US3703835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for taking up slack in lead screw devices
Assignee: OCONNOR CHARLES A
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Filing: 1970-08-27
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Granted: 1972-11-28
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Expires: 1990-08-27
Abstract
Abstract A spaced double nut combination mounted upon a lead screw and coupled to a movable table for reducing the nut backlash to zero. The two nuts are rotatably linked to each other by a spring loaded rockable yoke. The yoke acts to move the nuts to eliminate backlash on the lead screw. Binding action between the nut combination and the lead screw is prevented by the differential frictional contact between the nuts and the screw.
Inventors
- 👤 Charles A O'connor
- 👤 Richard J Maehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:08
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2003; F16H25/2006; F16H2025/2012; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/304536; Y10T409/304592; Y10T74/00; Y10T74/19; Y10T74/1987; Y10T74/19893; Y10T74/19898; Y10T74/19902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A back lash take up device for a lead screw driven apparatus comprising a rotatable lead screw, a first and a second nut threaded upon said lead screw in spaced relationship, a laterally movable member adjacent the lead screw disposed between the first and second nuts in lateral contact therewith, a swingable yoke carried by the movable member and positively coupled to each of said nuts and spring means to swing the yoke whereby the first and second nuts are rotated and urged against the movable member.
Claim 2
Dependent Claim
87 words
A back lash take up device for a lead screw driven apparatus comprising a rotatable lead screw, a first and a second nut threaded upon said lead screw in spaced relationship, a laterally movable member adjacent the lead screw disposed between the first and second nuts in lateral contact therewith, a swingable yoke carried by the movable member and positively coupled to each of said nuts and spring means to swing the yoke whereby the first and second nuts are rotated and urged against the movable member.
Claim 3
Dependent Claim
32 words
A device according to claim 1 in which each of said first and second nuts is provided with outwardly extending studs and the yoke is slotted to receive the said studs therein.
Claim 4
Dependent Claim
20 words
A device according to claim 1 in which the laterally movable member is ring shaped and surrounds the lead screw.
Claim 5
Dependent Claim
22 words
A device according to claim 1 in which thrust bearings are disposed between the movable member and the first and second nuts.
Claim 6
Dependent Claim
24 words
A device according to claim 1 in which the swing of the yoke is limited by a stop carried by the laterally movable member.
Claim 7
Dependent Claim
24 words
A device according to claim 1 in which the spring means is a coil spring under tension between the yoke and the movable member.
Claim 8
Dependent Claim
34 words
A device according to claim 1 in which the spring means is a spring loaded rod assembly yieldably coupled at one end to the yoke and at its other end to the movable member.
Claim 9
Dependent Claim
109 words
A device according to claim 7 in which the spring loaded rod assembly comprises an elongated rod, a fitting carried by the rod and freely coupled to the yoke, a one way clutch means carried by the rod spaced from the fitting, a first coil spring under compression disposed around the rod between the fitting and clutch means, a sleeve overlying a portion of the free end of the rod and the clutch means, an arm carried by the movable member and adapted to freely receive the sleeve therethrough and a second coil spring under compression disposed around the sleeve and supported between the sleeve and the arm member.
Claim 10
Dependent Claim
22 words
A device according to claim 8 in which the sleeve is rockably and freely supported by a plate carried by the arm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |