Patent US3902575A successfully refreshed from Google Patents.
US3902575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective braking means for precision mechanisms
Assignee: CRC Evans Pipeline International Inc
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Filing: 1974-04-01
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Granted: 1975-09-02
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Expires: 1994-04-01
Abstract
Abstract For retarding or locking precision adjusting screws or placing a braking torque or drag on other rotatable parts within a housing, a resilient tough resinous brake or drag element slidably located in a bore in the outer member is forced by an adjustable screw into radial contact with a relatively movable inner part. Thus, the retarding or holding means for a threaded micrometer screw is formed of tough plastic material with threads which match and engage the screw threads effectively to clean them while also protecting them against moisture, grit, etc. For non-threaded rotating parts, the retarding or brake shoe means conforms accurately to the surface and is held in broad area contact therewith by an adjustable screw plug in the bore which contains the brake element. A stiff coiled compression spring between a slidable brake shoe element and the screw plug which bears on it assures continued braking effect and compensates for wear. A precision screw for adjusting a part laterally includes a spherical end mounted in bearings and under resilient pressure for preventing backlash. Such micrometer type adjusting devices may be used for various purposes.
Inventors
- 👤 Jerome William Nelson
- 👤 James Bennett Randolph
- 👤 Robert Earl Pollock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:22
CPC Classifications
B; B23; B23K; B23K37/00; B23K37/04; B23K37/053; F; F16; F16D; F16D63/00; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32631; Y10T403/32737; Y10T403/32762; Y10T403/32811; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/2066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
In a machine which comprises an adjusting screw mount, a machine part relatively movable with respect to said mount, a rotatable precision adjusting screw threaded through said mount and comprising an elongated shaft having a turning head on one end, a ball element on the other end, and multiple groove elements around said shaft intermediate its ends, said elements being disposed with said mount, and a play-free socket in the machine part snugly engaging said ball element, whereby turning of said screw about the shaft axis effects relative movement between said mount and the machine part, the combination which comprises a pair of opposed bores in said mount located to intersect the shaft at said grooved elements, a deformable plug freely slidable in each of said bores and formed of tough, resilient plastic material which will conform under pressure to intimately fit into said groove elements to effect cleaning of said groove elements when the shaft is turned and effectively brake the shaft against inadvertent turning after adjustment has been made, a compression spring behind each plug and a set screw threaded into the bore behind each spring to apply said groovecleaning and braking action to each of said plugs.
Claim 2
Dependent Claim
200 words
In a machine which comprises an adjusting screw mount, a machine part relatively movable with respect to said mount, a rotatable precision adjusting screw threaded through said mount and comprising an elongated shaft having a turning head on one end, a ball element on the other end, and multiple groove elements around said shaft intermediate its ends, said elements being disposed with said mount, and a play-free socket in the machine part snugly engaging said ball element, whereby turning of said screw about the shaft axis effects relative movement between said mount and the machine part, the combination which comprises a pair of opposed bores in said mount located to intersect the shaft at said grooved elements, a deformable plug freely slidable in each of said bores and formed of tough, resilient plastic material which will conform under pressure to intimately fit into said groove elements to effect cleaning of said groove elements when the shaft is turned and effectively brake the shaft against inadvertent turning after adjustment has been made, a compression spring behind each plug and a set screw threaded into the bore behind each spring to apply said groovecleaning and braking action to each of said plugs.
Claim 3
Dependent Claim
20 words
A combination according to claim 1 in which the grooved elements are part of the screw threads on said shaft.
Claim 4
Dependent Claim
53 words
A device according to claim 1 which comprises a threaded micrometer screw mounted in a shiftable member and bearing at its free end the ball element, and bearing means embracing said ball portion, and an elastic diaphragm member engaging said ball opposite said bearing means for eliminating play or backlash of said ball.
Claim 5
Dependent Claim
65 words
A device according to claim 1 in which the socket comprises a split bearing surrounding said ball portion, means for confining said split bearing around said ball portion, resilient diaphragm means engaging an opposite part of said ball portion for holding said ball portion firmly engaged in said split bearing, said screw being mounted for pivotal movement with respect to said ball portion to shift.
Claim 6
Dependent Claim
27 words
A device according to claim 1 in which the elastic brake element intimately engages said grooves in said shaft at oblique angles to enhance its braking action.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |