US3706448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skids or beams for furnaces
Assignee: British Iron and Steel Research Association BISRA
•
Filing: 1971-01-21
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Granted: 1972-12-19
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Expires: 1991-01-21
Abstract
Abstract A skid or beam for a slab reheating furnace has a hollow water cooled pipe with a rail welded along the top of the pipe on which the slabs bear. The rail is of inverted channel section with two outer limbs extending downwardly from an upper portion. The lower ends of the outer limbs are welded to the pipe. Preformed grooves extend across the bearing surface of the rail at spaced locations along its length. The channel shaped rail minimizes conduction of heat from the slabs to the pipe and in use the grooves crack and relieve stresses caused by the temperature differences across the rail.
Inventors
- 👤 Frank Michael Salter
- 👤 John Edwin Dibley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:43
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/02; F27D3/022
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A skid or beam for a furnace including a hollow pipe adapted to allow a cooling fluid to be passed therethrough and a rail welded on top of the pipe, the rail providing a bearing surface for the stock to be heated, in which the improvement comprises a rail of inverted channel section with two outer limbs extending downwardly from an upper portion, the lower ends of the outer limbs being continuous throughout the length of the rail and being welded to the pipe, and the upper portion of the rail having a number of stress relieving discontinuities spaced along its length.
Claim 2
Dependent Claim
102 words
A skid or beam for a furnace including a hollow pipe adapted to allow a cooling fluid to be passed therethrough and a rail welded on top of the pipe, the rail providing a bearing surface for the stock to be heated, in which the improvement comprises a rail of inverted channel section with two outer limbs extending downwardly from an upper portion, the lower ends of the outer limbs being continuous throughout the length of the rail and being welded to the pipe, and the upper portion of the rail having a number of stress relieving discontinuities spaced along its length.
Claim 3
Dependent Claim
24 words
A skid or beam as claimed in claim 1 in which the discontinuities include grooves extending right across the bearing surface of the rail.
Claim 4
Dependent Claim
24 words
A skid or beam as claimed in claim 2 in which the walls of the grooves meet the bearing surface at an obtuse angle.
Claim 5
Dependent Claim
26 words
A skid or beam as claimed in claim 1 in which the discontinuities include grooves extending across the underside of the upper portion of the rail.
Claim 6
Dependent Claim
33 words
A skid or beam as claimed in claim 2 in which the discontinuities further include a groove extending across the underside of the upper portion directly under each groove on the bearing surface.
Claim 7
Dependent Claim
37 words
A skid or beam as claimed in claim 1 in which the discontinuities extend down at least part of the outer surfaces of the two outer limbs and terminate in holes passing right through the outer limbs.
Claim 8
Dependent Claim
23 words
A skid or beam as claimed in claim 1 in which the rail is made of 50 or 51 percent cobalt steel alloy.
Claim 9
Dependent Claim
20 words
A skid or beam as claimed in claim 1 including a layer of thermal insulating material for insulating the pipe.
Claim 10
Dependent Claim
24 words
A skid or beam as claimed in claim 1 in which the rail is made up of a series of rail lengths welded together.
Claim 11
Dependent Claim
27 words
A skid or beam as claimed in claim 1 in combination with a furnace which has heating means disposed both below and above the skid or beam.
Claim 12
Dependent Claim
23 words
A skid or beam as claimed in claim 1 wherein said stress relieving discontinuities are provided in the bearing surface of the rail.
References Cited (Backward Citations)
US2044165A
Cited
US2105838A
Cited
US2553609A
Cited
US2757084A
Cited
US3304070A
Cited
US3214152A
Cited
US3236507A
Cited
US3544094A
Cited
US3552729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |