JP2010269780A - Bicycle child seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a bicycle mounted with a bicycle child seat while avoiding easy wobble thereof by applying reclining adjustment to reduce the longitudinal fluctuation of the gravity center of the bicycle child seat on which a child sits without giving great rocking to the upper side of a backrest body. <P>SOLUTION: The bicycle child seat includes a seat body 2 having a seat 1 and the backrest body 4 having a backrest 3, separately, the backrest body 4 having a bottom wall 16 protruded forward from the lower end of the backrest 3, the backrest body 4 being supported at its upper side on the seat body 2 rockingly around a supporting shaft 20 in the longitudinal direction, the seat 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 being overlapped with each other movably forward/backward, and a backrest engaging mechanism 23 for holding the bottom wall 16 of the backrest body 4 in engagement with the seat 1 of the seat body 2 movably and adjustably forward/backward around the supporting shaft 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an infant seat for bicycles.

The infant seat for bicycles is provided with a seat body having a seat portion and a backrest body having a backrest portion separately so that the backrest body can be swung and adjusted with respect to the seat body. There is one that can be reclined (for example, Patent Document 1).
In this type of conventional infant seat for bicycles, the lower side of the backrest is supported so as to be swingable around a support shaft in the left-right direction with respect to the seat body, and the upper side of the backrest body is moved back and forth on the upper side of the seat body. An engagement mechanism for engaging and holding in an adjustable manner was provided (for example, Patent Document 1).

Japanese Patent No. 4176939

Therefore, conventionally, the reclining adjustment causes the upper side of the backrest to swing largely back and forth around the lower side as a fulcrum, which increases the back-and-forth variation of the center of gravity of the infant seat for bicycles, and the infant seat for bicycles is installed. There was a problem that the bicycle was unstable and unstable.
In view of the above-described problems, the reclining adjustment prevents the upper side of the backrest body from swinging greatly, and the variation in the center of gravity of the infant seat for the bicycle on which the infant is seated is reduced. The bicycle is designed to be stable and difficult to wobble.

  The technical means of the present invention for solving this technical problem comprises a seat body having a seat part and a backrest body having a backrest part separately, and a bottom projecting forward from the lower end of the backrest part to the backrest body. A wall is provided, and the upper side of the backrest body is supported so as to be swingable around a support shaft in the left-right direction with respect to the seat body, and the seat portion of the seat body and the bottom wall of the backrest body are superposed so as to be movable back and forth. The backrest engagement mechanism is provided for engaging and holding the bottom wall of the backrest body with respect to the seat portion of the seat body so as to be movable back and forth around the support shaft.

According to another technical means of the present invention, a backrest lock mechanism for locking the backrest engagement mechanism in an engaged state is provided, and the backrest lock mechanism is switched between a locked state and an unlocked state with one hand. It is configured to be operable.
According to another technical means of the present invention, the backrest engagement mechanism includes a plurality of fitting recesses or fitting protrusions provided side by side in the front-rear direction on one overlapping surface of the seat or the bottom wall. A rocking member whose middle part in the front-rear direction can be swung around the horizontal axis on the other of the seat part or the bottom wall, and projecting on one end side in the front-rear direction of the rocking member, It has the point which has the fitting convex part or fitting recessed part which moves to the fitting recessed part or fitting convex part by moving the other end side of a direction to an up-down direction.

According to another technical means of the present invention, the backrest locking mechanism includes a lock piece that is held movably back and forth on the other end in the front-rear direction of the swinging member, and a downward projecting projection on the seat or the bottom wall. And a stopper piece
The locking piece comes into contact with the stopper piece from below and locks the fitting convex portion or fitting concave portion into the fitting concave portion or fitting convex portion. The portion or the fitting recess is movably held at a lock release position that allows the portion or the fitting recess to move out of the fitting recess or the fitting projection.

According to another technical means of the present invention, the lock piece is biased toward the lock position by the lock spring member, and the lock piece is moved toward the lock release position against the bias of the lock spring member. In this case, the lock piece is pressed against the side wall surface of the stopper piece by the urging force of the lock spring member, and the lock piece is held on the lock release position side.
Further, according to another technical means of the present invention, an engagement spring member that biases the swing member in a direction in which the fitting convex portion or the fitting concave portion moves toward the fitting concave portion or the fitting convex portion is provided. There is in point.

According to another technical means of the present invention, there is provided a backrest operating tool for operating the backrest engagement mechanism between the engaged state and the disengaged state, and the backrest engagement mechanism is engaged. And a positioning mechanism for positioning in the disengaged state.
According to another technical means of the present invention, a backrest operating tool for operating the backrest engaging mechanism is provided, and a backrest locking mechanism for locking the backrest engaging mechanism in the engaged state is provided. The switching operation tool for switching the backrest locking mechanism between the locked state and the unlocked state is also used as the backrest operating tool.

According to another technical means of the present invention, the seat body has a pair of left and right body side walls in addition to the seat portion, and the backrest body is a pair of left and right backrests in addition to the backrest portion and the bottom wall. A pair of left and right main body side walls of the seat body and a pair of left and right backrest side walls of the backrest body are overlapped on the left and right, and the pair of left and right backrest side walls are swingable around the support shaft on the main body side walls. It is in the point supported.
Another technical means of the present invention is that the seat portion of the seat body and the bottom wall of the backrest body are superposed so as to be movable back and forth with respect to each other on an arcuate curved surface with the support shaft as a fulcrum. The backrest engagement mechanism includes a plurality of fitting recesses provided on one overlapping surface of the seat or the bottom wall in a circular arc direction around the support shaft, and a fitting recess on the other of the seat or the bottom wall. A fitting convex portion that is held so as to be movable back and forth, and the fitting convex portion selectively engages the plurality of fitting concave portions to engage the bottom wall with the seat portion so that the front and rear movements can be adjusted. It is comprised so that it may fit, and the said backrest locking mechanism exists in the point comprised so that a fitting convex part may be locked in the state fitted to the fitting recessed part.

  According to another technical means of the present invention, a storage portion is provided on the other of the seat portion or the bottom wall corresponding to the fitting recess, and the support block is movable up and down toward the fitting recess in the storage portion. And the fitting projection protrudes from the storage portion to the fitting recess as the support block moves up and down, and biases the support block toward the fitting recess. The backrest locking mechanism is provided with a locking recess provided so as to communicate with the fitting recess of the storage portion, and the backrest operating tool can be rotated between the lock position and the lock release position. The locking projection engages with the locking recess when the locking member is rotated to the locked position with the backrest operating tool, and the fitting projection engages with the fitting recess. The support block is locked so that it cannot move. When the lock member is rotated to the unlocking position, the support block can be moved and the fitting convex portion can be retracted from the fitting concave portion into the storage portion by detaching from the locking concave portion. is there.

  According to another technical means of the present invention, the backrest operating tool is disposed on a lower surface side of the support block, and the support block is vertically sandwiched between the backrest operating tool and the lock member, The lock member is connected to the support block so as to rotate about the vertical axis. By rotating the backrest operating tool about the vertical axis, the lock member rotates about the vertical axis in conjunction with the backrest operating tool. Then, the support block moves the storage portion by moving the backrest operating tool while the lock member is rotated to the unlock position, and the fitting block is fitted. It is in the point comprised so that it may remove | deviate from a joint recessed part.

  According to another technical means of the present invention, the seat portion of the seat body and the bottom wall of the backrest body are superposed so as to be movable back and forth with respect to each other on an arcuate curved surface having a support shaft as a fulcrum. The slewing engagement mechanism includes a plurality of locking gears arranged side by side in the arc direction around the support shaft on one overlapping surface of the seat wall of the seat body or the bottom wall of the backrest body, and the seat stool or back of the seat body. There is an engaging claw provided on the other bottom wall of the drooping body so that it can be moved back and forth toward the locking gear, and the engaging claw engages the backrest bottom wall with the seat part so that it can be adjusted forward and backward. The backrest lock mechanism is configured to lock the engagement claw in a state of being engaged with the engagement gear.

  Another technical means of the present invention is that the backrest body is supported so as to be swingable around the support shaft together with the support shaft so as to be vertically movable, and the backrest bottom wall is a seat portion of the seat body. It is in the point that it is superposed so that it can move back and forth.

  According to the present invention, the upper side of the backrest body is supported so as to be swingable around a support shaft in the left-right direction with respect to the seat body, and the bottom wall of the backrest body is rotated around the support shaft with respect to the seat portion of the seat body. The backrest engagement mechanism that engages and holds the head is adjustable so that the upper side of the backrest body does not swing back and forth greatly by the reclining adjustment. Fluctuation of the front and rear is reduced, and the bicycle with the infant seat for bicycles is less likely to wobble and stable.

It is a side view of the infant seat for bicycles showing one embodiment of the present invention. It is a top view of the infant seat for the bicycle. It is a disassembled perspective view of the infant seat for bicycles. It is side surface sectional drawing of the infant seat for the bicycle. It is a side view of the seat main body. It is a top view of the seat body. It is a top view of the same back body. It is a bottom view of the same back body. It is a front view of the headrest. It is front sectional drawing of the handle | steering-wheel part. It is a side view of the support part of the handle. It is the sectional view on the AA line of the same FIG. It is a disassembled perspective view of the belt winder. It is front sectional drawing of the rotation lock state of the belt winder. It is front sectional drawing of the ratchet cancellation | release state of the same belt winder. It is side surface sectional drawing of the backrest engagement mechanism (backrest lock mechanism) part. It is front sectional drawing of the engagement state of the backrest engagement mechanism part. It is front sectional drawing of the engagement cancellation | release state of the backrest engagement mechanism part. It is a disassembled perspective view of the backrest engagement mechanism part. It is a disassembled perspective view of the backrest engagement mechanism part which shows other embodiment. It is a perspective view of the infant seat for bicycles. It is a disassembled perspective view of the backrest engagement mechanism part which shows other embodiment. It is a disassembled perspective view of the backrest engagement mechanism part which shows other embodiment. It is a perspective view of the infant seat for bicycles. It is a disassembled perspective view of the backrest engagement mechanism part which shows other embodiment. It is a perspective view of the infant seat for bicycles. It is a side view of the infant seat for bicycles showing other embodiments. It is a perspective view of the backrest engagement mechanism part. It is side surface sectional drawing of the backrest engagement mechanism part. It is a disassembled perspective view of the backrest engagement mechanism part. It is side surface sectional drawing of the backrest engagement mechanism part for the same operation | movement description. It is side surface sectional drawing of the other backrest engagement mechanism part for same operation | movement description. It is a disassembled perspective view of the backrest engagement mechanism part different from this invention. It is a side view of the infant seat for bicycles. It is a disassembled perspective view of the backrest engagement mechanism part different from this invention. It is a perspective view of the infant seat for bicycles.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4, the child seat for a bicycle includes a seat body 2 having a seat portion 1 and a backrest body 4 having a backrest portion 3, and the backrest portion 3 of the backrest body 4 is provided separately. A headrest 5 is provided so as to be adjustable in height, and a step 6 is provided on the seat body 2 so as to be swingable about a horizontal axis 7. The bicycle child seat is detachably attached to the handlebar 8 of the bicycle, and is configured so that an infant can be seated thereon and can be used as a luggage. As shown in FIG. 4, the step 6 can be changed to a closed posture P where the front of the seat portion 1 of the seat body 2 is closed from the bottom, and a foot placement posture S where a foot lowered when the legs are lowered can be placed. It has become.

The seat body 2, the backrest 4, the headrest 5, and the step 6 are each integrally formed of synthetic resin.
As shown in FIGS. 1 to 6, the seat body 2 has a pair of left and right body side walls 11 in addition to the seat portion 1, and the pair of left and right body side walls 11 of the seat body 2 is a pair of left and right handlebars 8 of the bicycle. Is fixed by a fastener such as a bolt and nut (not shown). A foot opening 12 is provided in front of the seat 1, and a partition wall 13 that protrudes forward from the center in the left-right direction of the seat 1 and separates the foot opening 12 left and right is provided. A connecting wall plate 14 that connects the front ends of the pair of left and right main body side walls 11 is provided, and the front end side of the partition wall 13 is connected to the central portion in the left-right direction of the connecting wall plate 14.

As shown in FIGS. 1 to 4, 7, and 8, the backrest 4 includes a bottom wall 16 that protrudes forward from the lower end of the backrest 3 in addition to the backrest 3, and a pair of left and right backrest sidewalls 17. have.
As shown in FIGS. 1 to 4, a pair of left and right backrest side walls 17 of the backrest body 4 are disposed inside a pair of left and right main body side walls 11 of the seat body 2, and a pair of left and right main body side walls 11 of the seat body 2 are disposed. The rear part and the front part of the pair of left and right backrest side walls 17 of the backrest body 4 are overlapped to the left and right. For example, the attachment hole 10 of the main body side wall 11 is closed from the outside by the disk body 15 and the front upper part of the side wall 17 By tightening the side and the rear upper side of the main body side wall 11 with a bolt (not shown) and a nut held by the disc body 15, the front upper side of the pair of left and right backrest side walls 17 Is supported so as to be swingable about a direction support shaft 20. Thus, the upper side of the backrest 4 is supported so as to be swingable around the support shaft 20 in the left-right direction with respect to the seat body 2, and the bicycle is composed of a pair of left and right main body side walls 11 and a pair of left and right backrest side walls 17. A pair of left and right seat side walls 21 of the child seat is formed.

As shown in FIGS. 1 to 4 and FIGS. 16 to 19, the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest 4 are curved in an arc shape with a support shaft 20 as a fulcrum. The bottom wall 16 of the backrest body 4 is arranged on the seat portion 1 of the seat, and the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are curved in an arc shape with the support shaft 20 as a fulcrum. Polymerized so that they can move forward and backward with respect to each other.
A backrest engagement mechanism 23 that engages and holds the bottom wall 16 of the backrest body 4 with respect to the seat portion 1 of the seat body 2 around the support shaft 20 so as to be movable back and forth is adjustable between the seat portion 1 and the bottom wall 16. A backrest locking mechanism 24 for locking the backrest engaging mechanism 23 in the engaged state, and a backrest operating tool 25 for operating the backrest engaging mechanism 23 is provided on the lower surface side of the seat portion 1. Is provided.

  As shown in FIGS. 4, 6, and 16 to 19, the backrest engagement mechanism 23 includes a plurality of fitting recesses 27 provided on the bottom wall 16 and a fitting protrusion 28 provided on the seat portion 1. The plurality of fitting recesses 27 are provided on the lower surface (overlapping surface) of the bottom wall 16 side by side in the arc direction around the support shaft 20, and the fitting projections 28 are directed to the seat portion 1 toward the fitting recesses 27. The fitting convex portion 28 is configured to be selectively fitted to a plurality of fitting concave portions 27 so as to engage the bottom wall 16 with respect to the seat portion 1 so as to be movable in the front-rear direction. ing.

  A storage portion 29 that opens up and down corresponding to the fitting recess 27 is provided at the rear end of the seat portion 1. A connecting bottom wall 30 that connects the front and rear of the lower opening edge is provided at the center in the left-right direction of the storage portion 29, and an attachment hole 31 is formed in the connecting bottom wall 30. A pair of left and right support blocks 32 are held on the left and right sides of the storage portion 29 so as to be movable up and down toward the fitting recess 27. The pair of left and right support blocks 32 are connected to each other by a connecting wall portion 33 in the middle in the vertical direction. A mounting hole 34 is formed in the connecting wall portion 33.

  The pair of left and right support blocks 32 are provided with fitting projections 28, and the fitting projections 28 are moved from the storage portion 29 to the fitting depressions 27 as the support block 32 moves up and down. A biasing member 35 that biases the support block 32 toward the fitting recess 27 is provided. The urging member 35 is constituted by a coil spring and is disposed between the connection bottom wall 30 and the connection wall portion 33. The urging member 35 may be constituted by a leaf spring, an elastic body, or the like instead of the coil spring.

  The backrest lock mechanism 24 includes a pair of front and rear locking recesses 37 provided at the front end of the seat portion 1, and a lock member 38 that can be rotated to the lock position X1 and the unlock position Y1 by the backrest operation tool 25. The pair of front and rear locking recesses 37 are formed on the side of the fitting recess 27 at the center in the left-right direction of the storage portion 29 so as to communicate with the storage portion 29. When the lock member 38 is rotated to the lock position X1 by the backrest operating tool 25, both ends of the lock member 38 are engaged with the engagement recess 37, so that the fitting projection 28 is fitted into the fitting recess 27. In the joined state, the support block 32 is locked so as not to move downward, whereby the backrest locking mechanism 24 is configured to lock the fitting convex portion 28 in a state of fitting into the fitting concave portion 27. Further, when the lock member 38 is rotated to the unlock position Y1 by the backrest operating tool 25, the lock member 38 is detached from the engaging recess 37, so that the support block 32 can be moved up and down, and the fitting protrusion 28 can be retracted from the fitting recess 27 into the storage portion 29. Therefore, the backrest operation tool 25 functions as a switching operation tool for switching the backrest lock mechanism 24 between the locked state and the unlocked state (also used as a switching operation tool).

  A support cylinder shaft 40 is projected from the lock member 38, and a cross washer 43 is fitted and fixed to the protruding end side of the support cylinder shaft 40 so as not to be relatively rotatable. The support cylinder shaft 40 is connected to the connection wall portion 33 and the connection bottom wall 30. Are inserted through the mounting holes 31 and 34 so as to be relatively rotatable about the vertical axis. The backrest operating tool 25 is disposed on the lower surface side of the support block 32, and the cross washer 43 is fitted and fixed to the fitting recess 44 of the backrest operating tool 25, and the backrest operating tool 25 and the lock member 38 are connected to the bolt and nut. The support block 32 is clamped up and down by the backrest operating tool 25 and the lock member 38, and the backrest operating tool 25 and the lock member 38 are attached to the support block 32 by being fastened and fixed by the fastener 41 such as the above. They are connected to each other so as to rotate around the vertical axis. Therefore, when the backrest operating tool 25 is rotated about the vertical axis, the lock member 38 is rotated about the vertical axis to the lock position X1 and the unlock position Y1 in conjunction with the backrest operating tool 25, and the lock member is rotated. When the backrest operating tool 25 is pulled in the vertical axis direction (downward) with the 38 rotated to the unlocking position Y1, the support block 32 moves down the storage portion 29 and the fitting convex portion 28 is fitted. It is configured to be removed from the recess 27. Therefore, the backrest operating tool 25 is also used as a switching operation tool for switching the backrest locking mechanism 24 between the locked state and the unlocked state. The backrest operating tool 25 is used as the backrest engaging mechanism 23. It functions as an operating tool for releasing the engagement of the backrest and functions as a switching operating tool for the backrest lock mechanism 24.

  As shown in FIGS. 6, 8, 17, and 18, a pair of left and right guide grooves 46 are provided on the left and right sides of the rear portion of the seat portion 1, and correspond to the guide grooves 46 on the left and right sides of the bottom wall 16. A pair of left and right fitting protrusions 47 project downward, and the fitting protrusion 47 is fitted in the guide groove 46 so as to be slidable back and forth, so that the backrest 4 is not rattled to the left and right with respect to the seat body 2. It is guided so that it can move back and forth.

  As shown in FIGS. 4, 6, 9, and 13 to 15, a belt winder 52 is provided on the front side of the seat portion 1 to wind up two seat belts 51 so as to be unwound. A pair of connecting belts 53 are connected to the left and right sides of the headrest 5 which is the upper part on the backrest 3 side. As shown in FIG. 9, an upper insertion hole 48 and a lower insertion hole 49 are provided on both the left and right sides of the headrest 5, and a connection belt 53 is inserted through these insertion holes 48, 49, so that a base end portion of the connection belt 53 is provided. The connection belt 53 is connected to both the left and right sides of the headrest 5 by forming the retaining portions 50 that cannot be inserted into the insertion holes 48 and 49.

  A male member 54 and a female member 55 that are detachably connected to each other at one end with a single touch are provided at the front end portion of the two seat belts 51 and the front end portion of the pair of left and right connecting belts 53. 51 and the pair of left and right connecting belts 53 are connected via a male member 54 and a female member 55. The partition wall 13 is provided with a storage recess 56 that is recessed downward, and the belt winder 52 is detachably stored and held in the storage recess 56.

  As shown in FIGS. 13 to 15, the belt winder 52 includes a winding case 58 and a winding rotary body 59 that winds up two seat belts 51, and the winding case 58 includes a pair of left and right windings. The case bodies 58a and 58b are fastened to each other by a fastener 60 such as a bolt and nut. The winding rotator 59 is a combination of a pair of left and right rotators 59a and 59b, and is housed in the winding case 58 so as to be rotatable about a horizontal axis (axial center of the fastener 60). The take-up rotator 59 is urged so as to be rotatable in the direction of taking up the seat belt 51 by the retracted take-up spring 62.

In the winding case 58, a ratchet mechanism 65 and a rotation lock mechanism 66 that disables the rotation of the winding rotary body 59 are provided, and a ratchet operating tool 67 is provided outside the winding case 58.
The ratchet mechanism 65 has a pair of left and right ratchet gears 68 provided on the winding rotary body 59 and a pair of right and left ratchet claws 69 detachably engaged with the ratchet gear 68. A ratchet member 70 having a pair of right and left ratchet claws 69 is held movably toward the ratchet gear 68, and the ratchet member 70 is urged toward the ratchet gear 68 in the winding case 58. A spring 71 is provided, and the ratchet mechanism 65 is configured to allow only the rotation of the winding rotary body 59 in the feeding direction and disable the rotation in the winding direction.

  The rotation lock mechanism 66 includes a locking portion 73 provided in the winding case 58, and a lock member 74 that can be rotated to a lock position X2 and a lock release position Y2. A first support cylinder 77 and a second support cylinder 78 project vertically from the center of the lock member 74. The first support cylinder 77 includes a base-side cylindrical portion 77a and a distal-end-side square tube portion 77b. Have. The second support cylinder 78 is formed in a cylindrical shape. The first support cylinder 77 is inserted into the upper wall of the winding case 58 via an insertion hole 80 so as to be rotatable about the axis, and is fitted and fixed to the lower surface side of the ratchet operating tool 67. The second support cylinder 78 is inserted into the central portion of the claw component 70 so as to be relatively rotatable about the axis. The ratchet operating tool 67 is disposed on the outer surface side of the winding case 58, and the ratchet operating tool 67 and the lock member 74 are connected to each other by a fastener 81 such as a bolt and nut inserted into the first support cylinder 77 and the second support cylinder 78. The lock member 74 is fixed and connected to the claw component 70 so as to be rotatable around the support cylinders 77 and 78, and the ratchet operating tool 67 is rotated around the support cylinders 77 and 78 (support shafts). Is rotated around the support cylinders 77 and 78 to the lock position X2 and the lock release position Y2 in conjunction with the ratchet operating tool 67.

  When the lock member 74 is rotated to the lock position X2 by the ratchet operating tool 67, the lock member 74 is engaged with the engaging portion 73, whereby the ratchet claw 69 is engaged with the ratchet gear 68. The member 70 is locked to the ratchet gear 68 side, so that the rotation lock mechanism 66 locks the ratchet pawl 69 in a state of being engaged with the ratchet gear 68, thereby disabling the rotation of the winding rotary member 59. Further, when the lock member 74 is rotated to the unlock position Y2 by the ratchet operating tool 67, the lock member 74 is detached from the engaging portion 73, so that the ratchet claw 69 is detached from the ratchet gear 68. 70 can be retracted from the ratchet gear 68 side, and the lock by the rotation lock mechanism 66 can be released. Accordingly, the ratchet operating tool 67 has a function as a ratchet operating tool for separating the ratchet pawl 69 from the ratchet gear 68, and switching for switching the rotation lock mechanism 66 between the locked state and the unlocked state. Has the function of an operation tool.

  By pulling (moving) the ratchet operating tool 67 in the direction of the support cylinders 77 and 78 (support shaft) in a state where the lock member 74 is rotated to the unlock position Y2, the pawl is resisted against the bias of the ratchet spring 71. The component member 70 is separated from the ratchet gear 68 together with the lock member 74 so that the ratchet pawl 69 is detached from the ratchet gear 68. Thus, the ratchet pawl 69 is separated from the ratchet gear 68 for winding. The rotating body 59 is automatically rotated in the winding direction by the urging force of the winding spring 62.

  As shown in FIGS. 1, 3, 5, and 10 to 12, a handle 85 is provided between the pair of left and right seat side walls 21 (main body side wall 11). A pair of upper and lower sandwiching rails 86 are provided in the front-rear direction on the pair of left and right seat side walls 21, and fitting bodies 87 are provided at both left and right ends of the handle 85 so as to be fitted between the pair of sandwiching rails 86 so as to be movable forward and backward. It has been. A pair of left and right body side walls 11 are provided with long insertion holes 88 in the front-rear direction, and support cylinders 89 project outwardly in the left-right direction at both ends of the handle 85, and the support cylinders 89 are inserted through the pair of seat side walls 21. The hole 88 is inserted so as to be movable back and forth.

  As shown in FIGS. 10 to 12, the fitting body 87 is formed in a disc shape and is disposed on the outer surface side of the pair of main body side walls 11 (seat side walls 21), and a support shaft 90 is provided at the center of the fitting body 87. Projecting inward in the left-right direction, the support shafts 90 are inserted into the support cylinders 89 so as to be rotatable around the shaft center, so that the fitting bodies 87 are placed on both ends of the handle 85 on the horizontal axes (support shafts 90). A fixed position A and a fixed release position B are rotatably connected around. An arc-shaped elongated hole 92 is provided at a position corresponding to the radial direction of the fitting body 87, thereby forming a deformable portion 93 that can be elastically deformed radially inward at an outer peripheral portion corresponding to the radial direction of the fitting body 87. Has been.

  The pair of upper and lower sandwiching rails 86 are disposed on the outer surface side of the pair of body side walls 11 and above and below the insertion hole 88, and both ends of the pair of upper and lower sandwiching rails 86 are mutually outside in the front-rear direction of the insertion hole 88. It is connected. The pair of upper and lower clamping rails 86 are formed in a waveform so as to repeat separation and approaching in the front-rear direction, and when the fitting body 87 is rotated to the fixed position A, the deformed portion 93 of the fitting body 87 is paired. The deformed portion 93 of the fitting body 87 corresponds to the pair of sandwiching rails 86 when the fitting body 87 is fixed to the pair of sandwiching rails 86 so as to be unable to move back and forth. Thus, the fitting body 87 is fitted and held between the pair of holding rails 86 so as to be movable back and forth.

A rotation operation body 94 for rotating the fitting body 87 about the horizontal axis is fixed to the inner end portion of the support shaft 90 by fastening with a fastener 91 such as a bolt and nut, and the rotation operation body 94 is a pair. Is disposed on the inner surface side of the main body side wall 11. A protective cover 95 that covers the outer sides of the pair of sandwiching rails 86 and the fitting body 87 is detachably provided on the outer surface of the body side wall 11 of the seat body 2.
According to the above embodiment, as shown in FIGS. 16 and 17, the backrest portion 3 is moved from the state in which the lock member 38 is in the lock position X1 and the fitting convex portion 28 is fitted in the fitting concave portion 27. When the reclining adjustment is performed, first, as shown in FIG. 18, the backrest operation tool 25 is rotated to rotate the lock member 38 from the lock position X1 to the lock release position Y1. Then, when the lock member 38 is removed from the locking recess 37, the support block 32 can be moved up and down, and the fitting projection 28 can be retracted from the fitting recess 27 into the storage portion 29. Thereafter, as shown in FIG. 18, by pulling the backrest operating tool 25 in the vertical axis direction (downward), the support block 32 moves down the storage portion 29, and the fitting convex portion 28 moves from the fitting concave portion 27. Come off. In this state, when the bottom wall 16 is moved back and forth with respect to the seat portion 1 along the arcuate curved surface with the support shaft 20 as a fulcrum, the backrest portion 3 is supported by the support shaft 3 as shown by a chain line in FIG. Swing around 20 axes. After that, when the backrest operating tool 25 is pulled downward from the pulled state, the fitting convex portion 28 is fitted into any one of the fitting concave portions 27. Thereafter, the backrest operating tool 25 is rotated. Then, when the lock member 38 is returned from the unlock position Y1 to the lock position X1, both ends of the lock member 38 engage with the engaging recess 37, so that the fitting convex portion 28 is fitted into the fitting concave portion 27. In this state, the support block 32 is locked so as not to move downward. Therefore, reclining adjustment of the backrest part 3 can be easily performed by operating the backrest operating tool 25.

  In addition, in the case of the above-described embodiment, the upper side of the backrest 4 is supported so as to be swingable around the support shaft 20 in the left-right direction with respect to the seat body 2, and the bottom wall 16 of the backrest 4 is seated on the seat body 2. Since the backrest engaging mechanism 23 is provided to engage and hold the part 1 so as to be movable back and forth around the support shaft 20, the upper side of the backrest body 4 is not greatly swung by the reclining adjustment. The fluctuation of the center of gravity of the infant seat for bicycles where the infant sits is reduced, and the bicycle equipped with the infant seat for bicycles is less likely to wobble and is stable.

  Further, since the backrest locking mechanism 24 for locking the backrest engagement mechanism 23 in the engaged state is provided, the engagement of the backrest engagement mechanism 23 is unexpectedly disengaged or switched due to vibration of the bicycle or the like. Can be prevented by the backrest lock mechanism 24, and a backrest operating tool 25 for releasing the engagement by the backrest engagement mechanism 23 or switching the backrest lock mechanism 24 between the locked state and the unlocked state is provided. Since it is provided on the lower surface side of the seat 1 and the bottom wall 16, there is no risk that an infant sitting on the bicycle infant seat touches the backrest operating tool 25, and an infant sitting on the bicycle infant seat erroneously backrests. It is possible to reliably prevent the backrest body 4 from swinging back and forth unexpectedly by touching the operation tool 25. Further, since the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are superposed so as to be movable back and forth, the seat body 2 and the backrest body 4 can be moved back and forth so as not to rattle each other. Can be assembled stably.

  Further, the rear part of the pair of left and right body side walls 11 of the seat body 2 and the front part of the pair of left and right backrest side walls 17 of the backrest body 4 are overlapped to the left and right, and the front upper side of the pair of left and right backrest side walls 17 is the body side wall. 11 is supported so as to be swingable around the support shaft 20 when the backrest body 4 is moved and adjusted around the support shaft 20 by the superposition of the main body side wall 11 and the backrest side wall 17. The body 4 can be prevented from rattling to the left and right with respect to the seat body 2 and the back body 4 can be prevented from rattling to the left and right with respect to the seat body 2 even after movement adjustment. It can be stably attached to the main body 2.

  Further, since the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are superposed on each other in an arcuately curved overlapping surface with the support shaft 20 as a fulcrum, the backrest body 4 can be moved back and forth. When adjusting the back and forth movement, the bottom wall 16 of the backrest body 4 is prevented from rattling in the vertical direction with respect to the seat portion 1 of the seat body 2, and the backrest body 4 can be easily and smoothly around the support shaft 20. Can be adjusted back and forth. Further, the bottom wall 16 of the backrest body 4 can be stably fixed so as not to rattle in the vertical direction with respect to the seat portion 1 of the seat body 2 even after the front-rear adjustment.

  Further, the backrest engaging mechanism 23 is provided with a plurality of fitting recesses 27 arranged on the overlapping surface of the bottom wall 16 along the arc direction around the support shaft 20 and the seat portion 1 facing the fitting recesses 27. The fitting projection 28 is removably held, and the fitting projection 28 is selected as a plurality of fitting recesses 27 for engaging the bottom wall 16 with the seat portion 1 so as to be movable back and forth. Since the fitting projection 28 is fitted into the fitting recess 27, the backrest body 4 is more reliably and securely prevented from rattling back and forth and right and left with respect to the seat body 2. It can be stably fixed, and the state in which the fitting convex portion 28 is fitted to the fitting concave portion 27 by the backrest lock mechanism 24 can be reliably held.

  In addition, since the urging member 35 that urges the support block 32 toward the fitting recess 27 is provided, the fitting protrusion 28 is fitted into the fitting recess 27 by the urging force of the urging member 35. Can be prevented, and the backrest 3 of the backrest 4 can be prevented from unexpectedly moving back and forth with respect to the seat 1 of the seat body 2. The fixed state of can be maintained more firmly.

  Further, when the lock member 38 is rotated to the lock position X 1 by the backrest operating tool 25, the lock member 38 is engaged with the engagement recess 37, so that the fitting convex portion 28 is fitted into the fitting concave portion 27. In this state, the support block 32 is locked so as not to move downward, and when the lock member 38 is rotated to the unlocking position Y1 by the backrest operating tool 25, the lock member 38 is disengaged from the locking recess 37, whereby the support block 32 32 can be moved up and down, and the fitting convex portion 28 can be retracted from the fitting concave portion 27 into the storage portion 29, so that the backrest lock can be achieved by rotating the lock member 38 with the backrest operating tool 25. The mechanism 24 can be easily and reliably switched between the locked state and the unlocked state. Further, by pulling the same backrest operating tool 25, the fitting convex portion 28 can be easily removed from the fitting concave portion 27, and the bottom wall 16 of the backrest body 4 is made to the seat portion 1 of the seat body 2. Therefore, it can be easily adjusted back and forth around the support shaft 20.

  According to the above embodiment, when the two seat belts 51 are extended, the ratchet operating tool 67 is rotated to rotate the lock member 74 from the lock position X2 to the lock release position Y2, and then the two seat belts. The two seat belts 51 can be easily unwound from the belt winder 52 by pulling the front 51. When the two seat belts 51 are wound up, the ratchet operating tool 67 may be pulled upward after the locking member 74 is rotated to the unlocking position Y2, and the winding rotary member 59 is biased by the winding spring 62. The two seat belts 51 can be easily wound around the belt winder 52 by automatically rotating in the winding direction. Further, when the seat belt 51 is attached to the infant, the seat belt 51 may be pulled out from the belt winder 52 and connected to the connecting belt 53 after the infant sits on the infant seat. Can be installed. After that, if the ratchet operating tool 67 is rotated and the lock member 74 is rotated from the unlock position Y2 to the lock position X2, the lock member 74 is engaged with the engaging portion 73, thereby the ratchet. With the claw 69 engaged with the ratchet gear 68, the claw constituting member 70 is locked to the ratchet gear 68 side, and the seat belt 51 cannot be fed out.

  Further, in the case of the above embodiment, since the two seat belts 51 can be wound around the belt winder 52 on the front side of the seat portion 1, when the infant sits on the infant seat, the seat is conventionally used. The belt 51 does not get in the way. Further, when the seat belt 51 is attached to an infant, the seat belt 51 may be fed out from the belt winder 52 and connected to the connecting belt 53 after the infant is seated on the infant seat. Can be attached to.

  In addition, a rotation lock mechanism 66 that locks the ratchet pawl 69 in a state engaged with the ratchet gear 68 and disables the rotation of the winding rotary member 59 is provided. By locking the take-up rotating body 59 after the belt 51 is mounted, it becomes impossible for the infant sitting on the infant seat to unnecessarily unwind the seat belt 51 from the belt winder 52 due to mischief, etc. A good wearing state of the seat belt 51 can be maintained for the infant sitting on the infant seat. Further, a ratchet operating tool 67 for separating the ratchet pawl 69 from the ratchet gear 68 is provided so that the winding rotary member 59 is rotated in the winding direction of the seat belt 51 by the urging force of the winding spring 62. Thus, when the seat belt 51 attached to the infant is removed, the two seat belts 51 are locked by the rotation lock mechanism 66 so that the seat belt 51 cannot be fed out. The seat belt 51 can be automatically wound by the urging force of the winding spring 62, which is convenient.

  In addition, a foot opening 12 is provided in front of the seat portion 1, a partition wall 13 that protrudes forward from the central portion in the left-right direction of the seat portion 1 and separates the foot opening 12 left and right is provided. The storage recess 56 is provided in the lower part of the storage recess 56, and the belt retractor 52 is stored and held in the storage recess 56. Therefore, the belt retractor 52 is disposed in front of the crotch of the infant sitting on the infant seat. From this point, the two seat belts 51 can be fed out. From this point, the seat belt 51 can be easily and satisfactorily attached to the infant sitting on the infant seat.

Further, the headrest 5 is held on the backrest 4 so that the headrest 5 can be adjusted up and down, and a pair of connecting belts 53 are connected to the left and right sides of the headrest 5, so that the headrest 5 is connected with the headrest 5 according to the size of the infant sitting on the infant seat. The height position of the belt 53 can be adjusted, and the seat belt 51 can be satisfactorily worn according to the size of the infant sitting on the infant seat.
Further, since the belt winder 52 has a winder case 58, the belt winder 52 is wound in the winder case 58 by a winding rotor 59, a claw constituting member 70, a ratchet spring 71, and a rotation lock. In a state where the mechanism 66 is stored compactly, the belt winder 52 can be easily arranged on the front side of the seat portion 1, and the seat belt 51 can be fed out by rotating the ratchet operating tool 67 It is possible to easily switch to a state where it cannot be fed out, which is convenient.

  According to the above-described embodiment, when the handle 85 is moved and adjusted relative to the pair of left and right seat side walls 21, the turning operation body 94 is operated to rotate the fitting body 87 from the fixed position A to the fixed release position B. After the movement, the handle 85 may be pressed or pulled back and forth, and the pair of left and right fitting bodies 87 respectively move the pair of upper and lower clamping rails 86 back and forth. Further, after the handle 85 is moved back and forth, the rotating operation body 94 is operated to rotate the fitting body 87 from the fixing release position B to the fixing position A. The pair of left and right fitting bodies 87 are respectively paired up and down. The clamping rail 86 is fixed so that it cannot move back and forth. Accordingly, the handle 85 can be easily adjusted in the front-rear direction by the turning operation of the turning operation body 94.

  Moreover, the pair of left and right seat side walls 21 are provided with a pair of upper and lower sandwiching rails 86 in the front-rear direction, and the fitting body 87 is held between the pair of sandwiching rails 86 so as to be movable back and forth. The handle 85 can be moved and adjusted in a large range in the front-rear direction and finely by the turning operation. Accordingly, the handle 85 can be easily set to a suitable front-rear position in accordance with the growth of the infant sitting on the infant seat, and the handle 85 can be grasped satisfactorily for a long time from when the infant sitting on the infant seat is small. Can do.

  Further, a deformable portion 93 that is elastically deformable radially inward is provided on the outer peripheral portion corresponding to the radial direction of the fitting body 87, and the pair of upper and lower sandwiching rails 86 repeats separation and approach from each other in the front-rear direction. Therefore, when the fitting body 87 is rotated to the fixing release position B, the fitting body 87 is fitted between the pair of upper and lower clamping rails 86 by making good use of the elastic deformation of the deformation portion 93 of the fitting body 87. It can be smoothly moved back and forth while being held together, and when the fitting body 87 is rotated to the fixed position A, the deformed portion 93 of the fitting body 87 is disengaged from the pair of holding rails 86, and By utilizing the wave shape of the pair of sandwiching rails 86, the fitting body 87 can be firmly fixed between the pair of sandwiching rails 86 so as not to move back and forth.

  20 and 21 show another embodiment, in which a cylindrical support shaft 20 protrudes outwardly on the front upper side of the pair of left and right backrest side walls 17 of the backrest body 4, and the pair of left and right seat bodies 2 A mounting hole 121 corresponding to the support shaft 20 is provided in the rear part of the main body side wall 11, and by inserting the support shaft 20 into the mounting hole 121 and fixing the retaining cap 122 to the insertion end of the support shaft 20, The front upper side of the pair of backrest side walls 17 is supported on the rear upper side of the main body side wall 11 so as to be swingable around the support shaft 20, and the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are supported by the support shaft. The polymerization surfaces are curved in a circular arc shape with 20 as a fulcrum, and are superposed so as to be movable back and forth.

  A longitudinal hole 123 in the front-rear direction is formed in the seat portion 1 of the seat body 2, and is provided on the overlapping surface (upper surface) of the seat portion 1 on both the left and right sides of the elongated hole 123 so as to be aligned in the arc direction around the support shaft 20. A plurality of locking gears 124 are formed on the left and right. An insertion hole 125 is provided in the center of the bottom wall 16 of the backrest body 4, and a pair of left and right engagement claws 127 are provided on the overlapping surface (lower surface) side of the bottom wall 16 of the backrest body 4 with the insertion hole 125 interposed therebetween. It has been.

  The backrest engagement mechanism 23 includes the plurality of locking gears 124 provided on the overlapping surface of the seat 1 and an engagement claw 127 provided at the center of the bottom wall 16. By providing the letter-shaped slit 128, the engaging claw 127 can be moved toward and away from the locking gear 124 by elastic deformation of the center portion of the bottom wall 16, and the engaging claw 127 can be moved toward and away from the bottom wall 16 of the backrest body 4. Is configured to selectively mesh with a plurality of locking gears 124 so as to engage the seat portion 1 so as to be adjustable in the front-rear direction. The backrest locking mechanism 24 has a cross-shaped lock member 38 disposed on the upper surface side of the bottom wall 16, and the backrest operating tool 25 and the lock member 38 disposed on the lower surface side of the seat portion 1, the seat portion 1 and the bottom wall. The backrest operating tool 25 and the lock member 38 are connected to each other with a fastener such as a bolt and nut (not shown) so that they cannot be rotated relative to each other. A plurality of arc-shaped protrusions 130 having a central portion of 38 as a fulcrum are formed at equal intervals in the circumferential direction.

  Thus, when the lock member 38 is rotated to the lock position X1 by the rotation operation of the backrest operation tool 25, the lock member 38 is brought into contact with the center portion of the bottom wall 16 from above so that the backrest lock is achieved. The mechanism 24 is configured to lock the engaging claw 127 in a state of being engaged with the locking gear 124. Further, when the locking member 38 is rotated to the unlocking position Y1 by the rotation operation of the backrest operating tool 25, the locking member 38 rides on the arc-shaped protrusion 130, whereby the engaging claw 127 is engaged with the locking gear 124. The backrest engaging mechanism 23 is unlocked from the upper position, and the lock member 38 lifts the backrest operating tool 25 upward so that the backrest operating tool 25 moves the center of the seat 1 upward. By pressing, the engaging claw 127 is configured to be separated from the locking gear 124 by elastic deformation of the central portion of the seat portion 1. Accordingly, the backrest operating tool 25 functions as a switching operation tool for switching the backrest locking mechanism 24 between the locked state and the unlocked state, and also releases the engagement by the backrest engaging mechanism 23. It functions as an operation tool.

  The other points are the same as in the case of the embodiment of FIGS. 1 to 19, and the upper side of the backrest body 4 does not need to be greatly swung by the reclining adjustment, as in the case of the embodiment. The fluctuation of the center of gravity of the infant seat for bicycles where the infant sits is reduced, and the bicycle equipped with the infant seat for bicycles is less likely to wobble and is stable. Further, the backrest locking mechanism 24 can prevent the backrest engaging mechanism 23 from being unexpectedly disengaged or switched due to bicycle vibration or the like, and the backrest locking mechanism 24 can be switched between a locked state and an unlocked state. Since the backrest operating tool 25 for switching operation is provided on the lower surface side of the seat 1 and the bottom wall 16, there is no possibility that an infant sitting on the bicycle infant seat touches the backrest operating tool 25, and the bicycle It is possible to reliably prevent an infant sitting on the infant seat from accidentally touching the backrest operating tool 25 and unintentionally swinging the backrest body 4 back and forth. Further, since the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are superposed so as to be movable back and forth, the seat body 2 and the backrest body 4 can be moved back and forth so as not to rattle each other. Can be assembled stably.

  FIG. 22 shows another embodiment, and the support shaft 20 is inserted into the mounting hole 121 and the retaining cap 122 is externally fitted to the insertion end portion of the support shaft 20 in the same manner as in the embodiment of FIGS. By fixing, the front upper side of the pair of left and right backrest side walls 17 is supported on the rear upper side of the main body side wall 11 so as to be swingable about the support shaft 20, and the seat portion 1 of the seat body 2 and the bottom of the backrest body 4 are supported. The wall 16 and the wall 16 are superposed so as to be movable back and forth on an arcuate overlapping surface with the support shaft 20 as a fulcrum.

  A long hole 123 in the front-rear direction is formed in the bottom wall 16, and a plurality of members are provided on the overlapping surface (lower surface) of the bottom wall 16 and are arranged on the left and right sides of the long hole 123 and arranged in the arc direction around the support shaft 20. A pair of left and right stop gears 124 are formed. An insertion hole 125 is provided in the center of the seat portion 1 of the seat body 2, and a pair of left and right engagement claws 127 are provided on the overlapping surface (upper surface) side of the seat portion 1 of the seat body 2 with the insertion hole 125 interposed therebetween. Yes.

  The backrest engaging mechanism 23 includes the plurality of locking gears 124 provided on the overlapping surface (lower surface) of the bottom wall 16, and the engaging claws 127 provided on the overlapping surface (upper surface) side of the seat portion 1. By providing a U-shaped or U-shaped slit 128 in the seat portion 1, the engaging claw 127 can move toward and away from the locking gear 124 by elastic deformation of the central portion of the seat portion 1. The engaging claw 127 is configured to selectively mesh with the plurality of locking gears 124 so as to engage the bottom wall 16 of the backrest body 4 with the seat portion 1 so as to be adjustable in the front-rear direction.

  The backrest locking mechanism 24 includes a bolt 131 inserted from the upper surface side of the bottom wall 16 into the long hole 123 of the bottom wall 16 and the insertion hole 125 of the seat portion 1, and a backrest operating tool 25 configured by a knob nut. ing. A rectangular washer 132 is provided on the upper surface side of the bottom wall 16, a fitting recess 133 is formed in the washer 132, and the head of the bolt 131 is fitted into the fitting recess 133 so as not to be relatively rotatable. 132 is fitted and held in a fitting recess (not shown) formed on the upper surface side of the bottom wall 16 so as not to rotate, and the backrest operating tool 25 (knob nut) is disposed on the lower surface side of the seat portion 1 and is attached to the bolt 131. When the backrest operating tool 25 is tightened by screwing from the lower surface side of the seat portion 1, the pair of left and right engaging claws 127 are moved upward by elastic deformation of the central portion of the seat portion 1, and the pair of left and right engaging claws. The backrest engagement mechanism 23 is locked in a state in which 127 is engaged with the locking gear 124. Further, by loosening the backrest operating tool 25, the backrest engaging mechanism 23 is unlocked, and the engaging claw 127 is separated from the locking gear 124 by the elastic deformation restoring force of the central portion of the seat portion 1. Is configured to do. Accordingly, the backrest operating tool 25 functions as a switching operation tool for switching the backrest locking mechanism 24 between the locked state and the unlocked state, and also releases the engagement by the backrest engaging mechanism 23. It functions as an operation tool.

  23 and 24 show another embodiment, in which the seat body 2 has a seat portion 1, a pair of left and right body side walls 11 and a back wall 136, and the backrest body 4 has a backrest portion 3 and a pair of left and right sides. The backrest side wall 17 and the bottom wall 16 are integrally formed. Cylindrical support shafts 20 project outwardly from the front upper side of the pair of left and right backrest side walls 17 of the backrest body 4, and the upper and lower portions corresponding to the support shafts 20 at the rear of the pair of left and right main body side walls 11 A mounting hole 121 that is long in the direction is provided, and the backrest 4 is seated together with the support shaft 20 by inserting the support shaft 20 into the installation hole 121 and fixing the retaining cap 122 to the insertion end of the support shaft 20. The main body 2 is supported so as to be swingable around the support shaft 20 and movable up and down within the range of the mounting hole 121, and the bottom wall 16 of the backrest body 4 is movable back and forth on the seat portion 1 of the seat main body 2. Polymerized.

  A fitting recess 137 and an insertion hole 138 are provided in the center portion of the bottom wall 16 of the backrest 4, and a pair of front and rear circular locking holes 139 and a pair of front and rear locking holes 139 are formed in the seat portion 1 of the seat body 2. And a small connecting hole 140 for connecting the two. An engagement member 144 having a head portion 141, a flat engagement portion 142, and a shaft portion 143 is provided on the upper surface side of the bottom wall 16, and the backrest operating tool 25 and the engagement member disposed on the lower surface side of the seat portion 1. 144, the backrest operating tool 25 and the engaging member 144 are connected to each other with a fastener such as a bolt and nut (not shown) so that the bottom wall 16 and the seat portion 1 are vertically sandwiched between the engaging member 144 and the engaging member 144. The head 141 is fitted into the fitting recess 137 so as to be rotatable about the axis, and the engaging portion 142 is inserted into one of the pair of front and rear locking holes 139. Thus, when the backrest operating tool 25 is turned, the engaging member 144 is turned to the engaging position where the engaging portion 142 faces in the left-right direction (the engaging portion 142 becomes longer in the left-right direction). Then, the engaging portion 142 of the engaging member 144 is engaged with one of the pair of front and rear locking holes 139 so as not to move back and forth, so that the bottom wall 16 of the backrest 4 is placed on the seat portion 1 of the seat body 2. It becomes impossible to move back and forth. Further, when the engagement portion 142 of the engagement member 144 is turned in the front-rear direction (the engagement portion becomes longer in the front-rear direction) by the turning operation of the backrest operation tool 25, the engagement member 142 is engaged. The engaging portion 142 of the member 144 can be moved back and forth between the pair of front and rear locking holes 139 through the connecting hole 140, whereby the bottom wall 16 of the backrest body 4 moves back and forth on the seat portion 1 of the seat body 2. Become free.

Accordingly, the backrest engaging mechanism 23 that engages and holds the bottom wall 16 of the backrest body 4 with respect to the seat portion 1 of the seat body 2 around the support shaft 20 so as to be movable back and forth is adjustable. The backrest operating tool 25 is configured by a locking hole 139, a connecting hole 140, and the like, and functions as an operating tool for releasing the engagement by the backrest engaging mechanism 23.
23 and 24, the backrest locking mechanism 24 is omitted. For example, the backrest operation tool 25 is provided with a closing piece for closing the connecting hole 140 so as to be openable and closable. The closing piece is fitted and closed in the connection hole 140 by urging or the like, and the closing piece is separated from the connection hole 140 when the backrest operating tool 25 or the closing piece is pulled against the urging of the spring. Then, a backrest locking mechanism 24 that locks the backrest engaging mechanism 23 in the engaged state may be provided. In this case, the backrest operating tool 25 functions as a switching operation tool for switching the backrest locking mechanism 24 between the locked state and the unlocked state, and is engaged by the backrest engaging mechanism 23. It will function as an operating tool for the release operation.

  25 and 26 show another embodiment, in which the seat body 2 integrally includes a seat portion 1 and a pair of left and right body side walls 11, and the backrest body 4 has a backrest portion 3 and a pair of left and right backrest side walls. 17 and the bottom wall 16 are integrally provided. The pair of left and right backrest side walls 17 of the backrest body 4 are arranged outside the pair of left and right main body side walls 11 of the seat body 2, and the pair of left and right main body side walls 11 of the seat body 2 and the pair of right and left backs of the backrest body 4 are arranged. The curled side wall 17 is superposed on the left and right. Further, the seat portion 1 of the seat body 2 is disposed on the bottom wall 16 of the backrest body 4, and the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are overlapped so as to be movable back and forth. .

As in the case of the embodiment of FIGS. 1 to 19 or the embodiment of FIGS. 20 and 21, the backrest body 4 is supported so as to be swingable around the support shaft 20 with respect to the seat body 2, and The seat portion 1 and the bottom wall 16 of the backrest 4 are superposed so as to be movable back and forth with a superposed surface curved in an arc shape with the support shaft 20 as a fulcrum.
The backrest engagement mechanism 23 includes a plurality of fitting recesses 27 provided on the seat portion 1 and a fitting protrusion 28 provided on the bottom wall 16, and the plurality of fitting recesses 27 are formed on the lower surface of the seat portion 1 ( And the fitting convex portion 28 is held so as to be movable in and out toward the fitting concave portion 27 of the bottom wall 16, and the fitting convex portion 28 is provided on the bottom wall. 16 is configured to be selectively fitted into a plurality of fitting recesses 27 so as to engage the seat portion 1 so as to be adjustable in the longitudinal direction.

  On the lower surface side of the bottom wall 16 of the backrest 4, a ring-shaped holding body 171, a pair of left and right positioning projections 172, and a holding cylinder body 174 having an insertion hole 173 are provided. On the lower surface side of the bottom wall 16, a backrest operating tool 176 for operating the backrest engaging mechanism 23 (fitting convex portion 28) between the engaged state X3 and the disengaged state Y3 is provided. A support shaft 177 having a square bar shape protrudes from the backrest operating tool 176, and the backrest operating tool 176 is rotatably held around the support shaft 177 by the holding body 171, and the support shaft 177 is rotated by the holding cylinder 174. The fitting convex portion 28 is fitted and fixed to the tip end portion (front end portion) of the support shaft 177 through a square hole 178. The fitting convex portion 28 is formed in a semicircular plate shape, and the fitting convex portion 28 rotates around the support shaft 177 together with the support shaft 177 by rotating the backrest operating tool 176 around the support shaft 177. Then, the fitting convex part 28 moves to and from the fitting concave part 27 of the bottom wall 16. Accordingly, the backrest operating tool 176 functions as an operating tool for releasing the engagement by the backrest engaging mechanism 23 and also engages with the backrest engaging mechanism 23 (the fitting convex portion 28 is fitted into the fitting concave portion). It functions as an operating tool for operating.

  A long cylindrical positioning cylinder 179 is fitted and fixed to the base of the support shaft 177, and the positioning cylinder 179 rotates around the support shaft 177 by rotating the backrest operation tool 176 around the support shaft 177. Then, a pair of left and right positionings on the left and right sides of the positioning cylinder 179 at the fitting position X3 (fitting state of the backrest engaging mechanism 23) where the fitting convex part 28 faces upward and engages with the fitting concave part 27. The protrusion 172 engages and positions the fitting protrusion 28 through the backrest engaging mechanism 23 at the fitting position X3, and the fitting protrusion 28 faces downward and is released from the fitting recess 27. At the position (disengagement state of the backrest engagement mechanism 23) Y3, the pair of left and right positioning projections 172 are engaged with the left and right sides of the positioning cylinder 179, and the fitting projections 28 to 28 are engaged at the mating release position Y3. Configured to position backrest engagement mechanism 23 To have. Therefore, the positioning mechanism 181 for positioning the backrest engaging mechanism 23 in the engaged state X3 and in the disengaged state Y3 is constituted by the positioning cylinder 179 and the pair of left and right positioning convex portions 172.

  In the case of the above embodiment, as in the case of the above embodiment, the reclining adjustment does not cause the upper side of the backrest body 4 to swing significantly, and the fluctuation of the center of gravity of the infant seat for bicycles on which the infant sits is reduced. Bicycles equipped with bicycle infant seats are less likely to wobble and become stable. In addition, a backrest operating tool 176 for operating the backrest engagement mechanism 23 between the engagement state X3 and the engagement release state Y3 is provided, and the backrest engagement mechanism 23 is positioned in the engagement state X3 and is engaged. Since the positioning mechanism 181 for positioning in the combined release state Y3 is provided, the backrest operating mechanism 176 can be easily and reliably operated in the engaged state X3 and the disengaged state Y3 by the backrest operating tool 176. Can do.

  27 to 32 show other embodiments, in which the seat body 2 integrally includes a seat portion 1 and a pair of left and right body side walls 11, and the backrest body 4 has a backrest portion 3 and a pair of left and right backrest side walls. 17 and the bottom wall 16 are integrally provided. A pair of left and right backrest side walls 17 of the backrest body 4 are disposed outside the pair of left and right main body side walls 11 of the seat body 2. Further, the seat portion 1 of the seat body 2 is disposed on the bottom wall 16 of the backrest body 4, and the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are overlapped so as to be movable back and forth. .

As in the case of the embodiment of FIGS. 1 to 19 or the embodiment of FIGS. 20 and 21, the backrest body 4 is supported so as to be swingable around the support shaft 20 with respect to the seat body 2, and The seat portion 1 and the bottom wall 16 of the backrest 4 are superposed so as to be movable back and forth with a superposed surface curved in an arc shape with the support shaft 20 as a fulcrum.
As shown in FIGS. 28 to 32, the backrest engagement mechanism 23 includes a plurality of fitting recesses 27 arranged in the front-rear direction on the overlapping surface of the seat portion 1, and a middle portion in the front-rear direction on the bottom wall 16. Is swingable around the horizontal axis 185, and protrudes from one end (front end) of the swinging member 186 in the front-rear direction, and the other end of the swinging member 186 in the front-rear direction is moved up and down. And a plurality of fitting recesses 27 in the arc direction around the support shaft 20 on the lower surface (overlapping surface) of the seat portion 1. Two sets are provided side by side.

  The rocking member 186 has a pair of left and right rocking bodies 188 and a connecting body 189 that connects the rear part of the rocking body 188, and a holding piece 190 that protrudes upward in a U-shape is provided on the rear part of the connecting body 189. An insertion hole 191 is formed between the piece 190 and the connecting body 189. Further, an upper projecting portion 193 is provided at the front portion of the connecting body 189, and an engaging groove 194 that opens upward is provided in the upper projecting portion 193.

A support convex portion 196 is provided on the bottom wall 16 so as to project downward. The support convex portion 196 is disposed between the pair of rocking bodies 188 of the rocking member 186 and supports the horizontal shaft 185 with the midway portion in the front-rear direction of the rocking body 188. By inserting the projection 196, the swing member 186 can swing about the horizontal axis 185 as described above.
A fitting convex portion 28 is projected upward from each front end portion of the pair of left and right oscillating bodies 188, and the pair of fitting convex portions 28 engage the bottom wall 16 with the seat portion 1 so as to be adjustable in the longitudinal direction. Therefore, it is configured so as to selectively fit into the two right and left sets of fitting recesses 27 respectively.

A backrest locking mechanism 24 that locks the backrest engaging mechanism 23 in the engaged state is provided. The backrest locking mechanism 24 includes a locking piece 198 that is movably supported on the other end (rear end) side of the swing member 186 in the front-rear direction, and a stopper piece that protrudes downward from the rear end portion of the bottom wall 16. 199.
The lock piece 198 has an operation portion 201 and a sliding plate portion 202 in an L shape, and the sliding plate portion 202 is disposed on the coupling body 189 and is inserted into the insertion hole 191 so as to be movable back and forth, thereby locking The piece 198 comes into contact with the stopper piece 199 from below and locks the fitting convex portion 28 in a state where the fitting convex portion 28 is fitted in the fitting concave portion 27, and the fitting convex portion 28 is disengaged from the stopper piece 199. It is held movably at a lock release position S that allows it to move out of the mating recess 27. Therefore, the backrest lock mechanism 24 can be switched between a locked state and an unlocked state with one hand by operating the lock piece 198.

  A locking projection 203 is provided at the front end of the locking piece 198 and a locking spring member 204 is integrally projected in a U-shape so that the locking spring member 204 contacts the upward projecting portion 193. When the lock piece 198 is urged toward the lock position R by the lock spring member 204 and the lock piece 198 is moved toward the lock release position S against the urge of the lock spring member 204, FIG. As shown in FIG. 2, the lock piece 198 is pressed against the front side wall surface of the stopper piece 199 by the urging force of the lock spring member 204 so that the lock piece 198 is held on the unlocking position S side. .

The engagement spring member 205 is engaged and held in the engagement groove 194 of the swing member 186, and the front end portion of the engagement spring member 205 contacts the lower surface of the bottom wall 16, so that the fitting convex portion 28 is fitted. The swing member 186 is biased in the direction of moving toward the recess 27.
The swing member 186, the lock piece 198, the lock spring member 204, and the engagement spring member 205 are each integrally formed of synthetic resin. Note that the lock spring member 204 and the engagement spring member 205 may be formed of a metal piece or the like.

  According to the above embodiment, as shown in FIG. 29, the lock piece 198 is in the lock position R and the fitting convex portion 28 is locked in the fitted state with the fitting concave portion 27. As shown, when the operation portion 201 of the lock piece 198 is pressed forward, when the lock piece 198 is moved to the unlocking position S side against the biasing force of the locking spring member 204, the biasing force of the locking spring member 204 is used. The lock piece 198 is pressed against the side wall surface of the stopper piece 199, and the lock piece 198 is held on the unlocking position S side. Thereafter, as shown in FIG. 32, when the rear end portion of the swinging member 186 is pressed upward, the swinging member 186 swings in the direction of the arrow H about the horizontal axis 185, and the pair of left and right fitting projections 28 are formed. The bottom wall 16 of the backrest body 4 can be moved back and forth with respect to the seat portion 1 of the seat body 2 by being detached from the pair of fitting recesses 27.

  Next, as shown in FIG. 32, the pair of left and right fitting projections 28 are paired from the state in which the lock piece 198 is in the unlocked position S and the pair of left and right fitting projections 28 are detached from the pair of fitting recesses 27. For example, the front part of the swinging member 186 may be pressed upward, and the swinging member 186 is moved around the horizontal axis 185 in the direction of arrow I by, for example, pressing the front part of the swinging member 186 upward. As shown in FIG. 29, the lock piece 198 returns to the lock position R, and the fitting convex portion 28 is engaged with the fitting concave portion 27.

  Accordingly, the backrest lock mechanism 24 can be switched between a locked state and an unlocked state by one hand operation of the lock piece 198, and reclining adjustment can be performed easily and reliably. In addition, as in the case of the above-described embodiment, the upper side of the backrest body 4 does not need to be greatly swung by the reclining adjustment, and the variation in the center of gravity of the bicycle infant seat on which the infant is seated is reduced. Bicycles equipped with are less likely to wobble and become stable.

  27 to 32, the pair of left and right backrest side walls 17 of the backrest body 4 are disposed outside the pair of left and right main body side walls 11 of the seat body 2, and the bottom wall 16 of the backrest body 4. The seat portion 1 of the seat body 2 is disposed above, but instead, the pair of left and right backrest side walls 17 of the backrest body 4 are disposed inside the pair of left and right body side walls 11 of the seat body 2, and the seat You may make it arrange | position the bottom wall 16 of the backrest body 4 on the seat part 1 of the main body 2. FIG.

  27 to 32, a plurality of fitting recesses 27 are provided in the front-rear direction on the overlapping surface of the seat 1, and the swing member 186 swings around the horizontal axis 185 on the bottom wall 16. A fitting projection 28 is provided on one end side in the front-rear direction of the swinging member 186 so as to be movable, but instead, a plurality of fittings are arranged side by side in the front-rear direction on the overlapping surface of the seat 1. The protrusion 28 may be provided, the swing member 186 may be swingably provided around the horizontal axis 185 on the bottom wall 16, and the fitting recess 27 may be protruded from one end of the swing member 186 in the front-rear direction. .

  33 and 34 disclose a bicycle infant seat invention different from the present invention. A support arm 147 protruding in an L shape is provided on the lower surface of the bottom wall 16 of the backrest body 4, and a pair of left and right support cylinders 148 are provided on the lower surface of the seat portion 1 of the seat body 2. Support cylinders 148 are arranged on both sides, a support shaft 149 is inserted into the base of the support arm 147 and the support cylinder 148, and the lower side of the backrest 4 is supported by the support shaft 149 with respect to the seat 1 of the seat body 2. It is supported so that it can swing back and forth. An arc-shaped long hole 151 having a support shaft 149 as a fulcrum is provided on the back side wall 17 of the backrest body 4 on the upper side, and the support shaft body 152 is inserted and held in the long hole 151 and the mounting hole 153 of the seat body 2. As a result, the upper side of the backrest 4 is held so as to be swingable around the support shaft 152 within the range of the long hole.

  A rotation damper 155 is provided between the seat 1 and the bottom wall 16 and concentrically with the support shaft 149 to brake the rotation torque around the support shaft 149 of the backrest 4. Further, a coil spring 156 is provided between the front portion of the support arm 147 and the seat portion 1, and the backrest body 4 is urged by the coil spring 156 to swing forward around the support shaft 149. Thus, the backrest 4 is configured to elastically recline (free reclining) around the support shaft 149 by the urging force of the rotating damper 155 and the coil spring 156.

  35 and 36 disclose another invention of the infant seat for bicycles different from the present invention. A pair of left and right support cylinders 158 are provided on the lower surface of the bottom wall 16 of the backrest body 4, and a support cylinder 159 is provided at the center of the lower surface of the seat 1, and the bottom wall 16 is interposed between the pair of support cylinders 158. A support cylinder 159 is disposed, a rotating damper 155 is housed and held in one of the pair of left and right support cylinders 158, and a support shaft 149 is mounted on the other support cylinder 158 of the bottom wall 16 and the support cylinder 159 of the seat portion 1. Is inserted into the support shaft 149, and the lower side of the backrest 4 is supported by the seat portion 1 of the seat body 2 so that it can swing back and forth around the support shaft 149 and rotate. The dynamic damper 155 is configured to brake the rotational torque around the support shaft 149 of the backrest 4.

  An arc-shaped elongated hole 151 having a support shaft 149 as a fulcrum is provided on the upper side of the body side wall 11 of the seat body 2, and a mounting hole 153 is provided in the backrest side wall 17 of the backrest body 4. The support shaft body 152 is inserted into the mounting hole 153 and the long hole 151 of the main body side wall 11, and the retaining body 161 is attached to the insertion end of the support shaft body 152, so that the upper side of the backrest body 4 is placed on the seat body 2. On the other hand, it is held so as to be swingable around the support shaft 149 in the range of the long hole 151. A connecting shaft 162 projects outwardly in front of the long hole 151 in the main body side wall 11, and the coil spring 163 is connected between the connecting shaft 162 and the support shaft body 152, whereby the backrest body 4 is supported by the coil spring 163. It is energized to swing forward around. Thus, the backrest 4 is configured to recline elastically (free reclining) around the support shaft 149 by the urging force of the rotating damper 155 and the coil spring 163. A protective cover 165 covers the outer side of the coil spring 163.

  1 to 24, the pair of left and right backrest side walls 17 of the backrest body 4 are disposed inside the pair of left and right main body side walls 11 of the seat body 2, so The rear part of the main body side wall 11 and the front part of the pair of left and right backrest side walls 17 of the backrest body 4 are overlapped on the left and right, and the bottom wall 16 of the backrest body 4 is disposed on the seat portion 1 of the seat body 2. The seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 are superposed on each other in an arcuately curved overlapping surface with the support shaft 20 as a fulcrum. A pair of left and right backrest side walls 17 of the body 4 are disposed outside the pair of left and right body side walls 11 of the seat body 2, and a pair of left and right backrests of the back body 4 and the pair of left and right body side walls 11 of the seat body 2 are arranged. The side wall 17 may be overlapped to the left and right, and the seat book is placed on the bottom wall 16 of the backrest 4. 2 seat portions 1 are arranged, and the seat portion 1 of the seat body 2 and the bottom wall 16 of the backrest body 4 overlap with each other on an arcuately curved overlapping surface with the support shaft 20 as a fulcrum. You may do it. In this case, instead of providing the backrest operating tool 25 on the lower surface side of the seat portion 1 of the seat body 2, the backrest operating tool 25 is provided on the lower surface side of the bottom wall 16 of the backrest body 4. Also good.

  Further, in the above-described embodiment, the engagement by the backrest engagement mechanism 23 is released by the backrest operation tool 25, and the engagement by the backrest engagement mechanism 23 is performed, for example, by the urging of the urging member 35. However, instead of this, the urging member 35 and the like may be omitted, and the backrest engaging mechanism 23 may be engaged by manual operation of the backrest operating tool 25. For example, in the embodiment shown in FIGS. 1 to 19, the biasing member 35 is omitted, and the backrest operating tool 25 is pulled downward, whereby the fitting convex portion 28 is removed from the fitting concave portion 27, and the backrest operating tool 25. The fitting convex portion 28 may be fitted into the fitting concave portion 27 by pressing upward.

  In the embodiment shown in FIGS. 1 to 19, the fitting convex portion 28 is provided on the seat portion 1 side of the seat body 2, and the fitting concave portion 27 is provided on the bottom wall 16 side of the backrest 4. However, instead of this, the fitting concave portion 27 may be provided on the seat portion 1 side of the seat body 2, and the fitting convex portion 28 may be provided on the bottom wall 16 side of the backrest body 4. Further, the storage portion 29 and the support block 32 may be provided on the bottom wall 16 side of the backrest 4 instead of the seat portion 1 side of the seat body 2.

DESCRIPTION OF SYMBOLS 1 Seat part 2 Seat main body 3 Backrest part 4 Backrest body 5 Headrest 11 Main body side wall 12 Foot opening 13 Partition wall 16 Bottom wall 17 Backrest side wall 20 Support shaft 21 Seat side wall 23 Backrest engagement mechanism 24 Backrest lock Mechanism 25 Backrest operating tool 27 Fitting concave part 28 Fitting convex part 29 Storage part 32 Support block 35 Biasing member 37 Locking concave part 38 Lock member 51 Seat belt 52 Belt winder 53 Connecting belt 54 Male member 55 Female member 56 Storage recess 58 Winding case 59 Winding rotary body 62 Winding spring 65 Ratchet mechanism 66 Rotation lock mechanism 67 Ratchet operating tool 68 Ratchet gear 69 Ratchet claw 70 Claw component 71 Ratchet spring 74 Lock member 85 Handle 86 Holding rail 87 Fitting body 88 Insertion hole 89 Support cylinder 90 Support shaft 9 Deformable portion 94 rotating operation body 185 horizontal axis 186 swing member 198 lock piece 199 stopper piece 204 locking spring member 205 engaging the spring member

Claims (14)

  A seat body (2) having a seat (1) and a backrest (4) having a backrest (3) are provided separately, and the backrest (4) is forward from the lower end of the backrest (3). A protruding bottom wall (16) is provided, and the upper side of the backrest (4) is supported swingably around a support shaft (20) in the left-right direction with respect to the seat body (2). The seat portion (1) and the bottom wall (16) of the backrest body (4) are superposed so as to be movable back and forth, and the bottom wall (16) of the backrest body (4) is attached to the seat portion (2) of the seat body (2). The infant seat for bicycles is provided with a backrest engaging mechanism (23) that is engaged and held so as to be movable back and forth around the support shaft (20) with respect to 1).   A backrest lock mechanism (24) for locking the backrest engagement mechanism (23) in the engaged state is provided, and the backrest lock mechanism (24) can be switched between a locked state and an unlocked state with one hand. The infant seat for bicycles according to claim 1, wherein the infant seat is configured.   The backrest engaging mechanism (23) includes a plurality of fitting recesses (27) or fitting protrusions (1) arranged in the front-rear direction on one overlapping surface of the seat (1) or the bottom wall (16). 28), a swinging member (186) whose middle part in the front-rear direction is swingable about the horizontal axis (185) on the other of the seat (1) or the bottom wall (16), and a swinging member (186) ) Projecting at one end side in the front-rear direction and moving the other end side in the front-rear direction of the swinging member (186) in the up-down direction to protrude into the fitting concave portion (27) or the fitting convex portion (28). The infant seat for bicycles according to claim 1 or 2, further comprising a fitting convex portion (28) or a fitting concave portion (27) that moves backward. The backrest lock mechanism (24) includes a lock piece (198) held movably in the front-rear direction on the other end in the front-rear direction of the swing member (186), and a seat (1) or a bottom wall (16). A stopper piece (199) projecting downward,
The lock piece (198) is brought into contact with the stopper piece (199) from below, and the fitting convex portion (28) or the fitting concave portion (27) is fitted into the fitting concave portion (27) or the fitting convex portion (28). The locking position that locks in the combined state, and the fitting protrusion (28) or the fitting recess (27) is moved out of the fitting recess (27) or the fitting protrusion (28) by detaching from the stopper piece (199). The infant seat for bicycles according to claim 3, wherein the infant seat is movably held at an unlocking position allowing movement.   The lock piece (198) is biased toward the lock position by the lock spring member (204), and the lock piece (198) is moved to the lock release position side against the bias of the lock spring member (204). Then, the locking piece (198) is pressed against the side wall surface of the stopper piece (199) by the urging force of the locking spring member (204) so that the locking piece (198) is held on the unlocking position side. The infant seat for bicycles according to claim 4, wherein the infant seat is configured.   A spring member for engagement that biases the swing member (186) in a direction in which the fitting convex portion (28) or the fitting concave portion (27) moves toward the fitting concave portion (27) or the fitting convex portion (28). (205) is provided, The infant seat for bicycles of any one of Claims 3-5 characterized by the above-mentioned.   A backrest operating tool (176) for operating the backrest engagement mechanism (23) between the engagement state (X3) and the engagement release state (Y3) is provided, and the backrest engagement mechanism (23) is The infant seat for bicycles according to claim 1, further comprising a positioning mechanism (181) for positioning in the engaged state (X3) and positioning in the disengaged state (Y3).   A backrest operating tool (25) for operating the backrest engaging mechanism (23) is provided, and a backrest locking mechanism (24) for locking the backrest engaging mechanism (23) in the engaged state is provided. The backrest operating tool (25) is also used as a switching operating tool for switching the backrest locking mechanism (24) between a locked state and an unlocked state. Infant seat for bicycle as described.   The seat body (2) has a pair of left and right body side walls (11) in addition to the seat portion (1), and the backrest body (4) includes the backrest portion (3) and the bottom wall (16). A pair of left and right backrest side walls (17) are provided in the left and right side walls (11) of the seat body (2) and a pair of left and right backrest side walls (17) of the backrest body (4). The left and right pair of backrest side walls (17) are supported on the main body side wall (11) so as to be swingable around the support shaft (20). The infant seat for bicycles as described in the section.   The seat part (1) of the seat body (2) and the bottom wall (16) of the backrest (4) are superposed so that they can move back and forth with an arcuate curved surface with the support shaft (20) as a fulcrum. The backrest engaging mechanism (23) is provided with a plurality of fittings provided on one overlapping surface of the seat (1) or the bottom wall (16) side by side in the arc direction around the support shaft (20). A recess (27) and a fitting protrusion (28) held on the other side of the seat (1) or the bottom wall (16) so as to be movable in and out toward the fitting recess (27). The mating convex part (28) is configured to selectively fit into the plurality of fitting concave parts (27) so as to engage the bottom wall (16) with the seat part (1) so as to be movable back and forth. The backrest locking mechanism (24) is configured to lock the fitting convex portion (28) in a state of being fitted into the fitting concave portion (27). Bicycle infant seat described.   On the other side of the seat (1) or the bottom wall (16), a storage part (29) is provided corresponding to the fitting recess (27), and the support block (32) is fitted in the storage part (29). The fitting projection (28) is held on the support block (32) so that the fitting projection (28) moves vertically from the storage portion (29) as the support block (32) moves up and down. ) And a biasing member (35) for biasing the support block (32) toward the fitting recess (27) is provided, and the backrest locking mechanism (24) The locking recess (37) provided so as to communicate with the fitting recess (27) side of the portion (29) and the backrest operating tool (25) to the locked position (X1) and the unlocked position (Y1) A locking member (38) that can be rotated, and the locking member (38) can be moved with the backrest operating tool (25). When the lock member (38) is rotated to the locking position (X1), the engagement protrusion (28) is engaged with the engagement recess (27) by engaging the locking recess (37). When the support block (32) is locked so as not to move in the state and the lock member (38) is rotated to the unlock position (Y1) by the backrest operating tool (25), the lock member (38) is locked into the locking recess. By disengaging from (37), the support block (32) is movable, and the fitting convex part (28) can be retracted from the fitting concave part (27) into the storage part (29). The infant seat for bicycles according to claim 10.   The backrest operating tool (25) is disposed on the lower surface side of the support block (32). The backrest operating tool (25) and the lock member (38) sandwich the support block (32) up and down, and the backrest is supported. The operating tool (25) and the lock member (38) are connected to each other so as to rotate about the vertical axis with respect to the support block (32), and the backrest operating tool (25) is rotated about the vertical axis. The locking member (38) is pivoted about the vertical axis to the locking position (X1) and the unlocking position (Y1) in conjunction with the back operation tool (25), and the locking member (38) is unlocked ( The support block (32) moves the storage portion (29) by moving the backrest operating tool (25) in a state rotated to Y1), and the fitting convex portion (28) becomes the fitting concave portion (27). 2. It is comprised so that it may remove | deviate from Bicycle infant seat according to.   The seat portion (1) of the seat body (2) and the bottom wall (16) of the backrest body (4) are superposed on each other on an arcuately curved overlapping surface with the support shaft (20) as a fulcrum. The backrest engaging mechanism (23) has an arc around the support shaft (20) on one overlapping surface of the seat (1) of the seat body (2) or the bottom wall (16) of the backrest (4). A plurality of locking gears (124) provided side by side in the direction, and a locking gear (124) on the other of the seat wall (1) of the seat body (2) or the bottom wall (16) of the backrest (4) And an engaging claw (127) provided so as to be able to move back and forth, and the engaging claw (127) engages the backrest bottom wall (16) so that it can be adjusted back and forth with respect to the seat (1). The backrest locking mechanism (24) is configured to selectively engage with the locking gear (124). Bicycle infant seat according to claim 8, characterized in that it is configured to lock the matching condition.   The backrest (4) is supported with the support shaft (20) so as to be swingable around the support shaft (20) and movable up and down with respect to the seat body (2), and the backrest bottom wall (16) is supported by the seat body. The infant seat for bicycles according to any one of claims 6, 8, and 9, characterized in that it is superposed on the seat (1) of (2) so as to be movable back and forth.

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