JP2555304Y2 - Switch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a switch device having a structure in which a moving stroke of a switch substrate is made large, such as a switch for turning a trimmer of an electric shaver.

(B) Prior art As a switch device for increasing the moving stroke of a switch board, for example, as shown in FIG. 4, a switch board (12) having a bifurcated elastic leg (11) and a pair of articulating It consists of guide ribs (13) and (13). By operating the switch operation knob, the bifurcated elastic leg (11) moves between the pair of articulating guide ribs (13) and (13), Leg pieces (1
The locking projections (14) (14) provided at the end of (1) are locked at both ends of the guide ribs (13) (13) for articulation, so that the switch operation knob has a moderation. 4 (a) and (c) show the locking state of the locking projections (14) and (14).
(B) shows the articulated state.

However, in the conventional structure, since the pair of articulating guide ribs (13) and (13) are formed in parallel with each other and on a straight line, the locking projections (14) and (14) are formed of the pair of articulating guide ribs. (13) When the robot is in the middle of the movement between (13) (the state of FIG. 4 (b)), that is, this state corresponds to the state during the ON / OFF switching of the switch operation knob. Since this is continued on a straight line of the pair of articulation guide ribs (13) (13), the moderation of the switch operation is impaired.

For example, if the operation is interrupted during the switch ON / OFF operation when the above-mentioned switch device is used as the trimmer rotation switch of the electric shaver having a trimmer, the trimmer is rotated by an angle corresponding to the operation amount without completing the rotation. There was a drawback that it stopped in a moving state.

Therefore, it is conceivable that the articulation guide ribs described above are curved inward to each other, so that the bifurcated elastic leg pieces cause a larger deflection as compared with the articulation guide ribs on a straight line, thereby increasing the moderation of the switch operation. However, in this case, the upper and lower edges of the articulation guide ribs are more likely to fall outward than the articulation guide ribs on a straight line, and the protrusion provided at the lower end of the bifurcated upper elastic leg piece. There is a concern that the holding power of the resin may decrease.

Therefore, it is conceivable to increase the radius of the locking projection in order not to impair the holding force of the locking projection, but in this case, although the holding force is sufficiently obtained, the articulation is firm. There is concern that it will be.

(C) Problems to be solved by the present invention The present invention has been made in view of the above point, and in a switch device having a large stroke of a switch board, a holding force of a switch operation knob at the time of switch ON / OFF is impaired. It is another object of the present invention to provide a switch device which has a clear moderation in the articulation of the switch substrate without hardening the articulation.

(D) Means for Solving the Problems A switch board movably disposed on the inner surface side of the device case in conjunction with a switch operation knob movably disposed on the front surface of the device case, and the device case. A switch device comprising: a pair of articulating guide ribs erected on an inner surface of the switch board; and a bifurcated elastic leg piece provided at a lower end of the switch board so as to be movable between the pair of articulating guide ribs. ,
The pair of articulation guide ribs are formed to be curved inward each other, and the lower end of the bifurcated elastic leg has a rounded stepped portion on the side facing the pair of articulation guide ribs. The pair of articulating guide ribs are curved with a curvature larger than the curvature of the stepped portion, and the stepped portion is held at the tip of the rib. .

(E) Operation The present invention operates as follows.

(A) Since the guide rib for articulation is curved, the leg piece gradually bends inward when the leg piece slides on the rib, and when the leg piece gets over the curved apex portion, the restoring force of the leg piece causes The leg piece slides on the guide rib at a stretch as it tries to spread. For this reason, even if the stroke of the switch board is lengthened, the moderation of the switch operation can be made clear before and after the vertex of the curve.

(B) Further, since the locking projection provided at the lower end of the bifurcated elastic leg has a stepped portion, the operating force required at the start of the switch operation can be dispersed in a stepwise manner. It is possible to prevent the operation knob from being hardened.

(C) Furthermore, since the guide rib for articulation is curved with a curvature larger than the curvature of the stepped portion, the stepped portion can be locked at the tip of the rib.
Therefore, for example, even if an external force is applied to the operation knob against the user's intention, the locking state of the locking projection can be sufficiently maintained by the stepped portion. As a result, erroneous operation of the switch operation knob can be prevented.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a switch device using the present invention.
Is a switch up state, and (b) is a switch down state. FIG. 2 is an enlarged view of a main part of the switch device of the present invention.

(1) shows an equipment case in which the switch device of the present invention is disposed, and has a through hole (2). A switch board (3) is provided with a through hole (4) above and a bifurcated elastic leg piece (5) (5) below the switch board. Leg piece (5)
At the lower end of (5), locking projections (6) and (6) are provided. Here, the tops of the locking projections (6) (6) have stepped portions (7) (7) composed of steps with slightly different rounds. On the other hand, (8) and (8) denote a pair of switch substrate fixing ribs erected on the inner surface of the device case (1).
(9) is a pair of articulating guide ribs formed to be curved on the inner surfaces of each other.

Further, (10) and (10) are locking pieces erected on the back surface of a switch operating knob (not shown) movably arranged on the front surface of the device case, and are provided through the through hole (12). It is locked on the side wall of the through hole (4). The switch board (3) moves up and down on the inner surface of the device case (1) in conjunction with the vertical movement of a switch operation knob (not shown).
At this time, the locking projections (6) (6) provided at the lower ends of the bifurcated elastic leg pieces (5) (5) slide on the guide ribs (9) (9) for articulation.

By the way, now, when the switch operation knob is located at the top,
That is, in the state shown in FIG. 1 (a), when an external force is applied by turning the switch operation knob downward, the lower portions of the locking projections (6) and (6) are formed into gentle curved surfaces as shown in FIG. The user smoothly rides on the guide rib for articulation by operating the switch operation knob. Immediately, the stepped portions (7) and (7) of the locking projections (6) and (6) are in contact with the guide ribs (9) and (9), and here the locking projections (6) and (6).
Is held in a locked state. Therefore, even when unnecessary external force is applied to the operation knob, the operation knob is locked and held.

Further, when a larger external force is applied to the operation knob in order to ride the stepped portions (7) and (7) on the guide ribs for articulation, the stepped portions (7) are sufficiently large by the external force.
(7) rides on the guide ribs (9) and (9) for articulation, and the projections (6) and (6) provided at the lower ends of the bifurcated elastic legs (5) and (5) are mutually inward due to their elasticity. And flexes toward the articulation guide ribs (9) and (9). When an external force is further applied downward, since the pair of articulating guide ribs are curved inward each other, the distance between the locking protrusions (6) and (6) becomes the narrowest. It flexes further inward until it reaches the apex of the curve. Then, after the convex portions (6) and (6) have passed over the curved apex portion, the elasticity of the bifurcated elastic legs (5) and (5) exerts a restoring force, and the locking convex portions (6) and (6). The interval between the parentheses tries to expand to the original state, and in combination with an external force, the downward movement of the switch is completed at a stretch. Therefore, the external force required for the switch operation knob is in a direction of increasing until the locking projections (6) and (6) reach the curved apex, and are required after climbing over the curved apex. The external force is in a decreasing direction, that is, a moderation is obtained in the switch operation.

In the above description, the case where the switch operation knob is moved from the upper side to the lower side has been described. However, as shown in FIG. 3, the locking operation is performed so as to correspond to both upward and downward operations of the switch operation knob. When the stepped portions (7), (7), (7), and (7) are provided on both sides of the top of the convex portions (6) and (6), it is apparent that the same effect can be obtained in both the vertical movement operation. It is.

(G) Effect of the present invention As described above, according to the present invention, it is possible to obtain a sufficient holding force of the switch operation knob when the switch is turned ON / OFF, and at the same time to realize a smooth switch operation. It is possible to give a clear moderation. As a result, it is most suitable for a switch device that takes a large stroke of the switch substrate.

[Brief description of the drawings]

FIG. 1 is a diagram showing the principle of operation of a switch device using the present invention, FIG. 2 is an enlarged view of a main part of the switch device, FIG. 3 is a schematic view of a switch substrate showing another embodiment using the present invention, and FIG. It is an example operation principle diagram. (1) ... device case, (3) ... switch board,
(5) (5) ... bifurcated elastic leg piece, (6) (6) ... locking projection, (7) (7) (7) (7) ... stepped part,
(9) (9) ... articulation guide ribs.

Claims (1)

(57) [Scope of request for utility model registration] 1. A switch board movably disposed on an inner surface side of the device case in conjunction with a switch operation knob movably disposed on a front surface of the device case, and a switch substrate erected on an inner surface of the device case. A switch device comprising: a pair of articulating guide ribs provided; and a forked elastic leg provided at a lower end of the switch board so as to be movable between the pair of articulating guide ribs. The moving guide ribs are formed so as to be curved inward to each other, and the lower end of the bifurcated elastic leg has a rounded stepped portion on the side opposed to the pair of articulating guide ribs. Wherein the pair of articulating guide ribs are curved with a curvature larger than the curvature of the stepped portion, and the stepped portion is held at the tip of the rib.