JPS645794Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel cam switch having a residual contact structure that maintains the closed or opened state after a closing or opening operation.

Hereinafter, the present invention will be described in detail based on specific embodiments shown in the accompanying drawings.

This cam switch consists of a contact contact part 1, a switching mechanism part (not shown) attached to the back side of the contact contact part 1, and an operating angle shaft 2 passing through these parts.
The operating angle shaft 2 has one end mounted on the outer wall of the casing of the switching mechanism section, a middle section mounted on the outer casing wall of the contact contact section 1 so as to be rotatable via bearings, and the other end protruded forward from the contact contact section 1. Install the handle (not shown).
In the switching mechanism, a notch cam is fixed to the operating angle shaft 2 that passes through the housing, and a spring-biased roller is brought into contact with the nottic cam, and after the operating angle shaft 2 is rotated to the closed or open position, the switch is switched to the neutral position. It is configured to automatically return to the rotational position.

Although the operating angle shaft 2 has a square outer peripheral surface in this embodiment, it goes without saying that the outer peripheral surface is not limited to this, and other square shapes are also included within the scope of the present invention.

A cam 3 is externally fitted onto an operating angle shaft 2 of the contact contact portion 1, and opens and closes the contact via a movable rod 4. Operation angle axis 2
The fitting relationship between the cam 3 and the cam 3 is such that the operating angle shaft 2 engages with the cam 3 for 45 degrees and both rotate, and the operating angle shaft 2 returns to the opposite direction for 45 degrees (the operating angle shaft 2 rotation of the chisel)
Set to allow. A control hole 5 bored in the center of the cam 3 to perform the above operation is connected to the operation angle axis 2.
The four square holes to be fitted are overlapped and bored by 45 degrees out of phase, and the fan-shaped portions formed between the apexes of the eight-pointed star and the inscribed circle are alternately deleted. The outer circumferential surface of the operating angle shaft 2 is engaged with the contour straight portion 6, and when the operating angle shaft 2 is rotated back at the contour arc portion 7,
It is set so that the outer peripheral surface rotates independently without engaging. Also, deep recesses 8, 8 are provided at opposing positions on the outer peripheral surface of the cam 3, and these recesses 8, 8
Notches 9, 9 having shallower recesses are cut in a manner that they face each other and are shifted in phase by 45 degrees. A movable rod 4 that is biased by a spring 10 and moves together with the movable contact 11 is brought into contact with the outer peripheral surface of the cam 3, and the fixed contact 12 is fixed to the casing 13 so as to face the movable contact 11. The end of the terminal is made to protrude outside the housing 13, and a terminal screw 14 is screwed thereto.

Next, the operation will be explained.

A series of operations are shown in FIGS. 3 to 6. In FIG. 3, the movable rod 4 biased by a spring 10 is fitted into the recess 8 of the cam 3, and the movable contact 11 is pressed against the fixed contact 12, so that the contact is in a closed state. The operating angle shaft 2 is set so that it can be rotated by 45 degrees to the left or right in a neutral state.
Here, when the operating angle shaft 2 is rotated to the right, the operating angle shaft 2 rotates around the linear contour portion 6 in the control hole 5 of the cam 3 and returns to its original state without engaging the cam 3. When the operating angle shaft 2 is rotated to the left, the cam 3 also rotates, and as it rotates, the movable rod 4 slips out of the recess 8 of the cam 3 and slides on the outer circumferential surface, and when it rotates 45 degrees, it enters the notch 9. Engagement cam 3
The rotation of is locked, and the movable contact 11 is fixed contact 1.
2, the contact becomes open (see Figure 4). Subsequently, when the leftward rotational force of the operating angle shaft 2 is released, the operating angle shaft 2 is rotated to the right by the operation from the switching mechanism and returns to the neutral position (see FIG. 5). Note that since the cam 3 is locked to the movable rod 4, the contacts are maintained in an open state. This fifth
The leftward rotation of the operating angle shaft 2 in the state shown in the figure returns to the neutral position without engaging the cam 3, similar to the rightward rotation in the state shown in FIG. When rotating to the right, the movable rod 4 slips out of the notch 9 of the cam 3 and slides on the outer circumferential surface and fits into the recess 8, and the movable contact 11 is moved by the spring 1.
0 and comes into contact with the fixed contact 12, and the contact becomes a closed circuit state (see FIG. 6). When the rightward rotation operation force is released, the operating angle shaft 2 is rotated to the left by the operation of the switching mechanism and returns to the neutral position, resulting in the state shown in FIG. 3, and the contacts are maintained in the closed state.

In addition, in this example, turning to the right in the figure is the contact closing position, and turning to the left is the contact opening position, but conversely, the circuit to the right is to the open position, and the circuit to the left is to the open position. It is free to set the circuit in the closed position. Further, the front and rear arrangement of the switching mechanism section and the contact contact section 1 can be changed as necessary, and the present invention also includes accommodating the switching mechanism section and the contact contact section 1 in the same housing.

The present invention can provide a cam switch having the above-mentioned configuration, which can reliably maintain the closed state or the open state of the contacts in the cam switch. In addition, a residual contact mechanism can be provided by simply fitting a cam into a conventional cam switch so that it engages with the operating angle shaft when rotating and can return freely, and by recessing a notch in the outer circumferential surface of the cam. , the invention is substantially easy to implement.

[Brief explanation of the drawing]

The drawings show a specific embodiment of the present invention, in which Fig. 1 is a front view of the contact part, Fig. 2 is an enlarged front view of the main part of the contact part, and Figs. 3 to 6 are a series of diagrams. These are front views showing the operation. Figure 3 shows the operating angle axis in the neutral position and the contact is closed, Figure 4 shows the operating angle axis rotated to the left, and Figure 5 shows the operating angle axis returning to the neutral position. FIG. 6 shows a state in which the operating angle axis is rotated to the right. 2... Operating angle axis, 3... Cam, 10... Spring,
4...movable rod, 8...recess, 9...notch.

Claims (1)

[Scope of utility model registration request] In a cam switch equipped with an operating angle shaft that automatically rotates back from a closed or open position to a neutral position, a cam is attached to the operating angle shaft, and when the operating angle shaft is rotated by a predetermined angle, the cams engage and rotate together. and configured and fitted externally to enable return movement of the operating angle shaft,
A structure of a residual contact of a cam switch, characterized in that a recess and a notch are formed on the outer peripheral surface of the cam to engage a movable rod biased by a spring.