US1474788A - Trial frame - Google Patents

Description

Nov. 20, 1923. BAA-"$4,788

H. K. PARSONS TRIAL FRAME Filed July 29, 1919 v nnmi INVENTOR Hm PARSOHS lllll l illl llllllll! BY W m a 25275 I ATTORNEYS Fate-rated Nov. 233?, I923.

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HAROLD K. PARSONS, OF SOUTHBB-IDGE, MASSACHUSETTS, ASSIGNOR TO AMERIGAN orrrcnf COMPANY, or soUrHBarn rron or MASSACHUSETTS.

E, MASSACHUSETTS, A. VOLUNTARY ASSOCIA- TRIAL FRAME.

Application filed July 29,

To aZZ whom it may concern.

Be it known that I, HAROLD K. PARsoNs, of Southbridge, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Trial Frames, of which the following is a specification.

This invention relates to improvements in trial frames, and has for its principal object the provision of a novel and improved construction of trial frame in which the lens retaining cells may be independently adjusted to conform to the exact position of the eyes of the wearer.

A further object of the, present invention is the provision of a trial frame of this character in which the parts may be readily adjusted but in which they will be rigidly held when in adjusted position.

it further object of the invention resides in the provision of novel and improved means whereby the several adjustments may be effected.

Other objects and advantages of my improved construction should be readily ap parent by reference to the following specification takenin connection with the accompanying drawings, audit will be under stood that I may make any modifications in thespecific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure I represents a front elevation of one form of my frame.

Figure II represents a top plan view thereof.

Figure III represents a detail sectional view taken as on the line III-III of Figure I.

Figure IV represents a front view of a slightly modified form of my invention.

Figure V represents a front view of a center control shifting mechanism therefor.

Figure VI is a perspective view of a portion of the frame and shifting mechanism therefor.

Figure VII represents a view partially in section further illustrating the adjustment mechanism. 7

In the. drawings, the numeral 1 designates the bridge center for my frame, which is shown as having swiveled thereto a suitable crest pad 2 adapted to rest on the bridge of 1919. Serial No. 314,054.

the nose of the patient. In the form of the invention illustrated in Figure I, for example, I have shown as secured to each end of the bridging member 1 an arcuate frame member 3 having vertical portions 4 projecting above the bridge and corresponding upward extensions 5 at its outer sides extending upward above the end pieces 6 for the temple or other head engaging members 7 which serve to retain the frame in position on the face. Slidably mounted upon the projections or arms 4- and 5, are the guide blocks 8 illustrated in section in Figure III, having the recesses 9 for the friction spring 10 and the guide ways 11 for the arms 12 of the lens cell 13 which may be adapted to hold one, two or more lenses, as desired, being shown in Figure II as provided with a pair of lens receiving grooves.

The operation of this form of my inven tion should be readily apparent by reference to Figure III, from which it will be seen the spring 10 bears at the one side against the upright 5 and its termini bear against the arm 12 forcing the arm 12 against the front portion of the slide block 8 and the arm 5 against the rear portion of the slide block. In this way a sufiicient friction is produced on the several parts to allow them to he slipped back and forth for adjustment purposes but retain them against accidental sliding movement; To facilitate the transverse adjustment of the lens cell 13, I preferably provide the outer cell arm 12 with a knob or handle portion 14.

In Figure IV, I have hown a slight modification of my invention, in which I supplement the action of the spring 10 by the set screw 15, which serves to lock the slide block against accidental vertical movement on its arm after it has been properly adjusted without interfering with the lateral adjustment of the frame which may be freely moved across to retain the exact correct pupillary distance. In this connection it will be noted that as illustrated in Figure IV for example, the arm 12 may be provided with suitable graduations as at 16 to indicate the lateral adjustment of the cell with respect to the center of the frame, the pupillary distance of the complete mounting thus being the sum of the two adjustments indicated at opposite sides.

In Figures V, VI and VII, I have illustrated a different method of adjustment of the lens cells, in which in place of asliding movement the various adjustments are accomplished through gear or similar mechanism. Inthis form the uprights d and 5 are provided with rack portions 17 with which mesh the pinions 18 carried by the shaft 19, which is centrally journaled in the block 20 whichcarries the lens cell 13. This shaft has the central portion provided with a series of circumferential grooves 21 providing a rack, while extending transversely of the block 20 at right angles to the shaft 19 is the operating shaft or spindle 22, been ing on its front end the operating head 23 and provided with the gear 2% adapted to mesh with the pinion 25 keyed on the shaft 19 and rotatably mounted on the side of the block 20. This shaft 22 is further provided with the pinion 26 adapted to be selectively meshed with the rack portion 21 of the shaft 19, the Shaft 22 being capable'of sliding movement in the block so that the rack 21 and pinion 2601' the gear 2% and pinion may be selectively engaged asdcsired, the, rotation of the gear 2 1: and pinion serving to rotate the shaft '19 and thus through the engagement of its pinions 18 with the racks 17 of the uprights and 5 to raise and lower the lens cell, while engagement of the pinion 26 and shaft rack 21 serve to laterally shift the block and associated parts for pupillary adjustment it will be noted that to properly guide the lens cell 1 use the slide blocks 8 which may or may not be provided with the spring arms as illustrated in Figure III. In the event the spring 10 is not used, any suitable meansmay be em ployed to prevent dropping of the lens cell when adjusted, a suitable device for this purpose being the spring ratchet or fric I tion brake member 27 secured to the side of the block 20 and engaging the teeth of the pinion '25.

From the foregoing description taken in connection with the accompanying drawings, the construction of my improved trial frame should be readily understood and it will be seen that I have provided a novel and advantageous frame in which the lens cells shall be independently relatively adjustable'in and out and up and down to take care of the exact facial requirements of the wearer, and in which novel and improved means are provided for effecting and maintaining the said severa adjustments. 7

I claim:

1. A trial frame including a pair of up.- rights for each eye, a lens cell. and means on the uprights supporting the lens cell for vertical and lateral adjustment.

2. A trial frame including a pair of uprights for each-eye, a lens cell, means on the u ari hts suoporting the lens cell for verl e l tical and lateral adjustment, and means'for the combination with a pair of uprights provided with racks, of a lens cell carrier having portions interlocking with both" of the racks, including a pair of pinions, and

means for synchronously operating the pinions to raise and lower the carrier.

5. ln a device of the character described, the combination with a pair of uprights rovided with racks, of a lens cell carrier aving portions interlocking with both of the racks, including a pair of pinions, means for synchronously operating the pinions to raise and lower the carrier, and a lens cell mounted on the carrier.

6. An eye testing instrument including a bridging member, a frame connected thereto, including a pair of racks at each side of the bridging member, operating means associated with each of-said pair of racks comprising a transverse shaft having a pair of pinions meshing with each pair of racks, a transverse rack member, a center block, a lens cell mounted on the center block, and means on the center block for selectively operating the transverse rack or the pinions to laterally or vertically shift the lens cell. 7. In a device of the character described, a lens cell, a block'carried thereby; shift pinionsfor the lens cell associated with" the block, a gear for sin'iultaneously rotating said pinions, a transverse rack associated with the block, and an operating shaft having a pinion for engagingfthe rack and a gear for engaging the pinion oper ting gear, said shaft being slidable to'sele'ctively bring its pinion or its gear into operation as desired. v S. In an eye testing instrument, the combination with a pair of uprights for, each eye of the wearer, of a lens cell vertically and laterally slidable with respect tosaid uprights, and friction meansfor locking the cell in desired adjusted position.- 9. In an instrument of the character described, the combination with a pair of upright members for each eye, of a lens cell having arms slidably engaged on the pair of uprights, means for vertically shifting the arms with respect to the uprights. and for locking the cell in adjusted position." lntestimony whereof I have affixed my signature in presence of two witnesses.

HAROLD K. PARSONEJ. Witnesses: H. E. COLEMAN,

Esrrrnn M. LAFLER.

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