JP2005282705A - Leg structure and electronic equipment equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leg structure for restricting a natural frequency to be transmitted, easy in selection and machining of a material, by using a construction having a degree of freedom in vertical and lateral directions. <P>SOLUTION: The leg structure comprises a first leg portion, a second leg portion, a plurality of position holding members for holding the position of the first leg portion relative to the second leg portion in a preset range, and a spherical body held between the first leg portion and the second leg portion. An approximately domed recessed portion is provided in at least one of the faces of the first leg portion and the second leg portion on the side of holding the spherical body therebetween. When loaded, the spherical body is located in the range of the recessed portion and put in point contact with each of the first leg portion and the second leg portion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a leg structure for receiving a device, and more particularly to a leg structure capable of limiting a natural vibration frequency during use for an acoustic device, a measuring device, or the like that requires a vibration isolation effect.

  Usually, the bottom surfaces of acoustic devices, measuring devices, etc. are placed directly on the installation surface on which they are installed, or are placed horizontally with respect to the installation surface by a plurality of leg structures having a predetermined plane. . Conventionally, the plurality of leg structures are made of, for example, cylindrical soft rubber or synthetic resin having a low height.

  Since the conventional leg structure having such a structure has a large contact area with the installation surface as the above-mentioned cylinder area, for example, it is a structure that easily transmits acoustic vibrations in a wide frequency range. There has been a problem that the vibration of the device is transmitted to the other through the installation surface, or conversely, the vibration of another vibration source such as mechanical vibration is transmitted to the device.

  For example, as seen in Patent Document 1, such a problem is caused by the bottom foot body in which the opening and the bottomed recess that extends from the opening toward the inside are formed, and the bottom of the recess is inserted into the bottomed recess. This can be reduced to some extent by using a bottom foot including a tip portion that makes point contact and a tapered support column having a ring-shaped groove that engages with the peripheral edge portion of the opening.

Japanese Utility Model Publication No. 4-90097

  However, the method of receiving the tapered support by point contact requires high accuracy when processing the support, and the ring-shaped groove is also processed, so the processing is complicated and the material of the support is limited There is a problem of being done. In addition, since the ring-shaped groove and the bottom foot main body are engaged with the opening, the lateral movement of the column is restricted, and the height of the entire bottom foot can be managed by the gap between the groove and the opening. There is a problem that it is difficult. Further, although the bottom foot body and the support are in point contact, there is a problem in that vibration cannot be sufficiently damped between the support and the electrical device because the support and the electrical device are in surface contact.

  Accordingly, an object of the present invention is to provide a leg structure that can easily select and process a material and can limit a natural vibration frequency to be transmitted by using a structure having a degree of freedom in a height direction and a lateral direction. It is to be.

  In order to achieve this object, the present invention provides a first leg, a second leg, and a relative relationship between the first leg and the second leg as described in claim 1. A leg structure including a plurality of position holding members that hold positions within a predetermined range, and a sphere sandwiched between the first leg and the second leg, wherein the first leg A substantially dome-shaped recess is provided on at least one of the surface of the first leg and the second leg sandwiching the sphere, and when the load is applied, the sphere is located within the range of the recess and A point contact is made with each of the first leg and the second leg. According to such a configuration, since the first leg and the second leg are in a two-point contact via a sphere, the natural vibration frequency transmitted through both legs is limited, and vibrations from other vibration sources are generated. Can be suppressed.

  In the leg structure according to claim 1, for example, as in claim 2, the plurality of position holding members are fixed to one of the first leg and the second leg, When no load is applied to the leg structure, the first leg and the second leg are brought into contact with one of the first leg and the second leg that is not fixed. When the load is applied to the leg structure while maintaining the positional relationship with the leg, the non-fixed one of the first leg and the second leg is not in contact with the leg structure. You may comprise as follows.

  In the leg structure according to claim 1 or 2, for example, as described in claim 3, the plurality of position holding members are rod-shaped and fixed to one of the first leg and the second leg. In addition, it may be configured to restrict a range of relative movement of the first leg portion and the second leg portion by being positioned inside the opening provided on the other side.

  According to a third aspect of the present invention, in the leg structure according to the fourth aspect, for example, the plurality of position holding members may be fixed to one of the first leg and the second leg. The intermediate portion and a bottom surface portion having a cross-sectional area larger than the cross-sectional area of the intermediate portion, and the plurality of position holding members among the first leg portion and the second leg portion; On the other side that is not fixed, a plurality of two-stage through-holes corresponding to the shapes of the intermediate portion and the bottom portion and slightly larger than the shapes of the intermediate portion and the bottom portion are provided. A position holding member is inserted into the two-stage through hole, and the bottom surface portion comes into contact with the step portion of the two-stage through hole, thereby allowing a relative movement range of the first leg portion and the second leg portion. You may comprise so that it may regulate.

  The leg structure according to any one of claims 1 to 4, wherein the first leg portion and the second leg portion are arranged between the first leg portion and the second leg portion. An interval adjusting member of an elastic body that sets the interval between the leg portion and the second leg portion within a predetermined range is sandwiched, and the interval adjusting member is a position where the spherical body and the plurality of position holding members are arranged. A plurality of openings, and when the load is not applied to the leg structure, the spacing adjusting member maintains a positional relationship between the first leg and the second leg. When a load is applied to the leg structure, the sphere may be deformed so as to make point contact with each of the first leg and the second leg.

  The leg structure according to any one of claims 1 to 5 is attached to and installed in either one of the first leg and the second leg, for example, as in claim 6. You may comprise so that it may have a bottom face member which contacts a plane.

  According to a seventh aspect of the present invention, there is provided an electronic apparatus comprising the plurality of leg structures according to any one of the first to sixth aspects on the same bottom surface portion. Also good. With such a configuration, the vibration frequency transmitted to the device or the vibration frequency transmitted from the device is limited to the natural vibration frequency of the leg structure while maintaining the flatness from the bottom surface of the electronic device. It becomes possible to do.

  ADVANTAGE OF THE INVENTION According to this invention, the leg part structure which can limit the natural vibration frequency transmitted can be implement | achieved by using the support structure which has the freedom degree of a height direction and a horizontal direction, and carries out a point contact inside.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing the structure of the leg structure 1 in the present embodiment. The leg structure 1 includes a columnar upper leg 2 as a first leg, a sphere 4, a columnar spacing adjustment member 5, and a columnar lower leg 7 as a second leg. The structure has three position holding members 9a, 9b, 9c that hold the relative positions of the upper leg portion and the lower leg portion within a predetermined range, and a bottom face portion 10 that contacts the installation surface and absorbs an impact. .

  The upper leg 2 has three female screw holes 3a, 3b, and 3c that are concentrically circumferentially inserted into and fixed to a part of the position holding members 9a, 9b, and 9c. The spacing adjusting member 5 has three through holes having a through hole 5a larger than the diameter of the sphere 4 at the center and a diameter larger than the female screw holes 3a, 3b, 3c and the center axis being the same as each female screw hole. 6a, 6b, 6c. The lower leg 7 has a concave portion 7a (not shown) having a substantially inverted dome shape at the center of the upper surface, has the same central axis as the through holes 6a, 6b and 6c, and has three different diameters at predetermined positions. It has through holes 8a, 8b, 8c. At this time, the diameter of the sphere 4 is assumed to be sufficiently larger than the depth from the upper surface of the lower leg portion of the concave portion 7a, and the sphere 4 is largely outside the range of the concave portion 7a and the upper leg portion 2 and the lower leg portion 7 As the distance between the two becomes smaller, point contact is made with the bottom surface of the upper leg 2. The three position holding members 9a, 9b, and 9c have a male screw portion that meshes with a female screw cut in the female screw hole 3a, an intermediate portion that has a slightly smaller diameter than the through hole 5a, and a little larger than the larger one of the two-stage through holes. It has a bottom surface with a small diameter. In FIG. 1, the male screw part and the intermediate part have a configuration in which the cross-sectional area of the intermediate part is larger than the cross-sectional area of the male screw part, but the cross-sectional area of the intermediate part is small or the cross-sectional areas of the male screw part and the intermediate part are the same. May be.

  The upper leg 2 and the lower leg 7 are made of a metal material such as brass or stainless steel, which is easy to machine, and the sphere 4 is similarly easy to machine the upper leg 2 and the lower leg. 7 is made of a metal material that is the same as or slightly high in strength, and is made of a material such as chrome steel, glass, ceramic, brass, and tungsten carbide. The spacing adjusting member 5 is made of an elastic material such as silicon rubber, and is fixed to the upper leg portion 2 and the lower leg portion 7 by a method such as adhesion. The position holding members 9a, 9b, 9c are made of a general screw material or the like. As described above, the bottom surface portion 10 is made of a material suitable for absorbing an impact with the installation surface, for example, a general-purpose rubber material.

  The position holding members 9a, 9b, and 9c pass through the corresponding through holes 6a, 6b, and 6c and the two-stage through holes 8a, 8b, and 8c, and are screw-engaged with the female screw holes 3a, 3b, and 3c. It has the function of contacting the step portion of the two-stage through hole and maintaining the vertical position within a predetermined range. Thereby, the leg structure 1 of the present embodiment is integrated by engaging the lower leg portion 7 and the position holding members 9a, 9b, 9c even when only the upper leg portion 2 is lifted, for example. , Easy to carry and carry. As will be described later, the position holding members 9a, 9b, and 9c also have a function of holding the lateral position of the leg structure 1 within a predetermined range when a load is applied in the vertical direction. The sphere 4 is in a space formed by the bottom surface of the upper leg 2, a through hole 5 a provided in the distance adjusting member 5, and a recess 7 a (described later in FIG. 2) provided in the lower leg 7. It is arranged in a free state. The bottom surface portion 10 is fixed to the bottom surface of the lower leg portion 7 by fixing means such as an adhesive.

  FIG. 2 is a cross-sectional view cut along a cross section passing through the center of the leg structure 1 in the present embodiment, and FIG. 2A shows a state in which no load is applied to the leg structure 1. (B) has shown the state by which the load is applied to at least one of the upper surface of the leg structure 1, and the lower surface. The leg structure 1 according to this embodiment is coupled by three position holding members as shown in FIG. 1, but in FIGS. 2 (a) and 2 (b), one of the three position holding members. The mode of the cross section in the surface which passes along the centerline of 9a and the centerline of the leg part structure 1 is shown. As shown in FIG. 2A, in the leg structure 1, the position holding member 9a meshed with the upper leg portion passes through the distance adjusting member 5 and the lower leg portion 7, and the bottom portion of the position holding member 9a is the lower leg portion. 7, the vertical positions of the upper leg 2, the cushioning material 5, and the lower leg 7 are maintained within a certain range. The distance adjusting member 5 is fixed to at least one of the upper leg 2 and the lower leg 7, and is compressed when a load is applied to the leg structure 1, and the upper leg 2 and the lower leg 7 are compressed. When the load is not applied, the distance between the upper leg 2 and the lower leg 7 is maintained within a predetermined range.

  The position holding member 9a is screw-engaged, that is, meshed with a female screw hole 3a in which a female screw is cut in advance in a portion indicated by a region X in the drawing. Further, the position holding member 9a is arranged so as not to contact with the through hole 6a of the interval adjusting member 5 and the two-stage through hole 8a of the portion indicated by the region Y with a predetermined gap. As described above, the sphere 4 is in a space formed by the bottom surface of the upper leg 2, the through hole 5 a provided in the distance adjusting member 5, and the substantially inverted dome-shaped recess 7 a provided in the lower leg 7. It is stored freely. At this time, the sphere 4 is stopped at the position of the deepest portion of the recess 7a in the normal state shown in FIG. Furthermore, a female screw is cut in the concave portion 2b provided on the upper surface of the upper leg portion 7, and is used, for example, when the screw is engaged with a male screw convex portion provided in the audio equipment body.

  As shown in FIG. 2 (b), when a load is applied to at least one of the upper surface and the lower surface of the leg structure 1, the upper leg 2 is pushed downward in the drawing, and the position is accordingly increased. The position of the holding member 9a is also lowered. At this time, the position holding member 9a is coupled to the upper leg portion 2 via screws, but is not coupled to the gap adjusting member 5 and the lower leg portion 7 as described above. Move away from contact with the part 7. Further, since the distance adjusting member 5 is made of an elastic material, the thickness of the distance adjusting member 5 is reduced by the amount that the position holding member 9a is moved downward. As shown in FIG. The member 5 is deformed into a convex shape in the lateral direction. Accordingly, the sphere 4 that is movable in the space formed by the lower surface of the upper leg 2, the concave portion 7 a and the through hole 5 a has a smaller distance between the upper leg 2 and the lower leg 7, so that the upper leg Point contact is made at point P1 with the part 2 and at point P2 with the lower leg part 7 respectively. Thereby, the space | interval adjustment member 5 does not become thin any more, but the height of the leg part structure 1 whole is fixed.

  When configured and operated as described above, the gap adjusting member 5 and the bottom surface portion 10 absorb vibrations and do not transmit large vibrations. It is transmitted only via the points P1 and P2. In other words, the configuration of the present embodiment has a remarkably small vibration transmission area, so that the transmitted vibration frequency can be only the natural vibration frequency of the material of the upper leg portion 2, the lower leg portion 7 and the sphere 4. .

  Further, as described above, the height of the leg structure 1 is such that the thickness at the contact point of the upper leg 2, the thickness at the contact point of the lower leg 7, and the sphere when a load is applied. When the load is applied and further movement is caused in the lateral direction, the sphere 4 can be absorbed by moving the position slightly and changing the contact point. At this time, since the upper leg portion 2 and the lower leg portion 7 are through-coupled by the three position holding members 9a, 9b, 9c, the movement of the entire leg structure in the lateral direction is the above-described position holding member. And the size of the gap between the two through holes.

  As a first modification of the leg structure 1 according to the first embodiment, the configuration of the leg structure 1 may be arranged upside down with respect to the configuration of FIG. FIG. 3 shows a cross-sectional view at the same position as the cross-sectional view shown in FIG. 2 in the first modification of the leg structure 1. In the first modification, the leg structure 1 has a cylindrical lower leg portion 7 having a female screw hole 3a, a sphere 4, and a through hole 5a slightly larger than the diameter of the sphere 4 at the center, and the female screw The gap adjusting member 5 having a through hole 6a having a diameter larger than the hole 3a and having the same central axis, a substantially dome-shaped concave portion 2a at the center of the bottom surface, and having the same central axis as the through hole 6a A cylindrical upper leg portion 2 having two-stage through holes 8a having different diameters, a position holding member 9a for holding the relative positions of the upper leg portion and the lower leg portion, and a bottom surface that contacts the installation surface and absorbs an impact. The structure has a portion 10.

  In the configuration shown in FIG. 3, the leg structure 1 is configured such that the position holding member 9 a meshed with the lower leg portion passes through the distance adjusting member 5 and the upper leg portion 2, and the bottom portion of the position holding member 9 a is separated from the upper leg portion 2. By abutting so as to be suspended, the positions of the upper leg 2, the cushioning material 5, and the lower leg 7 in the vertical direction are maintained. Further, the position holding member 9a is arranged so as not to contact with the predetermined gap between the through hole 6a and the two-stage through hole 8a of the interval adjusting member 5.

  The leg structure 1 according to the first modification shown in FIG. 3 performs the same operation as the operation shown in FIG. That is, when a load is applied to at least one of the upper surface and the lower surface of the leg structure 1, the lower leg portion 7 is pushed upward, and the position holding member 9a is also raised accordingly. At this time, the position holding member 9a is coupled to the lower leg portion 7 via a screw. However, since the gap adjusting member 5 and the upper leg portion 2 are not coupled as described above, the position holding member 9a is It moves away from contact with the leg 2 and moves upward. Further, since the distance adjusting member 5 is made of an elastic material, the thickness of the distance adjusting member 5 is reduced by the amount that the position holding member 9a is moved upward, and is deformed into a convex shape in the lateral direction. Accordingly, the sphere 4 that is movable in the space formed by the upper leg portion 2, the concave portion 7a, and the through hole 5a has a smaller distance between the upper leg portion 2 and the lower leg portion 7. And point contact with the lower leg 7 respectively. Thereby, the space | interval adjustment member 5 does not become thin any more, but the height of the leg part structure 1 whole is fixed. Therefore, similarly to the example shown in FIG. 2, if the configuration of the present modification is used, the area for transmitting vibration is remarkably reduced. Therefore, the vibration frequency to be transmitted is set to the upper leg 2, the lower leg 7, and the sphere. Only the natural vibration frequency of the material of 4 can be set.

  By using the leg structure 1 configured as described above, the upper leg and the lower leg are brought into two-point contact via a sphere, so that the natural vibration frequency transmitted through both legs is limited, and other vibration sources It is possible to suppress the transmission of vibration from the. In addition, the electronic device using the leg structure having such a configuration can limit vibrations of various frequencies generated by itself to a very narrow range of natural vibration frequencies. It is also possible to suppress the influence of.

  By adopting the structure and operation as described above, it is easy to select and process the material, and the leg portion that can limit the natural vibration frequency to be transmitted using the structure having the freedom in the height direction and the lateral direction. A structure can be realized.

  FIG. 4 shows a cross-sectional view at the same position as the cross-sectional view shown in FIG. 2 of the leg structure 1 according to the second modification of the present embodiment. According to the second modification, the leg structure 1 according to the first embodiment may have no gap adjusting member 5 as shown in FIG. By adopting such a configuration, it is possible to eliminate the transmission of vibration due to contact with the distance adjusting member 5, limit the vibration frequency to a complete two-point contact, and suppress lateral movement of the sphere 4. It becomes. Further, the leg structure 1 may be provided with the recess 2 a and the recess 7 a in both the upper leg 2 and the lower leg 7. Moreover, the leg part structure 1 can also provide the recessed part 2a in the upper leg part 2, and can make the lower leg part 7 into a flat structure.

  The preferred embodiments and modifications of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and is within the scope of the gist of the present invention described in the claims. Various modifications and changes are possible. For example, in the above-described embodiment, the position holding members 9a, 9b, and 9c are configured to be screw-engaged with the upper leg portion 7 or the lower leg portion 7, but are fixed by other methods such as fitting and adhesion. Also good. Moreover, although the space | interval adjustment member 5 becomes a structure which has an integral cylindrical shape, when the load is not applied to the leg structure 1, the space | interval of the upper leg part 2 and the lower leg part 7 is made into the predetermined range. As long as it can be held, the spacer may be made of a plurality of elastic bodies.

It is a disassembled perspective view which shows the structure of the leg structure 1 by Example 1 of this invention. It is sectional drawing cut | disconnected by the cross section which passes along the center of the leg structure 1 by Example 1 of this invention, Fig.2 (a) shows the state by which the load is not applied to the leg structure 1, FIG. b) shows a state in which a load is applied to the leg structure 1. It is sectional drawing similar to what was shown by FIG. 2 which shows the 1st modification of the leg structure 1 by Example 1 of this invention. It is sectional drawing similar to what was shown by FIG. 2 which shows the 2nd modification of the leg structure 1 by Example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Leg part structure 2 Upper leg part 4 Sphere 5 Space | interval adjustment member 7 Lower leg part 9a, 9b, 9c Position holding member 10 Bottom face part

Claims (7)

A first leg, a second leg, a plurality of position holding members that hold a relative position of the first leg and the second leg within a predetermined range; and the first leg. And a sphere sandwiched between the second leg and a leg structure,
A substantially dome-shaped recess is provided on at least one of the surfaces of the first leg and the second leg that sandwich the sphere,
A leg structure according to claim 1, wherein when a load is applied, the sphere is located within the range of the recess and is in point contact with each of the first leg and the second leg. The plurality of position holding members are fixed to one of the first leg and the second leg, and when no load is applied to the leg structure, the first leg And abutment with one of the second legs that is not fixed, thereby maintaining the positional relationship between the first leg and the second leg, and a load is applied to the leg structure. 2. The leg structure according to claim 1, wherein one of the first leg and the second leg that is not fixed is not in contact with the leg structure. The plurality of position holding members are rod-shaped, and are fixed to one of the first leg portion and the second leg portion and located inside an opening provided in the other, whereby the first leg The leg structure according to claim 1 or 2, wherein a range of relative movement between the part and the second leg part is restricted. The plurality of position holding members include a fixed portion fixed to one of the first leg portion and the second leg portion, an intermediate portion, and a bottom surface portion having a cross-sectional area larger than a cross-sectional area of the intermediate portion. And continuously
The other one of the first leg and the second leg not fixed to the plurality of position holding members corresponds to the shape of the intermediate part and the bottom part, and the intermediate part and the bottom part. A plurality of two-stage through holes having a shape slightly larger than the respective shapes of
The plurality of position holding members are inserted into the two-stage through holes, and the bottom surface portion abuts against the step parts of the two-stage through holes, so that the first leg and the second leg are relatively moved. 4. The leg structure according to claim 3, wherein a range to be controlled is regulated. An elastic body interval adjusting member that sets the interval between the first leg portion and the second leg portion within a predetermined range is sandwiched between the first leg portion and the second leg portion. ,
The gap adjusting member has a plurality of openings at positions where the spherical body and the plurality of position holding members are arranged.
When the load is not applied to the leg structure, the distance adjusting member maintains the positional relationship between the first leg and the second leg, and the load is applied to the leg structure. 5. The sphere according to claim 1, wherein the sphere is deformed so as to make point contact with each of the first leg and the second leg. 6. Leg structure. The leg according to any one of claims 1 to 5, further comprising a bottom surface member attached to one of the first leg and the second leg and in contact with an installation plane. Partial structure. An electronic device comprising a plurality of the leg structures according to claim 1 on the same bottom surface portion.

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