JPH0521287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a locking device for a switch suitable for an electric shaver.

(b) Prior Art Generally, electric shavers are equipped with a locking device to prevent the switch from being accidentally turned on when the shaver is being carried in a bag or the like.

However, since the conventional locking device mechanically locks the operating panel of the switch, the structure is extremely complicated and difficult to assemble.

(c) Purpose of the Invention The purpose of the present invention is to provide a switch locking device with a simple structure.

(d) Structure of the Invention The present invention prevents the movable contact from contacting the fixed contact by interposing a lock plate between the movable contact and the fixed contact of the switch, and prevents the drive mechanism from coming into contact with the switch when unnecessary. I am trying to prevent it from activating.

(E) Embodiments Hereinafter, embodiments in which the present invention is applied to an electric shaver will be described with reference to the drawings.

FIG. 1 is a front view of a reciprocating electric shaver.

Reference numeral 1 denotes a main body case made of synthetic resin, which houses an electrical load (not shown) inside, and an outer cutter frame 2 made of die-cast aluminum is removably placed and engaged on the upper part, and an upper opening of the outer cutter frame 2 is provided. A nickel electroformed outer blade 4 is detachably attached to the blade 3 from below.

Reference numeral 5 denotes an operation plate that is pivotally housed in a rectangular recess 6 formed on the front surface of the main body case 1, and is operated by means described later, with the center line 7 indicated by a dashed line in the figure as an axis of rotation. It is considered possible to exercise.

FIG. 2 is a cross-sectional view taken along the center line 7 of FIG. 1.

Reference numerals 8 and 8 indicate pivot protrusions formed protrudingly from the center portions of both sides of the operation plate 5, and pivot portions formed from the center portions of the two mutually opposing side walls of the recess 6 to the bottom wall thereof. It is pivotally supported in the recesses 9,9.

Reference numerals 10a and 10b are projections formed on the back surface of the operation plate 5 at positions symmetrical to the center line 7, and through holes 11a and 11b bored at corresponding positions in the bottom wall of the recess 6. The main body case 1 is made to project toward the inside of the main body case 1.

12 is a printed circuit board provided inside the main body case 1 facing the inner surface of the bottom wall of the recess 6, and as shown in FIG. 3, there are two pairs of contact pattern portions arranged parallel to each other. 13, 13, 14, 14
A patterned foil is formed on the surface.

Reference numeral 15 designates an elastic conductive plate whose center is anchored to the surface of the printed circuit board 12 by an anchoring plate 17 having anchoring pins 16, 16; A circular hole 19 provided,
19, and the pins 16, 16 are inserted into both holes 1.
8, 18, 19, 19 and the head is welded. Further, the elastic conductive plate 15 has arch-shaped portions 20a and 2 on both sides of the engagement holes 19, 19.
0b, and movable contacts 21a and 21b are provided protruding from the back surface of the top of the arch. These movable contacts 21a, 21b have arch-shaped portions 20a, 20b.
is pushed by the projections 10a, 10b of the operation plate 5 and is elastically deformed, the contact pattern parts 13, 1
Fixed contacts 13a, 1 which are the ends of 3, 14, 14
Fixed contact 13 in contact with 3b, 14a, 14b
A, 13b, 14a, 14 are electrically connected. Further, both longitudinal ends 15a of the elastic conductive plate 15,
15b is in pressure contact with the substrate 11 at all times.

Figure 4 A and B are - and ' of Figure 2, respectively.
−′ cross-sectional view. The operation of the present invention will be explained based on this drawing. When the upper part of the operating plate 5 is pressed in the P direction, the operating plate 5 rotates in the direction of arrow P' about the pivot protrusions 8, 8 as the center of rotation until the upper end of the operating plate 5 comes into contact with the bottom wall of the recess 6. However, since the protrusion 10a on the upper part of the operation plate 5 similarly moves in the P' direction, the arch-shaped portion 20a is pushed by the protrusion 10a and recessed toward the substrate 12, and the movable contacts 21a and 21a move toward the substrate 12. The fixed contacts 13a and 13b are brought into contact with each other to establish electrical continuity between the fixed contacts 13a and 13b, thereby operating a drive mechanism (not shown) inside the main body case 1.

On the other hand, when the lower part of the operation plate 5 is pressed in the direction of the arrow Q, the operation plate 5 rotates in the direction of the arrow Q' until its lower end abuts the bottom wall of the recess 6, and the other protrusion 1
0b presses the other arch-shaped portion 20b to elastically deform it, brings the movable contacts 21b, 21b into contact with the fixed contacts 14a, 14b, establishes electrical continuity between the two fixed contacts 14a, 14b, and stops the drive mechanism section. .

Note that normally the operation plate 5 is connected to the elastic conductive plate 1.
The upper and lower sides are equally biased by the arch-shaped portions 20a and 20b of No. 5, and are kept parallel to the main body case 1.

Reference numeral 22 denotes a lock plate made of an insulator, which is slidably attached to a long hole 23 bored in the printed circuit board 12 in parallel with the elastic conductive plate 15, with a slide knob 24 protruding outside the main case 1. There is. The tip 22' of the lock plate 22 is inserted between the printed circuit board 12 and the arched portion 20a of the elastic conductive plate, and when the slide knob 24 is moved upward, the tip of the insulating lock plate 22' is the movable contact 21a, 21a and the fixed contact 13a, 1
3b. Therefore, even if the arch-shaped portion 20a of the elastic conductive plate is pushed by the operation plate 5, the movable contacts 21a, 21a will not be moved to the fixed contacts 13a, 21a.
13b, and therefore no energizing circuit is formed and the drive mechanism section does not move. When the slide knob 24 is moved downward, the lock plate 22 moves downward between the elastic contact plate 15 and the printed circuit board 12, and its tip 22' connects the movable contacts 21a, 21a and the fixed contacts 13a, 13b. Because it comes out from between
By pressing the operation plate 5, the movable contact 21a,
21a contacts fixed contacts 13a and 13b to energize the drive mechanism. Incidentally, reference numerals 25 and 25 are elastic pieces formed integrally with the lock plate 22. When the lock plate is moved up and down, these elastic pieces engage with a pin (not shown) on the main body side, thereby regulating the movement of the lock plate. do.

(F) Effects of the Invention The present invention does not mechanically lock the operation plate, but only requires an insulating lock plate to be interposed between the movable contact and the fixed contact, so the lock mechanism is extremely simple. Assembly becomes easier. Furthermore, if the tip of the lock plate interposed between the movable contact and the fixed contact is moved between the printed circuit board and the elastic conductive plate along the elastic conductive plate, it can be moved in the orthogonal direction as shown in FIG. The locking operation is performed reliably without the front end 22' of the locking plate coming into contact with the side edge 15' of the elastic conductive plate and preventing its movement as would be the case when the locking plate moves.

[Brief explanation of the drawing]

Fig. 1 is a front view of the electric shaver of the present invention, Fig. 2 is a sectional view of the main part taken along the center line 7 in Fig. 1, Fig. 3 is a plan view of the main part of the printed circuit board, and Fig. 4 A and B are respectively FIG. 2 is a cross-sectional view taken along the lines ``--'' in FIG. 2, FIG. 5 is an exploded perspective view of a main part, and FIG. 6 is a view for comparison with the locking device shown in the embodiment section. 5...Operation plate, 21a...Movable contact, 13a,
13b...Fixed contact, 22...Lock plate, 12...
...Printed circuit board, 20a...Arch shaped part, 15
...Elastic conductive plate.

Claims (1)

[Scope of Claims] 1. In a device in which a movable contact is pressed by an operation plate and the movable contact is brought into contact with a fixed contact to form an energizing circuit, there is no insulation between the movable contact and the fixed contact at the time of locking. 1. A locking device for a switch, characterized in that a locking plate is interposed therebetween. 2. The fixed contact is provided on a printed circuit board,
The movable contact is formed on a part of an arch-shaped elastic conductive plate mounted on the printed circuit board, and a lock plate is slidably mounted on the printed circuit board, and the tip of this lock plate is attached to the printed circuit board. 2. A locking device for a switch according to claim 1, wherein the switch is moved along the elastic conductive plate between the locking device and the elastic conductive plate.