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Publication numberUS1598444 A
Publication typeGrant
Publication dateAug 31, 1926
Filing dateMar 30, 1923
Priority dateMar 30, 1923
Publication numberUS 1598444 A, US 1598444A, US-A-1598444, US1598444 A, US1598444A
InventorsHowell Albert S
Original AssigneeBell & Howell Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Motion-picture machine and the like
US 1598444 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

A. S. HOWELL MOTION PICTURE MACHINE AND THE LIKE Filed March 30, 1923 3 Sheets-Shoat 1 Aug. 31 1926.

' 1,598,444 A. s. HOWELL MOTION PICTURE MACHINE AND THE LIKE Filed March so. 1923 I s Shoots-Shut 2 29 fig-5 4e J a; a] .1. 7. .wlf as f M p v 49 lhufliarw- Q/erl 6 flaw/Z Aug. 31 1926. 1,598,444

' A. s. HOWELL IOTICN PICTURE MACHINE AND THE LIKE Filed March 30, 1923 3 Shoots-Shoat :5

Patented Aug. i 31, 1926.

UNITED STATES PATENT OFFICE.

ALBERT s. HOWELL, or cnrcaoo, IiLINOIS, assmnon 'ro mm. a nowam. conirm,

01'' 011101100, rumors, A coaroaarron or rumors MOTION-PICTURE MACHINE AND THE LIKE.

Application filed March 30, 1923. Serial No. 628,862.

My invention relates particularly to motion picture projecting machines and the like involving the use ofelectrically energized devices although not limited to this use alone.

In the use of motion picture machines and the like involving the use of electrically energized devices it is common to provide electric current controlling resistances either fixed or variable for controlling the current to the electrical devices particularly for reducing the current thereto. The resistances usually employed, ordinarily separate from the machines, are large and cumbersome and usually become quite hot in operation. Their use with portable machines is particularly disadvantageous.

Generally the features of my invention relate to the provision in a motion picture machine or the like involving the use of electrically energized devices and an electric current controlling resistance means with a view toward providing a compact, practical, efficient, simply operated and controlled machine complete in itself and dispensing with the usual resistances and attendant disadvantages.

With these features in view my invention consists'in certain features of novelty in the construction, combination and arrangement of parts by which the said features and certain other features are effected, all as fully described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawings Figure 1 is a partial top plan view of a motion picture projecting machine with parts broken away.

Figure 2 is a sectional view taken on the line 22 of Fig. 1.

Figure 3 is a partial section taken on the line 3-3 of Fig. 1.

Figure 4 is a partial side elevation of the lamp chamber with the cover of -the terminal chamber, hereinafter described, broken away.

Figure 5 is a diagrammatic view showing the circuit connections of the machine. 1

Figure 6 is a top plan view'of the resistance unit hereinafter. described.v '1 Figure 7 is a bottom plan view ,of theresistance unit.

Like characters of reference indicate like parts in the'various views.

In the said drawings 1 designates a lamp chamber at one side of which and formed integrally. therewith is an electric driving motor housing 2. See Fig. 1. The front of the lamp chamber and motor housing is faced in a transverse plane, and secured against this face and extending in front of the lamp chamber and motor housing is an air chamber casing 3 forming an air chamher 4 extending across the front of the lamp chamber and motor casing. An electric driving motor 5 is disposed within the motor casing 2 with its shaft 6 extending forwardly through the air chamber into a gear casing 6, secured to the front of the air chamber casing, for driving the film feeding mechanism and light shutter associated with the gear casing.

The air chamber 4 communicates with the lamp chamber through openings 7 in the lamp chamber casing for the passage of air from the air chamber into the lamp chamber and upwardly therethrough. See Figs. 1 and 3. A centrifugal air impeller is disposed within the air chamber 4 and comprises a web 8 secured at the rear end of a hub member 9, which is secured to the motor shaft 6, and impeller blades 11 formed from the web. See Figs. 1 and 2. The blades 11 throw the air outwardl during rotation of. the motor shaft, the air eing drawn through openings 12 in the motor casmg and through the openings of a spider formation 13 which supports a bearing 14 of .the motor shaft at the front end ofthe motor. The air chamber casing around the impeller is formed eccentrically therewith to direct the air thrown from the impeller blades into the portion of the air chamber in front of-the lamp chamber, and the main portion of the air current passes therefrom through the openings 7 into the lamp chamber 2 and upwardly therethrough, and discharges at the top thereof.

The lamp chamber 2 has intermediate front light opening therein into the air chamber and a condensing lens 15 is mounted in said light opening on an axis extend ing forwardly and rearwar-dly, and an incandesclent electric lamp 16 having a concentrated filament is mounted in the lamp chamher in alinement with the condensing lens. The light passes forwardly from the condensing lens through an opening 17 in a transverse front partition wall 18 of the air toward the motor shaft and a deflecting blade 19 is associated therewith for conducting a portion of the air current from the air chamber 4 upon the film at a light opening 21, alined with the condensing lens of an intermittent film food guide 22 disposed in front of the wall18. See Fig. 2.

The machine hereinabove partially described is fully described and claimed in my co-pending application, Serial No. 572170, liled July 1,1922, for improvement in mo tion picture projecting machines and the like, and further description herein is unnecessary.

The top of the lamp chamber is formed by an inverted cup shaped body part 23 of insulating material having the transverse wall thereof perforated, as indicated at 24, for the passage of the air current therethrough. See Figs. 3, 6, and 7. This top part 23 is removably attached to the main portion of the lamp chamber casingby means of headed screws 25 extending through holes in the body part 23 and screwthreaded into the lamp chamber casing. Suspended in the body part 23 are two sections 26 of coiled nichrome resistance wire having substantially the same resistance and extending back and forth across the enclosure of the body part and having sections 27 disposed in spaced planes and sections 28 extending between and connecting sections of different planes. This arrangement of the resistance wire provides for the free passage of air thereby and the dissipation of a large amount of heat therein, and at the same time permits of a Very compact arrangement. The resistance wire is supported by spaced metal anchor hooks 29 secured in the body part 23 and supporting the wire at the ends of the extending sections thereof. The sections 26 of the resistance wire are disposed on respective sides of a diameter of the body part 23 and the inner ends of their coiled portions are supported on one of the anchor hooks 29 from which the adjacent ends 31 of the wires extend downwardly. A pair of screw terminals 32 are mounted on the body part 23 interiorly thereof and adjacent the mouth of the body part, and the downwardly extending ends 31 are clamped in one of these screw terminals, thus connecting the two sections of resistance wire at their inner ends. The extreme outer ends of the two sections 26 of resistance wire extend downwardly from the last outer anchor hooks and one of these ends extends across, as designated at 33, below the extending sections of the resistance wire and is clamped in the other screw terminal 32. The extreme outer end of the other section 26 of resistance wire extends across, as designated at 34, below the extending sections of the resistance wire and is twisted upon the extending end 33, thus forming a connection therewith. The two sections 26 of resistance wire are thus connected in parallel to effect a relatively large amount of radiating surface, and whereby, where as in the present case the resistance functions to reduce the current to the lamp 16, lamps differing in current characteristics to a considerable extent may be used interchange ably without injury to the lamps or resistance. In operation the air current passing upwardly through the lamp chamber dissipates heat from both the lamp and resistance and maintains both at proper operating temperatures, and by reason of the air current striking the lamp first no heat is transmitted to the lamp from the resistance.

N ichrome resistance wire is extremely well adapted for the purpose because of its high electric-a1 resistance and its resistance to oxidation or disintegration.

The lam 16 is mounted in a socket facing upwar ly in the lamp chamber 1 at the bottom thereof. The socket proper and the base of the lamp adapted therefor are fully described and claimed in my co-pending application, Serial N 0. 620,821, filed February 23, 1923, for improvement in incandescent electric lamp socket, lamp and adaptor there for, and a detailed description is unnecessary for the present purpose. This socketcomprises a body 35 of molded insulating material into which are molded the opposite conductive members 36 of the socket. A terminalchamber 37 is formed on the body 35, and the terminal chamber is provided with a cover 38 removably secured thereto. The opposite conductive members 36 have extensions 39 formed thereon which extend into the terminal chamber and form socket terminals 41 therein. A bus terminal 42 is mounted in the terminal chamber. A switch 43 of usual construction is also mounted in the terminal chamber and is operated into open or closed position by an exposed knob 44. The circuit connections are as follows. A pair of insulated conductors 45 are clamped in respective terminal screws 32 and lead downwardly therefrom in the lamp chamber 1 into the terminal chamber 37 through openings in the body 35, and one of these conductors is connected on one socket ter minal 41 and the other is connected on the bus terminal 42. An insulated conductor 46 is connected at its opposite ends to the other socket terminal 41 and to one terminal 47 of the switch 43, and an insulated conductor 48 connects the same terminal 47 of the switch with one terminal of the motor 5. An insulated conductor 49 connects the Inn other terminal of the motor 5 with the terminal 42, and a pair of insulated conductors 51 are connected respectively with the other- The above described arrangement provides a simple and convenient wiring arrangement in which a large number of connections are concentrated in the terminal box with obvious advantage and in which the conductors are enclosed to a large extent.

The resistance above described is connected in shunt with the lamp socket for reducing the current to the lamp 16, and the motor takes the full current from the source 53.

The switch 43 controls the current to both the motor circuit and to the lamp and resistance circuit and opens and closes both circuits to ether whereby an air current is maintaine throu h the air chamber and upon the lamp an resistance whenever current is passed through the lamp and resistance.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit of my invention, but having thus described my invention, I claim as new and desire to secure by Letters Patent the following Claims.

'1. A motion picture machine includlng a lampchamber arranged for the passage of air upwardly therethrough, means for maintaining a current of air upwardly through the lamp chamber, and an electrlc current controlling resistance associated with the lamp chamber above an electric lamp therein and in circuit with the lamp and comprising coiled resistance wire suspended in the chamber and extending back and forth across the same above the lamp for the dissipation of heat in said air current.

2. A motion picture machine including a lampchamber arranged for the passage of air upwardly therethrough, means for maintaining a current of air upwardly through the lamp chamber, and an electric current controlling resistance associated with the lamp chamber above an electric lamp therein and in circuit with the lamp and comprising two sections of coiled nichrome wire connected in parallel and suspended in the lam chamber abovethe lamp and extending bac and forth across the path of said air current and having sections disposed in spaced planes and sections extending between and connecting sections of the several planes for the dissipation of heat in said air current.

3. The combination with a chamber arranged for the passage ofair therethrough, of means for maintaining a current of air through the chamber, and an electric current controlling resistance comprising two sections of coiled nichrome wire connecte in arallel and suspended in said chamber an path of said air current and having sections extending back and forth across the disposed in spaced planes and sections extending between and connecting sections of the several planes.

4. A resistance including a cup shaped body part of insulating material having the transverse wall thereof perforated for the passage of air, coiled nichrome resistance wire extending back and forth across the enclosure of the body part and having sections disposed in spaced planes and sections extending between and connecting sections of different planes, and spaced metal anchor hooks secured in the body part and support ing the resistance wire at the ends of the extending sections thereof.

5. A resistance including a cup shaped body part of insulating material having thetransverse wall thereof perforatedfor the passage of air, two sections of coiled nichrome resistance wire connected in par- .allel and extending back and forth across the enclosure of the body part and having sections disposed in spaced planes and sections extending between and connecti-n sections of different planes, spaced metal anchor hooks secured in the body part and supporting the resistance wire at the ends of the extending sections thereof, and screw terminals mounted on said body part interiorly thereof and adjacent the mouth of the body part and forming terminals for the resistance wire.

6. The combination with an incandescent electric lamp chamber adapted for the passage of an air current, upwardly therethrough and provided with a top portion of insulating material through which the air current passes, of coiled resistance wire in said top portion and extending back and forth across the enclosure of said top portion and having sections disposed in spaced planes and sections extending, between and connecting respective sections ofthe several planes, and a plurality of spaced metal anchors secured in said 'top portion and supporting the resistance wire at the ends of said sections.

7. The combination with an incandescent electric lamp chamber adapted for the passage of an air current upwardly therethrough and provided with a removable inverted cu shaped top portion of insulating material aving the transverse wall thereof perforated for the, passage of the air cur-I rent therethrough, of coiled nichrome resistance wire in said top portion and extendin back and forth across the enclosure of sai top portion and having sections disposed in spaced planes and sections extending bed chor hooks secured to said top portionand supporting the resistance wire at the ends of said sections, and screw termmals mounted on said top portion interiorly and adjacent the mouth thereof and forming terminals for the resistance wire.

8. The combination with a lamp chamber arranged for the passage of air therethrough, of an electric lamp socket facing in the chamber, a terminal box associated with the socket, an electric current controlling resistance associated with the lamp chamber for the dissipation of heat in an air current through the chamber, and circuit connections whereby the resistance controls the current through a lamp in the socket and whereby the lamp circuit is energized including conductors leading from the socket and resistance into the terminal box and terminals in the terminal box.

9. A motion picture machine including a lamp chamber arranged for the passage of a current of air upwardly therethrough, an electric lamp socket facing upwardly in the chamber at the bottom thereof, a terminal chamber associated with the lamp socket, an electric current controlling resistance associated with the lamp chamber above a lamp in said socket for the dissipation of heat in said air current, an electric motor, an air impeller driven by the motor for maintaining a current of air upwardly through said lamp chamber, a switch in said terminal chamber, and circuit connections whereby the resistance is connected in circuit with the lamp for reducing the current thereto, and whereby the motor circuit and lamp and resistance circuit are connected through the switch from a common source of electricity including conductors leading from the lamp, resistance, and motor into the terminal chamber and terminals in said ter minal chamber.

10. A motion picture machine including a lamp chamber arranged for the passage of air therethrough, an electric lamp socket facing in the chamber and comprising a body part forming a terminal chamber, extensions on the opposite conductive members of the socket extending into the terminal chamber and forming terminals therein, an electric driving motor, an air impeller driven by the motor for maintaining a current of air through the lamp chamber, an electric current controlling resistance associated with the lamp chamber for the dissipation of heat in said air current, a switch in said terminal chamber, and circuit connections cooperating with said extensions and terminals whereby the resistance is connected in circuit with the lamp for reducing the current thereto and whereby the motor circuit and lamp and resistance circuit are energized through the switch from a common source of electricity including conductors leading from the resistance and motor into the terminal chamber.

11. A motion picture machine including a lamp chamber arranged for the passage of air upwardly therethrough, an electric lamp socket facing upwardly'in the chamber at the bottom thereof and comprising a body part forming a terminal chamber, extensions on the opposite conductive members of the socket extending into the terminal chamber and forming terminals therein, an electric driving motor, an air impeller driven by the motor formaintaining a current of air upwardly through the chamber, an electric current controlling resistance comprising nichrome wire suspended in the lamp chamberabove a lamp in said socket for the dissipation of heat in said air current, a switch in said terminal chamber and circuit connections cooperating with saidextensions and terminals whereby the resistance is connected in circuit with said socket for reducin the current to the lamp in the socket and w iereby the motor circuit and the lamp and resistance circuit are energized through the switch from a common source of electricity including conductors leading from the motor into the terminal chamber and conductors leading from the resistance downwardly in the lamp chamber into the terminal chamber.

In witness whereof I hereunto affix my signature this 28th day of March, 1923.

ALBERT S. HOWELL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2562600 *Dec 17, 1948Jul 31, 1951Cadwell CorpVentilating fan for picture projecting apparatus
US2568895 *Feb 11, 1948Sep 25, 1951G M Lab IncSlide projector with cooling fan and motor assembly
US2754723 *Apr 14, 1952Jul 17, 1956Bauer Eugen GmbhMotion picture projector combination with lamp housing and air cooling means
US6793349Oct 28, 2002Sep 21, 2004Rosco Laboratories, Inc.Image projector for use with luminaires
Classifications
U.S. Classification352/202, 362/294, 362/373
International ClassificationG03B21/20
Cooperative ClassificationG03B21/20
European ClassificationG03B21/20