US3703810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control apparatus
Assignee: Rawson Control Systems Inc
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Filing: 1970-10-14
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Granted: 1972-11-28
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Expires: 1990-10-14
Abstract
Abstract A control apparatus for synchronizing the speed of a rotating member with a variable speed input or for producing angular displacement of an output shaft in response to an input signal. The apparatus achieves correlation between the input and output by the use of a mechanical gear arrangement between the input and output shafts which arrangement produces angular displacement of a control member upon receipt of an input pulse or up variation of the speed of the input shaft from the output shaft. This displacement is then utilized to regulate an electrical speed control device, the flow to a hydraulic actuator, or a mechanical variable speed drive which adjusts the speed or displacement of the output shaft accordingly.
Inventors
- 👤 James L Rawson
- 👤 Leslie E Rawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:20
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F16H61/47
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
In combination with a hydraulic motor having an output shaft and valve means having a movable operator regulating the fluid flow to and from said hydraulic motor to thereby control the rotation of said output shaft, a speed control apparatus for correlating the rotation of said shaft with that of a rotatable member, said apparatus comprising, a first circular member rotatable about an axis and operatively connected to said rotatable member, a second circular member rotatable about an axis and operatively connected so as to be rotatable with said first circular member, the axes of rotation of said first and second circular members being movable, a circular resolving member rotatable about an axis fixed in relation to said rotatable member, said resolving member being engageable with said second circular member and operatively connected to said output shaft so as to be rotatable in proportion to rotation of said shaft, and operating means pivotally mounted about an axis colinear with the fixed axis of said resolving member, said operating means being operatively connected to the axes of said first and second circular members so as to move said axes in a circular path about said pivotal axis when said means pivots, the operation of said valve means being directly mechanically connected to said operating means and operable by pivotal movement of said operating means to control the rotative movement of said output shaft.
Claim 2
Dependent Claim
232 words
In combination with a hydraulic motor having an output shaft and valve means having a movable operator regulating the fluid flow to and from said hydraulic motor to thereby control the rotation of said output shaft, a speed control apparatus for correlating the rotation of said shaft with that of a rotatable member, said apparatus comprising, a first circular member rotatable about an axis and operatively connected to said rotatable member, a second circular member rotatable about an axis and operatively connected so as to be rotatable with said first circular member, the axes of rotation of said first and second circular members being movable, a circular resolving member rotatable about an axis fixed in relation to said rotatable member, said resolving member being engageable with said second circular member and operatively connected to said output shaft so as to be rotatable in proportion to rotation of said shaft, and operating means pivotally mounted about an axis colinear with the fixed axis of said resolving member, said operating means being operatively connected to the axes of said first and second circular members so as to move said axes in a circular path about said pivotal axis when said means pivots, the operation of said valve means being directly mechanically connected to said operating means and operable by pivotal movement of said operating means to control the rotative movement of said output shaft.
Claim 3
Dependent Claim
51 words
The combination of claim 1 in which said first and second circular members and said resolving member are gears, and said operating means includes a control arm pivotally mounted at one end thereof, the other end of said arm being connected to the axes of said first and second circular members.
Claim 4
Dependent Claim
94 words
The combination of claim 2 in which said output shaft is operatively connected to said resolving gear by a third gear, and the face width of said resolving gear is greater than the combined face widths of said second and third gears, said second and third gears having the same pitch diameter, and said second gear engages said resolving gear aLong one edge thereof and said third gear engages said resolving gear along the other edge thereof so that said second gear can revolve completely around said resolving gear as said control arm pivots.
Claim 5
Dependent Claim
32 words
The combination of claim 3 in which there is provided indicator means actuated by pivotal movement of said control arm beyond a predetermined amount to indicate an abnormal condition in said apparatus.
Claim 6
Dependent Claim
38 words
The combination of claim 3 in which said first and second gears are affixed to and rotatable with the same shaft, and said shaft is turnable within the end of said control arm opposite to its pivotal end.
Claim 7
Dependent Claim
32 words
The combination of claim 5 in which said control arm is secured to and turnable with a shaft having a fixed axis, and said resolving gear is rotatably mounted on said shaft.
Claim 8
Dependent Claim
21 words
The combination of claim 6 in which the shaft of said control arm is directly mechanically connected to said control means.
Claim 9
Dependent Claim
39 words
The combination of claim 7 in which the operator of said valve means is a spool directly connected to and movable by said operating means, said spool also being connected to said output shaft through said speed control apparatus.
Claim 10
Dependent Claim
39 words
The combination of claim 1 in which the operator of said valve means is a spool directly connected to and movable by said operating means, said spool also being connected to said output shaft through said speed control apparatus.
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 |