US3922924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual preset timer
Assignee: Deltrol Corp
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Filing: 1974-12-19
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Granted: 1975-12-02
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Expires: 1994-12-19
Abstract
Abstract A manual preset interval timer in which drag on the timer cam shaft is eliminated after the timer is set so that it can run back to the OFF position with almost zero torque applied. The timer cam during the initial setting stroke lifts a switch operator through a pawl to timing position where it is held by a latch. The pawl and cam are arranged to apply a component of force to the pawl to hold it in driving position during the setting stroke. This component of force instantly disappears at the end of the setting stroke to unload the cam.
Inventors
- 👤 John L Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:56
CPC Classifications
G; G04; G04F; G04F3/00; G04F3/06; G05; G05G; G05G17/00; G05G21/00; Y; Y10; Y10T; Y10T74/00; Y10T74/11; Y10T74/114
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
239 words
In a timing device, controller operating means movable through a predetermined stroke between a timing position and a timed-out position, timing means having a timed-out position and being movable in one direction from its timed-out position to a timing position, said timing means being constructed and arranged to run in the opposite direction back to its timed-out position, means including latch means for holding the operating means in timing position when the latch means is engaged and for returning the operating means to timed-out position when the latch means is disengaged, one way drive means between the timing means and operating means and arranged to move the operating means through a driven stroke from timed-out position to timing position for engagement of the latch means as said timing means is moved in said one direction from its timed-out position, said one way drive means including a pawl bodily carried by one of said two first mentioned means and engaging the other, said pawl and its engaging means being constructed and arranged to provide a component of force holding the pawl in driving position while the operating means is being moved through its driven stroke and to reduce said component of force at the end of said driven stroke so that the pawl is ineffective to hold the operating means in timing position, and means actuated by the timing means on reaching its timed-out position for releasing the latch means.
Claim 2
Dependent Claim
239 words
In a timing device, controller operating means movable through a predetermined stroke between a timing position and a timed-out position, timing means having a timed-out position and being movable in one direction from its timed-out position to a timing position, said timing means being constructed and arranged to run in the opposite direction back to its timed-out position, means including latch means for holding the operating means in timing position when the latch means is engaged and for returning the operating means to timed-out position when the latch means is disengaged, one way drive means between the timing means and operating means and arranged to move the operating means through a driven stroke from timed-out position to timing position for engagement of the latch means as said timing means is moved in said one direction from its timed-out position, said one way drive means including a pawl bodily carried by one of said two first mentioned means and engaging the other, said pawl and its engaging means being constructed and arranged to provide a component of force holding the pawl in driving position while the operating means is being moved through its driven stroke and to reduce said component of force at the end of said driven stroke so that the pawl is ineffective to hold the operating means in timing position, and means actuated by the timing means on reaching its timed-out position for releasing the latch means.
Claim 3
Dependent Claim
31 words
The combination recited in claim 1 in which the pawl is pivoted to the operating means and the timing means includes a cam having a surface engaging and lifting the pawl.
Claim 4
Dependent Claim
56 words
The combination recited iN claim 1 in which the pawl is pivoted to the operating means and the timing means includes a cam shaft having a cam segment, one part of said segment being arranged to engage and lift the pawl and another part of said segment being arranged to engage and release the latch means.
Claim 5
Dependent Claim
99 words
The combination recited in claim 1 in which the operating means is a lever having a pivot on one side of the timing means, said lever extending to the other side of the timing means and having a latch engaging surface, said latch means including a latch lever having a pivot on said other side of the timing means and a latch portion cooperating with said latch engaging surface, said latch lever also having an operating leg extending back to said one side of the timing means and being actuated by said timing means at said one side thereof.
Claim 6
Dependent Claim
122 words
The combination recited in claim 1 in which the operating means is a lever and the timing means is a cam shaft, said lever being pivoted at one side of the cam shaft and extending to the other side thereof and having a latch engaging surface, said latch means including a latch lever having a pivot on said other side of the cam shaft and a latch portion cooperating with said latch engaging surface, said latch lever having an operating leg extending back to said one side of the cam shaft and being actuated by the cam shaft at a location on said one side thereof, said pawl being pivoted to the operating means and extending to a point adjacent said location.
Claim 7
Dependent Claim
58 words
The combination recited in claim 1 in which the pawl is formed with two surfaces at substantial angles to each other, one surface providing the component of force holding the pawl in driving position during the stroke of the operating means and the other surface being contacted at the end of the stroke terminating said component of force.
Claim 8
Dependent Claim
31 words
The combination recited in claim 6 in which the pawl is pivoted to the operating means and is engaged by the timing means during the driven stroke of the operating means.
Claim 9
Dependent Claim
58 words
The combination recited in claim 5 in which the pawl is pivoted to the lever at a point substantially spaced from the location where the latch lever is actuated and extends adjacent to said location, the cam shaft including a camming portion having two sides, one side engaging the pawl and the other side engaging the latch means.
Claim 10
Dependent Claim
59 words
The combination recited in claim 8 in which the pawl is formed with two surfaces at substantial angles to each other, one surface providing the component of force holding the pawl in driving position during the driven stroke of the operating means and the other surface being contacted at the end of the stroke, terminating the component of force.
Claim 11
Dependent Claim
68 words
The combination recited in claim 9 in which the pawl is in tension during the driven stroke of the operating means and is provided with stop means between it and the operating means lever for determining the location of the pawl relative to the lever during the driven stroke of the lever, the one surface of the pawl being arranged to hold the pawl against the stop means.
References Cited (Backward Citations)
US3489015A
Cited
US3699281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |