US1286891A - Ignition apparatus. - Google Patents

Description

1. I. CRABTREE IGNITION APPARATUS.

APPLICATlON FILED MAR. 11. I917.

Patented Dec. 3, 1918.

2 SHEETSSHEET I.

INVENTOR Jam .17 'a'mbfree,

J. I. CRABTREE.

IGNITION APPARATUS.

APPLICATION FILED MAR. 11. I912.

. Patented Dec. 3, 1918.

2 SHEETSSHEET 2.

FIE-5 INVENTOH Jb/i/l I Gmbfre z m: mums rrrln m, ma'mumn. wmmm, n 4

foa s seams JOHN. I. cnnntrnnn, 0F, noci nsrnn, new YonKfAssIcnon T0 EASTMAN KODAK,

' COMPANY, onnoonnsrrnn, new YORK, A CORPORATION on new YORK.

IeNITIon' Arrnnririfs.

To all whom it may concern: H v

Be it known that I, J OHN I. GRABTREE, a subject of the Kin of Great Britain, residing in Rochester, 1n the countyoflMonroe and State of New York, have inventedcertain new and useful Improvements in Ignition Apparatus; and I do hereby-declare the following to .be a full, -clear,-and exactdescription of the same, referencebeing had to theaccompanying drawings, forming a part of this specification, and to-Zthe reference numerals marked thereon. s

' This invention relates to: electrical.igni-v tion apparatus, and more particularly to ignition apparatus of the type in which the ignition element is removable and renewable. It is my object; to provideiassimple -and cheap igniter in which reliable electrical,

contact'willalways bev obtained between the electrical ignition element, such as a fuse,

and the cooperating electric circuit 'terni- 5 nals; in which the ignition element and the comb-ustible element, such asfflash-powder,"

may 'be quickly, conveniently, and safely renewed; in which the ignition will occur with certainty and yet premature ignition will'be prevented; and in which the parts areso a1 ranged that a pluralityof :igniters may be connected together for simultaneous ignition of separate combustible elements. jects will hereinafterappear.

While I shall describe the preferred embodiment of my invention as applied to the ignition of photographic flash-powders, it will be understood that the invention is neither limited to this embodimentnor to the.

photographic art but. may be embodied in other forms and usedinother -arts within the-scope of the appended claims; In the accompanying drawing Figure 1' is a perspective view .of the ap-- paratus showing? the underside of the fla'sh Fig. 2 is a front elevation ofthe com bined latch andswitch. v v

Fig. 3' is a sideview'of the same. 1 I

Fig;4 i a ottom plan view of certain 'circuitterminal's. 7 I v Fig.5 is-"a side view thereof. F'g.f-q6f is a side view of the fuse holder with-'awfuse mountedtherein.

F-iglg7'is a top plan view'of the same; I

Fig. 8. is a bottom plan view thereof,

Specification oi Letters Patent.

Other ob- I v Patented Dec. 3, 1918.

. App1icationfi1edMarch17,1917; Seria1No.155,538. 1

Fig. -;9 is a. diagram of the ignition cir 7 cuits;

Fig. 10 is a perspective view of a fuse. I

or cabinet. 1 r y The pan 1, which receives the flash powder 2, ismounted upon a substantially vertical metal door 3 hinged on the flanged metal panel 4:. The pan has a small opening; in' v the bottom thereof 'alining with holei5 in insulating late 6 bolted at? at .the bottom of pan-1. ounted on plate ,6 are two parallel strong terminal springs 8= of brass or I copper, spaced from plate 6 -by insulating The-fuse, which is an organized structure in bar9 .to which they are fastened at 10 and also spacedfrom each other soas to. leave. opening 11. They'carry binding posts 12.

*contradistinction to mere 'wire, comprises a strip 13 of insulating material wrapped at "each end with thin fcopper, brass, or similar bands 14, 14, between which a fuse wire 15' such as fine iron wire is stretched -dered. i V

The fuse is not placed directly in the apparatus but is first mounted ona holder which is then slipped into the apparatus and sol- This holder comprises a handle;16' and a plate16 of insulating material such as hard fiber on? the bottom of which is medially fastened an insulating guide piece 17 adapted to fit openin-gll. On ,both sides of the piece 17 are. fastened two copper bands 18, '18,

which are bent up-around the edge of the plate at 19, with their'ends 20 on the topof the plate. Two strong copper or ,brass springs 21, 21, under which .the fuse may be slid, are fastened. on or made integral with i ends 20. The outer-ends of springs 21, and {8 are beveled or bent to permit the The readily inserted;- under them; 1'

parts .to

The latch of the door 3 includes a rotary shaft 22 carrying at its outer' end ahandle 23 Also'fmoun'ted near. the outer end ofshaft -and at-its inner end a bar 24 adaptedto catch. over the panel 4 to help hold the. door closed.

22 is a switch arm 25 adaptedto close the electriccircuit, when the door is shut, by

-='conta'cting 1 with the complementary switch 1 members 26,27mounted together with-bind ing'post28 on insulating plate29 on panel 4:. .One side of the electric circuit is con nected to binding post 28; the other side is connected to one of the binding posts 12. The remaining post 12 is connected to the metal door 3 by wire 30 soldered thereon.

Bar 24, which may be insulated, has an additional function. WVhen door 3 is open, the operator might inadvertently turn arm '25 to its horizontal position. Under such circumstances the arm 25 could hit means were present.

preventive means. With door 3 open, if arm be turned to the horizontal position, bar

against the outer face of. member 26 and cause a premature ignition,if no preventive Bar 24 constitutes such 24 likewise becomes horizontal andwill itself hit against member 26 and positively maintain arm 25 separate from member 26.] r Fig. 9 illustrates a V convenient way of connecting up the above parts with a source of power 31, a pilot glow lamp 32, a two way switch 33 and a normally open push switch 34; When making a flash the current from source 31 passes through the following series of parts: Push switch34, postj28,' members 26, 27, arm 25, shaft 22, door 3, wire-30, apost 12, a strip 8,a band 18, an end 20, a

spring21, a band 14, fuse Wire 15, the other band 14, the other spring 21, end 20, band 18, strip 8, post 12, and switch 33 to the.

source 31. To test the circuit before the flash is set off, the lamp 32 is connected'in the circuit byturning switch 33 to the dotted position in- Fig. '9. Thislamp will glow if all the electrical connections are adequate but its resistance is so great that it lowers the test current to a small amount which When switch 33-:

does not blow the fuse.

' short-circuits the lamp 32, as shown in full device or it may be incorporated in a bag 'or I cabinet 37', (Fig. '11-) of the light-diffusing andjsmokeretaming type. Due to'the certainty fand promptness of ignition, several of these ignition-devices may be connected.

to fire' their [charges simulg together so as taneously.

' A fuse'isslippedunder springs 21 on'the lines in Fig. 9, a current through the fuse can be obtained great enough to blow it. 7

Deflectors 35, 35 may be fastened to panel 4 at each side of door 3. The panel 4 may also carry incandescent lamps V 36 to illuminate the sub ect to be photographed while being posed. The apparatus hereinabovej described may be used. as an open-tray flash The Operation bf y pparatus is as follows: r

holder with'fuse wire; 15 on theou'tside-as shown in Fig-7. The rubbing and scraping action between-springs 21 and bands '14 insuresa good broad electrical connection be;

tween th'e'miThis is an impo'rtant' point 'be cause itavoids the insulating elfect-ofthe scale which always forms in 7 time on the.- :parts near the flash. It is also-noted that.

this scale removing friction takes place-bel to go off.

tween 'metal parts that have suflicient area 7' and are hard enough to. accomplish the'desired result. In devices, where the electric connection is made directly with a small, and 7 often soft, fuse-wire by pressure or friction,

the results are not [reliable because of the small contact areaof the wire and theinabllity of the soft wire to remove the insulating scale. By soldering the fuse wire tobands 14 and letting the latter, make the rubbing contact, the connections are alwaysrehable,

comes to a The handle 23 of the door 3 is next turned to the'position indicated in dotted lines in Fig. 2,.and the door opened, thereby breaking the electrical connection between arm 25 and switch members 26, 27 so that no current can be sent through the apparatus as long as the door is open.

The assembled holderand fuse are next inthereby avoiding the loss of prestige which f photographer whose flash refuses serted under springs 8, guide 17 sliding into' 7 opening 11 and the fuse wire 15 coming oppositev hole 5; -.Duringthis insertion the suring reliableelectrical connection between pan above the fuse with which it f comes into igniting proximity through hole 5..

turned soas to lock it and restore connections between arm 25;and members 26, 27.

If desired, a test of the electrical connections can 'nowrbe made, using lamp 32 asrhereinabovedescribed. The fuse is set off by closing the push switch. 34 when the other springs v8 strongly rub againstbands 18,in-

- them; The flash powder is now placed in the 195 "The door'is next closed and, handle 23" switches are incorrect position. The currenthighly heats the'wire 15 to the point where it melts and'perhapsgives a puff of It is sometimes necessary tomakea second 1 7. 110

flash as soon aspossible after the first one. My device especially facilitates this; The operator opens the door, takes out the holder,

replaces the spent fusewitha freshone, and

the parts of theholderwill quickly' cool 7 While the fusejis preferably of'ithe' form shown, any fuse "which; includes suflicientf area in its terminals to allow; a V scale-remov 'ing'frictional contact may be usedgi Other V modifications 'iwithin 'theiisciope of the" ap-?' incandescent vapor-, igniting the flash powder aboveit'withina'very short time 7 7 after the pushswitchjis closed.

pended claims Will occur to persons skilled in this art. I I

I claim: 1

1. In an ignition device, an ignition element having electrical terminals of relatively wide area, a holder, means on the holder for detachably supporting said ignition element and frictionally engaging said terminals and a support for the combustible having means thereon for detachably retaining the holder and ignition element in igniting proximity to the combustible, said holder being provided with a handle extending away from the combustible when the holder is in position on said support.

2. In an ignition device, an ignition element having electrical terminals thereon, a holder having means for detachably and replaceably supporting said ignition element and for making electrical connection with said terminals, and a receptacle for the combustible having members for detachably retaining the holder and ignition element in operative proximity to said combustible, said members making electrical connection with said means, said holder having a handle shielded by the receptacle from said combustible.

3. In an ignition device, an ignition element having electrical terminals thereon, a

holder having metal strips shaped to de-.

tachably and replaceably support the ignition element and electrically connected with said terminals, and a receptacle for the combustible having metal strips for detachably supporting the holder and for making electrical connection with the strips on said holder.

4. In an ignition device, an ignition element including electrical terminals, a holder having metal strips with resilient portions to detachably support the ignition element and frictionally connect with said terminals, and a receptacle for the powder having resilient metal strips thereon for detachably supporting the holder.

5. In an ignition device, an ignition element having electrical terminals, a holder therefor comprising a base carrying two metal strips to detachably support the ignition element and frictionally connect with said terminals and also carrying a guide, and

wvith an ignition element having electrical terminals, and a holder comprising a base having an insulated handle and provided on its upper face with two spaced insulated metal springs for holding said ignition element and contacting with its terminals, said comprising a base provided on its upper face with two spaced metal gripping sprlngs and on its'under face with two metal ter- 7 minals electrically connected to said springs, and a receptacle for the combustible provided with two metal springs for detachably supporting the fuse holder and frictionally making electric contact with said terminals.

8. In an ignition device, a fuse holder comprising a base provided with an insulated handle and having on its upper face two spaced metal gripping springs and on its under face a central guide and at each side of said guide two terminals electrically connected to said springs, and a receptacle for the combustible provided with two spaced metal springs under which the fuse holder is adapted to be slipped and detachably held, said springs on the receptacle making electrical contact with said terminals and receiving the guide between them.

9. In an ignition apparatus, a holder for detachably supporting a fuse, comprising a base having an insulated handle and on one face two metal gripping springs and on its other face two terminals electrically connected with said springs.

10. In an ignition apparatus, a holder for detachably supporting a fuse, comprising a flat base of insulating material having an insulated handle and provided on one face with two metal gripping springs and on its other face with an insulated block and two metal terminals electrically connected to said springs.

11. In an ignition apparatus, a panel and a door hinged thereon provided with a support for a combustible and a detachable electric ignition element adjacent the combustible, said door provided with a combined latch and switch, the switch being in circuit with the ignition element so as to open said circuit when the door is unlatched.

12. In an ignition apparatus, a panel and a 'door hinged thereon provided with a support for a combustible and a detachable electric ignition element adjacent the combustible, said doorcarrying a pivoted switch arm, there being a cooperating switch element on the panel with which the switch arm interlocks to complete the circuit and hold the door in closed position.

13. In a flash abparatugapanel, a door in said panel provided with a combined latch 7 flopies of tliis patentmay' be obtained for and switch, said switch being open when the door is unlatched, said door carrying an ignition device, and means for preventing premature closure of: said switch while said door is in open. position.

14. Ina flash apparatus, a panel, a door in'said panel, a switch memberjon said panel, a movablecooperating switch member on the door, sa1d switch members cooperating to latch the door, and a safety elementmoV- ablewith the switch niemberon the door to 7V maintain said membersseparate when the.

Inite'stimony whereof I have signed this specification, ,.f1n the presence of two w1tdoor is unlatched.

nesses, this 8th day of March, 1917, at Rochester, N.,-Y;; I

\Vitnesses: y v w 1 FRE H. GARDNER, 5v 7C; EKMA TIN. I

five cents each, by addressing the Commissioner of Patents, Washington, D. 0, a

JOHN i CBABTREEL j

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