US 1084745 A
Description (OCR text may contain errors)
op?. LINDSAY. i ELECTRIC PRIMER. APPLICATION FILED SEPT. 8, 1913.
. 745 A Patented Jan. 20, 1914.
INVENTOI? UNITED sTATEs PATENT orrion CHARLES F. LINDSAY, OF FAIRFIELD, CONNECTICUT, ASSIGNOB. TO THE UNION METALLIC CARTRIDGE COMPANY, OF BRIDGE'ORT, CONNECTICUT, CORPO- IRAJIIO- F CONNECTICUT.
Specieation of Letters Patent. v
Patented Jan. 2.0, 1914.
Animation mea septeinber s, ma. semi no. nasca.
To all 'whom 'it may concern:
Be it known that I, CHARLES F. LINDSAY, a subject of the King of Great Britain, residing at Faireld, county of Fairfield, State of Connecticut, have invented an Improvement in Electric Primers, of which the following is a specification.
This invention has for its obiect to prol vide an inexpensive and greatly improved electric primer so constructed that all pressures exerted in the primer tend to tighten -up the parts making it absolutely gas tight,
With these and other objectsin vievv I .have devised the novel electri primer Which I Will now describe referring to the accom` panying drawing forming a part of this specification and using reference characters to indicate the several parts.
Figure l is a vievv of one form of my novel primer in longitudinal section; Fig. 2 a vievvvof the connecting Wire detached; and Fig. 3 is a- View partly in elevation and partly in longitudinal section, illustrating a slightly variant form of the invention.r`
10 denotes the shell which is drawn from sheet metal and is provided with a head 11 having a central opening 12.
13 denotes the contact butt-on which lies flush With theouter face of the head of the shell and the inner end of which is provided Wit-h a head 14 of greater diameter than the opening in the head of the shell and prefer-v ably, although not necessarily, provided With a recess 15, and 16 is a Washer in electrical contact With the shell and having an opening 17. Between the contact button and the contact Washer gun cotton or some other explosive, indicated by 18, is placed, the explosive being shown as filling the recess in the contact button and extending through the opening in the contact Washer. The contact button' is separated and insulated from the head and Wall of the shell and also from the contact Washer by means of insulating rings 19 .and 20, said rings being formed to a. suitable shape in 'cross section to correspond with the shape of the contact button and to permit them to drop to place readily in assembling. Contact ring 19 fills the space between the contact button and the wall of opening 12 in`A the head of the shell and'also separates the head of the c ontact button from the head ofthe shell, and insulating ring 20 separates the head of the contact button from the Wall of the shell and also separates the head of the contact button from the contact Washer. The electrical circuit is completed and the explosive is ignited by means of a Wire 21 which passes diagonally through the explosive and lies in close contact with the Contact button and the contact washer.y
The forms illustrated inl Figs. 1 and 3 differ only in the shape ofthe insulating rings and in the interposition between the insulating ring or rings and the wall of the shell of a'metallic Sleeve, indicated by 22, nflhiltlzh extends forward from the head of the s e In assembling, when sleeve 22 is used, the
insulating rings, contact button, sleeve, explosive, connecting Wire and contact washer may be assembled in the shell and then the end of the sleeve may be crimped down ont-he contact Washer as at 23, in Fig. 1 and then the parts are locked in place by indenting the shell or by rolling a circumferential groove 34 therein,.or if preferred, sleeve 22 mayv first be crimped and the parts of the primer placed therein and then inserted in the shell, after which the shell is indented o1' the groove is rolled therein as before.
In the form illust-rated in Fig. 3, the parts comprising the primer are assembled in the shell as irst described, with the exception that the sleeve is omitted, after which the groove is rolled in the shell to lock the electrical parts of the primer in place. In either form, it should be noted that the electrical parts of the primer are securely locked in'place, at the back by the head of the shell and at the front by indentations or the rolled in groove. The groove holds the electrical parts against forward movement. when engaged by the electric firing pin of 'a gun and the head of the shell holds' said parts against backward movement under the pressure of the gas generated Within the primer and causes the insulating rings, and the metallic sleeve if used, to make the primer absolutely gas tight, which is a vitally important feature of the invention.
The primer is completed by nearly filling the shell with rifle powder or some other eX- plosive, indicated by 25, placing over the rifie powder a Wad 26 and then crimping the end of the shell as at 27. In firing, the current passes from the ring mechanism of the gun to the contact button, thence through the wire to the contact washer and ignites the gun cotton, the flame of which passes through the opening in the contact washer and ignites the riie powder, which in turn ignites the explosive of the'shell in which the primeris used, which is not illustrated as it forms no portion of the present invention. y
Having thus described my invention I claim:
1. In a structure of the character 4de-1 scribed, the combination with a shell' hav- `ing a head with a central opening, of a conwall of the opening, a contact washer, an explosive between said button and washer, a bridge wire passing through the explosive and connecting said button and washer, and an indentation in the shell whereby the parts are locked between said indentation and the head of the shell.
2. Ina structure of the character described, the combination with a shell having a head with a central opening, of an insulated contact button seated in saidv opening and having a head of greater diameter than t-he opening, a contact washer, a sleeve-abutting against the head of the shell and forth, an explosive between said button' and washer, a bridge wire passing through the explosive and connecting said button and ncrimped over the washer, for the purpose set Washer, -and an indentation in theshellv whereby the parts are locked between said indentation and the head of the shell.
In testimony whereof I aix my signature in presence of two Witnesses.
CHARLES F. LINDSAY. Witnesses:
WM. H. SKINNER,
GEO. T. WURM.