US2258382A - Apparatus for the projection of upright pictures - Google Patents

Description

APPARATUS FOR THE PROJECTION 0F UPRIGHT PICTURES Filed-Dec. 27, 1939 2 Sheets-81196121 In van for Attorney J. GOEBEL Oct. 7, 19 41.

APPARATUS FOR THE PROJECTION 0F UPRIGHT PICTURES Filed Dec. 27, 1939 2 Sheets-Sheet 2 Fig.3

In van for }r-/- z Attorney Patented Oct. 7, 1941 UNITED STATES. PATENT OFFICE APPARATUS FOR THE PROJECTION F UPRIGHT PICTURES Joseph Goebei, Main, Germany Application December 27, 1939, Serial No. 311,114

In Germany January 19, 1939 5 Claims.

It is known to photograph works of literature in strongly reduced size on a film or on a plate and to project these reduced photographs by means of a suitable reading or projection apparal ventlon differs from the known apparatus especially in that the picture holder has on the lower edgetoo'thed rollers which engage with grooves in a shiftable plate of the picture holder. The insertion of the picture holder is in this mam ner simplified, and the desired picture can be brought behind the picture window by a slight pressure exerted by the hand, the picture holder preserving its position adjusted in the plane.

In order to prevent, when pictures or printed matter of different size are to be projected, that a' portion of the next following picture or the like is projected at the same time, a rotatable circular disc with picture windows of different from the grooves e in the side walls and inserted in pairs into sheaths f fixed on the end walls of the box s that they form supports for the removed lid 12 on the inner side of which a mirror g is fixed, this lid being secured in the desired position by means of screws 12. in the ends of the lid. The lid can be adjusted at any desired'height and in accordance with the enlargement to be made.

A. lens 2' is screwed into a carrier is in box a and adjusted by turning in screw threads. On a plate I having transverse grooves forming teeth a shiftable frame m destined to hold the'diapositives is mounted. On the lower end of the shiftable frame a handle is provided in which a toothed roller n is located which meshes with the transverse grooves of plate I. The axle of the.

, toothed roller 11 is slightly pressed against its bearings by means of sliding springs (not shown) This resistance is suflicient to prevent the frame from sliding downwards by gravity. By aslight pressure of the hand the frame 111. holdingthe pictures can be shifted towards both sides as well as forward and rearward without getting out of the plane to which it is adjusted. During the shifting in lateral direction the frame is pre size and shape is arranged close to the picture carrier. The front wall of the box of the apparatus is formed, according to the invention, of interchangeable bars, which when the apparatusis in use are placed the one on the other and in serted in slits in the side walls of the box to serve as carrier for a mirror adapted to be adjusted and secured in diflerent high positions, said mirror forming the lid of the box when tus is not in use.

A projection apparatus is illustrated by way the apparaof example in the accompanying drawings, in

the apparatus is to be used these bars are removed vented by the resistance of the toothed roller from sliding down, whereas during the shifting upward and downward the pressure exerted by the toothed roller onthe teeth formed by the transverse grooves of the plate I prevents undesired sliding of the frame in lateral direction.

This arrangement is evidently particularly suited for the projection of series photographs, which are arranged on a plate the one at the side of the other and in rows the one above the other.

As can be seen from Fig. 1 the diapositives mounted in the shiftalble frame 111. are projected at-an oblique angle upon the mirror g in lid b. When this mirror 9 is in the position shown in Fig. 1 it projects the picture in upright position upon the same plane on which the apparatus stands and in close proximity to this apparatus. This picture can be enlarged or reduced by adlusting the mirror to a higher or lower position. If, however, the mirror is adjusted to another angle, as for instance shown in Fig. 1 in dashed lines, the picture can be projected in upright position onto a screen which'is mounted at any desired distance from the apparatus.

As the photographs, pictures, manuscripts or other matter are of different size, preferably photographs taken in different sizes and in similar reduction, it may be of advantage if the projection admits of a reproduction in the actuof different size, which can be easily brought to in front of the condenser lenses of the projection apparatus by turning. the disc around its central axle p. When the picture window is correctly adjusted, a spring controlled ball q engages in acavity in the circular disc 0.

- to the lid and mirror for adjustable support of The special purpose for which the apparatus 1 serves-requires also a source of light of special type. In order to produce a projection agreeable for the eye at the reading distance of about 30 cmas well as at the distance of several meters, a source of light is necessary which can supply at least two light intensities by simple switching. The switching inof an electric resistance is not suitable, as the light then would change its colour, which has a very prejudicial effect especially at the projection of colored photographs. The employment of 'two interchangeable lamps on the other hand is too complicated. 'For the projection apparatus according to the invention a lamps of known type is provided in which two separately switched systems of incandescent wires are combined. The switching over to higher light intensity is simply effected by switching in both incandescent wire systems at the same time. This lamp presents intensities, but it saves current during the projection at reading distance and prevents an unnecessarily strong heating of the disapositive if not only the advantage to supply different light for instance longer manuscripts have to be read.

A further advantage is the possibility that projections in the reading distance can be clearly read also in lighted rooms when higher light intensity is switched in.

For the switch of the two systems of incandescent wires in, the lamp press button switches 1' are preferably used arranged at the right end of the supporting plate.

I claim:

' 1. A portable projection apparatus for pictures comprising a box having a removable'lid and removable front wall, a mirror on the underside of the lid said front wall comprising a plurality the lid and mirror on the bars above the box,

projection apparatus in the box cooperating with said adjustable mirror for projecting pictures upon a screen, said projection apparatus including a-plate mounted in the box and having a zone of transversely extending grooves termi'nating at opposite side edgesof the plate and forming teeth, a projection lens mounted in the box above said plate, a source of light for said projection lens within the box below said plate in operative allnement with said projection lens, a picture-holding frame shiftably mounted on the plate beneath said projection lens, a toothed roller journaled transversely of the picture-holding frame and engaged with the teeth on said plate and adapted to be operated for shifting the picture-holding frame lengthwise and transversely of said plate to cause a picture mounted 'thereon to register with said lens and a disk rotatably mounted on the said plate to occupy a position underlying the pictures supported on the frame and having a circular series of windows of diiferent sizes for the pictures to be protoothed roller for holding said frame and roller in their shifted positions.

' 4. A projection apparatus as specified in claim 1, wherein said rotatabledisc has a cavity adjacent each picture window and a spring controlled ball on the picture supporting frame adapted to engage with a selected cavity for holding the disc in its rotatably adjusted 'position.'

5. A projection apparatus as specified in claim 1, wherein a multipoiar source of light is provided for the lens and comprises different incandescent wires adapted to be switched in to supply light' of different intensity in one and the same lamp system.

JOSEPH GOEBEL.

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