JPH0338917Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field covered] This invention relates to an improvement of a push switch equipped with a pair of levers having pivot points at opposite positions.

[Conventional equipment and its problems]

Conventionally, this type of press switch is shown in Figures 6 and 7.
Snap switch 8 on base 1 as shown in the figure.
0, 80, and one end of the base 1 rotatably supports one end of an operating lever 27 for pressing the plunger 81 of the snap switch 80, 80, and the other end of the base 1 rotatably supports the operating lever 27.
There is a device in which one end of the operating lever 33 for operating the lever is rotatably engaged, and the free ends of both levers are connected to each other in a freely reversible manner by a coil spring 43, but during this operation, the operating lever 27 is reversed. Since the rear snap switches 80, 80 are reversed, the reversal operation is in two stages, resulting in wasted switching operation.In addition, the plunger 81 of the snap switch 80 has to rotate the operating lever 27 in order to reduce the operating force of the switch. It must be located near the fulcrum. This relationship is shown in FIG. In this figure, when the operating lever 27 is pressed and rotates clockwise about the fulcrum P2, the plunger 8 of the snap switch 80
1, and a force F is applied to this plunger in a direction that intersects with this axis. Therefore, friction occurs between the housing 82 of the snap switch 80 and the plunger 81, and both wear out. Furthermore, powder generated by the wear adheres to the contacts, and eventually the snap switch 8
0 may cause malfunction. Furthermore, the sliding action between the actuating lever 27 and the plunger 81 is also deteriorated, and there is a disadvantage that the operating force of the push switch as a whole increases.

〔the purpose〕

In view of these conventional drawbacks, this invention attempts to obtain a press switch with stable operating characteristics over a long period of time by minimizing the number of sliding parts in the operating mechanism.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

That is, in FIGS. 1 to 5, a base 1 is composed of a support base 2 and terminal bases 3, 3, and the support base 2 has a plurality of holes 4,
4, and above it a stepped slope 5 whose height gradually increases from one end to the other.
Further, a supporting portion 7 is provided in a protruding manner above the slope 5 on the other end side, and recessed portions 8, 8 forming a fulcrum P1 are formed on the outside of this supporting portion. In addition, fitting protrusions 11, 11 are provided on each side of the terminal bases 3, 3 to be inserted into the holes 4, 4, and by fitting these fitting protrusions into the holes 4, 4, the terminals can be inserted. The base 3 is integrally formed with the support base 2. Common terminal 12 on terminal base 3
A pair of fixed terminals 13 and 14 are integrally formed by molding, and the common terminal 12 is located at one end side of the terminal base 3, and the fixed terminals 13 and 14 are integrally formed by molding.
14 is located on the other end side of the terminal base 3 and faces each other at a predetermined interval. A notch 15 is provided on one side of the terminal base 3, and the fixed terminals 13, 14 have fixed contacts 16,
17 are provided respectively. Movable contact 21
is composed of an elastic plate-like body, and one end thereof has a connecting part 24 formed by bent parts 22 and 23, and the bent end 25 engages with the notch part 15, thereby preventing rotation. A fulcrum P2 is formed.
Furthermore, the free end of the movable contact 21 is connected to the fixed terminal 1.
3, 14 and has a fixed contact 1 at its free end.
A movable contact 26 is provided which selectively contacts 6 and 17. One end of the actuating lever 27 is connected to one end of the movable contact 21 , that is, the connecting portion 24 , and its free end extends parallel to the movable contact 21 . In this embodiment, the operating lever 27
The movable contact 21 and the movable contact 21 are integrally molded, and the bent end 25 of the movable contact 21 protrudes from the connecting portion 28 of the operating lever 27. When the bent end 25 of the movable contact 21 is engaged with the notch 15 of the common terminal 12, the free end of the operating lever 27 extends from one end of the base 1 to the other end. There is. Furthermore, this operating lever is formed in a U-shape, and has a convex portion 29 on the inside of its free end and a regulating convex portion 30 on the outside thereof.
are each provided integrally. Support base 2
A regulating window 6 into which the regulating protrusion 30 is fitted is provided on the wall surface on which the supporting portion 7 is provided, and the upper and lower edges of the window 6 regulate the upper and lower limits of the free end of the operating lever 27. is being used. In other words, the restriction convex portion 30 and the restriction window 6 form a restriction portion.

Edges 34, 34 formed at one end of the operating lever 33 are engaged with the recesses 8, 8 provided on the other end side of the base 1, that is, the support portion 7, and are rotatable about the fulcrum P1. . A tongue piece 35 extending toward the base 1 is integrally formed on the free end of this operating lever, and a heart-shaped cam 36 and a groove 37 formed around the cam are provided on one side of the tongue piece. It is being Further, a guide groove 38 is formed in an arc shape around the edge 34 on the other side of the tongue piece 35, and an engaging step portion 39 is provided at the lower end of this guide groove. On the other hand, the inner side of one end of the operating lever 27 is slidably engaged with a guide groove 38, and the free end of the operating lever 33 is rotated by a predetermined angle in a direction away from the base 1 and comes into contact with a stepped portion 39. An engaging convex portion 31 is provided, and the engaging convex portion 31 and the stepped portion 39 form an engaging portion. Further, a convex portion 40 is provided on the inside of the tongue piece 35 of the operating lever 33. A coil spring 43 is provided between the operating lever 33 and the actuating lever 27, and one end thereof engages the convex portion 29 and the other end engages the convex portion 40, so that the free end of the actuating lever 27 The free end portions of the operating lever 33 are biased in the direction of separating from each other, and the engaging convex portion 31 is adapted to engage with the engaging stepped portion 39. Further, a hook spring 45 formed by bending an elastic linear body is accommodated in the recess 9 of the support base 2, one end of which is held by the support base 2 within the recess 9, and its free end The part slides in the groove 37 of the tongue piece 35, and
A hook portion 4 that selectively engages with a heart-shaped cam 36
6. Further, a pair of engaging protrusions 10, 10 are provided on the outer periphery of the base 1, that is, on the outside of the terminal bases 3, 3, respectively.

FIG. 3 shows a switch assembly 50 which is housed in a housing 51. As shown in FIG. The lower end of this housing 51 is provided with engagement holes 52, 52 that engage with the engagement protrusions 10, 10. are inserted into the housing 51 from below and engaged with each other, thereby fixing the switch assembly 50 to the housing 51. Further, engagement pins 41, 41 are provided protruding from both sides of the middle portion of the operating lever 33. A light emitting element unit 55 is housed within the housing 51 and is held by the housing 51. This light emitting element unit consists of a socket 57 provided on a printed circuit board 56, a light emitting element 58 (for example, a light emitting diode) attached to this socket, resistors 59, 59, and terminal pieces 60, 60 fixed to the printed circuit board 56. It is configured. The plunger 65 that operates the operating lever 33 has a hole 66 that penetrates the light emitting element 58 and a reflective wall 67 that reflects the light from the light emitting element 58.
A push button 69 is fitted to one end of the push button via a collar plate 68. Also plunger 65
A pair of legs 71, 71 extend from the other end, and an engagement recess 7 that engages with the engagement pins 41, 41 is provided at the end thereof.
2,72 are provided. Note that the power supply terminal piece 7
5 and 75 have their ends connected to holes 76 and 7 of the support base 2.
6, and the other end is inserted into the terminal piece 6.
It is in electrical contact with 0,60.

〔motion〕

Now, in the states shown in FIGS. 1, 4, and 5, the operating lever is in a free state. In this state, the actuating lever 2 is moved by the urging force of the coil spring 43.
The engaging convex portion 1 of 7 is engaged with the stepped portion 39 of the operating lever 33, that is, the engaging portion. Furthermore, as shown in FIG.
As a result, the movable contact 21 integrated therewith receives a counterclockwise torque around the engagement point P2 between the notch 15 and the bent end 25 of the actuating lever 27. Therefore, the movable contact 26 is in contact with the lower fixed contact 16 with its component force F2. When the push button 69 is pressed in this state, the plunger 65 descends, thereby rotating the operating lever 33 clockwise about the fulcrum P1 from the state shown in FIG. 5A, thereby compressing the coil spring 43. At this time, the center b of the convex portion 40 that receives the other end of the coil spring 43 of the operating lever 33 is located at a point closer to the straight line 11 connecting the engagement point P2 and the center a of the convex portion 29 that receives one end of the coil spring 43 of the operating lever 27. It's on the top. Fifth
When the center b of the convex portion 40 that receives the other end of the coil spring 43 of the operating lever 33 passes through the straight line 11 connecting the engagement point P2 and the center a of the convex portion 29 as shown in FIG. Actuating lever 2 as shown
7 is reversed. As a result, the movable contact 26 of the movable contactor 21 is reversed from the normally closed fixed contact 16 to the normally open fixed contact 17. This inverted state is maintained by the engagement between the hook spring 45 and the heart cam 36. Next, when the push button 69 is pressed again in this state, the hook spring 45 and the heart-shaped cam 36 are disengaged, and the biasing force of the coil spring 43 moves the center b of the protrusion 40 between the fulcrum P2 and the center of the protrusion 29. When the line 11 connecting a is crossed above, the operating lever 27 is reversed and returned, and the movable contact 21 is reversed from the normally open fixed contact 17 to the normally closed fixed contact 16, and as shown in FIGS. Return to the initial state shown in FIG. 5A.

〔effect〕

As mentioned above, this invention has a common terminal 12 on one end side of the base 1, and a fixed terminal 13 on the other end side.
14, and one end of a movable contactor 21 that selectively contacts the fixed terminal is electrically engaged with the common terminal 12 so as to form a rotation fulcrum,
An operating lever 27 extending from one end of the base 1 toward the other end is integrally connected to the movable contactor 21, and one end of an operating lever 33 that uses this base as a pivot point is engaged with the other end of the base 1. and a coil spring 43 is provided between the free end of this operating lever and the free end of the operating lever 27.
Not only is there no sliding between the actuating lever and the plunger of the snap switch as in the conventional case, but also a wiping action is performed on the fixed terminals 13 and 14 when the switch, that is, the movable contact 21 is reversed, resulting in extremely good operating characteristics. Moreover, it is possible to obtain a switch that is highly reliable over a long period of time.
In addition, the number of man-hours required for assembling the switch can be reduced, and the structure is simple.
It has the advantage of having fewer parts and being able to be supplied at low cost.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the pressure switch in this invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is an external perspective view of the switch assembly.
Fig. 4 is a front view, Fig. 5 A, B, and C are operation explanatory diagrams explaining the process from the free state to the reversal of the operating lever, Fig. 6 is a front view of a conventional press switch, and Fig. 7 is A perspective view showing another conventional switch,
FIG. 8 is a front view showing the relationship between the lever and the plunger. 1...Base, 2...Support base, 3...Terminal base, 4...Hole, 5...Slope, 6...Regulation window,
7... Support part, 8... Recessed part, 9... Recessed part, 10...
...Engagement protrusion, 11... Fitting protrusion, 12... Common terminal, 13... Fixed terminal, 14... Fixed terminal, 15
... Notch, 16 ... Fixed contact, 17 ... Fixed contact, 21 ... Movable contact, 22 ... Bending portion, 2
3...Bending part, 24...Connecting part, 25...Bending end, 26...Movable contact, 27...Operating lever, 28...Connecting part, 29...Convex part, 30...Regulation convex Part, 31... Engaging convex portion, 33... Operating lever, 34... Edge, 35... Tongue, 36... Cam, 37... Groove, 38... Guide groove, 39... Engaging stepped portion , 40...Convex portion, 41...Engagement pin, 43
...Coil spring, 45 ...Hook spring, 4
6...Key part, 50...Switch assembly, 51
... Housing, 52 ... Engagement hole, 55 ... Light emitting element unit, 56 ... Printed circuit board, 57
...Socket, 58 ... Light emitting element, 59 ... Resistor, 60 ... Terminal piece, 65 ... Plunger, 6
6... Hole, 67... Reflective wall, 68... Color plate, 69... Push button, 71... Leg, 72... Engagement recess, 75... Power supply terminal piece, 76... Hole.

Claims (1)

[Scope of utility model registration request] A movable contact is provided with a common terminal 12 on one end of the base 1 and a pair of fixed terminals 13 and 14 facing each other at a predetermined interval on the other end, and selectively contacts these fixed terminals. Child 21
One end of the movable contact 2 is electrically engaged with the common terminal 12 so as to form a pivot point.
1 is integrally connected with an operating lever 27 extending from one end of the base 1 toward the other end, and the other end of the base 1 is engaged with one end of an operating lever 33 that uses this base as a pivot point. A coil spring 43 is provided between the free end of this operating lever and the free end of the operating lever 27, and a tongue piece 35 extending toward the base 1 is provided at the other end of the operating lever 33. On the inner side of the end of the piece and one end of the operating lever 27, there is an engaging stepped portion 39 and an engaging convex portion 31 that engage with each other in a state in which both levers are opened at a predetermined angle relative to each other around their respective rotational fulcrums. and a regulating protrusion 30 is provided on the free end of the operating lever 27, and the base 1 is engaged with the regulating protruding part 30, and the free end of the operating lever 27 is provided with a regulating protrusion 30. A regulating window 6 is provided to regulate the upper and lower limits on the side, and the operating lever 27 is reversed by the operating lever 33 and the coil spring 43 to switch the movable contact 21 between the fixed terminals 13 and 14. Press switch.