JPH021788Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a trigger switch that can selectively switch the switch output between forward and reverse directions.

1 and 2 show a known trigger switch. A converter 12 provided at one end of the switch case 11 rotates a rotor 13 provided inside the switch case ₁₁ to switch the switch output between forward and reverse. It is fitted into the locking parts 13 ₁ and 13 ₂ . Further, a coil spring 14 and a steel ball 15 are embedded in the converter 12 to generate switching moderation, and the steel ball 15 comes into contact with a moderation cam (not shown) provided on the inner surface of the switch case 11. ing. The rotor 13 has a pair of movable contact pieces 16,
17 is biased by springs 18 and 19, and the protruding position of these movable contact pieces 16 and 17 is restricted by a support 20. This support 20
A coil spring 21 is provided between the switch case 11 and the other end inner surface of the switch case 11, and the support body 20 and the rotor 13 are integrally urged in the direction of the converter 12 by this coil spring 21. . This rotor 13 is driven in response to the operation of an operator 22 pivotally supported on the inner surface of the switch case 11. That is,
An arm 23 is provided on the switch case 11 in parallel with the operator 22, and one end portion of a lever 24 is rotatably provided on the arm 23. The other end of this lever 24 is connected to the locking portion 1 of the rotor 13.
3 ₁ and 13 ₂ are in contact with the end faces located between each other,
The intermediate portion is in contact with the inner surface of the operator 22. When the operator 21 is pressed, the lever 24 is rotated by the operator 22, and the lever 24 causes the rotor 13 to move against the coil spring 2.
It is driven against the urging force of 1. Furthermore, as shown in FIG. 3, fixed contact pieces 25, 26, 27, 28 and a plurality of protrusions 29 are provided on the inner surface of the other end of the switch case 11, spaced apart from each other by 90 degrees. These protrusions 29 are provided so as to be able to engage with and disengage from a plurality of protrusions 30 provided on the circumferential surface of the rotor 13. Therefore, the converter 12 is as shown in FIG.
In the position shown in FIG. 2, the protrusion 30 of the rotor 13 and the protrusion 29 of the switch case 11 are engaged, and the operator 22 cannot be pressed. In this state, when the converter 12 is rotated by 45 degrees clockwise or counterclockwise, the protrusion 30 of the rotor 13 is rotated to the protrusion 2 of the switch case 11.
9 are located between each other. When the operator 21 is pressed in this state, the rotor 13 is driven by the lever 23 against the biasing force of the coil spring 21, and the pair of movable contact pieces 16, 17 are moved between the two pairs of corresponding fixed contact pieces. 25-28 were contacted,
A forward or reverse switch output can be obtained.

According to the above configuration, a predetermined function can be obtained as a trigger switch. However, in this trigger switch, switching moderation of the converter 12 is generated by a coil spring 14 provided on the converter 12, a steel ball 15, and a moderation cam provided on the inner surface of the switch case 11. Therefore, a gap is created between the converter 12 and the switch case 11 due to the structure, and dust easily enters into the switch case 11.

In addition, coil springs are often used, and
There is a problem that the number of assembly steps increases due to the large number of parts.

This idea was made based on the above circumstances,
The purpose is to provide a trigger switch whose switch case can have a dust-proof structure, and which can reduce the number of parts and the number of assembly steps.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 4 and 5, a through hole 5 is formed in one end of the switch case 51 which is formed by dividing into two.
1a is provided, and a converter 5 is provided in this through hole 51a.
2 is press-fitted. In this state, the converter 52 is held so as to be rotatable. The shaft portion 52 ₁ of this converter 52 has a D-shaped cross section,
This shaft portion 52 ₁ is inserted into a recess 53 ₁ provided in one end face of a substantially cylindrical rotor 53 provided within the switch case 51 . This recess 53 ₁
The cross section is D-shaped like the shaft portion 52 ₁ , and the depth is approximately the same as the length of the shaft portion 52 ₁ . Therefore, this rotor 53 is rotated with the rotation of the converter 52, and
The switch case 51 is movable toward one end and the other end. Further, a coil spring 54 is fitted into the shaft portion 52 ₁ of the converter 52,
The rotor 53 is biased toward the other end of the switch case 51 by the coil spring 54 . Further, projections 53 ₂ and 53 ₃ are provided on the end surface of the other end of the rotor 53.
₂ and 53 ₃ are in contact with moderation cam portions 51 ₂ and 51 ₃ provided on the inner surface of the other end of the switch case 51, respectively, as shown in FIG. Therefore, when the converter 52 is rotated, the protrusions 53 ₂ and 53 ₃ are operated according to the moderation cam portions 51 ₂ and 51 ₃ , so that switching moderation is generated. Further, the inner surface of one end of the switch case 51 and the through hole 51
As _shown in _FIG .
A second engaging portion consisting of protrusions 534 is provided on the circumferential surface of one end of the rotor 53 at a distance of 90 _° from each other as shown in FIG.

On the other hand, shafts 51 ₆ and 51 ₇ are provided on both sides of one end of the switch case 51, and these shafts 51 ₆ and
An operator 55 is rotatably provided with respect to ₅₁₇ . A lever 56 is provided inside this operator 55 . A recess 55 ₁ is formed at one end of the lever 56 on the opposing inner surface of the operator 55.
A protrusion ₅₆₁ is provided to be engaged with the rotor 53, and the other end is divided into two prongs as shown in FIG.
A protrusion 56 ₂ is provided which comes into contact with the inner edge of the protrusion 53 ₄ . Furthermore, the intermediate portion of this lever 56 is connected to an arm 5 provided on the bottom surface of the switch case 51.
1 ₈ is brought into contact with a protrusion 51 ₉ provided on the inner surface.
When the operator 55 is pressed in the direction of arrow A shown in FIG _.
The lever 56 allows the rotor 53 to be driven toward one end of the switch case 51 against the urging force of the coil spring 54.

Furthermore, on the outer surface of the other end of the rotor 53,
A pair of movable contact pieces 57, 58 are buried 180 degrees apart, and the movable contact pieces 57, 58 are urged toward the inner surface of the switch case 51 by coil springs 59, 60, respectively. Further, fixed contact pieces 61, 62, 63,
64 are provided. The fixed contact pieces 61 to 64 are constructed as shown in FIGS. 6 and 7.
That is, the fixed contact pieces 61 to 64 are spaced apart from each other by approximately 90 degrees, and among these, the fixed contact pieces 6 facing each other
1 and 63 protrude from the other fixed contact pieces 62 and 64 toward one end of the switch case 51. In this state, the adjacent fixed contact pieces 61 to
64 contact parts 61 ₁ , 61 ₂ , 62 ₁ , 62 ₂ , 63
₁ , 63 ₂ , 64 ₁ , and 64 ₂ are arranged parallel to each other along the moving direction of the rotor 53. An insulating plate 65 through which the rotor 53 passes is provided at the center of the interior of the switch case 51.

In the above configuration, the converter 52 is as shown in FIG.
When the switch case 51 is in the position shown in FIG _.
and the protrusion ₅₃₄ constituting the second engaging portion of the rotor 53 are in an engageable state as shown in FIG. Therefore, in this state, the rotor 53 cannot move, so the operator 5
It is in an off-lock state in which it is impossible to press 5. Further, in this state, the movable contact pieces 57 and 58 are in contact with only the fixed contact pieces 62 and 64, and the switch state is OFF.

On the other hand, when the converter 52 is rotated 45 degrees clockwise or counterclockwise, the protrusion 53 of the rotor 53 ₄
is the protrusion 5 of the switch case 51 as shown in FIG.
Located between 1 _{and 5} . In this state,
When the operator 55 is pressed, the lever 56 is rotated, and the rotor 53 is driven by the lever 56 against the biasing force of the coil 54 .
When the converter 52 is rotated clockwise, the fixed contact pieces 62 and 63 and the fixed contact pieces 61 and 64 are moved by the pair of movable contact pieces 57 and 58.
are electrically connected and the converter 52 is rotated counterclockwise, the movable contacts 57 and 58 bring the fixed contacts 61 and 62 and 63 and 64 into electrical continuity.
When the pressing operation force of the operator 55 is released from this state, the rotor 53 and the operator 55 are moved by the coil spring 5.
4, the switch is returned to the position shown in FIGS. 4 and 5, and in this state, the switch state is also turned off.

According to the above configuration, the protrusions 53 ₂ and 53 ₃ are provided on the end surface of the other end of the rotor 53, and the protrusions 53 ₂ and 53 ₃
Moderation cam portions 51 ₂ and 51 ₃ are provided on the inner surface of the other end of the switch case 51 to which the cams are brought into contact. Therefore, it is not necessary to provide the converter with a coil spring or a steel ball as in the conventional case, so that the converter 52 and the switch case 51 can be in close contact with each other. Moreover, since the converter 52 is press-fitted into the switch case 51, the gap between the converter 52 and the switch case 51 can be made as narrow as possible, and a dust-proof structure can be achieved.

Furthermore, movable contact pieces 57 and 58 are provided on the peripheral surface of the rotor 53, and their protruding positions are adjusted to the fixed contact pieces 62 and 6.
4 and the inner surface of the switch case 51. Therefore, there is no need for a separate support for supporting the movable contact piece as in the prior art. Moreover, as described above, since there is no need for a moderation coil spring or steel ball, the number of parts can be reduced compared to the conventional method, and the number of assembly steps can be reduced.

As described in detail above, according to this invention, it is possible to provide a trigger switch whose switch case can have a dust-proof structure, and which can reduce the number of parts and the number of assembly steps.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional trigger switch, with Figure 1 being a side sectional view and Figure 2 being a side sectional view.
The figure is a sectional view of the top, FIG. 3 is a front view showing the main parts taken out, and FIGS. 4 to 7 show an embodiment of this invention. 6 is a side sectional view, FIG. 6 is an exploded perspective view of the main parts, FIG. 7 is a front view showing the main parts taken out, and FIGS. 8 and 9 respectively show the operation of this device, and show the main parts. FIG. 51...Switch case, 52...Converter, 5
3...Rotor, 54...Coil spring, 55...Operator, 56...Lever, 57, 58...Movable contact piece, 61-64...Fixed contact piece, 51 ₂ , 51 ₃ ...
Moderation cam, 51 ₄ ... recess, 51 ₅ ... protrusion, 53
₂ , 53 ₃ ... protrusion, 53 ₄ ... protrusion.

Claims (1)

[Scope of utility model registration request] A converter is rotatably held through a through hole formed at one end of the switch case, and a first engaging member includes a recess and a protrusion formed on the inner surface of the one end of the switch case and around the through hole. a rotor that is provided inside the switch case and is rotatable by a predetermined angle by the converter and slidable inside the switch case, and the rotor is moved toward the other end of the switch case. a second engaging portion that protrudes from the circumferential surface of one end of the rotor at a predetermined angle and is capable of being engaged with and disengaged from the first engaging portion; a rotatably provided operator, one end of which is engaged with the operator, and the other end of which is engaged with the second operator;
a lever that comes into contact with a peripheral edge of the engaging portion and drives the rotor in the direction of the first engaging portion by a pressing operation of an operator; and a protrusion provided on the end surface of the other end of the rotor; a moderating cam portion provided on the inner surface of the other end of the switch case and to which the protrusion abuts; a pair of movable contact pieces provided on the circumferential surface of the other end of the rotor; and the other end of the switch case. 1. A trigger switch comprising: a fixed contact piece which is provided on the part of the trigger switch and which, when the operator is operated, the pair of movable contact pieces come into contact to generate a switch output in a forward direction or a reverse direction.