Patent US3799387A successfully refreshed from Google Patents.
US3799387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating unit for clothes dryers
Assignee: Whirlpool Corp
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Filing: 1971-11-18
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Granted: 1974-03-26
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Expires: 1991-11-18
Abstract
Abstract A heater box assembly for an electrically heated clothes dryer has a pair of spaced insulators with a wire heating element wound around the two insulators and with adjacent turns spaced apart. The support for the heating unit includes at least one spring acting on at least one insulator to apply a tension on the wire heating element to compensate for the change in length of the wire element due to thermal expansion. The box-like support is snugly received in a flanged opening of a wall of the dryer to form the heated air inlet for the dryer and mounting means including one or more tabs on the box for insertion into one or more corresponding slots in the flanged opening and a single fastener for securing the box at a side removed from the position of the slot or slots.
Inventors
- 👤 F Zenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:00
CPC Classifications
A; A47; A47K; A47K10/00; A47K10/04; A47K10/06; D; D06; D06F; D06F58/00; D06F58/20; D06F58/26; H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
A box for attachment in an opening in a stationary wall of a laundry appliance, the opening having a peripheral flange extending substantially at a right angle to the plane of the wall, comprising: means for forming a box including one member having a cup-shape portion with a peripheral wall and a perforated bottom, said cup-shaped portion being complementary to the opening and having a size for enabling a snug fit in the opening with the peripheral wall of the portion being engaged with the peripheral flange; and securing means for attaching the box on the wall with said cupshaped portion received in the opening including retaining means disposed on said box for attaching the box to the wall and a coacting tab and slot, said coacting tab and slot comprising a tab formed in the peripheral wall of said portion and said slot being formed in the peripheral flange of the opening and being dimensioned to receive said tab so that securing of the box to the wall is accomplished by engaging the coacting tab and slot and preventing their disengagement by completing the securing with the retaining means.
Claim 2
Dependent Claim
190 words
A box for attachment in an opening in a stationary wall of a laundry appliance, the opening having a peripheral flange extending substantially at a right angle to the plane of the wall, comprising: means for forming a box including one member having a cup-shape portion with a peripheral wall and a perforated bottom, said cup-shaped portion being complementary to the opening and having a size for enabling a snug fit in the opening with the peripheral wall of the portion being engaged with the peripheral flange; and securing means for attaching the box on the wall with said cupshaped portion received in the opening including retaining means disposed on said box for attaching the box to the wall and a coacting tab and slot, said coacting tab and slot comprising a tab formed in the peripheral wall of said portion and said slot being formed in the peripheral flange of the opening and being dimensioned to receive said tab so that securing of the box to the wall is accomplished by engaging the coacting tab and slot and preventing their disengagement by completing the securing with the retaining means.
Claim 3
Dependent Claim
184 words
A box for attachment in an opening in a stationary wall of a laundry appliance, comprising: means for forming a box including one member having a cup-shaped portion with a peripheral wall and a bottom, said portion being complementary to the opening and having a size for enabling a snug fit of the peripheral wall of the portion in the opening; and securing means for attaching the box on the wall with said portion received in the opening, said securing means including a tab coacting with a slit adjacent the periphery of the opening for holding the portion in the opening, and retainer means disposed on said box for attaching the box to the wall, said retainer means comprises strap attached to a side wall of the box furthest removed from said coacting tab and slot, and a fastening means for securing a portion of said strap to the wall of the laundry device, so that securing of the box to the wall is accomplished by engaging the coacting tab and slot and preventing their disengagement by completing the securing with the retaining means.
Claim 4
Dependent Claim
184 words
A box for attachment in an opening in a stationary wall of a laundry appliance, comprising: means for forming a box including one member having a cup-shaped portion with a peripheral wall and a bottom, said portion being complementary to the opening and having a size for enabling a snug fit of the peripheral wall of the portion in the opening; and securing means for attaching the box on the wall with said portion received in the opening, said securing means including a tab coacting with a slit adjacent the periphery of the opening for holding the portion in the opening, and retainer means disposed on said box for attaching the box to the wall, said retainer means comprises strap attached to a side wall of the box furthest removed from said coacting tab and slot, and a fastening means for securing a portion of said strap to the wall of the laundry device, so that securing of the box to the wall is accomplished by engaging the coacting tab and slot and preventing their disengagement by completing the securing with the retaining means.
References Cited (Backward Citations)
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |