US3904356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open coil heat shielding
Assignee: Lee Wilson Engineering Co Inc
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Filing: 1974-04-29
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Granted: 1975-09-09
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Expires: 1994-04-29
Abstract
Abstract Apparatus for and process of heat treating open coils of strip metal, such as strip steel, by passing hot gases or atmospheres through spaces between spaced convolutions of the coil, in which a shielding structure is provided at the upper end of the coil where the coil edge portions are exposed to radiant heat from the furnace and where they may tend to move and distort from gas velocity or localized thermal expansion. The shielding structure protects these portions of the coil from excessive heat and restricts harmful movement thereof, thus improving the quality of the heat treated product. The disclosed shielding structure comprises spaced upwardly extending walls the height of which is sufficient to, and the spacing of which is such as to, prevent direct impingement of radiant heat on the upper end of the coil while permitting adequate flow of gas through the shielding structure for treating purposes.
Inventors
- 👤 Robert R Hill
- 👤 Robert J Beemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:59
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663; C21D9/673
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
204 words
Apparatus for heat treating an open coil having a free end and formed of convolutions of metal strip spirally wound about the axis of the coil and separated by spaces that permit passage of treating gas between said convolutions, which apparatus comprises means for passing treating gas through said spaces between said convolutions of said coil under heat conditions including heat directed laterally of the axis of said coil and toward said free end of said coil that tend to cause substantial distortions of the free edge portions of said convolutions of said coil at said free end of said coil; and means for shielding said free edge portions of said convolutions of said coil against said heat conditions, comprising shielding means demountably located adjacent said free end of said coil and comprising spaced walls extending generally axially of said coil and of sufficient width of said walls and closeness of spacing of said walls to shield said free edge portions of said convolution of said coil adjacent said free end of said coil against said heat conditions and inhibit movements of said free edge portions of said coil but of sufficient distance of spacing between said walls to permit adequate said shielding means.
Claim 2
Dependent Claim
204 words
Apparatus for heat treating an open coil having a free end and formed of convolutions of metal strip spirally wound about the axis of the coil and separated by spaces that permit passage of treating gas between said convolutions, which apparatus comprises means for passing treating gas through said spaces between said convolutions of said coil under heat conditions including heat directed laterally of the axis of said coil and toward said free end of said coil that tend to cause substantial distortions of the free edge portions of said convolutions of said coil at said free end of said coil; and means for shielding said free edge portions of said convolutions of said coil against said heat conditions, comprising shielding means demountably located adjacent said free end of said coil and comprising spaced walls extending generally axially of said coil and of sufficient width of said walls and closeness of spacing of said walls to shield said free edge portions of said convolution of said coil adjacent said free end of said coil against said heat conditions and inhibit movements of said free edge portions of said coil but of sufficient distance of spacing between said walls to permit adequate said shielding means.
Claim 3
Dependent Claim
43 words
The combination of claim 1 in which said coil is disposed with its axis upright and with said free end of said coil at the top or the coil and said shielding means is disposed adjacent said top free end of said coil.
Claim 4
Dependent Claim
68 words
The combination of claim 2 in which said shielding means is of metal and of substantial weight and rests on said top free end of said open coil with the weight of said shielding means distributed over said top free end of said coil so said shielding means frictionally engages the top free edge portions of said coil convolutions and restricts movement of said top free edge portions
Claim 5
Dependent Claim
57 words
The combination of claim 2 in which said shielding means is a substantially rigid apertured plate-like structure demountably supported adjacent said top free end of said coil and comprises substantially upright walls spaced to permit adequate flow of gas transversely through said structure while shielding said top free edge portions of said convolutions from said heat conditions.
Claim 6
Dependent Claim
49 words
The combination of claim 4 in which said shielding means comprises a strip of metal substantially thicker than the thickness of the coiled metal strip being treated, which strip of metal of said shielding means is spirally wound in convolutions with spaces between said convolutions of said shielding means.
Claim 7
Dependent Claim
44 words
The combination of claim 5 in which said spirally wound strip of metal rests on a gas permeable base member that rests on the upper edges of said coil convolutions and distributes the weight of said strip and said base member over said edges.
Claim 8
Dependent Claim
70 words
The combination of claim 4 in which said shielding structure is of substantial weight and in which said upright walls are fixed to a gas permeable planar base member which rests on the top free end of said open coil and distributes the weight of said shielding structure thereover and frictionally engages the top free edge portions of said coil convolutions and restricts movement of said top free edge portions.
Claim 9
Dependent Claim
190 words
Apparatus for heat-treating an open coil having a free end and formed of convolutions of metal spirally wound about the axis of the coil and separated by spaces that permit passage of treating gas between said convolutions, said coil being disposed in said apparatus with its axis upright and said free end of said coil being disposed at the top of the coil, which apparatus comprises means for passing hot treating gas through said spaces between said convolutions of said coil, said apparatus causing radiant heat to be directed downwardly and substantially laterally toward the upper portions of the convolutions of said coil at said free end of said coil; and means for protecting said upper portions of said convolutions of said coil against impingement of said radiant heat comprising shielding means located adjacent said top free end of said coil and comprising spaced, upright walls that are of sufficient height and closeness to substantially shield said upper portions of said convolutions of said coil against impingement of said radiant heat but said walls being spaced sufficiently widely apart to permit adequate flow of treating gas through said shielding means.
Claim 10
Dependent Claim
190 words
Apparatus for heat-treating an open coil having a free end and formed of convolutions of metal spirally wound about the axis of the coil and separated by spaces that permit passage of treating gas between said convolutions, said coil being disposed in said apparatus with its axis upright and said free end of said coil being disposed at the top of the coil, which apparatus comprises means for passing hot treating gas through said spaces between said convolutions of said coil, said apparatus causing radiant heat to be directed downwardly and substantially laterally toward the upper portions of the convolutions of said coil at said free end of said coil; and means for protecting said upper portions of said convolutions of said coil against impingement of said radiant heat comprising shielding means located adjacent said top free end of said coil and comprising spaced, upright walls that are of sufficient height and closeness to substantially shield said upper portions of said convolutions of said coil against impingement of said radiant heat but said walls being spaced sufficiently widely apart to permit adequate flow of treating gas through said shielding means.
Claim 11
Dependent Claim
64 words
The combination of claim 8 in which said shielding means is of substantial weight and rests on the top free end of said coil with the weight of said shielding means distributed over said top free end of said coil so said shielding means frictionally engages the top free edge portions of said coil convolutions and restricts movements of said top free edge portions.
Claim 12
Dependent Claim
33 words
The combination of claim 8 in which reinforcing means extends across and is secured to the edges of at least some of said upright walls of said shielding means at one end thereof.
Claim 13
Dependent Claim
36 words
The apparatus of claim 8 in which said reinforcing means is a gas permeable base member secured to the lower ends of said upright walls and resting on the top free end of said open coil.
Claim 14
Dependent Claim
50 words
The combination of claim 8 in which said shielding means comprises a strip of metal substantially thicker than the thickness of the coiled metal strip being heat treated, which strip of metal of said shielding means is spirally wound in convolutions with spaces between said convolutions of said shielding means.
Claim 15
Dependent Claim
30 words
The apparatus of claim 12 in which said spirally wound strip of metal rests upon a gas permeable base member that rests on the upper edges of said coil convolutions.
Claim 16
Dependent Claim
39 words
The combination of claim 12 in which said heat treating apparatus includes a cover member for said coil which when contacted by hot heat treating gases becomes heated and directs radiant heat toward the upper portion of said coil.
Claim 17
Dependent Claim
156 words
Shielding structure adapted to shield a free end of an open coil of strip metal wound in spiral spaced convolutions from radiant heat during open coil heat-treatment of said coil when said shielding structure is disposed adjacent said free end of said coil, said shielding structure being of a substantially rigid apertured generally plate-like configuration and having spaced walls which when the shielding structure is horizontally disposed extend upwardly and are of relatively small height in comparison to the transverse extent of the shielding structure, the height of said walls and the closeness of the spacing between said walls being such as to prevent substantial impingement of radiant heat on the free end of the coil adjacent which said shielding structure is disposed, but the spacing between said walls being sufficiently wide and sufficiently unimpeded so as to permit adequate flow of treating gas between the convolutions of said coil and transversely through said plate-like structure.
Claim 18
Dependent Claim
156 words
Shielding structure adapted to shield a free end of an open coil of strip metal wound in spiral spaced convolutions from radiant heat during open coil heat-treatment of said coil when said shielding structure is disposed adjacent said free end of said coil, said shielding structure being of a substantially rigid apertured generally plate-like configuration and having spaced walls which when the shielding structure is horizontally disposed extend upwardly and are of relatively small height in comparison to the transverse extent of the shielding structure, the height of said walls and the closeness of the spacing between said walls being such as to prevent substantial impingement of radiant heat on the free end of the coil adjacent which said shielding structure is disposed, but the spacing between said walls being sufficiently wide and sufficiently unimpeded so as to permit adequate flow of treating gas between the convolutions of said coil and transversely through said plate-like structure.
Claim 19
Dependent Claim
36 words
The shielding structure of claim 15 in which the width of said spaced upwardly extending walls of said shielding structure is relatively narrow as compared to the width of the strip metal of the open coil.
Claim 20
Dependent Claim
18 words
The shielding means of claim 15 including reinforcing means secured to said walls for maintaining their spaced positions.
Claim 21
Dependent Claim
79 words
The shielding structure of claim 15 in which said shielding structure is of substantial weight and in which said upright walls are fixed to a gas permeable base member which distributes the weight of said shielding structure over the top free edges of the convolutions of an open coil disposed with its axis upright and restricts movement of said upper edges of said coil convolutions when said shielding structure is placed on the upper end of an open coil.
Claim 22
Dependent Claim
41 words
The shielding means of claim 15 in which said walls are formed of a band of metal of substantially greater thickness than the metal strip of which the open coil is formed, which band of metal is wound in spiral convolutions.
Claim 23
Dependent Claim
154 words
A heat shield structure adapted to be supported on the free top end of an open coil of spaced apart convolutions of strip metal disposed with the axis of the coil substantially vertical and to substantially prevent the direct impingement of radiant heat against the top edge portions of said coil at said free top end of said coil without substantially interfering with the flow of treating gas through the spaces between said spaced apart convolutions of said open coil, which heat shield structure comprises a plurality of spaced apart adjacent baffle wall portions each having one edge lying substantially in a common plane from which said wall portions extend transversely, the other edge of each of said wall portions being located from said first mentioned edge by a distance greater than the distances said wall portions are spaced apart, and means for securing said wall portions together in said rigid heat shield structure.
Claim 24
Dependent Claim
154 words
A heat shield structure adapted to be supported on the free top end of an open coil of spaced apart convolutions of strip metal disposed with the axis of the coil substantially vertical and to substantially prevent the direct impingement of radiant heat against the top edge portions of said coil at said free top end of said coil without substantially interfering with the flow of treating gas through the spaces between said spaced apart convolutions of said open coil, which heat shield structure comprises a plurality of spaced apart adjacent baffle wall portions each having one edge lying substantially in a common plane from which said wall portions extend transversely, the other edge of each of said wall portions being located from said first mentioned edge by a distance greater than the distances said wall portions are spaced apart, and means for securing said wall portions together in said rigid heat shield structure.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |