JPH0422506Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a switch device, particularly a switch device in which on/off switching of equipment requiring a large current is performed by seesawing of a switch knob.

[Prior Art] In a conventional seesaw type small switch, a micro switch case is generally built into the switch case, and the switch is switched by the seesaw movement of the switch knob, which causes a presser provided on the switch knob to actuate the micro switch. is being carried out.

That is, the on/off action is performed by transmitting to the microswitch the action of rotating the switch knob through a predetermined angle through seesaw action.

[Problems to be solved by the invention] However, in the conventional seesaw type small switch device, the contact area of the contacts is small, and the contact pressure that presses between the contacts only by the stroke force due to the rotation of the switch knob is also low. It was small.

In other words, in order to obtain a large contact pressure or a large amount of displacement of the contact, a large rotation angle or a large amount of displacement of the switch knob is required.

Therefore, in conventional small switches, the current capacity of the switch itself is small, and when used in equipment that requires large currents, such as power tools, it may cause chattering when the contacts close or arcing when the contacts separate. It was happening. This caused the contacts to break, leading to switch failures.

The present invention was devised in view of the above problems, and its purpose is to provide a small switch device with a large current capacity that can be used in large current equipment without causing chattering or arcing. There is a particular thing.

[Means for Solving the Problems] In order to achieve the above object, a switch device according to the present invention includes a switch case, a fixed contact fixedly arranged in the switch case, and a fixed contact point fixedly arranged in the switch case. a movable contact located above the contact and making contact with and separating from the fixed contact; and a movable contact extending from one end fixed in the switch case, the other end holding the movable contact, and the other end being a leaf spring. a movable contact arm elastically biased upward and covering the upper part of the switch case;
A switch knob that seesaws relative to the switch case with an axis located a predetermined distance above the switch case as a rotation axis, and is slidably inserted into a tilter groove formed in the center of the switch knob with an opening facing downward. and is spring-biased downward,
a tilter whose lower end swings in accordance with the seesaw movement of the switch knob;
A guide groove portion, which is a letter-shaped groove, guides the lower end to slide and reciprocate on two slopes during the rocking movement of the lower end, and one end is rotatably provided at the lower end of the tilter. a pusher that is pivotably supported and whose other end can extend near the movable contact of the movable contact arm and come into contact with the movable contact arm; and a pusher that projects downward from the switch knob and moves as the switch knob seesaws. a push-down portion that presses a position between the one end and the other end of the switch from above, and when the switch knob is operated, the push-down portion pushes down the movable contact arm. The movable contact contacts the fixed contact.

[Function] According to the above configuration, when the switch knob is pushed and rotated, the tilting element is pushed up along the slope of the guide groove, whereby the engagement end of the pusher engaged with the tilting element (the above-mentioned one end of the presser) is pulled upward.

Furthermore, at the same time, the push-down section pushes down the movable contact side end of the pusher (the other end of the pusher) in response to the push operation of the switch knob.

By the combination of the pulling up action of the engagement end of the pusher and the pushing down action of the pusher, the pusher can be rotated through an angle larger than the rotation angle of the switch knob. A large stroke of the pusher can be obtained, and it is possible to increase the displacement amount and contact pressure of the movable contact whose contact and separation are performed by the pusher.

[Embodiment] FIG. 1 is an exploded perspective view showing each component of a preferred embodiment of the switch device according to the present invention. part 20, tilting element guide 30 as a guide groove part, and switch case 40
It consists of various parts.

The switch knob 10 is provided with a shaft hole 12 in the center of the side surface.
Rotates around 2. A protrusion 16 provided with a tilter groove 14 into which a tilter 22 and a coil spring 24 are inserted is formed at the center of the inside of the switch knob 10 .
6 is pushed down as the switch knob 10 seesaws.
8 is provided.

The tilter 22 is located in the tilter groove 1 of the switch knob 10.
4 while being biased by a coil spring 24. The dimensions of the tilter groove 14 are the same as those of the tilter 2.
2 is precisely adjusted so that it can move up and down stably without wobbling.

The coil spring 24 is inserted into the tilter groove 14 while being engaged with a coil spring receiving portion 23 provided on the tilter 22 .

A rod portion 28 is formed at the lower end of the tilter 22, and two pressers 26 are rotatably attached to the rod portion 28 from both sides. This attachment is accomplished by engaging a projection on one end of the pusher 26 with the rod 28.

A fixed contact 30 has a switch case 40 at both ends.
A terminal 34 is formed at the tip of the leg 32.

A V-shaped groove 36 is formed as a guide groove in approximately the center of the A fixed contact 30, and the lower end of the tilter 22 moves along the inner surface of the V-shaped groove 36 as the switch knob 10 seesaws. It slides.

The switch case 40 is equipped with two sets of movable contacts and a pair of B fixed contacts, and the movable contacts 42,
44 are fixed to the free ends of movable contact arms 46, 48 each having a fixed elasticity at one end.

The movable contact arms 46, 48 are connected to the movable contacts 42,
B fixed contacts 43, 4 are fixed so as to extend upward in opposite directions so as to alternately come into contact and separate as a result of the see-saw action of the switch knob 10.
5 is arranged and fixed at a position where movable contacts 42 and 44 come into contact with and separate from each other by moving up and down.

Each terminal connected to each movable contact and the B fixed contact protrudes from the bottom surface of the switch case 40. Furthermore, the bottom surface of the case 40 has terminal holes 4 through which the terminals 34a and 34b of the A fixed contact 30 protrude.
9a and 49b are provided.

As shown in the plan view of FIG. 6, the switch case is integrally formed with an insulating separation wall 41 substantially in the center of the case and perpendicular to the rotation axis of the switch knob.
Both pairs of contacts are separated. Furthermore, this separation wall 4
1 has a V groove 36 of the A fixed contact 30.
A V-shaped escape groove 41a is formed to allow the water to escape.

Next, the operation of this embodiment will be explained based on FIG.

This figure is a schematic cross-sectional view of the embodiment, showing the switch-off state, that is, the case where the switch knob 10 is not operated in a seesaw manner and is in a horizontal state.

The movable contact 44 is not in contact with the B fixed contact 45, and the other movable contact 42 and the B fixed contact 43, which are not shown for the sake of clarity, are also not in contact. The movable contact 44 is pressed against the inner surface of the A fixed contact 30 by the elasticity of the movable contact arm 48. The movable contact 42 is also in a similar state.

The tilter 22 is located in the deepest part of the V-groove 36 of the tilter guide 30 while being biased by the coil spring 24 .

FIG. 3 shows a state in which the switch knob 10 is pushed and the movable contact 44 and the fixed contact 45 are brought into contact, and the switch knob 10 is pushed in the direction of the arrow 100 and rotated about the axis 13. There is.

Due to this rotation, the tilting element 22 ascends the slope of the V-groove 36 and is pushed upward. As the tilter is pushed up, the rod portion 2 of the tilter
The support end of the presser 26 supported by 8 is pulled up.

Furthermore, the push-down portion 18 pushes down the pusher 26 toward the movable contact. The lifting operation of the support end of the presser 26 and the pressing force by the push-down portion 18 are combined, and the presser 26 is rotated with a stroke of an angle greater than the angle at which the switch knob 10 is pushed.

Furthermore, by changing the distance ₁ from the support end of the presser 26 to the pressing part shown in FIG.
It is also possible to change the stroke angle of the presser 26. That is, by reducing _{1/2 ,} the stroke angle can be increased.

In this example, two sets of the movable contact and the B fixed contact are provided in opposite directions, and the movable contact 42 and the B fixed contact 43, which are not shown in FIG.
is in a non-contact state in the state shown in FIG. These contacts 42 and 43 are brought into contact by pushing the switch knob 10 in the opposite direction, ie in the direction of arrow 102.

Therefore, the changeover switch of this example can be used as a forward/reverse switch.

FIG. 5 is a diagram showing a modification of the A fixed contact 30, in which a moderation protrusion 31 is formed on the tilting element sliding surface of the V groove 36.
It has been established.

By providing this moderation protrusion 31, when the switch knob 10 is returned from a pushed state, the lower end of the tilter 22 climbs over the moderation protrusion 31 and falls into the deepest part of the V-groove 36 at once.

This allows the switch to be turned off quickly and the contacts to separate quickly, thereby preventing the occurrence of arcs.

Furthermore, in this embodiment, the movable contacts 42 and 44
are not in contact with their respective B fixed contacts (in the state shown in Figure 2), both movable contacts are pressed against the A fixed contact 30 by the elasticity of their respective movable contact arms. However, in this state, it is possible to quickly stop the motor of the device used in this embodiment, for example, by applying electrical control as a circuit configuration that short-circuits the motor circuit of a power tool. be.

In this embodiment, the A fixed contact 30 is used as a guide groove, but it is not necessary to install such an A fixed contact. Instead, a guide groove can be formed in the insulating separation wall 41 of the switch case 40, and the tilter can be slid. The functions and effects of the present invention can also be obtained by moving the device.

[Effect of the invention] As explained above, according to the switch device according to the invention, the movable contact arm is pressed by rotating the pusher with a stroke angle that is larger than the rotation angle caused by the seesaw operation of the switch knob. By doing so, the movable contact can be brought into contact with the fixed contact with strong contact pressure, and even a small switch device can be applied to electric equipment that requires a large amount of power. It is possible to prevent chattering etc.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the embodiment, Fig. 2 is a schematic sectional view of the embodiment, Fig. 3 is a schematic sectional view showing the operation of the embodiment, Fig. 4 is a partially enlarged view of the switch knob, and Fig. 5 is a schematic sectional view of the embodiment. FIG. 6, which shows a modification of the A fixed contact, is a plan view of the switch case. 10...Switch knob, 16...Pushing part, 2
2...Tilt element, 26...Press element, 30...A fixed contact, 36...V groove, 40...Switch case,
42, 44...Movable contact, 43, 45...B fixed contact.

Claims (1)

[Claims for Utility Model Registration] (1) A switch case, a fixed contact fixedly disposed within the switch case, and a movable contact located above the fixed contact within the switch case and moving into contact with and separating from the fixed contact. a movable contact arm extending from one end fixed in the switch case, the other end holding the movable contact, and the other end biased upward with leaf spring elasticity; a switch knob that covers the upper part of the switch case and seesaws relative to the switch case with an axis located at a predetermined distance above the switch case as a rotation axis; and a tilting knob formed in the center of the switch knob with an opening facing downward. a tilter that is slidably inserted into the child groove and is biased downward by a spring, the lower end of which swings as the switch knob seesaws; a lower end of the tilter that is provided in the switch case; a substantially V-shaped groove that supports the tilter, and guides the lower end to slide and reciprocate on two slopes during the swinging movement of the lower end; and one end at the lower end of the tilter. a pusher which is rotatably supported and whose other end extends near the movable contact of the movable contact arm and is capable of contacting the movable contact arm; and a push-down part that presses a position between the one end and the other end of the pusher from above, and when the switch knob is operated, the push-down part pushes the movable contact arm. A switch device characterized in that the movable contact contacts the fixed contact by pressing down. (2) Utility Model Registration The switch device according to claim 1, characterized in that a moderation protrusion is provided on the tilting element sliding surface of the guide groove. (3) Scope of Utility Model Registration In the device described in either of claims 1 or 2, a movable contact and a fixed contact pair are mounted in opposite directions to a switch case, and there is an insulating separation between both contact pairs. 1. A switch device characterized in that a wall is formed and the guide groove portion is formed integrally with a pair of fixed contacts different from the fixed contacts.