Unitary die-cast assembly for electronic circuits

• US 4,313,025 A
• Filed: 06/04/1980
• Issued: 01/26/1982
• Est. Priority Date: 06/04/1980
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Grube, Franklin F. Jr.
• Primary Examiner(s): Reynolds, B. A.
• Assistant Examiner(s): TONE, DAVID
• Application Number:
  US06/156,296
• Time in Patent Office: 601 Days
• Field of Search: 220/305, 220/22, 174/35 R, 174/35 MS, 174/50, 174/52 R, 361/424, 165/135, 188/1 B
• US Class Current: 174/50
• CPC Class Codes: H05K 5/03 Covers
• CPC Class Codes: H05K 5/04 Metal casings
• CPC Class Codes: H05K 7/00 Constructional details common to different types of electric apparatus casings, cabinets, drawers H05K5/00

Abstract

A unitary die-cast for housing electronic circuits includes one or more compartments or cavities adapted to receive a circuit boards therein. A compartment with a cavity includes a post centrally located in the bottom and extending upwardly in the middle of the cavity. A fastening device, such as a screw, is used to forcibly affix a rigid but flexible cover onto the housing at the center post. The cast and the cover are made of electrically conductive but acoustically dampening material. When the cover is forcibly affixed to cover the cavity, the cover and the chassis provide an acoustically and microphonically dampened housing for the circuit placed therein. The cast includes a wall separating the compartments, and the wall has a cavity along the length thereof and substantially co-extensive therewith for providing a thermal separation between the compartments whereby the wall acts as a thermal insulator.

Claims

1. An assembly housing for electronic circuits, the assembly comprising a unitary die-cast, said unitary die-cast having at least a pair of compartments, each for receiving a circuit board, the two compartments being partitioned by a wall, said wall having a channeled cavity for providing a thermal separation between the two compartments whereby said wall acts as a thermal insulator, at least one of said compartments forming a housing with a cavity for receiving a circuit board therein, said housing being made of a rigid and a highly acoustically dampening material, a cover adapted to cover said housing and enclose the cavity, said cover being a rigid but flexible material, and means for forcibly fastening the cover to the housing through an aperture situated substantially at the center thereof, said fastening means comprising a center tap post positioned substantially in the center of the cavity, said post being an integral part of the die-cast, and a threaded screw adapted to fasten said cover forcibly onto the housing through a tap in the center of the cover so that the force applied to the cover by the tightened screw applies pressure onto the cover whereby the pressure applied to the cover causes the cover to apply lateral and downward pressure to provide microphonically enclosed and dampened housing for said circuit board.