| 摘要 |
The cycle transmission has the driving force applied to the pedals 108 transmitted to the rear wheel 110 via three independent drive transmission loops in series. The forward most drive transmission loop from the pedals 108 is a ribbed belt 100 with toothed pulleys 103, 104, the subsequent drive transmission loops being chains 101, 102 with wheels 105-7, 109. The belt and chain drives have adjacent end pulleys/wheels on the same axles so as to provide coupled transmission of the applied driving force. Appropriate adjustable mountings are provided for these axles enabling convenient adjustment of belt and chain tension. The rearmost wheel 109 and an intermediate wheel 107 have plural rings for gear ratio variation. A frame 119, with a rear pivoting section, has two parallel rectangular cross-section elongate members defining a channel for adjustable location of the transmission. A slidably adjustable seat has a movable rear portion with back and head rests and an upwardly extending front portion of impact absorbing material with a tunnel profile to accept adjustment of a narrower front part of the rear portion. |
