US3699281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual preset interval timer with latch holding means for contacts
Assignee: Deltrol Corp
•
Filing: 1971-09-07
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Granted: 1972-10-17
•
Expires: 1991-09-07
Abstract
Abstract Slow or incomplete closure of manual preset interval timer contacts during the setting operation is avoided by a latch which prevents closure of the contacts until the timer knob has been turned far enough to insure complete closure of the contacts. This latch allows the contacts to assume very close proximity before releasing. This closes the contacts with a positive and rapid movement and avoids contact bounce.
Inventors
- 👤 John L Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:42
CPC Classifications
G; G04; G04F; G04F3/00; G04F3/02; G04F3/027; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18288
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
In a maNual preset interval timer, the combination of, a load switch comprising a relatively stationary contact and a relatively movable contact, means including cam follower means arranged to actuate the movable contact, a cam shaft having cam means arranged to actuate the cam follower means, timing means for driving the cam shaft, manual means for manually setting the cam shaft, said cam follower means and cam means being constructed and arranged to cause separation of the movable contact from the stationary contact with rapid action at a predetermined position of the cam shaft, and to cause the movable contact to engage the stationary contact when the cam shaft is away from said position, latch means movable into latching position when the contacts are separated for holding the contacts separated, and means on the cam shaft for releasing said latch means as the cam shaft is manually moved away from said predetermined position causing the contacts to engage with rapid action independent of the speed at which the cam shaft is manually set.
Claim 2
Dependent Claim
173 words
In a maNual preset interval timer, the combination of, a load switch comprising a relatively stationary contact and a relatively movable contact, means including cam follower means arranged to actuate the movable contact, a cam shaft having cam means arranged to actuate the cam follower means, timing means for driving the cam shaft, manual means for manually setting the cam shaft, said cam follower means and cam means being constructed and arranged to cause separation of the movable contact from the stationary contact with rapid action at a predetermined position of the cam shaft, and to cause the movable contact to engage the stationary contact when the cam shaft is away from said position, latch means movable into latching position when the contacts are separated for holding the contacts separated, and means on the cam shaft for releasing said latch means as the cam shaft is manually moved away from said predetermined position causing the contacts to engage with rapid action independent of the speed at which the cam shaft is manually set.
Claim 3
Dependent Claim
66 words
The combination recited in claim 1 in which the movable contact is biased toward the relatively stationary contact and in which the cam follower means is biased in a direction to disengage the movable contact with sufficient force to overcome the bias of the movable contact, the cam means being generally circular and having a drop-off into which the cam follower drops at said predetermined position.
Claim 4
Dependent Claim
38 words
The combination recited in claim 1 in which the cam means and cam follower means separates the contacts with a relatively wide gap and in which the latch means allows the gap to become relatively small before releasing.
Claim 5
Dependent Claim
36 words
The combination recited in claim 1 in which the cam means and latch releasing means on the cam shaft are double acting, permitting manual rotation of the cam shaft in either direction from said predetermined position.
Claim 6
Dependent Claim
35 words
The combination recited in claim 1 in which the latch releasing means is rigidly mounted on the shaft and the cam means is mounted loosely on the shaft and driven by the latch releasing means.
Claim 7
Dependent Claim
36 words
The combination recited in claim 2 in which the cam means and latch releasing means on the cam shaft are double acting, permitting manual rotation of the cam shaft in either direction from said predetermined position.
Claim 8
Dependent Claim
35 words
The combination recited in claim 2 in which the latch releasing means is rigidly mounted on the shaft and the cam means is mounted loosely on the shaft and driven by the latch releasing means.
References Cited (Backward Citations)
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US3100823A
Cited
US2925478A
Cited
US2960582A
Cited
US3107281A
Cited
US3199012A
Cited
US3264817A
Cited
US3599006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |