US3809846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction heating coil for a zone heating process
Assignee: Siemens AG
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Filing: 1973-03-22
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Granted: 1974-05-07
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Expires: 1993-03-22
Abstract
Abstract An induction heating coil which is detachably mounted on a holding member of an induction heating device having a chamber receiving at least a portion of the coil, which device is adapted for use in a process of zone melting of a rod of material, characterized by the coil comprising a tube of insulating glasslike material, such as glass or quartz, which is both heat resistant and vacuum-tight, receiving a metal conductor therein. Each end of the coil is provided with an intermediate member of a good conducting material which member is electrically connected to the conductor and is sealed in a vacuum-tight relationship with both the tube of the coil and the holding member of the device. Preferably, a cooling agent such as water is circulated through the tube to cool the metal conductor during a heating operation. To form the seal with the intermediate member, the tube is either provided with a metalized end that is soldered to the intermediate member or the intermediate member is provided with a ring of silicon rubber which is compressed between the tube and intermediate member by an appropriate clamping device.
Inventors
- 👤 W Baumgartner
- 👤 W Keller
- 👤 M Schnoeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:57
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
181 words
An induction heating coil having at least one turn, which coil is adapted for detachably mounting on a coil holding member of an induction heating device which has a chamber receiving at least a portion of the coil, the device being adapted for performing a process of zone melting of a rod of material in a protective atmosphere, the coil comprising a metal conductor of at least one turn and a heat resistant and vacuum-tight insulation member surrounding the metal conductor, said insulation member being a tube of glass-like material bent into the form of the coil and the metal conductor being at least one wire inserted into the bent tube, each end of said coil having a metal intermediate member which is attached to the conductor and the insulating member, each of said metal intermediate members having means for forming a vacuum-tight connection with the coil and forming a vacuum-tight connection with the holding member, and each of said intermediate members having a passage in alignment with the tube to enable passage of a cooling agent around the metal conductor.
Claim 2
Dependent Claim
181 words
An induction heating coil having at least one turn, which coil is adapted for detachably mounting on a coil holding member of an induction heating device which has a chamber receiving at least a portion of the coil, the device being adapted for performing a process of zone melting of a rod of material in a protective atmosphere, the coil comprising a metal conductor of at least one turn and a heat resistant and vacuum-tight insulation member surrounding the metal conductor, said insulation member being a tube of glass-like material bent into the form of the coil and the metal conductor being at least one wire inserted into the bent tube, each end of said coil having a metal intermediate member which is attached to the conductor and the insulating member, each of said metal intermediate members having means for forming a vacuum-tight connection with the coil and forming a vacuum-tight connection with the holding member, and each of said intermediate members having a passage in alignment with the tube to enable passage of a cooling agent around the metal conductor.
Claim 3
Dependent Claim
18 words
An induction heating coil according to claim 1, wherein the tube of glass-like material is a glass tube.
Claim 4
Dependent Claim
18 words
An induction heating coil according to claim 1, wherein the tube of glass-like material is a quartz tube.
Claim 5
Dependent Claim
23 words
An induction heating coil according to claim 1, wherein the metal conductor is a plurality of wires arranged to form a single strand.
Claim 6
Dependent Claim
16 words
An induction heating coil acCording to claim 4, wherein the plurality of wires are silver wires.
Claim 7
Dependent Claim
16 words
An induction heating coil according to claim 4, wherein the plurality of wires are copper wires.
Claim 8
Dependent Claim
38 words
An induction heating coil according to claim 1, wherein the cooling agent is water, and wherein the means forming a vacuum-tight connection also forms a water-tight connection with both the holding member and the tube of the coil.
Claim 9
Dependent Claim
55 words
An induction heating coil according to claim 1, wherein each end of the metal conductor is soldered to the intermediate member which is made of a good conducting material and wherein the means forming the vacuum-tight connection between each end of the tube of glass-like material with the intermediate piece utilizes a silicon rubber seal.
Claim 10
Dependent Claim
74 words
An induction heating coil according to claim 8, wherein the intermediate member has a recess for receiving an end of the tube of glass-like material and wherein the silicon rubber seal is disposed between the end of the tube of glass-like material and the recess and wherein the means for forming a vacuum-tight connection includes means for compressing the silicon rubber seal into tight engagement between the recess and the tube of glass-like material.
Claim 11
Dependent Claim
46 words
An induction heating coil according to claim 9, wherein the recess of the intermediate member is provided with internal threads and wherein the means for compressing comprises a bushing received on the end of the tube and having external threads adapted to engage the internal threads.
Claim 12
Dependent Claim
66 words
An induction heating coil according to claim 9, wherein the external surface of the intermediate member adjacent the recess is provided with external threads and wherein the means for compressing comprises a sleeve nut surrounding the end of the tube having a sleeve portion for applying pressure to the silicon seal and an exterior sleeve which is threadably received on the threads of the intermediate member.
Claim 13
Dependent Claim
47 words
An induction heating coil according to claim 1, wherein means forming a vacuum-tight seal between the insulation member and the intermediate member comprises the ends of the tube of glass-like material being metalized and the metalized ends being connected to the intermediate member by a solder connection.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |