US3736799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual range manual preset timer
Assignee: Deltrol Corp
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Filing: 1971-10-26
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Granted: 1973-06-05
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Expires: 1991-10-26
Abstract
Abstract A dual range manual preset timer drives through the first part of its timing range at relatively high speed to give short timings of relatively high accuracy. It drives through the second part of its timing range to low speed to give long timings where high accuracy is not required. The low speed timing gears are always in mesh to insure against hang up. The high speed gear engages at the change over point in the timing range and drives from this point to the off position. A one way drive on the low speed timing gears permits the faster rotation by the high speed gears.
Inventors
- 👤 J Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:09
CPC Classifications
G; G04; G04F; G04F3/00; G04F3/06; Y; Y10; Y10T; Y10T74/00; Y10T74/11; Y10T74/114; Y10T74/115
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
240 words
In a dual range manual preset timing mechanism, the combination of, a control device, a timing shaft, means for actuating said control device from one position to another when the timing shaft is moved to a predetermined position and for actuating the control device back to the first position when the timing shaft is moved away from said predetermind position, drive means including a slow speed timing mechanism and a motor for driving said timing shaft in one direction towards said predetermined position, said slow speed mechanism including one way drive means providing a positive drive for said shaft in said one direction at all times while allowing free movement of said shaft in said one direction at a rate faster than caused by the slow speed mechanism, means including a high speed drive mechanism driven by said motor for also driving said shaft in said one direction and at a speed higher then caused by the slow speed drive mechanism, slip friction drive means associated the said shaft for allowing manual setting movement thereof in either direction irrespective of both the high speed and low speed drive means, means for disengaging the high speed drive means when the shaft is turned manually from a high speed timing range into a low speed timing reange, and for reengaging said high speed drive means when the low speed drive means drives the cam shaft back to the low speed timing range.
Claim 2
Dependent Claim
240 words
In a dual range manual preset timing mechanism, the combination of, a control device, a timing shaft, means for actuating said control device from one position to another when the timing shaft is moved to a predetermined position and for actuating the control device back to the first position when the timing shaft is moved away from said predetermind position, drive means including a slow speed timing mechanism and a motor for driving said timing shaft in one direction towards said predetermined position, said slow speed mechanism including one way drive means providing a positive drive for said shaft in said one direction at all times while allowing free movement of said shaft in said one direction at a rate faster than caused by the slow speed mechanism, means including a high speed drive mechanism driven by said motor for also driving said shaft in said one direction and at a speed higher then caused by the slow speed drive mechanism, slip friction drive means associated the said shaft for allowing manual setting movement thereof in either direction irrespective of both the high speed and low speed drive means, means for disengaging the high speed drive means when the shaft is turned manually from a high speed timing range into a low speed timing reange, and for reengaging said high speed drive means when the low speed drive means drives the cam shaft back to the low speed timing range.
Claim 3
Dependent Claim
48 words
The combination recited in claim 1 in which the means for disengaging the high speed drive means and the means for reengaging the same includes a lost motion cam carried by the timing shaft and a cam follower riding the cam and controlling the high speed drive means.
References Cited (Backward Citations)
US3077784A
Cited
US3180157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |