Patent US3569667A successfully refreshed from Google Patents.
US3569667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for electric strip heater
Assignee: Varispace Industries Inc
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Filing: 1969-07-11
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Granted: 1971-03-09
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Expires: 1989-07-11
Abstract
Abstract A control for a strip heater supported on a frame uses a lever pivoted on the frame to have a short lever arm engaged by a carriage carrying the movable end of the strip and a long lever arm coupled to an adjustable element in an electric circuit having a variable power output for energizing the strip.
Inventors
- 👤 Edward L Ryswick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:30
CPC Classifications
H; H05; H05B; H05B3/00; G; G05; G05D; G05D23/00; G05D23/19; G05D23/275; G05D23/27535; G05D23/27541
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
137 words
A control for an electric strip heater having a fixed end secured to a supporting frame and a movable end secured to a carriage movable relative to said frame as said strip lengthens and shortens at different temperatures, the improvement comprising: a. a lever pivoted on said frame to have a long and a short lever arm; b. a bearing mEmber carried on said carriage to engage said short lever arm for pivoting said lever as a function of said carriage position; c. an electric circuit having a variable power output for energizing said strip; d. an element in said circuit being movable for adjusting said power output; and e. coupling means connecting said long lever arm and said movable element for positioning said element as a function of said lever position for varying said power output.
Claim 2
Dependent Claim
137 words
A control for an electric strip heater having a fixed end secured to a supporting frame and a movable end secured to a carriage movable relative to said frame as said strip lengthens and shortens at different temperatures, the improvement comprising: a. a lever pivoted on said frame to have a long and a short lever arm; b. a bearing mEmber carried on said carriage to engage said short lever arm for pivoting said lever as a function of said carriage position; c. an electric circuit having a variable power output for energizing said strip; d. an element in said circuit being movable for adjusting said power output; and e. coupling means connecting said long lever arm and said movable element for positioning said element as a function of said lever position for varying said power output.
Claim 3
Dependent Claim
16 words
The control of claim 1 wherein said bearing member includes a roller member engaging said lever.
Claim 4
Dependent Claim
17 words
The control of claim 2 wherein said short lever arm has a curved surface engaging said roller.
Claim 5
Dependent Claim
17 words
The control of claim 1 wherein said movable element comprises part of a potentiometer in said circuit.
Claim 6
Dependent Claim
28 words
The control of claim 1 wherein said coupling means comprises a gear sector on said long lever arm meshed with a pinion arranged for turning said movable element.
Claim 7
Dependent Claim
29 words
The control of claim 1 wherein said coupling means comprises a tension band secured to said long lever arm and wrapped around a shaft for turning said movable element.
Claim 8
Dependent Claim
17 words
The control of claim 1 including a spring biasing said long lever arm to tension said strip.
Claim 9
Dependent Claim
25 words
The control of claim 1 including a block in thermal communication with said strip, said block including means for circulating a coolant through said block.
Claim 10
Dependent Claim
33 words
The control of claim 8 wherein said strip is arranged on one side of material to be heated, and said block is arranged on the opposite side of said material to be heated.
Claim 11
Dependent Claim
26 words
The control of claim 9 including an additional one of said blocks arranged on the opposite side of said strip from said material to be heated.
Claim 12
Dependent Claim
17 words
The control of claim 8 including a spring biasing said long lever arm to tension said strip.
Claim 13
Dependent Claim
21 words
The control of claim 11 wherein said bearing member includes a roller engaging a curved surface of said short lever arm.
Claim 14
Dependent Claim
17 words
The control of claim 12 wherein said movable element comprises part of a potentiometer in said circuit.
Claim 15
Dependent Claim
28 words
The control of claim 13 wherein said coupling member comprises a gear sector on said long lever arm meshed with a pinion arranged for turning said potentiometer part.
Claim 16
Dependent Claim
29 words
The control of claim 13 wherein said coupling means comprises a tension band secured to said long lever arm and wrapped around a shaft for turning said potentiometer part.
Claim 17
Dependent Claim
33 words
The control of claim 13 wherein said strip is arranged on one side of material to be heated, and said block is arranged on the opposite side of said material to be heated.
Claim 18
Dependent Claim
26 words
The control of claim 16 including an additional one of said blocks arranged on the opposite side of said strip from said material to be heated.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |