US3936717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force balance transmitter and parts therefor or the like
Assignee: Robertshaw Controls Co
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Filing: 1974-08-21
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Granted: 1976-02-03
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Expires: 1994-08-21
Abstract
Abstract A force balance transmitter having a frame and a process element carried thereby and being provided with a movable part adapted to move in response to certain changes in the process, the transmitter having feedback means that produces an output signal in relation to a feedback force thereof being created to oppose movement of a movable feedback part thereof. Three levers are pivotally mounted to the frame for transmitting motion of the movable parts of the process element to the movable feedback part of the feedback means whereby the overall height of the transmitter is relatively small in relation to the large ratio being produced by the levers of the transmitter.
Inventors
- 👤 George T. Hardin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:35
CPC Classifications
G; G05; G05B; G05B1/00; G05B11/00; G05B11/44
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
204 words
In a force balance transmitter having a frame means and a process element carried by said frame means and provided with a movable part adapted to move in response to changes in said process, said transmitter having feedback means carried by said frame means and having output signal means for producing a signal in relation to a feedback force thereof created to oppose movement of a movable feedback part thereof, the improvement comprising three levers pivotally mounted to said frame means transmitting motion of said movable part of said process element to said movable feedback part of said feedback means, said three levers comprising first, second and third levers respectively having opposed ends, said first lever having one end thereof interconnected to said movable part of said process element to be pivoted thereby, said second lever having one end thereof interconnected to the other end of said first lever, said third lever having one end thereof interconnected to the other end of said second lever and having the other end thereof interconnected to said movable feedback part of said feedback means, said three levers being arranged in substantially a parallel side-by-side relation with said third lever being disposed intermediate said first and second levers.
Claim 2
Dependent Claim
204 words
In a force balance transmitter having a frame means and a process element carried by said frame means and provided with a movable part adapted to move in response to changes in said process, said transmitter having feedback means carried by said frame means and having output signal means for producing a signal in relation to a feedback force thereof created to oppose movement of a movable feedback part thereof, the improvement comprising three levers pivotally mounted to said frame means transmitting motion of said movable part of said process element to said movable feedback part of said feedback means, said three levers comprising first, second and third levers respectively having opposed ends, said first lever having one end thereof interconnected to said movable part of said process element to be pivoted thereby, said second lever having one end thereof interconnected to the other end of said first lever, said third lever having one end thereof interconnected to the other end of said second lever and having the other end thereof interconnected to said movable feedback part of said feedback means, said three levers being arranged in substantially a parallel side-by-side relation with said third lever being disposed intermediate said first and second levers.
Claim 3
Dependent Claim
17 words
A force balance transmitter as set forth in claim 1 wherein said feedback means is electrically operated.
Claim 4
Dependent Claim
29 words
A force balance transmitter as set forth in claim 2 wherein said movable feedback part comprises an arm pivotally mounted to said frame means and carrying a feedback coil.
Claim 5
Dependent Claim
45 words
A force balance transmitter as set forth in claim 3 wherein said feedback arm has opposed ends, one end of said arm being pivotally mounted to said frame means, said feedback means having means for detecting the position of the other end of said arm.
Claim 6
Dependent Claim
22 words
A force balance transmitter as set forth in claim 4 wherein said coil is carried by said arm intermediate said ends thereof.
Claim 7
Dependent Claim
21 words
A force balance transmitter as set forth in claim 1 wherein said first lever is pivotally mounted between said ends thereof.
Claim 8
Dependent Claim
21 words
A force balance transmitter as set forth in claim 1 wherein said second lever is pivotally mounted between said ends thereof.
Claim 9
Dependent Claim
21 words
A force balance transmitter as set forth in claim 7 and including an adjustable pivot point means for said second lever.
Claim 10
Dependent Claim
22 words
A force balance transmitter as set forth in claim 1 wherein said third lever is pivotally mounted at said one end thereof.
Claim 11
Dependent Claim
60 words
A force balance transmitter as set forth in claim 1 and including a bias spring having one end connected to said first lever and having another end adjustably connected to said frame means, and means for adjusting said other end of said spring relative to said frame means to provide for both coarse and fine zero adjustment of said transmitter.
Claim 12
Dependent Claim
53 words
A force balance transmitter as set forth in claim 10 wherein said means for adjusting said spring includes a rotatable selector member, and gear train means disposed between said other end of said spring and said selector member to transmit adjustment motion of said selector member to said other end of said spring.
Claim 13
Dependent Claim
43 words
A force balance transmitter as set forth in claim 11 wherein said frame means includes a casing covering said spring and gear train therefor, said selector member having a portion thereof disposed outside said casing to permit adjustment thereof without removing said casing.
Claim 14
Dependent Claim
45 words
A force balance transmitter as set forth in claim 1 wherein interconnecting means interconnect said other end of said first lever to said one end of said second lever, said interconnecting means having overtravel means to take up excess pivot movement of said first lever.
Claim 15
Dependent Claim
64 words
A force balance transmitter as set forth in claim 13 wherein said interconnecting means comprises a flexure member having one end thereof interconnected to said second lever and the other end thereof spring pressed to said other end of said first lever by a spring to normally move in unison therewith except when excess movement is provided which is taken up by said spring.
Claim 16
Dependent Claim
22 words
A force balance transmitter as set forth in claim 14 wherein said spring has means for adjusting the force of said spring.
Claim 17
Dependent Claim
30 words
A force balance transmitter as set forth in claim 14 wherein said spring is a compression spring and has one end interconnected to said other end of said flexure member.
References Cited (Backward Citations)
US3123754A
Cited
US3211003A
Cited
US3359471A
Cited
US3449651A
Cited
US3660745A
Cited
US3845348A
Cited
US3832618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |