To provide a bicycle for travel training which has enhanced strength of a connection part, improved accuracy of production and assembly, and in which connection work can be simplified.SOLUTION: A body connection part 21 of a cart body 2 of a bicycle 1 for travel training is formed into a cylindrical shape which is a regular hexagonal shape in a plan view comprising: cylindrical surfaces 211 and 212 at both sides of a cross direction being a travel direction; a pair of penetration holes 21a and 21b for penetrating through bolts 4 formed on the cylindrical surfaces 211 and 212; and corners 21c which are formed by plastic working provided at both right and left sides. A unit connection part 34 of a pedal unit 3 is formed into a cylindrical shape corresponding to the body connection part 21 such as cylindrical surfaces 341 and 342 at both sides of the cross direction, penetration holes 34a and 34b, and a corner 34c, and when the unit connection part 34 is connected to the body connection part 21, twisting in the travel direction is prevented by the bolt 4, and twisting from a lateral direction is prevented by the corner 34c of the unit connection part 34 and the corner 21c of the body connection part 21, respectively.SELECTED DRAWING: Figure 3
【課題】接続箇所の強度が強化され、製造及び組立の精度が向上し、かつ接続作業を簡単に済ますことのできる走行練習用自転車を提供する。【解決手段】走行練習用自転車1の二輪車体2の本体接続部21を、進行方向である前後方向両側の柱面211,212を有し、この柱面211,212にボルト4に貫通される一対の貫通孔21a,21bを形成し及び、左右両側に塑性加工された角21cを形成した平面視正六角の柱形状とし、ペダルユニット3のユニット接続部34を、前後方向両側の柱面341,342、貫通孔34a,34b及び角34cなど本体接続部21に対応させた柱形状とし、本体接続部21にユニット接続部34を接続したとき、ボルト4によって進行方向の捩れを、ユニット接続部34の角34c及び本体接続部21の角21cによって左右方向からの捩れを、それぞれ防止する構造とする。【選択図】図3
BICYCLE FOR TRAVEL TRAINING
走行練習用自転車
2020-03-05
Patent
Electronic Resource
Japanese