Position adjustment mechanism

Abstract

To simplify a configuration and improve operability in a position adjustment mechanism that can adjust a relative position between two members.SOLUTION: A position adjustment mechanism includes: a holder member 5 fixed to an attachment object 3; a movable member 6 slidably held on the attachment object 3 via the holder member 5; and a rotating operation element 7 engageable with the movable member 6 in a predetermined rotation position to prevent the sliding movement of the movable member 6. The holder 5 includes an operation element receiving hole 14 in which the rotating operation element 7 is rotatably held. The rotating operation element 7 is sandwiched between a circumferential edge portion of the operation element receiving hole 14 and the movable member 6 and is thus rotatably held on the holder member 5 in a coming-off prevention state. The movable member 6 includes a plurality of operation element engagement portions 16 disposed in the slide direction. The operation element engagement portions are engaged with the rotating operation element 7 when the rotating operation element 7 is rotated to a lock position, and are disengaged from the rotating operation element 7 when the rotating operation element 7 is rotated to an unlock position.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a position adjustment mechanism that can adjust the relative positions of two members. [Background technology]

[0002] There are known child bicycle seats for carrying children on bicycles that have a position adjustment mechanism that allows the height position of the headrest to be adjusted to suit the child's sitting height (for example, Patent Documents 1 and 2).

[0003] The position adjustment mechanism in Patent Document 1 includes a support leg extending from the bottom of the headrest, a retaining tubular part provided on the rear wall of the backrest of the seat body, and a fastener penetrating between the support leg and the retaining tubular part. The fastener has an operating knob, a bolt inserted between the support leg and the retaining tubular part, and a nut screwed onto the tip of the bolt, and is configured so that the headrest is supported and fixed to the seat body by fastening the support leg and the retaining tubular part together from the front and rear directions with the fastener.

[0004] The position adjustment mechanism of Patent Document 2 includes a stem extending from the lower part of the headrest member, two mounting ribs formed parallel to the left and right along the rear wall of the child seat body, and a lock handle rotatably attached to the rear wall. The lock handle has a key portion serving as an operating knob, a shaft portion inserted into an elongated hole provided in the stem, and a circular plate engaging with the rear wall from the opposite side to the key portion. The headrest member is supported and fixed to the child seat body by moving the stem portion vertically within the range of the elongated hole and rotating the key portion of the lock handle in a direction intersecting with the elongated hole at any position. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2007-203874 [Patent Document 2] JP 2007-125993 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the position adjustment mechanism of Patent Document 1, adjusting the height of the headrest requires a procedure of loosening the fasteners, sliding the headrest up or down to the desired position, and then tightening the fasteners again, which is time-consuming and requires a certain amount of operating force when tightening. Moreover, this mechanism is configured so that the support legs and the holding tube are clamped from the front and back by the operating knobs and nuts of the fasteners, which increases the number of parts.

[0007] Similarly, the position adjustment mechanism of Patent Document 2 has the problem of requiring a large number of parts because the stem and rear wall are sandwiched between the key and disk of the lock handle from the front and rear. Furthermore, this mechanism is configured so that the key can be removed from the slot by rotating the key in a direction (vertical) that aligns the longitudinal direction of the key with the extension direction of the slot in the stem, thereby tilting the headrest member rearward of the rear wall. Therefore, when the key is rotated vertically to adjust the height of the headrest, the headrest member may unintentionally tilt rearward of the rear wall.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to simplify the overall structure and improve operability in a position adjustment mechanism that can adjust the relative positions of two members. . [Means for solving the problem]

[0009] In order to solve the above problems, the position adjustment mechanism of the present invention employs the following technical means.

[0010] The present invention provides a position adjustment mechanism for an attachment object and a movable member, the position adjustment mechanism comprising: a holder member fixed to an attachment object; a movable member held slidably relative to the attachment object via the holder member; and a rotary operator that engages with the movable member at a predetermined rotation position and can prevent the movable member from sliding, The sliding direction of the movable member is defined as a vertical direction, the extension direction of a virtual axis that is perpendicular to the sliding direction and passes through the rotation center of the rotary operator is defined as a front-rear direction, and the directions that are perpendicular to both the sliding direction and the extension direction are defined as left-right directions, The holder member has an operator receiving hole that rotatably holds the rotary operator, and the rotary operator is a flange portion annularly provided along the outer periphery of the operator body; and a pair of connecting frame portions extending in the front-rear direction at the front end of the operator body and arranged opposite to each other in the direction of the rotational diameter, the operator body being inserted into the operator receiving hole, and the flange portion being brought into contact with and engaged with the periphery of the operator receiving hole from the movable member side, The peripheral portion and the movable member From the front-to-rear direction By being clamped, the movable member is rotatably held in a locked state relative to the holder member, and the movable member is top and bottom When the rotary operator is rotated to a predetermined lock position, Connecting frame part When the rotary operator is rotated to a predetermined unlock position, Connecting frame part The operating element engaging portion is characterized by being in a disengaged state with respect to the operating element engaging portion.

[0011] Preferably, the rotary operator is The operating element engaging portion is in the disengaged state, The movable member in the vertical direction The operating element has a pressing element that can be elastically pressed into contact with the operating element engaging portion when slid.

[0012] Preferably ,before The operating element engaging portion is formed on a surface of the movable member facing the rotary operating element, and has a pair of holding frame portions disposed opposite to each other in the left-right direction. ,before When the rotary operator is in the locked position, the connecting frame overlaps the holding frame, thereby note taker When the rotary operator is in the unlocked position, the overlap between the connecting frame and the holding frame is released, and the front Record and non-record The engagement state is reached.

[0013] Preferably, either the holder member or the rotary operator has an engaging element that can elastically engage with an engaging portion provided on the other of the holder member or the rotary operator when the rotary operator is rotated to the locked position and when the rotary operator is rotated to the unlocked position. [Effects of the Invention]

[0014] The position adjustment mechanism of the present invention has a relatively simple configuration and makes it possible to easily slide or restrict the sliding movement of the movable member, thereby providing a position adjustment mechanism with a simple overall structure and good operability. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a rear perspective view of a child bicycle seat equipped with a position adjustment mechanism according to an embodiment of the present invention; [Figure 2] FIG. 2 is a rear view of the position adjustment mechanism according to the embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the position adjustment mechanism according to the embodiment. [Figure 4] FIG. 2 is a central vertical cross-sectional view of the position adjustment mechanism according to the embodiment. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a position adjustment mechanism according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of a specific embodiment of the present invention, and the configuration of the present invention is not limited to this specific example.

[0017] As shown in Fig. 1, the position adjustment mechanism 1 of this embodiment is provided on the backrest 3A of the seat body 3 of a child bicycle seat 2, and is configured to be able to adjust the height position of the headrest 4 relative to the seat body 3 up and down. In other words, this embodiment is an example in which the position adjustment mechanism 1 is applied to a child bicycle seat 2. In more detail, the position adjustment mechanism 1 includes a pillar holder 5 as a holder member fixed to the seat body 3 to which it is attached, a pillar 6 as a movable member held slidably relative to the seat body 3 via the pillar holder 5, and a rotation operator 7 that is rotatably held by the pillar holder 5, engages with the pillar 6 at a predetermined rotation position, and is able to prevent the pillar 6 from sliding.

[0018] The backrest 3A of the seat body 3 is formed to stand upright, tilting backward from the rear of the seat 3B, and the support pillar 6 is held by the support pillar holder 5 so that it can slide in approximately the same direction as the extension direction of the backrest 3A. When the child bicycle seat 2 is attached to the bicycle (not shown) in the correct orientation, the rotation operator 7 is rotatably held by the support pillar holder 5 so that an imaginary axis passing through the center of rotation is perpendicular to the extension direction of the backrest 3A from the front-to-rear direction of the child bicycle seat 2. Therefore, in the description of this embodiment, the sliding direction of the support pillar 6 is defined as the up-and-down direction of the position adjustment mechanism 1, the extension direction of the imaginary axis of the rotation operator 7 is defined as the front-to-rear direction of the position adjustment mechanism 1, and the direction perpendicular to both the sliding direction and the extension direction of the imaginary axis is defined as the left-to-right direction of the position adjustment mechanism 1.

[0019] 1 to 4, the support pole holder 5 includes a holder main body 8 having a substantially rectangular box shape, a pair of support plate portions 9 extending outwardly to the left and right from the left and right side walls of the holder main body 8, a base portion 10 extending downward along the lower edge of the holder main body 8, and a hook piece 11 extending upward from the upper edge of the support plate portion 9. The base portion 10 is also provided with a screw insertion hole 12 through which a fixing screw 5E can be inserted, and the support pole holder 5 is fixed to the backrest portion 3A of the seat main body 3 by the fixing screw 5E.

[0020] In more detail, the backrest portion 3A of the child bicycle seat 2 is provided with a plurality of through holes 3H into which the hook pieces 11 provided on the support pole holder 5 can be inserted and hooked, and screw holes (not shown) into which fixing screws 5E can be screwed and connected.The support pole holder 5 is fixedly held to the backrest portion 3A by inserting and hooking the hook pieces 11 into the through holes 3H of the backrest portion 3A from the rear, and then screwing and connecting the fixing screws 5E into the screw holes of the backrest portion 3A through the screw insertion holes 12 of the base portion 10.

[0021] The holder main body 8 has pillar insertion holes 13A and 13B at the top and bottom, respectively, through which the pillars 6 can be inserted. The pillar insertion holes 13A and 13B are formed in a generally rectangular shape that is long in the left-right direction, and communicate vertically through the inner space of the holder main body 8. That is, the holder main body 8 has generally rectangular through-holes that open at the top and bottom.

[0022] The rear wall 8R of the holder main body 8 is formed in a generally flat shape that extends in the vertical and horizontal directions. An operator receiving hole 14 that rotatably holds the rotary operator 7 is provided in a generally central position between the vertical and horizontal directions of the rear wall 8R. The operator receiving hole 14 is formed in a generally circular shape and opens from the through hole of the holder main body 8 toward the rear of the rear wall 8R.

[0023] The inner periphery of the operator receiving hole 14 is provided with an engaging element 15 that can elastically engage with a groove 25 provided in the rotary operator 7. The engaging elements 15 are provided at two positions, one above the other, on the inner periphery of the operator receiving hole 14, facing each other. The base end of the engaging element 15 is in contact with the inner periphery wall of the operator receiving hole 14. When the protrusion comes into contact with the outer peripheral surface of the rotary operator 7, it elastically deforms radially outward in the direction of rotation. On the other hand, when the protrusion is fitted into the groove 25 of the rotary operator 7, it returns to its original state before elastic deformation.

[0024] A belt loop hole 9H is provided in the approximate center between the top and bottom of the support plate portion 9. The belt loop hole 9H is formed in an approximately bullet shape that narrows from the bottom end to the top end. This shape allows the safety belt (not shown) to be held in a state where it is slightly bent from the short side direction, preventing the safety belt from easily slipping in the long side direction.

[0025] The base 10 is provided at a position forward of the rear wall 8R of the holder main body 8, extending between the left and right side surfaces of the holder main body 8. The screw insertion hole 12 is opened in the center between the left and right sides of the base 10. The support post insertion hole 13B on the lower side of the holder main body 8 is formed along the rear surface of the base 10.

[0026] 1 to 5, the support pillar 6 is a plate body that is long in the vertical direction and has a generally U-shaped cross section, and extends downward from the center between the left and right sides of the lower edge of the headrest 4, and is inserted from above into the support pillar insertion holes 13A, 13B of the holder main body 8. The support pillar 6 is formed with approximately the same front-to-back and left-to-right widths as the support pillar insertion holes 13A, 13B, and is held by the inner peripheral edges of the support pillar insertion holes 13A, 13B with a predetermined frictional resistance so as to be able to slide up and down.

[0027] The surface of the support pillar 6 facing the rotary operator 7, i.e., the rear surface (hereinafter referred to as the "support pillar rear surface") 6R, is provided with an operator engagement portion 16 that can engage with the rotary operator 7. A plurality of operator engagement portions 16 are arranged side by side at a predetermined interval in the vertical direction in a central position between the left and right sides of the support pillar rear surface 6R, and the user can adjust the height position of the headrest 4 in any number of stages by engaging any one of these plurality of operator engagement portions 16 with the rotary operator 7.

[0028] In this embodiment, six operator engagement portions 16 are arranged side by side at equal intervals vertically in the central position between the left and right sides of the rear surface 6R of the support pillar, but the number of operator engagement portions 16 is not particularly limited as long as there is more than one. For example, three operator engagement portions 16 may be provided vertically at equal intervals or at unequal intervals vertically so that the headrest 4 can be adjusted to three levels: upper, middle, and lower.

[0029] The operator engagement portion 16 is formed to extend rearward from the rear surface 6R of the support pillar and includes a pair of holding frames 17 arranged opposite each other in the left-right direction. Both of the left and right holding frames 17 are formed in a generally arc shape when viewed from the rear, and are arranged on the same circumference with their concave curved surfaces facing each other.

[0030] Upper and lower ends (hereinafter referred to as "holding frame ends") 18 of the holding frame portion 17 are each connected to the upper and lower adjacent holding frame portions 17. In this way, the holding frame portions 17 are connected in a vertical direction at a predetermined interval, and form standing walls that are corrugated when viewed from the rear on the left and right sides of the center between the left and right sides of the rear surface 6R of the support pillar. In addition, a gap 18S of a predetermined width is provided between the holding frame ends 18 lined up on the left and right.

[0031] In this embodiment, of the operator engagement portions 16, the operator engagement portion (hereinafter referred to as the "upper end engagement portion") 16T arranged at the top is connected to the upper ends of the holding frame portions 17 by an upper end frame portion 19 that is generally arc-shaped when viewed from the rear and is arranged on the same circumference as the holding frame portion 17. In other words, the upper end engagement portion 16T is formed in a generally 3 / 4 arc shape by the left and right holding frame portions 17 and the upper end frame portion 19.

[0032] 3, 4, 6, and 7, the rotary operator 7 includes a substantially cylindrical operator body 20, a flange portion 21 provided annularly along the outer periphery of the front end portion 7F of the operator body 20, and a connecting frame portion 22 and a pressing element 23 that extend forward from the front end portion 7F of the operator body 20. A rib-like knob portion 24 that passes through the center of the operator body 20 and extends in the vertical direction is provided at the rear end portion 7R of the operator body 20. Furthermore, a groove portion 25 is provided on the outer periphery of the operator body 20 as an engaged portion with which an engaging element 15 provided in the operator receiving hole 14 of the holder body 8 can engage.

[0033] In this embodiment, the rotary operator 7 will be described based on the state in which the knob portion 24 is oriented vertically (extending vertically), except when describing the state in which the knob portion 24 is oriented horizontally (extending horizontally). Figure 4 is a central vertical cross-sectional view of the position adjustment mechanism 1 with the knob portion 24 oriented horizontally.

[0034] The operator body 20 is formed to have approximately the same diameter as the operator receiving hole 14 of the holder body 8, and is inserted into the operator receiving hole 14 from the front of the holder body 8, i.e., from the inner space (through hole) of the support holder 5. This allows the operator body 20 to be held rotatable 360 degrees with respect to the operator receiving hole 14 around an imaginary axis passing through the center of the circle of the operator receiving hole 14.

[0035] The flange portion 21 is formed to have a larger diameter than the operator main body 20, and when the operator main body 20 is inserted into the operator receiving hole 14 as described above, it abuts and engages with the peripheral edge of the operator receiving hole 14 from its front side (the support pillar 6 side). Furthermore, by abutting and engaging the flange portion 21 with the peripheral edge of the operator receiving hole 14 as described above, the rear end portion 7R of the operator main body 20 is held in a state where its surface is flush with the rear wall 8R of the holder main body 8.

[0036] The connecting frame portions 22 are formed to stand upright in the front-rear direction at the front end portion 7F of the operator body 20, and are arranged in pair opposite each other in the rotational diameter direction (here, the up-down direction) of the rotary operator 7. The front end portions of the connecting frame portions 22 extend to a position closely facing the support column rear surface 6R, and serve as a support frame that prevents the rotary operator 7 from slipping out forward from the operator receiving hole 14. In this way, the rotary operator 7 is rotatably held in a non-disengageable state by the support column holder 5, with the connecting frame portion 22 pressed from the front by the support column rear surface 6R, and the peripheral portion of the operator receiving hole 14 engaged with the flange portion 21 from the rear. In other words, the rotary operator 7 is sandwiched in the front-rear direction between the peripheral portion of the operator receiving hole 14 and the support column rear surface 6R, and is rotatably held in a non-disengageable state relative to the support column holder 5.

[0037] The upper and lower connecting frames 22 are both formed in a generally arc-shaped configuration when viewed from the rear, and are arranged on the same circumference with their concave curved surfaces facing each other. The outer radius of the connecting frames 22 is set to be the same as or slightly smaller than the inner radius of the holding frame 17 provided on the rear surface 6R of the support pillar. Therefore, when the operating element engaging portion 16 of the support pillar 6 is coaxial with the rotary operating element 7 and the rotary operating element 7 is rotated to a predetermined lock position (here, a position where the knob portion 24 is oriented sideways), the connecting frame 22 is engaged and held so as to overlap the inside of the holding frame 17. This allows the support pillar 6 to be supported and fixed in a predetermined position relative to the support pillar holder 5.

[0038] The left-right width of connecting frame 22 is set smaller than the left-right width of gap 18S above and below holding frame 17. Therefore, when rotary operator 7 is rotated from the locked position to a predetermined unlocked position (here, a position where knob 24 is oriented vertically), connecting frame 22 is disposed opposite gap 18S, and the engagement with holding frame 17 is released. This allows support 6 to move up and down relative to support holder 5.

[0039] As described above, the two connecting frame portions 22 face each other in the same direction as the extension direction of the knob portion 24. Since the knob portion 24 is disposed in such a manner that the user can easily recognize the locked position and the unlocked position of the rotary operator 7 from the orientation of the knob portion 24.

[0040] When the rotary operator 7 is rotated to the unlock position at the upper end engagement part 16T, the upper-positioned connecting frame part 22 is engaged and held so as to overlap the underside of the upper end frame part 19 of the upper end engagement part 16T. This prevents the support column 6 from moving downward. In other words, the upper end frame part 19 of the upper end engagement part 16T acts as a stopper that prevents the support column 6 from sliding downward. Note that the upper end frame part 19 does not necessarily have to be provided as long as a stopper mechanism that can prevent the support column 6 from moving downward beyond a predetermined position is provided elsewhere on the support column 6 or support column holder 5.

[0041] A middle plate 26 that connects the insides of the upper and lower connecting frame portions 22 is provided between the centers of the front end portions 7F of the connecting frame portions 22. The middle plate portion 26 extends in the vertical direction through the circular center of the operating device main body 20. As a result, when the rotary operating device 7 is in the locked position, even if a pressing force is applied in the vertical or horizontal direction to the engagement portion between the holding frame portion 17 and the connecting frame portion 22, the connecting frame portion 22 will not easily bend toward the circular center of the operating device main body 20.

[0042] In this embodiment, the middle plate portion 26 is extended in the vertical direction so as to connect the central portions between the left and right sides of the upper and lower connecting frame portions 22, but the middle plate portion 26 may also be extended in the vertical direction so as to connect the left end portions and right end portions of the upper and lower connecting frame portions 22.

[0043] The pressing elements 23 are formed to rise forward from the front end 7F of the operator body 20 and are arranged in pair facing each other in the radial direction of rotation (here, the left-right direction) of the rotary operator 7, with a middle plate 26 sandwiched between them. The pressing elements 23 are cantilevered plate pieces whose base ends are connected to the front end 7F and whose tips have protrusions 27. When the support column 6 is moved up and down, the protrusions 27 come into contact with the holding frame end 18, causing the pressing elements 23 to elastically deform toward the center between the left and right sides of the rotary operator 7. That is, when the connecting frame 22 moves up and down through the gap 18S, the pressing elements 23 elastically press against the holding frame end 18 (the inner wall of the gap 18S), providing resistance when the support column 6 is moved up and down. Therefore, even when the rotary operator 7 is rotated to the unlocked position, the support column 6 will not move up and down unless a force greater than a certain level is applied in the vertical direction.

[0044] The protrusions 27 are formed into arcuate curved surfaces that curve outward from the upper and lower edges of the pusher 23. The distance between the tops of the protrusions 27 on the left and right pusher 23 is set to be greater than the distance between the adjacent retaining frame ends 18, i.e., the left-right width of the gap 18S. Therefore, when the support 6 is moved up and down, the retaining frame ends 18 slide along the arcuate curved surfaces of the protrusions 27, gently pushing and bending the pusher 23 toward the center of the rotary operator 7.

[0045] The groove 25 has a generally semicircular cross section and extends from the inner periphery of the flange 21 to the rear end 7R of the operator body 20. The grooves 25 are provided at four locations, top, bottom, left, and right, on the outer periphery of the operator body 20. Therefore, when the rotary operator 7 is in the unlocked position, the engaging elements 15 provided at two upper and lower locations on the inner periphery of the operator receiving hole 14 engage with the two upper and lower grooves 25 on the operator body 20. When the rotary operator 7 is rotated in one direction from this state, the engaging elements 15 are pressed against the outer periphery of the operator body 20 and are released from engagement with the grooves 25. When the rotary operator 7 is rotated to the locked position, the engaging elements 15 engage with the two left and right grooves 25 on the operator body 20. This allows the user to clearly recognize the locked position and the unlocked position of the rotary operator 7 by the vibration (click feeling) felt when the engaging piece 15 engages with the groove 25.

[0046] In this embodiment, the engaging elements 15 are provided at two opposing positions, one above the other, on the inner periphery of the operator receiving hole 14, while the grooves 25 are provided at four positions, one above the other, on the left and right of the operator body 20. There is no particular limitation on the number of engagement pieces 15 and grooves 25. For example, to enable the user to properly recognize at least the locked position of the rotary operator 7, the engagement piece 15 may be provided in only one location below the inner periphery of the operator receiving hole 14, while the grooves 25 may be provided in two locations on the left and right sides of the operator body 20.

[0047] As described above, the position adjustment mechanism 1 of this embodiment is a position adjustment mechanism for the seat body 3 and the support post 6, and is equipped with a support post holder (holder member) 5 fixed to the seat body (mounting object) 3 of the child bicycle seat 2, a support post (movable member) 6 that is held so that it can slide relative to the seat body 3 via the support post holder 5, and a rotary operator 7 that engages with the support post 6 at a predetermined rotational position and can prevent the support post 6 from sliding.The support post holder 5 has an operator receiving hole 14 that rotatably holds the rotary operator 7, and the rotary operator 7 is clamped between the peripheral portion of the operator receiving hole 14 and the support post 6, so that it is rotatably held in a non-detachable state relative to the support post holder 5, and the support posts 6 are arranged in multiple rows in the sliding direction and have an operator engagement portion 16 that engages with the rotary operator 7 when the rotary operator 7 is rotated to a predetermined lock position and disengages from the rotary operator 7 when the rotary operator 7 is rotated to a predetermined unlock position.

[0048] The rotary operator 7 also has a pressing element 23 that can be elastically pressed into contact with the operator engaging portion 16 when the support post 6 is slid.

[0049] Furthermore, the sliding direction of the support 6 is defined as the up-down direction, the extension direction of a virtual axis perpendicular to the sliding direction and passing through the center of rotation of the rotary operator 7 as the front-rear direction, and the direction perpendicular to each of the sliding direction and extension direction as the left-right direction; the operator engagement portion 16 is formed upright on the rear surface 6R of the support (the surface of the support 6 facing the rotary operator 7) and has a pair of holding frame portions 17 arranged opposite each other in the left-right direction; the rotary operator 7 has a pair of connecting frame portions 22 extended in the front-rear direction and arranged opposite each other in the rotational diameter direction; when the rotary operator 7 is in the locked position, the connecting frame portions 22 overlap the holding frame portions 17, thereby engaging the operator engagement portion 16 with the rotary operator 7; and when the rotary operator 7 is in the unlocked position, the overlap between the connecting frame portions 22 and the holding frame portions 17 is released, thereby disengaging the operator engagement portion 16 from the rotary operator 7.

[0050] In addition, either the support holder 5 or the rotary operator 7 (here, the support holder 5) has an engaging element 15 that can elastically engage with an engaging portion (groove portion 25) provided on the other of the support holder 5 or the rotary operator 7 (here, the rotary operator 7) when the rotary operator 7 is rotated to the locked position and when it is rotated to the unlocked position.

[0051] The position adjustment mechanism 1 described above can reduce the number of parts and simplify the overall structure compared to mechanisms configured to clamp the support post 6 using an operating knob, nut, plate, etc. Moreover, with this mechanism, the support post 6 can be slid or restricted by simply rotating the rotary operating element 7 to the locked position or the unlocked position, thereby improving operability.

[0052] Furthermore, in a mechanism configured to clamp and fix the support post 6 with an operating knob and a nut, as in the conventional position adjustment mechanism described above, there is a risk that the support post 6 may move unintentionally if the nut loosens due to vibrations while riding the bicycle or bending of the components. However, with the position adjustment mechanism 1 described above, the rotary operator 7 is clamped between the periphery of the operator receiving hole 14 and the support post 6, so that it is rotatably held in a locked state relative to the support post holder 5, and is therefore less susceptible to the effects of vibrations, etc. Furthermore, with this mechanism, when the support post 6 slides, the pressing member 23 elastically presses against the operator engaging portion 16, providing resistance, so that even if the engagement between the rotary operator 7 and the support post 6 is released for some reason, the support post 6 will not slide unintentionally. Furthermore, when the rotary operator 7 is locked, the support post 6 can be prevented from moving significantly from the appropriate fixed position, further improving operability.

[0053] Furthermore, with this device, when the rotary operator 7 is rotated to the locked or unlocked position, the engaging element 15 engages with the groove portion 25 of the rotary operator 7, allowing the user to clearly recognize the rotational position of the rotary operator 7, further improving operability.

[0054] In the above embodiment, the support holder 5 is described as being provided with an engaging element 15 that can elastically engage with the groove portion 25 provided in the rotary operator 7 when the rotary operator 7 is rotated to the locked position and when the rotary operator 7 is rotated to the unlocked position, but the rotary operator 7 may also be provided with an engaging element that can elastically engage with the engaged portion provided in the support holder 5 when the rotary operator 7 is rotated to the locked position and when the rotary operator 7 is rotated to the unlocked position.

[0055] Furthermore, the position adjustment mechanism 1 in the above embodiment has been described as adjusting the height position of the headrest 4 of the child bicycle seat 2, but as long as it can adjust the relative positions of the two components, there are no particular limitations on the target and direction of application of the position adjustment mechanism 1. [Explanation of symbols]

[0056] 1 Position adjustment mechanism 3 Seat body (installation target) 5 Support holder (holder component) 6 Support (movable part) 7 Rotation control 14 Operator receiving hole 15 Engagement element 16. Operator engagement portion 17 Holding frame 22 Connecting frame section 23 Pressing joint 25 Groove (engaged part)

Claims

1. a holder member fixed to an attachment object; a movable member that is slidably held relative to the attachment target via the holder member; a rotation operator that is engaged with the movable member at a predetermined rotation position and can prevent the movable member from sliding, The sliding direction of the movable member is defined as a vertical direction, the extension direction of a virtual axis that is perpendicular to the sliding direction and passes through the rotation center of the rotary operator is defined as a front-rear direction, and the directions that are perpendicular to both the sliding direction and the extension direction are defined as left-right directions, the holder member has an operator receiving hole that rotatably holds the rotary operator, The rotary operator has an operator body, a flange portion annularly provided along the outer periphery of the operator body, and a pair of connecting frame portions extending in the front-rear direction at a front end of the operator body and arranged opposite to each other in a rotational diameter direction, and is rotatably held relative to the holder member in a non-dislodging state by inserting the operator body into the operator receiving hole and abutting and engaging the flange portion against a peripheral edge portion of the operator receiving hole from the movable member side, and by being sandwiched between the peripheral edge portion and the movable member from the front-rear direction, The movable member is a position adjustment mechanism having a plurality of movable members arranged side by side in the vertical direction, and an operator engagement portion that engages with the connecting frame portion when the rotary operator is rotated to a predetermined lock position, and that disengages from the connecting frame portion when the rotary operator is rotated to a predetermined unlock position.

2. 2. The position adjustment mechanism according to claim 1, wherein the rotary operator has a pressing element that can be elastically pressed against the operator engaging portion when the operator engaging portion is in the disengaged state and the movable member is slid in the up and down direction.

3. A position adjustment mechanism as described in claim 1 or 2, wherein the operator engagement portion has a pair of holding frame portions that are formed upright on the surface of the movable member facing the rotary operator and that are arranged opposite each other in the left-right direction, and when the rotary operator is in the locked position, the connecting frame portions overlap the holding frame portions to achieve the engaged state, and when the rotary operator is in the unlocked position, the overlap between the connecting frame portions and the holding frame portions is released to achieve the disengaged state.

4. A position adjustment mechanism as described in any one of claims 1 to 3, wherein either the holder member or the rotary operator has an engaging element that can elastically engage with an engaging portion provided on the other of the holder member or the rotary operator when the rotary operator is rotated to the locked position and when the rotary operator is rotated to the unlocked position.

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