Quick release camming mechanism
AssigneeCrank Brothers, Inc.
InventorsCarl Winefordner, Frank Hermansen
Life of this patent
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Abstract
A quick release camming mechanism is used in a bicycle skewer that secures a hub to a fork. Whereas prior art quick release mechanisms have only a single lever, this mechanism has two independent levers. About half the force is required to independently push either lever closed as to push both levers closed simultaneously. Similarly, about half the force is required to open either lever individually as to open them simultaneously. A similar quick release camming mechanism also works well for a quick release seat post clamp with similar advantages. The present invention is not limited to use on bicycle components.
Claims25
In a camming lever device wherein a lever terminating in a cam surface is attached to a pin to selectively bear against a movable member with a force depending upon the elevational position of the lever;
- an improved lever comprising:
- a plurality of lever sections, each such section being independently elevatable about said pin to form a plurality of fractional cam surfaces, each said lever section fractional cam surface bearing against a portion of said movable member and requiring only a fraction of the torque required to elevate all of said lever sections simultaneously.
A camming lever device comprising a plurality of lever sections each being independently elevatable about a common axis to form a plurality of fractional cam surfaces which cooperate to bear against a movable member with a force depending upon the elevational position of each such lever section;
- each such lever section requiring only a fraction of the torque required to elevate all of said lever sections simultaneously.
A camming lever device comprising a plurality of lever sections each terminating in a cam surface to bear against a receiving member with a force depending upon the rotational position of each said lever, said levers being independently rotatable to form a plurality of fractional cam surfaces, each said lever section requiring only a fraction of the torque required to rotate all of said lever sections simultaneously.
A camming lever device comprising a plurality of lever sections each having a cam surface to bear against a receiving member with a force depending upon the rotational position of each said lever, said levers being independently rotatable to form a plurality of fractional cam surfaces, each said lever section requiring only a fraction of the torque required to rotate all of said lever sections simultaneously.
Dependencies are inferred from the claim text.