JPH0521232Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a push switch used to open and close a power supply, etc.

[Background technology]

Conventionally, the following three-stage push switch has been used: two sets of contacts are on, only one set of contacts is on, and two sets of contacts are off. That is, a rectangular cam and a gourd-shaped cam for operating each set of contact springs are integrally provided on the same rotating shaft, and a ratchet wheel is provided on the rotating shaft, and the ratchet wheel is pushed by an operating lever to It rotates in pitch increments. 7 to 9 show the switching states of the above-mentioned push switch. In the same figure, 6'
is a rectangular cam with a rectangular center supported, 7'
is a gourd-shaped cam with a roughly disk-shaped center supported and formed into a gourd shape by forming a pair of notches at symmetrical positions; 3 is a fixed contact; 2A', 2
B' is a contact spring with contacts. Contact spring with contact 2
A' and 2B' are provided with a cam abutting protrusion 19. FIG. 7 shows the first stage switching state, in which both sets of contacts are on. FIG. 8 shows the second stage switching state, in which only the contacts on the rectangular cam side are turned on. FIG. 9 shows the third stage switching state, where both sets of contacts are off.

When the operating lever is pressed to rotate the cams 6', 7', the protruding portions of the cams 6', 7' ride over the contact springs 2A', 2B', providing an operating feel, that is, a click feeling. However, the first
As shown in FIGS. 0A to 0C, there was a problem in that there was a difference in the operating feel of each stage, and a sense of luxury could not be obtained.
FIG. 10 shows the change in operating force with respect to stroke. In particular, when switching to the first stage, as shown by point P in FIG. 10A, the peak of the cam is low and falls quickly, and the operating feel is too different compared to the second and third stages. This tendency is strong because the section modulus of the contact spring with contacts is large when the capacity is large and the spring is small.

[Purpose of invention]

The purpose of this invention is to provide a high-class push switch with three-stage switching and little difference in operating feel between the stages.

[Disclosure of invention]

The push switch of this invention has a push operation lever that has an operating claw and moves the operating claw back and forth, and a ratchet wheel that is pressed and rotated by the movement of the operating claw in one direction, and has a rectangular central portion. a rotary shaft having a supported rectangular cam and a gourd-shaped cam with a substantially disk-shaped central portion supported and shaped like a gourd by forming a pair of notches at symmetrical positions; A non-return means for restricting reverse rotation of the ratchet wheel, and a pair of contact springs with contacts that are pressed and moved toward and away from each other by being pressed by the rotation of the rectangular cam and the gourd-shaped cam, respectively, are provided. The positions of the rectangular cam and the gourd-shaped cam in the rotation direction are set so that switching between all-on, one-on, and all-off is possible with one rotation, and the rectangular cam and the gourd-shaped cam are The rear corner of each of the protruding portions in the rotational direction is characterized by protruding in an acute angle shape.

According to this configuration, the rear corner in the rotational direction of the radially outer end of each cam is made to protrude at an acute angle, so that the peak operating force occurs when the contact spring falls from the supported state by each cam and contacts the fixed contact. The value becomes higher and the timing of the fall becomes slower. Therefore, the first
The operating feel becomes stronger when the stage is switched, that is, when both sets of contacts are turned on. Therefore, the same operating feel can be obtained when switching to the first stage as when switching to the second stage, where only one is on, or when switching to the third stage, where both are off, and the difference in the operating feel at each stage becomes smaller. Note that when switching between the second stage and the third stage, the cam raises the contact spring with a contact point, so the operation feel is strong.

Embodiment An embodiment of this invention is shown in FIGS. 1 to 6. In the figure, 1 is a main body case, and two contact springs 2A and 2B with contacts are the main parts of this invention.
and another contact spring 2C with contacts are attached side by side. Each of the contact springs 2A to 2C has a cam abutting protrusion 19 formed therein. Further, three fixed contacts 3 (only one is shown) are fixed to the main body case 1, and are in elastic contact with the contact springs 2A to 2C. The two contact springs 2A and 2B are connected to each other (see FIG. 6). The two contact springs 2A and 2B have a rectangular cam 6 that is integrally provided on the rotating shaft 5 with the ratchet wheel 4 and whose rectangular center part is supported.
and a gourd-shaped cam whose substantially disk-shaped central portion is supported and formed into a gourd-like shape by forming a pair of notches at symmetrical positions, each of which is operated to separate from the fixed contact 3. The rotating shaft 5 is rotatably supported at both ends by an outer wall on one side of the main body case 1 and an intermediate support wall 8. A display plate 9 is attached to the rotating shaft 5 to indicate the on/off state. The remaining one contact spring 2C is operated to separate from the fixed contact 3 by a protruding piece 11 provided on the rotary operation arm 10.

The ratchet wheel 4 has six pawls, and is rotated by being pushed by the operating pawl 13 of the push operation lever 12. In this case, as a check means for restricting reverse rotation of the ratchet wheel 4, a separate check pawl (not shown) made of an elastic material or the like is provided. Push operation lever 1
2 is supported in such a way that it can be raised and lowered by having a through hole provided in its axial center fitted into a guide shaft 14 erected on the main body case 1, and is urged upward by a return spring 15. Further, the push-in operation lever 12 has a vertical groove 16 into which a detent/stopper 17 (FIG. 2) provided on the main body case 1 is fitted. A push button 18 is mounted on the upper end of the push operation lever 12.

The rectangular cam 6 and the gourd-shaped cam 7
These have shapes as shown in FIGS. 4A and 4B, respectively, and acute-angled protrusions 6a and 7a are provided at the rear corners of the radial outer ends in the rotational direction. The protrusions 6a and 7a are the areas indicated by diagonal lines in the same figure, and these parts are made to protrude more than the conventional ones. The dimensions and angles of each part of the cams 6 and 7 are designed as shown in the figure.

Operation By pushing down the push-in operation lever 12, the ratchet wheel 4 is rotated by one pitch (60 degrees) using the operation pawl 13 of the push-in operation lever 12. As a result, the cams 6 and 7 rotate, and the contact springs 2A and 2B come into contact with and separate from the fixed contact 3. The opening and closing of each contact is
Similar to the conventional example shown in FIGS. 7 to 9, the first stage operation turns on both contact springs 2A and 2B, and the second stage operation turns on the contact spring 2 on the rectangular cam 6 side.
Only A is turned on, and both contact springs 2A and 2B with contacts are turned off by the third stage operation.

In this case, in the second and third stage operations,
Since the contact springs 2A and 2B with contacts are raised against their elasticity by the cams 6 and 7, the operating force becomes strong, and even during the first stage operation, the operating force is strong as follows. That is, since the rear corner in the rotational direction of the radially outer end of each cam 6, 7 is made to protrude at an acute angle, the contact springs 2A, 2B with contacts fall from the supported state by each cam 6, 7, and the fixed contacts 3, the peak value of the operating force becomes high and the timing of the fall becomes delayed. Therefore, the operating feel when switching the first stage when the contact springs 2A and 2B with both contacts are turned on is strong, and becomes similar to the operating feeling when switching the second stage and the third stage. FIG. 3 shows the relationship between stroke and operating force at each stage in this embodiment. Note that the operating force for the second stage and the third stage is slightly different in the past, but in this embodiment, the operating force for each cam 6,
The operating force is matched by creating unevenness within the arc range shown by φ4.5 in Figure 7.

[Effect of idea]

The push switch of this invention has the effect of providing a luxurious operating feel with little difference between the three stages.

[Brief explanation of drawings]

Fig. 1 is a cutaway perspective view of an embodiment of this invention, Fig. 2 is a longitudinal sectional front view thereof, Fig. 3 is a cross-sectional plan view thereof, and Figs. A front view of the tongue-shaped cam, Fig. 5 is an explanatory diagram showing the relationship between the stroke of each stage and the operating force, Fig. 6 is an electric circuit diagram of its contacts, and Figs. 7 to 9 are conventional examples, respectively. FIG. 10 is an explanatory diagram showing the relationship between the stroke and the operating force. 1... Main body case, 2A to 2C... Contact spring with contact, 3... Fixed contact, 4... Ratchet wheel, 5... Rotating shaft, 6... Rectangular cam, 7... Calabash-shaped cam, 6a, 7a... protrusion, 12... push operation lever.

Claims (1)

[Scope of utility model registration request] a push-in operation lever having an operating claw and reciprocating the operating claw; and a rectangular cam having a ratchet wheel that is rotated by being pressed by movement of the operating claw in one direction, and having a supported rectangular central portion. and a rotating shaft having a gourd-shaped cam with a roughly disc-shaped central part supported and a gourd-shaped cam formed by forming a pair of notches at symmetrical positions, and a rotating shaft that allows reverse rotation of the ratchet wheel. It is equipped with a non-return means for regulating, and a pair of contact springs with contacts that are pressed and moved toward and away from each other by rotation of the rectangular cam and the gourd-shaped cam, and are fully turned on and off by one rotation of the rotating shaft. The positions of the rectangular cam and the gourd-shaped cam in the rotational direction are set so as to enable switching between one on and all off, and the rotation of each protruding part of the rectangular cam and the gourd-shaped cam is set. A push switch characterized by an acute-angled protruding corner on the rear side.