JP2007157390A - Knob - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knob on which a slit is formed, and it is easy to fit a boss clamped by an elastic ring member into a shaft with a tip part made in a D-cut shape. <P>SOLUTION: The knob includes a dial part 10, and a hollow boss 20 protruded from the dial part 10 insertion-coupled with a shaft 200 with a D-cut shape with a part of the peripheral face continued from the tip face to be a flat face, with a rest face 21 formed in the boss 20 for receiving a flat face 210 of the shaft 200, a slit 22a (22b) extended from its open end is formed at the boss 20, and with a given site with the slit 22a (22b) of the boss 20 formed so made to be clamped from outside by the elastic ring member 30. The boss 20 is so structured to have a pair of guide grooves 23a, 23b formed on the inside face and guiding the flat face 211 of the shaft 200 from its open tip toward the rest face 21 almost in parallel with the rest face 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation knob that is fitted to a shaft of a component such as a switch or a volume.

  An operation knob that is fitted to a shaft of a component such as a switch or a volume generally has a knob portion to be operated, and a hollow boss that protrudes from the knob portion and has a distal end opened to fit the shaft. It has a structure. In such a knob, the boss is formed with a pair of slits extending from the open tip, and a predetermined portion of the boss where the pair of slits are formed is tightened from the outside by an elastic ring member (ring-shaped spring). Has been proposed (see, for example, Patent Document 1). In such a knob, the boss split in the longitudinal direction by the pair of slits is tightened by the elastic ring member while being expanded in the radial direction by the fitting of the shaft, so that a necessary removal force can be obtained. It becomes like this.

Further, in order to prevent the knob (boss) fitted to the shaft from spinning when the knob (knob portion) is rotated, for example, a part of the circumferential surface continuing from the front end surface of the shaft is a flat surface. A so-called D-cut shape is formed, and a receiving surface for receiving the flat surface is formed in the boss so that the shaft is fitted in the boss (for example, see Patent Document 2). According to such a knob, when the knob is rotated, the receiving surface in the boss comes into contact with the flat surface of the shaft, and the idling of the knob is prevented.
Japanese Utility Model Publication No.59-173303 Japanese Utility Model Publication No. 51-14755

  By the way, as described above, a pair of slits extending from the front end of the boss to which the D-cut shaft with a part of the peripheral surface extending from the front end surface is a flat surface is formed, and the pair of the bosses are formed. It is conceivable to tighten the predetermined portion where the slit is formed by an elastic ring member from the outside. In this case, it is difficult to fit the knob into the shaft for the following reason.

  Usually, due to a demand on the appearance, a boss fitted to the shaft is made invisible from the outside by a panel or a knob portion of a device on which a component having the shaft is installed. For this reason, after the boss is fitted to the shaft, the boss cannot be tightened with the elastic ring member. The boss formed with the slit is previously tightened by the elastic ring member, and the boss is formed in the D-cut shape. Will be fitted into the shaft.

  However, since the boss is tightened by the elastic ring member in advance, the inner diameter of the boss is slightly reduced, and when the boss with the reduced inner diameter is fitted into the D-shaped shaft, The corner portion of the D-cut shape portion that becomes a flat surface hits the tip edge that the boss opens, and it is difficult to perform the fitting operation at the appropriate position. In particular, when such a knob is inserted into a thin shaft of a small component, the operation is difficult.

  The present invention has been made to solve such a problem, and has a D-cut shape in which a slit is formed and a boss clamped by an elastic ring member continues from the tip surface part of the peripheral surface to be a flat surface. The present invention provides a knob that can be easily fitted into a shaft.

  The knob according to the present invention has a knob portion, and a hollow boss that protrudes from the knob portion and fits into a D-cut shaft that has a flat part of the peripheral surface that continues from the tip surface. A receiving surface for receiving the flat surface of the shaft is formed in the boss, and a slit extending from an open tip is formed in the boss, and a predetermined portion of the boss where the slit is formed is tightened by an elastic ring member from the outside. A pair of guides that are formed on the inner surface of the knob and guide the flat surface of the shaft toward the receiving surface substantially parallel to the receiving surface from the open tip. It becomes the structure which has a groove | channel.

  With such a configuration, an inner surface of a boss formed with a receiving surface for receiving the flat surface of a D-cut shaft in which a part of a peripheral surface continuing from the front end surface is a flat surface is formed on the inner surface of the shaft from the open front end. Since a pair of guide grooves for guiding the flat surface toward the receiving surface substantially parallel to the receiving surface is formed, the bosses are formed so that both corners of the flat surface of the shaft are along the pair of guide grooves. Is inserted into the shaft, so that both corners of the flat surface of the shaft are guided without being caught by the leading edge of the boss, and the boss is inserted into the shaft so that the receiving surface receives the flat surface. Will be able to. And in the state where the boss is completely fitted to the shaft, the boss that is split in the longitudinal direction by the slit will be tightened from the outside by the elastic ring member even if it tries to expand in the radial direction by the shaft. It becomes possible to obtain a strong removal force.

  In the knob according to the present invention, the pair of guide grooves can be shorter than the slit.

  With such a configuration, when the boss is fitted into the shaft, the D-cut shape portion that becomes the flat surface of the shaft is guided by the pair of guide grooves, and then the longitudinal direction by the slit in the D-cut shape portion of the shaft. Thus, it is possible to effectively apply a force to expand the boss divided in the radial direction.

  Moreover, the knob which concerns on this invention WHEREIN: The said elastic ring member can be set as the structure provided in the predetermined | prescribed site | part of the said knob part side from the terminal vicinity vicinity of the said pair of guide groove of the said boss | hub.

  With such a configuration, the portion where the pair of guide grooves is formed can eliminate the tightening by the elastic ring member, so that the boss while the both corners of the flat surface of the D-cut shape portion of the shaft is along the pair of guide grooves. It becomes possible to perform the operation of fitting the shaft into the shaft more easily.

  In the knob according to the present invention, the pair of guide grooves may be formed so that the depth thereof gradually becomes shallower from the distal end where the boss opens.

  With such a configuration, when the boss is fitted into the shaft, the D-cut shaped portion of the shaft tends to gradually expand the boss that has been split in the longitudinal direction by the slit. There is little initial resistance when fitting. For this reason, the boss can be easily fitted into the shaft.

  In the knob according to the present invention, the boss may have a pair of slits formed so as to extend along a predetermined virtual plane that is substantially perpendicular to the receiving surface.

  With such a configuration, the boss is divided into two in the longitudinal direction by the pair of slits, so that a force to spread the boss in a balanced manner by the shaft fitted along the pair of guide grooves acts. To be able to. Further, by positioning the boss with respect to the shaft such that any one of the pair of slits extending along a virtual plane that is substantially perpendicular to the receiving surface faces the flat surface of the shaft, both corners of the flat surface are Since it is positioned in the pair of guide grooves, the work of fitting the boss into the shaft can be made easier.

  Moreover, the knob which concerns on this invention WHEREIN: It can be set as the structure by which the mark part was formed in the site | part on the virtual surface which becomes substantially perpendicular | vertical to the said receiving surface in the side which the said boss | hub of the said knob part protrudes.

  With such a configuration, the virtual surface on which the mark member is formed is substantially perpendicular to the receiving surface of the boss, so that the flat surface of the shaft faces the mark member or the D-cut shape portion of the shaft By positioning the boss at the tip of the shaft so that the portion opposite to the flat surface faces the mark member, both corners of the flat surface are positioned in a pair of guide grooves. The member becomes a standard for fitting the boss into the shaft, and the work can be made easier.

  According to the knob of the present invention, the both corners of the flat surface of the shaft are bosses by fitting the boss into the shaft so that both corners of the flat surface of the D-cut shape portion of the shaft are along a pair of guide grooves. Since the boss can be fitted into the shaft without being caught by the open end edge of the shaft, the boss formed with a slit and tightened by the elastic ring member is fitted into the shaft having a D-cut shape. It becomes easy to do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A knob according to an embodiment of the present invention is configured as shown in FIGS. 1 is a plan view of the knob as viewed from above the knob portion (a), a first side view (b) of the knob, a second side view (c) of the knob, and a plan view (a). FIG. 2A is a cross-sectional view taken along the line AA along the first virtual plane P1, and FIG. 2 is a rear view when the knob is viewed from below the knob and a second virtual plane P2 of the knob. It is CC sectional drawing (b) which was made.

  1 and 2, the knob 100 has a structure in which a knob portion 10 and a hollow boss 20 are integrally formed of a synthetic resin such as ABS or polycarbonate. The knob portion 10 is formed in a cap shape by a substantially disk-shaped front surface portion 11 whose outer surface is slightly curved, and a skirt portion 12 erected from the peripheral edge portion of the front surface portion 11. The boss 20 protrudes from a substantially central portion of the inner surface of the front surface portion 11 of the knob portion 10 and extends further outward from the peripheral edge of the skirt portion 12.

  On the inner surface of the knob portion 10, four ribs 25a, 25b, 25c, and 25d that stand on the inner surface of the front surface portion 11 and connect the inner surface of the skirt portion 12 and the outer surface of the boss 20 are formed. Further, longitudinal ribs 26 a, 26 b, 26 c, and 26 d extending so as to rise along the outer surface of the boss 20 from the joint portions between the ribs 25 a, 25 b, 25 c, and 25 d and the boss 20 are formed. The ribs 25a to 25d and the longitudinal ribs 26a to 26d reinforce the boss 20 standing on the inner surface of the front surface portion 11.

  The boss 20 has a substantially cylindrical hollow portion extending from the open tip, and receives the flat surface of the D-cut shaft in which a part of the peripheral surface continuing from the tip surface becomes a flat surface as will be described later. A receiving surface (flat surface) 21 is formed. Further, as shown in FIG. 5 together with FIGS. 1 and 2, the inner surface of the boss 20 passes along the first virtual plane P <b> 1 that passes through the maximum diameter position (diameter position) of the boss 20 and is substantially parallel to the receiving surface 21. A pair of guide grooves 23a and 23b extending in the direction is formed. The position through which the first virtual surface P1 passes in the boss 20 is set according to the position of the receiving surface 21 in the boss 20. Also, the boss 20 is formed with a pair of slits 22a and 22b extending along a second imaginary plane that passes through the maximum diameter position (diameter position) and is substantially perpendicular to the receiving surface 21 (first imaginary plane P1). ing.

  Each slit 22a, 22b is a boss, as shown in an enlarged manner in FIGS. 3 and (enlarged sectional view of portion B in FIG. 1 (c)) and FIG. 4 (enlarged sectional view of portion D in FIG. 2 (b)). 20 extends slightly beyond the position where the leading ends of the longitudinal ribs 26a to 26d reach from the open tip. Each guide groove 23a, 23b extends from the open end of the boss 20 to the back as shown in an enlarged manner in FIGS. 3 and 4, and its length is shorter than each slit 22a, 22b. Each of the guide grooves 23a and 23b is formed so that the depth thereof gradually becomes shallower from the opening end of the boss 20. In addition, it is preferable that the end of each guide groove 23a and 23 formed so that it may become shallow gradually from the front-end | tip which the boss | hub 20 open | closes to the inner wall (inner surface) of the boss | hub 20 without a level | step difference.

  As shown in FIGS. 3 and 5 together with FIG. 1, protrusions 24 a and 24 b are formed on the outer peripheral surface of the boss 20 corresponding to the portions where the guide grooves 23 a and 23 b are formed. A metal ring-shaped leaf spring is provided at a portion between the end of each projection 24a, 24b of the boss 20 (corresponding to the vicinity of the end of each guide groove 23a, 23b) and the tip of each longitudinal rib 26a-26d. An elastic ring member 30 formed of, for example, is wound. In other words, the tip portions of the boss 20 where the slits 22 a and 22 b are formed are not fastened by the elastic ring member 30 and the projections 24 a and 24 b of the boss 20 are tightened. A portion on the knob portion 10 side (a portion between the protrusions 24 a and 24 b and the tips of the longitudinal ribs 26 a to 26 d) is fastened by the elastic ring member 30.

  As shown in FIG. 2, the mark part 27 is formed so that it may protrude from the inner surface part of the skirt part 11 facing one slit 22b of the boss | hub 20. As shown in FIG. As described above, the mark portion 27 is located on the second virtual surface P2 that is substantially perpendicular to the first virtual surface P1 extending along the pair of guide grooves 23a and 23b, and is substantially parallel to the first virtual surface P1. This represents the position of the receiving surface 21 formed in the boss 20.

  As shown in FIG. 6, the knob 100 having the above-described structure is configured such that the boss 20 is fitted into the shaft 200 formed with the D-cut shape portion 210 in which a part of the peripheral surface continuing from the tip surface becomes the flat surface 211. Thus, the shaft 200 is attached. Specifically, the knob 100 is oriented so that the mark portion 27 (see FIG. 2) faces the flat surface 211 of the D-cut shape portion 210 of the shaft 200. As a result, the flat surface 211 of the shaft 200 becomes substantially parallel to the receiving surface 21 in the boss 20. In this state, as shown in FIG. 6, the boss 20 is fitted into the shaft 200 with both corners 212a and 212b of the flat surface 211 of the D-cut shaped portion 210 of the shaft 200 aligned with the pair of guide grooves 23a and 23b. Then, the boss 20 is fitted into the shaft 200 while the flat surface 211 of the shaft 200 is guided toward the receiving surface 21 substantially parallel to the receiving surface 21 in the boss 20 by the pair of guide grooves 23 a and 23 b. The boss 20 is fitted to the shaft 200 in a state where the receiving surface 21 in the boss 20 is in contact with (received) the flat portion 211 of the D-cut shaped portion 210 of the shaft 200.

  According to the knob 100 as described above, even if the inner diameter of the boss 20 divided into two by the pair of slits 22a and 22b is slightly shrunk by tightening the elastic ring member 30, as shown in FIG. At the open tip, the inner diameter at the maximum diameter position where the pair of guide grooves 23a and 23b oppose (the first virtual plane P1 in FIG. 5 passes) is increased by the depth of each guide groove 23a and 23b. . For this reason, when the both corners 212a and 212b of the flat surface 211 in the D-cut shape portion 210 of the shaft 200 are aligned with the guide grooves 23a and 23b of the boss 20, the corners 212a and 212b are the leading edges of the boss 20 that are open. The boss 20 can be easily fitted into the D-cut shaped portion 210 of the shaft 200. That is, it becomes easy to fit the boss 20 fastened by the elastic ring member 30 into the shaft 200 having a D-cut shape.

  Further, the tip portions of the boss 20 where the protrusions 24 a and 24 b are formed (the portions where the guide grooves 23 a and 23 b are formed) are not tightened by the elastic ring member 30. For this reason, when the boss 20 is fitted into the D-cut shaped portion 210 of the shaft 200, the tip end portion of the boss 20 divided by the pair of slits 22a and 22b is easy to expand, and the guide groove 23a that guides the shaft 200 as described above. , 23 b, the inner diameter of the boss 20 is formed wider than the width of the D-cut shaped portion 210 of the shaft 200, and the boss 20 is fitted into the D-cut shaped portion 210 of the shaft 200. Work becomes easier. In a state where the receiving surface 21 receives the flat surface 211 in the D-cut shape portion 210 of the shaft 200 and the boss 20 is completely fitted to the shaft 200, the boss 20 that is split in the longitudinal direction by the pair of slits 22a and 22b. Even if the shaft 200 is expanded in the radial direction by the shaft 200, the elastic ring member 30 is tightened from the outside, so that a necessary removal force can be obtained.

  Each guide groove 23a, 23b is formed so that its depth gradually becomes shallower from the open end of the boss 20, so that when the boss 20 is fitted into the shaft 200, the D-cut shape of the shaft 200 is formed. The portion 210 causes the boss 20 that has been split in the longitudinal direction by the slits 22a and 22b to gradually expand. Therefore, there is little initial resistance when the boss 20 is fitted into the shaft 200, and the boss 20 can be easily fitted into the shaft 200.

  Furthermore, since the first virtual surface P1 along which the pair of guide grooves 23a and 23b extends and the second virtual surface P2 along which the pair of slits 22a and 22b extend are substantially perpendicular (see FIG. 5), the pair of slits 22a and 22b Thus, it is possible to apply a force to spread the boss 20 divided in the longitudinal direction in a balanced manner by the D-cut shape portion 210 of the shaft 200 fitted along the pair of guide grooves 23a and 23b. .

  In the above-described example, the pair of slits 22a and 22b are formed in the boss 20. However, it is also possible to form a single slit or three or more slits. However, as described above, from the viewpoint that it is possible to apply a force to spread the boss 20 in a balanced manner by the D-cut shape portion 210 of the shaft 200 fitted along the pair of guide grooves 23a and 23b. As described above, it is preferable to form the pair of slits 22 a and 22 b in the boss 20.

  In the above-described example, the mark portion 27 is formed on the inner surface portion of the skirt portion 11 in the knob portion 10 so as to face the one slit 22 b formed in the boss 20. It can also be formed on the inner surface portion of the skirt portion 11 so as to face the slit 22b. In this case, the orientation of the knob 100 is adjusted so that the mark portion 27 faces the top of the curved surface of the D-cut shaped portion 210 of the shaft 200. It is also possible not to form the mark portion 27. In this case, the flat surface 211 of the D-cut shaped portion 210 of the shaft 200 faces the slit 22b formed in the boss 20 or the top of the curved surface of the D-cut shaped portion 210 of the shaft 200 is the boss 20. What is necessary is just to adjust the direction of the knob 100 so that the slit 22a formed in this may be opposed.

  Further, the mounting portion of the elastic ring member 30 to the boss 20 is not limited to a predetermined portion on the knob portion 10 side from the vicinity of the end of the pair of guide grooves 23a and 23b of the boss 20 as in the above-described example, and the pair of guide grooves 23a. , 23b may be formed. However, as described above, from the viewpoint of easy work of fitting the boss 20 into the shaft 200, the ends of the projections 24a and 24b of the boss 20 (corresponding to the vicinity of the end of the guide grooves 23a and 23b) It is preferable to attach the elastic ring member 30 to a portion between each of the vertical ribs 26a to 26d.

  In the above-described example, the pair of guide grooves 23 a and 23 b are formed so as to extend along the first virtual surface P <b> 1 that passes through the maximum diameter position (diameter position) of the boss 20 and is substantially parallel to the receiving surface 21. However, the position is not limited to the first virtual plane P1, but is set according to the position of the receiving surface 21 in the boss 20, that is, the shape of the D-cut shape portion 210 of the shaft 200 to be fitted to the boss 20. A pair of guide grooves 23a, 23b can be formed on the inner surface of the boss 20 along a virtual plane passing through the position.

  As described above, the knob according to the present invention has an effect that it is easy to fit a boss formed with a slit and tightened by an elastic ring member into a shaft having a D-shaped tip. It is useful as a knob for operation to be fitted to the shaft of parts such as switches and volumes.

The top view (a) which looked at the knob concerning one embodiment of the present invention from the upper part of a knob part, the 1st side view (b) of the knob, the 2nd side view (c) of the knob, and the top view It is AA visual field sectional drawing (d) cut | disconnected in the 1st virtual surface in (a). It is CC sectional drawing cut | disconnected by the 2nd virtual surface P2 of the rear view (a) which looked at the knob which concerns on one Embodiment of this invention from the downward direction of the knob part, and this knob. It is an expanded sectional view which shows the detail of the B section of FIG.1 (c). FIG. 3 is an enlarged cross-sectional view illustrating details of a D portion in FIG. It is a perspective view which expands and shows the front-end | tip part of the boss | hub in a knob. It is a perspective view which shows the relative positional relationship of the shaft and boss | hub at the time of fitting a knob in a shaft. It is a schematic diagram which shows the relationship between the front-end | tip part used as the D cut shape of a shaft at the time of fitting a knob to a shaft, and a pair of guide groove formed in the boss | hub.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Knob part 11 Front part 12 Skirt part 20 Boss 21 Receiving surface 22a, 22b Slit 23a, 23b Guide groove 24a, 24b Protrusion part 25a, 25b, 25c, 25d Rib 26a, 26b, 26c, 26d Vertical direction rib 27 Mark part 30 Elastic ring member 100 Knob 200 Shaft 210 D-cut shape portion 211 Flat surface 212a, 212b Corner portion

Claims (6)

A hollow boss that fits into a D-cut shaft that protrudes from the knob and protrudes from the knob and has a part of a peripheral surface that is flat from the tip. The flat surface of the shaft is in the boss. And a slit extending from the open tip of the boss, and a predetermined portion of the boss where the slit is formed is tightened by an elastic ring member from the outside. And
The boss has a pair of guide grooves formed on the inner surface thereof for guiding the flat surface of the shaft from the open tip toward the receiving surface substantially parallel to the receiving surface. .   The knob according to claim 1, wherein the pair of guide grooves are shorter than the slit.   3. The knob according to claim 2, wherein the elastic ring member is provided at a predetermined portion on the knob portion side from the vicinity of the end of the pair of guide grooves of the boss.   4. The knob according to claim 1, wherein the pair of guide grooves are formed so that a depth thereof gradually becomes shallower from a tip of the boss opened. 5.   The knob according to any one of claims 1 to 4, wherein the boss has a pair of slits formed so as to extend along a virtual plane that is substantially perpendicular to the receiving surface. The knob according to any one of claims 1 to 5, wherein a mark portion is formed at a portion on a virtual surface that is substantially perpendicular to the receiving surface on the side of the knob portion where the boss protrudes.

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