JPH04368727A - Trigger switch - Google Patents

Abstract

PURPOSE:To provide a trigger switch which can prevent dust from invading into it and prevent occurrence of defective contact. CONSTITUTION:One end parts of a plurality of fixed terminals 19-22 composing a second switch 15 are installed in the inside of a storage part 23 and the periphery part of the storage part 23 is stuck closely to the inner face of a switch case 11. Consequently, even in the case that dust invades into the inside of the switch case 11 from the open part 11d of the switch case 11, the dust is prevented from invading into the inside of the storage part and furthermore a packing 29 being pressed to the inner face of the switch case 11 is installed in the periphery part of a rotor 24. As a result, even in the case that dust invades into the switch case 11, the packing 29 prevents the dust from invading into the storage part 23.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger switch that is applied to, for example, electric tools and is capable of changing the direction of rotation of a motor.

0002

2. Description of the Related Art Generally, a trigger switch capable of changing the direction of rotation of a motor has a trigger-shaped first operator and a second operator. The first operator is provided on a side surface of the switch case so as to be freely removable and removable;
This actuates the first switch for controlling starting and stopping of the motor. The second operator is rotatably provided on the upper surface of the switch case and operates a second switch for changing the direction of rotation of the motor. The first and second switches are provided inside a switch case. The switch case is provided with a plurality of connection ports corresponding to the first and second switches, and the first and second switches are connected by lead wires from outside the switch case through these connection ports. It is connected.

0003

By the way, trigger switches are often used in working environments with a lot of dust and the like. For this reason, dust and the like may enter the interior of the switch case, resulting in poor contact.

[0004] Therefore, dustproof measures are taken to prevent dust from entering the inside of the switch case. That is, a packing is provided around a portion of the shaft of the first operator located inside the switch case. However, since the second operator needs to rotate relative to the switch case, the switch case is provided with a large opening necessary for the rotation of the second operator. It was difficult to make the structure dustproof. Furthermore, it is difficult to make the connection port provided on the switch case dustproof, and dust etc. may enter through this connection port.
In particular, poor contact may occur in the second switch.

[0005] This invention was made to solve the problems associated with conventional trigger switches, and its purpose is to reliably prevent the intrusion of dust and the like, and to prevent the occurrence of poor contact. This is an attempt to provide a trigger switch that is capable of

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a first switch provided inside a switch case for controlling starting and stopping of electrical equipment;
a first operator that is provided on a side surface of the switch case to operate the first switch; and a second operator that is provided inside the switch case and that changes the direction of power supply to the electronic device. a switch, a second operator rotatably provided on the top surface of the switch case to operate the second switch, and a second operator provided on the side surface of the switch case corresponding to the first and second switches. and a connection port into which a lead wire for connecting the first and second switches is inserted;
a switch is housed inside the switch case,
an accommodating part that holds a plurality of fixed terminals, exposes one end of the fixed terminals, and has a periphery in close contact with the inner surface of the switch case; A rotor that is rotatably operated by an operator; a movable contact piece that is provided on the rotor and comes into contact with one end of the fixed terminal; and a movable contact piece that is provided on the peripheral edge of the rotor and is pressed into contact with the inner surface of the switch case. and an elastic member.

[0007]

[Operation] That is, the present invention arranges one end portion of a plurality of fixed terminals constituting the second switch inside the housing portion,
The peripheral edge of this housing portion is brought into close contact with the inner surface of the switch case. Therefore, even if dust enters into the switch case from the connection port of the switch case, it is possible to prevent the dust from entering into the accommodating portion.

Further, an elastic member is provided on the peripheral edge of the rotor and is pressed against the inner surface of the switch case. Therefore, even if dust enters the switch case, the elastic member can prevent the dust from entering the accommodating portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the switch case 11
A trigger-shaped first operator 12 is provided on the side surface of the controller so that it can be moved in and out. This first operator 12 is provided inside the switch case 11, and is used to start a motor (not shown).
This actuates the first switch 13 that controls the stop. A second operator 14 is provided on the upper surface of the switch case 11.
is rotatably provided. This second operator 14 is provided inside the switch case 11 and operates a second switch 15 that changes the rotational direction of a motor (not shown). That is, the second operator 14 is rotatably held by the switch case 11 at a protrusion 14a provided at an intermediate portion thereof. A protrusion 24c provided on a rotor 24 of a second switch 15, which will be described later, is engaged between the intermediate portion and one end of the second operator 14. An elastic portion 14b is provided at one end of the second operator 14, and this elastic portion 14c is pressed against a convex portion 11a provided on the upper surface of the switch case 11.

[0011] On the side surface of the switch case 11, a first
A plurality of connection ports 11b are provided corresponding to the second switch 13, and a plurality of connection ports 11b are provided corresponding to the second switch 15.
1c, and the first and second switches 13 and 15 are connected from outside of the switch case 11 by lead wires (not shown) through these connection ports 11b and 11c. FIG. 3 shows the internal structure of the switch case 11.

A coil spring 16 is provided between the end of the first operator 12 and the inner surface of the switch case 11, and is biased by the coil spring 16 in a direction to protrude from the switch case 11. A dustproof packing 17 is provided around the shaft 12a of the first operator 12. A pusher 18 is provided at the end of the first operator 12 so as to be freely removable and removable, and this pusher 18 is slidably provided on a movable contact piece 13a that constitutes the first switch 13. . This movable contact piece 13a is a common contact piece 13b.
It is rotatably held. Both ends of the movable contact piece 13a can come into contact with the fixed contact pieces 13c and 13d. The ends of the common contact piece 13b and the fixed contact pieces 13c and 13d correspond to the connection port 11b. The second switch 15 is unitized and housed in the upper part of the switch case 11.

That is, as shown in FIGS. 4 to 6, 4
The fixed terminals 19 to 22 are integrally insert molded into a substantially cylindrical housing portion 23 made of resin. Contact portions 19a~ provided at one end of the fixed terminals 19~22
22a is exposed inside the accommodating part 23, and the other end is located outside the accommodating part 23, as shown in FIG. The other end of the fixed terminals 19 to 22 has the connection port 11c.
Connecting portions 19b to 22b are provided correspondingly. When the accommodating portion 23 is accommodated in the switch case 11, the peripheral edge 23a of the accommodating portion 23 is in close contact with the upper surface of the switch case 11.

A rotor 24 is rotatably provided inside the housing portion 23. That is, this rotor 24
A protrusion 23b provided at the center of the accommodating portion 23 or a switch case 1
Recesses 24a and 24b are provided which are respectively engaged with protrusions 11e provided on the inner surface of 1. Furthermore, movable terminals 25 and 26 are provided at the center of the bottom of the rotor 24 to be contacted by the contact portions 19a to 22a of the fixed terminals 19 to 22. These movable terminals 25 and 26 are urged toward the bottom of the housing portion 23 by springs 27 and 28, respectively.

Further, a ring-shaped packing 29 is provided on the peripheral edge of the upper surface of the rotor 24, and this packing 29 is pressed against the upper surface of the switch case 11. moreover,
The protrusion 24c is provided inside the packing 29 on the upper surface of the rotor 24 at a position eccentric from the center of rotation of the rotor 24. This protrusion 24c passes through an arcuate opening 11d provided on the upper surface of the switch case 11, and its tip is engaged with the second operator 14. Therefore, by rotating the second operator 14,
The rotor 24 is rotated around the protrusion 23b and the protrusion 11e.

In the above configuration, the plurality of connection ports 11b,
The ends of the lead wires are respectively inserted into 11c, and the first and second switches 13 and 15 are connected. In this state, when the first operator 12 is pulled in, the first switch 13 is turned on. Further, when the second operator 14 is switched, the movable terminal 2 is rotated as the rotor 24 rotates.
5 and 26 and the fixed terminals 19 to 22 are switched, and the rotation direction of the motor is switched.

According to the above embodiment, the second switch 13
Contact portions 19a to 22a of fixed terminals 19 to 22 constituting
is arranged inside the housing part 23, and the peripheral edge part 2 of the housing part 23
3a is in close contact with the inner surface of the switch case 11. Therefore, since the contact portions 19a to 22a are isolated from the plurality of connection ports 11c by the storage portion 23, even if dust enters into the switch case 11 from the plurality of connection ports 11c, the dust may not enter the storage portion 23. It is possible to prevent the intrusion of

Further, a packing 29 is provided on the upper surface and peripheral edge of the rotor 24 to be in pressure contact with the inner surface of the switch case 11.
1 is provided with an arc-shaped opening 11d through which the protrusion 24b passes. Therefore, even if dust enters into the switch case 11 through the opening 11d, the packing 29 can prevent the dust from entering into the housing section 23.

Furthermore, since the second switch 15 is formed into a unit, it can be assembled simply by housing this unit inside the switch case 11, making assembly easy. Note that this invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the invention.

[0020]

As described in detail above, according to the present invention, it is possible to provide a trigger switch that can reliably prevent the intrusion of dust and the like and can prevent the occurrence of poor contact.

[Brief explanation of the drawing]

FIG. 1 is a top view showing a first embodiment of the invention.

FIG. 2 is a side view showing a first embodiment of the invention.

FIG. 3 is a side sectional view showing the main parts of FIG. 2;

FIG. 4 is a top view showing the main parts of FIG. 2;

FIG. 5 is a top view showing a portion of FIG. 4;

FIG. 6 is a side view showing a part of FIG. 4;

[Explanation of symbols]

11...Switch case, 11b, 11c...Connection port, 11
d... opening, 12... first operator, 13... first switch, 14... second operator, 15... second switch, 19
~22...Fixed terminal, 23...Accommodating part, 23a...Peripheral part, 2
4...Rotor, 24c...Protrusion, 29...Packing.

Claims (1)

[Claims] 1. A first switch provided inside a switch case for controlling starting and stopping of electrical equipment; a first switch provided in a side surface of the switch case so as to be freely removable;
a first operator for operating the first switch; a second switch provided inside the switch case for changing the direction of power supply to the electronic device; and a second switch rotatable on the upper surface of the switch case. a second operator provided on the side surface of the switch case to operate the second switch; a second operator provided on the side surface of the switch case corresponding to the first and second switches;
A trigger switch comprising a connection port into which a lead wire for connecting a second switch is inserted, wherein the second switch is housed inside the switch case and holds a plurality of fixed terminals, and an accommodating part in which one end of the fixed terminal is exposed and a periphery of the fixed terminal is in close contact with the inner surface of the switch case;
a rotor that is rotatably operated by the second operator; a movable contact piece that is provided on the rotor and comes into contact with one end of the fixed terminal; and a movable contact piece that is provided on the periphery of the rotor and that is provided on the inner surface of the switch case. A trigger switch comprising: an elastic member that is pressed into contact with the trigger switch.