US4330913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat exchangers
Assignee: Peerless of America Inc
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Filing: 1980-10-20
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Granted: 1982-05-25
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Expires: 2000-10-20
Abstract
Abstract The method of making elongated heat exchangers having outwardly projecting fins disposed at various angles to the length and width of the heat exchangers wherein elongated tubular members are fed longitudinally past cutters which are reciprocated into and out of the tubular members in skiving actions and the angles of the cutters relative to the length and width of the tubular members moving therepast are changed between at least some of the reciprocations of the cutters.
Inventors
- 👤 Richard W. Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:36
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21J; B21J5/00; B21J5/06; B21J5/068; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/53; Y10T29/53113; Y10T29/53122
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
The method of forming fins on a heat exchange element, which comprises the steps of (a) feeding an elongated tubular body member longitudinally past a cutter, (b) reciprocating said cutter forwardly and rearwardly toward and away from the outer surface of said body member at an acute angle thereto and cutting into said surface during the forward movement of said cutter in a skiving action, thereby to form an upstanding fin, one edge of which is integral with said body member, and (c) changing the angle of the cutter in a direction transverse to the length of said body member and to the direction of said reciprocation prior to at least some of the forward movements of said cutter, thereby (d) to provide fins positioned at various angles with respect to said body member in a direction transverse to the length and width of said surface.
Claim 2
Independent Claim
146 words
The method of forming fins on a heat exchange element, which comprises the steps of (a) feeding an elongated tubular body member longitudinally past a cutter, (b) reciprocating said cutter forwardly and rearwardly toward and away from the outer surface of said body member at an acute angle thereto and cutting into said surface during the forward movement of said cutter in a skiving action, thereby to form an upstanding fin, one edge of which is integral with said body member, and (c) changing the angle of the cutter in a direction transverse to the length of said body member and to the direction of said reciprocation prior to at least some of the forward movements of said cutter, thereby (d) to provide fins positioned at various angles with respect to said body member in a direction transverse to the length and width of said surface.
Claim 3
Dependent Claim
50 words
The method defined in claim 1, and in which (a) said angle of said cutter transverse to the length of said body member is changed prior to each forward movement of said cutter, thereby (b) to position all adjacent ones of said fins at different ones of said various angles.
Claim 4
Dependent Claim
33 words
The method defined in claim 2, and in which (a) adjacent ones of said changed angles of said cutter are on opposite sides of the perpendicular to said length of said body member.
Claim 5
Dependent Claim
28 words
The method defined in claim 2, and in which (a) said angle of said cutter at alternate changes thereof is perpendicular to the length of said body member.
Claim 6
Dependent Claim
44 words
The method defined in claim 4, and in which (a) adjacent ones of said changed angles of said cutter on opposite sides of said alternate changes are acute angles opening on opposite sides of said angle of a respective one of said alternate changes.
Claim 7
Independent Claim
173 words
The method of forming fins on a heat exchange element, which comprises the steps of (a) feeding an elongated tubular body member, having a substantially rectangular-shaped outer surface, longitudinally past a cutter, having an elongated cutting edge, (b) reciprocating said cutter forwardly and rearwardly toward and away from said surface at an acute angle thereto and cutting into said body member during each forward movement of said cutter in a skiving action, thereby to form adjacent upstanding fins, having elongated edge portions integral with said body member and extending transversely across said surface, and (c) changing the angle of said cutting edge in a direction transverse to the length of said body member and to the transverse width of said surface prior to at least some of the forward movements of said cutter, thereby (d) to provide fins, said edge portions of which are disposed at various angles with respect to said body member in a direction transverse to the length of said body member and to the transverse width of said surface.
Claim 8
Independent Claim
173 words
The method of forming fins on a heat exchange element, which comprises the steps of (a) feeding an elongated tubular body member, having a substantially rectangular-shaped outer surface, longitudinally past a cutter, having an elongated cutting edge, (b) reciprocating said cutter forwardly and rearwardly toward and away from said surface at an acute angle thereto and cutting into said body member during each forward movement of said cutter in a skiving action, thereby to form adjacent upstanding fins, having elongated edge portions integral with said body member and extending transversely across said surface, and (c) changing the angle of said cutting edge in a direction transverse to the length of said body member and to the transverse width of said surface prior to at least some of the forward movements of said cutter, thereby (d) to provide fins, said edge portions of which are disposed at various angles with respect to said body member in a direction transverse to the length of said body member and to the transverse width of said surface.
Claim 9
Dependent Claim
48 words
The method defined in claim 6, and in which (a) said angle of said cutting edge is changed prior to each forward movement of said cutter, thereby (b) to dispose adjacent ones of said edge portions, longitudinally of said body member, at different ones of said various angles.
Claim 10
Dependent Claim
54 words
The method defined in claim 6, and in which (a) certain ones of said various angles open outwardly away from one side of the perpendicular to said length of said body member, and (b) other ones of said various angles open outwardly away from the side opposite to said one side of said perpendicular.
Claim 11
Dependent Claim
28 words
The method defined in claim 6, and in which (a) said outer surface comprises a plurality of elongated, substantially parallel, spaced ribs extending longitudinally of said body member.
Claim 12
Dependent Claim
59 words
The method defined in claim 9, and in which (a) said forward movement of said cutter bar is inwardly through said ribs into the portion of said body member underlying said ribs, whereby (b) each of said fins comprises (1) one of said underlying edge portions, and (2) a plurality of protuberances projecting outwardly from said underlying edge portion.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |