US3722443A
Expired / Lapsed
US
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Method of forming a rectangular heat duct
Assignee: MFG SYST Inc
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Filing: 1971-12-08
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Granted: 1973-03-27
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Expires: 1991-12-08
Abstract
Abstract A machine designed to continuously progress a pair of elongated flat sheets of metal longitudinally through a plurality of cooperative dies which progressively in sequential steps gradually shape the two sheets into a duct having a rectangular cross-sectional configuration. The machine utilizes cooperative rotary dies to shape and form the duct in a continuous operation to a length equal to that of the sheets so that rectangular ducts of any desired length can be produced in an automatic operation by merely inserting into the machine a pre-prepared roll comprised of a pair of sheets of metal of the desired length, the sheets entering the machine at one end and leaving the same at the other end in the form of a continuous rectangular duct.
Inventors
- 👤 L Anderson
- 👤 G Munn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:45
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/06; B21D5/10; B21D5/12; B21D39/00; B21D39/02; B21D39/026; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49924
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
161 words
A method of forming a rectangular air duct in a single continuous operation consisting in: a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively crimping the inner lateral portions at each side of each of said sheets longitudinally from one of its ends toward the other along a corner line to facilitate bending of the lateral portions of each of such sheets toward the corresponding lateral portions of the other, c. bending simultaneously the lateral portions of such sheets toward each other progressively in increments along their lengths until the lateral portions of one of such sheets abuts the lateral portions of the other throughout their lengths and a rectangular configuration in cross-section is thereby defined, and d. progressively forming an interlocking seam in the abutting lateral portions of such sheets from a point adjacent one of their ends toward the other to positively lock and maintain such sheets in a cooperative rectangular duct-defining relation.
Claim 2
Independent Claim
161 words
A method of forming a rectangular air duct in a single continuous operation consisting in: a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively crimping the inner lateral portions at each side of each of said sheets longitudinally from one of its ends toward the other along a corner line to facilitate bending of the lateral portions of each of such sheets toward the corresponding lateral portions of the other, c. bending simultaneously the lateral portions of such sheets toward each other progressively in increments along their lengths until the lateral portions of one of such sheets abuts the lateral portions of the other throughout their lengths and a rectangular configuration in cross-section is thereby defined, and d. progressively forming an interlocking seam in the abutting lateral portions of such sheets from a point adjacent one of their ends toward the other to positively lock and maintain such sheets in a cooperative rectangular duct-defining relation.
Claim 3
Dependent Claim
92 words
The method defined in claim 1, and e. progressively bending the outer lateral portions of said sheets longitudinally along seam lines so as to cause said outer lateral portions to extend substantially normal to their adjacent inner lateral portions and parallel to and in abutting relation to each other when the rectangular configuration has been defined, and f. progressively bending the extreme lateral portions of one of said sheets so as to extend away from and parallel to its supporting inner lateral portioNs preparatory to the formation of an interlocking seam therefrom.
Claim 4
Dependent Claim
54 words
The method defined in claim 2, and finally bending said extreme lateral portions of one of said sheets so as to extend around the outer edge of the extreme lateral portion of the other sheet and along the opposite side thereof in close abutting relation preparatory to the formation of an interlocking seam therein.
Claim 5
Dependent Claim
35 words
The method defined in claim 1 wherein forming said interlocking seam consists in simultaneously deforming in a progressive manner along their lengths the abutting lateral portions of said sheets while they are in abutting relation.
Claim 6
Dependent Claim
54 words
The method defined in claim 1 wherein forming said interlocking seam consists in simultaneously deforming in a progressive manner along their lengths the abutting lateral portions of said sheets at points spaced along substantially the entire lengths of said abutting portions to cause the deformations produced therein to lock such portions to each other.
Claim 7
Dependent Claim
36 words
The method defined in claim 1 wherein each of the crimping and bending steps set forth therein is performed sequentially and progressively upon such sheets from one of their ends toward and to the other end.
Claim 8
Dependent Claim
34 words
The method defined in claim 1 wherein each of said crimping, bending, and forming operations is performed sequentially and progressively upon such sheets from one of their ends toward and to the other end.
Claim 9
Dependent Claim
38 words
The method defined in claim 1 wherein each of the crimping operations set forth therein is accomplished by passing said sheets longitudinally through cooperative rotary crimping members from one of their ends toward and to the other end.
Claim 10
Dependent Claim
38 words
The method defined in claim 1 wherein each of the bending operations set forth therein is accomplished by passing said sheets longitudinally from one of their ends toward and to the other end between cooperative rotary bending members.
Claim 11
Dependent Claim
37 words
The method defined in claim 1 wherein the seam forming operations set forth therein are accomplished by passing said sheets longitudinally from one of their ends toward and to the other end between cooperative rotary die members.
Claim 12
Dependent Claim
37 words
The method defined in claim 1 wherein the crimping and bending operations set forth therein are accomplished by passing such sheets longitudinally from one of their ends toward and to the other end between cooperative rotary members.
Claim 13
Dependent Claim
38 words
The method defined in claim 1 wherein the crimping, bending, and forming operations set forth therein are accomplished by passing such sheets longitudinally from one of their ends toward and to the other end between cooperative rotary members.
Claim 14
Independent Claim
146 words
A method of forming a duct having a rectangular cross section in a single continuous operation consisting in: a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively crimping a sharp corner line in the inner lateral portion of each of said sheets at each of its sides, c. progressively bending the lateral portions of each of said sheets at its corner lines toward each other in increments along their lengths until the lateral portions of one of said sheets extend adjacent to and along the lateral portions of the other throughout their lengths and said sheets thereby cooperatively define a rectangular configuration in cross section, and d. progressively securing such adjacent lateral portions of the one such sheet to those of the other along the length of said sheets in order to maintain said sheets in cooperative rectangular duct-defining relation.
Claim 15
Independent Claim
146 words
A method of forming a duct having a rectangular cross section in a single continuous operation consisting in: a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively crimping a sharp corner line in the inner lateral portion of each of said sheets at each of its sides, c. progressively bending the lateral portions of each of said sheets at its corner lines toward each other in increments along their lengths until the lateral portions of one of said sheets extend adjacent to and along the lateral portions of the other throughout their lengths and said sheets thereby cooperatively define a rectangular configuration in cross section, and d. progressively securing such adjacent lateral portions of the one such sheet to those of the other along the length of said sheets in order to maintain said sheets in cooperative rectangular duct-defining relation.
Claim 16
Independent Claim
146 words
A method of forming a rectangular air duct in a single continuous operation consisting in: a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively crimping the inner lateral portions of said sheets longitudinally from one of their ends to the other along corner lines to facilitate bending of the lateral portions of such sheets toward each other, c. simultaneously bending the lateral portions of such sheets toward each other progresSively in increments along their lengths until the lateral portions of one of such sheets overlaps the lateral portions of the other throughout their lengths and a rectangular configuration in cross section is thereby defined, and d. progressively forming an interlocking seam in the overlapping lateral portions of such sheets from one of their ends to the other to positively lock and maintain such sheets in a cooperative rectangular duct-defining relation.
Claim 17
Independent Claim
146 words
A method of forming a rectangular air duct in a single continuous operation consisting in: a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively crimping the inner lateral portions of said sheets longitudinally from one of their ends to the other along corner lines to facilitate bending of the lateral portions of such sheets toward each other, c. simultaneously bending the lateral portions of such sheets toward each other progresSively in increments along their lengths until the lateral portions of one of such sheets overlaps the lateral portions of the other throughout their lengths and a rectangular configuration in cross section is thereby defined, and d. progressively forming an interlocking seam in the overlapping lateral portions of such sheets from one of their ends to the other to positively lock and maintain such sheets in a cooperative rectangular duct-defining relation.
Claim 18
Dependent Claim
92 words
The method defined in claim 14, and e. progressively bending the outer lateral portions of said sheets longitudinally along seam lines so as to cause said outer lateral portions to extend substantially normal to their adjacent inner lateral portions and parallel to and in abutting relation to each other when the rectangular configuration has been defined, and f. progressively bending the extreme lateral portions of one of said sheets so as to extend away from and parallel to its supporting inner lateral portions prior to the formation of an interlocking seal therefrom.
Claim 19
Dependent Claim
54 words
The method defined in claim 15, and finally bending said extreme lateral portions of one of said sheets so as to extend around the outer edge of the extreme lateral portion of the other sheet and along the opposite side thereof in close abutting relation prior to the formation of an interlocking seam therein.
Claim 20
Dependent Claim
35 words
The method defined in claim 14 wherein forming said interlocking seam consists in simultaneously deforming in a progressive manner along their lengths the overlapping lateral portions of said sheets while they are in abutting relation.
Claim 21
Dependent Claim
54 words
The method defined in claim 14 wherein forming said interlocking seam consists in simultaneously deforming in a progressive manner along their lengths the overlapping lateral portions of said sheets at points spaced along substantially the entire lengths of said overlapping portions to cause the deformations produced therein to lock such portions to each other.
Claim 22
Dependent Claim
156 words
Method of forming a rectangular-duct in a single continuous operation consisting in a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively moving longitudinally the lateral portions of each said sheets at each of its sides through a rotary crimping die to form a pair of spaced sharp corner lines therein extending substantially throughout the length of said sheet, c. progressively moving the lateral portions of said sheets against and past a series of bending rollers and thereby progressively bending such lateral portions toward each other until the lateral portions of one of said sheets abuts the corresponding lateral portions of the other throughout the length of said sheets to cooperatively define a rectangular configuration in cross section, and d. progressively securing such adjacent lateral portions of the one such sheet to those of the other along the length of said sheets to maintain such sheets in cooperative rectangular-duct defining relation.
Claim 23
Dependent Claim
156 words
Method of forming a rectangular-duct in a single continuous operation consisting in a. providing a pair of elongated flat metal sheets in spaced parallel relation, b. progressively moving longitudinally the lateral portions of each said sheets at each of its sides through a rotary crimping die to form a pair of spaced sharp corner lines therein extending substantially throughout the length of said sheet, c. progressively moving the lateral portions of said sheets against and past a series of bending rollers and thereby progressively bending such lateral portions toward each other until the lateral portions of one of said sheets abuts the corresponding lateral portions of the other throughout the length of said sheets to cooperatively define a rectangular configuration in cross section, and d. progressively securing such adjacent lateral portions of the one such sheet to those of the other along the length of said sheets to maintain such sheets in cooperative rectangular-duct defining relation.
Claim 24
Dependent Claim
30 words
The method defined in claim 1 wherein said bending operation includes the step of progressively camming the lateral portions of such sheets toward each other in increments along their lengths.
Claim 25
Dependent Claim
55 words
The method defined in claim 1 wherein said bending operation includes camming the lateral portions of such sheets toward each other progressively in increments along their lengths until the lateral portions of one of such sheets abuts the lateral portions of the other throughout their lengths and a rectangular configuration in cross-section is thereby defined.
Claim 26
Dependent Claim
81 words
The method defined in claim 1 wherein said bending operation includes camming the lateral portions of such sheets toward each other progressively in increments along their lengths, and e. progressively bending the outer lateral portions of said sheets longitudinally along seam lines so as to cause said outer lateral portions to extend substantially normal to their adjacent inner lateral portions and parallel to and in abutting reLation in part at least to each other when the rectangular configuration has been defined.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |