Metal working – Means to assemble or disassemble – Means to disassemble electrical device
Patent
1991-06-28
1993-07-06
Gorski, Joseph M.
Metal working
Means to assemble or disassemble
Means to disassemble electrical device
29239, B23P 1900
Patent
active
052242633
ABSTRACT:
A package extraction tool (10) removes package (12) from socket (14) of circuit board (16). The tool (10) consists of a cylinder (18) and a piston assembly (20). Port (24) that is used to evacuate the cylinder (18) after the piston (20) is inserted in, the cylinder (18). The piston assembly (20) splits symmetrically into two halves (26) and (28) along its major axis. On one end (32) of the piston (20), there is an undercut pocket (34) to grab around the edges (36) of the package (12) and seal on flat edge (38) of pin side (40) of the package (12). A small port (42) connects the two ends (32) and (33) of the piston (20) with a controlled leak. Piston (20) fits into the cylinder (18) with a slight clearance. Leakage is controlled by the piston (20 )/cylinder (18) clearance. In use, the piston halves (26) and (28) are separated far enough to allow them to be reassembled around the package (12). The cylinder (18) is placed over the piston (20), and vacuum applied. The controlled leaks between the piston (20) and the cylinder (18) and between the two ends (32) and (33) of the piston are small enough that the piston (20) begins to move upward. When the undercut pocket (34) seats against the underside (40) of the package (12), a seal is initiated. The vacuum above the piston (20) increases, maintaining the seal at the package edges (36). When the combined upward forces at the edges (36) and on the body of the package (12) reach a critical value, the package pops loose.
REFERENCES:
patent: 3390446 (1968-07-01), Ettorre
patent: 4091519 (1978-05-01), Durgan
patent: 4894910 (1990-01-01), Reimer et al.
Digital Equipment Corporation
Gorski Joseph M.
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