Patent US3738185A successfully refreshed from Google Patents.
US3738185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequential timer
Assignee: France Scott Fetzer Co
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Filing: 1971-04-26
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Granted: 1973-06-12
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Expires: 1991-04-26
Abstract
Abstract A timer includes a disc-type of cam having circular tracks thereon for coaction with switches, all carried by a housing. A motor is mounted on the housing and has an eccentric that acts through a drive pawl on a series of peripheral teeth on the cam. A stop pawl is included which is pivotally mounted for movement about the rotational axis of the eccentric. The eccentric can rotate in either direction to produce incremental movements of the timing cam in one direction, and the pawls can be reversely mounted for use with an appropriate timing cam to produce timing cam movements in the opposite direction. The motor and eccentric can be removed without disturbing the assembled relation of the remainder of the device, such as for factory testing.
Inventors
- 👤 L Wooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:40
CPC Classifications
F; F16; F16H; F16H31/00; F16H31/003; F16H31/004; H; H01; H01H; H01H43/00; H01H43/10; H01H43/101; H01H43/102; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1503; Y10T74/1508
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
166 words
A Sequential timer for controlling a number of electrical circuits in accordance with a predetermined program, comprising in combination: a. a housing; b. a timing cam rotatably supported by said housing and having a series of circularly arranged teeth, said cam being adapted to control the circuits in response to its angular position; c. a motor secured to said housing; d. a rotatable output member driven by said motor and having a drive portion eccentric to the rotational axis of said output member and disposed in radially spaced relation to said teeth; e. a single drive pawl having an aperture receiving said eccentric drive portion for being reciprocated thereby into direct driving engagement with a succession of said teeth for incrementally rotating said timing cam in a step-by-step manner in one direction; and f. a stop pawl supported for pivotal movement about the fixed rotational axis of said output member for successively engaging said teeth to preclude rotation of said timing cam in an opposite direction.
Claim 2
Dependent Claim
166 words
A Sequential timer for controlling a number of electrical circuits in accordance with a predetermined program, comprising in combination: a. a housing; b. a timing cam rotatably supported by said housing and having a series of circularly arranged teeth, said cam being adapted to control the circuits in response to its angular position; c. a motor secured to said housing; d. a rotatable output member driven by said motor and having a drive portion eccentric to the rotational axis of said output member and disposed in radially spaced relation to said teeth; e. a single drive pawl having an aperture receiving said eccentric drive portion for being reciprocated thereby into direct driving engagement with a succession of said teeth for incrementally rotating said timing cam in a step-by-step manner in one direction; and f. a stop pawl supported for pivotal movement about the fixed rotational axis of said output member for successively engaging said teeth to preclude rotation of said timing cam in an opposite direction.
Claim 3
Dependent Claim
27 words
A sequential timer according to claim 1, including a bearing portion on said housing encircling said output member, and received in an aperture in said stop pawl.
Claim 4
Dependent Claim
33 words
A sequential timer according to claim 2, including a plate to which said motor is secured and by which said motor is secured to said housing, said bearing portion being on said plate.
Claim 5
Dependent Claim
48 words
A sequential timer according to claim 1, including a sliding connection between said pawls, and a spring acting between said housing and one of said pawls and urging it against said timing cam, and through said sliding connection urging the other of said pawls against said timing cam.
Claim 6
Dependent Claim
20 words
A sequential timer according to claim 4, said sliding connection comprising a pin and slot disposed respectively in said pawls.
Claim 7
Dependent Claim
32 words
A sequential timer according to claim 5, said pin being on said stop pawl, and said slot being in said drive pawl and extending lengthwise substantially in the direction of its reciprocation.
Claim 8
Dependent Claim
28 words
A sequential timer according to claim 1, said drive pawl aperture being a slot extending lengthwise substantially perpendicular to the direction of the reciprocation of said drive pawl.
Claim 9
Dependent Claim
61 words
A sequential timer according to claim 1, said pawls each having a pair of oppositely facing teeth, one tooth of each pawl being engageable with the teeth of said timing cam to provide clockwise movements thereof, said pawls being selectively assemblable with the other tooth of each pawl engageable with the teeth of said timing cam to provide counterclockwise movements thereof.
Claim 10
Dependent Claim
38 words
A sequential timer according to claim 1, said motor and said output member being detachable as a unit from said housing without disturbing the assembled relation of said timing cam and said pawls with respect to said housing.
Claim 11
Dependent Claim
47 words
A sequential timer according to claim 1, the pivotal movement of said stop pawl being about a point external to said housing, said stop pawl extending with said drive pawl through an aperture in said housing to engage the teeth of said timing cam within said housing.
Claim 12
Dependent Claim
34 words
A sequential timer according to claim 1, both of said pawls being disposed in the same space between a pair of teeth on said timing cam once during each step of timing cam movement.
Claim 13
Dependent Claim
24 words
A sequential timer according to claim 1, including a single spring continually biasing both of said pawls against the teeth of said timing cam.
Claim 14
Dependent Claim
35 words
A sequential timer according to claim 8, in which said oppositely facing teeth of said stop pawl are notched so as to define two end face portions spaced from each other on each pawl tooth.
Claim 15
Dependent Claim
42 words
A sequential timer according to claim 1, said drive pawl aperture being an elongated slot extending transversely to the direction of reciprocation, and said pawls having a pin and slot connection there-between in which the slot extends in said direction of reciprocation.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |