Bicycle transmission
OwnerFernand S. Lapeyreinventor
Life of this patent
Estimating the term…
Abstract
A multi-speed bicycle transmission located at the drive pedal hub and including a drive pedal actuatable shifting assembly for effecting gear change in response to limited reverse rotation of the drive pedal shaft at a pair of predetermined locations in the path of rotative displacement thereof. The drive pedal responsive shifting assembly further includes a slidable collar on the drive pedal shaft having two pairs of selectively contoured camming means thereon that are engageable by radially displaceable shift pin means extending into the pedal hub to effect longitudinal displacement of said collar on said collar on the drive pedal shaft and accompanying shifting of the gears in response thereto.
Claims19
In a pedal displacement actuable multi-speed transmission for bicycles, comprising
- a pedal shaft rotatably displaceable within the pedal shaft hub of a bicycle frame,
- gear means adapted for selected driving engagement with said pedal shaft,
- a collar member mounted on said pedal shaft for rotation in conjunction therewith and permitted longitudinal displacement therealong,
- camming means disposed on the surface of said collar member,
- shift control means disposed within said pedal shaft hub, displaceable radially of said pedal shaft and operatively engageable with said camming means in response to a predetermined arc of reverse rotative displacement of said pedal shaft for displacing said collar member longitudinally of said pedal shaft for effecting the selected connection of said gear means into driving engagement with said pedal shaft.
A pedal displacement actuable multi-speed transmission for bicycles, comprising
- a pedal shaft rotatably displaceable within the pedal shaft hub of a bicycle frame,
- a plurality of drive gears rotatably mounted on said pedal shaft,
- a change gear disposed in meshed engagement with each of said drive gears, each of said change gears being mounted for conjoint rotation on a common shaft,
- means for connecting each of said drive gears into selective driving engagement with said pedal shaft,
- a pin member extending inwardly of said pedal shaft hub,
- collar means having recessed camming channel means on the surface thereof mounted on said pedal shaft for rotation in conjunction therewith and permitted longitudinal displacement therealong,
- said recessed camming channel means being operatively engageable with said pin member in response to a predetermined arc of reverse rotative displacement of said pedal shaft for displacing said collar means longitudinally thereof, and
- means responsive to the positional location of said collar means longitudinally of said pedal shaft for effecting the selected connection of said drive gears into driving engagement with said pedal shaft.
A pedal displacement actuable multi-speed transmission for bicycles, comprising
- a cyclindrical pedal shaft hub having a tubular bicycle frame member terminally mounted thereon,
- a pedal shaft rotatably displaceable within said pedal shaft hub,
- a plurality of drive gears rotatably mounted on said pedal shaft,
- means for connecting each of said drive gears into selective driving engagement with said pedal shaft,
- a plug member mounted in said tubular frame member at the junction thereof with said pedal shaft hub,
- collar means mounted on said pedal shaft for rotation in conjunction therewith and permitted longitudinal displacement therealong,
- a displaceable shift pin mounted in said plug member biased into compressive engagement with the surface of said collar member,
- recessed camming channel means on the surface of said collar means and operatively engageable with said shift pin in response to a predetermined arc of reverse rotative displacement of said pedal shaft for displacing said collar means longitudinally thereof, and
- means responsive to the positional location of said collar means longitudinally of said pedal shaft for effecting the selected connection of said drive gears into driving engagement with said pedal shaft.
In a multi speed transmission for bicycles
- a drive shaft rotatably displaceable in response to pedal displacement,
- a collar member having selectively contoured camming means on the outer surface thereof mounted on said pedal shaft for rotation in conjunction therewith and permitted longitudinal displacement therealong,
- shift pin means engageable with said contoured camming means and selectively responsive to a predetermined arc of reverse rotative displacement of said drive shaft for displacing said collar means longitudinally thereof.
Dependencies are inferred from the claim text.