JPH04502Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a heart-shaped cam, a U-shaped member that engages with the heart-shaped cam, and biasing means for the U-shaped member. This relates to a step-operation push button switch.

[Prior Art] A slider having a movable contact piece fixed thereto, a casing that slidably supports the slider, a fixed contact piece fixed to the casing, and a heart-shaped cam provided on the slider. , one end of the U-shaped member is engaged with the heart-shaped cam, the other end of the U-shaped member is pivotably supported relative to the housing, and the U-shaped member is connected to the heart-shaped cam. Push-button switches are known which provide a two-step actuating function to the slider described above by providing means for biasing the slider toward the slider. FIG. 1 is an explanatory diagram of this type of push button switch, and FIG. 2 is a perspective view of a portion of the constituent members.

1 is a housing, 6 is a base member constituting the bottom wall thereof, and the slider 4 is slidably supported by these two members. 9 is a switch mounting member.

Two fixed contact pieces 7 are fixed to the base member 6, while a movable contact piece 5 is fixed to the slider 4. As a result, as the slider 4 slides, the movable contact piece 5 comes into contact with either of the two fixed contact pieces 7, 7, and conduction is switched. Reference numeral 5 drawn in solid lines in FIG. 2 represents the movable contact piece in the disassembled state, and reference numeral 5' drawn in phantom lines represents the movable contact piece in the state in which it is assembled into the slider 4. 12 is a knob for a push button, 11 is a press-fit rod connecting the slider and the knob, and 10 is a return spring.

In order to provide the slider 4 with a two-stage operating function, a heart cam 4a is formed on the slider 4, and a U-shaped member 2 that engages with the heart cam is provided. One end 2a of the U-shaped member 2 is inserted into a pivot hole 1a provided in the housing 1, and the other end 2b
is engaged with the groove 4b of the heart cam 4a. In the push button switch configured in this way, if a pressing force is applied to the convex side surface of the U-shaped member 2 as shown by the arrow P, the U-shaped member 2 will be pressed as the slider slides.
The free end 2b of is guided by the heart cam groove 4b and the 2
Performs stage operation function. 4c is a groove provided in the slider 4 to avoid interference between the slider 4 and one end 2a of the U-shaped member.

In order to apply a pressing force in the direction of arrow P to the U-shaped member 2, a U-shaped leaf spring U is interposed between the U-shaped member 2 and the inner surface of the top of the housing 1, as shown in FIG. equipped. 1i is a mounting part of a U-shaped leaf spring formed by expanding a part of the housing 1; 1j
is a hook-shaped projection integrally formed on its edge.

In the conventional push button switch (FIG. 3) constructed as described above, a pressing force in the direction of arrow P is applied by the U-shaped leaf spring U to perform a two-stage operation function. When the above U-shaped leaf spring is installed in the specified position, the end of the U-shaped leaf spring will be attached to the hook-shaped protrusion 1.
Since the U-shaped leaf spring is engaged with J, there is no risk of the U-shaped leaf spring falling off.

[The problem that the idea aims to solve]

However, the conventional push button switch described above has the following problems.

(a) It is not easy to insert the U-shaped leaf spring through the opening 1k of the mounting portion 1i while pressing it, and it is not possible to check whether the mounting state is good or not. Furthermore, once installed, it is extremely difficult to remove.

(b) The state of contact between the U-shaped leaf spring and the U-shaped member 2 is unstable. That is, the U-shaped leaf spring U is interposed between the U-shaped member 2 and the inner surface of the mounting portion 1i, and the U-shaped leaf spring U is restrained from restoring due to its own elasticity, and maintains the position and posture according to the conditions at that location. As a result, the state of contact between the U-shaped leaf spring and the U-shaped member 2 is not constant. For this reason, the locking function of the push button switch is unstable and its operation reliability is low.

It is an object of the present invention to improve the problems of the prior art as described above, and to provide a two-stage push button switch that is equipped with a biasing means that is easy to attach and detach, has a stable locking function, and has high operational reliability.

[Means to solve the problem]

In order to achieve the above object, the push button switch of the present invention includes a slider to which a movable contact piece is fixed, a casing that slidably supports the slider, and a fixed contact piece fixed to the casing. and a heart-shaped cam is provided on the slider, one end of the U-shaped member is engaged with the heart-shaped cam, and the other end of the U-shaped member is rotatably supported with respect to the casing; In a push button switch in which a U-shaped leaf spring is used as a means for biasing this U-shaped member toward a heart-shaped cam, and a housing portion for the U-shaped leaf spring is formed in the upper part of the housing, the housing portion A long hole for incorporating the U-shaped member from above, a fixing hole on the front side that intersects with the long hole, and a viewing hole on the rear side are provided at the top of the
Furthermore, a protrusion is formed on the inside of the rear wall of the storage part, and an arcuate projection is formed on the outside of the free end of the U-shaped leaf spring, and when the U-shaped leaf spring is stored in the storage part, The bent portion of the U-shaped leaf spring is positioned by the inner surface of the top of the storage portion and the protrusion on the inner side of the rear wall, and the arc-shaped projection of the U-shaped leaf spring is engaged with the fixing hole intersecting the elongated hole. It is characterized by having

[Effect]

As described above, when the U-shaped leaf spring is stored in the storage part, the bent part of the U-shaped leaf spring is positioned by the inner surface of the top of the storage part and the protrusion inside the rear wall, and the U-shaped leaf spring is Since the arc-shaped protrusion of the U-shaped leaf spring is engaged with the fixing hole that intersects with the elongated hole, the location where the other free end of the U-shaped leaf spring contacts the U-shaped member and the direction and magnitude of the biasing force are controlled. It becomes substantially constant and the action of the U-shaped member can be stabilized.

Furthermore, since the mounting state of the U-shaped leaf spring can be visually checked through the fixing hole and the viewing hole, there is no risk of assembly failure.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to FIGS. 4 and 5.

FIG. 4 is a cross-sectional view showing an example of a push-button switch in which the present invention is applied to the conventional push-button switch shown in FIG. 3, and FIG. 5 is an exploded perspective view of the push-button switch. A housing 1 with the same drawing reference numbers as in FIGS. 1 to 3;
The pivot hole 1a, the U-shaped member 2, the slider 4, the movable contact piece 5, the base member 6, the fixed contact piece 7, the switch mounting member 9, the return spring 10, and the knob 12 are the same as or similar to those in a conventional push button switch. It is a constituent member of

The protrusion 6a of the base member 6 shown in FIG. 5 is fitted into the through hole 1d of the housing 1 with a snap fit.

Further, the U-shaped bracket 8 fits into grooves 1c formed on both sides of the housing 1 to hold the housing 1, and its both ends 8a are engaged with the through holes 9b of the switch mounting member 9 to be caulked. This is for attaching a switch by attaching it. 9a is a through hole through which the slider 4 is passed. A knob 11 is fixed to the tip of the slider passed through this through hole via a press-fitting rod 12, and a return spring 10 is disposed between the knob 11 and the fixing member 9.

A housing portion 1 for a U-shaped leaf spring 30 is provided on the top surface of the housing 1.
b, and this storage portion 1b has a U-shaped leaf spring 3.
0 and an elongated hole 1g for inserting the U-shaped member 2 into a predetermined position from above the housing 1, and further for fixing the U-shaped leaf spring 30. A fixing hole 1e on the opening 1k side that intersects with the elongated hole 1g and a viewing hole 1e' on the rear side that also intersects with the elongated hole 1g are provided, and a horizontal protrusion is provided inside the rear wall 1m of the storage portion 1b. Part 1f
are arranged as shown in FIG. The U-shaped leaf spring 30 stored in the storage portion 1b has a bent portion 30c.
and an arcuate projection 30 formed on the outside of the free end.
a, 30b, and when this U-shaped leaf spring 30 is forcibly inserted into the opening 1k of the storage portion 1b from the bent portion 30c side, the bent portion 30c is inserted between the protrusion 1f and the top of the storage portion 1b. At the same time, the arc-shaped projection 30b is engaged with and fixed in the fixing hole 1e, and the U-shaped member 2 can be pressed by the arc-shaped projection 30a at the other end.

The push button switch constructed as described above has good workability because the U-shaped member 2 can be inserted into the housing 1 through the elongated hole 1g. Further, when the U-shaped plate spring 30 is inserted into the opening 1k from the bent portion 30c side, it can be inserted while being pressed in the fixing hole 1e and the viewing hole 1e' of the housing 1, so that it can be easily attached and removed.

Furthermore, the mounting position and mounting posture of the U-shaped leaf spring 30 are such that the bent portion 30c of the U-shaped leaf spring 30 is regulated by the protruding portion 1f, and the arc-shaped protrusion 30b
Since the free end 30a is regulated by engaging with the fixing hole 1e, the location where the free end 30a contacts the U-shaped member 2 and the direction and magnitude of the biasing force are always substantially constant. Therefore, the locking action of the slider 4 is stabilized, and the force for pushing the knob can be kept constant.

Furthermore, the mounting state of the U-shaped leaf spring 30 is the same as that of the fixing hole 1.
Since it can be visually observed through e and viewing hole 1e', there is no risk of assembly failure.

[Effect of idea]

As detailed above, according to the present invention, the U-shaped leaf spring, which is the biasing means for the U-shaped member, can be easily attached and detached, and furthermore, the locking function is stable and the two-stage operation is highly reliable. You can get a push button switch.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional two-stage push button switch, with Figure 1 being a longitudinal sectional view, Figure 2 being an exploded perspective view of the locking mechanism components, and Figure 3 being the lock mechanism energizing switch. It is an explanatory diagram of means. 4 and 5 show an embodiment of the push button switch of the present invention,
FIG. 4 is a longitudinal sectional view, and FIG. 5 is an exploded perspective view. 1...Casing, 1a...Pivot hole, 1b...U-shaped spring housing, 1e...Fixing hole, 1e'...
Visual hole, 1f... protrusion, 1g... long hole, 1k...
Opening, 1m... Rear wall, 2... U-shaped member, 3
0... U-shaped leaf spring, 30a, 30b... Arc-shaped projection, 4... Slider, 4b... Heart-shaped cam groove, 5... Movable contact piece, 6... Base member, 7...
Fixed contact piece, 8... Bracket, 9... Switch mounting member, 10... Return spring, 12... Knob.

Claims (1)

[Scope of utility model registration request] It has a slider to which a movable contact piece is fixed, a casing that slidably supports the slider, and a fixed contact piece fixed to the casing, and a heart-shaped cam is provided on the slider, and the heart-shaped cam is provided with a heart-shaped cam. A U-shaped member having one end engaged with the cam is provided, the other end of the U-shaped member is pivotally supported relative to the housing, and the U-shaped member is biased toward the heart-shaped cam. In a push button switch that uses a U-shaped leaf spring and has a storage portion for the U-shaped leaf spring formed in the upper part of the housing, the top of the storage portion is provided with a long hole for assembling a U-shaped member from above. , a fixing hole on the front side and a viewing hole on the rear side intersect with the elongated hole, and a protrusion is formed on the inside of the rear wall of the storage part, while the outside of the free end of the U-shaped leaf spring form an arcuate protrusion on the
When the U-shaped leaf spring is stored in the storage portion, the bent portion of the U-shaped leaf spring is positioned by the inner surface of the top of the storage portion and the protrusion inside the rear wall, and the circle of the U-shaped leaf spring is A push button switch characterized in that an arc-shaped projection is engaged with a fixing hole that intersects with the elongated hole.