TW200400896A - Bicycle frame with improved mechanical strength - Google Patents

Abstract

A bicycle frame (1) comprises a plurality of tube pieces (2, 3, 4, 7, 8) presenting a saddle tube (2), tubes (7, 8) defining a rear fork unit (5) and tubes (3, 4) connected to a head tube (10), a bottom bracket shell (15) being provided to house known members connected to pedals. At least one of said tube pieces (2, 3, 4, 7, 8) comprises at least one end portion (2A, 3A, 4A, 7A, 8A) of circular cross-section and at least one portion (2B, 3B, 4B, 7B, 8B) of elliptical cross-section, said portion of elliptical cross-section (2B, 3B, 4B, 7B, 8B) having transverse dimensions greater than those of the end portion of circular cross-section (2A, 3A, 4A, 7A, 8A), said at least one tube piece (2, 3, 4, 7, 8) being in one piece.

Description

200400896 (1) Description of the invention: (1) the technical field to which the invention belongs The present invention relates to a bicycle frame according to the preamble of the scope of the main application for a patent. (2) Prior technology Conventionally, the bicycle frame includes a plurality of interconnected pipe parts (although all the pipe parts form a component or a frame). In particular, the bicycle frame includes _ there is a seat fitting (seat fitting), a rear fork unit with upper and lower forks (the upper and lower forks are connected to the usual bottom bracket shell and are mounted under the seat f seat pipe) ), And two fittings that stop inside the head pipe and one is connected to the seat pipe and the other is connected to the bottom bracket shell. (3) Summary of content Generally, these hollow and formed pipes by the most different methods can be made of metal or composite materials such as carbon fiber. It is an object of the present invention to provide a bicycle frame that can exhibit high mechanical strength and at the same time can completely absorb the impact received by the bicycle when the bicycle is moved, thereby preventing the impact from being directly transferred to the user of the bicycle. # These and other purposes, familiar with this technology, can be achieved by attaching a bicycle frame to the scope of the patent application. (4) Application method Referring to the drawing, the entire bicycle frame is represented by symbol 1. It includes a plurality of pipe members 2, 3, 4 and a rear fork unit 5, which has a pair of pipe members 7 and 8 forming the lower fork and the upper fork of the rear fork unit 5. The rear fork unit 5 supports a bicycle rear wheel (not shown). 200400896 In detail, the pipe fitting 2 is a seat pipe, and the pipe fittings 3 and 4 are pipes having first ends 3A, 4A connected to the head pipe 10, and second ends 3B, 4B connected to the seat pipe 2. The pipe member 3 has one end fixed to a conventional bottom bracket housing 15 to which a conventional foot pedal spindle (not shown) is attached. Similarly, a first end 7A, 8A of each of the pipe members 7 and 8 of the rear fork unit 5 is connected with a component 18 'which can be connected to a spindle (not shown) of the rear wheel of the bicycle.

Each tube member 7 has a second end 7B connected to the bottom bracket shell 15 and the second end 8B of each tube member 8 is fixed to the seat tube 2. According to the invention, at least one of the tubes of the bicycle frame 1 is enclosed in one element (ie, it includes at least one outer one-piece sleeve or sheath, even if its interior contains at least one end, a metal insert Pieces), and shows a shape of a variable cross section, having at least a first end of a circular cross section and at least a portion of an oval cross section. The latter has a larger lateral dimension than the circular portion. Due to this shape, the pipe has greater mechanical stress resistance. More specifically, in one embodiment of the present invention, at least each pipe member 7 of the lower fork # of the rear fork unit 5 has the end 7B of the circular cross section and the end 7A of the circular cross section. The pipe 7 also has a widened or "split" inner portion 17 (which is located between the ends 7A and 7B) 'which splits to form a (central) perforation 21 and the sides are formed by opposing arms 22 connected by the ends 23 'The arms are linked into a single piece. In this way, the widened or split portion 17 shows a large side surface 'and can make the pipe 7 more resistant to stress, and can absorb the impact of the bicycle -6-.D ^ 200400896 A considerable degree of stress and prevent it from being transmitted directly to the user on the bicycle. The portion 17 may have a circular, oval or flat cross section in its entirety on at least two opposite side edges. According to a different embodiment of the frame 1, each pipe member 8 has a different opening shape, which has at least the end 8A having a circular cross section and the end 8B having an oval circular cross section. Furthermore, it is advantageous that the pipe member 8 also shows a "split" middle portion 2 4 'which has a central perforation 25 formed by an arm 26 similar to the arm 22 described above. Since these embodiments of the frame, 'the side surface of each pipe member 7 or 8 is increased', can better absorb the impact which may be transferred to the user's back, it can increase the comfort when using the bicycle. At least one of the pipe fittings 2, 3, and 4 according to the modified form of Fig. 4 also shows the shape of each pipe fitting 7 (having a different cross section). In particular, the tubes 2, 3, or 4 are single pieces and include a first end with a cross section in a 圚 shape (for example, the end 2A near the seat and 3A or 4A near the head pipe 10) and a second end in an oval cross section (close The end 2B of the bottom bracket shell 15; 3B or 4B). As shown in the figure, the pipe fittings 2, 3 or 4 may also include a split part 2K, 3K, 4K, which forms part 17 or 24 of the pipe fitting 7 or 8. According to Fig. 5, at least one of the pipe members 3, 4 or 7 shows a split portion corresponding to the end 3A, 4A or 7B. This split portion is substantially fork-shaped and includes diffusion elements 40 and 50 'which can connect the pipe provided with the half-split or fork to an adjacent pipe. In all of the illustrated embodiments, 'each tube is a single piece as described above. 200400896 Thanks to the invention, a bicycle can obtain a certain comfort and mechanical stress resistance, which is better than that of a conventional bicycle user. ί τ) A simple explanation of the present invention is made more obvious by the embodiments of the drawings, wherein: FIG. 1 is a side view of the first embodiment of the present invention; FIG. 2 is an enlarged view of the frame of FIG. 1 Figure 3 is a partial perspective view of the frame of Figures 1 and 2; Figure 4 is a side view of a second embodiment of the present invention;

Fig. 5 is a side view of a third embodiment of the present invention. Component symbol description

1 Bicycle frame 2, 3, 4 Fittings 7, 8 Fittings 5 Rear fork unit 3A. 4A First end 3B, 4B Shishandi one W 15 Bottom bracket shell 10 Head tube 7A, 8A First end 7B, 8B No. 2 ends 18 element 17 inner part / widening part 21 perforation 23 end 200400896 22 arm 24 middle part / widening 25 central perforation 26 arm 2K, 3K, 4K split part / widening part part

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Claims (1)

200400896 Patent application scope: 1. A bicycle frame (1), which includes a plurality of pipe fittings (2, 3, 4, 7, 8), including: a seat pipe (2); pipe fittings (7, 8 ) Forming a fork unit (5); and the pipe fittings (3, 4) are connected to a head pipe (10); a bottom bracket shell (1 5) is provided for accommodating the conventional components connected to the foot pedal, It is characterized in that one or more of the pipe fittings (2, 3, 4, 7, 8) include at least one first end portion (2A, 3A, 4A, 7A, 8A) with a circular cross section and an oval cross section At least one part of the cross section (2B, 3B, 4B, 7B, 8B), the lateral dimension of the part of the oval cross section (26, 36, 46, 78, 88) is larger than the end of the circular cross section (2A, 3A, 4A, 7A, 8A) are larger, and the at least one pipe fitting (2, 3, 4, 7, 8) is a single piece. 2. For example, the bicycle frame of the scope of patent application, wherein the part of the oval cross section is at least the second end (2B, 3B, 4B, 7B) of the pipe (2, 3, 4, 7, 8) , 8B). 3. The bicycle frame according to item 1 of the scope of patent application, wherein the part of the oval cross section (2B, 3B, 4B, 7B, 8B) is directly connected to the circular cross section (28, 3, 4, 4) (8, 74, 8)) the first end. 4. The bicycle frame according to item 1 of the scope of patent application, wherein the pipe member having a circular portion and an oval portion forms part of the rear fork unit (5) of the frame (1). 5. The bicycle frame according to item 4 of the scope of patent application, wherein the pipe fitting is a pipe fitting (7) connected to the lower fork of the rear fork unit (5) of the bottom bracket housing (15). 6. The bicycle frame according to item 4 of the patent application scope, wherein the pipe fitting is a pipe fitting (8) on the fork of the rear fork unit (5). 7. The bicycle frame according to item 1 of the scope of patent application, wherein the pipe fittings having a circular portion 200400896 and an oval portion are seat tubes. 8. The bicycle frame according to item 1 of the scope of patent application, wherein the pipe fittings having a circular portion and an oval-shaped portion are one of the pipe fittings (3, 4). 9. The bicycle frame according to item 1 of the scope of the patent application, wherein the pipe member having a circular portion and an oval portion includes an increased lateral dimension or widened portion (17, 24, 2K, 3K, 4K). 10. The bicycle frame according to item 9 of the scope of patent application, wherein the widened portion (17, 24, 2K, 3K, 4K) is the pipe fitting (2, 3,4,7,8) between the ends (2A, 2B, 3A, 3B, 4A, 4B, 7A, 7B). 1 1. The bicycle frame according to the scope of patent application No. 10, wherein the widened portion includes a perforation (2 1) formed by opposed arms (22) connected together at opposite ends (23) ), Wherein the opposing ends are combined into a single piece. 1 2. If the bicycle frame of item 10 in the scope of patent application, the widened part (17, 24, 25, 31 (, 4) is a circular cross section. 1 3. If the scope of patent application is 1 The bicycle frame of item 〇, wherein the widened portion (17, 24, 21 (, 31 (, 41 ()) is an oval cross section as a whole. 1 4 · If the bicycle frame of item 10 of the patent application scope, The widened portion (17,24,2 〖, 31 (, 41〇) is a flat cross section. 1 5 · For the bicycle frame of item 9 of the patent application scope, wherein the widened portion is located in a circle with a circle. One end of the pipe part of both the shape part and the ellipse part. 1 6 · As for the bicycle frame of the scope of patent application No. 丨 5, the widened part is substantially fork-shaped and includes a diffusing element (40,50) , Which can connect the pipe to the adjacent pipe.