion coil spring 7.
[0013]
As described above, the inclined surface B retracts the lock pin 11 when the push button 4 is pulled with a predetermined force, but the lock pin 11 cannot be retracted only by the spring force of the torsion coil spring 7. The push button 4 is held in a locked state. That is, the lock release is not performed only by twisting the push button 4 from the locked state. Therefore, even if the push button 4 is twisted due to erroneous contact, the lock release, that is, the switching of the contact is performed only by that. It will not be. In the illustrated embodiment, a lock pin is provided on the movable side (push bar side) and a lock flange is provided on the fixed side (frame side). However, it is also possible to provide them in the reverse relationship. .
[0014]
【The invention's effect】
As described above, according to the present invention, the lock of the push button is released by a combination of a plurality of push button operations. If it is a part of the push button operation, the lock is not released. Therefore, compared with the conventional push button switch in which unlocking is performed by a single push button operation, the unlocking accident due to erroneous contact is reliably reduced. In addition, since a plurality of push button operations cannot be performed unless they are intentionally performed, erroneous operations due to carelessness are reduced. On the other hand, since an accessory such as a guard ring is unnecessary, there is no hindrance to the operation, the installation space is small, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pushbutton switch attached to a panel according to an embodiment of the present invention.
2 is an exploded perspective view of the pushbutton switch of FIG. 1. FIG.
FIG. 3 is a plan view of the pushbutton switch of FIG. 1;
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a side view of the rotating cylinder in FIG. 2;
6 is a longitudinal sectional view of the frame in FIG. 2. FIG.
7 is a top view of the lock plate in FIG. 2. FIG.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
9 is a cross-sectional view taken along line IX-IX in FIG.
10 is an enlarged view of a P portion in FIG. 4;
11 is a diagram showing a state where the push operation is performed from FIG.
12 is a view showing a state in which a twisting operation is performed from FIG. 11. FIG.
FIG. 13 is a perspective view showing a state in which a conventional push button switch is attached to a panel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Panel 2 Pushbutton switch 4 Pushbutton 5 Rotating cylinder 6 Globe 7 Torsion coil spring 8 Frame 9 Push rod 10 Back spring 11 Lock pin 12 Compression coil spring 13 Lock plate 13b Lock flange 14 Base 15 Contact unit 16 Tightening ring A Orthogonal surface B inclined surface

Claims (1)

An operation unit having a push button that can be pushed, and a contact unit connected to the operation unit. The contact of the contact unit is switched by a push operation of the push button, and the operation unit includes the push button. A lock pin that is provided so as to freely enter and exit in a direction orthogonal to the pushing operation direction, and that is spring-biased in a protruding direction, and is provided over a twisting range of the push button so as to intersect the lock pin. An arc-shaped lock flange formed with an engagement surface to be engaged and an elastic member that applies a restoring force to the push operation and the twisting operation of the push button, and the push button is pushed from the unlocked state. When operated, the lock pin engages with the lock flange and is locked in the pushed state, and the push button is twisted from this locked state. Next, when the tensile operated, the push button switch having a locking mechanism engaging said locking pins are locked in the push button is released out,
The elastic member is a torsion coil spring, the engagement surface of the lock flange is inclined with respect to the orthogonal surface on one end side orthogonal to the center axis of the push button , and the tensile force of the push button. An inclined surface on the other end side that is inclined along the direction, and when the push button is pushed from the unlocked state, the lock pin passes over the lock flange and engages with the orthogonal surface to engage the push button. button is locked in the pushed-state, the push button from the locked state is twisting operation, then when it is pulling operation, it passes over the locking flange on the contrary the lock pin slides the inclined surface of the locking flange, A push button switch, wherein the push button is unlocked.

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