| 摘要 |
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 which includes an indexing drum having notches therein with spacing therebetween corresponding to the predetermined coded spacing of the key to be duplicated. A blank key is firmly secured in a predetermined position on the housing and movable in a direction toward a grinding wheel. The indexing drum is indexed corresponding to the predetermined coded spacing between the notches of the key to be duplicated and the blank key is moved into cutting engagement with the grinding wheel. The depth of the cut made by the grinding wheel on the blank key is indicated on the card by a pointer pivotally secured in the housing and the spacing between the notches is determined by the drum operatively engaging an index pin which conformably fits into selected spaced notches on the drum. The pointer is moved across the sequential index on the card to indicate the depth of cut. The same angle of cut of the notches in the key being duplicated may also be cut in the blank key. When duplicating a key that is already a duplicate of a preceding duplicate or original key wherein deviations from the original coded depth may be present, the original coded depth of the key it is desired to duplicate may be determined before duplicating a key therefrom so that the duplicated key is more accurate than the key from which the duplicate was made.
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