US1644781A

US1644781A - Projecting apparatus

Info

Publication number: US1644781A
Application number: US78777A
Authority: US
Inventors: Holman Clinton Bidwell; Egbert L Ege
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-01-02
Filing date: 1926-01-02
Publication date: 1927-10-11
Anticipated expiration: 1944-10-11

Description

Oct. 11,1927.

C. B. HOLMAN ET AL PROJEGTING APPARATUS Filed Jan. 1926 M 1 5 5. Ham-1 EyZerl' L. E'ge.

W .65 F @Zyl.

Patented Oct. 11, 1927.

UNITED STATES 1,644,781 PATENT OFFICE.

CLINTON IBIDWELL HOLMAN AND EGBERT L. EGE, OF DETROIEYMICHIGAN.

raolmcrma APPARATUS.

Application filed January 2, 1926. Serial No. 78,727.

This invention relates to projection apparatus and the'object of-the invention is to provide an apparatus for projecting a picture onto a table on which drawing paper is laid to allow the artist to make enlarged or reduced copies thereof. Another object'of the invention is to provide a projection ap-' 4 These objects and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawings in which-v 1 Fig. 1 is a section through a projection apparatus embodying my-invention.

Fig. 2 is a section taken on line 2-2 of Fi 1.

is shown in Fig. 1 a casing 1 is provided having a door 2 on one side thereof to allow access to the interior of thecasing. The door 2 ishinged to the casing by the hinges 3 and alatch 4 is provided operable by a knob 5 on the exterior to lock or unlock the door.

A pair oflenses are adjustably mounted in a barrel 6 and the barrel is mounted in the forward end of the casing as shown. One or more incandescent electric lights -7 are mounted in the forward end of the casing and are connected by means of a double wire cable 8 to a suitable source of electric current supply. Secured to the bottom of the casing and extending longitudinally thereof are two wooden strips 9 and 10'a,nd

a'member 11 is provided with a longitudinal groove 12 for the easel l las shown in Fig: 1 and by moving the member 11 to position opposite the door 2 the easel may be removed fromthe groove 12 to mount a picture thereon. The member '11 is also provided with two notches 13 fitting over. the

strips

9 and 10 so that the easel and member 11 may be moved longitudinally of the casing. An arm 15, .shown in Fig. 1 is secured to the member 11 and extends through an aperture provided therefor in the rear end of the cabinet 1. .A knob 16 the thumb tacks 18.

and the electric lights arelighted at which outwardly is mounted on the arm 15 by which the arm 15 may be moved longitudinally of the cas- 1ng thus moving the member 13 and easel 14:. The easel'14 is preferably made of soft 60 Wood so that a picture 17 or other article to be projected may be secured thereon by the thumb tacks 18. A condenser lens 27 is mounted in front of each electric lamp. 7

the face of the easel 14. A tubular member 19' is mounted on top of the casing 1 and arod 20 is slidable longitudinally therethrough, the tubular member 19 being pro- -so that the light is distributed evenly over 55 vided with set screws 21 bywhich the rod 20 may be bindingly secured at any adjustment. Pivotally mounted on the end of the rod 20 is a casing 22 in which a .rod 23is slidably mounted, the 'rod 23 bein secured in-position by the set screw 24. mirror 25 is mounted on the rod 23 and by means of the rods20 and 23 the mirror may be adjusted horizontally and may also be turned to anyposition desired onits pivot. A ven- .tilator.26 is provided in the top of the-casing so that any heat produced by the electr1c l ght may escape from the casing. ThIS device is most useful. in making enlargements or reductions'of drawings, pictures and the. like and, to operate'the device, the'door 2 is opened and the easel 14 is removed from the groove 12 at which time the picture is mounted. on the. easel by The door is then closed time by grasping the knob 16 thefeas el and picture may be positioned at the desired point within the casing at which the picture is sharply focused ,in the lens. At this time the mirror may be adjusted in position. so that the picture is-thrown onto-the'mirror by means of the lens 6 and, by moving the mirror longitudinally of the casing, the image of the picture shown on the table 27 may be enlarged or reduced, a variation in size of the image being also produced by movin theeasel 14; longitudinally of the casing. sheet of material is secured to the table top on which the picture or drawing is to be reproduced and the artist with brushes or drawing implements fills in theimage produced on the table. By this means a drawevident that the device is very simple and efficient in operation, may be easily carried about, 1s composed of few parts and 1s of consequent low manufacturing cost, and

5 provides a device which accomplishes the objects described.

Having thus fully described our invention,

I a closable opening in the side'wall thereof adjacent the rear end, a trackway in the bottom of the casing, a member grooved to ride on the trackway, said member having a transverse groove, an easel for mounting in the said transverse groove, the closable opening permitting introduction of the easel, a rod extending through the rear of the casing and attached to the said member whereby it may be moved to any position on the trackway to vary the, distance of the face of the easel from the lens, a light in the forward end of the casing for illuminating the face of the easel, a condenser lens for diffusing the light over the face of the easel, a rod slidably mounted on the casing, a mirror carried at the forward end of the rod in pivotalrelation therewith and normally extending at an angle tothe axis of the lens providing a reflector for the .purpose described. A a

2. A projecting apparatus comprising a casing of elongated substantially rectangular form, a lens at the forward end thereof, a trackway in the bottom, a member riding on the trackWay and having a groove extending in a direction transversely of the casing, said casing having a side opening, an easel insertible in the casing through the said opening and adapted to engage in the groove of the said member, a rod connected with the said member and extending to the exterior of the casing at the rear wherebythe easel may be varied in its distance from the lens, a light at the lens end of the said casing positioned to illuminate the face of the easel, a rod slidable longitudinally of the said casing on the upper side, a bearin member pivotally supported at the forwar end of the rod, a rod extending through the bearing member, a mirror carried by the last named rod, the pivotal mounting of the bearing enabling'the mirror to be set at various angles in front of the lens to receive and reflect the light rays emanating therefrom. I ,1 l

In testimony whereof, we sign this specification. J

oLIN'roN BIDWELL HOLMAN. EGBERT L,EGE. I