JP3132360B2 - Mounting structure of operation knob - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an operation knob used by being mounted on a rotatable shaft such as a variable resistor, a rotary switch, and a handle.

[0002]

2. Description of the Related Art In general, rotary electronic components such as a variable resistor, a rotary switch, and a channel are provided with operation knobs formed of, for example, a synthetic resin so that the rotary electronic components can be operated with bare hands. To prevent slipping between the rotating shaft of the rotary electronic component and the operating knob when the operating knob is rotated, a predetermined side surface is formed in a plane parallel to the axial direction from the upper end of the rotating shaft. A notch is formed in the cutout to provide a D-shaped cross-section for rotation prevention (hereinafter referred to as a D-cut surface), and a mounting hole is provided in the operation knob corresponding to the D-cut surface shape, and a rotary shaft is formed in the mounting hole. To form an operation unit.

However, in the case of a large-diameter operation knob to which a large rotation torque is applied at the time of rotation, since the mounting hole is formed of a resin material, it cannot withstand the rotation torque and is deformed. There was a case where there was a gap between the shaft and the shaft, rattling occurred, and the operation knob came off the rotating shaft.

As means for solving this problem, for example, FIG.
As shown in FIG. 7, a cylindrical metal nut B is inserted and fixed at the center of the lower end of the operation knob A, and the rotary shaft E of the rotary electronic component D is inserted into the hollow portion C of the nut B. B, a screw hole F penetrating the cylindrical side surface portion is formed, and a tool insertion hole G is formed in the operation knob A corresponding to the screw hole F position.
The fixing screw H is screwed into the screw hole F with a tool such as a wrench through the tool insertion hole G, and the tip of the fixing screw H is brought into contact with the rotating shaft E to be inserted. Knob A is often fixed.

[0005]

In this case, a fixing screw H is screwed into the screw hole F, and the D-cut surface I of the rotary shaft E is cut.
In this conventional structure, the rotating shaft E of the rotary electronic device D is hidden by the nut B of the operating knob A. Since the fixing screw H is screwed in a state where the direction of the D-cut surface I of the rotating shaft E cannot be confirmed, the screw may not be screwed from a direction perpendicular to the D-cut surface I. was there. Then, the fixing screw H is moved from the direction displaced from the vertical
When the fixing screw H is screwed into the D-cut surface I with a strong force, the tip of the fixing screw H is separated from the D-cut surface I when the operation knob A is rotated. There is a problem that rattling occurs on the knob A, and there is a possibility that an accurate rotation operation cannot be performed or the operation knob A may come off the rotary shaft E.

[0006] Even if it is attempted to provide positioning in the hollow portion C of the metal nut B corresponding to the direction of the fixing screw H, the hollow portion C of the nut B is generally cut by a drill or the like. Therefore, it is inevitable that the hollow portion C has a circular shape in the depth direction, and the operation knob A must be assembled without any positioning in the rotation direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a simple structure so that an operation knob can be easily attached to a rotary shaft and can be securely fixed. The purpose is to provide an operation knob.

[0008]

According to the present invention, there is provided an operation knob made of a synthetic resin material, a cylindrical metal member provided with a hollow portion provided in an opening at the center of the lower end of the operation knob, and A screw portion provided toward the axial direction of the metal member, and an end portion of a round bar-shaped portion inserted into the hollow portion of the metal member on the operation knob side, in a plane parallel to the axial direction. A shaft having a notched rotation preventing flat surface portion, and a screw tightened toward the flat surface portion of the shaft via the screw portion of the metal member, and the operation knob side of the shaft is prevented from rotating. A fixing screw for fixing, wherein the fixing screw is fitted to the flat portion of the shaft so as to abut vertically on the flat portion of the shaft.
A regulating portion for determining an insertion position of the operation knob with respect to the shaft is provided integrally with the operation knob within the opening of the operation knob.

Further, the metal member is insert-molded on the operation knob, and the regulating portion is provided in the hollow portion of the metal member.

Further, a resin inflow passage is formed in a part of the metal member.

[0011]

DETAILED DESCRIPTION OF THE INVENTION An operation knob is provided on a shaft of a rotary electronic component having a flat portion for preventing rotation which is formed by cutting out a predetermined side surface of a round bar-shaped member in parallel with an axial direction thereof. In the present invention, an operation knob made of a synthetic resin material is provided, and a cylindrical metal member having a hollow portion is provided at an opening at the center of the lower end of the operation knob. The hollow portion is inserted into the shaft, and is fixed to the shaft by being brought into contact with a flat portion of the shaft by a fixing screw screwed into a screw portion of a metal member. At this time, the fixing screw is Since the regulating portion for determining the insertion position of the operation knob is provided integrally from the operation knob in the opening of the operation knob so as to abut against the flat portion of the shaft vertically, when assembling,
Even if you do not know in which direction the flat part of the shaft faces, by slightly turning the operation knob to the left and right while pressing lightly against the shaft, the position where the flat part of the shaft faces the fixing screw Then, the operation knob is inserted and fitted into the regulating portion, and the temporary fixing is performed. Then, by tightening the fixing screw in this state, the fixing screw comes into contact with the plane portion in the vertical direction, and is fixed to the rotation preventing member.

[0012] Further, in forming the restricting portion,
In order to ensure the fixation of the metal member and the casing of the operation knob, the metal member is insert-molded into the operation knob, and the resin is inserted into the hollow portion of the metal member at the time of molding to provide the regulating portion. Things.

When the metal member is subjected to insert molding, for example, when the metal member has a closed-end cylindrical shape with a closed upper portion, a resin inflow passage is formed in a part of the metal member. The resin is introduced into the hollow portion of the metal member through the resin inflow passage at the time of molding to provide the restricting portion.

[0014]

1 and 2 show a first embodiment of the present invention, in which the upper end of a round bar-shaped member is formed by notching a predetermined side surface in a plane parallel to the axial direction. Shape is almost D
It is composed of a shaft 3 of a rotary electronic component 2 having a rotation-preventing flat portion 1 formed in a character shape, and an operation knob 4 inserted and fixed to the shaft 3.

The operation knob 4 has an opening 5 at the center of the lower end.
, A cylindrical metal member 6 is press-fitted. The outer peripheral surface of the metal member 6 is subjected to knurling to make the connection between the metal member 6 and the opening 5 good.

The metal member 6 is formed from a cylindrical member, has a hollow portion 7 formed along the axis so that the shaft 3 can be inserted, and is formed from a female screw toward the axis of the metal member 6. Screw portion 8 is provided. The screw portion 8 projects toward the hollow portion 7 so as to be able to contact the flat portion 1 of the shaft 3 inserted into the hollow portion 7, and a fixing screw 9 is screwed in a direction perpendicular to the axis of the shaft 3. are doing.

The operation knob 4 is provided with a tool insertion hole 10 corresponding to the position of the fixing screw 9 so that a fixing screw 9 screwed to the screw portion 8 of the metal member 6 can be tightened. From 10, a tool such as a hexagon wrench or a screwdriver is inserted, and the fixing screw 9 is tightened to attach and fix the operation knob 4 to the shaft 3.

A fixing screw 9 is provided on the upper bottom portion 5a in the opening 5 of the operation knob 4 so that when the operation knob 4 is inserted into the shaft 3, the fixing screw 9 comes into perpendicular contact with the flat portion 1 of the shaft 3. A restricting portion 11 for determining an insertion position of the operation knob 4 with respect to the shaft 3 is provided.

The restricting portion 11 is provided with a fixing screw 9 screwed to the screw portion 8 of the metal member 6 of the operation knob 4, and the shaft 3
The operation knob 4 is fitted to the flat portion 1 of the shaft 3 only at a position where the flat portion 1 of the shaft 3 is vertically contacted, that is, at a position where the tip of the fixing screw 9 is vertically opposed to the flat portion 1 of the shaft 3. In this embodiment, the upper bottom 5
a comprising a convex portion provided on a. If the tip of the fixing screw 9 is at a rotational position deviated from the vertical position with respect to the plane part 1 of the shaft 3, the upper bottom part 5 of the operation knob 4
The restricting portion 11 formed of a convex portion provided on the shaft portion 3a cannot be fitted to the flat portion 1 of the shaft 3.

Therefore, at the time of assembly, it is not necessary to know in which direction the flat portion 1 of the shaft 3 faces.
By inserting the operation knob 4 into the shaft 3 and turning the operation knob 4 slightly left and right while slightly pressing the shaft 3, at a position where the flat portion 1 of the shaft 3 faces the fixing screw 9, Since the operation knob 4 is inserted and fitted into the restricting portion 11, if the fixing screw 9 is tightened at this insertion position, the fixing screw 9 abuts on the flat portion 1 in the vertical direction, and is fixedly prevented from rotating. is there.

The work of tightening the fixing screw 9 is as follows.
Since the flat portion 1 of the shaft 3 is inserted and fitted into the regulating portion 11 of the operation knob 4 and the operation knob 4 is temporarily fixed to the shaft 3, the tightening operation can be easily performed. .

FIG. 3 shows a second embodiment of the present invention, in which a vertically penetrating metal member 6 is insert-molded into an operation knob 4 and, at the time of this molding, an operation knob is inserted through an upper penetrating portion 12. The resin 11 enters the hollow portion 7 of the metal member 6 from the casing portion 4 to form the regulating portion 11.

In this way, in fixing the metal member 6 to the operation knob 4, compared with the fixing by press-fitting the metal member 6 in the above-described embodiment, the metal member 6 is fixed.
And the casing of the operation knob 4 can be securely fixed, and the press-fitting step can be omitted.

FIG. 4 shows a third embodiment of the present invention. In the case where the metal member 6 is insert-molded, for example, when the metal member 6 is in the form of a closed-end cylinder with a closed upper part. A resin inflow passage 13 having a lateral hole formed in the side surface of the cylindrical portion of the metal member 6 is formed.

When insert-molding the metal member 6 according to the present configuration, the resin is introduced into the hollow portion 7 of the metal member 6 from the casing of the operation knob 4 through the resin inflow passage 13 so as to regulate the resin. The second embodiment forms the portion 11, and the same effects as those of the second embodiment can be obtained.

In this embodiment, a rotary electronic component 2 provided with a flat portion 1 having a substantially D-shaped cross section by cutting out only a predetermined one side surface of a round bar-shaped member.
Although the shaft 3 is used, the present invention can be applied to a shaft having flat portions formed in a plurality of directions.

In this embodiment, the flat portion 1 of the shaft 3 is provided.
The positioning at the time of insertion of the operation knob 4 is performed by fitting the regulating portion 11 to the upper end portion, but the positioning is performed by fitting the regulating portion 11 at the center or lower portion of the plane portion. You may.

The shape of the operation knob 4 can also be appropriately selected according to the design specifications.

[0029]

According to the present invention, there is provided an operation knob made of a synthetic resin material, a cylindrical metal member provided with a hollow portion provided at an opening at the center of the lower end of the operation knob, and an operation knob of the metal member. A screw portion provided toward the axial direction, and a notch formed in a flat shape parallel to the axial direction at an end of a round bar portion inserted into the hollow portion of the metal member on the operation knob side. A shaft having a flat portion for stopping, and a fixing screw for screwing the flat portion of the shaft to the flat portion via the screw portion of the metal member, thereby preventing the operation knob side from rotating with respect to the shaft; The fixing screw is fitted to the flat portion of the shaft so as to abut against the flat portion of the shaft perpendicularly, and is fixed to the shaft.
Since the regulating portion for determining the insertion position of the operating knob with respect to the operating knob is integrally provided in the opening of the operating knob from the operating knob, the operating knob is positioned at a position where the flat portion of the shaft faces the fixing screw. And temporarily fixed, and the screwing operation can be easily performed. Then, by tightening the fixing screw in this state, the fixing screw comes into contact with the flat portion in the vertical direction, and the operation knob can be securely stopped and fixed to the shaft, and the operation knob can be fixed to the shaft when the operation knob rotates. However, it is possible to prevent a situation in which the operation knob is loosened or the operation knob comes off the shaft.

Further, since the metal member is insert-molded on the operation knob and the regulating portion is provided in the hollow portion of the metal member, the metal member and the casing portion of the operation knob can be securely fixed. And the press-fitting step can be omitted.

Since the resin inflow passage is formed in a part of the metal member, the resin in the casing of the operation knob flows into the hollow portion through the resin inflow passage even if the metal member has a closed upper bottom. As a result, the regulation portion can be formed inside the hollow portion, the metal member and the casing of the operation knob can be securely fixed, and the press-fitting step can be omitted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional example.

FIG. 6 is a sectional view showing a conventional example.

FIG. 7 is a perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat part 2 Rotary electronic component 3 Shaft 4 Operation knob 5 Opening 6 Metal member 7 Hollow part 8 Screw part 9 Fixing screw 11 Restriction part 13 Resin inflow passage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01C 10/00 H01H 19/14

Claims (3)

(57) [Claims] An operation knob made of a synthetic resin material, a cylindrical metal member having a hollow portion provided at an opening at the center of the lower end of the operation knob, and an axial direction of the metal member. A screw portion provided toward the end, and a non-rotating plane formed by notching a flat plate parallel to the axial direction at an end of a round bar portion to be inserted into the hollow portion of the metal member on the operation knob side. A shaft having a portion, and a fixing screw which is screwed toward the flat portion of the shaft via the screw portion of the metal member, and which stops and fixes the operation knob side to the shaft. A restricting portion that fits into the flat portion of the shaft so that the fixing screw abuts perpendicularly to the flat portion of the shaft and determines an insertion position of the operating knob with respect to the shaft; To Mounting structure of the operation knob, characterized in that provided integrally from serial operation knob. 2. The mounting structure for an operation knob according to claim 1, wherein the metal member is insert-molded on the operation knob, and the restricting portion is provided in the hollow portion of the metal member. 3. The mounting structure according to claim 2, wherein a resin inflow passage is formed in a part of said metal member.