JPH06111658A - Clamp structure of switch - Google Patents

Abstract

PURPOSE:To attach and detach a knob freely, and reduce a manufacturing cost of a clamp member. CONSTITUTION:A side surface of a shaft part 12 of a knob 10 is formed with a loose-out preventing projecting part 12A, and a clamp member 16 is made of plastic plate. This clamp member 16 is formed with an opening 16A having the nearly the same shape with the cross section of the shaft part 12, and formed with two notches 16C, which form one elastic piece 16B, from the opening 16A, and this clamp member 16 is pushed in for fitting to the shaft part 12 over the projecting part 12A of the shaft part 12. The shaft part 12 holding force by the elastic piece 16B formed in the clamp member 16 is smaller than that of a metal piece, but since the projecting part 12A is formed in the shaft part side, the clamp member 16 is never removed from the shaft part 12A under the ordinary use condition. The clamp member 16 can be attached and detached freely to/from the shaft part 12 by deforming the clamp member 16 within an elastic limit thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch locking structure, and more particularly to a switch locking structure that locks a switch knob so as not to come off from a case to which the switch is attached.

[0002]

2. Description of the Related Art The conventional locking structure for this type of switch is
As shown in FIGS. 5 and 6, the shaft portion 4 extending from the lower surface of the knob 2 is inserted into the opening 6A of the case 6 to which the switch is attached, and the shaft portion 4 is attached to the shaft portion 4 so that the knob 2 does not come out from the back side of the case 6. The locking member 8 is attached.

The locking member 8 is made of a metallic elastic material such as stainless steel or phosphor bronze, and the shaft is molded of resin by press-fitting the locking member 8 into the shaft portion 4 of the knob 2. Claw portion 8A of the locking member 8 on the portion 4
Is fixed as if it bites.

[0004]

However, in the case of the above-described conventional switch locking structure, once the locking member 8 is attached to the shaft portion 4, the locking member 8 cannot be removed, and therefore the knob is used. There is a problem that 2 cannot be freely attached and detached. Further, since the locking member 8 is made of metal, the cost of the die (press) for manufacturing the locking member 8 becomes expensive.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a switch locking structure in which the knob can be freely attached and detached and the manufacturing cost of the locking member can be reduced. To aim.

[0006]

In order to achieve the above object, the present invention inserts a shaft portion extending from a lower surface of a switch knob into an opening of a case to which the switch is attached, and removes the knob from the back side of the case. In a locking structure of a switch in which a locking member is attached to the shaft portion so as to prevent it from forming, a protruding portion is formed on a side surface of the shaft portion of the knob, and the locking member is formed of a plastic plate. Then, two or four for forming an opening in the locking member having substantially the same shape as the cross section of the shaft portion and forming one or two elastic pieces from the opening.
It is characterized in that a notch is made in the book, and the locking member is attached by pushing it over the overhanging portion of the shaft portion and into the shaft portion. Further, the locking member is characterized in that one more cut is made from the opening to the outer periphery.

[0007]

According to the present invention, the protruding portion for preventing the pull-out is formed on the side surface of the shaft portion of the knob, and the locking member is formed of the plastic plate. And
An opening having substantially the same shape as the cross section of the shaft portion is formed in this locking member, and two or four notches for forming one or two elastic pieces are formed from the opening, and the locking member is It is attached by pushing it over the overhanging part of the shaft part and into the shaft part. The holding force of the shaft part of the knob by the elastic piece formed on the locking member is smaller than that of a metal one, but since the overhanging part is formed on the shaft side, the locking member is used under normal use conditions. Does not come off the shaft. Further, since the locking member is highly elastic, the knob can be freely attached and detached by deforming the locking member within the elastic limit, and in particular, one cut is made from the opening to the outer periphery of the locking member. When put in, the knob can be easily attached and detached.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a switch locking structure according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing an embodiment of a switch locking structure according to the present invention. In the figure, 10 is a knob, 12 is a knob 1
Shaft portion extending from the lower surface of 0, 14 is a case, 16
Is a locking member. The lock structure of the switch according to the present invention is the shape of the shaft portion 12 of the knob 10 and the lock member 1.
6 is different from the conventional one.

That is, the shaft portion 12 is formed with a pair of overhang portions 12A, 12A on its side surface for preventing the shaft portion 12 from coming off. The locking member 16 is formed of a plastic plate (polyester plate). The locking member 16 made of the polyester plate has an opening 16A having a shape substantially the same as the cross section of the shaft portion 12 at the center thereof. In FIG. 1, the length of the opening 16A in the vertical direction is the shaft portion 12
The length of the opening 16A in the horizontal direction is formed to be slightly smaller than the length of the cross section of the shaft portion 12 in the horizontal direction, although the length is the same as the vertical length of the cross section.

The locking member 16 has an opening 16A.
From the opening 16A, two cuts 16C and 16C for forming one elastic piece 16B are made, and further, one cut 16D from the opening 16A to the outer circumference is made.
The cut 16D is formed on the shaft portion 1 of the locking member 16.
It is for easy attachment / detachment to / from 2. When the knob 10 is attached to the case 14 by the switch locking structure having the above configuration, the shaft portion 12 of the knob 10 is inserted from the front side of the case 14 into the opening 14A formed in the case 14, and the back side of the case 14 is inserted. From shaft part 12
The locking member 16 is inserted into. Here, when the locking member 16 is inserted, the opening 16A is widened by the bending and the cut 16D of the elastic piece 16B formed in the locking member 16, so that the locking member 16 of the shaft portion 12 is expanded as shown in FIG. It can be pushed into the shaft portion 12 beyond the overhang portions 12A, 12A.

FIG. 3 is a sectional view of FIG. As shown in the figure, when the locking member 16 is attached to the shaft portion 12A of the knob 10, as described above, the locking member 16
Since the horizontal length of the opening 16A is slightly smaller than the horizontal length of the cross section of the shaft portion 12, the elastic piece B presses the shaft portion 12 in a bent state. As a result, there is no backlash between the locking member 16 and the shaft portion 12, and an appropriate holding force can be obtained. The holding force of the shaft portion 12 by the locking member 16 formed on the plastic plate is smaller than that of a conventional metal member, but since the overhanging portions 12A and 12A are formed on the shaft portion 12 side, The locking member 16 does not come off from the shaft portion 12 in a normal use state. Further, since this locking member 16 is made of plastic, it can be detached from the shaft portion 16 by deforming within the elastic limit thereof.

4 (A) to 4 (D) are plan views showing other embodiments of the locking member according to the present invention. The locking members 20, 22, 24, 26 are each formed of a plastic plate. The locking member 20 shown in FIG. 9A has two cutouts 16C and 16C for forming an opening 20A and one elastic piece 20B from the opening 20A.
C is included. That is, it is different from the locking member 16 described above in that no cut is made from the opening to the outer periphery. In the case of this locking member 20, the shaft portion 12 is more than the locking member 16 having the notch 16D.
It becomes difficult to put on and take off.

The locking member 22 shown in FIG.
2A and two elastic pieces 22B, 22 from the opening 22A.
4 notches 22C, 22C, 22 for forming B
C and 22C are included. That is, this locking member 22
Is different from the locking member 20 of FIG. 9A in that two elastic pieces 22B and 22B facing each other with the opening 22A in between are formed.

The locking member 24 shown in FIG.
4A and its opening 24A to two elastic pieces 24B, 24
4 notches 24C, 24C, 24 for forming B
C and 24C are formed, and further, a cutout 24D from the opening 24A to the outer periphery is formed. That is, the locking member 24 is different from the locking member 22 of FIG. 1B in that a notch 24D from the opening 24A to the outer periphery is formed.

The locking member 26 shown in FIG.
6A and two elastic pieces 26B, 26 from the opening 26A.
4 notches 26C, 26C, 26 for forming B
C and 26C are provided, and further, a notch 26D from the opening 26A to the outer periphery is provided. That is, in this locking member 26, the length of the opening 26A in the vertical direction is slightly smaller than that of the locking member 24 in FIG. 7C, and the elastic pieces 26B, 26B are formed adjacent to each other. It is different in that there is.

Since the locking member according to the present invention is made of plastic (polyester material), the mold cost can be larger than that of the press mold for manufacturing the metal locking member. Therefore, the cost can be reduced.

[0017]

As described above, according to the locking structure of the switch of the present invention, the protruding portion for preventing the pull-out is formed on the side surface of the shaft portion of the knob, and the locking member is formed of the plastic plate. An opening having substantially the same shape as the cross section of the shaft portion is formed in this locking member, and two or four notches for forming one or two elastic pieces are formed from the opening, and the locking member is The holding force of the knob shaft part by the elastic piece formed on the locking member is smaller than that of the metal part because it is attached by pushing it over the overhang part of the shaft part. Since the projecting portion is formed on the side of the portion, the locking member does not come off from the shaft portion in a normal use state. Also, since the locking member made of a plastic plate is highly elastic, it can be freely attached to and detached from the shaft portion by deforming the locking member within its elastic limit. By making a single notch, it is easier to attach and detach the shaft. Moreover, since the locking member is made of plastic also for the die cost, it is possible to reduce the manufacturing cost of the locking member by using an inexpensive big mold.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a switch locking structure according to the present invention.

FIG. 2 is a perspective view showing an assembled state of the locking structure of the switch shown in FIG.

FIG. 3 is a sectional view of FIG.

FIG. 4A to FIG. 4D are plan views showing other embodiments of the locking member according to the present invention.

FIG. 5 is an exploded perspective view showing an example of a conventional switch locking structure.

6 is a perspective view showing an assembled state of the switch locking structure shown in FIG. 5;

[Explanation of symbols]

10 ... Knob 12 ... Shaft part 12A ... Overhang part 14 ... Case 16, 20, 22, 24, 26 ... Locking member 16A, 20A, 22A, 24A, 26A ... Opening 16B, 20B, 22B, 24B, 26B ... Elasticity Piece 16C, 16D, 20C, 22C, 24C, 24D, 2
6C, 26D ... Notch

Claims (4)

[Claims] 1. A shaft member extending from a lower surface of a switch knob is inserted into an opening of a case to which the switch is attached, and a locking member is attached to the shaft portion so that the knob does not come out from a back side of the case. In the locking structure of the switch, an overhanging prevention portion is formed on a side surface of the shaft portion of the knob, and the locking member is formed of a plastic plate, and the locking member has substantially the same cross section as that of the shaft portion. Two openings are formed to form an opening having a shape and one elastic piece is formed from the opening, and the locking member is attached so as to be pushed into the shaft portion beyond the protruding portion of the shaft portion. The locking structure of the switch characterized in that. 2. The locking structure for a switch according to claim 1, wherein the locking member is further provided with one notch from the opening to the outer periphery. 3. A shaft member extending from a lower surface of a switch knob is inserted into an opening of a case to which the switch is attached, and a locking member is attached to the shaft portion so as to prevent the knob from coming out from a back side of the case. In the locking structure of the switch, an overhanging prevention portion is formed on a side surface of the shaft portion of the knob, and the locking member is formed of a plastic plate, and the locking member has substantially the same cross section as that of the shaft portion. 4 cuts for forming two shaped elastic openings and forming two elastic pieces from the openings are formed, and the locking member is attached so as to be pushed into the shaft portion beyond the protruding portion of the shaft portion. The locking structure of the switch characterized in that. 4. The switch locking structure according to claim 3, wherein the locking member is further provided with one notch from the opening to the outer periphery.