US3905758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment tunnel kiln for products having a circular cross-section
Assignee: Ceraver SA
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Filing: 1974-07-05
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Granted: 1975-09-16
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Expires: 1994-07-05
Abstract
Abstract Heat treatment tunnel kiln for products having a circular crosssection, comprising a main heat treatment zone for circulating tubes or bars perpendicular to their axis, ensuring the rolling of the tubes or bars inside the supports, and zones for circulating the supports parallel to their axis, connected to flow circuits for gases different from those in the main zone.
Inventors
- 👤 Jean Moussou
- 👤 Robert Calvet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:39
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/02; F27B9/021; F27B9/022; F27B9/023; F27B9/14; F27B9/20; F27B9/22; F27B9/227; F27B9/24; F27D; F27D5/00; F27D5/0068; F27B9/04; F27B9/045; F27B9/12; F27D3/00; F27D2003/0085; F27D2003/0089; F27D2003/0096; F27D2003/0097
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
159 words
A tunnel kiln comprising: a. a plurality of cylindrical supports, each of which contains a plurality of cavities shaped to receive objects to be heat treated; b. means defining a main treating zone; c. means in said main treating zone for moving said cylindrical supports in a direction perpendicular to their longitudinal axes; d. means in said main treating zone for rotating said cylindrical support about their longitudinal axes during their translational movement in said main treating zone; e. means defining a second treating zone; f. means in said second treating zone for moving said cylindrical support in a direction parallel to their longitudinal axes; g. a first chamber connecting said main treating zone to said second treating zone, said first chamber being adapted to receive at least one of said cylindrical support at a time; and h. means for isolating said first chamber in a gas-tight manner from either said main treating zone or said second treating zone.
Claim 2
Dependent Claim
159 words
A tunnel kiln comprising: a. a plurality of cylindrical supports, each of which contains a plurality of cavities shaped to receive objects to be heat treated; b. means defining a main treating zone; c. means in said main treating zone for moving said cylindrical supports in a direction perpendicular to their longitudinal axes; d. means in said main treating zone for rotating said cylindrical support about their longitudinal axes during their translational movement in said main treating zone; e. means defining a second treating zone; f. means in said second treating zone for moving said cylindrical support in a direction parallel to their longitudinal axes; g. a first chamber connecting said main treating zone to said second treating zone, said first chamber being adapted to receive at least one of said cylindrical support at a time; and h. means for isolating said first chamber in a gas-tight manner from either said main treating zone or said second treating zone.
Claim 3
Dependent Claim
35 words
A tunnel kiln as cLaimed in claim 1 and further comprising means in said second treating zone for rotating said cylindrical support about their longitudinal axes during their translational movement in said second treating zone.
Claim 4
Dependent Claim
63 words
A tunnel kiln as claimed in claim 2 wherein said means in said second treating zone for rotating said cylindrical supports about their longitudinal axes during their translational movement in said second treating zone comprises helical grooves in said cylindrical supports and lugs mounted on the inside wall of said second treating zone and received in the helical grooves in said cylindrical support.
Claim 5
Dependent Claim
82 words
A tunnel kiln as claimed in claim 1 and further comprising: a. fixed slide rails for said cylindrical support mounted in said second treating zone an b. mobile slide rails for said cylindrical supports mounted in said first chamber, said mobile slide rails being movable between a first position in which they are in contact with the adjacent end of said first slide rail and a second position in which they are spaced from the adjacent end of said fixed slide rail.
Claim 6
Dependent Claim
26 words
A tunnel kiln as claimed in claim 1 wherein the directions of translation of said cylindrical support in said main and second treating zones are perpendicular.
Claim 7
Dependent Claim
30 words
A tunnel kiln as claimed in claim 1 and further comprising means for subjecting said main and second treating zones to specified atmospheres by flows of gas having different compositions.
Claim 8
Dependent Claim
92 words
A tunnel kiln as claimed in claim 1 and further comprising: a. means defining a third treating zone; b. means in said third treating zone for moving said cylindrical supports in a direction parallel to their longitudinal axes; c. a second chamber connecting said main treating zone to said third treating zone, said second chamber being adapted to receive at least one of said cylindrical support at a time; and d. means for isolating said second chamber in a gas-tight manner from either said main treating zone or said third treating zone.
Claim 9
Dependent Claim
30 words
A tunnel kiln as claimed in claim 1 and further comprising longitudinal means for spacing said cylindrical supports apart during their translational movement in said second and third treating zones.
Claim 10
Dependent Claim
54 words
A tunnel kiln as claimed in claim 8 and further comprising seal rings mounted on the internal surface of said second treating zone so as to contact the external surface of said cylindrical support, said seal rings being arranged in pairs the spacing of which is greater than the length of said longitudinal means.
Claim 11
Dependent Claim
45 words
A tunnel kiln as claimed in claim 1 wherein each of the cavities in said cylindrical supports is shaped to receive a single cylindrical product the longitudinal axis of which is parallel to the longitudinal axis of the cylindrical support in which it is received.
Claim 12
Dependent Claim
37 words
A tunnel kiln as claimed in claim 1 and further comprising means for keeping the cylindrical surfaces of adjacent cylindrical supports from coming into contact with each other during their translational movement in said main treating zone.
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |