Leadscrew mechanical drive with differential leadscrew...

Details Leadscrew mechanical drive with differential leadscrew... Leadscrew mechanical drive with differential leadscrew...

2005-08-23

2005-08-23

Fenstermacher, David M. (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S089420, C074S441000, C074S424770

Reexamination Certificate

active

06931960

ABSTRACT:
A leadscrew mechanical drive includes a leadscrew having a leadscrew axis and a leadscrew thread with a nonzero leadscrew thread pitch. A leadscrew follower structure preferably having two leadscrew followers is engaged to the leadscrew. Each leadscrew follower includes a threaded insert having an insert thread with a nonzero insert thread pitch different front the leadscrew thread pitch. The insert thread is engaged to the leadscrew thread over a circumferential distance of less than one-half turn of the insert thread. Each leadscrew follower further includes a bearing in which the threaded insert is received and which permits the threaded insert to rotate about an insert axis that is inclined to the leadscrew axis by an angle θ for the first leadscrew follower and −θ for the second leadscrew follower, and a bearing support in which the bearing is received. A preload structure biases each of the leadscrew followers against the leadscrew.

REFERENCES:
patent: 2482082 (1949-09-01), Wahlberg
patent: 3614900 (1971-10-01), Wehlmark
patent: 4794810 (1989-01-01), Parsons
patent: 5533417 (1996-07-01), Devenyi
patent: 5636549 (1997-06-01), Devenyi
patent: 5732597 (1998-03-01), Devenyi
patent: 5857383 (1999-01-01), Devenyi

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