JPS605989U - bicycle crank - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の一体型の自転車用クランクを示す一部縦
断正面図、第２図は先考案に係る自転車用クランクの一
部縦断正面図、第３〜４図は先考案の側倒を示しており
、第３図は中央部の、第４図は端部のそれぞれ一部縦断
面図、第５〜７図は本考案の実施例を示しており、第５
図は円筒の部分断面図、第６図は支持板の斜視図、第７
図は組立てた状態を両端を省略して示す一部縦断正面図
である。 １：ボトムブラケット、２：ベアリング、３：クランク
軸部、４ａ、　　４ｂ：クランク腕部、５：大ギヤ、６
：中心孔、７：突出杆、８：孔、９：雄ねじ部、１０：
玉押、１１．　１１ａ、　　１１ｂ：円筒、１２：外向
フランジ、１３：ねじ孔、１４ニブラケツト、１５：円
孔、１６：円筒面部、１７：支持板、１８：短円筒部、
１９：円孔。　　　　゛ 、−１７− ＋Ｉ　ｎ ？、７−−’１ 第５図　　　、　　　　　第６し 　　ｒ 第２図　　　　　Ｄ ４ド １１９ ４夜 ・　　　７１印 １７ １＋−Fig. 1 is a partially longitudinal front view showing a conventional integrated bicycle crank, Fig. 2 is a partially longitudinal front view of a bicycle crank according to an earlier invention, and Figs. 3 and 4 are side views of an earlier invention. FIG. 3 is a partial vertical cross-sectional view of the central portion, FIG. 4 is a partial vertical cross-sectional view of the end portion, and FIGS. 5 to 7 show embodiments of the present invention.
The figure is a partial sectional view of the cylinder, Figure 6 is a perspective view of the support plate, and Figure 7 is a partial cross-sectional view of the cylinder.
The figure is a partially longitudinal front view showing the assembled state with both ends omitted. 1: Bottom bracket, 2: Bearing, 3: Crankshaft, 4a, 4b: Crank arm, 5: Large gear, 6
: Center hole, 7: Protruding rod, 8: Hole, 9: Male thread, 10:
Ball push, 11. 11a, 11b: cylinder, 12: outward flange, 13: screw hole, 14 nib bracket, 15: circular hole, 16: cylindrical surface part, 17: support plate, 18: short cylindrical part,
19: Circular hole.゛, -17- +I n ? , 7--'1 Figure 5, 6th r Figure 2 D 4 do 119 4 nights 71 mark 17 1+-

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 金属丸材をクランク型に折曲げて、中間のクランク軸部
とこのクランク軸部の両端から互いに反対方向に折曲っ
たクランク腕部とを一体に形成し、上記クランク軸部に
外周面に雄ねじを有する円筒を外嵌し溶接固定して、こ
のクランク軸部の両端に玉押を装着するための雄ねじ部
を設けた自転車用クランクに於いて、上記円筒の一端に
支持板を固着し、この支持板の内側面には、円孔の周囲
を囲み自転車用クランクに装着する大ギヤの中心孔に内
嵌できる端口筒部と、この大ギヤの中心から外れた位置
に穿設した孔に内嵌できる突出杆とを形成したことを特
徴とする自転車用クランク。A metal round material is bent into a crank shape, an intermediate crankshaft part and crank arm parts bent in opposite directions from both ends of this crankshaft part are integrally formed, and a male thread is provided on the outer peripheral surface of the crankshaft part. In a bicycle crank in which a cylinder having a cylinder is fitted onto the outside and fixed by welding, and a male screw part is provided at both ends of the crankshaft part for attaching a cone, a support plate is fixed to one end of the cylinder, and this support plate is fixed to one end of the cylinder. The inner surface of the plate has an end tube that surrounds the circular hole and can be fitted into the center hole of a large gear attached to a bicycle crank, and an end tube that can be fitted into a hole drilled at a position away from the center of the large gear. A bicycle crank characterized by forming a protruding rod.