US2106283A - Ophthalmic mounting - Google Patents

Description

Jan. 25, 1938. E. M. SPLAINE OPHTHALMIC MOUNT'ING Filed Jan. 10, 1936 FIZZ I INVENTO R 50/490 M \S'PLAINE Patented Jan. 193 8 PATENT OFFICE 'omnmmc MOUNTING Edward M. Splaine; Southbridge, assignor tiiT'Am'crican Optical Company, Southbrldge, Miss a voluntary .association of Massachu- S th 1 Application January 10, 1936, Serial No. 5am

- In em mm 18, 1935 12 0mm; (or. 88-47) This invention relates to improvements in ophthalmic mountings and has particular reference to improved lens holding means and method of making the same.

This application is a continuation in part 0 my copending application Serial No; 344,917 filed September 21, 1934.

One of the principal objectsot the invention is to provide an improved lens holding means that will resiliently ease off the rigidity in the connection 01' the holding meansto the lens, that will insure the said holding means returning to' its initial aligned position after such easing off, that will provide means for controlling the tension of the resilient means during use, that will maintain the connection of the holding means to the lens firm and substantially rigid to prevent looseness and play during the use of the mounting and yet be oi such a nature as to relieve shocks and strain on the lenses when the'gl'asses are'dropped or roughly handled and that will eliminate the exactness and accurateness in the fitting of the parts tobe connected usually required in mounte ings of this character in the past.

Another object of the invention is to provide resilient means of the above character having a plurality of overlying sections, each of which forms a resilient backing support for the adjacent section, and each of which may be of equal or varied resiliency, as desired.

Another object is to provide novel means and method of forming the resilient means and of attaching said resilient means to the lens holding means whereby the opposite ends of the resilient means will exert forceson the lens holding means acting substantially in equilibrium about the connection of the lens holding means to the lens. Another object is to provide lens holding means of the above character so constructed that the tension of the resilient means may be varied as desired. Another object is to provide lens holding means of the above character having a relatively rigid portion and a relatively resilient lens edge engaging portion, said resilient portion being formed of a plurality of overlying sections of the same resiliency or of varied resiliencies, as desired, and

being adapted to urge the relatively rigid portion into engagement with the periphery of the lens to maintain the parts in desired aligned'relation with said lens, said rigid portion being adapted .to provide means for varying the tension of the Another object is to provide lens holding means having a part definitely shaped to produce a pleasing stream-line effect horizontally of the lens in combination with edge engaging means for resiliently maintaining the said part in desired aligned relation with the lens'in instances wherein the edge of the lens at'the location of'attachment of the holding means lies at an angle other than normal relative to the horizontal meridian of the lens and which will resiliently permit movement of the holding means both upwardly and down wardly with respect to itspoint of attachment to the lens to absorb shocks and'straindn either direction. I

Another object is to provide a relatively narrow attachment for the resilient means to the lens holding means in the direction of the edge of the lens whereby the conventional rigid backing shoes usual in prior art structures of this nature are eliminated and the normal pivotal action of the lens holding means on the lens will be greatly increased.

' Another object is to provide the backing for the resilient means on the lens holding means with relatively straight transversely extendingupper and lower edge portions whereby the said edge, portions will have a line contact with said resilient means when they are flexed.

Another object is to provide the resilient means with relatively straight transversely extending end portions whereby the said resilient means will have line contact with each other and with the lens at their respective ends.

Another object is to provide novel means functioning separately of the lens face engaging portions of the lens holding means for attaching the resilient means to said lens holding means and for preventing twisting of said resilient means sidewise relative to said; lens holding means dill ing use. I

Another object is to provide the resilient means nearest the'lens with cylindrical shaped end contacts with the edge of the lens whereby'a substantial line contact transversely of said edge will exist at different positions of flexing of the resilient means, 4

Another object is to provide novel means andmethod of making lens holding means of the above character. e

Other objects and advantages of the invention will become apparent from the following description taken in connection with the accompanying drawing, and it will be understood that many changes may be made in the arrangement I of parts, details of construction and methods shown and described without departing from the spirit of the invention as set forth in the accompanying claims. I, therefore, do not wish to be limited to the exact arrangement of parts, details of construction and methods shown and described as the preferred forms only have been shown by I way ofillustration.

Referring to the drawing: Fig. I is a fragmentary front elevation of an ophthalmic mounting embodying the invention and showing high position straps or lens holding I means;

Fig. II is a fragmentary enlarged view ofthe high position strap shown-partially in section;

Fig. III is a perspective view of a modified form of the invention;

Fig. IV is a sectional view of the lens strap shown in Fig. 111; Fig. V is a fragmentary face view of the connecting means for uniting the spring sections with "the main body portion of the lens straps shown in the various figures of the drawing;

Fig. VI is a sectional view takenon line vr---vr of Fig. v;

line IXIX of Fig. VIII.

Much difiiculty has been encountered inth past in fitting and securing the lens straps or holdingmeans of 'riml'ess type ophthalmic mountings to the lenses and in preventing the said straps or holding means becoming loose and wabbly during use, particularly when the lens straps or holding means were removed from the geometrical center line to a high position on the lens as shown in the present invention. Oneof the dimcuities has been that of maintaining the parts in proper aligned and fitted relation with each other and of fitting the parts so that when the attaching means is placed in the alignedopenings formed in the straps and lens no strain will be imparted to the lens with a danger of causing it to become broken during use. This was due primarily to the unsymmetrical nature of the contour of the lens at the high position. Means have been provided. in the past, for resiliently taking up the 'looseness and play in lens holding means of this character but such means, in most instances, provided resiliency only in one direction of movement of the lens holding means on the lens and due to the restricted size of such devices were not sufficientiy durable to produce the most desirable structure, that is, the resiliency ofthe resilient means would soon play out and permit the parts to loosen and move out of aligned relation with each other during use or when the lens holding means were properly fitted on the lens they were more or less restricted in their movement, that is, the lens holding means were not of.a free acting nature. 7

It, therefore, is one of the primary objects of this invention to provide resilient means for devices of this character which will take up the looseness or play in the connecting means to the lens, which will more or lesszpermanently maintain a shock absorbing cushion connection which will provide free acting resilient shock and strain absorbing means whose forces at its points of contact with the edge of the lens will act substantially in equilibrium on opposite sides of the means for connecting' the lens holding means to the lens.

Another object of the invention is to provide means and method of reinforcing the resilient means to produce a more permanent and durable construction and of so forming and connecting theresilient means that they will not move out of aligned relation with each other during use. I

A further object is to providea freer and wider range of flexing than has' been usual in the past in devices ofthis character.

Referring more particularly to the drawing wherein like characters of reference designate like parts throughout the several views, the improved holding means or strap I embodying the invention, as shown by one portion of Fig; I and in Fig. 11, comprises a portion, 2, which when viewed from the front is relatively straight, and has a temple connection 3 adjacent one end thereof and a bifurcated portion 4 adjacent its opposite end. The bifurcations of the portion 4 are adapted to engage with the front and rear' surfaces of the lens 5 and are provided with openings aligned with an opening in the lens a through which attaching means I, such as a screw or other suitable means known to the art;

is extended.

The lens holding means I is provided at th'e member, as shown in Fig. 11, extends outwardly of the lens holding means at one side, preferably the lower side, and is so formed that it extends transversely to the longitudinal axis of the relatively straight portion 2 and lies at an angle thereto other than normal so as to fit the angle of the upper edge of the lens at the point of attachment of the holding means.

The portion 2, at the base of the bifurcated member, is recessed, as shown at 8, to receive the sections H and I2, of the resilient lens edge engaging means 9. The resilient means 8, as shown in Figures I and II, comprises three sections II, I2, and I3 and each section is provided with an opening through which securing means ID on the base of the bifurcation extends. The

securing means is headed over to secure the said resilient than section II and the said section I2 more resilient than the shorter section H. Al-

, though I have shown and described only, three sections of varying lengths and varying degrees of resiliency, it is to be understood that the number of said sections may be varied, that is,-increased or decreased, and that thesaid sections may be made of material having substantially the same degree of resiliency if desired. The function of the resilient means 9 is'similar to that of a leaf-- spring wherein a resilient section forms a back ing support for another adjacent sectionf Atten-- tion is directed to the fact thatthe. sections III and I2, attached in the recess 8 by the connecting means ID, are held by the side walls of said recess against movement sidewise,and .are thereby preventedfrom twisting out of aligned relaTtion with each other during use.

The section l3 may also be placed in the recess 8 if desired. The inner walls of the bifurcated portion I also in some instances aid in preventing movement of the sections sidewise during use. The connecting means I which holds the lens holding means I in secured relation with the lens 5 is fitted during the assembling of the parts so as to have a predetermined amount of looseness and play to permit the said. holding means to move about the said connecting means as a center during use. This looseness and play, however, is such as to prevent movement of the lens holding means in a plane normal to the plane of 'the lens, that is, the

movement of the holding means about the pivot l in this instance is entirely in the direction of the plane of the lens. It is apparent that by adjustment of the member 6 outwardly or inwardly relativeto the peripheral edge of the lens, the tension of the resilient means 9 may be varied and the position of the lens holding means relative to the lens may be varied, that is, the longitudinal axis of the portion 2 may be varied with respect to the horizontal meridian of the lens so that the said portion may be placed in parallel or other desired relation with the horizontal meridian of the lens to produce a pleasing streamline effect transversely of said lens. The resilient means 9 provides means for taking up the looseness and play in the connection of the lens holding means to the lens and also provides free acting and durable means for absorbing shocks and strain on the lens during the use of the mounting. This arrangement obviates the necessity of having to closely associate and fit the partswith each other prior to placing the connecting means I in the aligned openings, and thereby greatly decreases the dimculties usually encountered in the past, in fitting and assembling holding means of this nature with the lenses.

The upper edge I 4 of the base of the bifurcation and the free ends of the resilient sections ll, l2 and I3 are preferably formed relatively straight transverselythereof so as to provide substantially line contact with each other and with the edge of the lens when the lens holding means is moved about the lens connecting means I. This arrangement is of particular importance when the lens holding means is attached to the lens adjacent the upper edge thereof because at this location due to the curvature of the lens, the pivotal axis of the lens connecting means is not exactly perpendicular to the edge of the lens and the plane of pivotal movement of the lens holding means on the lens and the springs, is inclined slightly to the portion of the edge of the lens against which the springs rest. This slight inclination, when the lens holding means is moved about its pivotal connection 1 to the lens has a tendency to cause the superimposed resilient sections to work about their connection to the lens holding means. If the said resilient sections are provided with line contact with each other at their ends and the edge of the bifurcated member, as set forth above, the tendency of the said resilient sections to twist about the connection to the lens holding means and of becoming loosened at said connection would be eliminated.

In Figs. V and VI .there is shown an enlarged fragmentary view of the connecting or securing means H) which extends through the aligned openings in the superimposed resilient sections ll, l2, and I3. The connecting means I0 is in the form of a rectangular pin having a reduced portion adjacent one end thereof secured by solder pin member I0 is compressed, forcing the body portion of the pin into rigid engagement with the side walls of the openings in the superimposed sections ll, 12 and I3, rigidly securing them to the body portion l6 of the lens strap and eliminating all looseness and play in the connection.

The purpose of providing a rectangular shaped pin, the greater width of which extends in the direction of the longitudinal axis of the superimposed sections, is to provide means whereby the width of the portions IS on the opposite sides of the connecting pin 10 will not be so reduced asto cause them to be weakened to a degree wherein they will notprovide a positive and permanent connection and permit the various resilient sec-.

tions to function properly. That is, the rectangular shape of the pin Ill permits forming these sections to a greater width than has been usual in the past. This also provides a longer bearing surface and thereby prevents displacement of the alignment. The portions pressed into en-- gagement with the .beveledend walls l8 provide means for anchoring the resilient means in the I direction of fiexing and thereby provide'a positive and durable attachment.

This method of attaching the resilient means I to the base of the lens holding means enables the spaced lens face engaging portions to be adjusted to any desired spaced relation with each otherindependently of the resilient means. This enables the said holding means to be fitted to lenses of varying thicknesses without danger of; having the resilient sections move out of align ment with .each other as would be the case if a round pin were used and the inner walls of the spaced face engaging portions were depended upon to hold the resilient sections in alignment. It is quite obvious that with the latter structure, if the space between the lens face engaging portions were increased, as happens when the lens holding means is fitted toa thick lens, the inner walls of said face engaging portions would move away from the side edges of the resilient means with a result that the said resilient means would twist out of alignmentduring use. ture shown in Figures -V and VI completely elimi- 'nates this difliculty.

Referring more particularly to Figures III and IV, there is shown a modified form of the invention wherein a high position strap, such as that shown in Fig. II, is so constructed as to flex downwardly as well as upwardly in the plane of the lens during use. This is accomplished by proline 23 which is substantially normal to a line tangent with the edge of the lens at the location 4 of the holding means on the lens and which ex tends substantially through the axis of the pin The struc viding the lens holding means with an upwardly 22 and point of attachment of the connecting means 24 to the lens. This provides the resilient means 2| with substantially equal edge bearing surface on the opposite sides of the point of atstantially equally on both sides of said point.

The lens holding means in this instance is provided with a temple supporting portion or arm 25 similar .to the previously described portion i6 and which lies substantially parallel with the horizontal meridian of the lensto produce a pleasing streamline effect across the lens. The resilient means in this instancecomprises three superimposed sections 26, 21 and 28 of varying lengths having relatively straight transverse end portions 29 providing substantial line contact with each other substantially throughout the full width thereof when flexed. The upwardly extending support also has a substantially straight transverse end 30 providing line contact substantially throughout the width of the adjacent resilient section when the resilient means is flexed towards said support. As previously set forth, this line contact provides wide bearing surface withthe rear of the respective resilient sections and prevents their twisting sidewise on the pin member 22 and moving out of aligned stacked relation with each other during use. It will benoted that thepin 22is offset to one side of the longitudinal axis 3i of the temple support and .the center of the connecting means 24'is offset to the other side of the longitudinal axis 3|. The support 20 has an attaching face 32 lying at an angle to the longitudinal axis 3| and substantially tangent to but removed from the edge of the lens. The feature of this construction resides in the fact that the resilient means 2! contacts the edge of'the lens at two means 24 when the supporting arm is in its normal horizontal position. The face 32 is cut away at 33 to provide clearance whereby the lower resilient portions will be free to flex rearwardly throughout the major portion of their lengths during use.

It will be noted that the distances between the ends 29 of the various resilient sections and from the edge to the end 29 of the section 26 are substantially the same. This is to provide staggered line contact supporting ends or edges at equally spaced intervals intermediate the ends of the resilient section 28 which during the flexing of said section will be successively brought into action to stabilize the flexing of said section throughout its length. The sections 26 and. 21

resiliently ease off the flexing of the section 28 and increase its tendency to return to its initial set after such easing off. This function takes place in either direction of flexing about the pivot 24.

In Fig. VII there is shown another modified form of high position strap similar to that shown in Fig. III, only in this instance instead of extending all of the superimposed spring sections both upwardly and downwardly similar amounts on opposite sides of the attaching means 34, the sections 35 and 36 extend upwardly only of the point of attachment 34. In this instance the normally relatively short resilient backing member or section 31 is provided with an elongated downwardly extending spring portion 38 forming the lower lens edge engaging means.- The spring portion 36 is preferably of a .tension substantially equal to the combined tension of the sec- 2.106.383 tachment 24 so that when the lens holding means tions 35 and 36 so as to substantially.eq lalize-the.

lens edge engaging 'pressur on thecppqsite sides-- i-ihale s tran of the point of attachmen to the lens. 1 Attention is directed to the factthat inrthis instance the attaching means.34..forsecuringthe various sections '35, .36 and 3"! to. vthe lens holding. means is not positioned oma line substantially normal to a line gangent with thesedge the lens'at the locatio .of the holding K168115391} .the lens, and which extends. substantially through the axis of the point of attachment of the .c A

necting means 39tothe lens, but the, related sitions, resiliency and dimensions of the super:

imposed sectionsl35; 36 and 31 are such as to provide substantially equal resiliency. on the op; posite sides of the point ofattachment 39. The alignment of the holding means on the lens may be varied by the proper adjustment of the spring section 38. If desired, however, the point of attachment 34 could be positioned on a line normal to a line tangent with the edge of the lens and extending through the point of attachment 39 if desired. This could be accomplished by increasing the lowering of the point of attachment 39. relative to the longitudinal axis of the temple support 40 the-proper amount.

The spring sections 35 and 36 may be of equal resilience or may be varied in resilience. as desired, that is, the section 36 may be made more rigid than the section 35 in a manner similar to that shown and described in connection with the above figures of the. drawing. or the sections may be of material having the same resiliency formed to diiferent lengths to render them different in resilient reaction. This is due to different lever actions which cause the spring sections to react differently, the shorter sections being more rigid in their action than the' longer sections, etc.

Attention is directed to the fact that there is a clearance provided in the rear of the lower resilient means as indicated at 4|, to provide means whereby the lower portion may be free to flex towards oraway from the edge of the lens.

It will be noted that the ends 42 of the spring section 35 are flattened or shaped to have substantially intimate contact with the edge of the lens throughout the length of said end portions substantially as shown. This is for the purpose of distributing the pressure of the ends of the spring on the lens throughout an increased area rather than have it concentrated on single spots when the lens holding means is moved on its pivot connection with the lens. This producesa surface contact between the'edge of the lens and ends of the spring and greatly relieves the strain which might'be introduced at these locations.

In Fig. VIII there is shown another modified form of the invention wherein the ends 43 of the spring 44 are curved to provide substantially cylindrical shaped contact surfaces with the edge of the lens. This provides curved engaging sur-,

. faces instead of relatively sharp contacting edges the opposite sides of the attaching pin 50 to provide more clearance for the flexing of the spring sections rearwardly during use. In this instance j the ends of the pin 50, corresponding to the ends I! in Fig. VI, into engagement with the spring section 44 to secure them to the support 48; If

the spring section 46 is not cupped, as stated above, the various spring sections have a tendency to straighten when the ends of the pin 50 are pressed rearwardly to secure the said spring sections to the support. This cupping therefore provides sufficient resistance during the assembling operation to prevent this straightening of the spring and yet provides a resilient backing for the section 85 during use.

In the structure shown in Fig. IV, the face 32 of the support 20 is cupped or curved to the approximate curvature of the spring sections 26, 21 and 28 and thereby obviates any tendency of the said sections to straighten when the projections on the pin member 22, corresponding to the projections I] of Fig. VI, are forced into engagement with the section 28 to attach and hold the various sections in aligned relation with each other on the support 20. The face 32, as well as all of the corresponding attaching faces of the various constructions shown in the drawing, is relatively narrow inthe direction of the edge of the lens and is so positioned relative to the edge of the lens that the normal pivotal movement of the lens holding means on the lens is greatly increased and the flexing action of the resilient means is also greatly increased. This arrangement, therefore, greatly increases the shock and strain absorbing characteristics of lens holding means of this nature.

It is to be understood that either of the above methods of preventing straightening of the resilient sections during the securing thereof to their supporting means may be used in any of the constructions shown. Inthe construction shown stantially straight transversely of the resilient means will have a tendency to cause the various sections to cup rather than to straighten.

Although the connecting pin shown in- Figures V and V1 is described as being used in connection 'with the lens holding means, illustrated in Fig.

11, it may be applied to any of the structures disclosed herein.

In all of the above described structures it is apparent that resilient means incorporating a plurality of sections forming resilient backing supports for each other and which may be regu-' lated as to their tension by controlling their lengths and thicknesses have been provided. This type of resilient means overcomes most of a the difficulties encountered in prior art lens hold- 'ing devices of this nature in that it is more durable and maintains a snug and permanently resilient connection'with the lens during use. In all instances the conventional rigid backing supports or edge strap portions of the prior art struc-' tures have been eliminated and have been replaced by the resilient backing members. This provides a wider range of flexing and morepractical and balanced means for absorbing strains and shocks in directions both upwardly and" downwardly relative to the plane of the lenses.

From the foregoing description it will be seen that I have provided simple, emcient and economical means and methods of obtaining all of the objects and advantages of the invention.

Having described my invention, I claim: 1. A device of the character described for attachment to'a lens at a point removed from the horizontal geometrical center line of the lens, said attachment having a supporting arm the longitudinal axis of which is adapted to be main tained in a substantially horizontal plane when in its position of normal use on the lens and a lens engaging element adapted to be connected to the lens at a point removed to one side of the longitudinal axisof the supporting arm, a portion adjacent one of the ends of the supporting arm adapted to overlie the edgeof the lens and formed with a relatively short attaching face for resilient means, said attaching face lying at an angle other than normal relative to the-longitudinal axis of said supporting arm," and resilient means secured intermediate the ends thereof to said attaching facefor contacting the edge of the lens at two spaced points, one on each side of the point of attachment of said resilient meanswith said attaching face and on opposite sides of the longitudinalaxis of the supporting of the resilient means on the opposite sides of the point of attachment will exert forces on said supporting arm acting substantially in equilibrlum about the connection to the lens when the supporting arm is in its normal horizontal position.

2. In a device of the character described for attachment to a lens at a point removed from the horizontal geometrical center line of the lens, saidattachme'nt having a supporting arm the longitudinal axis of which is adapted to be maintained in a substantially horizontal plane when it is in its position of normal use and a lens engaging element adapted to be pivotally' connected to the lens at a point removed to one side of the longitudinal axis of the supporting arm, an oflset portion extending from adjacent one end of said arm on one side only and at an angle other than normal relative to the longitudinal axis of the arm and having a face adapted to lie substantially parallel with a line tangent with the edge of the lens at said location when said arm is in a horizontal position of use and resilient means for contacting the edge of said lens at two spaced points and connected ;to the face of said offset portion at a point removed from the longitudinal axis and atsuch a location as to exert forces on said supporting arm acting substantially in equilibrium about the pivotal connection-to the lens, said. face being cut away adjacent the lower portion thereof to lie in a plane further removed from the edge of the lens to provide clearance silient means during use.

3. A device of the character described for attachment to a lens at a po nt removed from the horizontal geometrical center line of the lens, said attachment having a supporting arm the iongitudinal axis of which is adapted to be maintained in a substantially horizontal plane when in its positionof normal use on the lens and a arm lying at an angleother than normal relative to the longitudinal axis of the supporting arm and adapted to overlie the edge of the lens and provide an attaching face for resilient means and a plurality of superimposed resilient members of varying lengths secured to said attaching face by a single attaching member with at least oneof said resilient members adapted to contact the edge of the lens at two spaced points on opposite sides of the point of attachment ofsaid resilient means with said attaching face and on the opposite sides of the longitudinal axis of the supporting arm, said point of attachment lying on aline substantially normal to the plane of the attaching face and at an acute angle to the longitudinal axis of said supporting arm and extending through the point of connection of the lens engaging element to the lens, whereby the portions of said resilient means on the opposite sides of said point of attachment will exert forces on said supporting arm acting substantially in equilibrium about the connection to the lens when the supporting arm is in its normal horizontal position.

4. A device of the character described for attachment to a lens comprising a member having an attaching portion for engaging the face of the lens and means for overlying the edge of the lens and extending outwardly of the opposite sides of said member for engaging the face of the lens, one of said means extending outwardly of the opposite sides of said face engaging member comprising a plurality of superimposed resilient members and. the other a single resilient member, said single resilient member being formed to a resiliency substantially equivalent to the combined resiliency of the plurality of resilient members.

5. A device of the character described for attachment to a lens at a point removed from the horizontal geometrical center line of the lens, said lying above a horizontal line extending through tively short in a direction? following'the edge 01' the pivotal connection to the lens, said edge portion having an attaching face on the side thereof adapted to lie toward the lens which is relarelative to the horizontal center line of the lens when the attachment is on the lens, and resilient means secured to said face and havingv portions adapted to extend outwardly of the opposite sides ofthe said horizontal line extending through the pivotal connection to the lens and being adapted to engage the edge of the lens at two spaced I 2,106,888 for the flexing of the lower portion of the repoints substantially equidistant from a line extending through the point of attachment of the resilient means to said face and the pivotal connection to the-lens to exert forces on said portion overlying the edge of the lens acting sub-' stantially in equilibrium about the connection to the lens when the parts are in their normal position of use.

6. A device of the character described for attachment to a lens at a point removed from the horizontal geometrical center line of the lens, said attachment having asupporting arm the longitudinal axis of which is adapted to, be maintained in a substantially horizontal plane when r in its position of normal use on the lens and a lens engaging element adapted to be pivotally connected to the lens at a point below the longitudinal axis of the supporting arm, a portion adjacent one of the ends of the supportingzarm adapted to overlie the edge of the lens and resilient means having a' portion attached to said resilient means on the opposite sides of said point of engagement being balanced to exert forces onsaid supporting arm acting substantially in equilibrium about the pivotal connection to the lens when the supporting arm is in its normal position'of use.

'7. A device of the character described for attachment to a lens ata point removed from the horizontal geometrical center line of the lens,

said attachment having a portion adapted to overlie a face of the lens and be pivotally connected to said lens and a portion adapted to overlie the edge of the lens with the major .portion thereof lying above a horizontal line extending through the pivotal connection to the lens, said edge portion having an attaching face on the side thereof adapted to lie towards the lens which is'relatively short in a direction which is to follow the edge of the lens and which lies at'an angle other than normal relative to the horizontal center line of the lens when the attachment is on said lens, and resilient means secured to said face and having portions adapted to extend outwardly of the opposite sides of said horizontal line extending through the pivotal connection to the lens and being adapted to engage the edge of the lens at two spaced points and beingsupported so as to exert forces on said portion overlying the edge of the lens in both directions of movement of said portion about the pivotal connection to the lens when the parts are in their normal position of use. V

8'. A device of the character described for attachment to a lens at 'a point removed from the horizontal geometrical center line of the lens, said attachment having a portion adapted to overlie a face of the lens and be pivotally connected to said lensand a portion adapted to overlie the edge of the lens with the major portion thereof lying above a horizontal line extending through the pivotal connection to the lens, saidedge portion having an attaching face on the side thereof adapted to lie towards the lenswhich is relatively short and cupped in the direction which is to follow the edge of the lens, and which lies at an 2,106,988 angle other than normal relative to the horizontal center line of the lens when the attachment is on said lens and resilient means secured to said cupped face so as to have the portion thereof engaging said face assumethe shape thereof and edge of the lens in both directions of movementof said portion about the pivotal connection to the lens when the parts are in their normal position of use.

9. In an ophthalmic mounting, a lens, a lens holding member having a portion overlying a face of the lens and pivotally connected to said lens at a point removed from the horizontal geometrical center line of the lens and a portion overlying the edge of the lens with the major portion thereof lying above a horizontal line extending through the pivotal connection to the lens, said edge portion having an attaching face on the side thereof adjacent the lens which is relatively short in a direction following the edge of the lens and which lies at an angle other than normal 'relative to the horizontal center line of the lens when the parts are in their normal position of use, and resilient means secured to said face and having portions extending outwardly of the opposite sides of said horizontal line extending through the pivotal connection to the lens and engaging the edge of the lens at two spaced points and being supported so as to exert forces on said portion overlying the edge of the lens in both directions of movement of said portion about the connection to the lens when the parts are in their normal position of use.

10. In an ophthalmic mounting, a lens, a lens holding member having a portion overlying a face of the lens and pivotally connected to said lens at a point removed from the horizontal geometrical center line of the lens and a portion overlying the edge of the lens with the major portion thereof lying above a horizontal line extending through the pivotal connection to the lens, said edge portion having an attaching face on the side thereof adjacent the lens which is relatively short and cupped in the direction following the edge of the lens and which lies at an angle other than normal relative to the horizontal center line of the lens when the parts are in their normal position of use, and resilient means secured to said cupped face with said resilient means substantially assuming the shape of said face and with portions thereof extending outwardly of the opposite sides of the said horizontal line extending through the pivotal connection to the lens and engaging the edge of the lens at two spaced points and being supported so as to exert forces on said portion overlying the edge of the lens in both directions of movement about the'pivotal connection to the lens when the parts are in their normal position of use.

11. A device of the character described for attachment to a lens at a point removed from the horizontal geometrical center line of the lens, said attachment having a portion adapted to overlie a face of the lens and be pivotally connected to said lens and a portion adapted .to overlie the edge of the lens and having a, projection on the upper side thereof when the attachment is in its normal position of use, said edge; portion and projection having an attaching face on the side thereof adapted to lie towards the; len "which is relatively shortrin a direction which to follow the edge of the lens and which liesatiw'an angle other than normal relative to the horizontal="center line of the lens when the attachment is on said lens andwhich is formed irregular to provide a portion acting as a support for the attachment of resilient means and a portion forming a clearance for the resilient means on the side of said portion adapted to overlie the edge of the lens opposite the projection for free flexing of the adjacent portion of said resilient means during use and resilient means secured to said support at a point above a horizontal line extending through the pivotal connection to the lens and having portions adapted to extend outwardly of the opposite sides of said horizontal line and being adapted to engage the edge of the lens at two spaced points and being supported so as to exert forces on said portion overlying the edge of the lens in both directions of movement of said portion about the pivotal connection to the lens when the parts are in their normal position of use.

12. In an ophthalmic mounting, a lens, a lens holding member secured/to the lens at a point removed'from the horizontal geometrical center line of the lens, said lens holding member having a portion overlying a face of the lens and pivotally connected to said lens and a portion overlying the edge of the lens and having a pro-- jection on the upper side thereof when the lens holding member is in its normal position of use, said edgeportion and projection having an attaching face on the side thereof lying towards" the lens which is relatively short in a direction following the edge of the'lens and whichlies at an angle otherthan normal relative to thehorizontal center line of the lens and which is formed irregularto provide a portion acting as a support for the attachment of resilient means and a portion forming a clearance for the resilient means on the side of said portion overlying the edge of the lens opposite the projection for free flexing of the adjacent portion of said resilient means during use and resilient means secured tosaid support at a point above a horizontal line extending through the pivotal connection to the lens and having portions extending outwardly of the opposite sides of said horizontal line and engag-.

EDWARD M. SPLAINE.

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