US1792481A

US1792481A - Key die

Info

Publication number: US1792481A
Application number: US417580A
Authority: US
Inventors: Arthur L Carter
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-12-30
Filing date: 1929-12-30
Publication date: 1931-02-17
Anticipated expiration: 1948-02-17

Description

Filed Dec. 3o. 1929 A. L. CARTER KEY DIE LEE- Patented Feb. 17,

UNITED STATES ARTHUR L. CARTER, or Kassie our, nissouztr- KEY DIE Application filed December 30, 1929. Serial No. 417,580.

My invention relates to devices used in the production. of key duplicates from blanks and one object is toprovide a device of this character which is of simple and inexpensive con- 5 struction and whereby duplicates may be quickly and accurately produced.

, A further object is to provide a device oi this character which may be used to advantage by locksmiths, managers of automobile 1 agencies, and others who frequently have occasion to duplicate keys which havebecome lost and the codes, indicating the cut of the tumbler notches, are known.

In order that the invention may be fully 15 understood, reference will now be had to the accompanying drawing, in which:

Fig. I is a detail perspective of the device.

Fig. 2- is a side elevation of the device with a key blank arranged therein preparatory to 20 having the initial notch cut in its margin.

Fig. 3 is a side elevation of the device with the. key blank arranged therein preparatory to having the second notch cut in its margin. Fig. 4 is a vertical sectional view of the device. 7

Fig. 5 is a detail perspective view of one of a plurality of spacing elements employed in carrying out the invention.

Fig. 6 is a side elevation of the key blank before any tumbler notches have been out in its bit.

Fig. 7 is a side elevation of the finished ke Fig. 8 is a vertical section of a modified form of the device.

Referring in detail to the different parts, 2 designates one form of the device which consists of a rectangular body portion 3 provided at two opposite margins with a suitable number of notches 4 and 6 which are intersected by

parallel slots

8 and 10, respectively, extending through said body portion 3. The notches a and 6 may be of equal depth, or they niay'vary in depth as shown by Figs. 1 to 4, inclusive, to correspond with the notches of akey or keys which are to be duplicated.

For the convenience of'the user the notches 4; and6 are designated with symbols corresponding with the code or codesof the keys to be duplicated so that whena key of which thecode i's known has become losta duplicatecan be readily and quickly produced with the aid of my device. The symbols may be in any suitable form, but in the present instance I have shown them in the form of numerals 2 to 5,inclusive.

- Assuming that th'ecode calls for the use of all the notches in the order in which they areindicated in the drawing by the

code numerals

2, 3, 4 and 5, respectively, the operation as follows First the bitA of the key blank B is insertedin the left end of the slot 8 until checked by the bit shoulder C contacting with said. left end ofv the body 3.

When thus inserted, the upper margin of the bit projects into the notches indicated bythe code numerals2 and 3 so that theinitial notch can be accurately cut with a suitable tool such as a three cornered file operated in the notch spacing element 12, providedwith a slot 14,

is slipped over the bitA and back against the V shoulder C for the purpose ofjproperly positioning the bit A longitudinally within the device to receive. the second notch which is formed therein by operatingrthe file in the marginal notch bearing the code numeral 3. The partly completed blank is then removed from the slot 8 and a second spacing element 12 isslipped into position against the first spacing'element after which the device 2 is placed in a reverse position to bring the notches indicated bythe code numerals i and 5 uppermost, whereupon the remaining notches may be cut in the bit A in the manner above indicated.

' During the foregoing operations the key blank B may be held in one hand, or ina vise, leaving the device 2 free to be changed to dif ferent positions upon the bit A, and the operations above described can be varied to con form to the different codes of keys to be duplicated.

In some instances it is necessary to produce duplicate keys with notches on both of the longitudinal margins of the bit, so for this purpose I have provided the modified form of device disclosed by Fig. 8, in which 2a designates the device as a whole, 3a the body portion having a longitudinal slot 8a which communicates with the notches 4a in one margin and with the notches 6a in the opposite margin of the body 3a.

From the foregoing description it is apparent that I have provided a device of the character described which is well adapted for the purpose intended, and while I have shown two forms of the invention I reserve all rights to such other forms as properly fall within the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent, 1s:

1. A device of the character described consisting of a body portion having slots extending therethrough and each adapted to receive a key bit, notches in one margin of said body portion and intersecting one of said slots, and notches in another margin of said body portion and intersecting the other slot.

2. A device of the character described consisting of a body portion having a slot for the reception of a key bit, marginal notches in said body portion and communicating with said slot, and a spacing element adapted to be placed upon the bit and between a shoulder on the latter and the adjacent side of the body portion.

3. A device of the character described consisting of a rectangular body portion having a slot for the reception of a key bit, marginal notches in said body portion and communicating with said slot, and one or more spacing elements adapted to be placed upon the bit and between a shoulder on the latter and the adjacent side of the body portion.

4:. A device of the character described consisting of a body portion having parallel slots extending therethrough and each adapted to receive a key bit, notches in one margin of said body portion and intersecting one of said slots, and notches of different depths in another margin of said body portion and intersecting the other slot.

In testimony whereof I alfix my signature.

ARTHUR L. CARTER.