RUGGED MODULAR PC 104 CHASSIS WITH BLIND MATE CONNECTOR AND FORCED CONVECTION COOLING CAPABILITIES

• US 20040100767A1
• Filed: 11/25/2002
• Published: 05/27/2004
• Est. Priority Date: 11/25/2002
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Canter, Donald C., Watts, Michael A.
• Granted Patent: US 6,760,220 B2
• Time in Patent Office: Days
• US Class Current: 361/690
• CPC Class Codes: H05K 7/1408 by a unique member which latches several boards, e.g. locking bars
• CPC Class Codes: H05K 7/1412 hold down mechanisms, e.g. avionic racks

Abstract

A chassis for circuit cards has a housing, a front end, a connector end, and a top cover. The housing has an airflow slot on its underside, and the top cover is open in nature, the combination of which allows the flow of forced convection air from top to bottom (or vice versa) to cool the circuit cards. The connector end has alignment pins which assist in blind mating of the chassis in difficult to access areas. Stabilizer rods, spacers and spacer brackets, made from stainless steel, hold the circuit cards in place and protect them from shock, vibration, and other trauma. The front end has a jacking type screw which enables one to exert sufficient pressure so that the greater than 200 I/O pins at the connector end are easily forced into receiving sockets.

Claims

1. A chassis for circuit cards comprising:

a housing;

a top cover attached to said housing;

a front face attached to a front end of said housing;

a connector end attached to a back end of said housing;

a stainless steel stabilizer rod connected at a first end to said front face and connected at a second end to said connector end;

one or more stainless steel spacers positioned on said stabilizer rod; and

one or more stainless steel stabilizer brackets positioned on said stabilizer rod;

wherein said front face comprises;

a jacking type screw; and

one or more moment pins;

wherein said connector end comprises;

a connector alignment pin;

a shear alignment pin;

I/O connectors; and

a pin guard;

wherein said top cover comprises;

two longitudinal braces; and

one or more transverse guards;

and wherein said housing comprises an air flow slot on an underside of said housing.

2. The chassis for circuit cards according to claim 1, wherein said circuit cards are manufactured according to a PC 104 standard.

3. The chassis for circuit cards according to claim 1, further comprising rubber padding positioned below said top cover and between said circuit cards and said housing.

4. The chassis for circuit cards according to claim 1, further comprising a cable routing space positioned between said circuit cards and said housing.

5. The chassis for circuit cards according to claim 1, wherein said stabilizer rod penetrates said circuit cards, thereby forming a circuit card stack.

6. The chassis for circuit cards according to claim 1, wherein said chassis is inserted into an aircraft system.

7. The chassis for circuit cards according to claim 1, wherein said chassis is inserted into a rocket launching system.

8. The chassis for circuit cards according to claim 1, wherein forced convection air circulates between said top cover and said airflow slot.

9. The chassis for circuit cards according to claim 1, wherein said chassis and circuit cards are able to withstand a vibration load of random 11 g-rms for about 90 seconds.

10. The chassis for circuit cards according to claim 1, wherein said chassis and circuit cards are able to withstand shock loads of 160 g vertical and 100 g lateral.

11. The chassis for circuit cards according to claim 1, wherein the temperature within said circuit card stack does not exceed 70°

C. in a 50°

C. operating environment.

12. The chassis for circuit cards according to claim 1, wherein forced convection air is circulated through said chassis and between said circuit cards, and further wherein said air is removed from said chassis and cooled in a heat exchanger.

13. The chassis for circuit cards according to claim 1, wherein said connector alignment pins and said shear alignment pins allow blind mating between said I/O connectors and a receiving unit.

14. The chassis for circuit cards according to claim 1, wherein said jacking type screw allows sufficient pressure to be applied to said chassis for said I/O connectors of said chassis to mate with a receiving unit, and further wherein said moment pins prevent said chassis from deviating from a proper line of installation.

18. A process to protect circuit cards from shock, vibration and temperature trauma using a circuit card as described in claim 1, comprising the steps of:

inserting said circuit cards into said chassis;

placing said chassis into a receiving unit;

aligning said chassis with said unit with the aid of one or more alignment pins disposed on said chassis; and

forcing said chassis into said receiving unit via a jacking type screw.

19. The process to protect circuit cards according to claim 18, wherein said circuit cards are manufactured according to a PC 104 standard.

15. A chassis for circuit cards comprising:

a housing;

a top cover attached to said housing;

a front face attached to a front end of said housing;

a connector end attached to a back end of said housing;

means to physically connect each circuit card to another circuit card; and

means to connect said circuit cards to said front face and said connector end;

wherein said front face further comprises means to install said chassis such that at least 200 I/O connector pins may be forced into a receiving unit;

wherein said connector end further comprises means to align said chassis in a blind mating installation;

and further wherein said top cover and said housing comprise means to permit the flow of forced air convection to maintain the temperature surrounding said circuit cards.

16. The chassis for circuit cards according to claim 15, wherein said circuit cards are manufactured according to a PC 104 standard.

17. The chassis for circuit cards according to claim 15, further comprising means to cushion said circuit cards from vibration and shock trauma.