JPH0468724B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a push switch in which the on-off switching point is shifted due to the reciprocation of the shaft portion.

Conventional configuration and its problems An example of a conventional push switch of this type is shown in the first example.
and FIG. That is, this push switch is operated by the leaf springs 30, 3 inside the housing 36.
1, when the movable terminal 32 is moved and switched, the switching point differs in the reciprocation of the shaft 33 depending on the position of the movable terminal 32, so that the on-off switching point is shifted. In the OFF state, as shown in FIG. 1, the movable terminal 32 is pushed downward by the leaf springs 30 and 31 located on both sides of the movable terminal 32, and the movable contacts 34a and 34b provided on the movable terminal 32 are pressed downward. Fixed contacts 35a, 3 provided on terminals 37, 38
5b is far away. At this time, when the shaft 33 is pushed, the leaf springs 30, 31 on both sides are bent, and the movable terminal 32 is lifted upward by the reaction of the leaf springs 30, 31, and the contacts 34a, 34b, 35 as shown in FIG.
a and 35b are turned on. Axis 33 when turned off
Due to this movement, the leaf springs 30 and 31 open and push the movable terminal 32 downward. At this time, the position of the movable terminal 32 is different from when it changes from on to off, and this position difference appears as a shift in the on-off switching point. Note that the shaft 33 is always urged in a direction to project outward by a return spring (not shown).

However, since this push switch switches between on and off by the deflection of the leaf springs 30 and 31, the switching point is likely to be influenced by the strength and properties of the leaf springs 30 and 31, resulting in variations in the switching position and The disadvantage is that the bent leaf spring sometimes inverts, producing noise and causing inconvenience during use.

In contrast, a first improved example of a push switch that does not cause variations in switching position deviation and does not generate noise during switching is shown in FIGS. 3 to 7. That is, in the figure, 1 indicates a shaft, and 2 indicates a housing, on which are fixed a terminal 3 and a pair of fixed contact pieces 3a for connection with the outside.
In addition, a base plate 6, which serves as the top of the housing 2 for holding the shaft 1, is fixed, and the shaft 1 is slidably inserted into the base plate 6 by an external force F, and is held by a return spring 5. It is automatically restored. The shaft 1 has a groove 1a into which the movable contact piece 4 is loosely fitted, and is formed at an angle that intersects the sliding direction.The movable contact piece 4 has a spring property and is made of a conductive material. Due to its elasticity, it comes into elastic contact with the inner surface of the housing 2 to generate friction, and is held by the friction corresponding to the gap width 1 provided between the shaft 1 and the groove 1a. While FIGS. 3 and 4 show the off state, FIG. 5 shows the on state, that is, the state in which the shaft 1 has been moved by an external force. When an external force is applied to the shaft 1, only the shaft 1 moves by the gap width 1 of the groove 1a, and then the movable contact piece 4 moves following the shaft 1, and the fixed contact piece 3a on the inner surface of the housing 2 moves. It turns on when it comes in contact with. The amount of protrusion of the shaft 1 at this time is _L1 . 6 shows the maximum movement of the shaft 1, and FIG. 7 shows the moment when the external force applied to the shaft 1 is gradually removed and the movable contact piece 4 separates from the fixed contact piece 3a. In this way, when the external force is gradually removed from the maximum movement of the shaft 1, only the shaft 1 moves in the return direction by the gap width l of the groove 1a, and after that, the movable contact piece 4 moves following the shaft 1. The contact will turn off. The amount of protrusion of shaft 1 at this time is _L2 . As a result, the amount of protrusion of shaft 1 when turned on is L ₁
A difference occurs between the amount of protrusion _L2 of the shaft 1 when it is turned off, and the difference l between _L1 and _L2 becomes the deviation between the contact on and off due to the reciprocation of the shaft 1. Therefore, by reciprocating the shaft 1, it is possible to generate a shift in the on/off state of the contact.

Next, a second example of improvement is shown in FIGS. 8 to 12. That is, this push switch has a pair of grooves 1a, 1a' on both sides of a shaft 1', and
In addition to providing movable contact pieces 4, 4' on a and 1a',
A pair of fixed contact pieces 3a, 3a' and terminals 3, 3' connected to the fixed contact pieces 3a, 3a' are provided in the housing 2', corresponding to each movable contact piece 4, 4'. This push switch has two independent circuits,
Position and width of grooves 1a, 1a' and contact pieces 4, 4',
They can be set individually depending on the positional relationship between 3a and 3a', and different hysteresis can be created as shown in FIG.

Note that the grooves 1a and 1a' may be holes.

According to these improved examples, the on-off switching point causes a deviation determined by the width of the groove, and does not depend on the leaf spring of the above-mentioned technical example, so there is no variation.
Also, since the deflection of the leaf spring is not used, no inconvenient noise is generated.

However, the first improvement example and the second improvement example had the disadvantage of poor productivity because the work of inserting the movable contact piece 4 into the groove 1a was complicated.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a push switch that can improve productivity and provide stable hysteresis.

Structure of the Invention The present invention includes a container housing, a fixed contact piece provided on the inner surface of the container housing, and a fixed contact piece provided on the bottom surface of the container housing in a direction that is slidably inserted into the top of the container and protrudes to the outside. a shaft biased by a return spring disposed in the housing; a groove formed in the shaft in a direction perpendicular to the sliding direction; A sliding body slidably mounted in a guide groove provided, and a movable contact piece fixed to the sliding body and having one end elastically contacted with the inner surface of the casing having the fixed contact piece, When the shaft is pushed, the sliding body is moved on one side of the groove, and when the shaft is returned, the sliding body is moved on the opposite side of the groove, thereby moving the movable contact piece fixed to the sliding body to the It comes into contact with and separates from the fixed contact piece.

According to the configuration of this invention, when the shaft is pushed against the return spring, the shaft moves by a predetermined amount with respect to the sliding body, and then the sliding body is moved on one side of the groove, and when the shaft is released, the return spring is activated. After the shaft has moved a predetermined amount relative to the sliding body, the sliding body is moved on the opposite side of the groove, thereby causing a shift between the on position and the off position of the shaft. In this case, since the sliding body slides on the guide groove in the housing, the friction required to create hysteresis can be stably obtained. In addition, since the movable contact piece is fixed to the sliding body and the sliding body is fitted into the groove of the shaft and installed in the container housing, it is a simple operation, which improves productivity. Furthermore, since the return spring is located inside the device case, when the switch is installed in the device, there is a possibility that the axis may become unable to operate or become difficult to operate due to external factors such as a foreign object getting caught in the return spring. Malfunctions can be prevented.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention is shown in FIGS. 13 to 15. That is, this push switch is provided with a pair of grooves 1b and 1b' on both sides of the shaft 1" along a direction perpendicular to the sliding direction of the shaft 1", and a pair of grooves 1b and 1b' are provided on both sides of the shaft 1", and grooves are provided in the sliding direction of the shaft 1" inside the housing 2". A guide groove 7 is provided, and sliding bodies 8 and 8a that are loosely fitted into the grooves 1b and 1b' and movable within the guide groove 7 are provided. And movable contact pieces 4a, 4 that come into contact with and separate from fixed contact pieces 3a, 3a'
a' is fixed to the sliding bodies 8, 8a, and when the shaft 1'' is pushed, the sliding bodies 8, 8 are fixed on one side of the grooves 1b, 1b'.
a, and when the shaft 1'' returns, the grooves 1b and 1
By moving the sliding bodies 8, 8a on opposite sides of b', the movable contact pieces 4a, 4a' are moved to the fixed contact piece 3.
a, 3a'. In addition, movable contact piece 4a,
The configurations of the terminals 3, 3' connected to the fixed contact pieces 3a, 3a' with which 4a' comes into contact, the return spring 5, etc. are the same as those of the improvement example described above, and therefore their explanation will be omitted. This push switch connects the contact pieces 4a, 4' to the sliding body 8,
8a, and as the shaft 1'' moves, the sliding bodies 8, 8
By moving a in the groove of the casing 2'',
Stable friction is obtained to provide hysteresis. That is, when the shaft 1'' is pushed against the return spring 5, the shaft 1'' moves by a predetermined amount relative to the sliders 8, 8a, and then the sliders 8, 8a are moved on one side of the grooves 1b, 1b'. When the shaft 1'' is released, the return spring 5 moves the shaft 1'' by a predetermined amount relative to the sliders 8, 8a, and then the sliders 8, 8a are moved on the opposite sides of the grooves 1b, 1b', thereby A deviation occurs between the on position and the off position of 1". In this case, the sliding bodies 8, 8a slide against the guide groove 7 in the housing 2", so that the friction for producing hysteresis can be stably obtained. Furthermore, movable contact pieces 4a, 4a' are fixed to the sliding bodies 8, 8a, and the sliding bodies 8, 8a are connected to the grooves 1b, 1'' of the shaft 1''.
Since it is a simple task to install it inside the housing 2'' while fitting it into the housing 2'', productivity can be improved.
Furthermore, since the return spring 5 is disposed inside the housing 2'', when the switch is installed in the device, the axis 1'' may not be able to operate due to external factors such as a foreign object getting caught in the return spring 5. This can prevent malfunctions such as sluggishness.

Effects of the Invention As described above, according to the button switch of the present invention, since the sliding body slides in contact with the guide groove in the housing, the friction for producing hysteresis can be stably obtained. In addition, a movable contact piece is fixed to the sliding body,
Productivity can be improved since the sliding body can be simply mounted in the housing by fitting it into the groove of the shaft. Furthermore, since the return spring is located inside the housing, when the switch is installed in a device, there is a possibility that the axis may not be able to operate or become difficult to operate due to external factors such as a foreign object getting caught in the return spring. This has the effect of preventing defects.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the conventional push switch, Figure 3 is a cross-sectional view of the first improved example in the OFF state, Figure 4 is a cross-sectional view along the - line, and Figure 5 is a cross-sectional view of the ON operation process. 6 is a sectional view at the maximum push in the ON operation process, FIG. 7 is a sectional view at the instant of OFF, and FIG. 8 is a sectional view in the OFF state of the second improvement example.
FIG. 9 is a sectional view taken along the - line, FIG. 10 is a sectional view at the time of maximum pushing, FIG. 11 is a bottom view, and FIG. 12 is an explanatory diagram showing hysteresis at the on-off switching point.
FIG. 13 is a cross-sectional view of an embodiment of the present invention in the off state, FIG. 14 is a cross-sectional view taken along the - line, and FIG. 15 is a cross-sectional view at maximum pushing. 1″...Shaft, 1b, 1b'...Groove, 2″...Case,
3a, 3a'... fixed contact pieces, 4a, 4a'... movable contact pieces, 5... return spring, 7... guide groove,
8, 8a...Sliding body.

Claims (1)

[Claims] 1. A container casing, a fixed contact piece provided on the inner surface of the casing, and a return spring slidably inserted into the top of the casing and arranged on the bottom surface of the casing in a direction protruding to the outside. A shaft biased by a shaft, a groove formed on this shaft in a direction perpendicular to the sliding direction thereof, and a shaft that is loosely fitted in this groove and slid in a guide groove provided in the sliding direction in the housing. A movable contact piece is provided with a movably mounted sliding body and a movable contact piece that is fixed to the sliding body and has one end in elastic contact with the inner surface of the housing having the fixed contact piece, and when the shaft is pushed, the movable contact piece By moving the sliding body on one side of the groove and moving the sliding body on the opposite side of the groove when the shaft returns, the movable contact piece fixed to the sliding body can be brought into contact with and separated from the fixed contact piece. I want to do it.