Cutting – With means to convey work relative to tool station – With work-constraining means on work conveyer
Patent
1981-09-03
1984-09-04
Briggs, William R.
Cutting
With means to convey work relative to tool station
With work-constraining means on work conveyer
30131, 83693, 83917, B26D 510
Patent
active
044689942
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
In the field of key cutting machines, there are basically two distinct varieties for the purpose of cutting replacement keys. One of these varieties is broadly denominated as a "duplicator" which utilizes an existing cut key as a pattern for reproducing the same sequence of cuts on a suitable key blank. The other variety of key cutting machine can be broadly denominated as a "code cutter" which does not require an existing cut key as a pattern, but instead utilizes a key or lock number and coded key cuts information to establish settings on the machine which will provide the desired sequence of cuts on a suitable key blank. Both varieties can either be manually or power operated.
The present invention relates to the code cutting type of device.
BACKGROUND ART
In my prior U.S. Pat. No. 3,496,636 granted Feb. 24, 1970, entitled "KEY CUTTING MACHINE WITH PRESELECTED DEPTH GAUGING" and in my prior U.S. Pat. No. 3,633,451 granted Jan. 11, 1972, entitled "KEY CUTTING MACHINE WITH COORDINATED POSITIONING AND CUTTING MOVEMENTS", there are disclosed improved forms of code cutters which utilize a "readout" form of preselected depth gauging by means of which the entire code sequence of cuts for the key blank can be preset on the machine before any cuts are made.
With the advent of and trend toward lighter weight automobiles, the automobile manufacturers have progressively reduced the thickness of automobile doors so that the available space for the lock assembly for the doors has been considerably reduced. The lock manufacturers have accordingly found it necessary to reduce the length of the lock cartridge or mechanism. Correspondingly, the keys for these locks have been reduced in length and the customary uniform spacing between adjacent cuts on the key have also been reduced. As a consequence, the cuts on existing keys are often shallower than has been standard practice in the art, and the first cut on many keys is so close to the shoulder of the key that a cut of less than standard width has to be made, otherwise the shoulder itself would be eliminated by the cut. Inasmuch as the shoulder of the key is necessary to precisely limit the extent of insertion of the key in the lock for proper operation, any mutilation or cutting away of the shoulder of the key must be avoided. Furthermore, in making replacement keys, the shoulder serves as the reference point for the cuts to be made on the key, so it is necessary that the shoulder not be damaged during the course of the cutting operation on a replacement key.
In addition to the above-mentioned changes which have occurred in automotive locks and keys, there has also been a strong impetus toward improving the security of automotive locks and keys to prevent theft. This has resulted, for example, in double-edged keys and corresponding locks, as well as an increase in the number of tumblers or wafers with a corresponding increase in the number of cuts on the key. In the past, automotive keys ordinarily had five or six cuts. Presently, there are automotive keys that have as many as twelve cuts compressed into the same space which formerly accommodated five or six cuts.
The cutting of the original key by the automotive lock manufacturer poses no particular problem because the manufacturer can utilize specialized, high production key cutting tools and equipment for the mass production of the original keys. However, when replacement keys are required, automobile dealers and locksmiths do not have such single purpose equipment for key cutting, particularly code key cutting, and must utilize code key cutters of the type described in the foregoing patents and use interchangeable accessories to accommodate to different key cutting situations.
Thus, in the type of key cutting circumstance mentioned above, a locksmith attempting to use a code cutter to replace a lost key, would have to replace the standard cutting punch of the code cutter with a smaller punch to make the first cut on the key without damage to the shoulder of the key. After the first cut, the punc
REFERENCES:
patent: 3180196 (1965-04-01), Coulon et al.
patent: 3496636 (1970-02-01), Lieptz
patent: 3633451 (1972-11-01), Lieptz
Briggs William R.
Congoleum Corporation
Meier Lawrence
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