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US 4,882,945 AGranted
Pedal extension device
OwnerJose Trevizoinventor
Life of this patent
Estimating the term…
Abstract
A simple improved rotary to linear motion mechanism for increasing the pedal leverage on a bicycle using a telescoping pedal support arm and a rotating crank-disc engaging a coupling connecting rod to convert the rotary motion of the pedal to linear extension of the pedal support arm.
Claims2
A crankshaft pedal arm assembly for increasing the length of a bicycle pedal support arm as a function of the rotary position of a drive sprocket wherein the improvement comprises:
- (a), the pedal support arms terminating in telescopically attached bearing hub;
- (b), a crank-disc with a first radially spaced crank-pin attached to an end of a pedal axel;
- (c), a connecting rod engaging said first crank-pin in the crank-disc rotatably connected to a second crank-pin mounted on the pedal support arm;
- (d), rotation of the crank-disc drives the connecting-rod which introduces reciprocating movement of the bearing hub sliding on a telescopic rod;
- and,
- (e), a protective covering fastened to the bearing hub extends over the crank shaft-pedal arm assembly.
3 more elements
Dependencies are inferred from the claim text.