US1337086A - Lens-holder - Google Patents

Description

S, G. MARSHALL.

LENS HOLDER.

APPLICATION FILED MAY 21,1919.

Patented Apr. 13, 1929.

UNITED STATES PATENT OFFIGE.

STANLEY G. MARSHALL, 0F HEBBRONVILLE, TEXAS.

LENS-HOLDER.

Application filed May 21, 1919.

To all whom it may concern:

Be .it known that I, STANLEY G. MARsHALL, a citizen of the United States of America, residing at Hebbronville, in the county of Jim Hogg and State of Texas, have invented new and useful Improvements in Lens-Holders, of which the following is a specification.

The object of the invention is to provide a simple, relatively inexpensive and efficient means whereby a lens may be seated and secured in place in a lamp casing of the type for example used in connection with automobile head and side lights. to insure the fastening of the same against vibration and displacement while permitting the removal thereof when required for cleansing and substitution.

Further objects and advantages of the invention. will appear hereinafter, it being understood that changes in form and proportions may be resorted to within the scope of the claim without departing from the principles involved.

In the drawings;

Figure l is a sectional view of a lamp casing provided with a lens securing device constructed in accordance with the invention.

Fig. 2 is a transverse sectional view on the plane indicated by the line 2-2 of Fig. 1.

Fig. 3 is a detail sectional view through one of the cam tongues as indicated by the line of Fig. 2.

lVithin a casing 10 which may be of the ordnary or any preferred type and is provided vith the usual reflector 11 and lens cap 12 having the lens seat 13, is a lens 14 between which and the lens seat is interposed an annular cushion 15., of rubber or fiber or equivalent material. The lens 1+: is held seated by the fastening means which consists of a retainer ring 16, shown in face view in Fig. 2. This ring is adapted to exert a pressure towa rd the plane of the seat so as to clamp the lens in place thereon. Attached to and disposed in angular relation with the seat are cam tongues 17, the attachment of each tongue being at one end so as to leave the other end free and slightly deflected from the plane of the lens arranged properly upon the seat, while the retainer Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 298,756.

which is of annular form, is provided at intervals corresponding with those between said cam tongues with riders 18 designed to engage under the free ends of the tongues and to slide back toward the points of attachment on said tongues to the seat in order to exert the desired pressure upon the lens to lock it in the desired position.

Preferably the tongues are of spring metal or the equivalent so as to be more or less resilient and thusadd to the eficiency thereof in holding the lens by reason of pressure upon the retainer ring against vibration under the arring to which lamps of the type indicated are subjected in use. Also the re tainer ring preferably consists of inner and outer annular concentric elements 19 and 20, spaced apart to form slots 21 intersected at intervals by the riders 18 which serve to connect said elements, and in applying the ring after the seating of the lens the slots between the concentric members of the former are alined with the tongues after which the ring is turned to cause the engagement and clamping action above indicated.

is a cushioning means between the re tainer ring and the lens a sheath 22 may be fitted upon the inner element of the retainer ring to bear against the surface of the lens. It will be noted that this sheath, in addition to its cushioning effect, may, if of rubber or similar adhesive material. serve effectively as a means of preventing the accidental loosening of the retainer by jarring or otherwise, while permitting the reverse turning movement thereof to release the lens when it is desired to remove the latter for the purpose of cleaning or for the substitution of a lens of a different type or color.

What is claimed is:

A lamp casing having a lens seat cam tongues projecting at intervals from said seat, a retainer ring consisting of inner and outer concentric elements and spaced riders connecting said elements for engagement respect-ively with said tongues. and a frictional cushioning sheath fitted upon the inner element of the retainer ring for contact with the surface of a seated lens.

In testimony whereof I my signature.

STnl LE Y G. MARSHALL.

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