JP2022138273A - Knob structure and mounting method - Google Patents

Abstract

To reduce an axial load on a rotary shaft at the time of installing, and maintain the state of installation on the rotary shaft.SOLUTION: A knob structure includes a knob body 2 formed with a radially flexible cylindrical member 3 through which a rotary shaft 10A can be inserted in an axial direction, and a fixed member 4 that is attached to the outer periphery of the cylindrical member 3 from the tip side of the rotary shaft 10A and presses the cylindrical member 3 toward the rotary shaft 10A.SELECTED DRAWING: Figure 3

Description

The present invention relates to a knob structure and a knob mounting method.

Conventionally, for example, Patent Document 1 discloses a knob mounting device. The knob rotates the tuning round shaft of the radio receiver. The knob has a cylindrical shaft portion fitted to the round shaft, and a ring spring attached to the outer periphery of the shaft portion. In the knob mounting device, a ring spring applies frictional torque between the round shaft and the shaft portion to transmit the turning force of the knob to the round shaft.

Patent Document 1 discloses a knob body having an engaging portion provided on a part of a cylindrical inner wall, a round shaft engaged with the engaging portion and provided with a slot at the tip, and a slotted portion of the round shaft. and a spring that is inserted and presses against the cylindrical inner wall of the knob body.

Japanese Utility Model Laid-Open No. 60-187923

The conventional knob mounting device described above has a structure in which the knob is mounted on the round shaft by the elastic force of the spring. In this knob mounting device, when the knob is attached to the round shaft, the knob is press-fitted against the elastic force of the spring so as to be pressed in the axial direction, which is the extending direction of the round shaft. For this reason, in the conventional knob mounting device, since a load is applied to the round shaft in the axial direction during mounting, it is essential that the maximum load capacity of the specifications of the electronic device in the axial direction is not exceeded. However, if the elastic force of the spring is reduced in order to suppress the load in the axial direction on the rotating shaft of the electronic component, the knob tends to come off from the rotating shaft.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a knob structure and a method of attaching a knob that can reduce the axial load on the rotating shaft during attachment and maintain the attached state to the rotating shaft.

In order to achieve the above object, a knob structure according to one aspect of the present invention comprises a knob body formed with a cylindrical member which is axially insertable by a rotating shaft and which is flexible in the radial direction; a fixing member that is attached to the outer periphery of the cylindrical member from the side and presses the cylindrical member toward the rotating shaft.

In order to achieve the above object, a knob mounting method according to one aspect of the present invention includes the steps of: axially inserting a rotating shaft through a radially flexible cylindrical member formed in a knob body; a step of pressing the cylindrical member toward the rotating shaft by a fixing member attached to the outer periphery of the cylindrical member from the distal end side of the shaft; and a step of attaching a cover member to the knob body to cover the cylindrical member and the fixing member. and including.

According to the present invention, it is possible to reduce the axial load on the rotating shaft during attachment, and to maintain the state of attachment to the rotating shaft.

FIG. 1 is an exploded perspective view of a knob structure according to an embodiment of the present invention. FIG. 2 is an exploded sectional view of the knob structure according to the embodiment of the present invention. FIG. 3 is an installation cross-sectional view of the knob structure according to the embodiment of the present invention. FIG. 4 is an exploded cross-sectional view of another example of the knob structure according to the embodiment of the present invention. FIG. 5 is a flow chart of a knob mounting method according to an embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates in detail, referring drawings for the form (henceforth embodiment) for implementing invention. In addition, the present invention is not limited by the following embodiments. In addition, components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that fall within a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be combined as appropriate.

FIG. 1 is an exploded perspective view of a knob structure according to an embodiment of the present invention. FIG. 2 is an exploded sectional view of the knob structure according to the embodiment of the present invention. FIG. 3 is an installation cross-sectional view of the knob structure according to the embodiment of the present invention.

The knob structure of the embodiment is a structure for attaching the knob 1 to the rotating shaft 10A of the electronic component 10 such as an encoder. The knob 1 rotates the rotating shaft 10A. The rotating shaft 10A is formed in a cylindrical shape extending along the axial direction in which the central axis C of rotation extends. The rotary shaft 10A of the embodiment has a flat portion 10Aa formed on a part of the cylindrical outer periphery, and is configured so that the knob 1 is fitted thereon during rotation. Although not shown, instead of the flat portion 10Aa, the rotating shaft 10A may be configured to have a slit extending axially inward from the cylindrical tip so that the knob 1 is fitted. The electronic component 10 is connected to a substrate inside the housing 100 of the electronic device, and is provided with the rotating shaft 10A protruding outside the housing 100 . Here, in the direction in which the central axis C extends, the side closer to the rotating shaft 10A (housing 100) is referred to as the axial inner side, and the side farther from the rotating shaft 10A (housing 100) is referred to as the axial outer side.

The knob 1 includes a knob body 2 , a fixing member 4 and a cover member 5 .

The knob main body 2 is an operation portion for operating the rotation of the rotation shaft 10A of the electronic component 10, and is formed in a disc shape. The knob main body 2 has a grooved portion 2A formed along its outer periphery along the circumferential direction to prevent slipping when the rotating shaft 10A is operated to rotate. In the knob body 2 of the embodiment, the grooved portion 2A is configured as a separate member, but the grooved portion 2A may be formed integrally with the knob body 2. The knob body 2 is formed with a recessed portion 2B at the central portion thereof, which opens outward in the axial direction in a circular shape and recesses inward in the axial direction in the shape of a cylinder. Further, the knob body 2 has an outer surface 2C on the axially outer side where the recessed portion 2B is open, and an edge portion 2D is formed continuously on the outer periphery of the outer surface 2C and protrudes axially outward. Further, the knob body 2 is formed with a projection 2E projecting outward in the axial direction within the recess 2B at the bottom of the recess 2B. A plurality of protrusions 2E are formed around a cylindrical member 3 formed at the center of the recess 2B.

The knob body 2 is formed including a tubular member 3 . The tubular member 3 is integrally formed with the knob body 2 . The cylindrical member 3 is formed at the center of the recess 2B of the knob body 2 so as to extend outward in the axial direction from the bottom of the recess 2B. The cylindrical member 3 is formed inside the outer surface 2C of the knob body 2 in the axial direction. The tubular member 3 is formed in a cylindrical shape. The cylindrical member 3 has a distal end portion 3A provided so as to close the axially outer distal end thereof, and is formed to be open axially innerward. The rotating shaft 10A of the electronic component 10 is inserted through the cylindrical member 3 through an inner opening in the axial direction. The shape of the inside of the cylinder member 3 is formed to match the shape of the rotating shaft 10A, and a flat portion is formed on a part of the circular inner wall to fit the flat portion 10Aa of the rotating shaft 10A. Further, the tubular member 3 is formed with a slit 3B extending axially inwardly from the distal end portion 3A so as to be divided in a circumferential direction intersecting with the axial direction. The slot 3B is formed in a cross shape when viewed from the axial direction, and is configured to divide the tubular member 3 into four parts in the circumferential direction. Note that the slot 3B may be formed in a single line when viewed from the axial direction so as to divide the tubular member 3 into two in the circumferential direction. That is, the slit 3B divides the cylindrical member 3 in the circumferential direction. The tubular member 3 has flexibility such that each divided by the slit 3B bends in the radial direction. A male screw groove 3C is formed on the outer periphery of the tubular member 3 . The male screw groove 3C is a groove spirally formed from the outer side to the inner side in the axial direction of the tubular member 3 . Therefore, the tubular member 3 is formed in a so-called bolt shape. Although the cylindrical member 3 is shown integrally molded with the knob body 2, it may be molded separately from the knob body 2 and attached integrally.

The fixing member 4 is formed in the shape of a hexagonal prism in the embodiment, and is formed with a hole penetrating in the axial direction. The fixing member 4 has a groove portion 4A formed on the outer surface in the axial direction. In addition, the fixing member 4 has a female screw groove 4B formed on the inner surface of the hole. The female screw groove 4B is spirally formed in the axial direction. Therefore, the fixed member 4 is formed in a so-called nut shape and configured to be axially movable with respect to the cylindrical member 3 . The fixing member 4 is screwed inward in the axial direction with respect to the cylindrical member 3 with the female thread groove 4B meshing with the male thread groove 3C of the cylindrical member 3, and is housed inside the concave portion 2B of the knob body 2. As shown in FIG. Further, the fixed member 4 has an inner diameter D2 formed by the groove bottom of the female screw groove 4B smaller than the outer diameter D1 of the cylindrical member 3 . Therefore, when the fixing member 4 is screwed into the tubular member 3, the tubular member 3 is divided by the slits 3B so as to move toward each other in the radial direction toward the central axis C due to flexibility.

The cover member 5 is formed in a disc shape. The cover member 5 is fitted into the inside surrounded by the edge portion 2D of the knob body 2 and fixed by adhesion or the like, and faces the outer surface 2C to cover the concave portion 2B.

FIG. 4 is an exploded cross-sectional view of another example of the knob structure according to the embodiment of the present invention.

The knob 11 of the embodiment shown in FIG. 4 differs from the tubular member 3 and the fixed member 4 of the knob 1 of the embodiment shown in FIGS. The configurations are equivalent. Therefore, only the cylindrical member 31 and the fixing member 41 will be described for the knob 11, and the same reference numerals will be given to the same components, and the description will be omitted.

The knob body 2 is formed including a tubular member 31 . The tubular member 31 is integrally formed with the knob body 2 . The cylindrical member 31 is formed at the center of the recess 2B of the knob body 2 so as to extend outward in the axial direction from the bottom of the recess 2B. The cylindrical member 31 is formed inside the outer surface 2</b>C of the knob body 2 in the axial direction. The tubular member 31 is formed in a cylindrical shape. The tubular member 31 has a distal end portion 31A provided so as to block an axially outer distal end, and is formed to be open axially innerward. The rotating shaft 10A of the electronic component 10 is inserted through the tubular member 31 through an inner opening in the axial direction. The cylindrical member 31 has an inner shape that matches the shape of the rotating shaft 10A, and a flat portion is formed on a part of the circular inner wall to fit the flat portion 10Aa of the rotating shaft 10A. Further, the tubular member 31 is formed with a slot 31B extending axially inwardly from the distal end portion 31A and divided in a circumferential direction intersecting with the axial direction. The slot 31B is formed in a cross shape when viewed from the axial direction, and is configured to divide the cylindrical member 31 into four parts in the circumferential direction. Note that the slot 31B may be formed in a straight line when viewed in the axial direction so as to divide the cylindrical member 31 into two parts in the circumferential direction. That is, the slot 31B divides the tubular member 31 in the circumferential direction. The cylindrical member 31 has flexibility such that each divided by the slit 31B bends in the radial direction. The cylindrical member 31 is formed with a slope 31C inclined with respect to the axial direction so that the outer diameter of the cylindrical member 31 gradually increases from the outer side to the inner side in the axial direction. A locking groove 31D is formed at the axially inner end of the slope 31C on the outer circumference of the cylindrical member 31. As shown in FIG. The locking groove 31</b>D is formed along the circumferential direction of the cylindrical member 31 . Although the cylindrical member 31 is shown integrally molded with the knob body 2, it may be molded separately from the knob body 2 and attached integrally.

The fixing member 41 is configured as a coil spring spirally formed around the central axis C in the axial direction. The fixing member 41 is arranged around the cylindrical member 31 so as to pass through the cylindrical member 31, and is attached to the cylindrical member 31 with a part of the inner side in the axial direction being locked by the locking groove 31D. The fixed member 41 is configured to be axially movable with respect to the tubular member 31 . The fixed member 41 has an inner diameter D5 that is equal to or slightly larger than the outer diameter D3 of the axially outer tip portion 31A of the cylindrical member 31, and the outer diameter of the axially inner end of the inclined surface 31C of the cylindrical member 31. An inner diameter D5 is formed smaller than D4. Therefore, when the fixing member 41 is attached to the outer periphery of the cylindrical member 31, the elastic force of the fixing member 41 causes the cylindrical member 31 to move toward the central axis C due to the flexibility of the pieces divided by the slits 31B. will approach

FIG. 5 is a flow chart of a knob mounting method according to an embodiment of the present invention.

As a procedure for attaching the knobs 1 and 11 described above to the rotary shaft 10A of the electronic component 10, as shown in FIG. ) (step S2), and the cover member 5 is attached to the knob body 2 (step S3).

In step S2, a tool such as a wrench is fitted into the hexagonal prism shape of the fixed member 4, or a tool such as a flat-blade screwdriver is fitted into the groove 4A to move the fixed member 4 to the tip of the rotating shaft 10A at the outside in the axial direction. From the side, it is screwed into the cylindrical member 3 through which the rotating shaft 10A is inserted. When the fixing member 4 is screwed into the cylindrical member 3, the cylindrical member 3 is divided by the slits 3B so that the individual pieces of the cylindrical member 3 are flexibly directed toward the central axis C as indicated by the arrows in FIG. approach radially. Therefore, the cylindrical member 3 is fixed to the rotating shaft 10A so as to tighten the rotating shaft 10A. Further, in step S2, it can be confirmed that the cylindrical member 3 is bent and fixed to the rotating shaft 10A by screwing the fixing member 4 until it abuts against the projection 2E in the recess 2B. When the fixing member 4 is screwed in until it comes into contact with the projection 2E in the recess 2B, the fixing member 4 is accommodated in the recess 2B and arranged axially inward of the outer surface 2C of the knob body 2 as a whole.

Further, in step S2, the fixing member 41 is axially moved and attached to the tubular member 31 through which the rotating shaft 10A is inserted from the axially outer side and the distal end side of the rotating shaft 10A. Alternatively, in step S2, while expanding the fixing member 41 radially outward by an appropriate tool, it is axially extended from the axially outer side of the rotating shaft 10A to the cylindrical member 31 through which the rotating shaft 10A is inserted. Move and install. When the fixing member 41 is attached to the cylindrical member 31, the knob body 2 is held so that no axial load is applied to the rotating shaft 10A. When the fixing member 41 is axially moved with respect to the cylinder member 31, the cylinder members 31 are divided by the slits 31B and move toward each other in the radial direction toward the center axis C due to flexibility. Therefore, the cylindrical member 31 is fixed to the rotating shaft 10A so as to tighten the rotating shaft 10A. Further, in step S2, by moving the fixing member 41 until it fits into the locking groove 31D of the cylindrical member 31, it can be confirmed that the cylindrical member 31 is bent and fixed to the rotating shaft 10A. When the fixing member 41 is moved until it fits into the locking groove 31D, the fixing member 41 is housed in the recess 2B, and the whole is arranged inside the outer surface 2C of the knob body 2 in the axial direction.

In step S3, by attaching the cover member 5 to the knob body 2, the concave portion 2B is covered and the appearance can be improved. In step S3, the cover member 5 is fitted inside the edge portion 2D of the knob body 2 and faces the outer surface 2C, so that the fixing members 4 and 41 are accommodated in the concave portion 2B and the entire outer surface of the knob body 2 is covered. It can be confirmed that the cylindrical member 31 is arranged axially inward of 2C, that is, the cylindrical member 31 is bent and fixed to the rotating shaft 10A. Note that the cover member 5 may be integrated with the fixing members 4 and 41, or the fixing members 4 and 41 may be fixed to perform step S2 and step S3 together.

As described above, the knob structure of the embodiment includes the knob body 2 formed with the cylindrical members 3 and 31 which are radially flexible and which allow the rotary shaft 10A to be inserted in the axial direction. Fixing members 4 and 41 attached to press the tubular members 3 and 31 toward the rotating shaft 10A are provided. Therefore, according to the knob structure of the embodiment, since the cylindrical members 3 and 31 are pressed toward the rotating shaft 10A by the fixing members 4 and 41, when the cylindrical members 3 and 31 are fixed by the fixing members 4 and 41, To suppress the force pushing the rotary shaft 10A in the axial direction. As a result, according to the knob structure of the embodiment, it is possible to reduce the axial load on the rotary shaft 10A during attachment. The electronic component 10 has a specified maximum load capacity in the axial direction along which the central axis C of the rotating shaft 10A extends, and the knob structure of the embodiment can prevent the maximum load capacity from being exceeded. Further, according to the knob structure of the embodiment, since the load in the axial direction to the rotating shaft 10A can be reduced during attachment, the fixed members 4 and 41 press the cylindrical members 3 and 31 toward the rotating shaft 10A. can be maintained attached to the rotary shaft 10A.

In the knob structure of the embodiment, the cylindrical member 3 is formed with a male screw groove 3C, the fixing member 4 is formed with a female screw groove 4B that engages with the male screw groove 3C, and the fixing member 4 is screwed into the tubular member 3. A pressing force is applied to the rotating shaft 10A. Therefore, according to the knob structure of the embodiment, the pressing force is generated by the fixing member 4 separately from the insertion of the rotating shaft 10A of the cylindrical member 3. As shown in FIG. As a result, according to the knob structure of the embodiment, it is possible to reduce the load in the axial direction on the rotary shaft 10A during attachment, and to maintain the state of attachment to the rotary shaft 10A.

In addition, in the knob structure of the embodiment, the fixing member 41 applies a pressing force to the rotating shaft 10A to the cylindrical member 31 by elastic force. Therefore, according to the knob structure of the embodiment, the pressing force is generated by the fixing member 41 separately from the insertion of the rotating shaft 10A of the cylindrical member 31. As shown in FIG. As a result, according to the knob structure of the embodiment, it is possible to reduce the load in the axial direction on the rotary shaft 10A during attachment, and to maintain the state of attachment to the rotary shaft 10A.

In the knob structure of the embodiment, the knob body 2 has a recess 2B in which the cylindrical members 3 and 31 are arranged and the fixing members 4 and 41 are accommodated. 5. Therefore, according to the knob structure of the embodiment, by covering the cylindrical members 3 and 31 and the fixed members 4 and 41 with the cover member 5, they can be prevented from being seen outside and the appearance can be improved.

Further, the knob mounting method of the embodiment includes a step of inserting the rotary shaft 10A into cylindrical members 3, 31 formed in the knob body 2 and having flexibility in the radial direction; pressing the cylindrical members 3 and 31 toward the rotary shaft 10A by the fixing members 4 and 41; include. Therefore, according to the knob mounting method of the embodiment, before the cylindrical members 3 and 31 are pressed toward the rotating shaft 10A by the fixing members 4 and 41, the cylindrical member 3 is fitted to the rotating shaft 10A. To suppress the force pushing 10A in the axial direction. As a result, according to the knob mounting method of the embodiment, it is possible to reduce the axial load on the rotary shaft 10A during mounting. The electronic component 10 has a specified maximum load capacity in the axial direction along which the central axis C of the rotary shaft 10A extends, and the knob attachment method of the embodiment prevents the maximum load capacity from being exceeded. Further, according to the knob mounting method of the embodiment, since the load in the axial direction to the rotating shaft 10A can be reduced during mounting, the cylindrical members 3 and 31 are pressed toward the rotating shaft 10A by the fixing members 4 and 41. There is no need to suppress the action, and the state of attachment to the rotating shaft 10A can be maintained. According to the knob mounting method of the embodiment, since the pressing force is generated by the fixing members 4 and 41 separately from the insertion of the rotating shaft 10A into the tubular members 3 and 31, the load in the axial direction to the rotating shaft 10A is reduced during attachment. can be reduced, and the state of attachment to the rotating shaft 10A can be maintained.

Reference Signs List 1, 11 Knob 2 Knob main body 2B Recess 3 Cylindrical member 3C Male thread groove 4 Fixed member 4B Female thread groove 5 Cover member 10A Rotating shaft 31 Cylindrical member 41 Fixed member

Claims (5)

a knob body formed with a tubular member that is radially flexible and allows the rotary shaft to be inserted in the axial direction;
a fixing member that is attached to the outer periphery of the cylindrical member from the distal end side of the rotating shaft and presses the cylindrical member toward the rotating shaft;
A knob structure. The cylindrical member is formed with a male thread groove, the fixing member is formed with a female thread groove that meshes with the male thread groove, and the fixing member is screwed to apply a pressing force to the rotating shaft to the cylindrical member. The knob structure according to claim 1. 2. The knob structure according to claim 1, wherein said fixing member applies a pressing force to said cylindrical member against said rotating shaft by means of elastic force. 4. The knob body according to any one of claims 1 to 3, wherein the knob body has a recess in which the cylindrical member is arranged and the fixing member is accommodated, and further comprising a cover member that covers the recess and is attached to the knob body. Knob structure described in . a step of axially inserting the rotating shaft through a radially flexible cylindrical member formed in the knob body;
a step of pressing the cylindrical member toward the rotating shaft by a fixing member attached to the outer periphery of the cylindrical member from the distal end side of the rotating shaft;
attaching a cover member to the knob body to cover the cylindrical member and the fixed member;
Knob mounting method, including.

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