US2622474A - Portable vision testing device - Google Patents

Description

Dec. 23, 1952 c. w. KEITH 2,622,474

PORTABLE VISION TESTING DEVICE Filed Jan. 9, 1952 2 SHEETS-SHEET 1 Fig.4

'9 Hi, m 3 27/ m Claymkeifh 20 BY -MW Dec. 23, 1952 c. w. KEITH PORTABLE VISION TESTING DEVICE 2 SHEETS-SHEET 2 Filed Jan. 9, 1952 M e K W. m a

m h V o I. w my m Patented Dec. 23, 1952 UNITED STATES P EFEC 1 Claim.

The present invention relates to new and useful improvements in devices for testing the vision of applicants for motor vehicle driving permits and for otherwise conducting visual tests and more particularly to a portable cabinet for this purpose.

An important object of the invention is to provide a cabinet having removable alphabet or reading charts as Well as color testing disks all illuminated by lamps in the cabinet to thus provide an intelligence test and a color blind test in a single vision testing device.

Another object is to provide a cabinet constructed in the form of a carrying case and having a removable top to afford access to the interior of the cabinet for changing the charts and providing the underside of the top with a cord holder on which an extension cord for the lamps may be coiled.

A still further object is to provide a device of this character of simple and practical construction, which is neat and attractive in appearance, relatively inexpensive to manufacture and otherwise well adapted for the purpose for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view;

Figure 2 is a vertical sectional view taken on a line 2-2 of Figure 3;

Figure 3 is a vertical transverse sectional view taken on a line 3-3 of Figure 2;

Figure 4 is a horizontal sectional view taken on a line l4 of Figure 2; and

Figure 5 is a diagram of the electric circuit for the lamps.

Referring now to the drawings in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of my invention, the numeral 5 designates a case of light weight metal, wood or other suitable material and of rectangular shape and provided with a carrying handle 6 at one side.

When placed in use the case rests on one end in an upstanding position and the opposite or upper end of the case is provided with a removable cover 1 also having a handle 8 and secured on the top of the case by conventional type of cabinet fasteners 9. A flat cord holder it is secured edgewise to the underside of cover I for winding an extension cord H thereon.

The cord ll includes a plug 12 adapted to plug into an electric socket I3 at one side of the case, when the cord is removed from the holder ID to connect a plurality of lamps M mounted on the inside of the case with a suitable source of current. The circuit for the lamps is provided with a switch 16 mounted in one side of the case and preferably of the push button type.

The front and rear walls ii and I8 of the case are open and over which are placed charts I9 and 29 each comprising a translucent panel 2! having indicia 22 painted or otherwise displayed thereon and which may comprise signs 23 formed of words 26, or letters of the alphabet 25, or direction arrows 2t suitable for testing the knowledge of a person of trafiic signs and signals. The panels 2! are removably held in guide strips 21 on the inside of the front and rear walls.

The front wall of the case beneath the chart i9 is provided with a horizontal row of openings 28 in which are placed amber, red and green lenses 29, 30 and 3| to test color blindness.

By plugging in the cord II the lamps M may be energized to illuminate the charts l9 and 20 as well as the color disks 29, 3t and 3| to thus provide a vision test suitable particularly for conducting tests of applicants for driving licenses.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claim.

Having described my invention, what claimed as new is:

A portable vision testing target device for testing the ability of persons to perceive various traffic signals, said target device comprising a substantially rectangular case having an upper removable end wall and means releasably securing the end wall thereto, said case including forward and rear vertically disposed walls each having a substantially rectangular opening therein, each of said openings having a pair of vertical edges, a pair of angle guide and retainer strips secured to the inner face of each forward and rear wall alongside of said vertical edges, translucent indicia bearing charts having vertical side having three horizontally spaced apertures be- 10 low the opening in said forward wall, and red, green and amber color blindness testing lenses secured to said forward wall in registry with the apertures, whereby a persons ability to learn traffic signals and distinguish said various colors 15 may be determined.

CLAY W. KEITH.

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

UNITED STATES PATEN' IS Number Name Date 1,318,377 Grazier Oct. 14, 1919 1,353,372 Woodhull Sept. 21, 1920 1,874,986 Harker Aug. 30, 1932 FOREIGN PATENTS Number Country Date 403,661 Great Britain Dec. 27, 1933

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