Device for fastening together under pressure two pieces, one to the other
AssigneeBull SAS
InventorGerard Dehaine
Life of this patent
Estimating the term…
Abstract
A heat sink of a circuit package for high density integrated circuits is fastened by a spring element that has shape memory. The fastening is carried out in a manner so that the element can be easily removed for disassembly.
Claims32
A device for dissipating heat from an integrated circuit, comprising a first piece coupled to said integrated circuit, a second piece having a surface and an opposite face, the surface adapted to thermally engage said first piece for enabling heat dissipation away from the integrated circuit, means for urging the first and second pieces together in thermal engagement, the means comprising a removable spring with shape memory, the spring extending between said opposite face of said second piece and a support means removably connected to said first piece.
In a device for fastening together two pieces used with an integrated circuit, a method of fastening the two pieces together comprising the steps of, providing an element with shape memory and coupling the element between said pieces so as to apply pressure between the pieces to maintain the pieces in relative thermal engagement, said step of coupling including initially disposing the element between the pieces, cooling the element to compress the element, securing the element to at least one of said pieces and permitting the element to expand so as to apply pressure between the pieces to maintain the pieces in relative thermal engagement.
An arrangement comprising a first piece and a second piece having respective facing surfaces and opposite surfaces, and means for urging the first and second pieces together and comprising a spring with shape memory, extending between said opposite surface of the second piece and upper support means removably connected to said first piece to make the spring free of support and removable from the arrangement.
In a device for fastening together two pieces having facing surfaces and corresponding opposite surfaces, with one piece having removable support means over said opposite surface of the other piece, a method of fastening the two pieces together comprising the steps of removing said support means to allow passage of said spring, disposing the spring to be supported by said opposite surface of said other piece, cooling the spring to compress it, securing said support means to said one piece, and permitting the spring to expand so as to apply pressure between the pieces.
A device for fastening together two pieces having facing surfaces and corresponding opposite surfaces, comprising:
- a support means removably connected to one of the first pieces;
- a spring with shape memory extending between the opposite surface of the other of the pieces and the support means, the spring capable of being removed from the support means.
A method for fastening together two pieces having facing surfaces and corresponding opposite surfaces, comprising the steps of:
- providing one of the pieces with a removable support means disposed against the opposite surface of the other piece;
- providing the support means with a spring having shape memory;
- disposing the spring against the opposite surface of the other of said pieces;
- cooling the spring to compress it;
- securing said support means to said one piece by permitting the spring to expand so as to apply pressure between the two pieces and maintain them in engagement.
Dependencies are inferred from the claim text.