JPH0541475Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] This invention relates to a trigger switch used, for example, in a power tool.

[Technical background of the invention and its problems]

As is well known, some small electric tools such as hand drills are recently driven by direct current using batteries.
In trigger switches applied to such DC-driven power tools, if the operating speed of the trigger operator is slow, a large amount of arcing will occur between the contacts.
Sometimes there is a problem in that the contacts become welded together and cannot be opened.

In addition, in this type of trigger switch, one has been considered that generates moderation at the time of switching operation to make the interval between switching operations clear, but conventional switching moderation does not correspond to the on and off of the switch, There was a problem in that it caused a feeling of discomfort during operation.

[Purpose of invention]

This invention was made based on the above circumstances, and its purpose is to create a trigger switch that can reduce the occurrence of arcing and also achieve moderation that matches the on and off states of the switch. This is what we are trying to provide.

[Summary of the idea]

This idea includes a lever that is reversely operated by the action of a spring in response to the operation of a trigger operator, for example, and this lever operates a rotor equipped with a movable contact piece at high speed, thereby reducing the occurrence of arcs and improving the It was designed to give a sense of moderation.

[Example of idea]

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

In FIGS. 1 and 2, a through hole 1 is provided in one end surface of the switch case 11 which is formed by dividing into two parts.
1a is provided, and a converter 1 is provided in this through hole 11a.
2 is press-fitted. In this state, the converter 12 is held so as to be rotatable. The shaft portion 12 ₁ of this converter 12 has a D-shaped cross section,
This shaft portion 12 ₁ is inserted into a recess 13 ₁ provided in one end face of a substantially cylindrical rotor 13 provided within the switch case 11 . This recess 13 ₁
The cross section is D-shaped like the shaft portion 12 ₁ , and the depth is approximately equal to the length of the shaft portion 12 ₁ . Therefore, this rotor 13 is rotated with the rotation of the converter 12, and
The switch case 11 is movable toward one end and the other end. Furthermore, projections 13 ₂ and 13 ₃ are provided on the end surface of the other end of the rotor 13, and these projections 13 ₂ and 13 ₃ are provided on the inner surface of the other end of the switch case 11, respectively, as shown in FIG. The moderation cam portions 11 ₂ and 11 ₃ are brought into contact with each other.
Therefore, when the converter 12 is rotated, the protrusions 13 ₂ and 13 ₃ are operated according to the moderation cam portions 11 ₂ and 11 ₃ , so that switching moderation is generated. Further, as shown in FIG. 3, on the inner surface of one end of the switch case 11 and around the through hole 11a, there are a recess 11 ₄ and a protrusion 1 at a distance of 90° from each other.
A first engaging portion consisting of 1 ₅ is provided on the circumferential surface of one end of the rotor 13 at a 90° angle as shown in FIG.
Second engaging portions consisting of protrusions 13 ₄ are provided spaced apart from each other.

On the other hand, shafts 11 ₆ and 11 ₇ are provided on both sides of one end of the switch case 11, as shown in FIG. 1, and an operator 15 is provided rotatably with respect to the shafts 11 ₆ and 11 ₇ . A lever 16 is provided inside a housing portion 11b integrally formed with the operator 15 and the switch case 11. This lever 1
6, as shown in FIG. 3, parallel legs 16 ₁ , 1
6 ₂ Connecting part 1 that connects these leg parts 16 ₁ and 16 ₂
6 ₂ , an engaging portion 16 ₄ provided on this connecting portion 16 ₃ ,
16 ₅ , and the legs 16 ₁ , 16
At one end of ₂ , there is a pin 1 that is passed through the storage portion 11b.
7 is penetrated. Furthermore, the engaging portion 16 ₄ is located within a groove portion 13 ₅ provided along the protrusion 13 ₄ of the rotor 13 . Furthermore, a mover 18 is provided between the leg portions 16 ₁ and 16 ₂ . The pin 17 is attached to one end of the movable element 18.
is penetrated, and this mover 18 has legs 16 ₁ , 16 ₂
It is said that it can be rotated freely between the two. Further, the other end of this movable element 18 and the engaging portion 16 of the lever 16
A coil spring 19 is provided between the coil spring ₅ and the coil spring 19.
A coil spring 20 is provided between the intermediate portion of the movable element 18 and the inner surface of the storage portion 11b. Therefore, the movable element 18 is always urged in the direction of the arrow _A shown in FIG.
biased in the direction. Therefore, the rotor 13 is always urged toward the other end of the switch case 11.

On the other hand, the outer surface of the other end of the rotor 13 has a 180°
A pair of movable contact pieces 27 and 28 are buried apart from each other,
These movable contact pieces 27 and 28 each have a coil spring 2.
9 and 30 toward the inner surface of the switch case 11. In addition, the switch case 1
Fixed contact pieces 21, 22, 23, 24 are provided at the other end of 1.
will be provided. These fixed contact pieces 21 to 24 are the third
The configuration is as shown in FIGS. That is, the fixed contact pieces 21 to 24 are spaced apart from each other by approximately 90 degrees, and among these, the fixed contact pieces 21, 24 that face each other
23 projects from the other fixed contact pieces 22 and 24 toward one end of the switch case 11. In this state, the contact portions 21 ₁ , 21 2 , 22 ₁ , 22 _{2 ,} 23 ₁ , 23 of the adjacent fixed contact pieces 21 to 24
₂ , 24 ₁ , and 24 ₂ are arranged parallel to each other along the moving direction of the rotor 13 . Incidentally, an insulating plate 25 through which the rotor 13 passes is provided at the center of the interior of the switch case 11.

In the above configuration, the converter 12 is as shown in FIG.
When the switch case 11 is in the neutral position shown in FIG.
1 ₅ and the protrusion 13 ₄ constituting the second engaging portion of the rotor 13 are in an engageable state as shown in FIG. Therefore, in this state, the rotor 13 cannot be moved. In this state, the movable contact pieces 27 and 28 are in contact with only the fixed contact pieces 22 and 24, and the switch state is OFF.

On the other hand, when the converter 12 is rotated 45° clockwise or counterclockwise, the protrusion 13 ₄ of the rotor 13
is the protrusion 1 of the switch case 11 as shown in FIG.
Located between 1 _{and 5} . In this state,
When the operator 15 is pressed, the movable element 18 is rotated in the direction of arrow B shown in FIG. 2 against the urging force of the springs 19 and 20. And mover 1
When the other end (rotating tip) of the lever 16 passes over the engaging portion ₁₆₅ of the lever 16, the lever 16 is instantaneously rotated in the direction of arrow A in the figure by the action of the spring 19. At this time, the engaging portion ₁₆₄ of the lever 16 and the rotor 13
Since the rotor 13 is opposed to the protrusion 13 ₄ , the rotor 13 is moved toward one end of the switch case 11 as the lever 16 rotates. Therefore, when the converter 12 is rotated clockwise, the fixed contact pieces 22 and 23 and the fixed contact pieces 21 and 24 are electrically connected by the pair of movable contact pieces 27 and 28, and the converter 12 is rotated counterclockwise, the fixed contact piece 2 is moved by the movable contact pieces 27 and 28.
1 and 22 and 23 and 24 are electrically connected. When the pressing force of the operator 15 is released in this state,
When the movable element 18 is rotated in the direction of arrow A shown in _FIG .
9, the lever 16 is instantaneously rotated in the direction of arrow B in the figure. Therefore, the rotor 13 is returned to the position shown in FIGS. 1 and 2, and is turned off.

According to the above embodiment, the lever 16 that drives the rotor 13 is instantaneously rotated by the action of the spring 19, which is reversed in response to the operation of the operator 15, thereby driving the rotor 13 at a high speed. Therefore, the speed of contact and separation between the movable contact pieces 27, 28 provided on the rotor 13 and the fixed contact pieces 22, 24 and 21, 23 can be increased. It is possible to reduce the occurrence of arcs.

In addition, when the lever 16 is reversed in response to the operation of the operator 15, moderation occurs when the lever 16 passes through a dead point, and at the same time, the switch state is changed, which makes it difficult to use. There is no feeling and a good operating feeling can be obtained.

Furthermore, the springs 19 and 20 are connected to the fixed contact pieces 21 to 24.
Since the spring 1 is housed inside the storage part 11b away from the spring 1, even if an arc occurs, the spring 1
9 and 20 can be prevented from deteriorating.

Furthermore, since one end of the movable element 18 is rotatably held at one end of the lever 16, the installation space for these parts can be reduced, and the entire trigger switch can be made smaller. .

Furthermore, between the other end of the movable element 18 and the other end of the lever 16, and between the intermediate part of the movable element 18 and the storage section 11,
Since the springs 19 and 20 are provided between the inner surfaces of b, the space for arranging these can be reduced.

Further, this trigger switch is safe in operation because the switch state will not be turned on even if the operator 15 is operated unless the converter 12 is first rotated.

[Effect of idea]

As described in detail above, according to this invention, it is possible to reduce the occurrence of arcs, obtain moderation that matches the on and off states of the switch, and furthermore, when arcs occur, the elastic member deteriorates. Therefore, it is possible to provide a trigger switch that can prevent this and can be made smaller as a whole.

[Brief explanation of the drawing]

The drawings show an embodiment of the trigger switch according to this invention, and FIG. 1 is a top sectional view;
Figure 2 is a side sectional view, Figure 3 is an exploded perspective view of the main parts,
FIG. 4 is a front view showing the main parts, and FIGS. 5 and 6 are rear views showing the main parts, respectively, showing the operation of this invention. 11... Switch case, 12... Converter, 1
3... Rotor, 15... Operator, 16... Lever, 16 ₁ , 16 ₂ ... Leg portion, 16 ₄ , 16 ₅ ... Engaging portion, 18... Mover, 19, 20... Spring, 2
1 to 24... fixed contact piece, 27, 28... movable contact piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotor that can slide inside a switch case, a movable contact piece provided on the rotor, and a movable contact piece provided inside the switch case that moves the movable contact piece as the rotor moves. a fixed contact piece that moves toward and away from the rotor; a storage section provided in the switch case in a direction orthogonal to the sliding direction of the rotor; and a storage section provided in the switch case located near the storage section parallel to the sliding direction of the rotor. a lever that is rotatably held at one end in the housing and that is engageable with the rotor and that drives the rotor; , one end of which is rotatably held at one end of the lever, and first and second parts provided between the other end and the other end of the lever, and between the intermediate part and the inner surface of the storage section, respectively. a movable element that is brought into contact with the inner surface of the operating element by an elastic member, is rotated in a direction overlapping with the lever in accordance with the operation of the operating element, and in the middle of this rotation, the lever is reversely operated by the action of the elastic member; A trigger switch characterized by being equipped with.