JPS6137151Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pull switch with a simple structure.

Generally, in a pull switch, various parts are assembled inside the switch main body case. For example, a ratchet pawl, an articulating member that engages with the ratchet pawl and rotates articulately, an elastic member that presses the articulating member against the ratchet pawl, a connecting terminal led out from the inside of the case to the outside, external traction. These include a contact piece that rotates in a certain direction when operated to drive the articulation member and returns to contact the connection terminal, and an elastic member that biases the contact piece in the return direction.

Since many parts are incorporated into the case, the structure becomes complicated and large, and the number of assembly steps is large, resulting in high cost.

The present invention has been devised to eliminate these drawbacks, and aims to provide a pull switch that can be simplified in structure, downsized, and reduced in assembly steps to reduce costs.

Hereinafter, details of the present invention will be explained based on illustrated embodiments. Figure 1 is a plan view of the pull switch, Figure 2 is a vertical sectional view, and Figure 3 is an exploded perspective view of the main parts. The members include a contact piece 4 and a compression coil spring 5.

A through hole 6 is provided in the inner bottom surface of the switch body case 1.
and a strut 7 are provided adjacent to each other, and a ratchet pawl 8 is integrally formed around them. Also,
On both sides of the ratchet pawl 8, a pair of contact terminals 9a and 9b are provided which lead out from the inner bottom surface of the case 1 to the outside of the case.
is fixed.

The terminal member 2 is made of a conductive metal plate, and has a terminal portion 10 at one end, a bent spring receiver 11 at the other end, and a cylindrical portion 12 at the intermediate portion.
The terminal portion 10 is projected from the inside of the case 1 through the through hole 6 to the outside of the case. Further, the cylindrical portion 12 is fitted onto the outer periphery of the support column 7, so that the terminal member 2 is stably supported within the case 1.

The articulated member 3 is also made of a conductive metal plate, and is rotatably mounted on the outer periphery of the cylindrical portion of the terminal member 2. On the peripheral edge of the articulated member 3, a plurality of inclined pieces 13 protruding to the lower surface side and a plurality of engaging claws 14 protruding to the upper surface side are alternately arranged in the same number (in the figure, four
The articulated member 3 engages the inclined piece 13 with the ratchet pawl 8 to articulately rotate in a fixed direction.

The contact piece 4 is an elongated member made of a conductive metal plate, and its middle portion is rotatably supported by the cylindrical portion 12 on the upper surface side of the articulation member 3. It has an engaging protrusion 15 around its rotation center that engages with the engaging claw 14 of the articulated member 3, and a drawstring 16 is connected to one end.
is derived outside of case 1. Further, the rotation range of the contact piece 4 is limited by the inner wall of the case 1, and when the drawstring 16 is pulled outside the case 1, it rotates in a certain direction (clockwise in the figure), and at that time, the The articulation member 3 is driven in the same direction at a constant angle. Then, the return operation is performed to bring both ends into contact with the pair of connection terminals 9a and 9b.

The compression coil spring 5 is disposed on the outer periphery of the cylindrical portion 12 and is interposed between the spring receiver 11 and the contact piece 4 in a slightly compressed state, so that the compression coil spring 5 connects the articulated member 3 via the contact piece 4. The ratchet pawl 8 presses elastically. Moreover, one end is stretched over the inner wall of the case 1, and the other end is stretched over a bent portion 16 formed on the contact piece 4, so that the contact piece 4 is biased in the return direction.

With the above configuration, when assembling this pull switch, first attach the coil spring 5, contact piece 4, and articulation member 3 to the outer periphery of the cylindrical portion 12 of the terminal member 2 in order from the terminal portion 10 side. After mounting, insert the terminal portion 10 into the through hole 6 from the inside of the case 1.
After inserting it inside, screw the terminal part 10 and fix it.
The drawstring 16 tied to one end of the contact piece 4 is guided out of the case 1 to complete the assembly. In this state, the terminal member 2 is stably supported within the case 1 without tilting by fitting the cylindrical portion 12 into the support 7 formed integrally with the case 1. , joint member 3, contact piece 4,
The coil spring 5 and the like are supported by the terminal member 2.

Therefore, according to this pull switch, the ratchet pawl 8 and the support column 7 are integrally formed with the case 1, and the terminal member 2 has the terminal portion 10, the spring receiver 11,
By integrally forming the cylindrical portion 12, the number of parts can be reduced and assembly can be performed in a short time. Furthermore, since the common spring 5 is used to press the joint member 3 against the ratchet pawl 8 and to bias the contact piece 4 in the return direction, the number of parts can be reduced and the configuration simplified. , miniaturization is being attempted.

In addition, a support 7 is attached to the inner bottom of the switch body case 1.
By providing this, it is possible to prevent the terminal member 2 from tilting, and the switch operation becomes smooth.

As detailed above, according to the present invention, the switch operation is smoothed, the configuration is simplified, and the size is reduced.
It is possible to provide a pull switch that can reduce the number of assembly steps and realize cost reduction.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a longitudinal sectional view of the same embodiment, and FIG. 3 is an exploded perspective view showing the main parts of the same embodiment. 1...Switch body case, 2...Terminal member,
3... Joint member, 4... Contact piece, 5... Compression coil spring, 6... Through hole, 7... Support column, 8... Ratchet claw, 9a, 9b... Contact terminal, 10... Terminal part , 11... Spring receiver, 12... Cylindrical portion.

Claims (1)

[Scope of utility model registration request] The switch has a main body case, a through hole provided in the inner bottom surface of the case, a terminal part at one end, a spring receiver at the other end, and a cylindrical part in the middle part. a terminal member protruding outward from the hole; a ratchet pawl integrally formed on the inner bottom surface of the case and positioned around the cylindrical portion; and a ratchet claw integrally protruding from the inner bottom surface of the case into the cylindrical portion a column that supports the terminal member; an articulation member that is rotatably attached to the outer periphery of the cylindrical portion and engages with the ratchet pawl to articulately rotate in a fixed direction; A connection terminal led out to the cylindrical portion is attached to the outer periphery of the cylindrical portion so as to be rotatable within a certain range, and when the articulated member is rotated in a certain direction by an external pulling operation, the articulated member is driven by a certain angle, and the return operation is performed to A contact piece that contacts the connection terminal and the spring receiver disposed on the outer periphery of the cylindrical portion of the terminal member are interposed between the contact piece and the articulated member is pushed to the ratchet pawl via the contact piece. 1. A pull switch comprising: a compression coil spring that biases the contact piece in the return direction.