Patent US3883382A successfully refreshed from Google Patents.
US3883382A
Expired / Lapsed
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Method and apparatuses for retreading worn tires
Assignee: 120528 CANADA Inc
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Filing: 1972-10-27
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Granted: 1975-05-13
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Expires: 1992-10-27
Abstract
Abstract Method and Apparatus for retreading a pneumatic tire wherein the periphery is buffed, and then a fully prevulcanized replacement tread band is disposed around the buffed surface of said tire with a thin layer of uncured bonding material between said buffed surface and the inner surface of the tread band comprising: mounting the tire on rim means which positively locates the beads of the tire; forming a steam chamber inside said tire with a steam impervious envelope; closely encircling the periphery of said tire with an annular steam chamber with a smooth bearing surface for contacting the outward surface of the tread band; disposing a resilient ring on each lateral edge of said tread band for inwardly pressing over the junctions between said tread band and the sides of said tire; and maintaining said resilient rings in place during the curing of the bonding layer.
Inventors
- 👤 Guy Pelletier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:58
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/54; B29D30/56; B29C; B29C33/00; B29C33/0038; Y; Y10; Y10S; Y10S156/00; Y10S156/909
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
244 words
A cold cure retreading apparatus for retreading a worn pneumatic tire whose periphery has been buffed, by means of a fully prevulcanized replacement tread band disposed around the buffed surface of said tire with a thin layer of uncured bonding material between said buffed surface and the inner surface of said tread band; said apparatus comprising a rim mounted centrally of said tire for preventing lateral outward displacement of the beads of the tire, a steam impervious lining for covering the inside surface of said tire and for defining in conjunction with said rim an inner steam chamber, an inner chamber steam supply means in communication with said inner steam chamber for feeding steam to said inner chamber, a peripheral belt for closely encircling the periphery of said tire with said tread band in place thereon, said belt presenting a smooth bearing surface for contacting the outward surface of said tread band, a resilient ring disposed on each lateral edge of said tread band for inwardly pressing over the junctions between said tread band and the sides of said tire, means for retaining said resilient rings in place during curing of said adhesive material, an outer rigid band circumscribing said peripheral belt and defining therewith an outer steam chamber for applying heat to the outward surface of said tread band during said curing, and outer chamber steam supply means in communication with said outer steam chamber for feeding steam to said outer steam chamber.
Claim 2
Dependent Claim
244 words
A cold cure retreading apparatus for retreading a worn pneumatic tire whose periphery has been buffed, by means of a fully prevulcanized replacement tread band disposed around the buffed surface of said tire with a thin layer of uncured bonding material between said buffed surface and the inner surface of said tread band; said apparatus comprising a rim mounted centrally of said tire for preventing lateral outward displacement of the beads of the tire, a steam impervious lining for covering the inside surface of said tire and for defining in conjunction with said rim an inner steam chamber, an inner chamber steam supply means in communication with said inner steam chamber for feeding steam to said inner chamber, a peripheral belt for closely encircling the periphery of said tire with said tread band in place thereon, said belt presenting a smooth bearing surface for contacting the outward surface of said tread band, a resilient ring disposed on each lateral edge of said tread band for inwardly pressing over the junctions between said tread band and the sides of said tire, means for retaining said resilient rings in place during curing of said adhesive material, an outer rigid band circumscribing said peripheral belt and defining therewith an outer steam chamber for applying heat to the outward surface of said tread band during said curing, and outer chamber steam supply means in communication with said outer steam chamber for feeding steam to said outer steam chamber.
Claim 3
Dependent Claim
103 words
Apparatus as defined in claim 1 wherein said peripheral belt comprises a rigid cylindrical wall whose outside diameter is slightly less than the inside diameter of said outer rigid band, and whose inside diameter corresponds to the overall diameter of said tire with said tread band in place thereon, said apparatus also comprising two spaced apart spacer strips retaining said rigid cylindrical wall and said outer ring band to one another and defining therewith said outer steam chamber; one of said means for retaining said resilient rings in place being removable for allowing removal of the associated resilient ring thereby freeing said tire.
Claim 4
Dependent Claim
60 words
Apparatus as defined in claim 1 wherein said peripheral belt comprises an annular band of reinforced rubber or like steam impervious material whose lateral edges are retained in steam sealing engagement to the edges of said outer rigid band, and wherein one of said means for retaining said resilient rings in place is removable for allowing withdrawal of said tire.
Claim 5
Dependent Claim
213 words
Apparatus as defined in claim 3 wherein said annular band of reinforced rubber or like material comprises an endless belt of rubber or like steam impervious flexible material whose width exceeds that of said outer rigid band sufficient for the lateral marginal portions of said endless belt to fold over the opposite edges of said rigid band, said annular band also comprising a flexible tension sheet of generally non-stretchable material which is sufficiently wide for its lateral marginal portions to fold over said endless belt when the latter is in place over said outer band, said apparatus also comprising two annular retainers of angle cross-section fitting over the opposite lateral edges of said outer band and overlying said lateral marginal portions of said endless belt and of said tension sheet, and resilient means interconnecting said two annular retainers and preventing separaTion thereof with sufficient force to prevent excape of steam from within said outer steam chamber at the edges of said outer band when the pressure of said steam in said outer steam chamber is below a predetermined maximum pressure, each annular retainer having a first flange extending inwardly of said annular band and parallel thereto, and each annular retainer having a planar flange resting over the side edges of said annular band.
Claim 6
Dependent Claim
14 words
Apparatus as defined in claim 4 wherein said predetermined pressure is about 40 p.s.i.
Claim 7
Dependent Claim
18 words
Apparatus as defined in claim 1 wherein said resilient rings are inflatable rubber tubes of relatively small cross-section.
Claim 8
Dependent Claim
40 words
Apparatus as defined in claim 3 including bolts pivotally mounted to said outer band at spaced apart locations around the periphery thereof and arranged to retain in position said one means for retaining said resilient rings in place during curing.
Claim 9
Dependent Claim
49 words
Apparatus as defined in claim 4 including a cylindrical receptacle for housing said peripheral belt and said rigid outer band, including a disc shaped cover, a screw means for retaining said cover in place during curing, said cover carrying said one of said means for retaining said resilient rings.
Claim 10
Dependent Claim
221 words
A cold cure retreading process for pneumatic tires comprising preparing the tread portion of a worn pneumatic tire for obtaining a clean and roughened surface suitable for retreading, applying to said roughened surface a fully prevulcanized replacement tread band with a layer of heat curing bonding adhesive disposed between the inner surface of said tread band and said roughened surface, placing a steam impervious flexible lining inside said tire, mounting a tire bead retaining rim centrally of said tire hence defining an inner steam chamber within said tire, placing said tire within a shallow annular curing receptacle comprising an outer steam chamber whose inner wall is a smooth surface closely encircling said tread band, laterally confining the junctions of said tread band and said roughened surface by means of resilient ring means, simultaneously supplying steam to said inner steam chamber and to said outer steam chamber for a period of time and at a temperature sufficient to allow curing of said adhesive, said steam causing radial compression of said tread band onto said roughened surface, and as the last steps in the process cutting off the supply of steam, allowing reduction of the steam pressures within said steam chambers to a safe level, and removing said tire from said receptacle and then removing said rim and said lining from said tire.
Claim 11
Dependent Claim
221 words
A cold cure retreading process for pneumatic tires comprising preparing the tread portion of a worn pneumatic tire for obtaining a clean and roughened surface suitable for retreading, applying to said roughened surface a fully prevulcanized replacement tread band with a layer of heat curing bonding adhesive disposed between the inner surface of said tread band and said roughened surface, placing a steam impervious flexible lining inside said tire, mounting a tire bead retaining rim centrally of said tire hence defining an inner steam chamber within said tire, placing said tire within a shallow annular curing receptacle comprising an outer steam chamber whose inner wall is a smooth surface closely encircling said tread band, laterally confining the junctions of said tread band and said roughened surface by means of resilient ring means, simultaneously supplying steam to said inner steam chamber and to said outer steam chamber for a period of time and at a temperature sufficient to allow curing of said adhesive, said steam causing radial compression of said tread band onto said roughened surface, and as the last steps in the process cutting off the supply of steam, allowing reduction of the steam pressures within said steam chambers to a safe level, and removing said tire from said receptacle and then removing said rim and said lining from said tire.
Claim 12
Dependent Claim
45 words
A process as defined in claim 9 wherein said steam supplied to said inner steam chamber is at a pressure of about 70 p.s.i. and said steam supplied to said outer steam chamber is at a temperature of from 280* F. to about 300* F.
Claim 13
Dependent Claim
39 words
A process as defined in claim 10 wherein said inner wall is made of steam impervious material and wherein the steam supplied to said outer steam chamber is at a pressure of about 30 p.s.i. to about 35 p.s.i.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |