Work holders – Work-underlying support – Support mounting means
Patent
1988-11-30
1991-09-10
Watson, Robert C.
Work holders
Work-underlying support
Support mounting means
B23Q 106
Patent
active
050467077
ABSTRACT:
The datum line establishing tool provides an improved method for deriving an accurate datum line on Printed Circuit Boards (PCB) and other similar assemblies without the need for having close tolerance PCB index holes and base tool pins. The datum line establishing tool includes a tool base and a spherical pin assembly (consisting of a sphere attached to a pin base); and a cylindrical section pin assembly (consisting of a cylindrical section to a second pin base); and a compression spring assembly. The two pin assemblies are inserted into their respective tool base cavities and are held in place with an upward bias by the compression spring assembly against the cavity flange. An improved method is disclosed by deriving an accurate datum-line on printed circuit boards (PCB) without the need for having close tolerance index holes and corresponding index pins. The process comprises the steps of placing the index holes of a PCB over two pin assemblies. One of the pin assemblies is a sphere design and maintains the PCB accurately and firmly in the "Y" plane. The other pin assembly is non-spherical in design and it maintains the PCB in the "X" plane. Once the PCB is stationed over the index holes it is clamped into place.
REFERENCES:
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patent: 3713944 (1973-01-01), Dennis et al.
patent: 4058890 (1977-11-01), Pierce et al.
patent: 4586702 (1986-05-01), Chambers
patent: 4610020 (1986-09-01), La Fiandra
patent: 4699364 (1987-10-01), Birjvkov et al.
patent: 4934680 (1990-06-01), Schneider
Auton William G.
Singer Donald J.
The United States of America as represented by the Secretary of
Watson Robert C.
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