US1339974A - Lens-mount - Google Patents

Description

F. A. PERSOHN.

LENS MOUNT.

APPLICATION FILED DIzc.s. I9I7.

Patented May 11, 1920.

3 nue ntoz FRANK A. PERsoHN, or BALTIMORE-MARYLAD.

LENS-MOUNT.

Specification of Letters Patent.

Application led December 8, 1917. Serial No. 206,135.

17 'o all whom t may concern Be it known that I, FRANK A. PERsoHN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Lens-Mounts, of which-the following is a specification.

This invention relates to improvements in lens mounts for eye-glasses orA spectacles and has for one of its objects to provide an improved means for maintaining a lateral strain` on the securing screws by which the lenses are held, whereby to very materially lessen the liabilityv of the screws working loose and allow the lenses to rock on the screws.

Another object of the invention is to provide exceedingly simple and cheap means forengaging the rim edge of the lens to exert a constant lateral pressure on the lens in a direction at right angles to the axis of the retaining screws and maintain the lens in proper relation to the bridge.`

IVith these, and other objects in view, the

invention is illustrated in the accompanying drawing in which- Figure 1, shows the inner portions of two lenses with the bridge connecting the same and with my improved device attached thereto,-the parts being shown in front elevation. l

Fig. 2, illustrates on an enlarged scale, a vertical section through the improved lens strap and clamp. Fig. 3, shows the improved lens strapjand clamp in edge view and looking between the clamping jaws thereof.

' Fig. 4, illustrates inperspective, the detached spring plate that 40 clamping jaws.'

Fig. 5, shows in side elevation the strap ang clamp and the attached spring plate, an

Fig. 6, illustrates on an enlargedscalevand in front elevation. a portion of a lens with my improved device attached thereto. y

Referring to the drawing, the numeral 7, designates the. lenses having the usual rimedges 8, vand connected by a bridge bar. 9,

of any preferred form.x j 'Each end o f the bridge 9, is connected to a strap 10, which latter has a concave side 11, that conforms to the'rim-e'dge 8, of the lens andsaid strap is provided with two fits between' the clamping jaws 12, which project from oplposite edges of the concave sidesxof the strap.

By reference to Figs. 2 and ing, it will be seen that a tang 13, projects laterally between the jaws 12, from the concave sider of the strap,-the tang in this instance being formed by metal punched laterally from the strap but not entirelyI separated from said strap. This tang 113, thereforehas'position at the concave side of the strap and between the two clamping jaws 12, as clearly shown in Fig. 3,1of the drawing. g I j In carrying out my invention I employ a spring plate 14, between theconcave side of Patented May 11, 1920.

the strap and the convex rim-edge 8, ofthe lens and this spring plate has a concaveconvex shape and is of a width to fit between the clamping jaws 12. A perforation 15, is provided in the spring plate midway betweenthe free spring-ends 16, thereof, and this spring plateLis designed to be inserted between the clamping jaws 12,l with" its convex side confronting the concave sur-j face of the strap so that when in position,

the tang 13 on the strap may pass through...

theperforatio 15,-from the lconvex to the concave yside'of the spring plate .and its extreme end then be riveted at the concave side of the spring plate to securely hold the spring plateto the strap and between the clamping jaws 12. Y

By referring to Fig. 5,|of the drawing it will be seen that the curve of the sprmg.

plate 14, is sharper or of a smaller radius j than the curve of the strap so that the free ends 16, of said plate will extend or` project away from the concave side of the strap.

The lenses are` provided. with the usual screw receiving perforations which are so positioned that when the edge of the lens is inserted between the clamplng jaws 12, its rim-edge 8, which has a curve of a greater radius than that of lthe spring plate, will' be engaged by said spring plateends 16, andv these ends will yield as the lens is forced between the clamping jaws to bring thelens perforation into register with the `perforaico tion 17, in said'jaws.k` A screw 18, may then -bel passed through one jaw, then through the lens. perforation and finally screwed into the lother jaw as is ycommon in lens mountings), to secure the lens between the jaws.

I When the lens foration in the bind the screw against the -walls of the lens perforation and thereby lock the screw against accidental rotation that results in loosening the clamping jaws and allows the lens to rock on the screw. This loosening and rocking of the lens between the clamping jaws is therefore avoided by the use of the spring plate.

It will be noted that my improved means including the strap, spring plate and the means for securing them together is produced from the two parts that may readily be stamped from metal and that the spring plate is securely fastened to the strap against displacement without the use of a third part or fastening device.

I-Iaving described my invention, what I claim is,- y

The combination with a lens, of a strap having a concave side and two spaced apart clamping aws projecting from said concave side and straddling the lens,'-said strap having a tang projecting from its concave side at a point between said jaws, and a' spring plate seated v.against the strap between the jaws and provided with a perforation through which the tang projects to hold the spring plate against movement with respect to the jaws.

In testimony whereof I aix my signature inv the presence of two witnesses.

FRANK A. PERsoHN.

Witnesses:

CHARLES B. MANN, Jr.,

HELEN B. WUNDER.

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