US3909679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cabinet and heat sink for amplifier components
Assignee: Rock Ola Manufacturing Corp
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Filing: 1974-11-07
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Granted: 1975-09-30
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Expires: 1994-11-07
Abstract
Abstract A solid state amplifier for automatic coin-controlled phonographs mounted within a dust sealed cabinet and comprising a cast aluminum chassis having one wall formed with heat convecting fins mounted over an opening in a rear wall of the cabinet such that the convector fins thereon are exposed to atmosphere exteriorly of the sealed cabinet and having heat emitting power transistors of the amplifier supported in thermally sealed chambers between a heat sink support for the transistors and the interior of the finned convector wall of the chassis to provide efficient convection cooling of the transistors while preserving the sealed integrity of the cabinet''s interior.
Inventors
- 👤 Ralph E Petri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:01
CPC Classifications
G; G07; G07F; G07F9/00; G07F9/10; H; H05; H05K; H05K7/00; H05K7/20; H05K7/2039; H05K7/20409
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
In an automatic coin-operated phonograph: a dust sealed cabinet for enclosing the working components of the phonograph, an electronic amplifier mounted within said cabinet and comprising a cast metal chassis having a major base wall formed with a plurality of spaced heat convector fins extending outwardly of one face thereof, said base wall having plural spaced wells opening inwardly of the opposite face thereof; means mounting said chassis over an opening in one wall of said cabinet such that said fins are exposed to atmosphere exteriorly of the cabinet while maintaining the sealed integrity of the latter''s interior, thermally conductive heat sink means supporting electronic components mounted on said chassis in thermal conductive relation with said base wall to enclose said wells therein, and plural power transistor means supported on said heat sink means, one enclosed within each of said wells, whereby the heat emission of said transistor means is effectively dissipated to the exterior of the cabinet by said chassis and convector fins.
Claim 2
Dependent Claim
164 words
In an automatic coin-operated phonograph: a dust sealed cabinet for enclosing the working components of the phonograph, an electronic amplifier mounted within said cabinet and comprising a cast metal chassis having a major base wall formed with a plurality of spaced heat convector fins extending outwardly of one face thereof, said base wall having plural spaced wells opening inwardly of the opposite face thereof; means mounting said chassis over an opening in one wall of said cabinet such that said fins are exposed to atmosphere exteriorly of the cabinet while maintaining the sealed integrity of the latter''s interior, thermally conductive heat sink means supporting electronic components mounted on said chassis in thermal conductive relation with said base wall to enclose said wells therein, and plural power transistor means supported on said heat sink means, one enclosed within each of said wells, whereby the heat emission of said transistor means is effectively dissipated to the exterior of the cabinet by said chassis and convector fins.
Claim 3
Dependent Claim
68 words
The combination of claim 1 wherein said heat sink means comprises a plurality of individual thermally conductive elongated metal members, each formed with a pair of elongated parallel spaced ribs extending outwardly of one wall thereof; said base wall having parallel spaced channels opening inwardly of its said opposite face adjacent said wells and receiving said ribs whereby to transmit heat to said base wall and convector fins.
Claim 4
Dependent Claim
39 words
The combination of claim 1 wherein said means for mounting said chassis over said opening comprises a mounting flange bordering said base wall and engaged with said one wall of the cabinet along the periphery of said opening thereon.
Claim 5
Dependent Claim
22 words
The combination of claim 1 and heat shield means mounted over said heat sink means for reflectively transmitting heat to said chassis.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |