Electric actuators
AssigneeWestinghouse Brake & Signal Co. Ltd.
InventorsJack Washbourn, Howard F. Cogan
Life of this patent
Estimating the term…
Abstract
An electric actuator having an electric motor operable to control the output force generated by a spring system of the actuator on an output member of the actuator; measuring means responsive to a characteristic of the spring system which is indicative of the value of the output force; and an electrical circuit by which operation of the electric motor can be initiated and can be terminated when the measuring means detects the characteristic as being indicative of the output force of a required value.
Claims7
An electric actuator comprising an electric motor for controlling the output force generated by a spring system of the actuator on an output member of the actuator;
- measuring means responsive to the length of a spring of the spring system and comprising two parts, one of said parts carrying a series of switches for controlling the operation of the electric motor, and the other of said parts carrying a cam for sequentially operating said switches;
- and an electrical circuit for initiating the operation of the electric motor and for, responsive to said measuring means, terminating the operation of said electric motor when the measuring means detects a length of said spring as being indicative of the output force being of a required value.
Dependencies are inferred from the claim text.