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US 3,939,564 AGranted
Adjustable grid line device
OwnerSr.; Walter V. Slawinskiinventor
Life of this patent
Estimating the term…
Abstract
This device consists primarily of parallel spaced apart bars which through brackets, bolt, spring and wingnut fastenings will adjust to adapt to a painting canvas, the parallel members having equally spaced apart slot means in which will be received thread so as to form grid lines for the purpose of copying, enlarging or decreasing photographs, paintings, pictures, plans and the like from one area to another.
Claims1
An adjustable grid line device comprising:
- a frame including two pairs of parallel spaced apart bars, each having an L-shaped cross-section and each having a plurality of equally spaced apart notches along the edges thereof corresponding to the outer peripheral edge of the frame;
- means for adjustably connecting the bars for the expansion and contraction of the frame comprising L-shaped brackets each fixedly secured on one outside face to one of the bars and means securing each bracket on the other outside face to an adjacent bar comprising a bolt fastener, means defining an elongated slot in the adjacent bar freely and slideably receptive of the bolt, a winged nut fastener engaged with the bolt fastener and spring means cooperative with the bolt fastener for urging the bracket against the adjacent bar;
- thread means received in said notches on the oppositely opposed bars to form grid lines for the enlarging, reducing or copying of pictures;
- and a pair of parallel spaced apart spring clips receptive of a canvas therebetween and fixedly secured to the inside corners of each bracket.
1 more element
Dependencies are inferred from the claim text.