USRE20732E - Adjustable bridge for bifocal lenses - Google Patents

Description

y 1938. A. o. YOE

ADJUSTABLE BRIDGE FOR BIF'OCAL LENSES Original Filed Feb. 1, 1935 2 Sheets-Sheet 1' May 17, 1938. A. O. YOE

ADJUSTABLE BRIDGE FOR BIFOCAL LENSES Original Filed Feb. 1, 1935 2 Sheets-Sheet 2 3114A" n10 42% am 0 Ike,

wa if Zi t f/ Reissued May 17, 1938 UNITED STATES PATENT OFFICE ADJUSTABLE BRIDGE FOR BIFOCAL LENSES Alphas 0. Yea,

'lailadeg Ala George P. Kimmei, Brookeviiie, Ind.

a. "dumb 18 Claims.

This invention relates to spectacles or eyeglasses, and particularly to an adjustable nose bridge for use with bifocal lenses.

Bifocal lenses such as are used in spectacles and eyeglasses were originally made by cementing into the lower portion of the rims a lens having a different focal length from the upper portion. More recently it has become the general practice to form both lenses from a. single piece of optical 1 glass and to grind the lower portion thereof so that it has a diflerent focal length from the upper portion of the lens. Such lenses present a more sightly appearance, as the line where the separate lenses of different loci were cemented together is eliminated.

Bifocal lenses as now commonly made have the lens of shortest focus, generally termed the reading lens, at the bottom, and the lens 0! longest focus, or the distance lens, at the top. As the distance lens is the one normally used and the reading lens is used only when one is reading, it is the usual practice to make the distance lens of a larger area than the reading lens and when the glasses are worn it lies opposite the lens of the 2.1 eye and imparts no additional strain on the eye due to its position with respect to the lens of the eye. However, the reading lens lies below the level of the lens of the eye, which necessitates that the wearer, when reading, look downward, so

that the angle of vision is not normal and additional strain is placed upon the eye.

It has heretofore been proposed to overcome the above objection to the use of bifocal lenses by providing a nose bridge which might be shifted :is in either of two positions, so as to bring either the reading lens or the distance lens opposite the lens of the eye of the wearer, so that no additional strain is placed upon the eyes, regardless of which lens is being used. Such proposals, while satisfactory from the standpoint of eliminating additional eye strain due to an abnormal angle of vision have been objectionable in that it has been necessary to remove the eyeglasses or spectacles from the face in order to adjust the bridge to bring the other lens opposite the lens of the eye.

With the above and other considerations in mind, it is proposd by the present invention to provide an adjustable nose bridge for use with bifocal lenses which may be adjusted readily to bring either lens opposite the lens of the eye, without removing the eyeglasses or spectacles from the face, and which will be of relatively simple structure and present a sightly appearance. More particularly, the present invention comprises a bridge piece carrying the usual nose pads at its lower end and a member which is secured rigidly to and connects the inner edges of the lenses and is slidably mounted with respect to the member carrying the nose pads. The two members bear against each other. or an interposed 5 spring member, with sufilcient force to cause them to be retained frictionally in either of their adiusted positions. However, the members may be shifted relative to each other merely by overcoming the friction between the respective parts.

In order that the lenses may be shifted upwardly or downwardly while the spectacles or eyeglasses are on the face of the wearer, the member rigidly attached to the lenses preferably comprises a pair of spaced, horizontally-extending bars, or one bar and a projection extending horizontally from one or both sides of said member, and the member which carries the nose pads has a horizontally-extending bar located between the spaced bars of the slidable member. With such 20 an arrangement, to shift the relative position of the lenses it is only necessary that the cross bar of the pad-carrying member and one of the cross bars of the member which carries the lenses be engaged with the thumb and index finger and suihcient force exerted on them to overcome the sliding friction between the parts to cause the cross bar of the lens-carrying member which has been gripped to move towards the cross bar oi the nose-pad-carrying member. If the lenses are in the normal position with the distance lenses opposite the lenses of the eye, and it is desired to shift them to bring the reading lenses opposite the lenses oi,the eye, the lower cross bar of the lens-carrying member is engaged with the thumb'and the cross bar of the pad-carrying member is engaged with the index finger. When the parts are then pinched together the lens-carrying member slides upwardly on the pad-carrying member and the lenses are raised to a position where the reading lens lies opposite the eye. If it is,subsequently desired to shift the lenses back for distance vision the cross bar of the pad carrying member is engaged with the thumb and the upper bar of the lens-carrying member engaged with the index finger. when the parts are then pinched together the lens-carrying member slides downwardly on the pad-carrying member and the distance lenses are again brought opposite the lenses of the eye.

The invention will be further described in connection with the accompanying drawings, but it is to be understood that such further disclosure is by way of an exemplification and that the invention is not limited thereby, and is only limited to the extent set forth in the subiolned claims.

In the drawings:

Figure l is an elevational view of a pair of spectacles embodying the invention, being viewed from the side through which the wearer looks and showing the bridge adjusted to the position so that the lower lens will be opposite the lens of the eye,

Figure 2 is a similar view to Figure 1 with the bridge adjusted so that the upper lens is brought opposite the lens of the eye,

Figure 3 is a plan view of Figures 1 and 2,

figure 4 is a horizontal cross sectional view taken on line |4, Figure 1,

Figure 5 is a detail cross sectional view taken on line 5-5, Figure 2,

Figure 6 is a vertical sectional view through the adjustable bridge,

Figure '7 Is a perspective view of that portion of the bridge to which the lenses are secured,

Figure 8 is an elevational view partly in section of a modified form of adjustable bridge,

Figure 9 is a cross sectional view taken on line 89, Figure 8,

Figure 10 is an elevational view partly in section of another modified form of adjustable bridge, and

Figure 11 is a cross sectional view taken on line II-I I, Figure 10.

Referring to the drawings, and first to the embodiment of the invention shown in Figures 1 to 7, the adjustable bridge is shown as applied to spectacles having bifocal lenses having upper and lower lens portions I and 2 which are ground to have different foci. As is usual in bifocal lenses, the upper lenses I normally lie opposite the lenses of the eye and are ground to have a longer focal length than the lower lenses 2 and are adapted for distant vision. The lenses 2 are ground to have a shorter focal length and are the normal reading lenses. Temple bars 3 are secured to the outer edges of the lenses by means of the usual lens straps 4.

The adjustable bridge comprises two relatively slidable parts 5 and 5. The part 5 comprises a pair of vertically extending bars I which carry adjacent their lower ends lens straps l for securing the bridge part 5 rigidly to the respective lenses. The vertically extending bars 1 are connected together by a pair of vertically spaced. horizontally extending cross bars 9 and I0, one of which preferably connects the upper ends of the vertical bars I and the other of which extends between said bars in the region of the lens straps I. In order that the bridge member 5 may generally conform to the contour of the wearer's face when the spectacles are being worn, the upwardly extending bars I are preferably curved longitudinally outwardly so that they will lie close to that portion of the face where the upper part of the nose joins the lower portion of the forehead, and the horizontally extending cross bars 9 and ID are curved outwardly to better fit around the bridge of the nose.

The bridge part 6 preferably comprises an inverted U-shaped member having vertically extending legs II and a cross bar I2 connecting their upper ends and curved outwardly in the same manner as the cross bars 9 and Id of the member 5 to generally conform to the shape of the wearer's nose. Bridge pads I3, adapted to bear against opposite sides of the nose and to support the spectacles upon the face, are carried by the respective legs II of the U-shaped mem-' her I.

In order that the bridge members 5 and 5' may readily slide relative to one another. the inner sides of the vertically extending bars I and the outer sides of the legs ll of the U-shaped member are provided with complementary frictlonally engaging track portions. The particular shape of the complementary track portions of the bars I and legs II may take various forms. In this particular embodiment of the invention, each is of general V-shape and arranged in partially overlapping relation as shown in Figure 5, and with the U-shaped member Ii extending slightly inwardly from the vertically extending bars I of the member 5. The outer sides of legs II of the member 8 bear against the inner sides of the vertically extending bars of the member 5 with sumcient force to normally cause the members 5 and 6 to be held in any relative position; yet they may he slid relative to one another merely by overcoming the friction between them. There are no latches or catches which must be disengaged before they may be shifted to a different position of adjustment.

The cross bar I2 of the U-shaped member li lies between the vertically spaced cross bars 5 and Id of the member 5 and has a finger piece It extending forwardly a distance sufficient to lie in a plane passing through said bars.

In Figure 2 the spectacles are shown with the parts 5 and B shifted so that the upper or distance lenses I would lie opposite the lenses of the eyes when the spectacles are placed upon the face. If it should be desired to shift the spectacles to the position shown in Figure 1 in which the lower or reading lenses 2 would be positioned opposite the lenses of the eyes, it would only be necessary that the thumb be placed beneath the cross bar Ill and the index finger placed above the cross bar I! and/or its protruding finger piece I4 and the parts then pinched towards each other. When that Is done the member 5 will slide upwardly on the legs II of the member 5 and the parts will be shifted to the desired position of adjustment with the reading lenses opposite the lenses of the eyes, and the wearer may use the spectacles for reading purposes without subjecting the eyes to additional strain caused by an abnormal angle of vision.

If it should subsequently be desired to again shift the relative positions of the lenses I and 1 so that the distance lenses I would again lie opposite the lenses of the eyes, it would only be necessary that the thumb be placed beneath the cross bar I2 and/or its protruding finger piece I4, and the index finger placed above the cross bar 8. and the parts pinched towards each other. The member 5 will then be caused to slide downwardly on the legs II of the member 5 and the bridge members again brought into the position shown in Figure 2.

It will be noted that in adjusting the relative positions of the members 5 and 6 to bring either the distance or the reading lenses opposite the lenses of the eyes, it is not necessary that the spectacles be removed from the face and due to the frictional engagement of the legs II of the U-shaped member 8 with the vertical bars I of the member 5 the members will be maintained in either of their positions of adjustment.

In Figures 8 and 9 a modified form of the invention is shown in which the bridge member I5 has a pair of vertically extending bars I8 and a pair of vertically spaced, horizontally extending,

sons:

connecting cross-bars II and it. Track members II in the form of resilient springs are attached to the bars I! of the member II in such manner that they have at least one free end. While, as shown in Figure 8, the spring track members II are brazed or otherwise secured at their upper ends to the inner sides of the bars II, the spring track members may. if desired, be secured at a mid-point and have both their upper and lower ends free. The spring tracks I may have any desired cross sectional shape, but are preferably circular in cross section as is shown in Figure 9.

The nose-pad carrying member 20, like the corresponding member in the embodiment shown in Figures 1 to 7, comprises a pair of vertically extending bars 2| having track sections at their outer sides complementary to the spring track members I, and a cross bar 22 connecting the vertically extending bars 2| and positioned between the cross-bars l1 and I. of the bridge member l5, and provided with a finger protruding piece M.

The free ends of the spring track members I! are sprung inwardly so that they bear against the complementary track portions of the bars 2i with sufllcient friction to retain the members l5 and 20 in any relative position of adjustment.

The manner of shifting the members it and 20 relative to one another to position either the distance or reading lenses opposite the lenses of the eye is the same as has been described above in connection with the first embodiment of the invention.

In Figures and 11 a still further modification of the invention is shown, and in those figures the bridge member 22 has vertically extending bars or side parts 24 having grooves lengthwise of their inner sides, and vertically spaced, horizontally extending connecting cross-bars 25 and 26. The nose-pad carrying member 21 is generally similar in contour to the member 6 disclosed in Figures 1 to 7, and comprises vertically extending bars or side portions 28 and the horizontal bar 29 connecting the outer ends of the bars 28. As is more clearly shown in Figure 11, the track formed on the inner sides of the vertically extending bars 2! is V-shaped, and the bars 28 have their outer sides correspondingly vshaped to fit within the track of the bars 24.

The inner sides of the vertical bars 28 of the member 21 are grooved to receive a reinforcing spring member 80, which normally urges the bars 2! into frictional engagement with the track portions of the bars 24, with sufllcient friction to normally maintain the members 23 and 21 in any position to which they may be shifted.

The members 23, 21, and 30 may be termed respectively the outer, intermediate and inner sections of a combined supporting and adjusting structure for bi-i'ocal glasses and the like. The outer section is capable of being adjusted relative to the inner section and carries the lenses, the intermediate section is stationary and carries the nose pad arms and the inner section provides the resilient contacting member.

The invention has been particularly described in connection with spectacles, but it is to be understood that it might apply equally as well to eyeglasses, which do not have temple bars for retaining the glasses upon the face of the wearer.

In this specification and in the appended claims the term "nose-pads" is used in a broad sense to define those parts of the eyeglasses or spectacles, regardless of their particular structure, which rest upon the nose and support the eyeglasses or spectacles. I claim:

1. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and slidable vertically with respect to said pad-carrying member to an upper and a lower position, said second member comprising a pair 01' vertically extending parts, a cross-bar connecting said vertically extending parts and a part vertically spaced from said cross-bar and extending from one vertically extending part towards the other vertically extending part, said pad-carrying member having a cross-bar connecting the pad-carrying parts and positioned between the cross-bar and the vertically spaced part of the second member, whereby the cross-bar of the pad-carrying member and either the cross-bar or the vertically spaced part of the second member may be pinched towards each other to shift the second member into either of its positions of adjustment.

2. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and slidable vertically with respect to said pad-carrying member to an upper and a lower position, said second member comprising a pair of vertically extending parts, a cross-bar connecting said vertically extending parts and a part vertically spaced from said cross-bar and extending from one vertically extending part towards the other vertically extending part, said pad-carrying member having a cross-bar connecting the pad-carrying parts and positioned between the cross-bar and the vertically spaced part of the second member, said members bearing frictionally against each other with suiiicient force to hold the members in either position of adjustment, and said members being slidable with respect to one another merely by overcoming the friction between them.

3. In eyeglasses or spectacles having bifocal lenses, a generally U-shaped bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and slidable vertically with respect to said U-shaped member to an upper and a lower position, said second member having a pair of horizontally spaced, vertically extending bars and a pair of vertically spaced, horizontally extending cross-bars, the cross-bar of the U-shaped member being positioned between the horizontally extending bars of the second member, whereby the cross-bar of the U-shaped member and either cross-bar of the second member may be pinched towards each other to shift the second member into either of its positions of adjustment.

4. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer and comprising a pair of vertically extending bars and a connecting cross-bar, a second bridge member connected to the respective lenses and slidable vertically with respect to said pad-carrying member to 15 an upper and a lower position, said second member comprising a pair of horizontally spaced. vertically extending bars and a pair of vertically spaced, horizontally extending bars, the outer sides of the vertically extending bars of the padcarrying member and the inner sides of the vertically extending bars of the second member having complementary track portions and the track portions of the two members bearing frictionally against each other with suflicient force to hold the members in either of their positions of adiustment, said members being slidable with respect to one another merely by overcoming the friction between them.

5. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles on the face oi the wearer, a second bridge member connected to the respective lenses, one of said members having a pair of vertically extending spring track portions carried thereby and spaced therefrom and the other member having portions frictionally engaging said spring track portions, whereby the second member may slide vertically with respect to said pad-carrying member to an upper and a lower position.

6. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles on the face of the wearer, a second bridge member connected to the respective lenses, said second member having a pair of vertically extending spring track portions carried thereby and spaced therefrom and a pad-carrying member having portions frlctionaliy engaging said spring track portions, whereby the second member may slide vertically with respect to said pad-carrying member to an upper and a lower position.

'7. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles on the face of the wearer, a second bridge member connected to the respective lenses, said second member having a pair of vertically extending spring track portions carried thereby and spaced therefrom, said spring track portions having at least one free end. and the pad-carrying member having portions frictionally engaging said spring track portions, whereby the second member may slide vertically with respect to said pad-carrying member to an upper and a lower position.

8. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, a second bridge member connected to the respective lenses and comprising a pair of vertically extending barsja cross-bar connecting said vertically extending bars and a part vertically spaced from said cross-bar and extending from one vertically extending bar towards the other vertically extending bar, and spring track members carried by the vertically extending bars of the second member, said padcarrying member having track portions frictionally engaging the spring track portions of the second member and also having a cross-bar connecting the pad-carrying portions positioned between the cross-bar and the vertically spaced part of the second member whereby the cross-bar of the pad-carrying member and either the cross-bar or the vertically spaced part of the second memsons:

ber may be pinched towards each other to cause the spring tracks of the second member to slide with respect to the track portions of the pad-carrying member to shift the second member either to an upper or a lower position.

9. In eyeglasses or spectacles having bifocal lenses, 2. bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, a second bridge member connected to the respective lenses and comprising a pair of vertically extending bars and a pair of vertically spaced, horizontally extending crossbars connecting said vertically extending bars, spring track members secured to each of the vertically extending bars of said second member, the pad-carrying member having portions frictionally engaging the spring track of said second member and also having a cross-bar connecting the pad-carrying parts positioned between the crossbars of said second member whereby the cross- I bar of the pad-carrying member and either crossbar of the second member may be pinched towards each other to cause the spring tracks of the second member to slide with respect to the pad-carrying member to shift the second member either into an upper or a lower position.

10. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the lace oi the wearer, a second bridge member having vertically extending bars to which the lenses are secured, said second member also having a cross-bar connecting said vertically extending bars and a part vertically spaced from said cross-bar and extending from at least one vertical bar towards the other vertical bar, the padcarrying portion having vertically extending bars frictionally engaging the vertically extending bars of said second member and also having a connecting cross-bar positioned between the cross-bar and the vertically spaced part of the second member, whereby the cross-bar of the pad-carrying member and either the cross-bar or the vertically spaced part of the second member may be pinched towards each other to shift the second member either upwardly or downwardly with respect to the pad-carrying member. and a resilient reinforcing member for holding the vertically extending bars of the pad-carrying member in frictional engagement with the vertically extending bars of the second member with sufllcient force to cause the second member to be retained in any position of adjustment with respect to the pad-carrying member.

11, In eyeglasses or spectacles having bifocal lenses, a bridge member comprising a pair of vertically extending parts and a connecting cross bar, pad portions carried by the vertically extending parts adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, a second bridge member connected to the respective lenses and slidable vertically with respect to said firstmentioned bridge member to an upper and a lower position, said second bridge member comprising a pair oi vertically extending parts frictionally bearing against the vertically extending parts of the first mentioned bridge member, a cross-bar connecting said vertically extending parts and a part vertically spaced from said cross-bar and extending from one vertically extending part towards the other vertically extending part, the cross-bar of said first-mentioned bridge member being positioned between the cross-bar and the vertically spaced part of the second member, whereby the crossbar of the first-mentioned bridge member and either the cross-bar or the vertically spaced part of the second bridge member may be pinched towards each other to shift the second bridge member into either of its positions of adjustment, and a U-shaped resilient reinforcing member having the legs thereof bearing against the inner sides of the vertically extending parts of the first bridge member for holding said parts in frictional engagement with the vertically extending parts of the second bridge member with sufflcient force to hold the members in either position of adjustment.

12. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, a second bridge member connected to the respective lenses and slidable vertically with respect to said pad-carrying member to an upper and a lower position, said second member comprising a pair of vertically extending parts, a cross-bar connecting said vertically extending parts and a part vertically spaced from said cross-bar and extending from one vertically extending part towards the other vertically extending part, said pad-carrying member having a cross-bar connecting the padcarrying parts and positioned between the crossbar and the vertically spaced part of the second member, whereby the cross-bar of the pad-carrying member and either the crossbar or the vertically spaced part of the second member may be pinched towards each other to shift the second member into either of its positions of adjustment, the vertically extending parts of the first bridge member being grooved on their inner edges, and a resilient reinforcing member having parts thereof positioned in said grooves for holding the vertically extending parts of said bridge member in frictional engagement with the vertically extending parts of the second bridge member with sufficient force to hold the bridge members in either position of adjustment.

13. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and movable with respect to said pad-carrying member to an upper and lower position, the said bridge members being so related as to provide for frictionally retaining the second bridge member in selected positions of adjustment, the said bridge members including upper horizontally disposed bridging portions each having an outwardly directed curvature and arranged in offset relation, the bridging portion of the first named member being formed with an outwardly directed part to provide a finger engaging portion to facilitate shifting the lenses into upper or lower positions, while the eyeglasses or spectacles are being worn.

14. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and slidabie vertically with respect to said pad-carrying member to an upper and lower position, said second member comprising a pair of vertically extending parts, a cross-bar connecting said vertically extending parts and a part vertically spaced from said cross-bar and extending from one vertically extending part towards the other vertically extending part, said pad-carrying member having a cross-bar connecting the pad-carrying parts and positioned between the cross-bar and the vertically spaced part of the second member, said pad-carrying cross-bar being formed to provide a finger engaging portion, whereby the cross-bar of the pad-carrying member and either the crossbar or the vertically spaced part of the second member may be pinched towards each other to shift the second member into either of its positions of adjustment.

15. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and slidable vertically with respect to said pad-carrying member to an upper and lower position, said second member comprising a pair of vertically extending parts, a cross-bar connecting said vertically extending parts and a part vertically spaced from said cross-bar and extending from one vertically extending part towards the other vertically extending part, said pad-carrying member having a cross-bar connecting the pad-carrying parts and positioned between the cross-bar and the vertically spaced part of the second member, said pad-carrying cross-bar being formed to provide a projecting finger engaging piece, whereby the cross-bar of the pad-carrying member and either the cross-bar or the vertically spaced part of the second member may be pinched towards each other to shift the second member into either of its positions of adjustment.

16. In eyeglasses or spectacles having bifocal lenses, a bridge member having pad portions adapted to bear against opposite sides of the nose and to support the eyeglasses or spectacles upon the face of the wearer, and a second bridge member connected to the respective lenses and movable with respect to said pad-carrying member to an upper and lower position, the said bridge members being so related as to provide for frictionally retaining the second bridge member in selected position of adjustment, the said bridge members including superposed horizontally disposed outwardly projected arcuate-shaped bridging portions for engagement by the fingers of a wearer of the eyeglasses or spectacles, the first mentioned member having its bridging portion formed approximately centrally of its front with an outwardly directed part to provide a finger engageable portion to facilitate shifting the said second member into upper or lower positions of adjustment while the spectacles or eyeglasses are being worn.

1'7. In a combined supporting and adjusting structure for bi-focal glasses and the like, said structure being formed respectively of a vertically adjustable outer section including side parts for carrying the lenses, said parts being grooved on their inner sides to provide tracks; a stationary intermediate section arranged within the outer section and including side portions positioned in said tracks carrying nose pad arms, the said side portions being grooved on their inner faces; and a contractible and expandible inner section arranged within the intermediate section including side parts bearing in the grooves of the said side portions for maintaining these latter in frictional slidable engagement with said tracks to releasably hold said outer section in adjusted relation to the intermediate section.

18. In a combined supporting and adjusting structure for bi-iocal glasses and the like including a vertically movable shiitable section formed with side parts for carrying the lenses. said aide parts being provided at their inner sides with grooves to constitute tracks. a stationary section formed with side portions positioned in said tracks and carrying nose-pad arms. and spring means arranged within and coacting with the side portlons of the stationary section for maintaining them in frictional slidable engagement with said tracks to retain the adjustable section in adjusted position.

ALI-HUS O. YOE.

CERTIFICATE OF CORRECTION.

Reissue No. 20,752. May 17, 1958 ALPHUS o. YOE.

It is hereby certified that error appears in the above numbered patent requiring correction as follows: In the grant, line 2, and in the heading to the printed specification, line b residence of assignee, for "Brookeville Indiana" read Brookeville, Maryland; and. that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 28th day of June, A. D. 1958.

Henry Van Aredale,

(Seal) Acting Commissioner. of Patents.

Images