Back to results
US 4,580,997 AGranted
Two speed sprocket shift assembly
AssigneeBicycle Partnership #1
InventorsBruce W. Browning, Christopher M. Browning
Life of this patent
Estimating the term…
Abstract
A two speed sprocket and chain shift assembly with one sprocket having a small pivoted sprocket segment and means for shifting the chain from one sprocket to another upon pivoting of the sprocket segment and with the chain being entrained on one sprocket when an operating means is activated and entrained on the other sprocket when the operating means is released.
Claims31
In a sprocket shift assembly having
- a large sprocket;
- a smaller sprocket;
- a chain arranged to engage each of said sprockets;
- and
- shifting means to shift the chain from one of said sprockets to the other, the improvement comprising
- a pivotable segment of at least one of said sprockets;
- a pawl connected to said pivotable segment;
- cam means including channel means through which the pawl is travelled;
- and
- control means to position the cam means for engagement by the pawl and to thereby position the pivoted segment.
7 more elements
In a sprocket shift assembly having
- a large sprocket;
- a smaller sprocket;
- a chain arranged to engage each of said sprockets;
- and
- shifting means to shift the chain from one of said sprockets to the other, the improvement comprising
- a pivotable segment of at least one of said sprockets;
- a pawl connected to said pivotable segment;
- cam means including channel means through which the pawl is travelled;
- and
- control means including means for providing a memory of chain position, to position the cam means for engagement by the pawl.
7 more elements
In a sprocket shift assembly having
- a large sprocket;
- a smaller sprocket;
- a chain arranged to engage each of said sprockets;
- and
- shifting means to shift the chain from one of said sprockets to the other, the improvement comprising
- a pivotable segment of at least one of said sprockets, said segment being pivotable between runs of the chain, whereby the pivotable segment is movable without load thereon.
3 more elements
In a sprocket shift assembly having
- a large sprocket;
- a smaller sprocket;
- a chain arranged to engage each of said sprockets;
- and
- shifting means to shift the chain from one of said sprockets to the other, the improvement comprising
- a pivotable segment of at least one of said sprockets, said segment including a guide surface for directing the chain therealong onto the other sprocket.
3 more elements
Dependencies are inferred from the claim text.