US1752951A

US1752951A - Picture-projecting machine

Info

Publication number: US1752951A
Application number: US300229A
Authority: US
Inventors: Albert S Howell
Original assignee: Bell and Howell Co
Current assignee: Bell and Howell Co
Priority date: 1928-08-17
Filing date: 1928-08-17
Publication date: 1930-04-01
Anticipated expiration: 1947-04-01

Description

April 1, 1930. v A. s. HOWELL PICTURE PROJECTING MACHINE Filed Aug. 17, 1928 2 Sheets-Sheet 1 April 1930. A. s. HOWELL 1,752,951

PICTURE PROJECTING MACHINE Filed Aug. 17, 1928 2 Sheets-Sheet 2 452M822???- B warzJ/w/Z 5M 27% y:

Patented Apr. 1, 1930 UNITED STATES PATENT OFFICE ALBERT S. HOWELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BELL 80 HOWELL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS PICTURE-P3051 ECTING MACHINE Application filed August 17, 1928. Serial No. 300,229.

My invention relates to motion picture projecting machines although not limited to this use alone.

The general objects of my invention re- 5 side in the provision of a simple, effective and convenient means whereby a picture projecting machine may be adjusted to project pictures to a desired positiori, and which is particularly adapted to a projecting machine 10 which is foldable into compact form for storage and transportation.

With these objects in View my inventlon consists in certain features of novelty in the of parts by which the said objects and certain other objects, hereinafter appearing, are effected, all as fully described with reference to the accompanying drawings and more particularly pointed out in the appended claims.

In the said drawings-- Figure 1 is a side elevation of a motion picture projecting machine embodying my invention and extended or unfolded and ready for use;

Figure 2 1s a similar view with the machine folded for storage and transportation and with parts broken away and in section;

Figure 3 is an enlarged similar side elevation of a portion of the machine;

Figure 4 is a section on the line 4 1 of Fi ure 2; and

igure 5 is an enlarged perspective view of a portion of the mechanism. I

Like characters of reference indicate like parts in the several views.

Referring-to the drawings, the motion picture projecting machine illustrated is similar to that descri ed and claimed in U. S. Let- 1926, for improvement in motion .picture projecting machine and the like, and requires no detailed description for the present purposes. The machine includes a base or supporting member comprising a hollow standard 1 and a laterally extending base 2 at the bottom of the standard, and a composite frame 3, carrying the mechanism and projecting devices of the machine, is pivotally supported on the upper end of the standard on an axis transverse thereto by means of a headed pivot construction, combination and arrangement ters Patent No. 1,587 ,955, granted June 8,

stud screw 4 passing through a bore through the upper end of the standard 1 and screwthreaded into a pivot extension 5 on the frame 3. See Figures 1 to 4 inclusive.

As so supported on the base the frame 3 is pivotally movable into and out of a folded position adjacent the base. Figure 2 shows the frame 3 in its folded position adjacent the base and Figure 1 shows this frame out of this ,position and in an extended relation with respect to the base ready for the operation of the machine.

A crank stud 6 is fixed on the extension 5 of the frame 3 adjacent the pivotal axis of this frame and projects into the enclosure of the standard 1 through an arcuate slot 7 in the standard and arranged on an axiscoincident with that of the pivot stud 4, this arcuate slot 7 permitting movement of the crank stud 6 with the frame 3 in its pivotal movement aforementioned. See Figures 2 and 4. An apertured plate 8 is secured within the standard 1 adjacent the lower end thereof, and a rod 9, also within the standard, is slidably engaged in the aperture of this plate and extending upwardly therefrom engages upwardly against the crank stud 6 with its uppenendiwhich is V-shaped, as designated at 11 in Figure 2, to maintain the rod engaged with this stud.

A helical compression spring 12 encircles the rod 9 and abuts downwardly on the plate 8, and the upper end of this spring abuts a slotted washer 13 engaged in a circumferential groove 14 on the rod, see Figure 5, to form a shoulder on the rod.

As so arranged the spring urges the rod 9 upwardly against the stud 6 to yieldably urge the frame 3 in a direction away from "its folded position when the frame has an threaded a manually operated adjusting stop screw 16, see Figures 1, 2 and 3, which engages the frame 3 to adjustably position the frame 3 in its extended relation with respect to the base against the influence of the spring 12, the spring holding the frame 3 against the screw 16 so that the frame 3 may be adjusted in either direction by manipulating this screw.

Thus it will be observed that a convenient means is provided for the adjustment of the frame 3 to project at-desired points vertically, the horizontal adjustment of the machine for this purpose being effected by bodily turnin the machine.

t will also be observed that the construction permits of the convenient folding of the machine, and that the spring 12 and related parts are desirably concealed =within the standard.

lVhile I have described and shown the preferred embodiment of my invention I do not wish to be limited to the precise details of construction 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:

1. In a picture projecting machine the combination with a supporting member provided with a hollow standard and a supported member pivotally mounted on said standard on an axis transverse thereto, of spring means within said standard and yieldably urging said supported member in one direction with respect to said supporting member, and manually controlled adjusting means for operating said supported member in the opposite direction with respect to said supporting member. a i

2. In a picture projecting machine the combination with a supporting member and a supported member pivotally mounted thereon for movement into and out of a folded position adjacent said supporting member,

of a crank on one of said members, spring means operating on said crank for yieldably urging said supported, member in a direction away from said position when said supported member has an extended relation with said supportingmember, said crank being disposed to prevent movement of said sup ported member out of said position by said spring means, and means for, adjustably positioning said supported member in said extended relation against the influence of said spring.

3. In a picture projecting machine the combination with a supporting member and a supported member pivotally mounted thereon for movement into, and out of a folded position adjacent said supporting member, of a crank on one of said members, spring means operating on said crank and reacting on the other of said members for yieldably urging said supported member in a direction away from said position when said supported member has an extended relation with said supporting member, said crank being disposed substantially at dead center when said supported member is in said position, and a manually operated stop screw screwthreaded on one of said members for adjustably positioning said supported member in said extended relation against the infiuence of said spring.

4;. In a picture projecting machine the combination with a supporting member comprising a hollow standard and a laterally extending base at the bottom of the standard, and a supported member pivotally mounted on the upper end of the standard on an axis transverse thereto for movement into and out of a folded position adjacent said supporting member, of a crank on said supported member adjacent its pivotal axis and projecting into the enclosure of said standard, an apertured formation within the standard adjacent its lower end and fixed therewith, a rod within said standard and slidably engaged in the aperture of said formation and engaging said crank, a helical compression spring encircling said rod and abutting downwardly on said formation, shoulder means on said rod above said spring and against which said spring acts to urge the rod upwardly against said crank to yieldably urge said supported member in a direction away from said position when said supported member has an extended relation with said supporting member, said crank being disposed substantially at dead center when said supported member is in said position, and a manually operated stop screw screwthreaded on one of said members for adjustably positioning said supported member in said extended relation against the influence