§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3850501A Expired / Lapsed US ⏱️ 0.0 years remaining

Feedthrough electrical terminal for hollow liquid cooled shaft of a dynamoelectric machine

Assignee: General Electric Co
•
Filing: 1973-04-09
•
Granted: 1974-11-26
•
Expires: 1993-04-09
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The subject matter of this invention is a leakproof feedthrough electrical terminal for bringing leads out from the interior of a liquid cooled hollow shaft. The novel feedthrough terminal includes a lower female terminal member which has a cylindrical, internally threaded portion positioned in an insulating bushing located in an opening in the shaft wall. The cylinder has a tapered shoulder which cooperates with the bushing to provide positive sealing against leakage of the cooling liquid. An upper male terminal member has an externally threaded stud to engage the internally threaded lower cylinder and also includes a second threaded stud which projects beyond the shaft wall to receive a terminal lug. When the threaded stud of the upper terminal engages the internally threaded cylinder, the entire lower terminal moves upwardly and the tapered shoulder exerts a wedging action on the insulating bushing forcing it outward against the wall of the opening in the shaft thereby sealing the hole and preventing leakage of the cooling liquid. Consequently, the feedthrough terminal provides a liquid seal without use of potting compounds, is of separable construction so that the terminal is easily assembled and disassembled thereby making maintenance and repair of the components located in the hollow shaft simpler and less time consuming.

Inventors

  • 👤 J Butterfield
  • 👤 J Wenzel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 16:20
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/22; H02K5/225; H01; H01B; H01B17/00; H01B17/56; H01B17/58; H01R; H01R9/00; H01R9/16; H01R9/18; H02K11/00; H02K11/04; H02K11/042; H02K9/00; H02K9/19; H02K9/197; Y; Y10; Y10S; Y10S439/00; Y10S439/908

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 180 words
In a separable, feedthrough, electrical terminal for a hollow liquid filled shaft, the combination comprising: a. a liquid filled, hollow shaft, b. a passage means through the wall of the shaft, c. a cylindricAl, insulating, bushing member positioned in said passage means, d. a female terminal member positioned in said bushing and having a portion projecting into the interior of said hollow shaft and adapted to have a lead means connected thereto, the remaining portion of said female terminal member extending partially into the interior of said bushing, e. a male terminal member adapted to engage said female member and having a portion projecting outside of the shaft wall and adapted to have a lead means connected thereto, f. said female terminal member having a tapered shoulder portion which also extends partially into the interior of said bushing to exert a wedging action on said bushing when said male and female members are engaged thereby forcing at least a portion of said bushing outwardly against the wall of said passage to prevent leakage of the liquid out of said shaft.
Claim 2
Dependent Claim 180 words
In a separable, feedthrough, electrical terminal for a hollow liquid filled shaft, the combination comprising: a. a liquid filled, hollow shaft, b. a passage means through the wall of the shaft, c. a cylindricAl, insulating, bushing member positioned in said passage means, d. a female terminal member positioned in said bushing and having a portion projecting into the interior of said hollow shaft and adapted to have a lead means connected thereto, the remaining portion of said female terminal member extending partially into the interior of said bushing, e. a male terminal member adapted to engage said female member and having a portion projecting outside of the shaft wall and adapted to have a lead means connected thereto, f. said female terminal member having a tapered shoulder portion which also extends partially into the interior of said bushing to exert a wedging action on said bushing when said male and female members are engaged thereby forcing at least a portion of said bushing outwardly against the wall of said passage to prevent leakage of the liquid out of said shaft.
Claim 3
Dependent Claim 30 words
The feedthrough terminal according to claim 1 wherein said female member is internally threaded and said male member has an externally threaded member which engages the internally threaded female member.
Claim 4
Dependent Claim 36 words
The feedthrough terminal according to claim 2 wherein said female member comprises a cylindrical portion, the interior of which is threaded and the male member includes an externally threaded stud which engages the internally threaded cylinder.
Claim 5
Dependent Claim 57 words
The feedthrough terminal according to claim 3 wherein said male member has a shoulder and an externally threaded portion projecting therefrom, said male member engaging the rim of the cylindrical portion of said female member to insure current transfer across the rim and the shoulder rather than across the threaded portions of said male and female members.

References Cited (Backward Citations)

US371161A Cited
US2245918A Cited
US2682570A Cited
US2716737A Cited
US2949551A Cited
US3213685A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-11-25 1978-05-27 1978-11-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-11-25 1982-05-27 1982-11-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-11-25 1986-05-27 1986-11-26 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag