Patent US3583253A successfully refreshed from Google Patents.
US3583253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuators
Assignee: English Electric Co Ltd
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Filing: 1969-06-02
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Granted: 1971-06-08
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Expires: 1989-06-02
Abstract
Abstract This invention relates to actuators of the kind including a drive motor coupled through reduction gearing to an output shaft. In the new layout provided by the invention, a worm shaft of the gearing lies parallel to the motor shaft and is driven by the motor via gear wheels which can be readily removed to enable gear wheels of different sizes to be fitted to provide different overall gear ratios. The gear wheels lie outside the casing of the actuator. The actuator has a flameproof spigot joint between the casing and a subsidiary housing mounted on the casing. The casing and the housing have flanges one of which has projections to provide gaps between the flanges into which a tool can be inserted to help in separating the housing from the casing.
Inventors
- 👤 Edward Michael Grimshaw
- 👤 Frederick William Stubbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:40
CPC Classifications
F; F16; F16H; F16H1/00; F16H1/02; F16H1/04; F16H1/12; F16H1/16; F16K; F16K31/00; F16K31/02; F16K31/04; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19642; Y10T74/19679; Y10T74/19698; Y10T74/19828
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
An actuator including a drive motor having a first shaft; a worm gear on a second shaft which is parallel to said first shaft; intermeshing first and second gear wheels on said first and second shafts respectively, said gear wheels being readily removable from the respective shafts to enable gear wheels of different sizes to be used for different overall gear ratios; an output shaft driven by said worm gear, wherein said second shaft includes a main portion and a tubular portion which are in driving engagement and which are arranged for relative axial sliding movement in either direction from a normal relative position in response to torque applied to said output shaft.
Claim 2
Dependent Claim
113 words
An actuator including a drive motor having a first shaft; a worm gear on a second shaft which is parallel to said first shaft; intermeshing first and second gear wheels on said first and second shafts respectively, said gear wheels being readily removable from the respective shafts to enable gear wheels of different sizes to be used for different overall gear ratios; an output shaft driven by said worm gear, wherein said second shaft includes a main portion and a tubular portion which are in driving engagement and which are arranged for relative axial sliding movement in either direction from a normal relative position in response to torque applied to said output shaft.
Claim 3
Dependent Claim
20 words
An actuator as claimed in claim 1, including a friction clutch connecting said second gear wheel to said second shaft.
Claim 4
Dependent Claim
35 words
An actuator as claimed in claim 2, in which the clutch includes a member attached to said second shaft and means to urge a face of said second gear wheel into contact with the member.
Claim 5
Dependent Claim
36 words
An actuator as claimed in claim 1, including resilient means which resists said axial sliding movement so that substantially no axial sliding movement occurs until a predetermined level of torque on said output shaft is reached.
Claim 6
Dependent Claim
41 words
An actuator as claimed in claim 1, in which the motor and the worm gear lie within a casing and said first and second shafts extend from the casing so that said first and second gear wheels lie outside the casing.
Claim 7
Dependent Claim
15 words
An actuator as claimed in claim 5, including a subsidiary housing mounted on the casing.
Claim 8
Dependent Claim
36 words
An actuator as claimed in claim 6, in which the housing and the casing have flanges for mounting the housing on the casing, one of which flanges has projections to space it from the other flange.
Claim 9
Dependent Claim
18 words
An actuator as claimed in claim 1, including means to indicate the angular position of the output shaft.
Claim 10
Dependent Claim
25 words
An actuator as claimed in claim 1, in which the output shaft carries a threaded member to engage a threaded spindle for controlling a valve.
References Cited (Backward Citations)
US1829249A
Cited
US2225957A
Cited
US3148556A
Cited
US3339426A
Cited
US3408880A
Cited
US3466945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |