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US 4,638,890 AGranted
Brake device for a cycle
AssigneeAB Trama
InventorOskar E. Lohman
Life of this patent
Estimating the term…
Abstract
The brakes of a bicycle are actuated in response to rotation of the pedal crank in a reverse direction. The brake actuating mechanism includes an actuating member which is connected to the pedal crank by a freewheel and a slip coupling. The freewheel is disengaged during forward rotation of the pedal crank, and it is engaged during reverse rotation of the pedal crank to move the actuating member and operate the brakes. During heavy braking, the slip coupling reduces the force exerted by the actuating mechanism on the brake operating cables. Movement of the actuating member also unblocks a freewheel which normally blocks reverse rotation of a driven wheel of the bicycle. This unblocking action prevents the pedals from locking after heavy braking.
Claims9
A system for braking at least one wheel of a cycle, comprising:
- brakes which are operable to brake the rotational movement of the wheel,
- actuating means for operating the brakes, said actuating means including a brake actuating member which is operatively connected to the brakes and is movable from an inactive position to an active position where it actuates the brakes of the cycle,
- a pedal crank assembly which is rotatable in a forward direction to drive the cycle and is rotatable in a reverse direction to move the brake actuating member to its active position to actuate the brakes,
- a freewheel means which connects the pedal crank assembly to the brake actuating member, said freewheel means being disengaged when the pedal crank assembly is driven in a forward direction and being engaged when the pedal crank assembly is driven in a reverse direction to move the brake actuating member to its active position,
- a slip coupling means connected to the freewheel means and, together with said freewheel means, connecting the pedal crank assembly to the brake actuating member, said slip coupling means being operable when the pedal crank assembly is forced in a rearward direction to reduce the force transmitted from the pedal crank assembly to the brake actuating member during heavy braking.
2 more elements
A system for braking at least one wheel of a cycle, comprising:
- brakes which are operable to brake the rotational movement of the wheel,
- actuating means for operating the brakes, said actuating means including a brake actuating member which is operatively connected to the brakes and is movable from an inactive position to an active position where it actuates the brakes of the cycle,
- a pedal crank assembly which is rotatable in a forward direction to drive the cycle and is rotatable in a reverse direction to move the brake actuating member to its active position to actuate the brakes,
- a freewheel means which connects the pedal crank assembly to the brake actuating member, said freewheel means being disengaged when the pedal crank assembly is driven in a forward direction and being engaged when the pedal crank assembly is driven in a reverse direction to move the brake actuating member to its active position,
- a slip coupling means connected to the freewheel means for reducing the force transmitted from the pedal crank assembly to the brake actuating member during heavy braking,
- said cycle having a driven wheel with a hub which has a second freewheel thereon, said second freewheel operating in a direction which is opposite to the freewheel means which connects the pedal crank assembly to the brake actuating member, said second freewheel having a blocking action for rotating the driven wheel in a forward direction in response to movement of said pedal crank assembly in a forward direction, and means for deactivating the second freewheel in response to movement of the brake actuating member to its active position, thereby releasing the driven wheel to prevent the pedal crank assembly from locking after heavy braking.
3 more elements
A system for braking at least one wheel of a cycle, comprising:
- brakes which are operable to brake the rotational movement of the wheel,
- actuating means for operating the brakes, said actuating means including a brake actuating member which is operatively connected to the brakes and is moveable from an inactive position to an active position where it actuates the brakes of the cycle,
- a pedal crank assembly which is rotatable in a forward direction to drive the cycle and is rotatable in a reverse direction to move the brake actuating member to its active position to actuate the brakes,
- a freewheel means which connects the pedal crank assembly to the brake actuating member, said freewheel means being disengaged when the pedal crank assembly is driven in a forward direction and being engaged when the pedal crank assembly is driven in a reverse direction to move the brake actuating member to its active position,
- a slip coupling means connected to the freewheel means for reducing the force transmitted from the pedal crank assembly to the brake actuating member during heavy braking,
- said freewheel means including a center portion, a sleeve which is rotatable on the center portion, said center portion and said sleeve having interengaging blocking means for providing a blocking action in only one direction, said sleeve having a flange which is engaged with said brake actuating member to deter rotation between the sleeve and the brake actuating member, and a spring for axially biasing together said flange and said brake actuating member.
3 more elements
Dependencies are inferred from the claim text.