US722913A - Electric ignition device. - Google Patents

Description

PATENTED MAR. 17, 1903. N. SCHMITT 6r J KRANNICHIELDT.

ELECTRIC IGNITION DEVICE.-

APPLICATIONI'ILED FEB. 25.1902.

.N0 MODEL.

D I M ffm M I MM @Wa/ww,

- eUNITED STATES PATENT OFFICE.

NIKOLAUs sCHMITT AND JOHANN KHANNICHEELDT, on COLOGNE, GERMANY.

ELECTRIC IGNITION DEVICE.

SBECIFICATION forming part of Letters Patent N o. 722,913, dated March 1'7, 1903.

Application led February 25, 1902. Serial No. 95,623. (No model.)

of Cologne-on-the-Rhine, in the Kingdom of- Irussia, German Empire, have'invented new and useful Improvements in Electric Ignition Devices, of which the following is a specification.

The ignition devicewhich forms the subject of this invention consists of a short, thin,

these latter.

dat, and exible i nsulating-body, on oneV and the same surface of which two short, thin, at, flexible, and electrically-conductive strips are attached at a slight distance apart. By this arrangement the position of the poles can be conveniently and absolutely fixed with regard to each other and fracture of the priming or ignition wire is avoided. For multiple simultaneous firing these fuses are of great Value, as they can be constructed with absolute uniformity and there is no danger of the poles bein g displaced relatively to each other.

In the accompanying drawings, Figure 1 is a front elevation of a at insulating part provided with two metallic strips. Fig. 2 is a section on the line a; a: of Fig. 1. front elevation of a' modified constructional form. Fig. 4 is a front elevation of a fiat insulating part provided with two metallic strips and an incandescing wire connecting Fig. 5 is a front elevation of a modified constructional form. Fig. 6 is a corresponding side elevation. Fig. 7 is an upper plan View of the arrangement illus-V trated in Fig. 5, except that here the ends of the igniting-wires are not shown as twisted together. Fig. 8 is a front elevation, upon a larger scale, ot' a form of igniting device adapted for producing flash-lightsfor photographic purposes and the like. Fig. 9 is a section on the line y y of, Fig. 8. Fig. 10 is a longitudinal section through a complete igniting device provided with an outer casing and a spring-cap, and Figs. 11 to 15 illustrate further constructional forms of igniting devices in accordance with this invention.

The same letters of reference are employed to indicate like parts.

In Figs. 1 and 2', a is a rectangular insulat- Fig. 3 is av ing part, which is provided upon one of its sides with two strips b of metal foil or paper, which are stuck, stitched, or otherwise suitably attached thereto. These strips b terminate in points c, which come opposite each other and are separated by a small space. These points serve as poles for the electric discharge.

The constructional form represented in Fig. 3 differs from that described above only owing to a comparatively unimportant modication of the form of the covering-strips b and of the position of the points c.

The arrangement shown in Fig. 4 serves for the production of an incandescing igniter. Upon a Iiat insulating part ct are arranged two covering-strips b, running parallel one with the other, and these strips are connected by means of a fine incandescing wire d. This wire is attached to the strips b by means oi' beads of solder e. Figs. 5, 6, and 7 illustrate the manner of manufacturing an incandescing igniting device in which the incandescing wire is not soldered to the strips b. In this form of the device after providing the dat insulating part with the strips b the Wire d is wound around the insulating part, fitting in two opposite notches or recesses in the same, as shown in Fig. 5. The extremities of the wire d are then twisted together as tightly as possible, (see Fig. 6,) so as to draw them closely against the metallic strips. Of course the incandescing wire may be so arranged that it passes through two small holes formed in the insulating part ctand the strips b somewhat in the position in which the beads of solder c areshown in Fig. 4, the extremities being then twisted together.

When the insulating part has been provided with the strips in one or other of these manners and the incandescing wire attached, (when this is desired,) the igniting device g is completed byimmersion in a pastyintlammable mass. mable mass g a pulverulent iniammable mass may be employed. This is introduced into a small cap Z, Fig. 13, into which the insulating part carrying the conducting-strips is inserted. This cover or cap is then closed by means of a plug of wax stearine or the like Instead of this pasty inlaml IOO or by means of a cast block of sulfur or in any other suitable manner. Instead of arranging the iniiammable mass around one end of the insulating part ct it may be spread in grooves formed in the said part. Fig. 1l

shows a longitudinal groove of this kind between the strips b. Fig. l2 is a section on the line z z of Fig. 1l. Fig. 15 is a section on line z z' of Fig. 14;. In these two figures is shown an insulating part c, having a transverse groove formed therein after the application of the strips b. The iniiam mable mass is introduced into this groove.

In Figs. 8 and 9 is shown a modified form of igniting device and provided with a considerable quantity of infiammable material g. This contains magnesium powder or other material adapted for producing a dash-light suitable for photographic purposes, for visible signals on railways, or for the use of troops in the field. Such igniting devices are preferably provided with conducting-wires fn..

In Fig. 10 a complete igniting device is illustrated, in which the fuse is inserted in one end of a tube or casing h, and the charge is held in a spring-cap placed in the opposite end of said tube or casing or tube h, the cap being open at the end above the fuse.

What We claim, and desire to secure by Letters Patent of the United States, is-

l. An electric ignition device comprising in combination a short, thin, dat and iiexible strip of non-conductive material; short, thin, flat and exible strips of conductive material disposed at a short distance apart on one and the same surface of, and carried by, said nonconductive strip; a mass of combustible material provided between, and in contact with, said two conductive strips; and means to assist the passage of the electricity from one conductive strip to the other through said combustible mass; substantially as set forth.

2. An electric ignition device, comprising in combination a comparatively short, thin flat and iexible strip of nou-conductive material having a depression therein; comparatively short, thin, fiat and flexible strips of conductive material disposed on one and the same surface of, and on opposite sides of the depression in, said non-conductive strip; a

mass of combustible material provided between said two conductive strips; and means to assist the passage of the electricity from one conductive strip to the other through said combustible mass; substantially as set forth.

The combination in an electric ignition device of a comparatively short, thin, flat and flexible strip of non-conductive material; comparatively short, thin, fiat and iiexible strips of conductive material disposed at a slight distance apart on one and the same surface of said non-conductive strip; and a mass of combustible material provided between said two conductive strips; substantially as set forthf 4. An electric ignition device comprising in combination a short, thin, flat and iiexible strip of non-conductive material; short, thin, flat and fiexible strips of conductive material disposed apart on one and the same surface of said non-conductive strip; a priming mass connecting said conductive strips; means to assist the passage of electricity from one conductive strip to the other through said combustible mass; a sheath surrounding said strips of conductive and non-conductive materials and said priming mass; a protecting and supporting cast mass inside said sheath and surrounding said conductive and nonconductive strips and leaving the extreme head of said priming mass free; and a detonating composition placed in said sheath adjacent to the exposed head of said priming mass; substantially as set forth.

5. An electric ignition device comprising in combination a short, thin, iiat and iexible strip of non-conducting material; short, thin,

iiat and flexible strips of conductive material disposed apart on one and the same surface of said non-conductive strip; a priming mass connecting said conductive strips; means to assist the passage of electricity from one conductive strip to the other through said combustible mass; a sheath surrounding said strips of conductive and non conductive strips and said priming mass; and a protecting and supporting cast mass inside said sheath and surrounding said conductive and non-conductive strips and leaving the eX- treme head of said priming mass free; substantially as set forth.

b. An electric ignition device comprising in combination a short, thin,fiat and iexible strip of non-conductive material; short, thin, fiat and flexible strips of conductive material disposed at a slight distance apart on one and the same surface of said non-conductive strip; a mass of combustible material connecting said two conductive strips; means to assist the passage of electricity from one conductive strip to the other; and means to connect said conductive strips with a source of electricity, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

NIKOLAUS SCHMITT. JOHANN KRANNICHFELDT. Witnesses:

CHARLES LEsIMPLE, CARL SCHMITT.

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