B - Operations – Transporting – 62 – M
Patent
B - Operations, Transporting
62
M
B62M 9/08 (2006.01) F16H 9/10 (2006.01) F16H 9/24 (2006.01) F16H 55/30 (2006.01) F16H 55/54 (2006.01)
Patent
CA 2305881
The evolution in the sphere of bicycle transmission is scant. From the beginning of the single speed driving spocket - driven spocket - and chain combination, the nearly one hundred year old Sturmey-Archer and the "derailleur" type of 1922 are the only transmission innovations to be accepted by the buying customer. The single speed transmission is evidently limited to flat or nearly flat country operation. The Sturmey-Archer planetary system, in the driven wheel hub, is limited to three and five speed ratios, limiting its hilly country operation. The "derailleur" type, using banks of ordinary sprocket gears on the driving and driven ends has a good range of available ratios. However, it suffers from, A/ sharp misalignment of the driving chain in some of the chosen ratios, resulting in the chain skipping engagement and creating shocks, B/ required frequent maintenance of the cable operating system, lack of which may also creates the aforementioned problem. Furthermore, study of all the available ratios on the "derailler" type of transmission shows that, only approximately half of the available ratios, when combining multiple gears in driving and driven wheel assemblies, generate a gradually usable range of speed and torque application. Another study, through observation of ordinary cyclist rallyes involving thousands of participants, showed an average of eighty per cent of competitors using the wrong ratio, leg muscles overworked or, uselessly revolving legs, pointing to the need of a simpler and better performing mechanical system. Study of available submissions on innovating transmission systems ( excepting the three already mentioned ) with manual operation or automatic changing of ratios, revealed some or all of the following shortcomings : cost of installed unit incompatible with normal bicycle retail prices - complicated mechanical and fragile elements - weather sensitive - complicated maintenance and repairs. The following specification, on the submitted variable speed transmission, addresses these desirable qualities, cited by priorities : fabrication cost and retail price compatible with the cheapest selling bicycles - simple mechanical parts and assemblies - easily repaired - maintenance-free - fully automatic and weatherproof.
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