JPS596578Y2 - Slide switch mechanism in small electrical equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mounting structure for a switch button of a slide switch mechanism in a small electrical device, in which an engaging protrusion formed on the switch button is fitted into a recess formed in the main body case. This is intended to suppress the tilting of the switch button as much as possible during slide operation.

In particular, this device constantly pulls the switch button toward the main body case using an elastic switch movable piece, and the engaging protrusion is shaped like an arc so that it slides linearly into engagement with the opening edge of the recess. This shape gives the engaging protrusion a centripetal action, and by regulating the sliding contact to always maintain an upright position, it prevents the switch button from tilting and reduces the force required to slide the switch button. Further, the switch button having the engaging protrusion can have a certain size tolerance relaxed.

Generally, in small electrical devices with this type of switch mechanism, the switch button is restricted by a mounting hole in the main body case into which the boss part of the switch button is inserted to suppress the tilting of the switch button during slide operation. However, if the switch button is large, the mounting hole in the main body case must also be made large, which not only poses problems with the strength of the main body case, but also requires strict dimensional accuracy of the mounting hole in the boss part to suppress tilting. Moreover, stopping the tilting, that is, minimizing the fitting dimension, has the contradictory drawbacks of increasing the sliding resistance between the boss and the mounting hole, which increases the operating force. However, there are various restrictions regarding its structure and manufacturing.

The present invention has been devised in view of the above circumstances, and embodiments of the slide switch mechanism according to the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a large arc-shaped plate-shaped switch button with an engaging boss portion 2 protruding from its inner surface; 3, a main body case on which the switch button 1 is slidably attached to the outer peripheral surface; and 4, the boss portion 2 is fitted into the main body case. A rectangular mounting hole allows the switch button 1 to slide freely in the circumferential direction, 5 is a switch movable piece connected to the boss portion 2, 6 is a slide terminal connected to the switch movable piece 5, and a fixed contact 7 , 8 constitute a switch contact mechanism 9.

Of course, the switch movable piece 5 and the slide terminal 6 may be integrally formed.

The switch contact mechanism 9 is configured to turn off current to the fixed contact pieces 7 and 8 through the sliding operation of the switch button 1.

FIG. 2 is an exploded perspective view showing an example in which the above-mentioned switch mechanism is applied to an electric shaver.The outer peripheral surface of the cylindrical main body case 3 with the outer cutter body 10 mounted on the upper part has an arc-shaped plate-shaped switch button. A recess 11 is formed into which the switch button 1 is slidably inserted in the circumferential direction (in the direction of arrow a), and approximately at the center of this recess 11 is a mounting hole through which the retaining boss portion 2 of the switch button 1 is inserted. 4 is in full form.

An engagement protrusion 12 having a semi-cylindrical arcuate surface 24 is provided on the inner surface of the switch button 1 so as to extend in the sliding direction (direction of arrow a) across the engagement boss 2. The case 3 has a recessed part 13 extending in the circumferential direction (direction of arrow a) with which the engaging protrusion 12 is slidably engaged so as to straddle the mounting hole 4 .

14 and 15 are protruding ribs formed above and below the mounting hole 4 of the main body case 3 in order to make the switch button 1 slide smoothly.

The recessed portion 13 may be shaped like a guide hole, for example, passing through the inner and outer surfaces of the main body case 3.

The movable piece 5 is formed in the shape of a cylindrical piece, and has a T-shaped locking elongated hole 16 in the center of its upper part. Engagement protrusions 19 and 20 protruding from both sides of the boss portion 2 are engaged and coupled to the switch button 1 as shown in FIG. 1.

The upper part of this movable piece 5 has spring members 21 and 22 on both sides thereof.
is provided in a protruding manner and is pressed against the inner peripheral surface of the main body case 3 with spring properties, as shown in FIG.

Therefore, the switch button 1 is always urged toward the main body case 3 by the spring properties of the movable piece 5.

To explain the assembly work of the above structure, first insert the engaging boss part 2 of the switch button 1 into the mounting hole 4 of the main body case 3 as shown by arrow b in FIG. 1
2 is engaged with the recessed part 13, and the inner circumferential surface of the switch button 1 is held in pressure contact with the outer circumferential surface of the main body case 3.

Next, when the movable piece 5 is inserted into the case from the lower end opening of the main body case 3 in the direction of arrow C, the retaining boss portion 2 of the switch button 1 protruding into the case 3 will be aligned with the engagement length of the movable piece 5. It is inserted into the hole 16, and the engaging protrusions 19 and 20 of the boss part 2 are engaged with the both side edges 17 and 18 of the retaining elongated hole 16, and the switch button 1 and the movable piece 5 are connected as shown in FIG. The combination is made.

Therefore, the engaging protrusion 12 having the arcuate surface 24 engages with the upper and lower opening edges 25 of the recessed part 13 having a rectangular cross section in a linear sliding manner. The switch button 1 is always held in the main body case 3 by the spring members 21 and 22.
The width direction center line C of the boss portion 2 is in vertical sliding contact position A, B between the opening edge portion 25 and the circular arc surface 24 of the engagement protrusion 12, respectively. It is set equidistant from the

Therefore, even if the switch button 1 is biased with respect to the main body case 3, the boss portion 2 receives the tensile force from the movable piece 5, and the circular arc surface 24 of the engaging protrusion 12 moves along the imaginable axis P of the circular arc surface 24. Slide on the opening edge 25 centering on the switch button 1.
The aim is to automatically correct the trajectory so that it is in its normal position, that is, parallel to the main body case 3.

That is, a centripetal force is constantly acting on the boss portion 2 in the direction of the arrow Y in FIG. It is.

It goes without saying that the protrusion 12 may be formed on the outer peripheral surface of the case 3, and the recessed portion 13 may be formed on the inner peripheral surface of the switch button 1.

In addition, the ribs 14 and 15 provided on the main body case 3 make the switch button 1 float above the surface of the main body case 3 and reduce the side sliding force, thereby making it easier to exert the above-mentioned centripetal action. It's not a thing.

As described above, according to this invention, even if the user operates the switch button in a direction that is biased from the normal sliding direction, the switch button 1
The boss portion 2 of the switch button 1 is always held by the centripetal action generated by the urging force that pulls the button toward the main body case 3 side and the line contact between the engaging protrusion 12 having the circular arc surface 24 and the opening edge 25 of the recessed portion 13. It is possible to correct the sliding direction to the normal sliding direction, thereby preventing tilting and preventing contact loss and unstable contact of the switch contact mechanism.

Moreover, according to this invention, the switch button 1 does not need to have its direction restricted by the boss part 2 and the mounting hole 4 through which the boss part 2 passes, as in the conventional case. This provides excellent effects such as saving management and reducing operating force.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the switch mechanism according to the invention, FIG. 2 is an exploded perspective view showing an example of the switch mechanism applied to an electric shaver, and FIG. 3 is a sectional view of the main parts. 1...Switch button, 2...Engagement boss part, 3...Body case, 4...Mounting hole,
5...Movable piece, 9...Switch contact mechanism, 12...Engaging protrusion, 13...Recessed part, 24... Arc surface, 25...Opening edge, a...Sliding direction, A, B...
Sliding contact position, C... Center line in the width direction of the boss part.

Claims (1)

[Scope of utility model registration request] A movable switch whose boss portion 2 formed on the inner surface of the switch button 1 is slidably fitted into the mounting hole 4 of the main body case 3, and which is connected to the switch contact mechanism 9 when the switch button 1 is slid. In a slide switch mechanism for a small electric device in which the piece 5 is configured to slide and deviate, the switch movable piece 5 having elasticity is attached to the boss portion 2, and the switch button 1 is always drawn toward the main body case 3, In addition, it is possible to straddle the mounting hole 4 or the boss portion 2 on one of the facing surfaces of the main body case 3 and the switch button 1 in the sliding direction a.
A recessed portion 13 is formed extending into the recessed portion 13, and an engaging surface 24 having an arcuate cross section that linearly slides and engages the two upper and lower opening edges 25 of the recessed portion 13 is formed on the other opposing surface. The mating protrusion 12 is shaped, and the width direction center line C of the boss part 2 is set from the vertical sliding contact positions A and H of the opening edge 25 and the arcuate cross-sectional surface 24 of the engagement protrusion 12, respectively. A slide switch mechanism for a small electrical device characterized by being set at equidistant positions.