Lead screw for linear actuator, and method of manufacturing...

Details Lead screw for linear actuator, and method of manufacturing... Lead screw for linear actuator, and method of manufacturing...

2006-04-11

2006-04-11

Ridley, Richard W. (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S089230, C074S424710, C264S328100, C264S328120, C029S527200, C029S527400, C029S530000

Reexamination Certificate

active

07024957

ABSTRACT:
A lead screw for a linear actuator, which has a metal pipe having a helical projection resin-molded on its outer surface, and a ball for a pivot bearing welded to a distal end of the metal pipe, is disclosed together with a method of manufacturing the same. With the lead screw according to this invention, a slight positional deviation from the origin, which is caused at a high ambient temperature by thermal expansion of a resin material filled up in the metal pipe, can be prevented reliably. Linear movement upon rotation of a stepping motor can take place with high precision.

REFERENCES:
patent: 3161447 (1964-12-01), Larsson
patent: 5133125 (1992-07-01), Diebels et al.
patent: 5533247 (1996-07-01), Ishii et al.

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