US1279789A - Incandescent lamp. - Google Patents

Description

F. G. TILLEY.

v INCANDESCENT LAMP. APPLICATION FILED JAN. 31. 1911.

1,279,789. Patented Sept. 24,1918,

WITN asses [j wwmbmk.

ATTORNEY UNITED STATES PATENT OFFICE.

FREDERICK v'JI'IIILLEY, OF ST. LOUIS, MISSOURI, ASSIGNOR F ONE-FOURTH TO CHAS. E. ROTT,,0F SAPPINQTON, MISSOURI.

INCANDESCENT LAMP.

Specification of Letters Patent- Patented. Sept. 24, 1918.

' Application filed January 31, 1917. Serial No. 145,716.

To all whom it may concern:

Be it known that I, FREDERICK G; TILLEY, a citizenv of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Incandescent Lamps, of which the follow- 7 ing is a specification.

This invention relates to incandescent lamps. I

One of the main ob ects of the mventlon is to provide a lamp having an incandescing or glow member or filament of coiled shape so as to provide a large light radiating surthe danger of breakage due to vibration and sudden jars to a minimum. A still further object is to provide a permanently magnetized element of coiled shape the turns of which are arranged alternately with, and mid-way between, the convolutions of the filament so as to oppose movement of the filament. turns in either direction axially of the filament coil. Further objects will appear from the detail description.

The single figure of the drawings is a central section taken through the lamp constructed in accordance with my invention.

The lamp is rovided with the customary glass bulb or g obe 1 from which the air is removed by a mercury pump or the like to form a vacuum, or the globe may be filled with nitrogen, argon, or other similar gas which is inert with respect to the filament. v

This globe is provided with a radially extending standard2 the. inner portion of which is reduced to form an integral inwardly extending supporting post 3 the inner end of which is enlarged to form an integral disk 4. A lead 5 is mounted through the standard 2 and connected, to one terminal 6 of a socket 7, which is secured about the base of standard 2. A lead 8 is mounted through standard 2 in spaced relation to lead 5 and is connected to the usual metallic covering 9 of socket 7, this socket being adapted to be threaded into a wall socket 10 of standard construction in the usual manner.

The lead 5 is extended upward through .post 3 at the center thereof The upper end of this lead is electrically connected to the upper end of a coiled glow member or filament 11, as at 11*. This filament is coiled about the post 3 concentric therewith and its lower end is electrically connected to'the inner end of lead 8 as at 11". By this means a relatively long filament having a comparatively large light radiating surface may be mounted within the bulb 1 and has its ends connected to the leads 5 and 8 in the usual manner. This filament is made from tungsten or other suitable infusible material. A magnetized coiled member 12 is mounted about the post 3 with its upper end secured to disk 4 as at 12 and its lower end secured to the standard 2 as at 12*. The coil of this member is of the same diameter as the coil-of filament 11, and the convolutions of member 12 are disposed alternately with, and midway between, the convolutions of filament 11. This member 12 may be formed from highly tempered steel and is magnetized, to provide a glass-hard permanent magnet. The magnetic stresses between the convolutions of the member 12 serve to maintain the convolutions of the filamept midway betweenthe turns of the member 12, movement of the convolutions of the filament in either direction axially of the filament coil being opposed by the magnetic-traction of the convolutions of the magnetized member. If desired, the magnetic member 12 may be made of magnetite so as to provide a permanent magnet instead of forming this member from highly tempered steel which is magnetized. A

By providing a coiled filament in combination with a magnetized coiled member the convolutions of which are disposed alterused, or is in operation. When the current is turned on it flows through the filament so as to cause incandescence thereof. This current will, necessarily, flow through the magnetic fields between the coils of member 12 and the magnetic stresses Will urge the coils of the filament in opposite directions thus maintaining the convolutions of the same in central position between the convolutions of the magnetic coil. In this manner, when the light is in use, the filament will be held in proper operative position and sustained by the magnetic stresses of the member 12 so as to eliminate breakage or fracturing of the filament through sudden jolts or jars. As the magnetic coil is formed from very highly tempered steel as to provide a glass-hard permanent magnet, it Will not be readily demagnetized by the heat of thfe filament, but Will have a relatively long li e.

In addition to serving by magnetic attraction to oppose movement of the convolutions of the filament coil in either direction axially of the same, the member 12 also acts as a guard to prevent excessive movement of any of the convolutions of the filament, the coils of this member 12 being so positioned as to engage the convolutions of the filament thus positively limiting movement of the same in the event of the lamp being subjected to any unusual jar such as would tend to cause excessive movement of the filament coils. By this means the magnetized member 12 acts to oppose movement of the filament under ordinary conditions, and to positively prevent excessive movement of the filament in between the convolutions of said coiled member.

2. In electric lamps a coiled magnetized member, and a similarly coiled filament, the convolutions of the filament being disposed midway between the convolutions of the said magnetized member.

3. In electric lamps, a coiled filament of magnetic material, anda coiled magnetized member having its convolutions disposed al ternately with and midway between the convolutions of said filament.

4c. In electric lamps, a coiled filament of magnetic material, and a permanently magnetized coiled member disposed with its convolutions midway between the convolutions of the said filament.

In testimony whereof I aifiX my signature in presence of two Witnesses.

FREDERICK G. TILLEY.

Witnesses:

GHAs. F. Ro'rr, DELLA P. Proms.

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