US3631731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull transmissions
Assignee: Bowden Controls Ltd
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Filing: 1970-04-03
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Granted: 1972-01-04
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Expires: 1990-04-03
Abstract
Abstract A push-pull transmission of the type in which a central strip is longitudinally displaceable between two rows of caged rolling elements, e.g., balls, arranged to roll on outer tracks in a conduit by longitudinal displacement of the strip, the feature being that the conduit is contracted after assembling the transmission to take up tolerances and ensure contact of the rolling elements with the strip and the outer tracks. Contraction may be such as to preload the balls, i.e., subject them to some radial pressure. The conduit may be contracted substantially uniformly over its whole length, such as progressively by rotary swaging.
Inventors
- 👤 George Hawtree
- 👤 Edgar Hoyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:24
CPC Classifications
F; F16; F16C; F16C1/00; F16C1/10; F16C1/20; F16C1/26; F16C1/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49641; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/20444
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
In a pUsh-pull transmission having a central strip, plural rows of caged rolling elements supporting said strip on each side a conduit containing said strip and rolling elements, said conduit including tracks mounted on the inner surface thereof for engaging said rolling elements in rolling contact so that said strip is longitudinally displaceable between the rows of rolling elements, the improvement comprising that said conduit has been contracted after assembly of the transmission to ensure rolling contact of the rolling elements with the strip and the outer track.
Claim 2
Dependent Claim
88 words
In a pUsh-pull transmission having a central strip, plural rows of caged rolling elements supporting said strip on each side a conduit containing said strip and rolling elements, said conduit including tracks mounted on the inner surface thereof for engaging said rolling elements in rolling contact so that said strip is longitudinally displaceable between the rows of rolling elements, the improvement comprising that said conduit has been contracted after assembly of the transmission to ensure rolling contact of the rolling elements with the strip and the outer track.
Claim 3
Independent Claim
75 words
A method of increasing the efficiency of a push-pull transmission of the type in which a central strip element is longitudinally displaceable between two rows of caged rolling elements arranged to roll on outer track elements within a conduit, which comprises the step of contracting the conduit around the said elements after they have been assembled in the conduit in order to ensure contact of all the rolling elements with the strip and track elements.
Claim 4
Independent Claim
75 words
A method of increasing the efficiency of a push-pull transmission of the type in which a central strip element is longitudinally displaceable between two rows of caged rolling elements arranged to roll on outer track elements within a conduit, which comprises the step of contracting the conduit around the said elements after they have been assembled in the conduit in order to ensure contact of all the rolling elements with the strip and track elements.
Claim 5
Independent Claim
62 words
The method of increasing the efficiency of a push-pull transmission of the type in which a central strip is longitudinally displaceable between two rows of caged rolling elements arranged to roll on outer tracks in a conduit, in which, after assembly of the transmission, the conduit is externally swaged to ensure contact between the rolling elements and the strip and the tracks.
Claim 6
Independent Claim
62 words
The method of increasing the efficiency of a push-pull transmission of the type in which a central strip is longitudinally displaceable between two rows of caged rolling elements arranged to roll on outer tracks in a conduit, in which, after assembly of the transmission, the conduit is externally swaged to ensure contact between the rolling elements and the strip and the tracks.
Claim 7
Dependent Claim
26 words
The method according to claim 3 in which the conduit is swaged substantially throughout its length surrounding the rolling elements by a progressive rotary swaging action.
Claim 8
Dependent Claim
21 words
The method according to claim 3 in which the conduit is swaged to produce a radial preload on the rolling elements.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |