JPWO2015140993A1 - Telescopic device - Google Patents

Abstract

A telescopic device having good operability is provided. The leg (12), which is an expansion / contraction device, includes an upper tubular body (21), a lower tubular body (22), and a fixing for releasably fixing the lower tubular body (22) to the upper tubular body (21). Means (31). The fixing means (31) has an operation body (61) that can be rotated. The lower tubular body (22) is fixed to and released from the upper tubular body (21) by rotating the operating body (61) at a predetermined angle.

Description

  The present invention relates to a telescopic device capable of stretching.

  2. Description of the Related Art Conventionally, for example, a support device (such as a tripod or a monopod) that supports a camera is widely known (for example, Patent Document 1).

  This type of support device includes a leg that is a telescopic device that can be expanded and contracted, and this leg has a configuration as shown in FIG. 9, for example.

  The leg 1 shown in FIG. 9 includes an upper tubular body 2, a lower tubular body 3 movably inserted into the upper tubular body 2, and the lower tubular body 3 with respect to the upper tubular body 2. And fixing means 4 for releasably fixing.

  The fixing means 4 has an operation nut 6 screwed to the outer peripheral side of the lower end portion of the upper tubular body 2, and a fixing ring 7 disposed between the operation nut 6 and the lower tubular body 3. doing.

  When the operation nut 6 is rotated in the fixing direction, the fixing ring 7 is pressed against the outer peripheral surface of the lower tubular body 3, whereby the lower tubular body 3 is fixed to the upper tubular body 2. Further, when the operation nut 6 is rotated in the fixing release direction, the fixing of the fixing ring 7 is released, whereby the fixing of the lower tubular body 3 to the upper tubular body 2 is released.

JP 2004-258451 A

  However, in the above-described conventional configuration, when the operation nut 6 is rotated, for example, by 120 degrees in order to release the fixing to the upper tubular body 2 of the lower tubular body 3, in order to fix the operation nut 6 again, the reverse direction of 120 degrees However, if, for example, 5 rotations are required for release, the rotation must be performed 5 times to fix again, and the operability is poor.

  This invention is made | formed in view of such a point, and it aims at providing the expansion / contraction apparatus with favorable operativity.

  The telescopic device according to claim 1, an upper tubular body, a lower tubular body movably inserted into the upper tubular body, and a fixing means for releasably fixing the lower tubular body to the upper tubular body. The fixing means includes an operating body that can be rotated, and the lower tubular body is fixed to and released from the upper tubular body by a rotating operation of the operating body at a predetermined angle. is there.

  The telescopic device according to claim 2 is the telescopic device according to claim 1, wherein the lower tubular body is fixed to and released from the upper tubular body by rotating the operating body at a predetermined angle of 360 degrees or less. is there.

  The telescopic device according to claim 3 is the telescopic device according to claim 1 or 2, wherein the upper tubular body has a contact receiving surface, and the operating body has a contact surface that contacts the contact receiving surface, When releasing the fixation of the lower tubular body with respect to the upper tubular body, the rotation operation of the operation body in the fixing release direction is restricted by the contact between the contact surface and the contact receiving surface.

  The telescopic device according to claim 4 is the telescopic device according to any one of claims 1 to 3, wherein the upper tubular body has a convex portion having a contact receiving surface on an outer peripheral side, and the operating body is the convex portion. Has a concave portion having a contact surface inserted on the inner peripheral side, and when the lower tubular body is released from being fixed to the upper tubular body, the contact surface of the concave portion contacts the contact receiving surface of the convex portion, By this contact, the turning operation of the operation body in the fixing release direction is restricted.

  According to a fifth aspect of the present invention, in the telescopic device according to the fourth aspect, the upper tubular body has a convex portion having a contact receiving surface formed on the outer peripheral surface and is screwed with an inner peripheral screw portion of the operating body. An outer peripheral thread portion is formed on the outer peripheral surface, and an inward protruding portion is formed on the inner peripheral surface. The cylindrical member has an inner peripheral surface after the convex portion is formed by pressing. The inner projecting portion is formed by cutting and the outer peripheral thread portion is formed by cutting on the outer peripheral surface.

  According to the present invention, since the operation body is fixed to and released from the upper tubular body by rotating the operation body at a predetermined angle, the operability is good.

It is a disassembled perspective view of the expansion-contraction apparatus (leg body) which concerns on one embodiment of this invention. It is a disassembled perspective view of the fixing body of the fixing means of an expansion / contraction apparatus same as the above. It is sectional drawing at the time of fixation cancellation | release by the fixing means of the expansion / contraction apparatus same as the above (at the time of unlocking). It is AA sectional drawing in FIG. It is sectional drawing at the time of fixation (at the time of a lock | rock) by the fixing means of an expansion-contraction apparatus same as the above. It is BB sectional drawing in FIG. It is a perspective view of the monopod which comprised the same expansion-contraction apparatus same as the above, (a) is a figure of the state contracted, (b) is a figure of the state which extended. (A) thru | or (c) is explanatory drawing for demonstrating the manufacturing method of a cylindrical member. It is sectional drawing of the conventional expansion-contraction apparatus.

  One embodiment of the telescopic device of the present invention will be described with reference to FIGS.

  In FIG. 7, 11 is a monopod as a support device for supporting a supported object (not shown). The supported object is an optical device such as a camera.

  The monopod 11 is attached to an upper end portion of the leg body 12 and a leg body 12 that is a single telescopic device that has a longitudinal direction in the vertical direction and can be expanded and contracted along the longitudinal direction. And a support 13 for supporting the.

  The support 13 includes a disk-shaped support plate 14 that supports a supported object (not shown) such as a camera, and a mounting screw 15 is provided at the center of the support plate 14.

  The leg body 12 is inserted into at least the upper tubular body 21 so as to be movable in the vertical direction (axial direction) into the upper tubular body 21, and protrudes from the lower end of the upper tubular body 21 by movement with respect to the upper tubular body 21. A lower tubular body 22 whose length is adjustable, and a fixing means 31 for releasably fixing the lower tubular body 22 to the upper tubular body 21 are provided.

  That is, for example, in the example shown in FIG. 7, the leg body 12 has a plurality of stages, for example, a six-stage type, and a plurality of, for example, six cylinders (including a substantially cylindrical shape) each having a slightly different diameter size. (Same) first to sixth tubular bodies 21 to 26 and a plurality of, for example, five first to fifth fixing means 31 to 35 provided on the lower ends of the tubular bodies 21 to 25.

  A support 13 is attached to the upper end of the uppermost tubular body 21, and a stone bump 30 is attached to the lower end of the lowermost tubular body 26. A cylindrical foamed rubber grip 29 is fitted on the outer peripheral side of the uppermost tubular body 21.

  Here, as shown in FIGS. 1, 3 to 6, the upper tubular body 21 has an upper portion fitted and fixed to the outer peripheral side of the cylindrical upper tubular member 41 and the lower end portion of the upper tubular member 41. And a cylindrical member (cylindrical portion) 42 having a cylindrical shape. For example, the upper tubular member 41 and the tubular member 42 may be integrally formed.

  On the inner peripheral surface of the upper tubular member 41, two vertically extending protrusions 43 that are spaced apart from each other and are opposed to each other are formed.

  A convex portion 45 that is a substantially elliptical contact receiving portion having a longitudinal direction in the vertical direction is formed at one location on the upper outer peripheral surface of the cylindrical member 42. The convex portion 45 is formed on the upper outer peripheral side of the cylindrical member 42 from the vicinity of the upper end portion of the cylindrical member 42 to the vicinity of the central portion in the vertical direction of the cylindrical member 42. The convex portion 45 has an abutting receiving surface 46 that is vertically long on one surface (front surface in the fixing direction a) along the vertical direction (see FIG. 6). Note that the surface of the convex portion 45 opposite to the contact receiving surface 46, that is, the other surface along the vertical direction (front surface in the fixing release direction b) is the facing surface 50.

  An outer peripheral thread portion 47 formed of a spiral groove is formed on the lower outer peripheral surface of the cylindrical member 42. A circular annular inward projecting portion 48 along the circumferential direction of the cylindrical member 42 is formed on the inner peripheral surface of the cylindrical member 42 in the center in the vertical direction.

  As shown in FIGS. 1, 3 to 6, the lower tubular member 22 includes a cylindrical lower tubular member 51 having a smaller diameter than the upper tubular member 41, and the outer periphery of the upper end portion of the lower tubular member 51. It has a cylindrical retaining member (preventing part) 52 that is fitted and fixed to the side and prevents the lower tubular body 22 from coming out of the upper tubular body 21. For example, the lower tubular member 51 and the retaining member 52 may be configured integrally.

  On the inner peripheral surface of the lower tubular member 51, two vertically extending projections 53 for preventing rotation are formed so as to be spaced apart from each other. A cylindrical member (not shown) similar to the cylindrical member 42 is fixed to the outer peripheral side of the lower end portion of the lower tubular member 51.

  The retaining member 52 includes a plurality of, for example, two curved plate-shaped divided members 54 that are divided in the circumferential direction by the retaining member 52. Each divided member 54 has a circular insertion convex portion 55 on the inner surface side, and this insertion convex portion 55 is inserted into the hole 56 at the upper end portion of the lower tubular member 51. Note that the protruding portion 43 of the upper tubular member 41 is inserted between the opposed end portions of the two split members 54.

  As shown in FIGS. 1 to 6, the fixing means 31 is screwed to the outer peripheral side of the lower end portion of the upper tubular body 21, that is, the outer peripheral threaded portion 47 of the cylindrical member 42, and is fixed to the cylindrical member 42. A cylindrical operation body 61 that can be rotated about a vertical rotation center axis, an inner peripheral surface of the lower end portion of the upper tubular body 21 (an inner peripheral surface of the cylindrical member 42), and an outer peripheral surface of the lower tubular body 22 And a cylindrical fixing body 62 that releasably fixes the lower tubular body 22 to the upper tubular body 21 based on a turning operation of the operating body 61. The fixed body 62 is sandwiched between the inward projecting portion 48 of the cylindrical member 42 and the inward projecting annular plate portion 69 of the operating body 61.

  The operating body 61 includes, for example, a screw member 64 that is a cylindrical lock nut screwed to the outer peripheral thread portion 47 of the cylindrical member 42 of the upper tubular body 21, and a spline fitting on the outer peripheral side of the screw member 64. The cylindrical operation member 65 is attached to the outer peripheral side of the operation member 65, and a rubber cylindrical cover member 66 that covers the operation member 65 and the screwing member 64 is provided.

  As shown in FIG. 3 and the like, the screw member 64 has a cylindrical tubular portion 68, and a circular annular plate portion 69 is directed inward from the inner peripheral surface of the lower end portion of the tubular portion 68. Protrusively. The fixed body 62 is sandwiched between the inward projecting portion 48 of the cylindrical member 42 and the inward projecting annular plate portion 69 of the operating body 61.

  Further, an inner peripheral screw portion 70 that is screwed with the outer peripheral screw portion 47 of the cylindrical member 42 is formed on the inner peripheral surface of the cylindrical portion 68. A plurality of outer peripheral grooves 71 along the axial direction are formed on the outer peripheral surface of the cylindrical portion 68 (see FIG. 1). A plurality of inner peripheral grooves 72 corresponding to the outer peripheral grooves 71 of the screwing member 64 are formed in the lower inner peripheral surface of the operation member 65 along the axial direction.

  In addition, a recessed portion 75 is formed in a predetermined portion of the upper inner peripheral surface of the operation member 65 so as to be cut out from the upper end surface. That is, the concave portion 75 is formed on the upper inner peripheral side of the operation member 65 from the upper end surface of the operation member 65 to the central portion in the vertical direction of the operation member 65. A convex portion 45 on the outer peripheral side of the cylindrical member 42 is inserted into and stored in the concave portion 75 so as to be movable in the circumferential direction of the operation member 65 with respect to the concave portion 75.

  4 and 6 and the like, one of the concave portions 75 of the operating member 65, which has a longitudinally long surface positioned along the radial direction of the operating member 65, is in contact with the convex portion 45. A contact surface 76 that contacts the surface 46 is formed. In addition, the other longitudinally long surface located along the radial direction of the operation member 65 among the recesses 75 of the operation member 65 is a facing surface 77 that faces the facing surface 50 of the convex portion 45 so as to be spaced apart. . Further, an arcuate surface located along the circumferential direction of the operating member 65 in the recess 75 of the operating member 65 is an arcuate surface 78 facing the outer peripheral surface of the cylindrical member 42.

  Note that the contact surface 76 of the concave portion 75 contacts the contact receiving surface 46 of the convex portion 45 when the operating body 61 rotates in the fixing release direction b. At this time, the facing surface 77 of the concave portion 75 does not contact the facing surface 50 of the convex portion 45.

  Further, as shown in FIG. 3 and the like, the cover member 66 has a cylindrical tubular portion 81 that covers the entire outer peripheral surface of the operation member 65. A circular annular upper annular plate portion 82 projects integrally inward from the inner peripheral surface of the upper end portion of the cylindrical portion 81, and the inner peripheral surface of the upper annular plate portion 82 contacts the outer peripheral surface of the upper end portion of the cylindrical member 42. doing. Further, a circular annular lower annular plate portion 83 protrudes inward from the inner peripheral surface of the lower end portion of the tubular portion 81, and the lower annular plate portion 83 covers the lower surface of the screw member 64.

  A first gap 84 exists between the inner peripheral surface of the lower annular plate portion 83 of the cover member 66 and the outer peripheral surface of the lower tubular body 22. Similarly, a second gap 85 that communicates with the first gap 84 exists between the inner peripheral surface of the annular plate portion 69 of the screw member 64 and the outer peripheral surface of the lower tubular body 22. Is closed by a pressed surface 98 described later.

  As shown in FIGS. 2 and 3, etc., the fixed body 62 has a plurality of frustoconical (for example, five) inner circumferential upward inclined surfaces 86 that gradually increase in diameter toward the upper inner circumference. A cylindrical outer member 88 having a plurality of (e.g., five) frusto-cone-shaped inner circumferential downward inclined surfaces 87 on the lower inner peripheral side, which are provided on the side and gradually increase in diameter downward. A cylindrical upper inner member 92 having a plurality of (for example, five) outer peripheral downward inclined surfaces 91 in contact with the upward inclined surface 86 in a planar shape, and an inner peripheral downward inclined surface 87 in a planar shape. And a cylindrical lower inner member 94 having a plurality of (for example, five) outer peripheral upward inclined surfaces 93 on the outer peripheral side.

  An outer member 88 is disposed in the outer peripheral portion of the space between the inner peripheral surface of the cylindrical member 42 and the outer peripheral surface of the lower tubular body 22, and the upper inner member 92 is disposed in the inner peripheral portion of the space. A lower inner member 94 is disposed. That is, the upper and lower inner members 92 and 94 are disposed on the inner peripheral side of one outer member 88 so as to contact the inner peripheral surface of the outer member 88. These upper and lower inner members 92 and 94 are arranged so as not to contact each other, and the lower end surface of the upper inner member 92 and the upper end surface of the lower inner member 94 are spaced apart from each other with a gap 90 therebetween.

  Then, when the operating body 61 is rotated in a fixed direction a which is one direction (for example, a rotating operation of a predetermined angle θ of 90 degrees or less), based on the radially inward force received from the outer member 88. The upper inner member 92 and the lower inner member 94 are elastically reduced in diameter and pressed onto the outer peripheral surface of the lower tubular body 22, whereby the lower tubular body 22 is fixed to the upper tubular body 21.

  Further, when the operation body 61 is rotated in a fixing release direction b which is the other direction opposite to one direction (for example, a rotation operation of a predetermined angle θ of 90 degrees or less), both inner sides are based on the elastic restoring force. The members 92 and 94 are restored to their original shapes, and the upper inner member 92 and the lower inner member 94 are released from the outer peripheral surface of the lower tubular body 22, thereby fixing the lower tubular body 22 to the upper tubular body 21. Canceled. By the release of the fixing, the lower tubular body 22 becomes movable in the axial direction with respect to the upper tubular body 21.

  In addition, the predetermined angle θ when the operating body 61 is rotated with respect to the cylindrical member 42 is 360 degrees or less, for example, 120 to 90 degrees or less, preferably an angle within a range of 40 degrees to 60 degrees, For example, it is 50 degrees. In FIG. 6, a point P is a point on the rotation center axis of the operating body 61, a line L1 passing through the contact surface 76 of the operating body 61 located at the fixed position and the point P, and the cylindrical member 42. The angle formed between the contact receiving surface 46 and the line L2 passing through the point P is a predetermined angle θ.

  Here, the outer member 88 is configured by a plurality of, for example, two divided members 95 divided in the circumferential direction of the outer member 88. The upper end surface of one split member 95 is formed in a step shape, and the lower end surface of the other split member 95 is formed in a step shape. In addition, a plurality of mutually parallel inner circumferential upward inclined surfaces 86 are formed on the upper inner peripheral surface of each divided member 95, and a plurality of parallel inner parallel upper and lower surfaces are formed on the lower inner peripheral surface of each divided member 95. An inner circumferential downward inclined surface 87 is formed. That is, the outer member 88 has saw-shaped peaks of different directions on the inner peripheral side. The outer member 88 and the lower inner member 94 are movable in the vertical direction by a slight amount with respect to the upper tubular body 21 based on the turning operation of the operating body 61.

  The upper inner member 92 has a C-shape with a notch 96 so that it can be easily reduced in diameter, and the outer peripheral surface of the upper inner member 92 corresponds to the inner peripheral upward inclined surface 86. Thus, a plurality of outer peripheral downward inclined surfaces 91 that are parallel to each other are formed vertically. That is, the upper inner member 92 has a saw-like peak on the outer peripheral side. The upper end surface of the upper inner member 92 is always in contact with the inward protruding portion 48 of the cylindrical member 42. Further, the contact between the upper end surface of the upper inner member 92 and the lower end surface of the retaining member 52 prevents the lower tubular body 22 from coming off from the upper tubular body 21.

  Further, the lower inner member 94 also has a C-shape having a notch 97 so as to be easily deformed in diameter as in the case of the upper inner member 92. The outer peripheral surface of the lower inner member 94 has an inner peripheral surface. Corresponding to the downward inclined surface 87, a plurality of parallel outer peripheral upward inclined surfaces 93 arranged in the vertical direction are formed. In other words, the lower inner member 94 has a saw-shaped mountain on the outer peripheral side that is different in direction from the saw-shaped mountain of the upper inner member 92.

  In addition, the lower inner member 94 has a horizontal pressed surface 98 along the direction orthogonal to the axial direction of the lower tubular body 22 at the lower end surface. Then, the pressed surface 98 is pressed upward by the pressing surface 99 of the screw member 64 based on the turning operation of the operating body 61 in the fixing direction. The pressing surface 99 is formed in a planar shape on the upper surface of the annular plate portion 69 of the screw member 64, that is, on the inner peripheral portion of the upper surface of the annular plate portion 69 along the direction orthogonal to the axial direction of the screw member 64, It is always in contact with the pressed surface 98.

  Although the first and second tubular bodies 21 and 22 and the first fixing means 31 have been described, the other tubular bodies 23 to 26 and the fixing means 32 to 35 have the same configuration.

  Here, FIG. 8 is a diagram for explaining a method of manufacturing the cylindrical member 42, and a method of manufacturing the cylindrical member 42 will be described with reference to this drawing.

  The cylindrical member 101 shown in FIG. 8A is made of a metal such as aluminum, and both the inner peripheral surface and the outer peripheral surface are formed in a cylindrical surface shape.

  First, as shown in FIG. 8B, a substantially elliptical convex portion 45 is formed on the outer peripheral surface of the cylindrical member 101 so as to protrude outward by pressing with a press. At the time of this pressing, a substantially elliptical concave portion 102 is formed on the inner peripheral surface of the cylindrical member 101.

  Thereafter, as shown in FIG. 8C, an outer peripheral threaded portion 47 is formed on the outer peripheral surface of the cylindrical member 101 by cutting with a lathe, and a circular annular inward protruding portion 48 is formed on the inner peripheral surface of the cylindrical member 101. Form.

  In this way, the cylindrical member 42 having the convex portion 45, the outer peripheral threaded portion 47, and the inward protruding portion 48 is completed. When attaching the completed tubular member 42 to the upper tubular member 41, the lower end portion of the upper tubular member 41 is tubular until the lower end surface of the upper tubular member 41 contacts the inwardly projecting portion 48 of the tubular member 42. It is inserted into the shaped member 42.

  For example, in a method in which the carbon tripod and the threaded portion are formed separately from the pipe and integrated by joining, the threaded tube is very thick. Therefore, the embossing (convex part) formed in the raw tube does not peel off even when the overlapping part is sufficiently removed.

  The tubular member 42, the tubular members 41 and 51, the retaining member 52, the screwing member 64, and the operation member 65 are made of metal such as aluminum (may be made of carbon), for example, and are outer members that constitute the fixed body 62. 88, the upper inner member 92 and the lower inner member 94 are made of a synthetic resin such as POM, for example.

  Next, the operation and the like of the one embodiment will be described.

  For example, when adjusting the length of the leg 12 of the monopod 11 to a desired length and then fixing the lower tubular body 22 to the upper tubular body 21 with the fixing means 31, the user of the monopod 11 can operate The body 61 is rotated by a predetermined angle θ of 90 degrees or less toward the fixed direction a. That is, the operating body 61 is rotated by a predetermined angle θ in the tightening direction with respect to the cylindrical member 42.

  Then, as shown in FIGS. 5 and 6, the upper inner member 92 and the lower inner member 94 of the fixed body 62 are crimped to the outer peripheral surface of the lower tubular body 22, and the lower tubular body 22 is bonded to the upper tubular body 21 by this crimping. It is fixed against.

  That is, when the operating body 61 is slightly moved upward according to the rotation in the fixing direction a, the pressed surface 98 of the lower inner member 94 is pressed upward by the pressing surface 99 of the operating body 61.

  As a result, the upper inner member 92 and the lower inner member 94 are elastically reduced in diameter based on the radially inward force received from the inclined surfaces 86, 87 of the outer member 88, and both the inner members 92, 94 The inner peripheral surface is pressed against the outer peripheral surface of the lower tubular body 22 and fixed by pressure. At this time, the lower inner member 94 and the outer member 88 move upward by a slight amount with respect to the cylindrical member 42. Since the upper inner member 92 is in contact with the inward projecting portion 48, it does not move upward.

  Thus, the lower tubular body (lower pipe) 22 is fixed to the upper tubular body (upper pipe) 21 by the fixing means 31. When the fixing means 31 is fixed, the lower tubular body 22 is firmly fixed to the upper tubular body 21 with sufficient fixing forces by the upper and lower inner members 92 and 94, and thus rattles. There is no such thing as shaking the head with respect to the upper tubular body 21. That is, for example, as shown in FIG. 7B, even when the leg 12 of the monopod 11 is extended to the maximum length and fixed by the fixing means 31 to 35, the two adjacent tubular bodies 21 to 26 are adjacent to each other. The connecting portion (joint portion) is not bent, and the leg body 12 is kept straight.

  Further, for example, even when the inner peripheral thread portion 70 is rattled with respect to the outer peripheral thread portion 47, the pressing surface 99 of the operating body 61 slides against the pressed surface 98 of the lower inner member 94. A sufficient fixing force by the inner members 92 and 94 is maintained.

  Next, for example, when releasing the fixation by the fixing means 31, the user of the monopod 11 rotates the operation body 61 by a predetermined angle θ of 90 degrees or less in the fixation release direction b. That is, the operating body 61 is rotated by a predetermined angle θ in the loosening direction with respect to the cylindrical member 42.

  Then, as shown in FIGS. 3 and 4, the pressure bonding of the upper inner member 92 and the lower inner member 94 with respect to the outer peripheral surface of the lower tubular body 22 is released, and the fixing to the upper tubular body 21 of the lower tubular body 22 is performed by releasing the pressure bonding. Is released.

  That is, when the operating body 61 is slightly moved downward in accordance with the rotation in the fixing release direction b, the pressing of the pressed surface 98 by the pressing surface 99 of the operating body 61 is released.

  As a result, the upper inner member 92 and the lower inner member 94 return to their original shapes based on the elastic restoring force, and the inner peripheral surfaces of the inner members 92 and 94 are slightly separated from the outer peripheral surface of the lower tubular body 22. In this state, the crimping of the inner members 92 and 94 to the outer peripheral surface is released. At this time, the lower inner member 94 and the outer member 88 move downward by a slight amount with respect to the cylindrical member 42.

  Further, when the operating body 61 is rotated in the fixing release direction b to release the fixing to the upper tubular body 21 of the lower tubular body 22, the contact surface 76 of the concave portion 75 of the operating body 61 has the upper tubular body 21. The abutment surface 46 abuts on the abutment receiving surface 46 of the convex portion 45, and the abutment operation restricts the operation body 61 in the fixing release direction b.

  That is, since the contact surface 76 of the concave portion 75 contacts the contact receiving surface 46 of the convex portion 45, the user does not turn the operation body 61 more than necessary in the fixing release direction b. Is rotated in the fixed release direction b by a predetermined angle θ about the rotation center axis in the vertical direction.

  Thus, the fixing of the lower tubular body 22 to the upper tubular body 21 by the fixing means 31 is released. When the fixing means 31 releases the fixation, the length of the leg 12 of the monopod 11 can be adjusted by moving the lower tubular body 22 relative to the upper tubular body 21.

  According to the above-described embodiment, rattling of the tubular bodies 22 to 26 at the time of fixing by the fixing body 62 of the fixing means 31 to 35 can be prevented. Can be taken.

  The fixed body 62 includes an outer member 88, an upper inner member 92, and a lower inner member 94. The outer member 88 has a plurality of inner peripheral upward inclined surfaces 86 and a plurality of inner peripheral downward inclined surfaces 87. Since the upper inner member 92 has a plurality of outer peripheral downward inclined surfaces 91 and the lower inner member 94 has a plurality of outer peripheral upward inclined surfaces 93, the tubular bodies 22 to 26 at the time of fixing by the fixing means 31 to 35 are provided. The rattle can be prevented appropriately.

  Further, the lower inner member 94 has a pressed surface 98 along the direction orthogonal to the axial direction of the lower tubular body 22 at the lower end surface, and the operating body 61 is a pressing surface that presses the pressed surface 98 of the lower inner member 94. 99, it is not affected by the backlash of the inner peripheral thread portion 70 of the operating body 61 with respect to the outer peripheral thread portion 47 of the upper tubular body 21, and the backlash of the tubular bodies 22 to 26 at the time of fixing by the fixing means 31 to 35 is prevented. This can be prevented more appropriately.

  In addition, the operation body 61 is always fixed to and released from the upper tubular body 21 by rotating the operation body 61 at a predetermined angle θ of 360 degrees (preferably 120 degrees, more preferably 90 degrees) or less. The operability is good.

  Further, when the operation body 61 is rotated to release the fixing of the lower tubular body 22 from the upper tubular body 21, the contact of the contact surface 76 and the contact receiving surface 46 causes the operation body 61 to be released from the unlocking direction. Therefore, it is possible to appropriately prevent the operating body 61 from being turned too far in the fixing release direction.

  In the above embodiment, the case where the telescopic device is the leg 12 of the monopod 11 has been described. However, for example, a tripod leg or a leg other than the leg of the support device may be used.

  Further, the telescopic device is not limited to the configuration including the six tubular bodies 21 to 26 and the five fixing means 31 to 35, and is configured to include at least two tubular bodies 21, 22 and one fixing means 31. I just need it.

  Further, the number of the inner peripheral upward inclined surface 86, the inner peripheral downward inclined surface 87, the outer peripheral downward inclined surface 91, and the outer peripheral upward inclined surface 93 of the fixed body 62 is arbitrary and may be plural. One may be sufficient.

  Further, for example, when the lower tubular body 22 is fixed to the upper tubular body 21 by rotating the operation body 61, the opposed surface 50 of the convex portion 45 of the cylindrical member 42 and the opposed surface of the concave portion 75 of the operating body 61 The configuration may be such that the rotation operation of the operation body 61 in the fixing direction a is restricted by the contact with 77.

  The present invention is used for, for example, an extendable leg body included in a support device.

12 Legs that are telescopic devices
21 Upper tubular body
22 Lower tubular body
31 Fixing means
42 Tubular member
45 Convex
46 Contact surface
47 External thread
48 Inward protrusion
61 Operation body
70 Inner thread
75 recess
76 Contact surface b Unlocking direction

The telescopic device according to claim 1, an upper tubular body, a lower tubular body movably inserted into the upper tubular body, and a fixing means for releasably fixing the lower tubular body to the upper tubular body. The fixing means has an operating body that can be rotated, and the lower tubular body can be fixed to and released from the upper tubular body by rotating the operating body at a predetermined angle of 360 degrees or less. Is to be done.

The telescopic device according to claim 2 is the telescopic device according to claim 1, wherein the lower tubular body is fixed to and released from the upper tubular body by rotating the operating body at a predetermined angle of 90 degrees or less. is there.

According to a third aspect of the present invention, in the telescopic device according to the first or second aspect, the upper tubular body has a contact receiving surface and an opposing surface , and the operating body has a contact surface that contacts the contact receiving surface. as well as organic have opposing surfaces spaced apart opposing to the opposing surface, when releasing the fixing against the upper tubular body of the lower tubular body, fixing of the contact by the operation of said abutment surface and said contact receiving surface Although the turning operation in the release direction is restricted, the opposing surfaces do not come into contact with each other when the lower tubular body is fixed to the upper tubular body .

12 Legs that are telescopic devices
21 Upper tubular body
22 Lower tubular body
31 Fixing means
42 Tubular member
45 Convex
46 Contact surface
47 External thread
48 Inward protrusion
50 facing surface
61 Operation body
70 Inner thread
75 recess
76 Contact surface
77 Opposing surface b Unlocking direction

  The present invention relates to a telescopic device capable of stretching.

  2. Description of the Related Art Conventionally, for example, a support device (such as a tripod or a monopod) that supports a camera is widely known (for example, Patent Document 1).

  This type of support device includes a leg that is a telescopic device that can be expanded and contracted, and this leg has a configuration as shown in FIG. 9, for example.

  The leg 1 shown in FIG. 9 includes an upper tubular body 2, a lower tubular body 3 movably inserted into the upper tubular body 2, and the lower tubular body 3 with respect to the upper tubular body 2. And fixing means 4 for releasably fixing.

  The fixing means 4 has an operation nut 6 screwed to the outer peripheral side of the lower end portion of the upper tubular body 2, and a fixing ring 7 disposed between the operation nut 6 and the lower tubular body 3. doing.

  When the operation nut 6 is rotated in the fixing direction, the fixing ring 7 is pressed against the outer peripheral surface of the lower tubular body 3, whereby the lower tubular body 3 is fixed to the upper tubular body 2. Further, when the operation nut 6 is rotated in the fixing release direction, the fixing of the fixing ring 7 is released, whereby the fixing of the lower tubular body 3 to the upper tubular body 2 is released.

JP 2004-258451 A

  However, in the above-described conventional configuration, when the operation nut 6 is rotated, for example, by 120 degrees in order to release the fixing to the upper tubular body 2 of the lower tubular body 3, in order to fix the operation nut 6 again, the reverse direction of 120 degrees However, if, for example, 5 rotations are required for release, the rotation must be performed 5 times to fix again, and the operability is poor.

  This invention is made | formed in view of such a point, and it aims at providing the expansion / contraction apparatus with favorable operativity.

The telescopic device according to claim 1, an upper tubular body, a lower tubular body movably inserted into the upper tubular body, and a fixing means for releasably fixing the lower tubular body to the upper tubular body. The fixing means includes an operation body that can be rotated, and the lower tubular body is moved relative to the upper tubular body by a rotation operation of a predetermined angle within a range of 40 degrees to 60 degrees of the operation body. It is fixed and released.

The telescopic device according to claim 2 is the telescopic device according to claim 1, wherein the upper tubular body has an upper tubular member and a cylindrical member fixed to a lower end portion of the upper tubular member, and the operating body is A screw member that is screwed onto the outer peripheral threaded portion of the cylindrical member, and an operation member that is mounted on the outer peripheral side of the screw member, A convex portion having a surface and an opposing surface is formed, and the outer peripheral screw portion that is screwed with the inner peripheral screw portion of the screw member is formed on the lower outer peripheral surface of the cylindrical member, A concave portion having a contact surface that contacts the contact receiving surface and a facing surface that is spaced apart from the facing surface is formed on the peripheral surface, and the convex portion is formed on the operation member with respect to the concave portion. It is inserted so as to be movable in the circumferential direction. When the fixing to the upper tubular body is released, the contact surface of the concave portion comes into contact with the contact receiving surface of the convex portion, and by this contact, the operation body is rotated in the unlocking direction. It is regulated.

The telescopic device according to claim 3 is the telescopic device according to claim 2, wherein the concave portion of the operation member is formed on the upper inner peripheral side of the operation member from the upper end surface of the operation member to the center in the vertical direction of the operation member. It is what has been.

The telescopic device according to claim 4 is the telescopic device according to claim 2 or 3, wherein the fixing means fixes the lower tubular body to the upper tubular body so as to be releasable based on a turning operation of the operating body. The fixed body is disposed between the inner peripheral surface of the tubular member of the upper tubular body and the outer peripheral surface of the lower tubular body.

The telescopic device according to claim 5 is the telescopic device according to claim 4, wherein the fixed body is an inward projecting portion of the tubular member of the upper tubular body and an inward projecting annular plate portion of the screw member of the operating body. Is sandwiched between.

  According to the present invention, since the operation body is fixed to and released from the upper tubular body by rotating the operation body at a predetermined angle, the operability is good.

It is a disassembled perspective view of the expansion-contraction apparatus (leg body) which concerns on one embodiment of this invention. It is a disassembled perspective view of the fixing body of the fixing means of an expansion / contraction apparatus same as the above. It is sectional drawing at the time of fixation cancellation | release by the fixing means of the expansion / contraction apparatus same as the above (at the time of unlocking). It is AA sectional drawing in FIG. It is sectional drawing at the time of fixation (at the time of a lock | rock) by the fixing means of an expansion-contraction apparatus same as the above. It is BB sectional drawing in FIG. It is a perspective view of the monopod which comprised the same expansion-contraction apparatus same as the above, (a) is a figure of the state contracted, (b) is a figure of the state which extended. (A) thru | or (c) is explanatory drawing for demonstrating the manufacturing method of a cylindrical member. It is sectional drawing of the conventional expansion-contraction apparatus.

  One embodiment of the telescopic device of the present invention will be described with reference to FIGS.

  In FIG. 7, 11 is a monopod as a support device for supporting a supported object (not shown). The supported object is an optical device such as a camera.

  The monopod 11 is attached to an upper end portion of the leg body 12 and a leg body 12 that is a single telescopic device that has a longitudinal direction in the vertical direction and can be expanded and contracted along the longitudinal direction. And a support 13 for supporting the.

  The support 13 includes a disk-shaped support plate 14 that supports a supported object (not shown) such as a camera, and a mounting screw 15 is provided at the center of the support plate 14.

  The leg body 12 is inserted into at least the upper tubular body 21 so as to be movable in the vertical direction (axial direction) into the upper tubular body 21, and protrudes from the lower end of the upper tubular body 21 by movement with respect to the upper tubular body 21. A lower tubular body 22 whose length is adjustable, and a fixing means 31 for releasably fixing the lower tubular body 22 to the upper tubular body 21 are provided.

  That is, for example, in the example shown in FIG. 7, the leg body 12 has a plurality of stages, for example, a six-stage type, and a plurality of, for example, six cylinders (including a substantially cylindrical shape) each having a slightly different diameter size. (Same) first to sixth tubular bodies 21 to 26 and a plurality of, for example, five first to fifth fixing means 31 to 35 provided on the lower ends of the tubular bodies 21 to 25.

  A support 13 is attached to the upper end of the uppermost tubular body 21, and a stone bump 30 is attached to the lower end of the lowermost tubular body 26. A cylindrical foamed rubber grip 29 is fitted on the outer peripheral side of the uppermost tubular body 21.

  Here, as shown in FIGS. 1, 3 to 6, the upper tubular body 21 has an upper portion fitted and fixed to the outer peripheral side of the cylindrical upper tubular member 41 and the lower end portion of the upper tubular member 41. And a cylindrical member (cylindrical portion) 42 having a cylindrical shape. For example, the upper tubular member 41 and the tubular member 42 may be integrally formed.

  On the inner peripheral surface of the upper tubular member 41, two vertically extending protrusions 43 that are spaced apart from each other and are opposed to each other are formed.

  A convex portion 45 that is a substantially elliptical contact receiving portion having a longitudinal direction in the vertical direction is formed at one location on the upper outer peripheral surface of the cylindrical member 42. The convex portion 45 is formed on the upper outer peripheral side of the cylindrical member 42 from the vicinity of the upper end portion of the cylindrical member 42 to the vicinity of the central portion in the vertical direction of the cylindrical member 42. The convex portion 45 has an abutting receiving surface 46 that is vertically long on one surface (front surface in the fixing direction a) along the vertical direction (see FIG. 6). Note that the surface of the convex portion 45 opposite to the contact receiving surface 46, that is, the other surface along the vertical direction (front surface in the fixing release direction b) is the facing surface 50.

  An outer peripheral thread portion 47 formed of a spiral groove is formed on the lower outer peripheral surface of the cylindrical member 42. A circular annular inward projecting portion 48 along the circumferential direction of the cylindrical member 42 is formed on the inner peripheral surface of the cylindrical member 42 in the center in the vertical direction.

  As shown in FIGS. 1, 3 to 6, the lower tubular member 22 includes a cylindrical lower tubular member 51 having a smaller diameter than the upper tubular member 41, and an outer periphery of the upper end portion of the lower tubular member 51. It has a cylindrical retaining member (preventing part) 52 that is fitted and fixed to the side and prevents the lower tubular body 22 from coming out of the upper tubular body 21. For example, the lower tubular member 51 and the retaining member 52 may be configured integrally.

  On the inner peripheral surface of the lower tubular member 51, two vertically extending projections 53 for preventing rotation are formed so as to be spaced apart from each other. A cylindrical member (not shown) similar to the cylindrical member 42 is fixed to the outer peripheral side of the lower end portion of the lower tubular member 51.

  The retaining member 52 includes a plurality of, for example, two curved plate-shaped divided members 54 that are divided in the circumferential direction by the retaining member 52. Each divided member 54 has a circular insertion convex portion 55 on the inner surface side, and this insertion convex portion 55 is inserted into the hole 56 at the upper end portion of the lower tubular member 51. Note that the protruding portion 43 of the upper tubular member 41 is inserted between the opposed end portions of the two split members 54.

  As shown in FIGS. 1 to 6, the fixing means 31 is screwed to the outer peripheral side of the lower end portion of the upper tubular body 21, that is, the outer peripheral threaded portion 47 of the cylindrical member 42, and is fixed to the cylindrical member 42. A cylindrical operation body 61 that can be rotated about a vertical rotation center axis, an inner peripheral surface of the lower end portion of the upper tubular body 21 (an inner peripheral surface of the cylindrical member 42), and an outer peripheral surface of the lower tubular body 22 And a cylindrical fixing body 62 that releasably fixes the lower tubular body 22 to the upper tubular body 21 based on a turning operation of the operating body 61. The fixed body 62 is sandwiched between the inward projecting portion 48 of the cylindrical member 42 and the inward projecting annular plate portion 69 of the operating body 61.

  The operating body 61 includes, for example, a screw member 64 that is a cylindrical lock nut screwed to the outer peripheral thread portion 47 of the cylindrical member 42 of the upper tubular body 21, and a spline fitting on the outer peripheral side of the screw member 64. The cylindrical operation member 65 is attached to the outer peripheral side of the operation member 65, and a rubber cylindrical cover member 66 that covers the operation member 65 and the screwing member 64 is provided.

  As shown in FIG. 3 and the like, the screw member 64 has a cylindrical tubular portion 68, and a circular annular plate portion 69 is directed inward from the inner peripheral surface of the lower end portion of the tubular portion 68. Protrusively. The fixed body 62 is sandwiched between the inward projecting portion 48 of the cylindrical member 42 and the inward projecting annular plate portion 69 of the operating body 61.

  Further, an inner peripheral screw portion 70 that is screwed with the outer peripheral screw portion 47 of the cylindrical member 42 is formed on the inner peripheral surface of the cylindrical portion 68. A plurality of outer peripheral grooves 71 along the axial direction are formed on the outer peripheral surface of the cylindrical portion 68 (see FIG. 1). A plurality of inner peripheral grooves 72 corresponding to the outer peripheral grooves 71 of the screwing member 64 are formed in the lower inner peripheral surface of the operation member 65 along the axial direction.

  In addition, a recessed portion 75 is formed in a predetermined portion of the upper inner peripheral surface of the operation member 65 so as to be cut out from the upper end surface. That is, the concave portion 75 is formed on the upper inner peripheral side of the operation member 65 from the upper end surface of the operation member 65 to the central portion in the vertical direction of the operation member 65. A convex portion 45 on the outer peripheral side of the cylindrical member 42 is inserted into and stored in the concave portion 75 so as to be movable in the circumferential direction of the operation member 65 with respect to the concave portion 75.

  4 and 6 and the like, one of the concave portions 75 of the operating member 65, which has a longitudinally long surface positioned along the radial direction of the operating member 65, is in contact with the convex portion 45. A contact surface 76 that contacts the surface 46 is formed. In addition, the other longitudinally long surface located along the radial direction of the operation member 65 among the recesses 75 of the operation member 65 is a facing surface 77 that faces the facing surface 50 of the convex portion 45 so as to be spaced apart. . Further, an arcuate surface located along the circumferential direction of the operating member 65 in the recess 75 of the operating member 65 is an arcuate surface 78 facing the outer peripheral surface of the cylindrical member 42.

  Note that the contact surface 76 of the concave portion 75 contacts the contact receiving surface 46 of the convex portion 45 when the operating body 61 rotates in the fixing release direction b. At this time, the facing surface 77 of the concave portion 75 does not contact the facing surface 50 of the convex portion 45.

  Further, as shown in FIG. 3 and the like, the cover member 66 has a cylindrical tubular portion 81 that covers the entire outer peripheral surface of the operation member 65. A circular annular upper annular plate portion 82 projects integrally inward from the inner peripheral surface of the upper end portion of the cylindrical portion 81, and the inner peripheral surface of the upper annular plate portion 82 contacts the outer peripheral surface of the upper end portion of the cylindrical member 42. doing. Further, a circular annular lower annular plate portion 83 protrudes inward from the inner peripheral surface of the lower end portion of the tubular portion 81, and the lower annular plate portion 83 covers the lower surface of the screw member 64.

  A first gap 84 exists between the inner peripheral surface of the lower annular plate portion 83 of the cover member 66 and the outer peripheral surface of the lower tubular body 22. Similarly, a second gap 85 that communicates with the first gap 84 exists between the inner peripheral surface of the annular plate portion 69 of the screw member 64 and the outer peripheral surface of the lower tubular body 22. Is closed by a pressed surface 98 described later.

  As shown in FIGS. 2 and 3, etc., the fixed body 62 has a plurality of frustoconical (for example, five) inner circumferential upward inclined surfaces 86 that gradually increase in diameter toward the upper inner circumference. A cylindrical outer member 88 having a plurality of (e.g., five) frusto-cone-shaped inner circumferential downward inclined surfaces 87 on the lower inner peripheral side, which are provided on the side and gradually increase in diameter downward. A cylindrical upper inner member 92 having a plurality of (for example, five) outer peripheral downward inclined surfaces 91 in contact with the upward inclined surface 86 in a planar shape, and an inner peripheral downward inclined surface 87 in a planar shape. And a cylindrical lower inner member 94 having a plurality of (for example, five) outer peripheral upward inclined surfaces 93 on the outer peripheral side.

  An outer member 88 is disposed in the outer peripheral portion of the space between the inner peripheral surface of the cylindrical member 42 and the outer peripheral surface of the lower tubular body 22, and the upper inner member 92 is disposed in the inner peripheral portion of the space. A lower inner member 94 is disposed. That is, the upper and lower inner members 92 and 94 are disposed on the inner peripheral side of one outer member 88 so as to contact the inner peripheral surface of the outer member 88. These upper and lower inner members 92 and 94 are arranged so as not to contact each other, and the lower end surface of the upper inner member 92 and the upper end surface of the lower inner member 94 are spaced apart from each other with a gap 90 therebetween.

  Then, when the operating body 61 is rotated in a fixed direction a which is one direction (for example, a rotating operation of a predetermined angle θ of 90 degrees or less), based on the radially inward force received from the outer member 88. The upper inner member 92 and the lower inner member 94 are elastically reduced in diameter and pressed onto the outer peripheral surface of the lower tubular body 22, whereby the lower tubular body 22 is fixed to the upper tubular body 21.

  Further, when the operation body 61 is rotated in a fixing release direction b which is the other direction opposite to one direction (for example, a rotation operation of a predetermined angle θ of 90 degrees or less), both inner sides are based on the elastic restoring force. The members 92 and 94 are restored to their original shapes, and the upper inner member 92 and the lower inner member 94 are released from the outer peripheral surface of the lower tubular body 22, thereby fixing the lower tubular body 22 to the upper tubular body 21. Canceled. By the release of the fixing, the lower tubular body 22 becomes movable in the axial direction with respect to the upper tubular body 21.

  In addition, the predetermined angle θ when the operating body 61 is rotated with respect to the cylindrical member 42 is 360 degrees or less, for example, 120 to 90 degrees or less, preferably an angle within a range of 40 degrees to 60 degrees, For example, it is 50 degrees. In FIG. 6, a point P is a point on the rotation center axis of the operating body 61, a line L1 passing through the contact surface 76 of the operating body 61 located at the fixed position and the point P, and the cylindrical member 42. The angle formed between the contact receiving surface 46 and the line L2 passing through the point P is a predetermined angle θ.

  Here, the outer member 88 is configured by a plurality of, for example, two divided members 95 divided in the circumferential direction of the outer member 88. The upper end surface of one split member 95 is formed in a step shape, and the lower end surface of the other split member 95 is formed in a step shape. In addition, a plurality of mutually parallel inner circumferential upward inclined surfaces 86 are formed on the upper inner peripheral surface of each divided member 95, and a plurality of parallel inner parallel upper and lower surfaces are formed on the lower inner peripheral surface of each divided member 95. An inner circumferential downward inclined surface 87 is formed. That is, the outer member 88 has saw-shaped peaks of different directions on the inner peripheral side. The outer member 88 and the lower inner member 94 are movable in the vertical direction by a slight amount with respect to the upper tubular body 21 based on the turning operation of the operating body 61.

  The upper inner member 92 has a C-shape with a notch 96 so that it can be easily reduced in diameter, and the outer peripheral surface of the upper inner member 92 corresponds to the inner peripheral upward inclined surface 86. Thus, a plurality of outer peripheral downward inclined surfaces 91 that are parallel to each other are formed vertically. That is, the upper inner member 92 has a saw-like peak on the outer peripheral side. The upper end surface of the upper inner member 92 is always in contact with the inward protruding portion 48 of the cylindrical member 42. Further, the contact between the upper end surface of the upper inner member 92 and the lower end surface of the retaining member 52 prevents the lower tubular body 22 from coming off from the upper tubular body 21.

  Further, the lower inner member 94 also has a C-shape having a notch 97 so as to be easily deformed in diameter as in the case of the upper inner member 92. The outer peripheral surface of the lower inner member 94 has an inner peripheral surface. Corresponding to the downward inclined surface 87, a plurality of parallel outer peripheral upward inclined surfaces 93 arranged in the vertical direction are formed. In other words, the lower inner member 94 has a saw-shaped mountain on the outer peripheral side that is different in direction from the saw-shaped mountain of the upper inner member 92.

  In addition, the lower inner member 94 has a horizontal pressed surface 98 along the direction orthogonal to the axial direction of the lower tubular body 22 at the lower end surface. Then, the pressed surface 98 is pressed upward by the pressing surface 99 of the screw member 64 based on the turning operation of the operating body 61 in the fixing direction. The pressing surface 99 is formed in a planar shape on the upper surface of the annular plate portion 69 of the screw member 64, that is, on the inner peripheral portion of the upper surface of the annular plate portion 69 along the direction orthogonal to the axial direction of the screw member 64, It is always in contact with the pressed surface 98.

  Although the first and second tubular bodies 21 and 22 and the first fixing means 31 have been described, the other tubular bodies 23 to 26 and the fixing means 32 to 35 have the same configuration.

  Here, FIG. 8 is a diagram for explaining a method of manufacturing the cylindrical member 42, and a method of manufacturing the cylindrical member 42 will be described with reference to this drawing.

  The cylindrical member 101 shown in FIG. 8A is made of a metal such as aluminum, and both the inner peripheral surface and the outer peripheral surface are formed in a cylindrical surface shape.

  First, as shown in FIG. 8B, a substantially elliptical convex portion 45 is formed on the outer peripheral surface of the cylindrical member 101 so as to protrude outward by pressing with a press. At the time of this pressing, a substantially elliptical concave portion 102 is formed on the inner peripheral surface of the cylindrical member 101.

  Thereafter, as shown in FIG. 8C, an outer peripheral threaded portion 47 is formed on the outer peripheral surface of the cylindrical member 101 by cutting with a lathe, and a circular annular inward protruding portion 48 is formed on the inner peripheral surface of the cylindrical member 101. Form.

  In this way, the cylindrical member 42 having the convex portion 45, the outer peripheral threaded portion 47, and the inward protruding portion 48 is completed. When attaching the completed tubular member 42 to the upper tubular member 41, the lower end portion of the upper tubular member 41 is tubular until the lower end surface of the upper tubular member 41 contacts the inwardly projecting portion 48 of the tubular member 42. It is inserted into the shaped member 42.

  For example, in a method in which the carbon tripod and the threaded portion are formed separately from the pipe and integrated by joining, the threaded tube is very thick. Therefore, the embossing (convex part) formed in the raw tube does not peel off even when the overlapping part is sufficiently removed.

  The tubular member 42, the tubular members 41 and 51, the retaining member 52, the screwing member 64, and the operation member 65 are made of metal such as aluminum (may be made of carbon), for example, and are outer members that constitute the fixed body 62. 88, the upper inner member 92 and the lower inner member 94 are made of a synthetic resin such as POM, for example.

  Next, the operation and the like of the one embodiment will be described.

  For example, when adjusting the length of the leg 12 of the monopod 11 to a desired length and then fixing the lower tubular body 22 to the upper tubular body 21 with the fixing means 31, the user of the monopod 11 can operate The body 61 is rotated by a predetermined angle θ of 90 degrees or less toward the fixed direction a. That is, the operating body 61 is rotated by a predetermined angle θ in the tightening direction with respect to the cylindrical member 42.

  Then, as shown in FIGS. 5 and 6, the upper inner member 92 and the lower inner member 94 of the fixed body 62 are crimped to the outer peripheral surface of the lower tubular body 22, and the lower tubular body 22 is bonded to the upper tubular body 21 by this crimping. It is fixed against.

  That is, when the operating body 61 is slightly moved upward according to the rotation in the fixing direction a, the pressed surface 98 of the lower inner member 94 is pressed upward by the pressing surface 99 of the operating body 61.

  As a result, the upper inner member 92 and the lower inner member 94 are elastically reduced in diameter based on the radially inward force received from the inclined surfaces 86, 87 of the outer member 88, and both the inner members 92, 94 The inner peripheral surface is pressed against the outer peripheral surface of the lower tubular body 22 and fixed by pressure. At this time, the lower inner member 94 and the outer member 88 move upward by a slight amount with respect to the cylindrical member 42. Since the upper inner member 92 is in contact with the inward projecting portion 48, it does not move upward.

  Thus, the lower tubular body (lower pipe) 22 is fixed to the upper tubular body (upper pipe) 21 by the fixing means 31. When the fixing means 31 is fixed, the lower tubular body 22 is firmly fixed to the upper tubular body 21 with sufficient fixing forces by the upper and lower inner members 92 and 94, and thus rattles. There is no such thing as shaking the head with respect to the upper tubular body 21. That is, for example, as shown in FIG. 7B, even when the leg 12 of the monopod 11 is extended to the maximum length and fixed by the fixing means 31 to 35, the two adjacent tubular bodies 21 to 26 are adjacent to each other. The connecting portion (joint portion) is not bent, and the leg body 12 is kept straight.

  Further, for example, even when the inner peripheral thread portion 70 is rattled with respect to the outer peripheral thread portion 47, the pressing surface 99 of the operating body 61 slides against the pressed surface 98 of the lower inner member 94. A sufficient fixing force by the inner members 92 and 94 is maintained.

  Next, for example, when releasing the fixation by the fixing means 31, the user of the monopod 11 rotates the operation body 61 by a predetermined angle θ of 90 degrees or less in the fixation release direction b. That is, the operating body 61 is rotated by a predetermined angle θ in the loosening direction with respect to the cylindrical member 42.

  Then, as shown in FIGS. 3 and 4, the pressure bonding of the upper inner member 92 and the lower inner member 94 with respect to the outer peripheral surface of the lower tubular body 22 is released, and the fixing to the upper tubular body 21 of the lower tubular body 22 is performed by releasing the pressure bonding. Is released.

  That is, when the operating body 61 is slightly moved downward in accordance with the rotation in the fixing release direction b, the pressing of the pressed surface 98 by the pressing surface 99 of the operating body 61 is released.

  As a result, the upper inner member 92 and the lower inner member 94 return to their original shapes based on the elastic restoring force, and the inner peripheral surfaces of the inner members 92 and 94 are slightly separated from the outer peripheral surface of the lower tubular body 22. In this state, the crimping of the inner members 92 and 94 to the outer peripheral surface is released. At this time, the lower inner member 94 and the outer member 88 move downward by a slight amount with respect to the cylindrical member 42.

  Further, when the operating body 61 is rotated in the fixing release direction b to release the fixing to the upper tubular body 21 of the lower tubular body 22, the contact surface 76 of the concave portion 75 of the operating body 61 has the upper tubular body 21. The abutment surface 46 abuts on the abutment receiving surface 46 of the convex portion 45, and the abutment operation restricts the operation body 61 in the fixing release direction b.

  That is, since the contact surface 76 of the concave portion 75 contacts the contact receiving surface 46 of the convex portion 45, the user does not turn the operation body 61 more than necessary in the fixing release direction b. Is rotated in the fixed release direction b by a predetermined angle θ about the rotation center axis in the vertical direction.

  Thus, the fixing of the lower tubular body 22 to the upper tubular body 21 by the fixing means 31 is released. When the fixing means 31 releases the fixation, the length of the leg 12 of the monopod 11 can be adjusted by moving the lower tubular body 22 relative to the upper tubular body 21.

  According to the above-described embodiment, rattling of the tubular bodies 22 to 26 at the time of fixing by the fixing body 62 of the fixing means 31 to 35 can be prevented. Can be taken.

  The fixed body 62 includes an outer member 88, an upper inner member 92, and a lower inner member 94. The outer member 88 has a plurality of inner peripheral upward inclined surfaces 86 and a plurality of inner peripheral downward inclined surfaces 87. Since the upper inner member 92 has a plurality of outer peripheral downward inclined surfaces 91 and the lower inner member 94 has a plurality of outer peripheral upward inclined surfaces 93, the tubular bodies 22 to 26 at the time of fixing by the fixing means 31 to 35 are provided. The rattle can be prevented appropriately.

  Further, the lower inner member 94 has a pressed surface 98 along the direction orthogonal to the axial direction of the lower tubular body 22 at the lower end surface, and the operating body 61 is a pressing surface that presses the pressed surface 98 of the lower inner member 94. 99, it is not affected by the backlash of the inner peripheral thread portion 70 of the operating body 61 with respect to the outer peripheral thread portion 47 of the upper tubular body 21, and the backlash of the tubular bodies 22 to 26 at the time of fixing by the fixing means 31 to 35 is prevented. This can be prevented more appropriately.

  In addition, the operation body 61 is always fixed to and released from the upper tubular body 21 by rotating the operation body 61 at a predetermined angle θ of 360 degrees (preferably 120 degrees, more preferably 90 degrees) or less. The operability is good.

  Further, when the operation body 61 is rotated to release the fixing of the lower tubular body 22 from the upper tubular body 21, the contact of the contact surface 76 and the contact receiving surface 46 causes the operation body 61 to be released from the unlocking direction. Therefore, it is possible to appropriately prevent the operating body 61 from being turned too far in the fixing release direction.

  In the above embodiment, the case where the telescopic device is the leg 12 of the monopod 11 has been described. However, for example, a tripod leg or a leg other than the leg of the support device may be used.

  Further, the telescopic device is not limited to the configuration including the six tubular bodies 21 to 26 and the five fixing means 31 to 35, and is configured to include at least two tubular bodies 21, 22 and one fixing means 31. I just need it.

  Further, the number of the inner peripheral upward inclined surface 86, the inner peripheral downward inclined surface 87, the outer peripheral downward inclined surface 91, and the outer peripheral upward inclined surface 93 of the fixed body 62 is arbitrary and may be plural. One may be sufficient.

  Further, for example, when the lower tubular body 22 is fixed to the upper tubular body 21 by rotating the operation body 61, the opposed surface 50 of the convex portion 45 of the cylindrical member 42 and the opposed surface of the concave portion 75 of the operating body 61 The configuration may be such that the rotation operation of the operation body 61 in the fixing direction a is restricted by the contact with 77.

  The present invention is used for, for example, an extendable leg body included in a support device.

12 Legs that are telescopic devices
21 Upper tubular body
22 Lower tubular body
31 Fixing means
41 Upper tubular member
42 Tubular member
45 Convex
46 Contact surface
47 External thread
48 Inward protrusion
50 Opposite surface
61 Operation body
62 fixed body
64 screw members
65 operation parts
69 annular plate
70 Inner thread
75 recess
76 Contact surface
77 Opposing surface b Unlocking direction

  The present invention relates to a telescopic device capable of stretching.

  2. Description of the Related Art Conventionally, for example, a support device (such as a tripod or a monopod) that supports a camera is widely known (for example, Patent Document 1).

  This type of support device includes a leg that is a telescopic device that can be expanded and contracted, and this leg has a configuration as shown in FIG. 9, for example.

  The leg 1 shown in FIG. 9 includes an upper tubular body 2, a lower tubular body 3 movably inserted into the upper tubular body 2, and the lower tubular body 3 with respect to the upper tubular body 2. And fixing means 4 for releasably fixing.

  The fixing means 4 has an operation nut 6 screwed to the outer peripheral side of the lower end portion of the upper tubular body 2, and a fixing ring 7 disposed between the operation nut 6 and the lower tubular body 3. doing.

  When the operation nut 6 is rotated in the fixing direction, the fixing ring 7 is pressed against the outer peripheral surface of the lower tubular body 3, whereby the lower tubular body 3 is fixed to the upper tubular body 2. Further, when the operation nut 6 is rotated in the fixing release direction, the fixing of the fixing ring 7 is released, whereby the fixing of the lower tubular body 3 to the upper tubular body 2 is released.

JP 2004-258451 A

  However, in the above-described conventional configuration, when the operation nut 6 is rotated, for example, by 120 degrees in order to release the fixing to the upper tubular body 2 of the lower tubular body 3, in order to fix the operation nut 6 again, the reverse direction of 120 degrees However, if, for example, 5 rotations are required for release, the rotation must be performed 5 times to fix again, and the operability is poor.

  This invention is made | formed in view of such a point, and it aims at providing the expansion / contraction apparatus with favorable operativity.

Stretching apparatus 請 Motomeko 1 described, the upper tubular body, and a lower tubular body inserted to be movable in the upper tubular body, fixing means for releasably securing the lower tubular body with respect to the upper tubular member The fixing means has an operation body that can be rotated, and the upper tubular body of the lower tubular body by a rotation operation of a predetermined angle within a range of 40 degrees to 60 degrees of the operation body. a fixed and telescoping device that releasing is performed on the upper tubular body has a upper tubular member and a cylindrical member fixed to the lower end of the upper tubular member, the operating body, the A screw member that is screwed to the outer peripheral thread portion of the cylindrical member; and an operation member that is attached to the outer peripheral side of the screw member. The upper outer peripheral surface of the cylindrical member includes a contact receiving surface and A convex portion having an opposing surface is formed, and a lower outer peripheral surface of the cylindrical member The outer peripheral threaded portion that is screwed with the inner peripheral threaded portion of the receiving member is formed, and the upper inner peripheral surface of the operation member includes a contact surface that contacts the contact receiving surface and a facing surface that is spaced apart from the facing surface. a recess is formed having, in the recess, the protrusion is inserted movably in a circumferential direction of the operating member relative to the recess, by turning operation of the operating body in the unlocking direction the when releasing the fixing with respect to the upper tubular body of the lower tubular body, said abutment surface of said recess is in contact with the contact receiving surfaces of the convex portion, this abutment against the unlocking direction of the operating body When the rotation operation is restricted and the operation body is rotated in the fixing direction to fix the lower tubular body to the upper tubular body, the opposed surface of the concave portion is opposed to the convex portion. It does not contact the surface .

The telescopic device according to claim 2 is the telescopic device according to claim 1 , wherein the concave portion of the operating member is formed on the upper inner peripheral side of the operating member from the upper end surface of the operating member to the vertical center of the operating member. It is what has been.

Extension device according to claim 3, wherein, in the extension device according to claim 1 or 2, wherein the fixing means is fixed member releasably securing the lower tubular member against the upper tubular body on the basis of the rotational operation of the control member The fixed body is disposed between the inner peripheral surface of the tubular member of the upper tubular body and the outer peripheral surface of the lower tubular body.

The telescopic device according to claim 4 is the telescopic device according to claim 3, wherein the fixed body is an inward projecting portion of the tubular member of the upper tubular body and an inward projecting annular plate portion of the screw member of the operating body. Is sandwiched between.

  According to the present invention, since the operation body is fixed to and released from the upper tubular body by rotating the operation body at a predetermined angle, the operability is good.

It is a disassembled perspective view of the expansion-contraction apparatus (leg body) which concerns on one embodiment of this invention. It is a disassembled perspective view of the fixing body of the fixing means of an expansion / contraction apparatus same as the above. It is sectional drawing at the time of fixation cancellation | release by the fixing means of the expansion / contraction apparatus same as the above (at the time of unlocking). It is AA sectional drawing in FIG. It is sectional drawing at the time of fixation (at the time of a lock | rock) by the fixing means of an expansion-contraction apparatus same as the above. It is BB sectional drawing in FIG. It is a perspective view of the monopod which comprised the same expansion-contraction apparatus same as the above, (a) is a figure of the state contracted, (b) is a figure of the state which extended. (A) thru | or (c) is explanatory drawing for demonstrating the manufacturing method of a cylindrical member. It is sectional drawing of the conventional expansion-contraction apparatus.

  One embodiment of the telescopic device of the present invention will be described with reference to FIGS.

  In FIG. 7, 11 is a monopod as a support device for supporting a supported object (not shown). The supported object is an optical device such as a camera.

  The monopod 11 is attached to an upper end portion of the leg body 12 and a leg body 12 that is a single telescopic device that has a longitudinal direction in the vertical direction and can be expanded and contracted along the longitudinal direction. And a support 13 for supporting the.

  The support 13 includes a disk-shaped support plate 14 that supports a supported object (not shown) such as a camera, and a mounting screw 15 is provided at the center of the support plate 14.

  The leg body 12 is inserted into at least the upper tubular body 21 so as to be movable in the vertical direction (axial direction) into the upper tubular body 21, and protrudes from the lower end of the upper tubular body 21 by movement with respect to the upper tubular body 21. A lower tubular body 22 whose length is adjustable, and a fixing means 31 for releasably fixing the lower tubular body 22 to the upper tubular body 21 are provided.

  That is, for example, in the example shown in FIG. 7, the leg body 12 has a plurality of stages, for example, a six-stage type, and a plurality of, for example, six cylinders (including a substantially cylindrical shape) each having a slightly different diameter size. (Same) first to sixth tubular bodies 21 to 26 and a plurality of, for example, five first to fifth fixing means 31 to 35 provided on the lower ends of the tubular bodies 21 to 25.

  A support 13 is attached to the upper end of the uppermost tubular body 21, and a stone bump 30 is attached to the lower end of the lowermost tubular body 26. A cylindrical foamed rubber grip 29 is fitted on the outer peripheral side of the uppermost tubular body 21.

  Here, as shown in FIGS. 1, 3 to 6, the upper tubular body 21 has an upper portion fitted and fixed to the outer peripheral side of the cylindrical upper tubular member 41 and the lower end portion of the upper tubular member 41. And a cylindrical member (cylindrical portion) 42 having a cylindrical shape. For example, the upper tubular member 41 and the tubular member 42 may be integrally formed.

  On the inner peripheral surface of the upper tubular member 41, two vertically extending protrusions 43 that are spaced apart from each other and are opposed to each other are formed.

  A convex portion 45 that is a substantially elliptical contact receiving portion having a longitudinal direction in the vertical direction is formed at one location on the upper outer peripheral surface of the cylindrical member 42. The convex portion 45 is formed on the upper outer peripheral side of the cylindrical member 42 from the vicinity of the upper end portion of the cylindrical member 42 to the vicinity of the central portion in the vertical direction of the cylindrical member 42. The convex portion 45 has an abutting receiving surface 46 that is vertically long on one surface (front surface in the fixing direction a) along the vertical direction (see FIG. 6). Note that the surface of the convex portion 45 opposite to the contact receiving surface 46, that is, the other surface along the vertical direction (front surface in the fixing release direction b) is the facing surface 50.

  An outer peripheral thread portion 47 formed of a spiral groove is formed on the lower outer peripheral surface of the cylindrical member 42. A circular annular inward projecting portion 48 along the circumferential direction of the cylindrical member 42 is formed on the inner peripheral surface of the cylindrical member 42 in the center in the vertical direction.

  As shown in FIGS. 1, 3 to 6, the lower tubular member 22 includes a cylindrical lower tubular member 51 having a smaller diameter than the upper tubular member 41, and the outer periphery of the upper end portion of the lower tubular member 51. It has a cylindrical retaining member (preventing part) 52 that is fitted and fixed to the side and prevents the lower tubular body 22 from coming out of the upper tubular body 21. For example, the lower tubular member 51 and the retaining member 52 may be configured integrally.

  On the inner peripheral surface of the lower tubular member 51, two vertically extending projections 53 for preventing rotation are formed so as to be spaced apart from each other. A cylindrical member (not shown) similar to the cylindrical member 42 is fixed to the outer peripheral side of the lower end portion of the lower tubular member 51.

  The retaining member 52 includes a plurality of, for example, two curved plate-shaped divided members 54 that are divided in the circumferential direction by the retaining member 52. Each divided member 54 has a circular insertion convex portion 55 on the inner surface side, and this insertion convex portion 55 is inserted into the hole 56 at the upper end portion of the lower tubular member 51. Note that the protruding portion 43 of the upper tubular member 41 is inserted between the opposed end portions of the two split members 54.

  As shown in FIGS. 1 to 6, the fixing means 31 is screwed to the outer peripheral side of the lower end portion of the upper tubular body 21, that is, the outer peripheral threaded portion 47 of the cylindrical member 42, and is fixed to the cylindrical member 42. A cylindrical operation body 61 that can be rotated about a vertical rotation center axis, an inner peripheral surface of the lower end portion of the upper tubular body 21 (an inner peripheral surface of the cylindrical member 42), and an outer peripheral surface of the lower tubular body 22 And a cylindrical fixing body 62 that releasably fixes the lower tubular body 22 to the upper tubular body 21 based on a turning operation of the operating body 61. The fixed body 62 is sandwiched between the inward projecting portion 48 of the cylindrical member 42 and the inward projecting annular plate portion 69 of the operating body 61.

  The operating body 61 includes, for example, a screw member 64 that is a cylindrical lock nut screwed to the outer peripheral thread portion 47 of the cylindrical member 42 of the upper tubular body 21, and a spline fitting on the outer peripheral side of the screw member 64. The cylindrical operation member 65 is attached to the outer peripheral side of the operation member 65, and a rubber cylindrical cover member 66 that covers the operation member 65 and the screwing member 64 is provided.

  As shown in FIG. 3 and the like, the screw member 64 has a cylindrical tubular portion 68, and a circular annular plate portion 69 is directed inward from the inner peripheral surface of the lower end portion of the tubular portion 68. Protrusively. The fixed body 62 is sandwiched between the inward projecting portion 48 of the cylindrical member 42 and the inward projecting annular plate portion 69 of the operating body 61.

  Further, an inner peripheral screw portion 70 that is screwed with the outer peripheral screw portion 47 of the cylindrical member 42 is formed on the inner peripheral surface of the cylindrical portion 68. A plurality of outer peripheral grooves 71 along the axial direction are formed on the outer peripheral surface of the cylindrical portion 68 (see FIG. 1). A plurality of inner peripheral grooves 72 corresponding to the outer peripheral grooves 71 of the screwing member 64 are formed in the lower inner peripheral surface of the operation member 65 along the axial direction.

  In addition, a recessed portion 75 is formed in a predetermined portion of the upper inner peripheral surface of the operation member 65 so as to be cut out from the upper end surface. That is, the concave portion 75 is formed on the upper inner peripheral side of the operation member 65 from the upper end surface of the operation member 65 to the central portion in the vertical direction of the operation member 65. A convex portion 45 on the outer peripheral side of the cylindrical member 42 is inserted into and stored in the concave portion 75 so as to be movable in the circumferential direction of the operation member 65 with respect to the concave portion 75.

  4 and 6 and the like, one of the concave portions 75 of the operating member 65, which has a longitudinally long surface positioned along the radial direction of the operating member 65, is in contact with the convex portion 45. A contact surface 76 that contacts the surface 46 is formed. In addition, the other longitudinally long surface located along the radial direction of the operation member 65 among the recesses 75 of the operation member 65 is a facing surface 77 that faces the facing surface 50 of the convex portion 45 so as to be spaced apart. . Further, an arcuate surface located along the circumferential direction of the operating member 65 in the recess 75 of the operating member 65 is an arcuate surface 78 facing the outer peripheral surface of the cylindrical member 42.

  Note that the contact surface 76 of the concave portion 75 contacts the contact receiving surface 46 of the convex portion 45 when the operating body 61 rotates in the fixing release direction b. At this time, the facing surface 77 of the concave portion 75 does not contact the facing surface 50 of the convex portion 45.

  Further, as shown in FIG. 3 and the like, the cover member 66 has a cylindrical tubular portion 81 that covers the entire outer peripheral surface of the operation member 65. A circular annular upper annular plate portion 82 projects integrally inward from the inner peripheral surface of the upper end portion of the cylindrical portion 81, and the inner peripheral surface of the upper annular plate portion 82 contacts the outer peripheral surface of the upper end portion of the cylindrical member 42. doing. Further, a circular annular lower annular plate portion 83 protrudes inward from the inner peripheral surface of the lower end portion of the tubular portion 81, and the lower annular plate portion 83 covers the lower surface of the screw member 64.

  A first gap 84 exists between the inner peripheral surface of the lower annular plate portion 83 of the cover member 66 and the outer peripheral surface of the lower tubular body 22. Similarly, a second gap 85 that communicates with the first gap 84 exists between the inner peripheral surface of the annular plate portion 69 of the screw member 64 and the outer peripheral surface of the lower tubular body 22. Is closed by a pressed surface 98 described later.

  As shown in FIGS. 2 and 3, etc., the fixed body 62 has a plurality of frustoconical (for example, five) inner circumferential upward inclined surfaces 86 that gradually increase in diameter toward the upper inner circumference. A cylindrical outer member 88 having a plurality of (e.g., five) frusto-cone-shaped inner circumferential downward inclined surfaces 87 on the lower inner peripheral side, which are provided on the side and gradually increase in diameter downward. A cylindrical upper inner member 92 having a plurality of (for example, five) outer peripheral downward inclined surfaces 91 in contact with the upward inclined surface 86 in a planar shape, and an inner peripheral downward inclined surface 87 in a planar shape. And a cylindrical lower inner member 94 having a plurality of (for example, five) outer peripheral upward inclined surfaces 93 on the outer peripheral side.

  An outer member 88 is disposed in the outer peripheral portion of the space between the inner peripheral surface of the cylindrical member 42 and the outer peripheral surface of the lower tubular body 22, and the upper inner member 92 is disposed in the inner peripheral portion of the space. A lower inner member 94 is disposed. That is, the upper and lower inner members 92 and 94 are disposed on the inner peripheral side of one outer member 88 so as to contact the inner peripheral surface of the outer member 88. These upper and lower inner members 92 and 94 are arranged so as not to contact each other, and the lower end surface of the upper inner member 92 and the upper end surface of the lower inner member 94 are spaced apart from each other with a gap 90 therebetween.

  Then, when the operating body 61 is rotated in a fixed direction a which is one direction (for example, a rotating operation of a predetermined angle θ of 90 degrees or less), based on the radially inward force received from the outer member 88. The upper inner member 92 and the lower inner member 94 are elastically reduced in diameter and pressed onto the outer peripheral surface of the lower tubular body 22, whereby the lower tubular body 22 is fixed to the upper tubular body 21.

  Further, when the operation body 61 is rotated in a fixing release direction b which is the other direction opposite to one direction (for example, a rotation operation of a predetermined angle θ of 90 degrees or less), both inner sides are based on the elastic restoring force. The members 92 and 94 are restored to their original shapes, and the upper inner member 92 and the lower inner member 94 are released from the outer peripheral surface of the lower tubular body 22, thereby fixing the lower tubular body 22 to the upper tubular body 21. Canceled. By the release of the fixing, the lower tubular body 22 becomes movable in the axial direction with respect to the upper tubular body 21.

  In addition, the predetermined angle θ when the operating body 61 is rotated with respect to the cylindrical member 42 is 360 degrees or less, for example, 120 to 90 degrees or less, preferably an angle within a range of 40 degrees to 60 degrees, For example, it is 50 degrees. In FIG. 6, a point P is a point on the rotation center axis of the operating body 61, a line L1 passing through the contact surface 76 of the operating body 61 located at the fixed position and the point P, and the cylindrical member 42. The angle formed between the contact receiving surface 46 and the line L2 passing through the point P is a predetermined angle θ.

  Here, the outer member 88 is configured by a plurality of, for example, two divided members 95 divided in the circumferential direction of the outer member 88. The upper end surface of one split member 95 is formed in a step shape, and the lower end surface of the other split member 95 is formed in a step shape. In addition, a plurality of mutually parallel inner circumferential upward inclined surfaces 86 are formed on the upper inner peripheral surface of each divided member 95, and a plurality of parallel inner parallel upper and lower surfaces are formed on the lower inner peripheral surface of each divided member 95. An inner circumferential downward inclined surface 87 is formed. That is, the outer member 88 has saw-shaped peaks of different directions on the inner peripheral side. The outer member 88 and the lower inner member 94 are movable in the vertical direction by a slight amount with respect to the upper tubular body 21 based on the turning operation of the operating body 61.

  The upper inner member 92 has a C-shape with a notch 96 so that it can be easily reduced in diameter, and the outer peripheral surface of the upper inner member 92 corresponds to the inner peripheral upward inclined surface 86. Thus, a plurality of outer peripheral downward inclined surfaces 91 that are parallel to each other are formed vertically. That is, the upper inner member 92 has a saw-like peak on the outer peripheral side. The upper end surface of the upper inner member 92 is always in contact with the inward protruding portion 48 of the cylindrical member 42. Further, the contact between the upper end surface of the upper inner member 92 and the lower end surface of the retaining member 52 prevents the lower tubular body 22 from coming off from the upper tubular body 21.

  Further, the lower inner member 94 also has a C-shape having a notch 97 so as to be easily deformed in diameter as in the case of the upper inner member 92. The outer peripheral surface of the lower inner member 94 has an inner peripheral surface. Corresponding to the downward inclined surface 87, a plurality of parallel outer peripheral upward inclined surfaces 93 arranged in the vertical direction are formed. In other words, the lower inner member 94 has a saw-shaped mountain on the outer peripheral side that is different in direction from the saw-shaped mountain of the upper inner member 92.

  In addition, the lower inner member 94 has a horizontal pressed surface 98 along the direction orthogonal to the axial direction of the lower tubular body 22 at the lower end surface. Then, the pressed surface 98 is pressed upward by the pressing surface 99 of the screw member 64 based on the turning operation of the operating body 61 in the fixing direction. The pressing surface 99 is formed in a planar shape on the upper surface of the annular plate portion 69 of the screw member 64, that is, on the inner peripheral portion of the upper surface of the annular plate portion 69 along the direction orthogonal to the axial direction of the screw member 64, It is always in contact with the pressed surface 98.

  Although the first and second tubular bodies 21 and 22 and the first fixing means 31 have been described, the other tubular bodies 23 to 26 and the fixing means 32 to 35 have the same configuration.

  Here, FIG. 8 is a diagram for explaining a method of manufacturing the cylindrical member 42, and a method of manufacturing the cylindrical member 42 will be described with reference to this drawing.

  The cylindrical member 101 shown in FIG. 8A is made of a metal such as aluminum, and both the inner peripheral surface and the outer peripheral surface are formed in a cylindrical surface shape.

  First, as shown in FIG. 8B, a substantially elliptical convex portion 45 is formed on the outer peripheral surface of the cylindrical member 101 so as to protrude outward by pressing with a press. At the time of this pressing, a substantially elliptical concave portion 102 is formed on the inner peripheral surface of the cylindrical member 101.

  Thereafter, as shown in FIG. 8C, an outer peripheral threaded portion 47 is formed on the outer peripheral surface of the cylindrical member 101 by cutting with a lathe, and a circular annular inward protruding portion 48 is formed on the inner peripheral surface of the cylindrical member 101. Form.

  In this way, the cylindrical member 42 having the convex portion 45, the outer peripheral threaded portion 47, and the inward protruding portion 48 is completed. When attaching the completed tubular member 42 to the upper tubular member 41, the lower end portion of the upper tubular member 41 is tubular until the lower end surface of the upper tubular member 41 contacts the inwardly projecting portion 48 of the tubular member 42. It is inserted into the shaped member 42.

  For example, in a method in which the carbon tripod and the threaded portion are formed separately from the pipe and integrated by joining, the threaded tube is very thick. Therefore, the embossing (convex part) formed in the raw tube does not peel off even when the overlapping part is sufficiently removed.

  The tubular member 42, the tubular members 41 and 51, the retaining member 52, the screwing member 64, and the operation member 65 are made of metal such as aluminum (may be made of carbon), for example, and are outer members that constitute the fixed body 62. 88, the upper inner member 92 and the lower inner member 94 are made of a synthetic resin such as POM, for example.

  Next, the operation and the like of the one embodiment will be described.

  For example, when adjusting the length of the leg 12 of the monopod 11 to a desired length and then fixing the lower tubular body 22 to the upper tubular body 21 with the fixing means 31, the user of the monopod 11 can operate The body 61 is rotated by a predetermined angle θ of 90 degrees or less toward the fixed direction a. That is, the operating body 61 is rotated by a predetermined angle θ in the tightening direction with respect to the cylindrical member 42.

  Then, as shown in FIGS. 5 and 6, the upper inner member 92 and the lower inner member 94 of the fixed body 62 are crimped to the outer peripheral surface of the lower tubular body 22, and the lower tubular body 22 is bonded to the upper tubular body 21 by this crimping. It is fixed against.

  That is, when the operating body 61 is slightly moved upward according to the rotation in the fixing direction a, the pressed surface 98 of the lower inner member 94 is pressed upward by the pressing surface 99 of the operating body 61.

  As a result, the upper inner member 92 and the lower inner member 94 are elastically reduced in diameter based on the radially inward force received from the inclined surfaces 86, 87 of the outer member 88, and both the inner members 92, 94 The inner peripheral surface is pressed against the outer peripheral surface of the lower tubular body 22 and fixed by pressure. At this time, the lower inner member 94 and the outer member 88 move upward by a slight amount with respect to the cylindrical member 42. Since the upper inner member 92 is in contact with the inward projecting portion 48, it does not move upward.

  Thus, the lower tubular body (lower pipe) 22 is fixed to the upper tubular body (upper pipe) 21 by the fixing means 31. When the fixing means 31 is fixed, the lower tubular body 22 is firmly fixed to the upper tubular body 21 with sufficient fixing forces by the upper and lower inner members 92 and 94, and thus rattles. There is no such thing as shaking the head with respect to the upper tubular body 21. That is, for example, as shown in FIG. 7B, even when the leg 12 of the monopod 11 is extended to the maximum length and fixed by the fixing means 31 to 35, the two adjacent tubular bodies 21 to 26 are adjacent to each other. The connecting portion (joint portion) is not bent, and the leg body 12 is kept straight.

  Further, for example, even when the inner peripheral thread portion 70 is rattled with respect to the outer peripheral thread portion 47, the pressing surface 99 of the operating body 61 slides against the pressed surface 98 of the lower inner member 94. A sufficient fixing force by the inner members 92 and 94 is maintained.

  Next, for example, when releasing the fixation by the fixing means 31, the user of the monopod 11 rotates the operation body 61 by a predetermined angle θ of 90 degrees or less in the fixation release direction b. That is, the operating body 61 is rotated by a predetermined angle θ in the loosening direction with respect to the cylindrical member 42.

  Then, as shown in FIGS. 3 and 4, the pressure bonding of the upper inner member 92 and the lower inner member 94 with respect to the outer peripheral surface of the lower tubular body 22 is released, and the fixing to the upper tubular body 21 of the lower tubular body 22 is performed by releasing the pressure bonding. Is released.

  That is, when the operating body 61 is slightly moved downward in accordance with the rotation in the fixing release direction b, the pressing of the pressed surface 98 by the pressing surface 99 of the operating body 61 is released.

  As a result, the upper inner member 92 and the lower inner member 94 return to their original shapes based on the elastic restoring force, and the inner peripheral surfaces of the inner members 92 and 94 are slightly separated from the outer peripheral surface of the lower tubular body 22. In this state, the crimping of the inner members 92 and 94 to the outer peripheral surface is released. At this time, the lower inner member 94 and the outer member 88 move downward by a slight amount with respect to the cylindrical member 42.

  Further, when the operating body 61 is rotated in the fixing release direction b to release the fixing to the upper tubular body 21 of the lower tubular body 22, the contact surface 76 of the concave portion 75 of the operating body 61 has the upper tubular body 21. The abutment surface 46 abuts on the abutment receiving surface 46 of the convex portion 45, and the abutment operation restricts the operation body 61 in the fixing release direction b.

  That is, since the contact surface 76 of the concave portion 75 contacts the contact receiving surface 46 of the convex portion 45, the user does not turn the operation body 61 more than necessary in the fixing release direction b. Is rotated in the fixed release direction b by a predetermined angle θ about the rotation center axis in the vertical direction.

  Thus, the fixing of the lower tubular body 22 to the upper tubular body 21 by the fixing means 31 is released. When the fixing means 31 releases the fixation, the length of the leg 12 of the monopod 11 can be adjusted by moving the lower tubular body 22 relative to the upper tubular body 21.

  According to the above-described embodiment, rattling of the tubular bodies 22 to 26 at the time of fixing by the fixing body 62 of the fixing means 31 to 35 can be prevented. Can be taken.

  The fixed body 62 includes an outer member 88, an upper inner member 92, and a lower inner member 94. The outer member 88 has a plurality of inner peripheral upward inclined surfaces 86 and a plurality of inner peripheral downward inclined surfaces 87. Since the upper inner member 92 has a plurality of outer peripheral downward inclined surfaces 91 and the lower inner member 94 has a plurality of outer peripheral upward inclined surfaces 93, the tubular bodies 22 to 26 at the time of fixing by the fixing means 31 to 35 are provided. The rattle can be prevented appropriately.

  Further, the lower inner member 94 has a pressed surface 98 along the direction orthogonal to the axial direction of the lower tubular body 22 at the lower end surface, and the operating body 61 is a pressing surface that presses the pressed surface 98 of the lower inner member 94. 99, it is not affected by the backlash of the inner peripheral thread portion 70 of the operating body 61 with respect to the outer peripheral thread portion 47 of the upper tubular body 21, and the backlash of the tubular bodies 22 to 26 at the time of fixing by the fixing means 31 to 35 is prevented. This can be prevented more appropriately.

  In addition, the operation body 61 is always fixed to and released from the upper tubular body 21 by rotating the operation body 61 at a predetermined angle θ of 360 degrees (preferably 120 degrees, more preferably 90 degrees) or less. The operability is good.

  Further, when the operation body 61 is rotated to release the fixing of the lower tubular body 22 from the upper tubular body 21, the contact of the contact surface 76 and the contact receiving surface 46 causes the operation body 61 to be released from the unlocking direction. Therefore, it is possible to appropriately prevent the operating body 61 from being turned too far in the fixing release direction.

  In the above embodiment, the case where the telescopic device is the leg 12 of the monopod 11 has been described. However, for example, a tripod leg or a leg other than the leg of the support device may be used.

  Further, the telescopic device is not limited to the configuration including the six tubular bodies 21 to 26 and the five fixing means 31 to 35, and is configured to include at least two tubular bodies 21, 22 and one fixing means 31. I just need it.

  Further, the number of the inner peripheral upward inclined surface 86, the inner peripheral downward inclined surface 87, the outer peripheral downward inclined surface 91, and the outer peripheral upward inclined surface 93 of the fixed body 62 is arbitrary and may be plural. One may be sufficient.

  Further, for example, when the lower tubular body 22 is fixed to the upper tubular body 21 by rotating the operation body 61, the opposed surface 50 of the convex portion 45 of the cylindrical member 42 and the opposed surface of the concave portion 75 of the operating body 61 The configuration may be such that the rotation operation of the operation body 61 in the fixing direction a is restricted by the contact with 77.

  The present invention is used for, for example, an extendable leg body included in a support device.

12 Legs that are telescopic devices
21 Upper tubular body
22 Lower tubular body
31 Fixing means
41 Upper tubular member
42 Tubular member
45 Convex
46 Contact surface
47 External thread
48 Inward protrusion
50 Opposite surface
61 Operation body
62 Fixed body
64 Threaded member
65 Control members
69 Annular plate
70 Inner thread
75 recess
76 Contact surface
77 Opposite surface
a Fixing direction b Fixing release direction

Claims (5)

An upper tubular body;
A lower tubular body movably inserted into the upper tubular body;
Fixing means for releasably fixing the lower tubular body to the upper tubular body,
The fixing means has an operation body that can be rotated,
The expansion / contraction apparatus, wherein the lower tubular body is fixed to and released from the upper tubular body by a rotation operation of the operation body at a predetermined angle. The expansion / contraction apparatus according to claim 1, wherein the operation body is fixed to and released from the upper tubular body by rotating the operation body at a predetermined angle of 360 degrees or less. The upper tubular body has a contact receiving surface,
The operating body has a contact surface that contacts the contact receiving surface,
When the lower tubular body is released from being fixed to the upper tubular body, the rotation operation of the operating body in the fixing release direction is restricted by the contact between the contact surface and the contact receiving surface. The telescopic device according to claim 1 or 2. The upper tubular body has a convex portion having a contact receiving surface on the outer peripheral side,
The operating body has a concave portion on the inner peripheral side where the convex portion is inserted and has a contact surface,
When the fixing of the lower tubular body to the upper tubular body is released, the contact surface of the concave portion comes into contact with the contact receiving surface of the convex portion, and by this contact, the operation body is rotated in the fixing release direction. The telescopic device according to any one of claims 1 to 3, wherein the telescopic device is regulated. In the upper tubular body, a convex portion having a contact receiving surface is formed on the outer peripheral surface, an outer peripheral screw portion that engages with an inner peripheral screw portion of the operating body is formed on the outer peripheral surface, and an inward protruding portion is formed on the inner peripheral surface. Having a cylindrical member formed on the surface;
The cylindrical member is formed by pressing the convex portion and then forming the inward protruding portion on an inner peripheral surface by cutting and forming the outer peripheral screw portion on the outer peripheral surface by cutting. The telescopic device according to claim 4.

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