US4768293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Footwear drying apparatus
Assignee: Individual
•
Filing: 1987-05-11
•
Granted: 1988-09-06
•
Expires: 2007-05-11
Abstract
Abstract Apparatus for blowing air into footwear for warming and/or drying the footwear. The apparatus has a seal for sealing an open or ankle portion of the footwear, and a duct assembly having intake and exhaust ports, and a discharge tube. The seal encircles the discharge tube and has a range of effective diameters to accommodate open portions of footwear of different sizes. The discharge tube is telescopically extensible and retractable of the seal to accommodate footwear of different heights and to retract within the seal for storage. A fan, communicating with the duct assembly and a heating element, draws air into the intake duct and discharges it through the discharge tube into the shoe. The apparatus can be used to warm and/or dry footwear ranging from high stiff ski boots to low soft running shoes, and accommodates a wide range of sizes of such footwear.
Inventors
- 👤 Michael G. Kaffka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:07
CPC Classifications
A; A47; A47L; A47L23/00; A47L23/20; A47L23/205
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
155 words
An apparatus for blowing air into the interior of an item of footwear, the apparatus including: (a) a duct assembly including an intake port and a discharge tube, (b) a fan communicating with the duct assembly and being powered to draw air into the intake port and to discharge the air through the discharge tube into the interior of the footwear, (c) sealing means for engaging an open portion of the item of footwear to provide an adequate seal therewith, the sealing means encircling the discharge tube and having accommodation means for accommodating open portions of footwear of widely different opening sizes, (d) an exhaust port to permit air from the interior of the footwear to flow past the sealing means to atmosphere, (e) the discharge tube being axially extensible and retractable of the sealing means to accommodate the open portions of footwear of different heights, and to retract within the sealing means for storage.
Claim 2
Independent Claim
155 words
An apparatus for blowing air into the interior of an item of footwear, the apparatus including: (a) a duct assembly including an intake port and a discharge tube, (b) a fan communicating with the duct assembly and being powered to draw air into the intake port and to discharge the air through the discharge tube into the interior of the footwear, (c) sealing means for engaging an open portion of the item of footwear to provide an adequate seal therewith, the sealing means encircling the discharge tube and having accommodation means for accommodating open portions of footwear of widely different opening sizes, (d) an exhaust port to permit air from the interior of the footwear to flow past the sealing means to atmosphere, (e) the discharge tube being axially extensible and retractable of the sealing means to accommodate the open portions of footwear of different heights, and to retract within the sealing means for storage.
Claim 3
Dependent Claim
58 words
An apparatus as claimed in claim 1 in which: (a) the discharge tube has a plurality of telescoping tube sections which permit extension and retraction thereof, the discharge tube having a tube inner portion adjacent the sealing means and a tube outer portion which is curved so as to direct air towards a toe end of the footwear.
Claim 4
Dependent Claim
64 words
An apparatus as claimed in claim 2 in which: (a) the telescoping sections include means for preventing relative rotation between adjacent telescoping sections, and relative rotation between the telescoping sections and the sealing means, so as to ensure that, when the apparatus is fitted within the footwear, the outer portion of the discharge tube is always directed towards the toe end of the footwear.
Claim 5
Dependent Claim
36 words
An apparatus as claimed in claim 1 in which: (a) the sealing means has a hollow inner end portion, (b) the discharge tube is retractable to fit within the inner end portion of the sealing means.
Claim 6
Dependent Claim
61 words
An apparatus as claimed in claim 1 in which: (a) the sealing means and accommodating means include a hollow truncated conical member which tapers downwardly from a wider portion to a narrower inner end portion to provide a range of effective diameters, so as to permit insertion into and effective sealing with the open portions of footwear of different opening sizes.
Claim 7
Dependent Claim
86 words
An apparatus as claimed in claim 5 in which: (a) the discharge tube has a plurality of telescoping sections which permit relative extension and retraction, the discharge tube having a tube inner portion adjacent the wider portion of the sealing means, and a tube outer portion which can be retracted to fit within the narrower inner end portion of the sealing means, (b) the tube outer portion is curved to form an elbow portion so as to direct air towards a toe end of the footwear.
Claim 8
Dependent Claim
97 words
An apparatus as claimed in claim 1 in which: (a) the sealing means has a generally hollow lower shell portion having an outer wall which is adapted to seal against open portions of footwear, (b) the discharge tube extends centrally downwardly through the lower shell portion so as to define in part a generally annular space between the discharge tube and the lower shell portion, (c) the exhaust port communicates with the generally annular space between the shell portion and the discharge tube to receive and exhaust from the apparatus air returned from the item of footwear.
Claim 9
Dependent Claim
56 words
An apparatus as claimed in claim 7 in which: (a) the duct assembly has an upper hollow shell portion which extends upwardly from the sealing means, (b) the exhaust means includes the upper hollow shell portion having a plurality of openings which communicate with the generally annular space between the discharge tube and the lower shell.
Claim 10
Dependent Claim
51 words
An apparatus as claimed in claim 8 in which: (a) the lower shell portion and the upper shell portion are concentric, generally truncated conical portions which have co-incident portions of generally equal maximum diameters, and extend downwardly and upwardly from the co-incident portions to form exhaust duct and sealing means assemblies.
Claim 11
Dependent Claim
119 words
An apparatus as claimed in claim 1 in which the apparatus is adapted to blow air simultaneously into a pair of items of footwear, the apparatus including: (a) first and second sealing means for engaging open portions of each item of footwear to provide an adequate seal therewith, the sealing means having accommodation means for accommodating open portions of footwear of varying sizes, (b) the duct assembly includes first and second spaced apart discharge tubes to direct air from the fan into the pair of items of footwear, each discharge tube being extensible and retractable of the respective sealing means to accommodate open portions of footwear of different heights, and to retract within the respective sealing means for storage.
Claim 12
Dependent Claim
64 words
An apparatus as claimed in claim 10 in which: (a) the first and second sealing means and discharge tubes are laterally spaced apart and have respective parallel central axes to cooperate with a pair of items of footwear arranged side by side, (b) the intake port and fan means are disposed symetrically relative to the discharge ducts so as to essentially equalize flow therethrough.
Claim 13
Dependent Claim
41 words
An apparatus as claimed in claim 1 further including: (a) heater means for heating air drawn through the intake port, heater means being positioned between the intake port and the discharge duct so that heated air is discharged into the footwear.
Claim 14
Dependent Claim
52 words
An apparatus as claimed in claim 10 in which: (a) the first and second sealing means are spaced laterally apart, (b) the duct assembly include first and second exhaust ports and, first and second discharge ducts, the sealing, means and the exhaust ports being disposed generally symetrically about the respective discharge tube.
Claim 15
Dependent Claim
74 words
An apparatus as claimed in claim 1 further including: (a) a detachable extension tube having connection means at an inner end thereof to engage releasably the outer end of the discharge tube to receive and discharge air from the discharge tube, the extension tube having a length such that, when engaging the discharge tube, the sealing means interferes with the extension tube and prevents complete retraction of the discharge tube into the sealing means.
Claim 16
Dependent Claim
39 words
An apparatus as claimed in claim 14 in which: (a) the extension tube has an outer end having a small opening to restrict airflow therethrough, and a side wall having perforations to discharge air laterally from the extension tube.
Claim 17
Dependent Claim
44 words
A boot drying apparatus as claimed in claim 1 in which: (a) the accommodation means has a range of effective diameters to permit insertion of the apparatus into footwear having open portions of widely different diameters to provide an effective seal with the footwear.
Claim 18
Independent Claim
206 words
An apparatus for blowing air into the interior of an item of footwear, the apparatus including: (a) a duct assembly including an intake port and a discharge tube, (b) a fan communicating with the duct assembly and being powered to draw air into the intake port and to discharge the air through the discharge tube into the interior of the footwear, (c) sealing means for engaging an open portion of the item of footwear to provide an adequate seal therewith, the sealing means encircling the discharge tube and having accommodation means for accommodating open portions of footwear of different opening sizes, (d) an exhaust port to permit air from the interior of the footwear to flow past the sealing means to atmosphere, (e) the discharge tube being axially extensible and retractable of the sealing means to accommodate the open portions of footwear of different heights, and to retract within the sealing means for storage, (f) the sealing means and accommodating means including a hollow truncated conical member which tapers downwardly from a wider portion to a narrower inner end portion to provide a range of effective diameters, so as to permit insertion into and effective sealing with the open portions of footwear of different opening sizes.
Claim 19
Independent Claim
206 words
An apparatus for blowing air into the interior of an item of footwear, the apparatus including: (a) a duct assembly including an intake port and a discharge tube, (b) a fan communicating with the duct assembly and being powered to draw air into the intake port and to discharge the air through the discharge tube into the interior of the footwear, (c) sealing means for engaging an open portion of the item of footwear to provide an adequate seal therewith, the sealing means encircling the discharge tube and having accommodation means for accommodating open portions of footwear of different opening sizes, (d) an exhaust port to permit air from the interior of the footwear to flow past the sealing means to atmosphere, (e) the discharge tube being axially extensible and retractable of the sealing means to accommodate the open portions of footwear of different heights, and to retract within the sealing means for storage, (f) the sealing means and accommodating means including a hollow truncated conical member which tapers downwardly from a wider portion to a narrower inner end portion to provide a range of effective diameters, so as to permit insertion into and effective sealing with the open portions of footwear of different opening sizes.
Claim 20
Independent Claim
185 words
An apparatus for blowing air into the interior of an item of footwear, the apparatus including: (a) a duct assembly including an intake port, and a discharge tube and, (b) a fan communicating with the duct assembly and being powered to draw air into the intake port and to discharge the air through the discharge tube into the interior of the footwear, (c) sealing means for engaging an open portion of the item of footwear to provide an adequate seal therewith, the sealing means encircling the discharge tube and having accommodation means for accommodating open portions of footwear of different opening sizes. (d) an exhaust port to permit air from the interior of the footwear to flow past the sealing means to atmosphere, (e) the discharge tube being extensible and retractable of the sealing means to accommodate the open portions of footwear of different heights, and to retract within the sealing means, (f) the accommodation means has a range of effective diameters to permit insertion of the apparatus into footwear having open portions of widely different diameters to provide an effective seal with the footwear.
Claim 21
Independent Claim
185 words
An apparatus for blowing air into the interior of an item of footwear, the apparatus including: (a) a duct assembly including an intake port, and a discharge tube and, (b) a fan communicating with the duct assembly and being powered to draw air into the intake port and to discharge the air through the discharge tube into the interior of the footwear, (c) sealing means for engaging an open portion of the item of footwear to provide an adequate seal therewith, the sealing means encircling the discharge tube and having accommodation means for accommodating open portions of footwear of different opening sizes. (d) an exhaust port to permit air from the interior of the footwear to flow past the sealing means to atmosphere, (e) the discharge tube being extensible and retractable of the sealing means to accommodate the open portions of footwear of different heights, and to retract within the sealing means, (f) the accommodation means has a range of effective diameters to permit insertion of the apparatus into footwear having open portions of widely different diameters to provide an effective seal with the footwear.
References Cited (Backward Citations)
DE694904C
Cited
US2856700A
Cited
US3154392A
Cited
US3299529A
Cited
US4171580A
Cited
US4145602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |