JPH0545849U - Cam control switch - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the contact piece from being deformed or broken during the reverse operation of the cam, and to quickly perform the on / off switching operation when the switch is switched. [Structure] When switching a switch consisting of three contact pieces by a cam having a changing outer diameter, the tip of the outer contact piece is made longer than the outer diameter locus of the cam step portion, and the outer contact piece is set to the cam no. It is set to slide in contact with the outer peripheral surface of the cam in one quadrant.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cam control type switch for switching a switch composed of three contact pieces by changing the outer diameter of the cam due to the rotation of the cam.

[0002]

[Prior Art]

 In this type of switch, a plurality of contact pieces are brought into contact with and separated from each other by a cam whose outer diameter is changed to switch the switch on and off. For this switching, a plurality of cam step portions are formed on the outer peripheral portion of the cam, and the contact state of the contact piece is switched at this cam step portion. If the cam is rotated in the opposite direction at the time of this switching, the contact piece abuts against the stepped portion of the cam, which causes deformation or breakage of the contact piece. Also, when some of the multiple contact pieces fall from the high position to the low position on the cam step, if the cam rotation is slow, the switch switching operation will not be performed quickly. , The on / off state becomes electrically unstable due to the occurrence of noise and chattering.

[0003]

[The purpose of the device]

 Therefore, an object of the present invention is to prevent the contact piece from being deformed or broken during the reverse operation of the cam, and to quickly perform the on / off switching operation when the switch is switched.

[0004]

[Means for solving the problem]

 In order to achieve the above object, the present invention makes the tip of the outer contact piece longer than the outer diameter locus of the cam step portion when switching the switch consisting of three contact pieces by the cam whose outer diameter changes. On the orthogonal coordinates with the longitudinal direction of the contact piece as the vertical axis and the center of the cam axis as the origin, set the outer contact piece in sliding contact with the outer peripheral surface of the cam in the first quadrant of the cam when the switch is switched. ing.

With this, even if the cam rotates in the reverse direction, the outer contact piece does not abut the slope of the cam step portion, so that the cam contact piece can be prevented from being deformed or broken. Further, since the outer contact piece slides in the first quadrant of the cam, when the switch is switched, the elastic force of the contact imparts a rotational force to the cam in a direction that accelerates the switch switching, thereby turning the switch on and off. The changeover of is quickly performed.

[0006]

【Example】

 1 to 5 show a cam control switch 1 of the present invention. The cam control switch 1 is composed of a cam 2 and two switches 3 and 4. The cam 2 has a cam surface 21 whose outer diameter changes on the outer peripheral surface, and has, for example, two cam step portions 22 and 23 in the middle thereof. One cam step portion 22 forms a slope surface from a high position to a low position by one slope surface, while the other cam step portion 23 forms a slope surface in a portion approximately half the width of the cam surface 21. In addition, the stepped portion is formed in the other half portion by the notch portion 24 while making the rotational phase different from that of the other slope.

In this way, the cam surface 21 forms four sliding contact portions A, B, C and D. The cam 2 is fitted into the shaft 8 by the central hole 9 and hits the abutting parts 91, 92 of the hole 9 at the abutting part 81 of the shaft 8 to make a play angle α of about 22 ° in terms of rotation angle. Fit together while forming.

The switches 3 and 4 are composed of three contact pieces 5, 6 and 7, both of which are fixed by a contact piece base 10. In these contact pieces 5, 6, 7 the contact piece 5 on the cam 2 side is formed shorter than the other two, but the middle contact piece 6 and the outer contact piece 7 are the contact pieces. It is set longer than 5. Further, the intermediate contact piece 6 is formed with a narrow width such as a notch so as to fall into the notch 24 of the cam step portion 23.

As shown in FIG. 1, when the shaft 8 rotates in the counterclockwise direction, the cam 2 also rotates in the counterclockwise direction due to the contact relationship between the contact portions 81 and 91. When the contact piece 5 is at the position of the sliding contact portion A, since the three contact pieces 5, 6, 7 are in contact with each other, the switches 3, 4 are all set to the ON state.

After that, as shown in FIG. 2, when the cam 2 is further rotated and the inner contact piece 5 is dropped from the cam step portion 23 at the sliding contact portion B, the intermediate contact piece 6 is also removed from the cutout portion 24. The switch 3 remains in the ON state because it falls from the portion together with the contact piece 5 and reaches the range of the sliding contact portion C. However, since the long outer contact piece 7 is in the sliding contact portion A and has not fallen from the cam step portion 23, the switch 4 is turned off.

At this time, the outer contact piece 7 is in contact with the cam surface 21 in the first quadrant on the Cartesian coordinates with the extension direction of the contact pieces 5, 6, 7 as the vertical axis and the center of the axis 8 as the origin. .. Therefore, the elastic force of the contact piece 7 causes the cam 2 to generate a rotational force in the same rotational direction prior to the counterclockwise rotational force from the shaft 8. Therefore, when the contact piece 6 falls from the cam step portion 23, the contact piece 7 rotates the cam 2 in the same direction earlier than the rotation of the shaft 8. Therefore, the contact pieces 6 and 7 are quickly turned off.

When the contact part 81 and the contact part 92 contact each other, the cam 2 stops. The rotation range of the cam 2 at this time corresponds to the play angle α. In this state, even if the user rotates the shaft 8 in the time direction, since the contact piece 7 is set to be sufficiently longer than the outer diameter locus of the cam step portion 23, the tip of the contact piece 7 is It does not hit the cam step portion 23 or the cam slope 21 and is not deformed or damaged.

Next, as shown in FIG. 3, when the outer contact piece 7 falls from the cam step portion 23 and the inner contact piece 5 is in contact with the sliding contact portion C, all the contact pieces 5, 6, Since 7 is in contact, both switches 3 and 4 are set to the ON state. Of course, at this time, since the contact piece 5 is in contact with the cam surface 21 in the fourth quadrant, the cam 2 does not receive the force in the rotating direction from the contact pieces 5, 6, and 7 and is rotated by the shaft 8 and its speed is increased. To follow.

Then, as shown in FIG. 4, at the sliding contact portion D, when the inner contact piece 5 drops from the cam step portion 22, the contact pieces 5 and 6 separate from each other, so that the switch 3 is set to the off state. To be done. However, at this time, since the contact piece 6 is not depressed and is in contact with the contact piece 7, the switch 4 remains in the ON state. Moreover, in this state, the contact pieces 6 and 7 are in contact with the cam surface 21 in the first quadrant as in FIG. 2, so that when the switch 3 is switched by the cam step portion 22, the cam 2 is Upon receiving the rotational force from 6, 7, it rotates counterclockwise, and completes the switching of the contact pieces 5, 6 from the on state to the off state.

[0015]

[Effect of the device]

 In the present invention, since the tip of the outer contact piece is set to be longer than the outer diameter locus of the cam step portion of the cam, even if the cam rotates in the opposite direction, the outer contact piece will be attached to the slope of the cam step portion. Since the tip of the contact does not hit, deformation or breakage of the contact piece can be prevented in advance, and the outer contact piece is the cam on the Cartesian coordinates when the axis is the origin and the longitudinal direction of the contact piece is the vertical axis. Since it makes sliding contact with the cam surface in the first quadrant, when the switch is switched at the cam step, a rotational force in the direction of speeding the switching is generated on the cam, so that the switching state of the switch is completed promptly and the switching is completed. There is no noise or chattering in the switching process, and stable switching operation can be expected.

[Brief description of drawings]

FIG. 1 is a front view of a state in which a contact piece is at a position of a sliding contact portion A of a cam.

FIG. 2 is a front view of a state in which the contact piece is at the position of the sliding contact portion B of the cam.

FIG. 3 is a front view of the state in which the contact piece is at the position of the sliding contact portion C of the cam.

FIG. 4 is a front view of a state in which the contact piece is at the position of the sliding contact portion D of the cam.

FIG. 5 is a plan view of a correspondence relationship between a cam step portion and an intermediate contact piece.

[Explanation of symbols]

 1 cam control switch 2 cam 3 switch 4 switch 5 contact piece 6 contact piece 7 contact piece 21 cam surface 22 cam step 23 cam step

Claims (2)

[Scope of utility model registration request] 1. A switch for switching a switch consisting of three contact pieces by a cam whose outer diameter changes, wherein the tip of the outer contact piece is set longer than the outer diameter locus of the cam step portion of the cam. Cam control switch. 2. A switch for changing over a switch consisting of three contact pieces by means of a cam having a changing outer diameter, wherein the switch is arranged on an orthogonal coordinate system with the longitudinal direction of the contact piece as the vertical axis and the center of the cam axis as the origin. A cam control switch, wherein an outer contact piece is slidably contacted with the outer circumference of the cam in the first quadrant of the cam when the switching is performed.