Patent US3579849A successfully refreshed from Google Patents.
US3579849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat setting of footwear
Assignee: Individual
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Filing: 1968-09-16
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Granted: 1971-05-25
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Expires: 1988-09-16
Abstract
Abstract Heat-setting footwear by advancing same through closed chamber in which hot, moisture-saturated air is circulated. Moisture saturation maintained by hot air passing over shallow evaporation tank continuously supplied with water via a ball valve. Airheating coils in chamber controlled by temperature-responsive device adjacent footwear being treated so as to maintain temperature constant. Also discloses plurality of spaced unitconstruction heat-setting chambers in conjunction with chain conveyor.
Inventors
- 👤 Alfred Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:05
CPC Classifications
F; F26; F26B; F26B15/00; F26B15/10; F26B15/12; F26B15/14; A; A43; A43D; A43D95/00; A43D95/12; A43D95/125; F26B21/00; F26B21/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
Apparatus for use in the heat setting of complete articles of footwear or components thereof, comprising a heat-setting chamber through which said articles or components are advanced; means for producing a circulation of air in said chamber; means for heating the air; an evaporation device which is heated by the circulating air; means for supplying water to the device for evaporation thereby; a flap positioned in the path of the circulating air; a spindle turnably mounted in a wall of the heat-setting chamber and carrying said flap; and a switch which controls said means for heating the air and is arranged to be operated in response to turning of said spindle so as to switch off said heating means in the event that the air circulation is obstructed as detected by return of the flap to a rest position.
Claim 2
Dependent Claim
139 words
Apparatus for use in the heat setting of complete articles of footwear or components thereof, comprising a heat-setting chamber through which said articles or components are advanced; means for producing a circulation of air in said chamber; means for heating the air; an evaporation device which is heated by the circulating air; means for supplying water to the device for evaporation thereby; a flap positioned in the path of the circulating air; a spindle turnably mounted in a wall of the heat-setting chamber and carrying said flap; and a switch which controls said means for heating the air and is arranged to be operated in response to turning of said spindle so as to switch off said heating means in the event that the air circulation is obstructed as detected by return of the flap to a rest position.
Claim 3
Dependent Claim
71 words
Apparatus according to claim 1, wherein the ends of the heat-setting chamber are provided with at least one flap door which comprises a curtain of metal strips suspended side by side from their upper ends so as to discourage heat loss through the ends of the chamber whilst allowing the passage therethrough of a conveyor carrying articles of footwear or footwear components by deflection of at least one of said strips.
Claim 4
Dependent Claim
44 words
Apparatus according to claim 1, wherein the evaporation device comprises a shallow tank, and wherein the means for supplying water to the device comprises a ball valve in the tank arranged to maintain a shallow covering of water over the bottom of the latter.
Claim 5
Dependent Claim
47 words
Apparatus according to claim 3, wherein the tank is positioned in the chamber with one side thereof adjacent said means for heating the air, whereby a temperature differential is produced across the tank which sets up convection currents in the water and promotes circulation of the latter.
Claim 6
Dependent Claim
79 words
Apparatus according to claim 12, wherein said heating means are constituted by electrical heating coils positioned in at least one heating chamber within the heat setting chamber and wherein the means for producing a circulation of air comprises a fan positioned to draw air downwardly through the at least one heating chamber, over the heating coils, the hot air passing out of said heating chambers being directed vertically and then being drawn again through said heating chambers and recirculating.
Claim 7
Dependent Claim
42 words
Apparatus according to claim 5, wherein a temperature-responsive device is provided in the heat-setting chamber and is connected in the electrical supply to said heating coils so as to vary the heat output according to the temperature prevalent in the main chamber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |