US1454200A - Anteus glass - Google Patents

Description

Patented May 8, 1923.

UNITEDl STATES PATENT OFFICE.

.ToEL c. vvErnssv AND EDGAE D. TILLYEE, or soU'rHDnIDGE, MASSACHUSETTS; SAID TILLYER AssIGNoE 'ro SAID WELLS.

A. AN'mEUs GLASS.

Application ledfnay i3,

To all wilma t may concern.:

Be it known that we, JOEL C. VELLs and EDGAR D. TTLLYER, citizens of the United v surface of the lens so that they will be especially valuable for use in various types of goggles and the like. Y

The main object of our invention is the process of forming a lens particularly adapted for use in goggles and the like where it is sometimes necessary to have the convex surface of the lens withstand a com'- paratively heavy blow with the Vassurance of the fact that the lens will not be shattered Z5 or broken over the contact of the blow and thus protect the eyes of the wearer.

A further object `of our invention is the process of forming a hardened lens which consists in heating a lens blank to produce this convex surface causing vthe same to contract in the cooling of the concave surface slowly which will tend to exert a pull on the hardened convex surface'producing a compression in the convex surface and a tension in the concave surface. A

A further object of the invention is the provision of a lens of the above characterwhich can be produced at a comparatively provide an effective protection for-the eyes of the wearer. i

With the above and other objects in view the inventionconsists in the novel features of construction, the combination and arrange- .ment of parts hereinafter more fully set forth, pointed out in the claims and shown in the accompanying drawings, in which- F'rgure I is a front elevation of a pair ofk goggles including, our im ro'ved lens.

. Fi re II is 'a' side e evation of a nonlinished lens' blank.

Figure III is aside elevation of a nished lens blank. ,gf Figure- IV kis a, transverse sectlon of a a convex surface and then suddenly cooling low cost and which at the same time will Y 1922.A Serial NO.' 560,614. l

heating furnace for producing the concave on the lens.

Figure V isa vertical section illustrating the lens upon the supporting ring prior to heating. i

Figure VI is a transverse section showing the lens in a reformed condition.

Figure VII is a longitudinal sectionA thru a cooling device showing the lens in position for coolino' theconvex surface, and

Figure bVIII is a longitudinal sectional view of la finished lens constructed in accordance with our improved process.

Referring to the drawings which we have used for illustrating the use of our improved -lens and the manner of carrying out the process, the numeral 1A indicates the Xlens framesof a pair of goggles in which the lenses 2 are mounted. The goggles are provided with the usual temples 3 for supporting the same upon the face of the wearer,

the lenses illustrated herein being of our improved type. i

The process of forming our improved lens consists inl taking a rough lens blank 4 which is shown in Figure VII for grinding and polishing the opposed surfaces of the` lenses until they are ground down to the proper .thickness :1s-shown in Figure III. It is .preferred to have the surfaces of the lens I polished prior to hardening as will be set forth hereafter as the hardening of the lens will not destroy .polished surfaces..

In Figure III the lens is shown-with` two polished surfaces 5 and 6 and after a lens has been polished to the required condition it is placed upon a supporting ring 7 having an inwardly inclined bevel portion 8 as illustrated in Figure V.

The ring 7 is preferably arranged within a heating furnace 9 andthe lensl arranged within the furnace and mounted upon the upper edge of the.ring. The furnace 9 is heated to the required temperature which will soften the lens and cause the lower Surface thereof ,to drop downwardly as illustrated in Figure VI, the face of the lens adjacent the edge resting upon the inclined Surface 8 to thus produce a true arc on the convex surface of the lens. In order to regulate the required amount of temperature necessary to cause the lens to drop as shown in FigureVI a thermometer lOvis arranged Within the furnace with the upper end projecting thru thereof f the furnace so that 110 mil/shattered or broken over the contact .of the the temperature may be readily regulated by the operator.

After the lens has been heated and formed to the proper shape as illustrated in Figure VI it is quickl transferred to a cooling device which inc udes the supporting plate 11 having a chamber 12 arranged beneath the plate in the form of a concave pocket and communicating with the chamber is an inlet tube 13 which communicates with the interior of the chamber 12 to provide a suitable air pressure which is distributed over the convex surface 6 of the lens by means of a plurality of perforations 14 formed in the late 11 whereby the convex surface of the ens will be quickly cooled which will cause the same to contract, set and harden while the upper or concave surface of the lens is in a softened state.

Attention is called to the fact that when the soft surface on the concave side of the lens begins to cool it will slowly tend to produce a pulling on the hardened convex surface of the lens producing a compression in the convex surface 6 of the lens anda tension in the concave surface 5 of the lens.

In .Figure VIII the direction of the arrows on the convex surface of the lens illustrates the direction in which the contraction takes place while the arrows on the concave surface indicates the expansion of the softened selfside of the lens prior to cooling.

From the above it will be apparent that after a lens. has been lut thru the/above rocess,-the convex sur ace of the lens will in a suiliciently heated condition to with- -stand comparatively severe blows on the surface of the lens `without the lens being blow.

In the art of manufacturing glass it is a well known fact that glass under compression is much stronger than glass under tension and it is, therefore, one of the principal objects of our process to vproduce compres sion upon the convex surface of the lens with a tension in. the concave surface as it is the convex surface of thelens which must withstand any blows.

It will also be apparent that our improved process is comparatively inexpensive to carry out and at the same time will produce a lens which will be extremely effective for the use to which it is to be applied.

We claim:

1. The process of producing protection lenses consisting in heating the lens uniformly and subsequently cooling one face of the lens while theI other is in aplastic condition. l

2. The process of producing a tempered lens consisting in uniformly heating the lens blank, suddenly cooling one surface thereof, and allowing the opposite surface to cool naturally.

3. The process of producing a tempered lens consisting in finishing the surfaces of a glass blank, subjecting the parts to heat which will drop the finished blank to desired curve and suddenly chilling one face of the blank to produce a surface tension thereof.

4:. As an article of manufacture a lens blank having opposite inherent stresses on the respective faces thereof.

5. The process of producing a curved protection lens consisting in surfacing the faces f,

of the lens in flat form, subjecting the blanks after surfacing to suicient heatl to drop the lens to desired curve without 1mpairment of the polished surfaces thereof,

and suddenly chilling one face of the blank to produce a surface tension in the finished blank, increasing the resisting properties thereof.

6. The process of producing a shock resisting ophthalmic lens consistlng in heating the lens to a plastic condition and causing` one face of the lens to harden and set in advance of the other whereby the contraction of the later cooling surface will produce a compression as respects the first cooled surface, causing a surface tension effect therein.

JOEL C. WELLS. EDGAR D. TILLYER.

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