JPS6336898Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pull-lock type pushbutton switch.

This pull-lock type pushbutton switch is
When you press the pushbutton, it turns on (or off), but when you release the pressure, the pushbutton returns to its original neutral position and turns off (or on), and when you pull the pushbutton, it locks in the pulled state and turns on ( It is often used as a copying machine door switch, etc. In other words, when the copier door (maintenance lid) is closed, the pushbutton is pressed and turned on, turning on the copying machine, but when the door is opened, the pushbutton is pressed. It is used by returning to the original neutral position and turning off to turn off the power, and when performing maintenance and inspection work, pull the push button to lock it on.

By the way, all conventional push button switches of this type are constructed by reusing the mechanism of a single-pole double-throw micro switch, so there are problems with impact resistance and welding resistance at the on-point during operation. Also,
The drawback was that it required a large amount of mechanical space, so holes for screw attachment could not be provided inside the switch case.

In view of the above, the present invention solves problems such as the impact resistance and welding resistance of the contacts, and also makes the contact mechanism more compact and creates more space for screw mounting holes in the switch case. The object of the present invention is to provide a lock type push button switch.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of the pull-lock type pushbutton switch according to this embodiment in an exploded state with a cover (not shown) removed from a case 1, and is shown in cross section with a portion cut away. In FIG. 1, a case 1 has a sliding groove 2 extending vertically in the center thereof, and hollow portions 3 on both sides of this groove 2. Innermost part 2a of sliding groove 2
A return coil spring 12 is disposed, a slider 7 is disposed in the center portion 2b above it, and a push button 6 is disposed above it via a pressing coil spring 13. It protrudes from the upper surface 4 of the case 1. At the upper part of the sliding groove 2, the width is narrowed to form a narrow part 2c. As shown in FIG. 2, the push button 6 is provided with a hollow portion 6a, and a pressing coil spring 13 is disposed in the hollow portion 6a. A hollow portion 6a is provided on the side surface of this push button 6.
An elongated hole 6b is formed so as to communicate with the elongated hole 6a, and an elongated groove 6c is formed at a position circumferentially shifted by about 90 degrees with respect to the elongated hole 6a. This long groove 6c reaches as far as a sliding part 6d provided at the lower end of the push button 6, and divides the lower half of the push button 6 into two, with the long groove 6c becoming narrower and wider. It allows it to bend in any direction. An engaging pawl 7a at the upper end of the slider 7 is engaged with the elongated hole 6b, so that the pawl 7a can slide up and down in the elongated hole 6b. An engagement groove 7b is formed in the slider 7 near its approximate center, and this groove 7
A receiving plate portion 7c is formed above b. The movable piece 8 has a hole 8b in the center and movable contacts 8c at both ends, and the slider 7 is inserted into the hole 8b. Then, one end 11b of the reversing leaf spring 11 engages with the engagement groove 7b of the slider 7, and the other end 11a engages with the hole 8.
The reversing leaf spring 11 is attached so as to engage with the engaging protrusion 8a provided on the b side. When the reversing leaf spring 11 is attached in this manner, the movable piece 8 is urged upward and pressed against the lower surface of the receiving plate portion 7c.

The movable contacts 8c at both ends of the movable piece 8 protrude into the hollow portions 3 on both sides of the sliding groove 2, and a double-cut contact mechanism is formed in the hollow portions 3. That is, the fixed pieces 9 and 10 are fixed to the case 1, and the fixed contacts 9a and 10b at the tips thereof are disposed in the hollow part 3 so as to sandwich the movable contact 8c vertically. Since the contact mechanism is formed in this way, the space for the contact mechanism is small, and the contact mechanism and the sliding groove 2
Since there is a remaining space after excluding the space, it is possible to provide the screw mounting hole 5 in the case 1 using this remaining space.

In the above configuration, in a free state where the push button 6 is not operated at all, the slider 7 is urged upward by the return coil spring 12, and the slider 7 and the push button 6 maintain the neutral position. The state shown in Figure 1 will be reached. At this time, the movable contact 8c is connected to the upper fixed contact 1.
It is in contact with 0b.

When the push button 6 is pressed, the slider 7 is pushed downward via the pressing coil spring 13, and the movable contact 8c comes to separate from the upper fixed contact 10b as shown in FIG. When the push button 6 is further pressed, the movable contact 8c gradually approaches and contacts the lower fixed contact 9a. That is, a slow type operation of the contact is performed.

When the push button 6 is further pressed even after the movable contact 8c has come into contact with the fixed contact 9a in this way, the pressing coil spring 13 contracts, the claw 7a of the slider 7 slides inside the long length 6b of the push button 6, and the push button 6 is pressed again. Only 6 moves downwards and becomes as shown in Fig. 4. The amount of movement of only the push button 6 is overtravel, and this overtravel can be increased by lengthening the elongated hole 6b. When the push button 6 is released, the push button 6 and the slider 7 return to their neutral positions, resulting in the state shown in FIG.

Next, when the push button 6 is pulled upward, the claw 7a engages with the lower end of the elongated hole 6b, and the slider 7 is also pulled upward. At this time, as shown in FIG. 1, the movable piece 8 cannot move upward because the movable contact 8c is in contact with the fixed contact 10b. Therefore, slider 7
moves upward, one end 11 of the reversing leaf spring 11
b (the end of the slider 7 that engages with the engagement groove 7b) is located above the height of the other end 11a, but the height of one end 11b is higher than the height of the other end 11a. The moment the leaf spring 11 exceeds the height of , the urging force in the extension direction of the leaf spring 11 is reversed from a force that urges the movable piece 8 upward to a force that urges it downward. As a result, the movable piece 8 moves downward by a snap action, and the movable contact 8c contacts the lower fixed contact 9a. When the push button 6 is then pulled further, the lower part of the push button 6 is bent so that the sliding part 6d is sandwiched between the narrow width parts 2c and the width of the long groove 6c is narrowed, as shown in FIG.
The slider 7 is pinched by the lower part of the slider 7, and as a result the slider 7 is locked in this raised position. When locked in this manner, the movable contact 8c remains in contact with the lower fixed contact 9a. To release this, press the pushbutton 6 to release the lock and move the slider 7.
By lowering the plate spring 11 downward, the leaf spring 11 is reversed again, and its biasing force acts in the direction of pushing the movable piece 8 upward again. When this pressure is released, the state returns to the state shown in FIG. 1.

As described above with respect to the embodiments, the pull-lock type pushbutton switch according to the present invention includes a case 1, a lower end portion of which is closed, an upper end portion of which is open, and a narrow portion near the upper end. 2c
A sliding groove 2 extending in the vertical direction, and two fixed contacts 9 facing in the vertical direction provided in hollow parts 3 on both sides of this groove in the case.
a, 10b, a return coil spring 12 disposed at the lowest end of the sliding groove, and a push button 6 slidably engaged with the groove so as to protrude outside the case from the upper end of the sliding groove. , a slider 7 located between the return coil spring and the push button and slidably housed in the sliding groove; and a slider 7 attached to the slider via a reversal leaf spring 11. The movable piece 8 has a movable contact 8c that is attached to be located between the two fixed contacts in the portion of the movable piece that protrudes into the hollow portion on both sides of the sliding groove. The button has a hollow part 6a open at the lower end into which the upper end of the slider slides, and an engaging claw 7a provided at the upper end of the slider that is slidably engaged. It is characterized in that a matching elongated hole 6b that is long in the vertical direction and a long groove 6c that is open at the lower end are provided, and a pressing coil spring 13 is housed in this hollow portion. Therefore, the contact mechanism is formed in a double-cut shape and operates as a slow type when pressed, so that a large contact pressure can be obtained and impact resistance and welding resistance are improved. Furthermore, a hollow part is provided in the push button, and a pressing coil spring is housed in the hollow part, and the upper end of the slider is slidably inserted into the hollow part, and then the push button, slider, and return coil spring are slid together. Since it is placed inside the sliding groove, everything except the contact mechanism, which includes the movable piece that is attached to the slider and protrudes into the hollow parts on both sides of the sliding groove, fits within the sliding groove, making effective use of space. It is also easy to secure screw mounting holes in the case. Also, when the push button is pressed, the slider is first pushed downward via the pressing coil spring and the movable contact contacts the lower fixed contact, and then when the push button is pressed,
Overtravel (movement) occurs after the contact is turned on, as the pressing coil spring contracts, the slider's engagement claw slides upward through the elongated hole of the pushbutton, and only the pushbutton moves downward. It is easy to increase the amount by making the elongated hole longer. Furthermore, the pull-lock mechanism of the push button has a simple structure and its operation is reliable. In other words, when the push button is pulled, the lower end of the push button is caught between the narrow parts of the sliding groove and fixed in that position. A long groove is formed that opens toward the lower end, and the push button is bent so that the width of this long groove becomes narrower, so that the upper end of the slider that was inside the hollow part of the push button As a result, the slider is also locked in its raised position, thereby keeping the movable contact in contact with the fixed contact below.

[Brief explanation of drawings]

Fig. 1 is an exploded side view with a part cut away of the case of a pull-lock type pushbutton switch according to an embodiment of the present invention, and Fig. 2 is an exploded perspective view of a part of the same embodiment.
FIGS. 3, 4, and 5 are exploded side views of the case in each state of the same embodiment. 1... Case, 2... Sliding groove, 3... Hollow part,
4...Top surface, 5...Screw mounting hole, 6...Push button, 7...Slider, 8...Movable piece, 8c...Movable contact, 9, 10...Fixed piece, 9a, 10b... ... fixed contact, 11 ... plate spring for reversal, 12 ... coil spring for return, 13 ... coil spring for pressing.

Claims (1)

[Scope of utility model registration request] a case, a sliding groove provided in the case that extends in the vertical direction, the lower end of which is closed, the upper end of which is open, and a narrow portion near the upper end; and both sides of this groove in the case; two fixed contacts facing each other in the vertical direction provided in a hollow part of the unit, a return coil spring disposed at the lowest end of the sliding groove, and a coil spring for return disposed at the lowermost end of the sliding groove; a push button slidably engaged with the push button; a slider positioned between the return coil spring and the push button and slidably housed in the sliding groove; A movable piece attached via a reversing leaf spring, and a movable piece attached so as to be located between the two fixed contacts in the portions of the movable piece that protrude into the hollow portions on both sides of the sliding groove. The push button has a hollow part open at the lower end side into which the upper end of the slider can slide freely, and an engagement provided at the upper end side of the slider. A pull having a vertically elongated hole with which the pawl engages in a slidable manner and a long groove open at the lower end, and a pressing coil spring is housed in the hollow part. Lock type push button switch.