US1154615A - Safety-lamp. - Google Patents

Description

H'. CSANYI. SAFE-TY LAMP.

APPLICATION F ILED DEC.9. 1914.

Patented Sept. 28, 1915.

35 Wm M ans earn re.

HENRY CSANYI, OF NEW YORK, N. Y., ASSIGNOR TO MAXIVOLT PRIMARY BATTERY 00., OF NEW YORK, N. Y., A. CORPORATION OF NEW JERSEY.

SAFETY-LAMP.

Specification of Letters Patent.

Patented Sept. 28, 1915.

Application filed December 9, 1914. Serial No. 876,287.

To all whom it may concern:

Be it known that I, HENRY CSANYI, a

useful Improvements in Safety-Lamps, of

which the following is a specification.

This invention relates to electric lamps andparticularly to such lamps as embody an incandescent lamp bulb having an incandescent light emitting member therein.

Although the invention is applicable for many purposes, it is described in the following specification, by way of example, as appliedto a lamp intended to be used, for example by a miner, where there Would be danger from explosion of fire-damp if the lamp were broken and the light emitting member or filament were permitted to remain heated. I

A principal object of the invention is to providesuch a lamp with automatic means for opening the circuit through the incandescent bulb in case of an accident that might cause the breaking of the lamp in such a way as to expose the incandescent filament.

A further object of the invention is to provide simple means foraccomplishing this effect without in any way detracting from the illuminating eflect of the lamp, and without employing any parts which cast a shadow from the lamp. I Y

A further object of the invention is to construct the lamp in such a way that the incandescent bulb can be very readily placed in position. i

In lamps for this general purpose heretofore, springs have been employed for disconnecting the lamp from its socket to open the circuit through the filament, and arranged so that the spring is normally prevented from acting by means engaging with the bulb. In the lamps to which I refer the ment for holding the neck of the globe in position in a flexible manner and without the neck of the bulb being guided in a socket, and this greatly facilitates the removal or replacement of the incandescent bulb. j 6

Further objects of the invention will appear more clearly hereinafter.

The invention consists in the features and combinations of features hereinafter described, all of which contribute to produce an efiicient safety lamp.

-A preferred embodiment of. my invention will be particularly described inthe following specification, while the broad scope of my invention will be pointed out in the appended claims.

In the drawings: Figure 1 is a vertical section through a lamp having the pre-' ferred embodiment of my invention. Fig. 2 is a front elevation of the lamp shown in Fig. 1. Fig. 3 is a vertical section through a lamp embodying my invention and showing a modified form or embodiment thereof.

Referring more particularly to the parts, I prefer to provide a case 5 which may be of sheet metal and of a common dished formso thatthe inner surface 6 of the back of the lamp forms a reflector for the rays coming from the incandescent bulb 7. I prefer to provide this case 5 at a suitable point with an integral sleeve 8 which is preferably disposed on the interior. at one side of the case; and in, this sleeve I prefer to provide an insulating bushing 9. In the bushing 9 I prefer to provide a yielding contact 10 which is preferably in the form of a pin passing slidably through the bushing, the upper end of the said pin having a head 11 which is adapted to touchv the neck contact 12 preferably formed in the end of the neck 13v of the bulb 7.

The yielding effect in the contact 10 is preferably produced by means of a helical spring 14 which is disposed in a bore in the bushing, the upper end of the said spring thrusting against a shoulder 15 formed under the head of the pin, the lower end of said pin preferably having'a collar 16 which --ei1'gages the lower end of the bushing 9 to 'nected in any suitable manner such as by necessarily guided in the case in any way but may bea floating collar, that is, it is freely movable laterally, except that it is retained in position by means of a spring, preferably a coil spring 18, the lower end of which seats on the sleeve 8, the upper end of the spring engaging around the reduced body 15) of the collar and thereby holding the collar in place. I prefer to form the lamp circuit through this spring, for which reason I prefer to ,attach the lower end of the spring to the side of the sleeve 8 by means of a suitable fastening orscrew 20, and to this end also, one 'of the leading-in wires 21 of the bulb is preferably connected to the neck 13; the other leading-in wire 22 preferably leads down to and connects with the above mentioned neck contact 12 of the lamp.

Evidently the springs 14 and 18 tend to force the collar 17 inwardly toward the central part of the case and tend to break the lamp circuit throughthe contact pin 10. In order tonormally prevent this, I prefer to provide a rigid that is, unyieldingmember 23 which maybe of any form desired and placed between the bulb and a wall of the lamp on the side opposite the spring 18. I do not limit myself to the particular position indicated for the sleeve 8 on the case.

The member} 23 is preferably of translucent frangible material and is hence conveniently in the form of a glass tube one end of which may engage over the nib 24: of the bulb which is opposite the neck 13, and the other end of this member is arrangedin any way such as will enable it to resist the thrust of the spring; that is, it resists the thrust of the spring by a reaction exerted "from the wall of the lamp opposite the spring. It is obvious that when the lamp receives a blow the shock of such a blow will be imparted to the bulb through the part 23; in other words the shock is concentrated at one point on the bulb. So the bulb or the part 23 can.

be easily broken and they tend to break at a point opposite the springs. If the bulb is broken by a shock as suggested or if the member 23 is-broken by such a shock evidently the bulb will become displaced and the circuit will become open at the contacts. When using a part 23 of the form shown in Fig. 1, I prefer to provide a retainingdewas 25 which may be of any desired form and may, if desired, include anadjusting screw 26 with the inner end of which the tubular member23 engages. This adjust mg screw 26 is preferably threaded in the wall of the case and may be provided with a check nut 27 for holding itfixed in any adjusted position desired. 1 It is evident that although this part 23 is in the path of the reflected rays coming from the filament 28 it does not cast any shadow on account of its translucent quality.

Conductors or wires indicated diagrammatica-lly by'the lines 29 and 30 afford means for effecting a circuit through the filament, one of said conductors being connected with the insulated contact pin 10, while the other is connected to the wall of the case 5 so as to be brought into electric contact with the spring 18 which is a conductor of the current and which is grounded on the case at the fastening 20. The lens 31 constitutes the forward wall of the lamp and is held in place in any suitable manner, for instanceby a light piece of bent wire 32.

The operation of positioning the bulb 7 within the case is very simple and consists substantially in screwing the collar 17 onto the neck 13 and then seating the collar on the upper end of the spring 18.. The spring 18 is compressible by a force exerted on the wardly and will exert a longitudinal thrust in the member 23to hold the member 23 between the bulb and the wall of the lamp.

The screw 26 preferably has a reduced tip (see Fig. 1) to enter the end of the tubular member 23 and this tip centers the bulb 0n.-

the screw in setting the bulb in position. The member 23 prevents a sufficient move ment of the collar by the springs to break the circuit at the contact 12. In other words,

the pin 10 follows up the neck contact 12 in the outward movement and maintains the circuit closed after the member 23 has been positioned.

()bvious'lymany changes may be made in the application of myinvention. In practice, the member 23 need not have the form illustrated, nor need it be secured in the manner shown. One of the many modified forms the invention may take is illustrated in Fig. 3, in which the .bulb 33 is provided with an integral stem 34 for opposing the spring 35. This stem 341 is preferably a part of the tube from which the bulb 33 is blown, and the stem is afterward sealed ofi from the interior of the tube'by pressing in the wall of the tube to form av solid neck 36. In other respects the lamp illustrated in Fig. 3 is the same as illustrated in Fig.1.

vention, if the lens 31 becomes broken, as by accident, and the members 23 or 34, or the ,incandescent'bulb displaced or broken,

Obviously .with a lamp embodying my, in-

the spring such as the spring 18 will immediately force the bulb away from the contact point at which the circuit is made through the lamp, and this will immediately extinguish the filament 28 and there will be no danger of causing an explosion if the lamp is in an atmosphere charged with an explosive gas.

It is understood that the embodiment of the invention described herein is only one of the many embodiments the invention may take, and I do not wish to be limited in the practice of the invention, nor in my claims, to the particular embodiment set forth;

What I claim is v 1. In an electric lamp, in combination, a case including a lens, an incandescent lamp .bulb'within said case, a contact mounted in said case to'close the circuit through saidbulb, a spring tending to move said bulb to open the .circuit'at said contact, and a translucent member in the path of the rays from said bulb between a wall of the lamp and said bulb, and normally preventing saidspring from opening the circuit at said con tact.

2. In an electric lamp, in combination, a case including a lens, an incandescent lamp bulb within said case, a contact mounted in said case to close the circuit through said bulb, a spring tending to move saidbulb to open the circuit at said contact, conducting the current of the lamp circuit, and a rigid member between a wall of the lamp and said bulb and normally preventing said spring from opening the circuit at said contact.

3. In an electric lamp, in combination, a case including a lens, an incandescent lamp bulb within said case, a contact mounted in said case to close the circuit through said bulb, a spring tending to move said bulb to open the circuit at said contact, conducting the current of the lamp circuit, and a translucent member'in the path of the rays from said bulb between a wall of thelamp and said bulb and normally preventing said spring from opening the circuit at said contact.

4. In an electric lamp, in combination, a case including a lens, a lamp bulb in said case having a neck with a contact in the lamp circuit, a freely movable collar on said neck, a spring conducting the current of the lamp circuit, retaining said collar and tending to move the same to open the lamp circuit at said contact, and a rigid relatively weak and fragile part between said bulb and a wall of said case resisting said spring and maintaining the circuit through the lamp.

5. In an electric lamp, in combination, a case, an incandescent lamp bulb, a neck with a contact inthe lamp circuit, a collar on said neck, a rigid unyielding part retained between a wall of said lamp and said bulb ing part retained, between a wall of said lamp and said bulb, a spring retaining said collar and compressible by said collar to permit the positioning of said rigid part, and

a yielding contact in the lamp circuit having a spring compressible by said neck contact when said rigid part is being positioned, and maintaining the circuit closed after said rigzid part is positioned.

.In an electric lamp, in combination, a case, an incandescent lamp bulb having a neck with a contact in the lamp circuit, a collar on said neck, a rigid unyielding frangible part retained between a wall of said lamp and said bulb opposite said neck, a spring conducting the current of the lamp circuit retaining said collar and compressible by said collar to permit the'positioning of said rigid part, and a yieldingcontact in the lamp circuit having a spring compressible by said neck contact when said rigid part is being positioned and maintaining the circuit closed after said rigid part is positioned.

8. In an electric lamp, in combination, a case, an incandescent lamp bulb within said case having a neck, a' freely movable colla receiving said neck, an insulated contact carried by said case, said neck having an insulated contact adapted to engage with said first named insulated contact, a spring mounted in said case and tending to move said collar to break the lamp circuit at said contacts, and a frangible bar between said bulb and a wall of said lamp opposite said spring receiving the thrust of said spring longitudinally and preventing said spring from opening the circuit.

having an insulated contact adapted to engage with said first named insulated contact, a coil spring mounted in said case and engaging at one end around the body of said collar to retain the same, and tending to move said collar to break the lamp circuit at said contacts, and a frangible bar between said bulb and a wall of said lamp opposite said spring receiving the thrust of said spring longitudinally, and preventing said spring from opening the circuit.

10. In an electric lamp, in combination, a

case, an incandescent lamp bulb thereirr having a contact, an unyielding partextending from the said bulb to a wall of said case, a contact on the case engaging said firstnamed contact and a springfpressing said bulb so as to hold said unyielding part,

against the said wall of the case.

11. In an electric lamp, in combination, a case including a lens, an incandescent lamp bulb therein having a contact, a relatively weak and easily broken part constructed to break from a blow or jar which is insufficient to break said lens, disposed opposite said contact and extending from sa1d bulb to a wall of said case, a contact in said case engaging said first contact to close the circuit through said bulb, and resilient means tending to move said bulb in a direction to press said partaga'inst said wall.

12. In an electric-lamp, in combination, a case including a lens, an incandescent lamp therein having a contact and an easily broken part constructed to break from a blow or jar insufficient to break said lens, said part disposed opposite said contact, a contact in said case engaging said first contact to close the circuit through said bulb, and resilient means resisted by said easily broken part for separating the said contacts and thereby open the circuit when said easily broken part breaks. I

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HENRY CSANYI.

I Witnesses:

S. ANDREWS, L. ELFMAN.

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