Patent US3593829A successfully refreshed from Google Patents.
US3593829A
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Mechanical stop limit means for lead screw-driven ram
Assignee: Collins Radio Co
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Filing: 1970-04-03
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Granted: 1971-07-20
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Expires: 1990-04-03
Abstract
Abstract A positive mechanical stop for position limits of a lead-screwdriven ram is provided by a ram-motion-actuated stop pawl which is pivoted to engageable relationship with a transverse stop pin carried on the lead screw. By stopping lead screw rotation to effect the ram position limits, high frictional forces between the screw and ram, which might prevent backoff from the limit positions, are avoided.
Inventors
- 👤 Winston F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:35
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2015; G; G05; G05G; G05G5/00; G05G5/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
213 words
Mechanical stop means for a lead-screw-driven ram member, said lead screw being rotatable by motor drive means, said ram member being in threaded engagement with said lead screw member and constrained from rotation with respect to said lead screw member, stop pin means affixed to said lead screw member and extending transversely from the rotational axis thereof, pivotable stop pawl means, a first portion of said pawl means being positionable into an engageable position with said stop pin means with said pawl in a first position, a second portion of said pawl comprising cam-following surfaces, said ram member having formed thereon a camming surface comprising an intermediate surface parallel to the rotational axis of said ram and first and second terminating camming surfaces for cooperative engagement with said cam-following surfaces on said pawl, spring means urging the cam-following surfaces of said pawl member into engagement with the camming surfaces on said ram member, whereby a predetermined displacement of said ram member is permitted between first and second position limits defined by the respective engagements of said pawl cam follower surfaces with a cooperating one of said camming surface terminations on said ram member which camming engagements effect a pivot of said pawl member into engageable relationship with said lead screw stop pin means.
Claim 2
Dependent Claim
213 words
Mechanical stop means for a lead-screw-driven ram member, said lead screw being rotatable by motor drive means, said ram member being in threaded engagement with said lead screw member and constrained from rotation with respect to said lead screw member, stop pin means affixed to said lead screw member and extending transversely from the rotational axis thereof, pivotable stop pawl means, a first portion of said pawl means being positionable into an engageable position with said stop pin means with said pawl in a first position, a second portion of said pawl comprising cam-following surfaces, said ram member having formed thereon a camming surface comprising an intermediate surface parallel to the rotational axis of said ram and first and second terminating camming surfaces for cooperative engagement with said cam-following surfaces on said pawl, spring means urging the cam-following surfaces of said pawl member into engagement with the camming surfaces on said ram member, whereby a predetermined displacement of said ram member is permitted between first and second position limits defined by the respective engagements of said pawl cam follower surfaces with a cooperating one of said camming surface terminations on said ram member which camming engagements effect a pivot of said pawl member into engageable relationship with said lead screw stop pin means.
Claim 3
Dependent Claim
113 words
Mechanical stop limit means for a lead-screw-driven ram member, said ram member being constrained from rotation with respect to said lead screw member, said lead screw member when rotated imparting an axial translation of said ram member, stop pin means extending transversely from said lead screw member, stopping pawl means having a first portion thereof selectively positionable into engageable orientation with respect to said stop pin means, said ram member carrying thereon a camming surface in camming engagement with said stop pawl means, said cam being fashioned to pivot said pawl for selectable engagement with said stop pin means as said ram member translates to either one of first and second limit positions.
Claim 4
Dependent Claim
113 words
Mechanical stop limit means for a lead-screw-driven ram member, said ram member being constrained from rotation with respect to said lead screw member, said lead screw member when rotated imparting an axial translation of said ram member, stop pin means extending transversely from said lead screw member, stopping pawl means having a first portion thereof selectively positionable into engageable orientation with respect to said stop pin means, said ram member carrying thereon a camming surface in camming engagement with said stop pawl means, said cam being fashioned to pivot said pawl for selectable engagement with said stop pin means as said ram member translates to either one of first and second limit positions.
Claim 5
Dependent Claim
44 words
Stop means as defined in claim 2 wherein said camming means is adapted to effect a pivot at said pawl means for stopping engagement with said stop pin in less than one revolution of said lead screw member with respect to said ram member.
Claim 6
Dependent Claim
59 words
Stop means as defined in claim 3 wherein said cam means comprises a flatted section of said ram member terminated in first and second inclined plane surfaces, said pawl means comprising an end member formed with first and second cooperating inclined surface cam-following means, and means for spring biasing said pawl end member with respect to said cam surface.
Claim 7
Dependent Claim
44 words
Stop means as defined in claim 1 wherein said camming means is adapted to effect a pivot at said pawl means for stopping engagement with said stop pin in less than one revolution of said lead screw member with respect to said ram member.
References Cited (Backward Citations)
US2979965A
Cited
US3326054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |