US4485566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tumbler dryer for the drying of laundry
Assignee: Ranco Inc of Delaware
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Filing: 1981-04-24
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Granted: 1984-12-04
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Expires: 2001-04-24
Abstract
Abstract A tumble dryer for the drying of laundry comprises a drum (2) arranged in a housing (1) and driven by a motor (3), heating means (7) for heating the air entering the dryer and being guided through the drum (2), first and second temperature sensing means (12, 13) for sensing the temperatures of the air led into the drum (2) and being discharged from the drum (2), and control means connected to the temperature sensing means (12, 13) for energizing and de-energizing the heating means (7) and the drum motor (3). In order to ensure a cooling down period dependent on the drum content and humidity to achieve a desired remaining humidity of the drum content the air led to the drum is guided for preheating before passing the heating means over and around the drum (2), the first temperature sensing means (12) is arranged for sensing the temperature of the preheated air (10) upstream of the heating means (7) and the control means de-energizes the heating means ( 7) upon reaching a first presettable temperature difference of the preheated and the discharged air (10, 8) and de-energizes the drum motor (3) upon reaching a second temperature difference of the preheated and the discharged air (10, 8).
Inventors
- 👤 Alain Vivares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:19
CPC Classifications
D; D06; D06F; D06F58/00; D06F58/02; D06F2103/00; D06F2103/02; D06F2103/08; D06F2103/28; D06F2103/32; D06F2103/34; D06F2103/44; D06F2105/00; D06F2105/28; D06F2105/46; D06F58/32; D06F58/34; D06F58/36; D06F58/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
A tumble dryer for drying laundry or the like, comprising a drum supported in a housing and driven by a motor, heating means for heating air entering the drum, first and second temperature sensing means for sensing the temperatures of the air led into the drum and being discharged from the drum, and control means connected to the temperature sensing means for energizing and de-energizing the heating means and the drum motor, characterized in that the air is guided over and around the drum for preheating before passing the heating means, that the first temperature sensing means is arranged for sensing the temperature of the preheated air upstream of the heating means and that the control means de-energizes the heating means upon reaching a first presettable temperature difference of the preheated and the discharged air and de-energizes the motor upon reaching a second temperature difference of the preheated and the discharged air.
Claim 2
Dependent Claim
152 words
A tumble dryer for drying laundry or the like, comprising a drum supported in a housing and driven by a motor, heating means for heating air entering the drum, first and second temperature sensing means for sensing the temperatures of the air led into the drum and being discharged from the drum, and control means connected to the temperature sensing means for energizing and de-energizing the heating means and the drum motor, characterized in that the air is guided over and around the drum for preheating before passing the heating means, that the first temperature sensing means is arranged for sensing the temperature of the preheated air upstream of the heating means and that the control means de-energizes the heating means upon reaching a first presettable temperature difference of the preheated and the discharged air and de-energizes the motor upon reaching a second temperature difference of the preheated and the discharged air.
Claim 3
Dependent Claim
32 words
A tumble dryer according to claim 1, characterized in that the first temperature sensing means is arranged directly upstream of the heating means and protected against heat radiation from the heating means.
Claim 4
Dependent Claim
32 words
A tumble dryer according to claim 1 or 2, characterized in that the second temperature sensing means is arranged at the end of an outlet duct for air discharged from the dryer.
Claim 5
Dependent Claim
28 words
A tumble dryer according to claims 1, 2 or 3, characterized in that the temperature sensing means are thermistors and the control means is an electronic control means.
Claim 6
Dependent Claim
31 words
A tumble dryer according to claims 1, 2 or 3, characterized in that the temperature sensing means are vapor or liquid filled sensors and the control means are mechanical control means.
Claim 7
Dependent Claim
38 words
A tumble dryer according to claim 1 wherein said control means is constructed and arranged to de-energize said drum motor in response to a second temperature difference ranging between zero and a predetermined relatively low absolute temperature differential.
Claim 8
Dependent Claim
185 words
A tumble dryer for drying laundry or the like, including a drum supported in a housing and driven by a motor, heating means for heating air entering the drum, the heated air being led through the drum, and being discharged through an outlet duct, first and second temperature sensing means for respectively sensing the temperature of the air led to said heating means and the air being discharged from the drum, and control means connected to the temperature sensing means for energizing and de-energizing the heating means and the drum motor, characterized in that at least a portion of the air entering the drum is guided into heat transfer relationship with the drum for preheating by the drum before passing the heating means, that the first temperature sensing means is arranged for sensing the temperature of the preheated air upstream of the heating means and that the control means de-energizes the heating means upon reaching a first presettable temperature difference of the preheated and the discharged air and de-energizes the drum motor upon reaching a second temperature difference of the preheated and the discharged air.
Claim 9
Dependent Claim
185 words
A tumble dryer for drying laundry or the like, including a drum supported in a housing and driven by a motor, heating means for heating air entering the drum, the heated air being led through the drum, and being discharged through an outlet duct, first and second temperature sensing means for respectively sensing the temperature of the air led to said heating means and the air being discharged from the drum, and control means connected to the temperature sensing means for energizing and de-energizing the heating means and the drum motor, characterized in that at least a portion of the air entering the drum is guided into heat transfer relationship with the drum for preheating by the drum before passing the heating means, that the first temperature sensing means is arranged for sensing the temperature of the preheated air upstream of the heating means and that the control means de-energizes the heating means upon reaching a first presettable temperature difference of the preheated and the discharged air and de-energizes the drum motor upon reaching a second temperature difference of the preheated and the discharged air.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |