Transmission mechanisms
AssigneeRolls-Royce Motors Limited
InventorFrederick James Hawksworth
Life of this patent
Estimating the term…
Abstract
A windscreen wiper transmission mechanism comprises a driving wheel with a shaft eccentrically positioned on the wheel. A connecting link for connecting the mechanism to a member for driving a corresponding wiper blade, an eccentric bearing and a rotor are mounted on the shaft. A roller, complementary apertures in the eccentric bearing and rotor and a complementary recess in the link enable the eccentric bearing and link to be connected positively together so that the link can be positively driven from a position corresponding to a park position to a position corresponding to a wipe position of the wiper blade and the rotor and eccentric bearing to be positively connected together to allow repeated oscillation of the link in the wipe position.
Claims6
A transmission mechanism comprising a reversible motor, a driving member rotatably driven from the motor, a rotor member non-rotatable with respect to and eccentrically mounted on the driving member and arranged to rotate therewith, a further member eccentrically mounted with respect to and selectively rotatable with respect to the rotor member, and output member operatively supported by and selectively rotatable relative to said further member, a first means, automatically operable when said motor is driving in a reverse direction of rotation and said output member is in one position, to provide a positive mechanical connection between the rotor member and the further member, said first means being biased to its operative position, and a second means automatically operable, when said motor is driving in a forward direction of rotation and said output member is in another position, to provide a positive mechanical connection between the further member and the output member, said second means being also employed firstly, when the direction of rotation of the motor is changed from reverse to forward rotation, so as to enable the rotor member to carry the further member to its correct position for the second means of positive mechanical connection to take place, and secondly, when the direction of the motor is changed from forward to reverse rotation, so as to hold the further member to the output member until such time as the rotor member is moved to the position where it can be engaged by the first means of positive mechanical connection.
Dependencies are inferred from the claim text.