US146513A - Improvement in the manufacture of clock-keys - Google Patents

Description

a. d. cLAnK.

Manufacture of Cluck-Keys.

N0. 146,513. Patentedlan-20.l874

@f QQMW" print which projects from the cylindrical end U ITED STATES GEORGE D. CLARK, OF PLAINVILLE, CONNECTICUT.

IMPROVEMENT IN THE MANUFACTURE OF CLOCK-KEYS Specification forming part of Letters Patent No. 146,513, dated January 20, I874; application filed December 15, 1873.

To all whom it may concern:

Be it known that I, GEORGE D. CLARK, of Plainville, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in the Manufacture of Glock Keys, of which the following is a specification:

In the process'employed by me the coreof the key-pattern deviates from a cylindrical form, whereby the square cavity in the key is cast in a certain position relative to the flat handle, so that the square hole may be dressed by means of a punch, as hereafter more fully described.

In the accompanying drawing, Figure 1 is a side View of the key-pattern and the core. Fig. 2 is an end view of said core. Fig. 3 is a'front elevation of a key set under a punch and upon a bed in position for dressing out the square hole of the key, and Fig. 4 is an end View of the clock-key, and a top view-of the bed, all as employed in the manufacture of clock-keys in accordance with my inven-- tion.

Previous to my invention clock-keys have been made with the square cavity cast therein; but the holes varied so in size that it was, necessary to assort them over or dress out the holes. Assortin g them was quite laborious, expensive, and unsatisfactory.

. The core'print employed in casting these keys, and the part of the eoredesigned to rest in said prints imprint, were cylindrical, so that the square holes in the keys were formed at Various positions in relation to the handle, which variance rendered it impracticable to dress out the holes by machinery.

The part of the pattern which is above the line .10 w of Fig. 1, is the core-print A, and the remainder is the key-pattern proper. I form this coreprint A cylindrical for a short dis.- tance, but the bulk of its length I form square with the corners thereof in a certain position relative to the flat handle B. Other non-cylindrical forms will answer the same purpose, such as a triangle, rhombus, &c.

v The core O has one end of a corresponding size and shape to that of the core-print A, and the other end is the core proper, a, which will form the square hole in the key.

In all of the cores employed the square amust be set in certain and uniform position in relation to the noncylindrical part of the core 0.

A mold is made in the ordinary manner,

the pattern and core-print, Fig. 1, is withdrawn from the mold, and the core 0 is placed with its large end in the imprint of the print A. The mold is then filled, and as the square a of the core G can be set in only one position i in the mold it follows that the keys, when cast, will have the sides of the square hole always in a certain and uniform position relative to the handle B.

The core may and of any material known in the arts that will answer thepurpose.

A very good core is made of burnt sand and gum, as described in the patent of O. D. Hunter, September 16, 1873. 7

After the keys are cast, properly cleaned, and annealed, they are placed one by one upon a bed, D, Figs. 3 and 4, of a press which carries a reciprocating punch, b, of the size desired" to leave the hole in the key.

This bed I) is of such size that the key ring or handle B may he slipped over it, and it is provided with a cavity, 0, slotted upon two opposite sides, (see Fig. 4,) which slotted cavity receives the end of key shaft and portions of its flat handle, (see Fig. 3,) so as to l J 1 hold the key in a certain relation to the punch b as it descends into the key.

The hole in the key, as it is cast, is left so so small that the punch b will take a thin shaving upon each of its sides, and leave the holes in the finished keys smooth and of a uniform size.

Now, it will be seen that, if the holes. are

cast with their sides always in a certain posi tion relative to the handle, and the handle governs the position of the key when restin g in the bed D, the punch may be easily set so as to bring its sides parallel to the sides of the square hole in the key, and thereby PATENT @FFm A be formed in any manner goodworlgcan be rapidly done without dancasting the square hole in a certain position gel of breaking the punch or spoilingthe relative to the handle, and then dressing the keys. sides of the hole by means of a punch, all in A punch and bed similar to b I) have been the manner substantially as described.

before used for squaring round holes in clockkeys. GEO. I). CLARK.

I claim as my inveution- WVitnesses: I The improvement in the manufacture of WILLIAM S. OOWLY,

clock-keys herein described, consisting of first A. N. CLARK.

Images