JP5528017B2 - bicycle - Google Patents

Description

  The present invention relates to a bicycle having auxiliary wheels.

  Conventionally, as this type of bicycle, for example, as shown in FIGS. 16 to 18, there is a bicycle 60 in which an auxiliary wheel 61 is provided on an auxiliary wheel stay 62 and the auxiliary wheel stay 62 is detachably attached. A rear edge 64 is provided at the rear portion of the vehicle body frame 63. The rear pawl 64 has a groove 65 that is open at the rear end and is long in the front-rear direction between the two claws. A rear wheel hub shaft 66 is inserted into the groove 65 and protrudes outward of the rear pawl 64.

  An auxiliary wheel mounting member 67 is fastened to the outer side of the rear pawl 64, and an upper end portion of the auxiliary wheel stay 62 is fastened to the auxiliary wheel mounting member 67. That is, upper and lower fastening holes 68 and 69 are formed in the auxiliary wheel mounting member 67. The rear wheel hub shaft 66 is inserted into the upper fastening hole 68, and a hub nut 70 is screwed into the rear wheel hub shaft 66 and tightened, whereby the auxiliary wheel mounting member 67 is fastened to the rear hook 64.

  A through hole 71 and a fixing nut 72 are provided at the upper end portion of the auxiliary wheel stay 62, and a bolt 73 is inserted into the lower fastening hole 69 and the through hole 71 of the auxiliary wheel stay 62 and screwed into the fixing nut 72. By doing so, the auxiliary wheel stay 62 is fastened to the auxiliary wheel mounting member 67.

  The auxiliary wheel mounting member 67 includes a pair of front and rear engaging portions 74 that are engaged with the lower end of the rear pawl 64 from below, and a pair of front and rear engaging pieces 75 that are engaged with the auxiliary wheel stay 62 from the front and rear direction D. Is formed.

  According to this, when a force in the front-rear direction D acts on the auxiliary wheel 61 during traveling, a moment in the front-rear direction D about the rear wheel hub shaft 66 is generated in the auxiliary wheel stay 62. In this case, since the auxiliary wheel stay 62 is engaged with the engagement piece 75 of the auxiliary wheel mounting member 67 in the front-rear direction D, and the engaging portion 74 of the auxiliary wheel mounting member 67 is engaged with the lower end of the rear edge 64, The auxiliary wheel stay 62 is fixed in the front-rear direction D and can be prevented from swinging in the front-rear direction D.

  Incidentally, a bicycle equipped with such auxiliary wheels is described in Patent Document 1 below.

JP 2001-206264 A

  However, in the conventional type, when the auxiliary wheel 61 is attached, the hub nut 70 (fastening member) for fastening the auxiliary wheel attaching member 67, the bolt 73 (fastening member) and the fixing nut for fastening the auxiliary wheel stay 62 are provided. 72 (fastening members) is required, and there is a problem that the number of these fastening members increases.

  When an excessive force acts on the auxiliary wheel 61 and the moment in the front-rear direction D about the rear wheel hub shaft 66 increases, stress concentrates on the auxiliary wheel mounting member 67 and the auxiliary wheel mounting member 67 There are problems such as deformation. As a countermeasure for this, it is conceivable to improve the strength of the auxiliary wheel mounting member 67, but on the other hand, the size and thickness of the auxiliary wheel mounting member 67 increase and become larger. Since the auxiliary wheel mounting member 67 is exposed to the outside of the upper end portion of the auxiliary wheel stay 62, when the auxiliary wheel mounting member 67 is enlarged, a part of the clothes is easily caught on the auxiliary wheel mounting member 67. is there.

  The present invention can reduce the number of fastening members required to mount the auxiliary wheel, prevent deformation of the auxiliary wheel mounting member even if an excessive force acts on the auxiliary wheel, and mount the auxiliary wheel. It aims at providing the bicycle which can suppress the enlargement of a member.

In order to achieve the above object, according to the first aspect of the present invention, the rear wheel hub shaft is inserted into through holes formed in the auxiliary wheel mounting member, the auxiliary wheel stay, and the spacer, respectively. Fastened by a fastening member that is screwed onto the wheel hub shaft, and is sandwiched between the rear wheel and the auxiliary wheel mounting member, and the auxiliary wheel mounting member engages at least one of the upper and lower ends of the rear wheel. And a second engagement portion that engages with the auxiliary wheel stay in the front-rear direction. The auxiliary wheel stay has a third engagement portion that engages with the spacer in the front-rear direction. It has an engaging projection to be fitted into the slot.

  According to this, since stress is distributed to the auxiliary wheel mounting member and the spacer, it is possible to prevent deformation of the auxiliary wheel mounting member and to suppress an increase in size of the auxiliary wheel mounting member. Further, since the spacer is sandwiched between the auxiliary wheel stay and the rear end, a part of the clothes is not easily caught by the spacer. Moreover, since it is only necessary to screw the fastening member to the rear wheel hub shaft in order to attach the auxiliary wheel, the number of fastening members required for attaching the auxiliary wheel can be reduced.

  As described above, according to the present invention, the number of fastening members required to mount the auxiliary wheel can be reduced, and deformation of the auxiliary wheel mounting member can be prevented even if an excessive force is applied to the auxiliary wheel. In addition, since the increase in size of the auxiliary wheel mounting member can be suppressed, it is difficult for a part of the clothes to be caught by the auxiliary wheel mounting member.

The perspective view of the bicycle with an auxiliary wheel in an embodiment of the invention Same as above, rear view of bicycle Same as above, exploded perspective view of the auxiliary wheel mounting portion of the bicycle Same as above, perspective view of rear edge of bicycle auxiliary wheel mounting part and spacer The perspective view of the auxiliary wheel attachment member of the auxiliary wheel attachment part of a bicycle same as the above The perspective view of the spacer of the bicycle auxiliary wheel mounting part The same figure, with the engagement protrusion of the spacer on the auxiliary wheel mounting part of the bicycle fitted into the rear groove The exploded rear view of the auxiliary wheel mounting part of the bicycle Side view of the bicycle auxiliary wheel mounting part X1-X1 arrow view in FIG. X2-X2 arrow view in FIG. Y1-Y1 arrow view in FIG. Y2-Y2 arrow view in FIG. Y3-Y3 arrow view in FIG. Y4-Y4 arrow view in FIG. The exploded perspective view of the auxiliary wheel attachment part of the conventional bicycle Same as above, rear view of bicycle auxiliary wheel mounting The figure which looked at the auxiliary wheel mounting member of the bicycle from the rear side

In the first invention, the auxiliary wheel is provided in the auxiliary wheel stay,
A bicycle with auxiliary wheel stays attached detachably,
The rear part of the body frame is provided,
The back end has a slot with one end open,
The rear wheel hub axle is inserted into the rear slot and protrudes outward from the rear,
Auxiliary wheel mounting member is arranged on the outer side of the rear,
An auxiliary wheel stay is disposed between the auxiliary wheel mounting member and the rear end,
A spacer is arranged between the auxiliary wheel stay and the rear end,
The rear wheel hub axle is inserted through the through holes formed in the auxiliary wheel mounting member, the auxiliary wheel stay and the spacer,
The auxiliary wheel stay and the spacer are fastened by a fastening member screwed to the rear wheel hub shaft, and are sandwiched between the rear wheel and the auxiliary wheel mounting member,
The auxiliary wheel mounting member has a first engagement portion that engages at least one of the upper and lower ends of the rear and a second engagement portion that engages with the auxiliary wheel stay in the front-rear direction.
The auxiliary wheel stay has a third engagement portion that engages with the spacer in the front-rear direction,
The spacer has an engaging projection to be fitted into a later slot.

According to this, when a force in the front-rear direction is applied to the auxiliary wheel during traveling, a moment in the front-rear direction around the rear wheel hub axle is generated in the auxiliary wheel stay. In this case, the auxiliary wheel stay is engaged with the second engagement portion of the auxiliary wheel mounting member in the longitudinal direction, and engage the first one end of the engaging portion after filling of the auxiliary wheel mounting member, the auxiliary wheel The third engagement portion of the stay engages with the spacer in the front-rear direction, and the engagement protrusion of the spacer engages with the rear slot. For this reason, the auxiliary wheel stay is fixed in the front-rear direction, and can be prevented from swinging in the front-rear direction about the rear wheel hub shaft.

  Thus, since the auxiliary wheel mounting member and the spacer prevent the auxiliary wheel stay from swinging in the front-rear direction, even if an excessive force acts on the auxiliary wheel and the moment increases, the stress is applied to the auxiliary wheel stay. Since the mounting member and the spacer are dispersed, the deformation of the auxiliary wheel mounting member can be prevented and the increase in the size of the auxiliary wheel mounting member can be suppressed, and a part of the clothes is caught by the auxiliary wheel mounting member. It becomes difficult. Further, since the spacer is sandwiched between the auxiliary wheel stay and the rear end, a part of the clothes is not easily caught by the spacer.

  Further, when attaching the auxiliary wheel stay together with the auxiliary wheel, the rear wheel hub shaft inserted into the rear slot is inserted into the through holes of the spacer, the auxiliary wheel stay and the auxiliary wheel mounting member, and then the fastening member is inserted. Screw on the rear wheel hub axle and tighten. As a result, the auxiliary wheel stay and the spacer are simultaneously fastened and sandwiched between the rear wheel and the auxiliary wheel mounting member. As described above, in order to attach the auxiliary wheel, the fastening member only has to be screwed to the rear wheel hub shaft, so that the number of fastening members required for attaching the auxiliary wheel can be reduced.

In the second aspect of the present invention, the rear slot is formed with a rear end opened and long in the front-rear direction,
The through hole of the spacer penetrates the engaging projection,
The upper end surface of the engaging protrusion engages with the upper end surface of the rear slot from below,
The lower end surface of the engaging protrusion engages with the lower end surface of the rear slot from above,
The front ends of the upper and lower end faces of the engaging protrusion are located in front of the through hole,
The rear ends of the upper and lower end faces of the engaging protrusion are located behind the through hole.

  According to this, the engagement range between the upper end surface of the engagement protrusion and the upper end surface of the slot can be secured sufficiently long in the front-rear direction, and the lower end surface of the engagement protrusion and the lower end surface of the slot Is sufficiently long in the front-rear direction. Thereby, even when an excessive force acts on the auxiliary wheel and the moment increases, the stress generated in the engaging protrusion is reduced, and the deformation of the engaging protrusion can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, reference numeral 1 denotes a children's bicycle having a pair of left and right auxiliary wheels 2. The body frame 3 of the bicycle 1 has a pair of left and right chain stays 4 and a back hawk 5, and a connecting portion between the rear end of the chain stay 4 and the back hawk 5 (that is, the rear portion of the body frame 3). Is provided with a rear edge 6.

  As shown in FIGS. 3 and 4, each of the left and right rear pawls 6 has a rear end (an example of one end) between the upper and lower two claw portions 6a and 6b and a long slot 7 in the front-rear direction D. doing. A rear wheel hub shaft 8 is inserted into the slot 7 and protrudes outward of the rear pawl 6, and a rear wheel 9 is disposed between the rear pawls 6. A male screw is formed on the outer peripheral surface of the rear wheel hub shaft 8.

  The auxiliary wheel 2 is rotatably attached to the auxiliary wheel stay 10. The auxiliary wheel stay 10 is formed in an L shape including a horizontal flange portion 11 and a vertical flange portion 12 and has a U-shaped cross-sectional shape.

  An auxiliary wheel mounting member 14 is disposed on the outer side of the rear pawl 6, an upper end portion of the auxiliary wheel stay 10 is disposed between the auxiliary wheel mounting member 14 and the rear pawl 6, and an upper end portion of the auxiliary wheel stay 10. A spacer 15 is disposed between the rear cover 6 and the rear cover 6.

  First to third through holes 16 to 18 are formed in the auxiliary wheel mounting member 14, the upper end portion of the auxiliary wheel stay 10, and the spacer 15, respectively. The rear wheel hub shaft 8 is inserted into the first to third through holes 16 to 18. The upper end portion of the auxiliary wheel stay 10 and the spacer 15 are fastened by a hub nut 19 (an example of a fastening member) that is screwed to the rear wheel hub shaft 8, and is sandwiched between the rear pawl 6 and the auxiliary wheel mounting member 14. ing.

  As shown in FIG. 5, the first through hole 16 is a long hole that is formed in the auxiliary wheel mounting member 14 and is long in the vertical direction. The auxiliary wheel mounting member 14 is formed in a U shape in a plan view, and a pair of front and rear mounting member engaging plates 21a and 21b (an example of a second engaging portion) bent inwardly at both front and rear ends thereof. )have. As shown in FIGS. 9, 10, 12, and 13, the upper end portion of the auxiliary wheel stay 10 is fitted between the mounting member engaging plates 21a and 21b, and the both mounting member engaging plates 21a and 21b are in the front-rear direction. At D, the upper end of the auxiliary wheel stay 10 is engaged.

  Further, as shown in FIGS. 5 and 11 to 13, a pair of front and rear attachment members engaging with the lower end (an example of one end) of the rear edge 6 is provided at the lower end portions of the attachment member engaging plates 21 a and 21 b. Joint claws 22a and 22b (an example of a first engaging portion) are formed.

  As shown in FIG. 3, the second through hole 17 is a long hole formed in the upper end portion of the auxiliary wheel stay 10 and extending in the vertical direction. As shown in FIGS. 10, 11, 13, and 14, the upper end portion of the auxiliary wheel stay 10 is formed in a U shape in a plan view, and the front and rear end portions are bent inwardly. It has a pair of stay engaging plates 23a and 23b (an example of a third engaging portion). The spacer 15 is fitted between the both stay engaging plates 23a and 23b, and the both stay engaging plates 23a and 23b engage with the spacer 15 in the front-rear direction D.

  As shown in FIGS. 4, 6, and 7, the spacer 15 is a quadrangular block-like member, and has an engagement protrusion 25 that fits into the slot 7 of the rear edge 6 on the inner surface. The third through hole 18 is formed in the spacer 15 and penetrates the engaging protrusion 25. The upper end surface 25a of the engaging projection 25 is engaged with the upper end surface 7a of the slot 7 from below, and the lower end surface 25b of the engaging projection 25 is engaged with the lower end surface 7b of the slot 7 from above.

  The front end A of the upper and lower end faces 25a and 25b of the engaging protrusion 25 is positioned in front of the third through hole 18, and the rear end B of the upper and lower end faces 25a and 25b of the engaging protrusion 25 is the third through hole. It is located behind the hole 18. The rear end surface of the engaging protrusion 25 is formed so as to be flush with the rear end surface of the spacer 15.

  As shown in FIG. 3, a hub washer 26 and a tip end portion of a mudguard stay 27 are provided between the auxiliary wheel mounting member 14 and the hub nut 19 screwed to the rear wheel hub shaft 8. A safety cap 28 is provided outside the hub nut 19.

Hereinafter, the operation of the above configuration will be described.
When the bicycle 1 is running with the auxiliary wheel stay 10 provided with the auxiliary wheel 2 attached, if a force in the front-rear direction D acts on the auxiliary wheel 2, the auxiliary wheel stay 10 has a state as shown in FIG. A moment M in the front-rear direction D about the rear wheel hub shaft 8 is generated. In this case, as shown in FIG. 10, the upper end portion of the auxiliary wheel stay 10 is engaged with both attachment member engaging plates 21a and 21b of the auxiliary wheel attachment member 14 in the front-rear direction D, and as shown in FIGS. In addition, both mounting member engaging claws 22a and 22b of the auxiliary wheel mounting member 14 are engaged with the lower end of the rear edge 6, and both stay engaging plates 23a and 23b of the auxiliary wheel stay 10 are both front and rear ends of the spacer 15 in the front-rear direction D. 7 and 14, the upper end surface 25 a of the engagement protrusion 25 of the spacer 15 engages with the upper end surface 7 a of the slot 7, and the lower end surface of the engagement protrusion 25. 25 b engages with the lower end surface 7 b of the slot 7. For this reason, the auxiliary wheel stay 10 is fixed in the front-rear direction D and can be prevented from swinging in the front-rear direction D about the rear wheel hub shaft 8.

  As described above, since the auxiliary wheel mounting member 14 and the spacer 15 prevent the auxiliary wheel stay 10 from swinging in the front-rear direction D, an excessive force acts on the auxiliary wheel 2 to increase the moment M. Even in this case, since the stress is distributed to the auxiliary wheel mounting member 14 and the spacer 15, the deformation of the auxiliary wheel mounting member 14 can be prevented, and the increase in the size of the auxiliary wheel mounting member 14 can be suppressed. It becomes difficult for a part of the clothes to be caught on the auxiliary wheel mounting member 14. Further, as shown in FIGS. 3, 10, and 14, since the spacer 15 is sandwiched between the upper end portion of the auxiliary wheel stay 10 and the rear edge 6, a part of the clothes is not easily caught by the spacer 15.

  Further, as shown in FIGS. 4, 6, and 7, the front end A of the upper and lower end faces 25a and 25b of the engaging protrusion 25 is located in front of the third through hole 18, and the upper and lower end faces 25a, Since the rear end B of 25b is located behind the third through-hole 18, the engagement range between the upper end surface 25a of the engagement protrusion 25 and the upper end surface 7a of the slot 7 is sufficient in the front-rear direction D. The engagement range between the lower end surface 25b of the engagement protrusion 25 and the lower end surface 7b of the slot 7 can be sufficiently long in the front-rear direction D. Thereby, even when the moment M increases, the stress generated in the engaging protrusion 25 is reduced, and deformation of the engaging protrusion 25 can be prevented.

  As shown in FIG. 3, the auxiliary wheel stay 10 can be removed together with the auxiliary wheel 2 by removing the hub nut 19 from the rear wheel hub shaft 8. Furthermore, when attaching the auxiliary wheel stay 10 together with the auxiliary wheel 2, the rear wheel hub shaft 8 inserted into the slot 7 of the rear edge 6 is connected to the spacer 15, the upper end portion of the auxiliary wheel stay 10, and the auxiliary wheel mounting member 14. The first through third through holes 16 through 18 are inserted into the hub washer 26 and the tip of the mudguard stay 27. Thereafter, the hub nut 19 is screwed onto the rear wheel hub shaft 8 and tightened.

  As a result, as shown in FIGS. 10 to 14, the upper end portion of the auxiliary wheel stay 10 and the spacer 15 are simultaneously fastened and sandwiched between the rear pawl 6 and the auxiliary wheel mounting member 14. In this way, since the auxiliary wheel 2 can be attached by screwing one hub nut 19 to the rear wheel hub shaft 8, the number of nuts 19 required for attaching the auxiliary wheel 2 can be reduced.

  In the above embodiment, as shown in FIGS. 11 and 12, the mounting member engaging claws 22 a and 22 b are engaged with the lower end of the rear pawl 6, but are engaged with the upper end of the rear pawl 6. May be. Further, a pair of front and rear mounting member engaging claws 22a and 22b are provided on the upper and lower portions of the mounting member engaging plates 21a and 21b so that the front and rear pair of mounting member engaging claws 22a and 22b May be engaged.

DESCRIPTION OF SYMBOLS 1 Bicycle 2 Auxiliary wheel 3 Car body frame 6 Rear claw 7 Groove hole 7a Groove hole upper end surface 7b Groove hole lower end surface 8 Rear wheel hub axle 10 Auxiliary wheel stay 14 Auxiliary wheel attachment member 15 Spacers 16-18 First to third Through hole 19 Hub nut (fastening member)
21a, 21b Mounting member engaging plate (second engaging portion)
22a, 22b Mounting member engaging claw (first engaging portion)
23a, 23b Stay engaging plate (third engaging portion)
25 engagement protrusion 25a upper end surface 25b of engagement protrusion lower end surface A of engagement protrusion front end B of both upper and lower end surfaces of engagement protrusion rear end of both upper and lower end surfaces of engagement protrusion

Claims (2)

Auxiliary wheels are provided on the auxiliary wheel stays,
A bicycle with auxiliary wheel stays attached detachably,
The rear part of the body frame is provided,
The back end has a slot with one end open,
The rear wheel hub axle is inserted into the rear slot and protrudes outward from the rear,
Auxiliary wheel mounting member is arranged on the outer side of the rear,
An auxiliary wheel stay is disposed between the auxiliary wheel mounting member and the rear end,
A spacer is arranged between the auxiliary wheel stay and the rear end,
The rear wheel hub axle is inserted through the through holes formed in the auxiliary wheel mounting member, the auxiliary wheel stay and the spacer,
The auxiliary wheel stay and the spacer are fastened by a fastening member screwed to the rear wheel hub shaft, and are sandwiched between the rear wheel and the auxiliary wheel mounting member,
The auxiliary wheel mounting member has a first engagement portion that engages at least one of the upper and lower ends of the rear and a second engagement portion that engages with the auxiliary wheel stay in the front-rear direction.
The auxiliary wheel stay has a third engagement portion that engages with the spacer in the front-rear direction,
The bicycle according to claim 1, wherein the spacer has an engaging projection to be fitted into a slot at the rear. The rear slot has an open rear end and is formed long in the front-rear direction,
The through hole of the spacer penetrates the engaging projection,
The upper end surface of the engaging protrusion engages with the upper end surface of the rear slot from below,
The lower end surface of the engaging protrusion engages with the lower end surface of the rear slot from above,
The front ends of the upper and lower end faces of the engaging protrusion are located in front of the through hole,
The bicycle according to claim 1, wherein the rear ends of both upper and lower end faces of the engaging protrusion are located behind the through hole.

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