JP2000135997A - Bicycle frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items of a bicycle, and to reduce a cost by arranging a pair of left/right rear fixing arms having both end parts integrally fixed to a rear curved chassis by opening an angle of a specific range with the vicinity of a rear wheel bearing part as a starting point. SOLUTION: A rear wheel T1 is installed in a rear wheel bearing part 14 of left/right rear fixing arms 13 in a rear curved chassis 9, and a front wheel T2 is installed in a front wheel bearing part 18 of a front fixing arm 17 supported through a front curved chassis 15 by a head lug 7 on the front end of an intermediate chassis 1, respectively. At this time, the rear fixing arms 13 are constituted as light/right pairs so as to be positioned on the left/right both end surfaces of the rear wheel T1 as well as to become parallel to each other through a mutually regular interval. Both end parts are bent in a chevron shape by opening an angle of at least 40 degrees to 160 degrees with the vicinity of the rear wheel bearing part 14 as a starting point, its one end is integrally fixed to a rear tail part 9a of the intermediate chassis 9, and the other end is integrally fixed to a base part 8 of the intermediate chassis 1, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a frame for a two-wheeled bicycle, and more particularly, to reducing the number of parts of a completed bicycle so as to reduce manufacturing and assembling costs, to reduce weight and improve design, and to improve muddyness. An object of the present invention is to prevent incomplete tightening of a hub axle due to attachment of a stay and to improve traveling safety.

[0002]

2. Description of the Related Art Conventionally known bicycles include a standing pipe between one of the hanger lugs and an upper seat lug, a lower pipe between the other of the hanger lugs and a head lug, and an upper pipe between the head lug and the seat lugs. There is a frame having a so-called front triangular frame interposed therebetween, or a frame in which the upper pipe is eliminated to form a single main pipe. It is constituted by a so-called rear triangular frame with a back fork interposed between the seat lugs and the rear pawl at the tip of the stay.

[0003]

However, in the above-described conventional frame structure, since the upright pipe and the lower pipe or the main pipe are both hanger lugs and are used as mounting starting points, it is difficult to get on and off the bicycle. There was not enough room for undercarriage in, and the feet were often caught and fallen. Also, to attach the rear wheel using the rear claw of the above-mentioned rear triangular frame, and to attach the front wheel to the front fork tip by holding the front fork stem on the head lug, the front wheel and rear Mudguards must be installed on any part of the wheel.

[0004] To attach the mudguard, holes are formed in the upper bridge portion of the back fork and the lower bridge portion of the chain stay for screwing. It is necessary to provide a stay and fix the free end together with the rear wheel axle. Similarly, for the front wheel side mudguard, the front fork itself must be threaded, and in addition to the front fork, a mudguard stay for supporting the front wheel mudguard is provided, and the free end of the mudguard Must be fastened to the wheel set.

Since the mudguard stays are fastened together by one fastening nut on each of the left and right sides of the hub axle of the front wheel and the rear wheel, the stand mounting portion is particularly fastened together. The tightening and tightening of the tightening nut on the rear wheel side is difficult.If the tightening is loose, the hub axle will shift and the running performance will worsen, and it will be dangerous.Excessive tightening will deform the stand mounting part and the mudguard stay. There are problems such as inviting.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned various problems in the prior art, reduces the number of parts to reduce the cost of manufacturing and assembling, and reduces the weight and the design. In addition to improving the performance, it also provides ample room for undercarriage when getting on and off, eliminating the risk of falling over, and improving the fixing function of the hub nut by the tightening nut. A frame supporting the rear wheel and the front wheel and its operating handle via a head lug at the front, and further including a drive means for the rear wheel at an intermediate portion, wherein the rear portion of the frame is a rear wheel of the rear wheel. It has a rear curved chassis that has a seat post mounting part on the upper surface along the outer peripheral surface and a rear wheel bearing part that supports the rear wheel axle in the middle and both ends are At least 4 near the bearing portion as a starting point
The present invention relates to a bicycle frame including a pair of left and right rear fixing arms integrally fixed to the rear curved chassis by opening an angle of 0 to 160 degrees.

Further, according to the present invention, a rear wheel is provided at a rear portion, and a head lug is provided at a front portion. The front wheel and an operation handle thereof are supported via the head lug, and a driving means for the rear wheel is mounted at an intermediate portion. The rear portion of the frame has a rear curved chassis along the outer peripheral surface of the rear wheel and has a seat post mounting portion on the upper surface, and a bearing portion for supporting the rear wheel axle in the middle and both ends. , At least 40 degrees or more starting from near the rear wheel bearing
It consists of a pair of left and right rear fixing arms integrally fixed to the rear bending chassis with an angle of 60 degrees or less, and furthermore, the front head lug is curved along the outer peripheral surface of the front wheel and the upper surface is inside the head lug. A front curved chassis to which a stem to be mounted is attached, and a front wheel bearing portion that supports a front wheel axle in the middle and both ends are opened at an angle of at least 40 degrees or more and 160 degrees or less starting from the vicinity of the front wheel bearing portion. The present invention also relates to a bicycle frame in which a front wheel unit including a pair of left and right front fixed arms integrally fixed to a front curved chassis is rotatably mounted.

Further, the present invention provides an intermediate chassis to which a driving means for the rear wheel is mounted, a rear curved chassis for supporting the rear wheel integrally fixed to a rear end of the intermediate chassis, and an intermediate chassis. The front curved chassis supports a front wheel that is rotatably mounted via a head lug at the front end.The rear curved chassis is curved along the outer peripheral surface of the rear wheel and has a seat post mounting portion on the upper surface. In addition, on the lower surface side, there is a rear wheel bearing portion for supporting the rear wheel axle in the middle, and at least an angle of 40 degrees or more and 160 degrees or less from the vicinity of the rear wheel bearing portion as an opening, and one end to the intermediate chassis, The front curved chassis has a pair of left and right rear fixed arms, the other ends of which are integrally fixed to the rear part of the rear curved chassis. Along allowed to curved, yet is attached to stem charged into Heddoragu on the upper surface, a lower surface side has a front wheel bearing unit for supporting the wheel shaft in the middle,
At least 40 degrees or more 160
The present invention also relates to a bicycle frame having a pair of left and right front fixing arms having both ends fixed integrally to the front curved chassis at an angle of not more than degrees.

Further, the present invention relates to a bicycle frame configured so that the rear fixed arm and the front fixed arm have a vertical durability load of at least 150 kg for the former and 100 kg for the latter, respectively.

In the above construction, according to the first aspect of the present invention, the rear wheel axle supporting the rear wheel is supported and held by the rear wheel bearing portion which is attached to the rear curved chassis and is provided between the left and right rear fixed arms. Attach the rear wheel and attach the front wheel and handle to the front head lug,
Further, a hanger gear driving mechanism, which is a driving means for the rear wheel, is attached to the intermediate portion, an endless chain is hung between the hanger gear and the rear wheel gear of the rear wheel, and a seat post mounting portion formed on the upper surface of the rear wheel. Attach the seat to the bicycle to complete the bicycle and use it for actual driving. However, the load applied to the seat is transmitted to the rear curved chassis, the rear fixed arm, and the front wheels via the seat post.

According to the third aspect of the present invention, when the vehicle is running during rainfall, water droplets jumping up above the rear wheel are captured by the concavely curved surface of the rear curved chassis and scattered in the direction of the seat. Is blocked. Further, according to the fourth and fifth aspects of the present invention, in addition to the attachment of the rear wheel to the rear curved chassis as in the first aspect of the present invention, the front wheel is positioned between the left and right front fixed arms of the front wheel unit. At the same time, the front wheel is mounted by holding the front wheel on the left and right front wheel bearings in the middle, and the hanger gear drive mechanism, which is the driving means for the rear wheel, is mounted in the middle, and the hanger gear and the rear wheel gear of the rear wheel The bicycle is completed by suspending the endless chain between them and attaching the seat to the seat post attachment portion formed on the upper surface of the rear curved chassis.

However, the load applied to the seat is transmitted to the front and rear wheels by the rear curved chassis and the rear fixed arm and the front curved chassis and the front fixed arm via the seat post. Further, the invention according to claim 6 is characterized in that when traveling during rainfall, water droplets jumping up above the rear wheel and the front wheel are captured by the concavely curved curved surfaces of the rear curved chassis and the front curved chassis, and the seat seat and the handle direction Spattering is prevented.

Further, the invention of claim 7 and claim 8
The rear wheels are mounted on the rear wheel bearings of the left and right rear fixed arms in the rear curved chassis, and the front wheels are mounted on the front wheel bearings of the left and right front fixed arms in the front curved chassis where the head lugs are supported on the front end of the intermediate chassis. , Respectively, further attached a hanger gear drive mechanism as a driving means of the rear wheel to the intermediate chassis, hung an endless chain between the hanger gear and the rear wheel gear of the rear wheel, further formed on the upper surface of the rear curved chassis. Attach the seat to the seat post attachment part, and attach the handle to the head lug at the front end of the intermediate chassis to complete the bicycle,
Provide for actual driving. However, the load applied to the seat and the steering wheel is transmitted to the front and rear wheels by the rear curved chassis and the rear fixed arm via the seat post, and by the front curved chassis and the front fixed arm via the intermediate chassis.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the present invention will be described below with reference to the illustrated embodiment.
Represents an intermediate chassis, 9 represents a rear curved chassis, and 15 represents a front curved chassis. The intermediate chassis 1 is made of a pipe having a circular cross section or a hollow metal or a hollow or non-hollow hard synthetic resin material whose cross section is formed in an elliptical or square box shape. In consideration of easiness, it is preferable to configure the shape as “inverted shape” as shown in the figure or “substantially L shape”.

Further, the shape of the intermediate chassis 1 is not necessarily limited to the above-mentioned one, and may be, for example, a so-called triangular frame having an upper pipe and a lower pipe, or a bent main pipe. , And various conventional shapes can be employed. A known head lug 7 is integrally formed at the front end of the intermediate chassis 1, and a stay 2 protruding downward is provided at a lower portion near the base 8, and the stay 2 drives a rear wheel. A chain wheel 4 is rotatably mounted on the crankshaft 3.

In the figure, reference numeral 5 denotes a crank, and 6 denotes a pedal. The rear curved chassis 9 is curved along the outer peripheral surface of the rear wheel T1, has a mounting portion 10 for a seat post 10a on the upper surface, and has one end connected to the base 8 of the intermediate chassis 1 by welding or screwing. They are joined together by joining means. In addition, the above-mentioned seat post mounting portion 10 is configured to be hollow inside, and a seat post 10a having a seat seat 12 mounted on the upper end is slidably loaded in the hollow portion in the vertical direction.
A fastening key 11 is provided on the side surface.
Thus, the height position of the seat post 10a can be freely adjusted and fixed.

Further, on the lower surface side of the rear curved chassis 9,
A rear fixed arm 13 having sufficient strength to support the rear wheel T1 is attached. That is, the rear fixed arm 1
The left and right rear wheel bearings 1 are configured as a left and right pair so as to be parallel to each other with a certain interval therebetween so as to be located on both left and right side surfaces of the rear wheel T1.
4 and bent at least 40 degrees from the vicinity of the rear wheel bearing portion 14 as a starting point to be bent in the shape of a "<", one end of which is at the rear end portion 9a of the intermediate chassis 9 and the other end is at the intermediate position. Each is integrally fixed to the base 8 of the chassis 1.

In this case, the rear fixed arm 13
When the leg opening angle with respect to the rear curved chassis 9 is less than 40 degrees, sufficient strength as a bicycle frame cannot be obtained, so that it is necessary to set the angle to at least 40 degrees or more. However, if the angle exceeds 160 degrees, it is necessary to increase the rear fixing arm 13 to further increase the strength.
It is preferable to open the legs within the range of 0 to 160 degrees. Further, a rear wheel T1 and a free gear 20 are attached to a rear wheel bearing portion 14 of the rear fixed arm 13 by a rear wheel axle 19, and an endless chain 21 is provided between the free gear 20 and the chain wheel 4 described above. Be hung around.

Further, the front curved chassis 15 includes a front wheel T
2, a stem 16 to be inserted into the head lug 7 is attached to the upper surface, and a front fixed arm 17 having sufficient strength to support the front wheel T2 is attached to the lower surface. . That is, the front fixed arm 17 is configured as a pair of left and right sides so as to be parallel to each other with a certain interval therebetween so as to be located on both left and right side surfaces of the front wheel T2, and a front wheel bearing part that supports the front wheel shaft 22 in the middle. 18, having an angle of at least 40 degrees or more from the vicinity of the front wheel bearing portion 18 as a starting point, and bending in the shape of a "
Both ends are integrally fixed to the front end 15b and the rear end 15a of the front curved chassis 15, respectively.

In this case, the front fixed arm 17
The angle of the leg with respect to the front curved chassis 15 is 40 degrees as in the case of the rear fixed arm 13 described above.
If the angle is less than 40 degrees, sufficient strength as a bicycle frame for supporting the front wheel T2 cannot be obtained. Therefore, it is necessary to set the angle to at least 40 degrees as in the case of the rear fixed arm 13 described above. However, when the angle exceeds 160 degrees, the front fixing arm 17 must be thickened to further increase the strength. Therefore, the legs are opened within the range of 40 to 160 degrees in consideration of the demand for weight reduction and economical requirements. Is preferred.

Further, the rear curved chassis 9 and the front curved chassis 15 described above are completely different from the conventional simple mudguards. The rear curved chassis 9 supported by the rear fixed arm 13 and the front fixed arm The strength of the front curved chassis 15 supported by the support member 17 is such that it can support the weight of the occupant and the weight of the cargo, withstand the road impact caused by traveling, and can sufficiently secure the safety during traveling. The vertical endurance load weight of the entire frame must be at least 2
It is necessary to be 50 kg or more. Regarding the distribution of the weight of the front and rear wheels, since the load on the rear wheel side is rather large, the vertical endurance load weight of the rear curved chassis supported by the rear fixed arm 13 is at least one.
The vertical durability load of the front curved chassis 15 supported by the front fixed arm 17 is 50 kg or more.
It is necessary to configure so as to be not less than Kg.

In the above configuration, the rear wheel bearing portion 14 of the left and right rear fixed arms 13 in the rear curved chassis 9.
And the head lug 7 at the front end of the intermediate chassis 1.
, Which was supported via the front curved chassis 15,
The front wheels T2 are attached to the front wheel bearings 18 of the front fixed arm 17, respectively, and further, a drive mechanism such as a chain wheel 4 and a crank 5 as driving means for the rear wheels T1 is attached to the intermediate chassis 1, and the chain wheel 4 and the rear An endless chain 21 is hung between the free gear 20 on the wheel side, the seat 12 is mounted on a seat post mounting portion 10 formed on the upper surface of the rear curved chassis 9, and the head lug 7 provided on the front end of the intermediate chassis 1 is further mounted. The bicycle is completed by inserting and fixing the handle post 24 and attaching the handle 23, and the bicycle is actually used.

However, the seat 12 and the handle 2
The load applied to the occupant 3 by the rear curved chassis 9 and the rear fixed arm 13 via the seat post 10a and the front curved chassis 15 and the front fixed arm 17 via the intermediate chassis 1 by the front wheel T2 and the rear wheel T2, respectively. Wheel T1
Supported by.

[0024]

As described above, the present invention has a rear wheel at the rear,
Further, the front portion supports a front wheel and an operation handle thereof via a head lug, and furthermore, a middle portion is provided with an intermediate chassis or the like, so that a drive means for the rear wheel is attached to the frame. The rear portion of the frame has a rear curved chassis along the outer peripheral surface of the rear wheel and has a seat post mounting portion on the upper surface, and a rear wheel bearing portion for supporting the rear wheel axle at this portion, and both ends are near the rear wheel bearing portion. A pair of left and right rear fixed arms integrally fixed to the rear curved chassis by opening at least 40 degrees or more and 160 degrees or less from the starting point, and the rear wheel side rear curved chassis and the rear In addition to the configuration with the fixed arm, the front head lug has a stem that curves along the outer peripheral surface of the front wheel and has a stem inserted into the head lug on the upper surface Anterior curved chassis, and the both end portions and having a front wheel bearing unit for supporting the wheel shaft in the middle,
A case where a front wheel unit including a pair of left and right front fixed arms integrally fixed to the front curved chassis by opening an angle of at least 40 degrees or more and 160 degrees or less starting from the vicinity of the front wheel bearing portion is also rotatably mounted. In addition, the following functions and effects unique to the present invention are exhibited.

First, since the rear curved chassis and the front curved chassis also serve as a rear wheel mudguard or a front wheel mudguard, and as a result, there is no need for a separate mudguard stay. Incomplete tightening of the wheel axle (hub axle) and the front wheel axle can be prevented, and traveling safety can be further improved. Secondly, the number of parts, such as mudguards and mudguard stays, can be reduced to reduce costs during manufacturing and assembly. Third, the man-hours required in the bicycle production line can be reduced. Fourth, it is possible to improve productivity, and fourthly, it is possible to supply a bicycle having a simple appearance and excellent design.

[Brief description of the drawings]

FIG. 1 is a side view of a completed bicycle using a bicycle frame according to one embodiment of the present invention.

FIG. 2 is a partially enlarged view of a rear fixed arm portion viewed from a bottom surface side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intermediate chassis 2 Stay 3 Crank shaft 4 Chain wheel 5 Crank 6 Pedal 7 Head lug 8 Base 9 Rear curved chassis 9a Rear part 10 Seat post attaching part 10a Seat post 11 Fastening key 12 Seat seat 13 Rear fixed arm 14 Rear wheel bearing part 15 Front curved chassis 15a Rear end 15b Front end 16 Stem 17 Front fixed arm 18 Front wheel bearing 19 Rear wheel axle 20 Free gear 21 Chain 22 Front wheel axle 23 Handle 24 Handle post T1 Rear wheel T2 Front wheel

Claims (8)

[Claims] 1. A frame in which a rear wheel is supported on a rear portion, a front wheel and an operation handle thereof are supported on a front portion via a head lug, and a driving means for the rear wheel is mounted on an intermediate portion. The rear part of the frame has a rear curved chassis along the outer peripheral surface of the rear wheel and has a seat post mounting part on the upper surface, and a rear wheel bearing part that supports the rear wheel axle in the middle and both ends, the rear wheel bearing part A bicycle frame comprising a pair of left and right rear fixing arms integrally fixed to the rear curved chassis at an angle of at least 40 degrees and not more than 160 degrees starting from the vicinity. 2. A frame which supports a rear wheel at a rear portion, a front wheel and an operation handle thereof at a front portion via a head lug, and a drive means for the rear wheel is mounted at an intermediate portion. The rear part of the frame has a rear curved chassis along the outer peripheral surface of the rear wheel and has a seat post mounting part on the upper surface, and a rear wheel bearing part that supports the rear wheel axle in the middle and both ends, the rear wheel bearing part A pair of left and right rear fixing arms integrally fixed to the rear curved chassis by opening an angle of at least 40 degrees or more and 160 degrees or less from the vicinity thereof as a vertical endurance load at least 15
A bicycle frame characterized by being at least 0 kg. 3. The bicycle frame according to claim 1, wherein the rear curved chassis has a concave cross-sectional shape at a portion facing the outer peripheral surface of the rear wheel. 4. A frame supporting a rear wheel at a rear portion, a front wheel and an operation handle thereof via a head lug at a front portion, and a drive means for the rear wheel is mounted at an intermediate portion. The rear part of the frame has a rear curved chassis along the outer peripheral surface of the rear wheel and has a seat post mounting part on the upper surface, and a bearing part that supports the rear wheel axle in the middle and both ends, starting from the vicinity of the rear wheel bearing part A pair of left and right rear fixing arms integrally fixed to the rear bending chassis at an angle of at least 40 degrees or more and 160 degrees or less, and the front head lug is bent along the outer peripheral surface of the front wheel. A front curved chassis with a stem to be inserted into the head lug on the upper surface, and a front wheel bearing that supports the front wheel axle in the middle and both ends with front wheel bearings At least 40 degrees or more to the origin 16
A bicycle frame comprising a front wheel unit comprising a pair of left and right front fixed arms integrally fixed to the front curved chassis at an angle of 0 degree or less and rotatably mounted. 5. A frame which supports a rear wheel at a rear portion, a front wheel and an operation handle thereof via a head lug at a front portion, and a drive means for a rear wheel is mounted at an intermediate portion. The rear part of the frame has a rear curved chassis along the outer peripheral surface of the rear wheel and has a seat post mounting part on the upper surface, and a bearing part that supports the rear wheel axle in the middle and both ends, starting from the vicinity of the rear wheel bearing part A pair of left and right rear fixing arms integrally fixed to the rear curved chassis at an angle of at least 40 degrees or more and 160 degrees or less so that the vertical endurance load is at least 150 kg or more. The front curved chassis with the stem curved into the head lug on the top and curved along the outer peripheral surface of the front, and the front wheel axle in the middle That both ends and has a front wheel bearing unit, or at least 40 degrees around the front wheel bearing unit to a starting point 16
A bicycle comprising a pair of left and right front fixed arms which are integrally fixed to the front curved chassis with an angle of 0 ° or less opened and a front wheel unit having a vertical durability load of at least 100 kg or more is rotatably mounted. For frames. 6. The cross section of the rear curved chassis and the front curved chassis facing the outer peripheral surface of each of the rear wheel and the front wheel is concavely curved.
Or the bicycle frame according to claim 5. 7. An intermediate chassis to which a drive means for a rear wheel is mounted, a rear curved chassis for supporting a rear wheel, which is integrally fixed to a rear end of the intermediate chassis, and a front end of the intermediate chassis. It consists of a front curved chassis that supports the front wheel that can be rotatably mounted via a head lug, and the rear curved chassis is curved along the outer peripheral surface of the rear wheel and has a seat post mounting part on the upper surface, and On the lower surface side, there is a rear wheel bearing portion that supports the rear wheel shaft in the middle, and opens at least 40 degrees or more and 160 degrees or less from the vicinity of the rear wheel bearing portion, one end to the intermediate chassis, and the other end to the middle chassis. The rear curved chassis has a pair of left and right rear fixing arms integrally fixed to the rear part of the rear curved chassis, and the front curved chassis is curved along the outer peripheral surface of the front wheel. In addition, a stem to be inserted into the head lug is mounted on the upper surface, and a front wheel bearing portion for supporting the front wheel shaft is provided in the middle on the lower surface side, and at least 40 degrees or more and 160 degrees or less starting from the vicinity of the front wheel bearing portion. A bicycle frame characterized by having a pair of left and right front fixing arms in which both ends are opened and the both ends are integrally fixed to the front curved chassis. 8. An intermediate chassis to which driving means for the rear wheel is mounted, a rear curved chassis for supporting the rear wheel, which is integrally fixed to a rear end of the intermediate chassis, and a front end of the intermediate chassis. It consists of a front curved chassis that supports the front wheel that can be rotatably mounted via a head lug, and the rear curved chassis is curved along the outer peripheral surface of the rear wheel and has a seat post mounting part on the upper surface, and On the lower surface side, there is a rear wheel bearing portion that supports the rear wheel shaft in the middle, and opens at least 40 degrees or more and 160 degrees or less from the vicinity of the rear wheel bearing portion, one end to the intermediate chassis, and the other end to the middle chassis. The rear curved chassis has a pair of left and right rear fixing arms integrally fixed to the rear part of the rear curved chassis, and the front curved chassis is curved along the outer peripheral surface of the front wheel. In addition, a stem to be inserted into the head lug is mounted on the upper surface, and a front wheel bearing portion for supporting the front wheel shaft is provided in the middle on the lower surface side, and at least 40 degrees or more and 160 degrees or less starting from the vicinity of the front wheel bearing portion. It has a pair of left and right front fixed arms in which both ends are opened and the both ends are integrally fixed to the front curved chassis, and the vertical endurance loads of the rear curved chassis and the front curved chassis are each at least 150 kg or more. A bicycle frame characterized in that the latter weighs 100 kg or more.