Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2562600 A
Publication typeGrant
Publication dateJul 31, 1951
Filing dateDec 17, 1948
Priority dateDec 17, 1948
Publication numberUS 2562600 A, US 2562600A, US-A-2562600, US2562600 A, US2562600A
InventorsFrank M Adamson, Clarence J Cadwell
Original AssigneeCadwell Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ventilating fan for picture projecting apparatus
US 2562600 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

y 1951 c. J. CADWELL ET AL 2,562,600

VENTILATING FANS FOR PICTURE PROJECTING APPARATUS Filed D80. 17, 1948 I N VEN TORS 6207291212 ll Cadwell fianlz'ljffl'da'morz Patented July 31, 1951 UNITED STATES PATENT OFFICE VENTILATING FAN FOR PICTURE PROJECTING APPARATUS Application December 17, 1948, Serial No. 65,897

3 Claims. 1 I

The invention relates to a fan for picture projecting apparatus and it is an object of the invention to provide a device of this kind whereby the heat generated by the lamp within the lamp housing in the shell of the machine is quickly dispersed to maintain the machine cool throughout the period it is in operation.

It is also an object of the invention to provide a means for dispersing the heat generated within the apparatus whereby it is possible to safely use a lamp or bulb of high wattage.

Furthermore, it is an object of the invention to provide a fan for position exteriorly of the shell of the projecting machine to draw out from the shell and disperse exteriorly thereof the air heated within the shell or more particularly the lamp housing within the shell.

The invention consists in the details of construction and in the combination and arrangement of the several parts of our improved fan for picture projecting apparatus, whereby certain advantages are attained, as will be hereinafter more fully set forth.

In order that our invention may be better understood, we will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a fragmentary view in section with parts in elevation illustrating a fan embodying the invention in applied position; and

Figure 2 is a fragmentary view in top plan of Figure 1 with a portion broken away.

As illustrated in the accompanying drawings S denotes the shell or outside casing of a picture projecting machine of a general type as used in connection with still or moving pictures. Positioned in the shell or casing S is a lamp H of a conventional type in which is placed the usual light B. The top wall I of the shell or casing s is provided with the louvered vents 2 directly along the lamp housing for the escape of the heated air within the shell or casing S.

The vents l themselves, however, do not allow for the escape of air in sufiicient volume to maintain cooling of the walls 2 of the shell or casing S or to permit the use of a bulb of high wattage. These disadvantages are overcome by drawing out the heated air within the housing in a manner whereby the walls of the shell or housing S are maintained cool and a bulb or lamp of high wattage may be used with safety especially with respect to the film or slides being used.

A relatively short sleeve 3 is positioned on the top wall I of the shell or casing S and surrounding the vents 2. In the present embodiment 2 of the invention the collar 3 is detachably held as at 4 to the top wall 1 so that the same may be applied or removed as desired.

Extending inwardly from the outer or upper end portion of the sleeve 3 are the diametrically opposed arms 5. These arms 5 are substantially in alinement and are secured, as at 6, by screw or the like, to bracket 1 carried by the field ring a of the motor M. These arms 5 not only support the motor M in desired position but provide means to hold the field ring or against rotation.

The shaft 8 of the motor M is upwardly disposed and has fixed to its upper extremity the axial center of the top head 9 of the fan F. This fan F comprises a cylindrical wall [0 depending from the peripheral portion of the head 9 and open at its bottom or lower end. The wall member I0 is substantially housing the motor M.

The cylindrical wall [0 has struck therefrom and extending from substantially one end to the other the blades I l providing air slots [2 between each pair of blades ll. These blades H are equidistantly spaced and are arranged entirely around the wall In. The blades II are also on such pitch to provide means for creating such suction within the shell or housing S to withdraw therefrom and disperse out into the atmosphere the heated air with the shell or casing S and in such volume to assure the maintenance of the shell or casing S substantially free of heat.

At predetermined spaced points therearound the upper or outer end portion of the collar 3, are the outwardly disposed ears l4 to which are secured the upstanding posts l5 which extend upwardly into a dome D and have close contact within the lower free marginal portion of the side wall 16 of the dome D. The wall It; may be secured to the posts Is in any desired manner, as by screws H.

The side wall l6 and the top wall [8 of the dome D is imperforate and the lower or open end of the dome is of a diameter to extend a distance materially outwardly from the collar 3 whereby a discharge opening is provided surrounding the collar 3 and through which is discharged the air after being drawn out from within the shell or casing S.

We claim:

1. In combination, a picture projecting machine including a casing having an exhaust opening through a wall thereof, a sleeve mounted on said wall exteriorly of the casing and surrounding the discharge opening, a downwardly facing hood carried by the sleeve and positioned thereabove, said hood having its lower face open and of a diameter greater than the diameter of the sleeve, a shaft disposed axially of the sleeve and supported thereby, said shaft being of a length to extend a distance within the hood, means for rotating the shaft, a head carried by the outer end portion of the shaft, and a wall extending from the peripheral portion of the head toward the sleeve, said wall having blades struck therefrom and providing openings between adjacent blades.

2. In combination, a picture projecting machine including a casing having an exhaust opening through a wall thereof, a sleeve mounted on said wall exteriorly of the casing and surrounding the discharge opening, a downwardly facing hood carried by the sleeve and positioned thereabove,

said hood having its lower face open and of a diameter greater than the diameter of the sleeve, a shaft disposed axially of the sleeve and supported thereby, said shaft being of a length to extend a distance within the hood, means for rotating the shaft, a head carried by the outer end portion of the shaft, and a wall extending from the peripheral portion of the head toward the sleeve, said wall having blades struck therefrom and providing openings between adjacent blades, said wall being of substantially the same diameter as the sleeve and terminating closely adjacent thereto.

3. In combination, a picture projecting machine including a casing having an exhaust opening through a wall thereof, a sleeve mounted on said wall exteriorly of the casing and surrounding the discharge opening, a hood carried by and concentric with the sleeve, and said hood having a circular open side spaced from and directed toward said wall, said circular open side being of a diameter greater than the diameter of the sleeve, a motor unit having a field ring and an armature therein, means supporting the motor unit in the center of the outer end of the sleeve with the turning axis of the armature concentric with the sleeve, a shaft supporting the armature and having an end extending outwardly into the hood, and a suction fan carried upon the outer end of the shaft within the hood, said suction fan comprising a cylindrical body having a head and a wall extending from the head toward the sleeve, said wall having blades struck therefrom providing openings between the blades, and said motor being encircled by the wall and partially disposed within the fan body.

CLARENCE J. CADWELL.

FRANK M. ADAMSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,409,199 Roth Mar. 14, 1922 1,598,444 Howell Aug. 31, 1926 1,937,379 Berg Nov. 28, 1933 2,027,679 Debrie Jan. 14, 1936 2,027,680 Debrie Jan. 14, 1936 2,126,230 Troxell Aug. 9, 1938 2,153,576 Kurth et al Apr..11, 1939 2,165,681 Stechbart July 11, 1939 2,186,618 Philips Jan. 9, 1940 2,269,794 Stechbart Jan. 18, 1942 2,288,345 DeVry June 30, 1942

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1409199 *Apr 15, 1920Mar 14, 1922Roth Adolph FExhaust fan
US1598444 *Mar 30, 1923Aug 31, 1926Bell & Howell CoMotion-picture machine and the like
US1937379 *Dec 7, 1929Nov 28, 1933Frederick A BergHigh intensity multiple arc projection lamp machine
US2027679 *Nov 1, 1934Jan 14, 1936Clement Debrie Andre Leon VictCinematographic projector
US2027680 *Dec 11, 1934Jan 14, 1936Debrie Andre Leon Vict ClementProjecting machine for sound cinematographs
US2126230 *Aug 18, 1934Aug 9, 1938Ralph P ClarksonDistributing means
US2153576 *Oct 27, 1936Apr 11, 1939Anemostat Corp AmericaAir supply device
US2165681 *Dec 10, 1936Jul 11, 1939Bell & Howell CoProjection lamp house and lamp mounting adapted therefor
US2186618 *Apr 27, 1937Jan 9, 1940Eastman Kodak CoLamp house construction
US2269794 *Jul 17, 1939Jan 13, 1942Bell & Howell CoVentilated lamp house
US2288345 *May 31, 1940Jun 30, 1942Vry Corp DeProjector or the like
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3250175 *Aug 4, 1961May 10, 1966Braun AgOptical projector with transverse flow blower and compartmentalized housing
US3960063 *Jul 18, 1974Jun 1, 1976Blech- Und Metallwarenfabrik Robert Fischbach KgRoof fan
US6497553 *Mar 16, 2001Dec 24, 2002Vortex Holding CompanyVortex attractor
US6979169Nov 21, 2003Dec 27, 2005Broan-Nutone LlcModular ventilating exhaust fan assembly and method
US7040763 *Apr 30, 2004May 9, 2006Hitachi, Ltd.Image display device
US7128303Apr 2, 2004Oct 31, 2006Broan-Nu Tone LlcFan mounting spacer assembly
US7175309Nov 14, 2003Feb 13, 2007Broan-Nutone LlcLighting and ventilating apparatus and method
US7203416Nov 21, 2003Apr 10, 2007Broan-Nutone LlcVentilating and heating apparatus with heater shielded by tapered discharge duct
US7455432Feb 13, 2007Nov 25, 2008Broan-Nutone LlcLighting and ventilating apparatus and method
US7455500Dec 6, 2005Nov 25, 2008Broan-Nu Tone LlcModular ventilating exhaust fan assembly and method
US8434916Nov 25, 2008May 7, 2013Broan NuTone, LLCLighting and ventilating apparatus and method
Classifications
U.S. Classification353/61, 362/294, 415/208.1
International ClassificationG03B21/16
Cooperative ClassificationG03B21/16
European ClassificationG03B21/16