JPS6125144Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a seesaw-type micro-switch opening/closing mechanism in which micro-switches are arranged on both sides of a switch operating shaft and the micro-switch is opened and closed by a seesaw-shaped operating rod.

The conventional seesaw-type micro switch opening/closing mechanism is disclosed in Japanese Utility Model Publication No. 54-10524.The center of the seesaw-shaped operating rod is placed on the upper cutout surface of the switch operating shaft, and it is crimped with a spring. were usually small. Its operation is achieved by rotating the switch operating shaft, the operating rod rotates, and its end comes into contact with one of the microswitches, and by further rotating the switch operating shaft, the operating rod is placed in the cutout surface of the switch operating shaft. Using one end as a fulcrum, move it away from the notch surface, apply a spring,
This generates operating contact pressure on the micro switch. In this conventional type, the fulcrum is made at the outer peripheral end of the operating shaft, so the moment arm that generates contact pressure by the spring is only the distance between the center of action of the spring, that is, the center of the operating shaft, and the end of the operating shaft, that is, approximately the diameter of the operating shaft. Therefore, there was a drawback that sufficient contact pressure for stable operation of the microswitch could not be obtained. Furthermore, since the operating rod cannot be pushed in far enough from when it comes into contact with the microswitch, it is not possible to secure the contact depth for stable operation of the switch, resulting in a lack of stability in opening and closing. Furthermore, increasing the diameter of the operating shaft by several times increases the size of the opening/closing mechanism and increases costs, so this has not been a practical solution.

The present invention aims to provide a seesaw-type microswitch opening/closing mechanism that skillfully eliminates these drawbacks through simple structural improvements.

In the present invention, micro switches 2 and 2' are arranged on both sides of a switch operation shaft 1, the upper part of the switch operation shaft is cut out, and a screw 4 is installed in the center of the notch so as to protrude vertically. Insert the washer 6 wider than the operating shaft diameter, the spacer 5, and the spring seat 8 in order from the bottom, and fasten the washer 6, spacer 5, and spring seat 8 to the switch operating shaft 1 using the screws. In addition, the actuating rod 9 of the seesaw-shaped micro switches 2, 2' extending long on both sides is loosely fitted into the spacer 5 above the washer 6, and the spring 10 is fitted between the actuating rod 9 and the spring seat 8. This relates to a seesaw-type micro switch opening/closing mechanism with a

In the figure, 11 is the foot petal that rotates the switch operating shaft 1, 12 is the latch mechanism of the switch operating shaft 1, 13 is the contact point with the micro switch at the tip of the operating rod 9, and 14 is the contact point between the washer 6 and the inclined operating rod 9. It is a point of contact.

In this invention, when the switch operating shaft 1 is in a neutral state, the operating rod 9 is in a horizontal state and is not in contact with any of the micro switches 2. Next, when the switch operating shaft 1 is rotated in one direction, the operating rod 9 rotates along with the rotation, and finally the tip of the operating rod 9 on the lifted side comes into contact with one of the microswitches. If the switch operating shaft 1 is further rotated from this state, its contact point 13 will hardly move and the operating rod 9 will come into contact only at the washer end (contact point 14) on the microswitch side. Therefore, the center part of the operating rod 9 is separated from the cutout surface 3, and the spring 10 is compressed to generate a moment in the operating rod 9, but the arm is connected between the center of the switch operating shaft 1 and the contact point 14 at the end of the washer 6. The distance is considerably larger than the switch operation shaft diameter 1, and can be sufficiently taken to be several times larger than the switch operating shaft diameter 1. Therefore, the moment is sufficiently high, and the contact force of the operating rod 9 against the microswitch 2 becomes dramatically large.

As described above, according to the present invention, a wide washer is placed between the operating rod 9 and the notch surface 3 of the switch operating shaft 1 using the spacer 5.
By simply adding a simple structure of fixing the micro switch 2 to the
Moreover, it has a highly practical effect of being extremely inexpensive. Furthermore, since the width of the washer 6 is long, even if the switch operating shaft 1 is rotated by a small angle of about 2° to 3° after the operating rod 9 contacts the micro switch, the movement (pushing distance) of the operating rod 9 can be made large. This has the effect that a sufficient contact depth can be ensured and the switch can operate stably.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the seesaw type microswitch opening/closing mechanism of the present invention, FIG. 2 is a vertical sectional view taken along the line shown in FIG. FIG. 4 is a longitudinal sectional view taken along the line of FIG. 1, and FIG. 5 is an explanatory diagram showing the operation of this embodiment. 1: Switch operation shaft, 2, 2': Micro switch, 3: Notch surface, 4: Screw, 5: Spacer,
6: Washer, 7: Screw head, 8: Spring catch,
9: Operating rod, 10: Spring.

Claims (1)

[Scope of utility model registration request] Micro switches 2 and 2' are arranged on both sides of the switch operation shaft 1.The upper part of the switch operation shaft is cut out, and a screw 4 is installed in the center of the notch so that it protrudes vertically. Insert the wider washer 6, spacer 5, and spring seat 8 in order from below, and tighten the washer 6, spacer 5, and spring seat 8 to the switch operating shaft 1 with the same screws, and The actuating rod 9 of the seesaw-shaped micro switches 2, 2' extending long on both sides is loosely fitted into the spacer 5 above the washer 6, and the spring 10 is fitted between the actuating rod 9 and the spring seat 8.
Seesaw type micro switch opening/closing mechanism with