US1997975A

US1997975A - Incandescent electric lamp

Info

Publication number: US1997975A
Authority: US
Priority date: 1933-05-12
Publication date: 1935-04-16
Anticipated expiration: 1952-04-16
Also published as: DE622233C; GB402664A; FR736998A; BE395662A

Description

April 16, 1935. M. c. PERRIN ET AL INCANDESCENT ELECTRIC LAMP Filed April 21, 1933 2 Sheets-Sheet l nS/V F Y if em K W m U m QM April 1935- M. c. PERRIN ET Al.

INCANDESCENT ELECTRIC LAMP Filed April 21, 1933 2 Sheets-Sheet 2 Patented Apr. 16, 1935 1,997,975-

UNITED STATES PATENT. OFFICE INCANDESCENT ELECTRIC LAMP Marcel Charles Perrin and Jean Eugene Vinzant,

. Paris, France Application April 21, 1933, Serial 'No. 667,182 In France May 12, 1932 7 Claims. (Cl. 176-29) The object of the present invention is to pro its concave side, suspensions members, such as vide an incandescent electric lamp capableof hooks, eyelets, etc. 15 which are secured in many applications. The invention also aims at the body of the insulating support and serve to producing a lamp of great simplicity and very carry the filament; in addition these insulating substantial and of little cost, as a result of a support elements 5 comprise fixing means such 5 simplification in the working of the glass. More as clasps I! or slits ill, by which the said elements particularly its object is to do away with fragile are mounted on the support wire I5. supports, such as small rods of glass, which are In any case, the support members and the susfrequently used in such lamps. pension members which they carry are mounted A further object of the invention is to provide within the glass tube 1 in the following manner; 10 I tubular lamps such as in the form of letters, for (a) The plates of mica 5 5 are cut into luminous signs characterized by great simplicity triangular form. of construction and allowing of the use of tubes (b) The suspension members or clasps l6 are of great length of small diameter and of the most fixed on the cut p s 52 varied forms. l (c) All the plates 5 5 are then mounted 15 Electric lamps in which the foregoing objects on the support wire l5. t v

are attained have the characteristic features ((1) The filament 4 is inserted into the suspenspecified in the following description and in the sion members I6 carried by the plates 5 5 claims appended to the end of this description. (e) With the aid of the supp W t Fig. l is an'elevation of a tubular lamp having chain thus formed is passed into the interior of the form of a letter. 7 the glass tube I in such a manner that the plates Fig. 2 is a longitudinal sectional view of the take up a position parallel to the axis of the tube. tube in the course of mounting. This glass tube l is provided further with a fiared Fig. 3 is a transverse section of a'tubular lamp or bell-shaped mouth I which allows of t e ready taken on the line 3-3 in Fig. 2. insertion of the support elements 5 5 5 5 Fig. 4. is an elevation of a tubular lamp hav- (,f) The electrical connections to the two exing the form of an arc of a circle. tremities of the filament are secured, one end Fig. 5 is an elevation of a cut plate support being joined up directly to the electrode 3 while forming a constituent elementof the'lamp shown the Other extremity is joined D to h -I D in Fig. 4. 7 wire l5, which acts as the return current 0011- 30 Fig. 6 is a perspective view on a larger scale ductor and is connected to the second electrode 3 showing the assembling of the supporting ele-v (g) A Vacuum is produced Within the tube mentsof Fig. 5. which is then sealed at both its extremities.

Fig. '1 represents a detail of one of the sup- Th supp rt nts 5 52 ar p a l ports shown in Fig. 6, of a heightgreater than the inner diameter of 35 The tubular lamp illustrated in Fig. 2 consists h l ss tube so h these pp members essentially of a glass envelope in the form of a can be'giveh a curvature t0 a ow o their cylindrical glass tube in which the filament being easily introduced into the glass tube and 4 is carried by several insulating support memmaintained there Subsequently p y y their 40 bers 5 5 5 mounted in the inte i r of the elasticity, while at the same time they are sup- 40 glass tube l and themselves maintained in their ported 011 the inner Surface. of the glass tube. correct. positions by a. support wire :5, The suspension member It of the filament 4 is One extremity of thefila ent 4 i connected bent into a curved form for part of its length to one of the electrodes 3 conveying current and co-opelates in retaining the Supporting thereto, while the other end of the filament 4 is n in ts Curved position. 45 connected to the support wire l5 which serves In the foregoing a p it as bee underas areturn current conductor and is connected StOOd that the Supporting e t 5 5 to a seco d l ctrod 34 were independent of each other and were ar- Each insulating support element 5 is preferably a d pa o the a iS 0 the glass tube I.

in the form of a triangle or of some modjfica- In the particular construction shown in Fig. 5, 50 tion of a triangle so that this support bears at se various Support elements 5 5 are asthree points on the inner surface of the glass sembled in suchamanner relatively to each other tube l and thus ensures the precise centering as to form a continuous chain extending over of the filament 4 relatively to the glass tube I. the whole length of the glass tube.

Each insulating support element 5 carries on Further, the part of these support members 5 I which carries the filament 4 is arranged at right angles to the axis of the glass tube.

The chain support consisting entirely of insulating material such as, for instance, mica, possesses a high degree of suppleness and is particularly suitable for use in connection with the equipment of bent tubes of every shape. This chain is made up of plates 30 (Fig. 6), the central tongue or blade 3| of which, once it is raised, serves as a support for the filament 6.

These plates are attached to each other by means of clips 32 (Fig. 7), which at the same time, maintain the tongue 3! in the verticalposition at right angles to the axis of the tube.

The flexible chain in question may be maintained in position by the mica blades 34 forming a spring and bearing on the inner wall of the tube I. In Figs. 6 and 7 will be seen. aspring blade 34 secured on the tongue 3!.

As a result of the above methods of construction there can be provided electric lamps of very simple construction and of low production costs and at the same time not at all fragile, as a result of doing away with the usual glass supporting rods.

Furthermore, the avoidance of the usual metallic supports sealed at one endin the small glass rod gets rid of a source of vibration which prevents the satisfactory preservation of the filament. These advantages, which are valuable enough for ordinary lamps, possess a special interest in the case of straight or bent tubular lamps, because the arrangements adopted up till now necessitate a limitation of the length of the tubes owing to the fragility of the supports; furthermore, the strengthening of the latter and their mounting compels the makers to employ tubes in which the diameter, which must increase with the length, renders the lamp cumbersome.

With the arrangement provided by the invention, it becomes possible to construct tubular lamps of small diameter and of any length, whatever their form may be; the tubes in question may, further, be worked, foldedor bent even after the supports and the filament have been mounted. They lend themselves particularly to the reproduction of decorative devices and of luminous signs.

What we claim as our invention and desire to secure by Letters Patent is:

1. In an electric lamp comprising a glass tube and electrodes, the combination of a plurality of independent flexible supports of insulation mounted in the glass tube, a filament carried by said independent supports and connected to the electrodes, and connecting means independent of the filament for connecting the independent supports to form an adjustable flexible connection.

2. In an electric lamp comprising a glass tube and electrodes, the combination of a plurality of independent flexible supports of insulation mounted in the glass tube, a filament carried by said independent supports and connected to the electrodes, and a supporting wire independent of the filament and mounted in the glass tube for flexibly connecting the said independent supports.

3. In an electric lamp comprising a glass tube and electrodes, the combination of a plurality of independent flexible supports of insulation, each of said supports in normal conditions being of a height in excess of the inner diameter of the glass tube, said supports being mounted in the glass tube in deformed state and being held therein by elasticity, a filament mounted on the said supports and connected to the electrodes, and connecting means independent of the filament for flexibly connecting the said independent supports.

4. In an electric lamp comprising a glass tube and leads, the combination of a plurality of independent flexible supports of insulation, each of said supports being of a height in excess of the inner diameter of the glass tube, said supports being mounted in the glass tube in deformed state and being held therein by elasticity, a curved suspending means carried by and assuming theform of each of the said deformed supports, a filament mounted upon the said suspending means'and connecting the said leads.

5. In an electric lamp comprising a glass tube and leads, the combination of a plurality of independent flexible supports of insulation mounted in the glass tube, each of said supports having polygonal form and abutting with its corners the inner surface of the glass tube, a filament mounted upon the independent supports and connected to the leads, connecting means independent of the filament for flexibly connecting the said independent supports.

6. In an electric lamp comprising a glass tube and leads, the combination of a plurality of independent flexible supports of insulation mounted in the glass tube, each of the said supports consisting of a plate provided with an upstanding central tongue, a filament carried by the said.- central tongues and connected to the leads, connecting means independent of the filament and connecting the said plates to one another, said plates forming the said independent flexible supports.

'7. In an electric lamp comprising a glass tube and leads, the combination of a plurality of independent flexible supports of insulation mounted in the glass tube, each of said supports consisting of a plate having an upstanding central tongue, a spring disposed on an independent support and abutting the inner surface of the glass tube, a filament carried by said upstanding central tongues of the supports and connected to the leads, connecting means independent of the filament for flexibly connecting the said plates to one another, the said plates forming said independent supports.

MARCEL C I-IARLES PERRIN. JEAN EUGENE VINZANT.