US1485789A - Eyepiece frame - Google Patents

Description

March 4- 119241 a 11,485,789

' F. A. LOGAN EYEPIECE FRAME Filed Jan. 8, 1923 2e cloth, etc.

53,0 of the fabric.

co which causes the eye-piece to 45 same to the fabric.

Patented new. a, 192%.

was? LOGAN,

PATENT @FFEQE- OF WGEWOOD, MARYLAND, ASSIG-NOR T MINE SAFETY-APPLIE- Ittttfitt ANCES-GQ, 0F PITTSBURGH, PENNSYLV.

EYEPIECE ramer.

' To all whom it mayco'ncern:

'Be it known that L'FRANK A. LOGAN, a citizen of the United States, residing at Edgewood, Maryland, in the county of Harford and State. of Maryland, have invented certain new and useful Improvements in Eyepiece Frames,of which the following is a specification.

This invention relates to improvements in m eye-piece. frames of gas masks and the like and to the, manner of securing the'frames' thereto.

, Among the objects of this inventioh is to provide a novel eye-piece frame and means s for securing it to the fabric of gas masks or the like, and more particularly, fabrics such as pliable rubber with or without outer coverings or inner layers of stockinet or rubberized fabric, such as rubberized duck, sail -A still further object of this invention is to provide an eye-pzeceframe and means for fixing same to ch fabrics so that the union will bepermanentfand the durability e and life of the fabric remain unimpaired. w

According'to present means for securing eye-piece frames to such fabrics, the metal frames are fastened to the fabric so as to give a tight initial grip over a small area This initial grip results in substantially complete compression of the rubber of the fabric and the effect is to deaden the rubber of the fabric at the portions subjected tossuch eat strain very soon after the eye-piece rame is attached thereto. When this occurs the fabric becomes so weakened that a slight strain or pull will destroy the gas tightness of the mask and often cause the fabric to break at such place, part from the rest of the mask.

My invention is disadvantages incident to the prior types of eye-piece frames and the means for securing In carrying out my invention, l' have provided a new construction of eye-piece so thatthe maximum compression of the rubber is only about 20-50% of the possible amount. Furthermore, the

designed to overcome these Application filed January 8, 1923. Serial No. GUAM.

compressionds not local as in the prior types of gas mask' eye-pieces, but is distributed over a large area. I obtain absolute gas tightness at the junction of. the eye-piece frame with the fabric and also a tighter grip of the fabric without subjecting the rubber stock to the injurious actionincident to the other methods of fastening the prior types of evep ece frames to the fabric. The efi'ect'is to givelasting qualities to the gas. mask, and when my new type'of eye-piece is secured to the fabric according to the means to be later illustrated the fabric will not pull or break away from the eye-piece frame even after a long interval from the time that the eyepiece frame has been attached thereto. Reference is to be had to the accompanylng drawings, wherein l have illustrated a specific embodiment. of my invention. Fig. 1 is a cross-sectional {view showing the rela tive position of the fabric to the inner ring and outer retaining ring before the fabric has been secured to the frame. Fig. 2 is 'a cross-sectional view showing the fabric of the mask secured by the inner ring and the outer retaining ring. Fig. 3 is a cross-sectional view showing the lens and lens holder upon the eye-piece frame after the fabric has been secured thereto and before the lens has been permanently fastened thereto. Fig. 4 is a cross sectional view showing the lens eye-piece, frame.

The fabric} of the gas mask or the like is stretched over the inner ring 2 commonly known as a grommet ring. One end of this ring has the bead 3, which is preferably on the outer peri hery of the ring. The original and lens holder permanently secured to the retaming'ring so as to receive a portion of the fabric 4 1n the intervening space and thus afiord a better grip for the fabric when it is secured to the eye-piece frame as will be shown, later.

'. After the inner ring 2 and retaining ring 5 are positioned upon the fabric,-as shown in Fig. 1, the portion 90f the inner ring 2, opposite the head 3, is turned into the pocket formed by the inturned portion 6 and wall 8. The portion 4 of the fabric is thereby turned into this by the inner ring -2 and the walls of the pocket of. theretaining ring 5. The part 9 of the retaining ringis turned so. that there will be only partial compression of the fabric 41:, preferably not more than about of the greatest possible compression.

It will be seen by reference to Fig. 2 that v i not onlydoes the edge 10 of the inner ring 1 grip the fabric 4, but that substantially a of the curved portion of the inner ring 2 co-operating with the inturned portion 6 of the retaining ring acts to hold the curled fabric secured to the metal'parts of the eye- Should the edge 10 of the inner ring grip the fabric t excessively so as to impair or deaden the quality of the rubher at such point, any tendency of the fabric at such point to separate from the eyepiece frame would be counteracted by the fabric grip over the wide area of the curled y the curved portion 9 of the-inner ring and the inturned portion 6 of the retaining ring. A portion of the fabric 4:, it will be observed, enters the portion of the pocket which is between the bead 7 and the wall 8. With the fabric so secured. by the inner ring and the outer retaining ring, should there be any tendency for the fabric to be ulled away from the eye-piece frame, sue vpull will cause the head to be drawn towar -the head 3, thus increasing the grip upon I the fabric at such place, and thereby ah ord- 7 mg an additional securing means. The inside diameter ofthe head on the retaining ring is only slightly vlarger than the outside dlameter on the inner or grommet ring. so, that when these heads are drawn togetherthe eagp on the rubber is tightened.

\ lln ig. 3 ll have shown the lens 11 and the lens holder 12 stated in ghe retaining 5a ring after the fabric-'1 has be the eye-piece frame. ll b'er washer 13 between metal portion bet the inner ring, so as to protect the'lens and also make a gas-tight joint. The lens 11 and lens holder 12 are permanently secured to the frame ofthe n secured to prefer to place a rub- .eye-piece by turning the flange 14: of the retaming ring 5 down upon the flange 15 of the lens holder 12, as illustrated in Fig. 4:.

e present invention is not limited to pocket and is held gripped the lens 11- and the.

View of the numerous modifications which may be effected therein without departing from the spirit and scope of this lnventlon,

. it is desiredthat only such limitations be imposed as are indicated in the appended claims. 1

I claim as my invention;

1. In an eye-piece frame for gas masks and the like,- a retainingring having an end beaded and an annular pocket formed by an inturned portion of the ring adjacent to said bead and the unbeaded portion adjacent to the inturned portion for receivingWhe fabric to be secured to said eye-piece, an in,- her ring beaded at an end and having the other end turned outwardly and projecting gate said pocket of said retainingring, sald ad the fabric of the gas maskand the like secured between said rings.

2. In an eye-piece frame for gas masks and the likefa retaining rin having an end beaded and an annular poc et formed by an'inturned portion o'f'the ring adjacent to said s cmoperating with each other to retain head and the unbeaded portion adjacent to i beaded at an end'and having the other end turned outwardly and projecting into said pocket of saidretaining ring, said beads cooperating with each other to retain the fab- 'ricof the gas mask and the like secured between said rings.

3. In an eye-piece frame for gas masks and the like, a retaining ring having an end headed and an annular pocket formed by an inturned portionbf the ring adjacent to said head and the unbeaded portion adjacent to the inturned portion for receiving the fabric to be secured to said eye-piece, an inner ring having an outer bead at an end and the other end turned outwardly and projecting into said pocket of said retaining ring, said beads co-operating with each other to retain the fabric of the gasmask and the like secured between said rings.-

t. .-l[n an eyepiece frame for gas masks and the like, beaded arid an annular pocket formed by an inturned portion of the ring adjacent to said bead and the unbeaded portion adjacent to the inturned 'portionfor receiving the fabric said head projecting into said pocket, an inner ring having an outer head at .an end and the other end turned outwardly and projecting into said pocket of said retaining ring. said beads co-operating with each other to retain the fabric of the gas mask and the like secured between said rings.

5. An eye-piece frame for gas masks and a retaining ring having an end like face pieces, comprising an outer retaining ring having an inturned edge forming I with the wall of the ring an internal annugripping the folded edge of said fabric an 1 lar pocket, the fabric of the gas mask or embracing the inturned edge of'said retain- 5 other face piece being provided with an ing ring.

eye-piece opening having its edge adjacent i to said opening folded around said inturned FRANK A. LOGAN.

edge of said retaining ring, and an inner ring formlng an external annular pocket

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