Printed circuit layout means

Claim 2

A printed circuit layout assembly comprising: a grid sheet having mutually perpendicular grid lines; a transparent circuit layout sheet to be placed in face to face contact with either side of said grid sheet; said sheets having preformed locating holes which are arranged to register with one another when said sheets are placed face to face in registered relation in such manner that each hole in said grid sheet and the corresponding hole in said layout sheet provide a pair of aligned holes; locating discs to be positioned within said hole pairs, respectively, for locating and retaining said sheets in said registered relation to permit layout on the exposed side of said layout sheet of a printed circuit diagram defining conductors located in predetermined relation to said grid lines; and said locating discs having a thickness approximately equal to the combined thickness of said sheets, such that said discs may be placed in said grid sheet holes with either end of said discs projecting beyond the adjacent side of the grid sheet to locate said layout sheet relative to The respective grid sheet side without removing said discs from said grid sheet.

Claim 3

A printed circuit layout assembly comprising: a grid sheet having mutually perpendicular grid lines; a transparent circuit layout sheet to be placed in face to face contact with either side of said grid sheet; a second transparent circuit layout sheet to be placed in face to face contact with the opposite side of said grid sheet; said sheets having preformed locating holes which are arranged to register with one another when said sheets are placed face to face in registered relation in such manner that the sheets have sets of aligned holes; locating discs to be positioned within said aligned hole sets, respectively, for locating and retaining said sheets in registered relation to permit layout on the exposed sides of said layout sheets of printed circuit diagrams defining conductors located in predetermined relation to said grid lines and to one another; and said locating discs having a thickness approximately equal to the combined thickness of said sheets, such that said discs may be placed in said grid sheet holes with the ends of discs projecting beyond the adjacent sides of said grid sheet to locate said layout sheets relative to said grid sheet.

Claim 4

A printed circuit layout assembly comprising: a grid sheet having mutually perpendicular grid lines; a transparent circuit layout sheet to be placed in face to face contact with either side of said grid sheet; a second transparent circuit layout sheet to be placed in face to face contact with the opposite side of said grid sheet; said sheets having preformed locating holes which are arranged to register with one another when said sheets are placed face to face in registered relation in such manner that the sheets have sets of aligned holes; locating discs to be positioned within said aligned hole sets, respectively, for locating and retaining said sheets in registered relation to permit layout on the exposed sides of said layout sheets of printed circuit diagrams defining conductors located in predetermined relation to said grid lines and to one another; and said locating discs having a thickness approximately equal to the combined thickness of said sheets, such that said discs may be placed in said grid sheet holes with the ends of discs projecting beyond the adjacent sides of said grid sheet to locate said layout sheets relative to said grid sheet.

Claim 5

A printed circuit layout assembly according to claim 1 including: means for releasably retaining said locating discs in their respective locating holes.

Claim 6

A printed circuit layout assembly according to claim 1 wherein: said locating discs are adapted to be positioned within said layout sheet holes with a surface of each disc substantially flush with said exposed side of said layout sheet, said surface of each locating disc has a reference mark, said layout sheet is adapted to be photographed after completion of said circuit diagram with said locating discs in their flush positions within said layout sheet holes to provide a photographic image of said circuit diagram and reference marks, and the distances between the reference marks on said photographic image are adapted to be measured to check the scale of said image.

Claim 7

A printed circuit layout assembly according to claim 4 wherein: said reference marks comprise crossed lines on said discs, and said discs and sheet holes have complementary noncircular shapes for orienting said discs in their respective holes in positions wherein said crossed lines parallel said grid lines, respectively.

Claim 8

A printed circuit layout assembly according to claim 2 wherein: said locating discs are adapted to be positioned within said layout sheet holes with a surface of each disc substantially flush with said exposed side of said layout sheet, said surface of each locating disc has a reference mark, said layout sheet is adapted to be photographed after completion of said circuit diagram with said locating discs in their flush positions within said layout sheet holes to provide a photographic image of said circuit diagram and reference marks, and the distances between the reference marks on said photographic image are adapted to be measured to check the scale of said image.

Claim 9

A printed circuit layout assembly according to claim 6 wherein: said reference marks comprise crossed lines on said discs, and said discs and sheet holes have complementary noncircular shapes for orienting said discs in their respective holes in positions wherein said crossed lines parallel said grid lines, respectively.