US2368685A

US2368685A - Multiple filament lamp

Info

Publication number: US2368685A
Application number: US516457A
Authority: US
Inventors: Grover C Singer
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-12-31
Filing date: 1943-12-31
Publication date: 1945-02-06
Anticipated expiration: 1962-02-06

Description

Feb. 6, 1945.

G. c. SINGER MULT'IPLE FILAMENT LAMP Filed Dec. 51, 1945 FIGJ. F1612 36 52 as 37 y GROYER a. swan.

Patented Feb. 6, i945 UNlTED STATES PATENT OFFICE 6 Claims.

This invention relates to an electric lamp and a method of constructing the same.

An object of the invention is the provision of an electric lamp-and the method of making the same, in which the lamp has a solid base member formed integrally with the globe, with both being formed of transparent materials, with the inner surface of the base member, and likewise the bottom of the globe being provided with a reflector, the base member having a longitudinal passage through which are adapted to be inserted filaments and specially constructed supports for the filaments, said supports being secured in place by lead-in wires projecting above the inner surface of the base member.

Another object of the invention is the provision of an electric lamp having a base member formed of the same transparent materials as the globe, with a passage through the base member for the insertionof specially constructed supports and filaments, the inner surface of the base member, which also forms the bottom of the globe, being covered with reflecting materials, said inner surface being concave, convex, or fiat.

A further object of the invention is the provision of an electric lamp in which the base and bulb are formed integrally of the same transparent materials, said base member having embedded therein wires to which are connected supports for filaments arranged in the arcs of a circle, said supports being in the form of a sleeve adapted to be received by the inner ends of the lead-in wires, with the ends of the lead-in wires bent to secure the sleeves in place, the inner ends of the sleeves being provided with a lateral split projection to receive an end of a filament, said supports and filaments being insertable through a longitudinal passage in the base member, and fixed in place by suitable tools which are insertaible through the passage for properly positioning the supports.

, changes and' modifications as define no material departure from the salient features of the invention as expressed in the appended claims.

Figure 1 is a horizontal section of an electric lamp constructed according to the principles of my invention.

Figure 2 is a vertical section taken along the line 2-2 of Figure 1.

Figure 3 is an enlarged fragmentary vertical section showing the method of securing a support in place on a lead-in wire.

Figure 4 is a section similar to that shown in 5 Figure 1, but showing a modified form of refleeting urface.

Figure 5 is a vertical section of another modified form of the lamp disclosing anotheriorm of reflecting surface.

Figure 6 is an enlarged plan view of one section of the filaments and their supports.

Referring more particularly to thedrawing, It designates a base member formed of transparent material such as glass, and this base member forms the bottom, which has the usual threaded sleeve ll attached to a reduced portion i2 so that, the lamp can be screwed into the usual lamp socket. It will be noted that the base-member is integrally formed with the bulb l3 so that it is necessary to insert the filaments and their supports through a central longitudinal passage l4, extending entirely through the base member and opening at IE to the inner end of a convex portion it of the base member.

Lead-in

wires

20, 2|, 22 and 23 are embedded in the material of the base member [0, and project upwardly as shown at 24 in Fig. 3, with the inner free ends of said wires split to form securing

elements

25 and 26. In other words, a sleeve 21 is inserted on the inner projecting end 24 of a 'wire and split

ends

25 and 26 are placed downwardly over the upper end of the sleeve. If desired. these ends may be twisted to form an enlargement -for retainingthe sleeve 21 in place.

".Sleeve 21 (Figs. 1 and 2) has a lateral extension 28 at its upper end and this extension, as is the sleeve 21, is formed of metal, and is split to receive one end 29 of a filament 30. The other end of the filament is received by a split end 3| of a lateral extension at the upper end of a sleeve 32. A second lateral extension -33 is located diametrically opposite the extension 3| and is split to receive one end of a filament 34.

A third sleeve 35 is received by a wire 22 and has a split extension 36 at its upper end to receive the other end of the filament 34. The posts or

sleeves

21, 32 and 35 are so arranged around the inner surface 31 of the member in that-the

filaments

30 and 34 are located in an arc of a circle at one side of the central passage H in the base member Ill.

A group .of filaments 40 and 4| are supported by hollow posts 42, 43 :and 44 at the other side of the passage I4, with the filaments being arranged in the arc of a circle.

member have been completed, the hollow posts and their connected filaments are inserted through the passage ll of the base member and the posts are inserted over the inner ends of the lead-in wires by a' suitable tool and the split ends of the lead-in wires are then twisted or bent down over the posts. After the silvering materials which form a reflector 45 have been applied to .ments.

the inner surface of the globe l3, and the base member ID, the lamp is ready for exhaustion of the air through the passage M. then closed by the usual cement to form a sealing plug 46.

Each of the

wires

20, 2|, 23 and 23"- is provided with a contact 41 at the outer end of the base member ID for engagement with a contact in the usual socket of 'the lamp.

Wires

22 and 22* extend to the thr ded metal collar or sleeve II. Thus, it will beseen that the current passes through the

wires

20 and 2|, also

wires

23 and 23 to the filaments, while

wires

22 and 22 complete the circuits to the fila- The lamp shown in Fig. 4 is identical in construction with that shown in Figs. 1 and 2, ex-

cept that the inner surface .50 of the base member III is fiat instead of convex as shown in Figs. land 2. 1

The lamp shown in Fig. 5 is substantially identical in construction as that shown in Figs. 1, 2 and 4, except that the inner surface 5i of the base member I is convex. The globe l3 is slightly different in shape, although the same shape of globe may be, employed as illustrated in Figs. 2 and 4.

The method of applying the silvering materials to form the refiector A is described in my co-lpending application, St'N. 461,978, filed October 14, 1942, for Incandescent electric lamps and method of making the same.

Before the silvering materials are applied to the inner surface of the globe and the base member, melted wax, a solution of beeswax or molasses is applied to the bottoms of the various This passage is etching materials contains the following ingredi-' ents by volume:

Ammonium fluoride parts- Hot water o 18 Molasses do 20 Hydrofiuoric acid "percent-.. 60

Where the filaments and their supports have been positioned before the etching materials are applied to the surface 55 and the surface 31;

said supports and filaments are thoroughly coated with the wax to protect them against the etching materials.

' Iclaim:

1. An electric lamp, comprising a base, a bulb formed integrally with said base, lead-in wires embedded in the base and having split ends extending into the bulb, a vertical sleeve mounted on each split end, the split ends of the wires being arranged to secure the sleeves in position, said sleeves arranged along an arc of a circle, each sleeve at the ends of the are having a split lateral projection, the intermediate sleeve having a pair of diametrically disposed split lateral projections, and a filamentlocated between each end sleeve and the intermediate sleeves, the ends of the filaments being clamped'betw'een the adjacent split projections of the sleeves.

- 2. An electric lamp, comprising a base, a bulb formed integrally with said base, lead-in wires embedded in the base and having split ends extending into the bulb, the inner surface of the base and a portion of the sidewalls ofthe bulb having a reflecting surface thereon, that portion of the inner surface of the base surrounding the extended ends of the lead-in wires being free hollow posts, and also to the inner surface of the base member l0, surrounding the bottom'of the posts, so that when the silvering material is applied, such material may be. removed, together with the beeswax or molasses, in order to leave a space 52 free of silvering material to preventshort circuiting of the current between the posts. The beeswax or the molasses'is applied as defined by an instrument suitable for the purpose.

7 between the adjacent splitv projections of the of the reflecting surface, a vertical sleeve mount-- ed on each split end, the split ends of the wires being arranged ,to secure the sleeves in position, said sleeves arranged along, an arc of a circle, each sleeve at the ends of the arc having a split lateral projection, the intermediate sleeve having a pair of diametrically disposed split lateral projections, and a filament located between each end sleeve and the intermediate sleeve, the ends of the filaments being clamped .sleeves.

Furthermore, molten beeswax, a solution of beeswax or molasses is placed in the outer end of the bulb l3, and the bulb is then revolved to cover the inner surface 5! of the globe It to the circular line indicated by the numeral 56.

Etching materials of a well known type are then/placed within the bulb and the same is revolved to cover the inner surface located between the inner surface 31 of the base member In and the circular line 58. The etching materialsare then; removed and. the inner surface i washed, after which the protectivematerials,

including the

portions

55 and 52, are removed. The composition which is a solution of the 3. An electric lamp, comprising a base, a bulb formed integrally with said base, lead-in wires embedded in the base and having split ends ex- -tending into the bulb, two of the wires being v ';he filaments being secured in place by the fila- I ment gripping means on the sleeves.

4. An ele'ctric lamp, comprising a base, a bulb extending outwardly from said base, a group of three wires embedded in the base at each side of a plane passing through the longitudinal axis of the lamp and having ends projecting into the bulb, said ends being arranged in a, circle, a vertical sleeve on each projec'ting end, the free ends of the wires having means thereon for retaining the sleeves in position, the upper ends of the sleeves having lateral projections, and a filament located between each pair of sleeves at one side of the longitudinal plane and having the ends secured to adjacent lateral projections on the sleeves, the filaments being bent to conform to the curvature of the circle."

5. An electric lamp, comprising a base, a bulb extending outwardly from said base, a group of three wires embedded in the base at each side of a plane passing through the longitudinal axis of the lamp and having ends projecting into the bulb, said ends being arranged in a circle, two adjacent wires of each group adapted to be placed in circuit with one side of a source of current, the other wires of each group adapted to be placed in circuit with the other side of said source, a vertical sleeve on each Projecting end, the free ends of the wires having means thereon for retaining the sleeves in position. the upper extending outwardly from said base, a group of three wires embedded in the base at each side projections on the sleeves, the filaments being bent to conform to the curvature of the circle. 6. An electric lamp, comprising a base, a bulb of a plane passing through the longitudinal axis of the lamp, and having ends projecting into the bulb, said ends being arranged in a circle, the inner surface of the base and a portion of the inner walls of the bulb being provided with a reflecting surface, those portions of the surface of the base surrounding the inner projecting ends of the wires being free of the reflecting surface, saidbase having a convex surface with the projecting ends of said wires arranged around the periphery of the convex surface, a vertical sleeve on each projecting end, the free ends of the wires having means thereon for retaining the sleeves in position, the upper end of the sleeves having lateral projections, and a filament located between each pair of sleeves at one side of the longitudinal plane, and having the ends secured to adjacent lateral projections on the sleeves, the filaments being bent to conform to the curvature of the circle.

GROVE-R C. SINGER.