US817046A - Oculometroscope. - Google Patents

Description

PATENTED APB.. 3, 1906..

H. I. GOWAN a B. ABEL.

OGULOMETROSGOPE.

APPLIUATION FILED SEPT. a1, 1905.

No. 817,046. lIA'IENTED APR. 3, 1906. H. I. GO'WAN n B. ABEL.

ULOMETRDSGOPE.

APPLIUATION FILED SEPT. 21, 1905.

2 SHEETS-SHEET Z.

Snom/wow VIO `invented clare'the following to be a full, clear, and ex- -act description of the invention, such as will :pertains to Vmake and use the same.

'11 being flattened and attached by rivets 12 UNITED STATESk PATEN T OFFICE.

HARRY I. COWAN AND BERNARD ABEL, OF VVOBURN, MASSACHUSETTS. OCULOWIETFIOSCOPE.

Specification of Letters Patent. Application filed September 21, 1905. Serial No. 279,431.

iNo. 817,046. fatentecl April 3, 19.06.

ToaZZ whom :it may concern:

.Beit known that we, HARRY I. CowAN and BERNARD ABEL, citizens of the United l States, `residing at l/Voburn, in thecounty of Middlesex and State of Massachusetts, have certain new and useful Improvements `in Oculometroscopes; and we do de- Secured-to the standard 7 at a pointiinihori- Zontal line with the `pivots 13 are plates 17 17, one of said plates being arranged :at ithe front and the other at'the backfofthestandard and secured in place by the rivets 18and the lens-disks 14 being free to rotate between said plates. On the front plate 17 is ahood 19, provided with side blinders 20, `of the usual construction, having a colored-glass lens to modify light. On the plate 1.7 .are arranged two apertured disks21, each having a white line a extending `from .its periphery to its central aperture 22. Thedisks 21 are mounted to be rotatably adjusted in semicircular bearings 23, having each .an indicating scale 24 thereon. A blind 25 is provided for each disk 21. These blinds are :pivotcd to the plate 17 and `are adaptedto swing into line with the apertures 22 or outof the way, as will be understood.

To hold the lens-disks 14 in adjusted positions with the axis of each lens central to the apertures 22, a spring-detent 26 is mounted in each arm 9 and adapted to encrage one of a series of notches 27 in the periplieries of the disks 14. These detents )ermit the disks to be freely rotated and click in the notches to indicate the axial points in the lenses.

A chin-rest 28 is secured to a bracket 29, the vertical member of which is passed through an opening in the portion 4 of the base, and is pivotally connected at its lower end to a lever 30, pivoted at 31 to the basel and having a ilattened rear end adapted to be engaged by a hand-screw 32 for adjusting the chin-rest vertically to suit different patients.

An electric light and chimney 33, of any suitable character, is mounted upon the upper end of a tube 34, and said tube is vertically adjustable in a bracket 35 by means of a set-screw 36, the opposite end of said bracket being fitted to slide vertically and swing laterally upon the'standard 7, so that said light may be adjusted from one side to the other or centrally to the disks 21. A setscrew 37 secures the bracket in adjusted position on the standard 7. The electric light shown in the drawings is of the incandescent type and is adapted to be connected to the usual fixtures by conventional means.

A graduated rod 3S is adjustably mounted upon a tubular support 39, rising from the base 1, and a printed card 40 is connected to a clip 41, iitted to slide upon the rod 38 to test the near vision of the patient.

The operation of our invention will be unenable others skilled in the art to which it ap- This invention relates to oculometroscopes, and one of the principal objects of the same is to provide an instrument for accurately and quickly locating the axis of astigmatism and for indicating the required lens for correcting the vision.

Another object of theinvention is to provide an instrument which is adapted for both objective and subjective examination of the eye and in which the near point of the eye can be accurately and readily found.

Still another object is to provide means for obtaining a perfect visional image without requiring a dark room in which to operate.

These and. other objects are attained by means of the construction illustrated in the accompanying drawings, in which- Figure 1 is a front elevation of an instru.- l ment made in accordance with our invention. Fig. 2 is a rear elevation of the same. Fig. 3 is a side elevation of the same, and Fig. 4 is a detail section of one of the spring-detents for holding the lens-disks in place.

Referring to the drawings for a more particular description of the invention, the numeral 1 designates a base or stand for supporting the instrument and consisting of the two front legs 2 2, the rear leg 3, the elevated front support 4, and the depressed rear support 5. A tubular socket 6 is secured in an upright position to the support 4 of the base 1, and tted in said socket 1s a vertically-disposed standard 7, the lower end of which is held in adjusted position in the socket 6 by means of a binding-screw 8. Tubular arms 9, bentcentrally at 10, are secured at their terminal ends 11 to the standard 7, said ends Secured to each arm 9 at 0 is a pivot-pin 13, and mounted to rotate upon each pin 13 is a lensdisk 14, each disk having a series of progressivelyarranved lenses 15 secured near the peripheral ec ge thereof, and each lens having its number indicated on the rear side of the disk, as at 16.

to the standard 7. the bent portion 1 IOO IIO

able standard rising therefrom, arms on the bearings rovided with indicating-marks, an adjustab e chin-rest ongone side of the lensdisks, and an adjustable light upon the opposite side thereof, substantially as described.

2. In an instrument of the character described, the combination of a base, an adjustable standard rising therefrom, outwardlybent arms connected to said standard, lensdisks mounted. to revolve on said arms', plates secured to the standard, one on each side of the disk, a sight-hood secured to one of said plates, a pair of apertured disks mounted to revolve in bearings on vthe other plate and provided with lines extending across said disk, said bearings provided with indicatingmarks, a chin-rest vertically adjustable toward and from the sight-hood, and a light located upon the opposite side of the lensdisk, substantially as described.

In testimony whereof we have hereunto set our hands in presence of two subscribing witthe disks 21 the white lines a may be adjusted to accurately coincide with the band of light in the eye, and the indicating-marks on the bearings 23 will designate the exact axis of the cylindrical lens required to correct the astigmatism. The face and eyes being withl in the hood 19 perfect darkness is attained, and the adjustments and tests may be quickly carried on with accuracy and precision.

Various changes in the form, proportion, l 1

derstood from the foregoing; By adjusting k and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described our invention,what we claim as new, and desire to secure by Letters Patent, is-

l. In an instrument of the character described, the combination of a base, an adjuststandard, lens-disks mounted to revolve on nesses.

the arms, plates secured to the standard, one HARRT I. COWAN. on each side of the disks, a sight-hood sej BERNARD ABEL. cured to one of said plates, a pair of aperl. Witnesses:

tured disks provided with lines and mounte j A. D. PEGKHAM,

to revolve in bearings onthe other plate, said i W. R. LONG.

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