Brake operating device for a bicycle
AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Life of this patent
Estimating the term…
Abstract
A brake operating device for a bicycle is provided with a main lever, a lever shaft to support the main lever, a pivot shaft screwing with an axial end of the lever shaft, and an auxiliary lever supported to the pivot shaft. A locking unit is provided for preventing looseness of the pivot shaft with respect to the lever shaft. The locking means is provided with a coiled spring having a coil portion wound onto the outer periphery of a stem of the pivot shaft and a retaining end in continuation of the coil portion, and a retaining portion receiving therein the retaining end of coiled spring. When the pivot shaft is intended to unscrew, the coil portion of the coiled spring contracts in diameter to impede the rotation of the pivot shaft.
Claims7
A brake operating device for a bicycle comprising a bracket member having a lever shaft fixed to a handle;
- a main lever supported swingably to said lever shaft at said bracket member;
- a pivot shaft having a screw thread screwable with an axial end of said lever shaft, a stem and a head;
- and an auxiliary lever supported swingably to said pivot shaft;
- said brake operating device including a locking means for preventing said pivot shaft from loosening with respect to said lever shaft, said locking means comprising a coiled spring having a coil portion wound onto an outer periphery of said pivot shaft and a retaining end in continuation of said coil portion;
- and a retaining portion for receiving therein said retaining end of said coil portion;
- so that when said pivot shaft rotates in an unscrewing direction, said coil portion at said coiled spring contracts in diameter to impede rotation of said pivot shaft.
Dependencies are inferred from the claim text.