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A linear actuator includes a motor having a rotatable output shaft, a lead screw having a worm gear thread, a forward end and a rear end, a worm gear drive train connected between the motor output shaft and the lead screw to convert the rotary motion of the motor output shaft into rotary motion of t

A linear actuator includes a motor having a rotatable output shaft, a lead screw having a worm gear thread, a forward end and a rear end, a worm gear drive train connected between the motor output shaft and the lead screw to convert the rotary motion of the motor output shaft into rotary motion of the lead screw, an extension tube assembly mounted at the forward end of the lead screw, where the extension tube assembly includes an extension tube concentrically disposed around the forward end of the lead screw, the extension tube having a forward end for contacting a device requiring linear motion, and a rear end, a nut connected to the rear end of the extension tube and threadedly mounted on the lead screw so that rotation of the lead screw moves the nut and the extension tube assembly axially along the lead screw, and a mounting adapter positioned at the rear end of the lead screw for rotatably mounting the lead screw and for attaching the linear actuator to a support structure.

대표청구항 ▼

[ What is claimed is:] [1.] A linear actuator comprising:a motor having a rotatable output shaft;a lead screw having a worm gear thread, a forward end and a rear end;a worm gear drive train connected between said motor output shaft and said lead screw for supporting said lead screw and for convertin

[ What is claimed is:] [1.] A linear actuator comprising:a motor having a rotatable output shaft;a lead screw having a worm gear thread, a forward end and a rear end;a worm gear drive train connected between said motor output shaft and said lead screw for supporting said lead screw and for converting the rotary motion of said motor output shaft into rotary motion of said lead screw;an extension tube assembly mounted at the forward end of said lead screw, said extension tube assembly comprising an extension tube concentrically disposed around the forward end of said lead screw and having a forward end and a rear end, said extension tube assembly further comprising a nut connected to the rear end of said extension tube and threadedly mounted on said lead screw so that rotation of said lead screw causes said nut and said extension tube assembly to move in an axial direction along said lead screw;a front adapter mounted at the forward end of said extension tube assembly for contacting a device requiring linear motion;an end stop disposed within said extension tube for supporting the forward end of said lead screw; anda mounting adapter positioned at the rear end of said lead screw for rotatably mounting said lead screw and for attaching said linear actuator to a support structure,wherein axial forces exerted on said lead screw are contained along a center line of said lead screw and resolved at said front adapter and said mounting adapter.