Patent
1976-07-08
1978-10-03
Simpson, Othell M.
76110, B23C 116
Patent
active
041177630
ABSTRACT:
Method and apparatus for decoding and duplicating a key wherein the notches in the shank of the key are coded to a predetermined coded depth and spacing therebetween. An index card having a sequential index thereon corresponding to the predetermined coded depth is inserted into a housing and the key to be duplicated is inserted into a slot in the housing where it engages an indexing member which enters one of the notches on the key and indicates on the card the coded depth of that notch. The angle of cut of the same notch may also be determined. The remaining notches of the key may be decoded in like manner. The same index card is then inserted into a housing associated with a grinding wheel. The depth of the cut made by a grinding wheel on the blank key is indicated on the card by a pointer pivotally secured in the housing.
In an alternate embodiment, the same index card is inserted into a housing and the position of the key to be duplicated is calibrated with respect to the grinding wheel. The blank key is located on the housing in a manner related to the coded spacing of the notch to be cut by a visual observation of a first pointer sweeping across the index card. The notch is then cut at the proper location on the key to the coded depth also determined by a visual observation of a second pointer sweeping across the index card. Sequential cuts are made in like manner.
REFERENCES:
patent: 548298 (1895-10-01), Darling
patent: 1750218 (1930-03-01), Falk
patent: 1886641 (1932-11-01), Caron
patent: 1923164 (1933-08-01), Roos
patent: 3807276 (1974-04-01), Oliver
patent: 3902382 (1975-09-01), Lieptz
Gartner Klaus W.
Simpson Othell M.
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