US3552341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a roof hatch assembly
Assignee: Stanray Corp
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Filing: 1968-08-01
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Granted: 1971-01-05
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Expires: 1988-08-01
Abstract
Abstract A method for forming a freight vehicle roof hatch assembly including a circular hatch frame formed integral with a roof sheet and a hatch cover formed from a cutout defining the hatch frame opening. The roof sheet is drawn or stretched into an annular raised section at the location at which the hatch frame is desired. The annular raised section is cut to remove a substantially dish-shaped section so that an opening bounded by an upstanding wall remains on the roof sheet. The upstanding wall is thereafter reformed to a substantially conical configuration of which the end is formed with an outwardly curled lip. The dish-shaped section is reformed into a circular hatch cover having a depending flange seatable about the curled lip.
Inventors
- 👤 William W Lannin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:00
CPC Classifications
B; B21; B21D; B21D53/00; B21D47/00; B21D47/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49796
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
The method of forming a roof hatch assembly including a roof hatch frame and a hatch cover comprising stretching a roof sheet to form an annular raised projection having a top wall spaced above the plane of the roof sheet encompassed by said annular projection, cutting said annular projection along the top wall thereof to form a dishpan section removable from said roof sheet, leaving an opening bounded by a wall of said annular projection, reforming said bounding wall of said projection to form a hatch frame having an outwardly curled weatherlip, and reforming said dishpan section into a hatch cover having a top panel and a peripheral depending flange seatable over said weather lip.
Claim 2
Independent Claim
115 words
The method of forming a roof hatch assembly including a roof hatch frame and a hatch cover comprising stretching a roof sheet to form an annular raised projection having a top wall spaced above the plane of the roof sheet encompassed by said annular projection, cutting said annular projection along the top wall thereof to form a dishpan section removable from said roof sheet, leaving an opening bounded by a wall of said annular projection, reforming said bounding wall of said projection to form a hatch frame having an outwardly curled weatherlip, and reforming said dishpan section into a hatch cover having a top panel and a peripheral depending flange seatable over said weather lip.
Claim 3
Dependent Claim
20 words
The invention as defined in claim 1 wherein said final hatch frame configuration and said hatch cover are cold formed.
Claim 4
Dependent Claim
16 words
The invention as defined in claim 1 wherein said annular projection is formed by hot pressing.
Claim 5
Dependent Claim
35 words
The invention as defined in claim 1 wherein said roof sheet is stretched into an annular projection of substantially trapezoidal cross section including an outer wall and an inner wall joined by said top wall.
Claim 6
Dependent Claim
45 words
The invention as defined in claim 4 wherein said top wall is cut to form said removable dishpan section so that said dishpan section includes said inner wall and a portion of said top wall, said portion of said top wall defining a peripheral lip.
Claim 7
Dependent Claim
47 words
The invention as defined in claim 5 wherein the length of said inner wall and said lip and the diameter of the base of said dishpan section are of a length sufficient to form a hatch cover having a downwardly depending flange seatable over said weather lip.
Claim 8
Dependent Claim
26 words
The invention as defined in claim 1 including forming an inner annular downwardly extending projection in said roof sheet contiguous with said annular upwardly extending projection.
Claim 9
Dependent Claim
38 words
The invention as defined in claim 7 wherein said dishpan, including said inner annular downwardly extending projection and said severed portion of said annular raised projection, is flattened and reformed into a hatch cover having a depending flange.
Claim 10
Dependent Claim
53 words
The invention as defined in claim 1 wherein said cutting is performed by a circular cutting blade movable normal to the plane of the roof sheet, reforming said bounding wall into an upstanding wall upon further normal movement, and finally forming said upstanding wall into a hatch frame including a curled weather lip.
Claim 11
Dependent Claim
53 words
The invention as defined in claim 7 wherein said cutting is performed by a circular cutting blade movable normal to the plane of the roof sheet, reforming said bounding wall into an upstanding wall upon further normal movement, and finally forming said upstanding wall into a hatch frame including a curled weather lip.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |