US3799292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw-nut and nut follower-controlled lift apparatus and components
Assignee: Astro Dynamics Inc
•
Filing: 1972-01-05
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Granted: 1974-03-26
•
Expires: 1992-01-05
Abstract
Abstract This disclosure deals with novel screw and nut and nut follower mechanisms involving a plurality of in-line, resiliently mounted, independent nut segments adapted to follow long drive screws for such applications as controlling vehicular lifts and for more general uses, as well.
Inventors
- 👤 L Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2003; F16H25/2009; B; B66; B66F; B66F7/00; B66F7/02; B66F7/025; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
201 words
A screw and nut and nut-follower-controlled lift apparatus having, in combination, platform means for receiving an object to be raised and lowered; drive screw means provided with drive means for rotating the same in opposite directions; distributed nut and nut-follower means engaging the drive screw means and driven thereby upward and downward therealong; and means for connecting the distributed nut and nut follower means to support the platform means and to carry the same therewith along the drive screw means; the distributed nut and nut follower means comprising a nut housing containing a bore, a plurality of similar independent threaded nut segments, each having several thread turns discontinuous from the turns of the others, distributed longitudinally at successively closely spaced regions within the bore and receiving and threadedly engaging corresponding successive regions of said drive screw means, each nut segment being mounted upon the nut housing and transmitting platform load forces therefrom through the nut segment to said drive screw means in cooperation with the other nut segments, each nut segment having external resilient insert means between its outer surface and the bore to enable independent selfadjustment and alignment with the corresponding successive adjacent regions of the engaged drive screw means.
Claim 2
Dependent Claim
201 words
A screw and nut and nut-follower-controlled lift apparatus having, in combination, platform means for receiving an object to be raised and lowered; drive screw means provided with drive means for rotating the same in opposite directions; distributed nut and nut-follower means engaging the drive screw means and driven thereby upward and downward therealong; and means for connecting the distributed nut and nut follower means to support the platform means and to carry the same therewith along the drive screw means; the distributed nut and nut follower means comprising a nut housing containing a bore, a plurality of similar independent threaded nut segments, each having several thread turns discontinuous from the turns of the others, distributed longitudinally at successively closely spaced regions within the bore and receiving and threadedly engaging corresponding successive regions of said drive screw means, each nut segment being mounted upon the nut housing and transmitting platform load forces therefrom through the nut segment to said drive screw means in cooperation with the other nut segments, each nut segment having external resilient insert means between its outer surface and the bore to enable independent selfadjustment and alignment with the corresponding successive adjacent regions of the engaged drive screw means.
Claim 3
Dependent Claim
58 words
A screw and nut and nut-follower-controlled lift as claimed in claim 1 and in which the connecting means comprises wheeled carriage means secured to the said nut housing and movable along flange means disposed along and substantially parallel to said drive screw means, said carriage means being provided with outwardly extending supporting beams for supporting said platform means.
Claim 4
Dependent Claim
62 words
A screw and nut and nut-follower-controlled lift as claimed in claim 2 and in which said flange means comprises a pair of rearward flange edges and a front surface, saiD carriage means comprising a pair of members spaced on opposite sides of said nut housing with wheels thereof riding on the rearward flange edges and roller means riding on said front surface.
Claim 5
Dependent Claim
46 words
A screw and nut and nut-follower-controlled lift as claimed in claim 3 and in which said carriage means is connected to said nut housing by gimbal-like tension rod means depending from said nut housing to transmit lifting force from the nut housing to said carriage means.
Claim 6
Dependent Claim
45 words
A screw and nut and nut-follower-controlled lift as claimed in claim 1 and in which said housing comprises two mating members with semi-cylindrical portions of said bore and each nut segment comprises a pair of mating semi-cylindrical half-nut segments with corresponding semi-cylindrical resilient insert means.
Claim 7
Dependent Claim
36 words
A screw and nut and nut-follower-controlled lift as claimed in claim 1 and in which the nut segments are longitudinally separated along the bore by ribs of greater diameter than the threads of the nut segments.
Claim 8
Dependent Claim
25 words
A screw and nut and nut-follower-controlled lift as claimed in claim 1 and in which each nut segment has two substantially complete adjacent thread turns.
Claim 9
Dependent Claim
29 words
A screw and nut and nut-follower-controlled lift as claimed in claim 1 and in which said bore is provided with a further lubricant wiper segment beyond said nut segments.
Claim 10
Dependent Claim
94 words
A distributed nut and follower construction having, in combination, a nut housing containing a bore, a plurality of similar independent threaded nut segments, each having several thread turns discontinuous from the turns of the other, distributed longitudinally at successively closely spaced regions within the bore,means mounting each nut segment upon said housing for transmitting load forces from said housing to the threads of the nut segment in co-operation with the other nut segments, each nut segment having external resilient insert means between its outer surface and the bore to enable independent self-adjustment and alignment.
Claim 11
Dependent Claim
94 words
A distributed nut and follower construction having, in combination, a nut housing containing a bore, a plurality of similar independent threaded nut segments, each having several thread turns discontinuous from the turns of the other, distributed longitudinally at successively closely spaced regions within the bore,means mounting each nut segment upon said housing for transmitting load forces from said housing to the threads of the nut segment in co-operation with the other nut segments, each nut segment having external resilient insert means between its outer surface and the bore to enable independent self-adjustment and alignment.
Claim 12
Dependent Claim
44 words
A distributed nut and follower construction as claimed in claim 9 and in which the housing comprises two mating members with semi-cylindrical portions of said bore and each nut segment comprises a pair of mating semi-cylindrical half-nut segments with corresponding semi-cylindrical resilient insert means.
Claim 13
Dependent Claim
35 words
A distributed nut and follower construction as claimed in claim 9 and in which the nut segments are longitudinally separated along the bore by ribs of greater diameter than the threads of the nut segments.
Claim 14
Dependent Claim
24 words
A distributed nut and follower construction as claimed in claim 9 and in which each nut segment has two substantially complete adjacent thread turns.
Claim 15
Dependent Claim
28 words
A distributed nut and follower construction as claimed in claim 9 and in which said bore is provided with a further lubricant wiper segment beyond said nut segments.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |