Linear Actuator
AssigneeLinak A/S
InventorHenning Kristensen
Life of this patent
Estimating the term…
Abstract
By a linear actuator of the type comprising a driven spindle with a spindle nut, the outer positions and possibly also the intermediate positions of the spindle nut can be determined by a specially designed switch construction. This switch comprises an elongated conductor (8a), and next to this at least one other short conductor (8b), and where a connection element (10) for the spindle nut is equipped with an electric conductive element (9), for creating contact between the two conductors (8a, 8b). With two short conductors at the end of the elongated conductor end-stop switches for the nut are achieved and with more short conductors between the two end conductors the position of the spindle nut between its outer positions can be determined.
Claims12
Linear actuator comprising a housing (5) containing a motor (2) with a motor shaft, a transmission (3) with an entrance side operatively connected to the motor shaft, a spindle (1) whose one end is operatively connected to an exit side of the transmission (3), a spindle nut (4) mounted on the spindle (1) and held against rotation, a circuit board (7) with control electronics, at least one switch for determination of a position of the spindle nut, wherein the switch is mounted on the circuit board (7) with control electronics and the switch is activated by a rigid or in all essentials rigid connection element (10) connected to the spindle nut (4) so that the connection element permanently follows the movement of the spindle nut.
Dependencies are inferred from the claim text.