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US3711726A Expired / Lapsed US ⏱️ 0.0 years remaining

Bimetallic signal device for appliances

Assignee: Whirlpool Corp
•
Filing: 1972-02-02
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Granted: 1973-01-16
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Expires: 1992-02-02
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Abstract

Abstract A control means for providing a signal indicating a shutdown of an appliance, the control means including a bimetallic element connected in series with the power line to the appliance, the bimetallic element being arranged to deflect substantially upon passage of the current from the source and to return to its original condition upon cessation of the current, the bimetallic element being engageable with a stationary contact for actuating a signal generating device.

Inventors

  • 👤 J Wiechert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 08:32
CPC Classifications
H; H01; H01H; H01H61/00; H01H61/04; D; D06; D06F; D06F34/00; D06F34/04; D06F2105/00; D06F2105/58; D06F2105/60; D06F34/28

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 187 words
An appliance energizing system comprising: means for connecting said appliance to a source of electrical power, a control means connected between said appliance and said source of electrical power, said control means including an elongated warp-type bimetallic element connected in series with said source of electrical power and arranged to deflect substantially and rapidly upon passage of the current from said source therethrough, and to return to its original condition substantially more slowly upon cessation of said current, said element having a first contact thereon at the free end thereof movable through a path of movement of substantial length, a stationary second contact disposed in the path of movement of said first contact and having an effective width less than the length of the path of movement of said first contact so that it is only momentarily engageable with said first contact during the period of such rapid deflection of said bimetallic element and being engageable in wiping engagement with said first contact for a prolonged period upon cessation of said current, and signal means actuated upon engagement of said first contact with said stationary second contact.
Claim 2
Dependent Claim 187 words
An appliance energizing system comprising: means for connecting said appliance to a source of electrical power, a control means connected between said appliance and said source of electrical power, said control means including an elongated warp-type bimetallic element connected in series with said source of electrical power and arranged to deflect substantially and rapidly upon passage of the current from said source therethrough, and to return to its original condition substantially more slowly upon cessation of said current, said element having a first contact thereon at the free end thereof movable through a path of movement of substantial length, a stationary second contact disposed in the path of movement of said first contact and having an effective width less than the length of the path of movement of said first contact so that it is only momentarily engageable with said first contact during the period of such rapid deflection of said bimetallic element and being engageable in wiping engagement with said first contact for a prolonged period upon cessation of said current, and signal means actuated upon engagement of said first contact with said stationary second contact.
Claim 3
Dependent Claim 34 words
The system of claim 1 in which said signal means includes a transmitter arranged to feed a signal into said source of electrical power and a receiver responsive to signals generated by said transmitter.
Claim 4
Dependent Claim 30 words
The system of claim 2 in which said receiver is separate from said transmitter and includes a visual indicator means actuated only upon reception of a signal from said transmitter.
Claim 5
Dependent Claim 12 words
The system of claim 1 in which said appliance is a dryer.

References Cited (Backward Citations)

US3125422A Cited
US2027118A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-16 1976-07-17 1977-01-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-16 1980-07-17 1981-01-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-16 1984-07-17 1985-01-16 $7700.00 Window Closed / Lapsed

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