US2783679A

US2783679A - Tiltable projector base structure with integral socket mount

Info

Publication number: US2783679A
Application number: US367609A
Authority: US
Inventors: Ernest W Goldberg
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-07-13
Filing date: 1953-07-13
Publication date: 1957-03-05
Anticipated expiration: 1974-03-05

Description

March 5, 1957 E. w. GOLDBERG 2,783,679 TIL-TABLE PROJECTOR BASE STRUCTURE WITH INTEGRAL SOCKET MOUNT Filed July 13, 1953 3 Sheets-Sheet 1 mmuuumnum March 1957 w. GOLDBERG 2,783,679

TILTAB PROJECT BASE STRUCTURE WITH INTEGRA OCKET MOUNT Filed July 13, 1953 5 Sheets-Sheet 2 IN V EN TOR.

fine f w zdey y March 5, 1957 E. w. GOLDBERG 2,733,679

TILTABLE PROJECTOR BASE STRUCTURE WITH INTEGRAL SOCKET MOUNT s sheets-sheet 3 Filed July 13, 1953 I 29 INVENTOR. 1777 6 1 71. Goldberg B N .300 30 142'! H United States Patent 9 TILTABLE PROJECTOR BASE STRUCTURE WITH INTEGRAL SOCKET MOUNT Ernest W. Goldberg, Wilmette, Ill.

Application July 13, 1953, Serial No. 367,609

12 Claims. (Cl. 88 -24) This invention pertains to picture projectors and has as its principal object an improved base construction for such devices characterized by the provision of a onepiece molded base shell having an integrally-formed lamp socket structure which is economical to manufacture and assemble and which afiords greatly improved ventilating advantages for the projection lamp as well as the associated optical system.

Another object is the provision of an integral base and socket structure in which the socket portion is provided with formations which locate the lamp receptacle accurately for focusing purposes while affording a range of movement thereto as well as certain air passages for circulation of cooling air in direct contact with the socket receptacle and base portions of a lamp carried therein.

Another object is the provision of a base construction of the class described which includes a simplified tilting structure providing for manipulation of a tilt control knob through a long or slow arcand in a substantially horizontal plane on a deck or ledge portion of the onepiece base shell.

Another object is the provision in a projector of a base construction including a base shell having an integrally formed lamp socket structure and mounted upon pivot logs on a pedestal casting to rock relative to the latter, with a cross-strap held between the pivot lugs and base shell, and a tilting lever pivoted on the cross-strap and angled through a long cam slot on the pedestal and thence up through a long slot in a horizontal ledge in the base shell for ease of access and manipulation in tilting the projector.

A further object is the provision, in a combination base shell and pedestal combination such as last above characterized, of a simple mounting for a blower motor on the cross-strap carried between the pivot lugs and the base shell.

Additional objects and aspects of novelty and utility pertain to details of the construction and operation of the embodiment described hereinafter in view of the annexed drawings, in which:

Fig. 1 is a side elevation of the new projector;

Fig. 2 is another elevational view of the projector as seen in Fig. 1 with the lamp housing and lamp optical system removed;

Fig. 3 is a top plan view of the projector as seen in Fig. 2;

Fig. 4 is a perspective view of the base shell with integral socket structure;

Fig. 5 is a perspective view of the pedestal casting and associated tilting and motor assembly from which the shell of Fig. 4 has been removed;

Fig. 6 is a bottom plan view of the pedestal casting and base shell in assembled condition;

Fig. 7 is a fragmentary bottom plan view, to enlarged scale, of the integral lamp socket structure;

Fig. 8 is a top plan view of the socket structure shown in Fig. 7;

ice

Fig. 9 is a vertical sectional detail through the socket structure as viewed along lines 99 of Fig. 8;

Fig. 10 is another vertical sectional detail through the socket structure taken along lines 1010 of Fig. 9.

Referring to Fig. 1, the projector consists of a pedestal casting 10, upon which is rockably mounted a molded base shell 15 carrying a lens-barrel and slide-bed casting 16 and a removable lamp house 17. By loosening a knurled set screw 18, the lamp house or hood 17 can be removed to expose the lamp system for the purpose of renewing the lamp 19 (Fig. 2) or cleaning the reflector, condensing lenses, etc.

Referring to Fig. 4, the shell member 15 is preferably molded from a suitable plastic material to include an open well portion 20 surrounded on three sides'by a skirt or sidewall portion 15A, and having a lowered deck 21 at the front thereof in which is formed an arcuate slot 22.

Molded integrally with the base shell 15 is a socket structure including a swept-back cross web having rearwardly-raked

arms

23, 23A, and having a central socket cavity 24 shown more particularly in Figs. 7 to 10.

As seen in the bottom view of Fig. 7, the socket well is provided with a pair of diametrically opposite centering or locating bosses 25 (see also Figs. 8 and 9) located on the fore-and-aft or longitudinal axis of the shell and a line parallel to the optical axis through the lamp 19 and projecting lens means 16A, for the purpose of precisely locating the lamp 19 at a predetermined position of focus relative to the optical system.

In order to expose essential details of novelty to view in the several figures of drawing, the source optical system, ordinarily consisting of a concave reflector, a pair of condensing lenses, and a heat absorbing plate, has been omitted. However, it is well understood in the art that the lamp 19 must be critically focused relative to any focusing type reflector and condensing system if the highest optical efficiency is to be procured.

Referring still to Figs. 7 and 8, the socket structure further includes a metal ring or base receptacle 26 to receive the lamp base, and a pair of divergent wings or tabs 27 which are respectively engaged by adjusting screws 28.

As in the enlarged sectional view of Fig. 10, springs 29 are interposed between the mounting wings 27 and the socket body to provide a resilient seating for the lamp and also an adjusting instrumentality.

By turning the screws 28 in or out, the socket shell or receptacle 26 can be rocked transversely of the optical axis to center the lamp filament relative to a reflector (not shown).

The electrical contacts for the socket are completed by a spring contact arm 30 fixed on the web structure by a screw 31, and having an offset contacting end portion 30A underlying the center of the receptacle shell 26.

Referring to Fig. 3, there is provided in the base well, beneath the swept-back socket web 23, a fan 34, the hub portion of which is located beneath the socket well 24, it being important to observe that the foregoing construction, including the spacing of the socket shell 26 by bosses 25, the raking of the

webs

23, 23A, and location of the fan hub beneath the socket shell, affords highest efficiency for cooling the lamp 19 within the limitations of space provided by the entire housing construction.

Thus it will be observed that a maximum unobstructed space is provided in the base well in the region between the lamp 19 and lens barrell 16, so that air can circulate most freely in the region between the lamp and slide bed 16B where it is needed to reduce the heating efiect on the film.

The clearance between the socket shell 26 and well 24 affords a substantial air passage .aroundthe lamp est?- Mqtsq e l there '-t b.s qds rculaticnsbehind the lamp, with the

web structure

23, 23A affording an optimum strength and minimum obstructiveness.

The base structure ,as shown, in the; relatedwiews-of Figs. 4 and '5 provides a simple but. etfi cient .means for mounting the projector base shell,15;and.blower-or fan means 34.

Figs. 4 and 5 are in the relationship of an exploded perspective, in which the base shell 15 has been lifted oil the pedestal casting 10.

The fan means 34 includes a small motor35 carried on a simple cross-bar 36, which fits up againsta pair of bosses 153 on the base ,shelLso as, to. be clamped between the latter and a pair. of ,angle lugs37 pivoted. as

at 38in recessed 'otlsets 39 on the casting. Screws 40.,

are passed up throughtheangle lugs, ,the cross-bar or bearer strap 3f for the motor, andthreadecl into the bosses 15B'on the base shell, thus fixing the motor and fan in position beneath the lamp, and also attacking the shell rockably to the pedestal cas ting, with the motor and fan located at the pivot point for minimized changeof relative positions between the fan and lamp socket structure.

A further feature of noveltyis the means for rocking the projector base shell relative to the pedestalcasting, and'this includes a tilting lever 45 (Fig. 5) pivotally attached as at '46'to the motor bearer strap 36,

The free end of this tilting or rocking lever 45 passes through an inclined slot 47 (Fig. 5) in a plate 48 secured by screws 49 (Fig. 6) to the forward end of the pedestal casting, from whence the lever is offset upwardly as at 45A'to pass through the arcuate slot ZZ irrthe base shell, where the end of the lever engages in a; handle element 50.

By swinging the lever across the slot 22, using handle 50, the lever arm 45, pivoting at 46, rides the sloping slot 47 and causes the base shell '15 and pedestal casting to pivot, relatively, so as to. lower or elevate the lens means 16A relative to a screen or the like.

Actually, the heavy pedestalcasting remains at rest, and the trunnion means, including the two pivot lugs or angles 37 and the cross-strap ,36rock; and since the projector base member or shell is engaged with, and in effect carried by, the trunnion means byengagement of-the bolts 40 in shell bosses 153,- the latter moves responsive to manipulation of the tilt lever means.

'It should be observed," by inspection of Figs. 3 to 6,

that the shaft 34X of-themoto-r fan or blower means substantially underlies the'socket structure and lamp 19, and that the pivotal attachment 46 (Fig. 6) of the tilt leverlies along a line parallel to the rocking axis of the pivot lugs or trunnion means,-sothat between the opposite limits of travel of the tilt lever the axis of the blower fan 34 is displaced relatively little relative to the lamp 19 to insure good cooling-circulation from beneath the lamp in all positions of'tilt.

In this latter connection the annular space between the socket-receptacle orshell 26 (Fig; S and the socket base shell and socket mount and the-increased efiiciencyof the-air flow afforded thereby, not only into the lamp housing generallybut'closelyaround the socket-receptacle shell 26 itself, together with the simple, economical, and

efiective. mounting of-theblower unit on the trunnion means so .asto maintain-the fan in the effective zones in all positions of tilting.

hetfquna ianu t t e c ase s e l, 15 wi h a,,dcck..or. ledge 21 to overlie the free end of the tilt lever affords easy operating access to the tilt knob 50, and a long easy arc of movement for the lever system, giving smooth action throughout its range. Of importance also are the economies and efficiencies attending the attachment of the shell to trunnion lugs 37; :and clamping the motorbearer and trunnion cross-strap between the shell and lugs.

I claim:

1. In a projector, a base structurecomprising a onepiece molded base shell having an upwardly opening well surrounded by depending sidewalls and a forwardly projecting deck having an ;elongated. slot therethrough; an integral web spanning said well and having an integrally formed socket cavity therein; socket means in said cavity aligned by integral positioning bosses in said cavity; a base pedestal; opposite piyotdugs on said pedestal; a

cross,,ba-r,interposed between said lugs and saidshell fastening means engaged in said lugs and bar and said shellto, secure said parts in assembly with the shell. pivotablerelative to -thepedestal; blower means mounted on saidl bar in said well; atilting lever pivoted on said bar and projeeting horizontally through a sloping. cam

slot formation on said pedestal; and tilt. operating means on saiddeck andconnecting with said lever through said elongated slot formanipulation of the tilting lever.

2. In a projector,- a base construction comprisinga heavy pedestal member, a pairof pivot lugs on opposite sides of.said. pedestal. ,member, a tilt lever pivotally con este ithy ai i-pede t em er d t nd na pria lyt ro g chai o mem e fi ed t rede tal.

member; a es e lha naa open o m adap e to fit oversaid. pedestal member,- together with .an open top overlying part, at; least of said pedestal member, saidshell further including a substantially horizontal ur ce .p t q 1 dj n ai pe p d v r in said cam slot member and having a longarcuate slot concentriewith the pivot point of said tilt-lever, an extension of said leyerprojecting through said slot for manual, engagement to pivot said lever and rock said shell relative tosaid pedestal member, said open top portion being adapted. to be closed by a housing member seated thereon.

3, The construction set forth .in claim 2 and further characterized by the provision of a lamp-supporting mem;

berformed integrally with said base shell and extending across said open top.

4. A con s truction according to claim 3 and further characterized bythe provision of blower meansfor a;

lampin saidsupportingmember, and comprising a ,cross-,.

strap held betweensaid pivotiugs and base, shelland having a motor fan secured thereon in a position: Substantially underlying said open top of the shell and the bottom of said lamp;suppo'rt ing member; and a, fan driven I lamp focusing. bosses, lying. along a fore-and -aft line. parallel with the optical axis of the projector; a socketeceptac e eate inn ei Qay tYJ afi Qd pos ti n ain fore-and-aft motion between said,- bosses but having free-r donsoi movement; crosswise, of said optical axis; and means adjustablytmounting:said socket receptacle on said web.and.adjustable to move the receptacle crosswise, as aforesaid.

6. In a projector, a projection lamp socket structure in the molded base shell and comprising a supporting member having an annular cavity therein, a pair of centering bosses on diametrically opposite inside wall portions of said cavity; a socket shell of lesser diameter than said annular cavity seated in the latter between said bosses to fit closely into engagement with the latter to be held in a predetermined position thereby, but having fireedom of movement crosswise of the diameter between said bosses; and adjustable screw means engaged with the socket shell and said supporting member and operable selectively to efiect opposite crosswise adjusting movements of said socket shell.

7. In a projector, a pedestal member; a pair of pivot lugs pivotally attached to opposite sides of said pedestal member; a cross bar extending crosswise of said pedestal member and seated upon said lugs; a tilt lever having one end pivotally attached to a mid-portion of said cross bar to extend toward one end of the pedestal member; a stationary cam member at said one end of the pedestal member having formed therein an upwardly rising cam slot through which a free end portion of the tilt lever projects; and a motor fan unit fixed to said cross bar with a fan shaft substantially concentric with the pivotal axis of said lever, and a projector base member secured to said pivot lugs so that there is relative rocking move ment between the base member and pedestal member responsive to pivotal movement of said tilt lever with the axis of said fan shaft undergoing a minimized displacement relative to overlying parts of said projector base member between the limits of rocking movement of the same relative to the pedestal member.

8. In a picture projector, a combination base-shell and socket-mounting structure comprising: a hollow one-piece body having a bottom opening and a top opening thereabove with integrally-formed cross web member having formed as an integral part thereof a seating formation for a lamp support with substantial open areas of airflow space about said seating formation for passage of cooling air upwardly there past from the region of said open bottom.

9. The construction of claim 8 further characterized by the provision of a pedestal body having a ring-like member having extensive open areas within its confines and dimensioned to lie within the bottom confines of said base shell; a cross-support and pivot means mounting the same crosswise of said ring-like member; air-moving means mounted on said cross-support to rock therewith and in position to displace lamp-cooling air upwardly through said open top and past said lamp-supporting formation; together with means interconnecting said base shell with said cross-support to rock therewith; and mechanism operable to rock said cross-support relative to said ringlike member.

10. A tilting base structure for a picture projector comprising a pedestal adapted to rest upon a support; a rockable member extending crosswise of said pedestal; means pivotally attaching said rockable member on the pedestal; a tilting lever having one end pivotally mounted on said rockable member with an opposite end portion extending in a generally horizontal sense toward an end of the pedestal, an upright member on said pedestal extending crosswise of the latter near said end of the same and having an upwardly inclined cam slot therein extending in a direction generally crosswise of the pedestal; said opposite end of the tilt lever passing through said slot and acting in the latter responsive to pivotal movement of the lever to rock said rockable member relative to the pedestal, the rockable member being adapted to have connection with a member to be rocked therewith.

11. A lamp socket structure for a picture projector comprising a member having a cavity therein adapted to receive a socket mounting member having a crosswise dimension smaller than a crosswise dimension of said cavity and disposed in the cavity to rock in the latter at least in the direction of said dimensions, formations in the cavity closely flanking the socket mounting member to prevent rocking thereof as aforesaid, and means extending from said socket mounting member in opposite directions in the cavity along a line transverse to the line of the aforesaid crosswise dimension and adjustably attached to the cavity member by screw and spring means operable to rock the socket supporting member along the line of said transverse dimension.

12. A focusing type lamp socket for a picture projector comprising a body having a cavity, a socket shell in said cavity and smaller in diameter than the cavity at least in one predetermined transverse line of direction across the latter; stop means in the cavity flanking the socket shell along a diametric axis at substantially right angles to said transverse-line and limiting rocking movement of the shell in the direction of said axis; transversely extending mounting members projecting from opposite sides of the shell; spring means acting on said mounting members to urge the shell in a predetermined direction from said transverse line, and attaching means loosely attaching said projecting members of the shell to said body so that the shell may move under urgence of said spring means as aforesaid, the attaching means for at least one of said projecting members being adjustably movable back and forth along the line of action. of the appertaining spring means for adjusting operation to rock the shell transversely into desired positions of adjustment for purposes of focusing a lamp in (the socket.

References Cited in the file of this patent UNITED STATES PATENTS 1,714,712 Everett May 28, 1929 2,169,010 Teague et al. Aug. 8, 1939 2,194,366 Ott Mar. 19, 1940 2,366,554 Peck et al Jan. 2, 1945 2,477,107 Wolfe July 26, 1949 2,598,573 Lutes May 27, 1952 2,614,458 Critoph et al. Oct. 21, 1952 2,625,077 Goldberg Ian. 13, 1953