US1274807A - Mounting. - Google Patents

Description

r. A. STEVENS.

MOUNTING.

APPLICATION man our. 13. 1917.

Patented Aug. 6, 1918.

iii 07 72 e UNITED STATES PATENT OFFICE.

FREDERICK A. STEVENS, 0 F PROVIDENCE, RHODE ISLAND, ASSIGNOR TO STEVENS AND COMPANY, INCORPORATED, A CORPORATION OF RHODE ISLAND.

MOUNTING.

Specification of Letters Patent.

Patented Aug. 6, 1918.

Application filed October 13, 1917. Serial No. 196,518.

T 0 all whom it may concern:

Be it known that I, Fnnnnmcu A. STEVENS, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island,.have invented certain new and useful Improve ments in Mountings, of which the following is a specification.

My invention relates to mountings of the finger piece type for eyeglasses and spectacles.

In this type of mountings it is desirable, in order to distribute the strain and avoid excessive wear, that there bea substantial bearing area of the lever arm upon the relatively fixed pivot member or post. For this reason an axial tube 'or sleeve, formed on the arm, surrounds the entire-length of the 'pivot member. This has proved unsatisfactorybecause the upper coilor coils of the helical actuating spring which .er'nbrace the sleeve are worn and weakened by the oscillation of the sleeve when the arm, to which the movable end of the spring is attached, is vibrated. Furthermore the upper sprin coil, which was nearest the fixed end of t e spring exerted such pressure against the sleeve that the movement of the latter tended to bind or to exhaust and derange the spring after much use.

The essential objects of my invention are to overcome the enumerated disadvantages and to attain in a single structure the advantages of an extended lever bearing without injury to the hearing or to the s ring; also to insure a smooth and unimpeded 0scillation of the lever; and to attain these ends in an inexpensive structure embodying a minimum of parts.

In the accompanying drawings which form a part of this specification,

Figure 1 is a front elevation of a pair of eyeglasses embodying my invention,

Flg. 2, a plan view of the device,

Fig. 3, an enlarged section on line 3-3 of Fig. 2, and

Fig. 4, a similar section on line 4:4: of Fig. 3.

Like reference characters indicate like parts throughout the views.

In the form of my invention herein shown 5 represents the lenses, 6 the bridge or nose piece, 7 the flattened supports or bridge end portions, 8 the straps, 9 the lugs, and 10 the lens attaching screws of a pair of eyeglasses or spectacles. In conjunction with these parts are the operatin levers 12 having the finger portions 13 an nose guard portions 14. upon their respective ends. The intermediate portion of each lercr has an opening 16 bounded by a vertical tube or sleeve 17.

Each end portion 7 of the bridge has a threaded opening 19 to receive the threads 21 of the reduced end 22 of a post having a body or shank portion 2 1 of reatcr diameter, forming a resulting shou der 25 which abuts a ainst the upper face of the support. l he upper portion 26 of the post is of enlarged diameter forming an annular shoulder whose lower face slidably engages a flat ring 27 loose on the post and resting upon the upper end of the tube 17 which a so surrounds the portion 24 of the post. The diameter of the shoulder 26 is of such dimension that its periphery is continuous with that of the outer faces of the ring and tube. On top of the shoulder 26 is a laterally extending circular head 28 provided in this instance with a slot 29 to receive a screw driver.

The actuating spring 30 is helical in form, comprising a plurality of superposed coils. The upper coil or coils 31 thereof embraces the cy indrical shoulder 26 and the remaining coils 32 loosely surround the ring 27 and sleeve 17 of the guard. Continuous with the upper coil of the spring is the rearwardly directed arm or end 34 whose bent end presses against the rear of the adjacent strap 8. The lowermost of the coils 32 rests upon the lever 12 and is continued rearwardly to form an arm 36 whose end 37 is laterally bent to engage the rear portion of the lever arm 12.

The eflect of each sprin 30 is to press the lards 14 inwardly tower each other upon t e nose of the wearer, and release of the lards is attained by manually compressing t e finger portions 13 of the levers. The spring arm 34 is relatively stationary, and t e arm 36 is radially movable. It will be observed therefore, that the uppermost coil 31 is the one which is most violently or strongly engaged with its surrounded member. That is to say the post presses most intensely upon the coil at or adjacent the point 40, as shown in Fig. 4, whenever the lever 12 is operated. This tension or grip, therefore, is exerted on the stationary memor wearing action uponthegspliing, but also.

no impediment to the oscillatory movement of the sleeve. Durlng stress on the spring there is 301110 frictional contact of the lower coils 32 with, the ringer. sleeve, as shown in broken lines in Fig. 3. hevfriqtiql rbetween the spring and sleeve is essened by t 10 preseneo f the ring in conjnnctipp, with the, l e e. 1" a d the verveea eemt 1: ream} t 'ecdo n- Ha s t e e c i ed W i ii lw ive e hqgli men t'of my invention, it is mglergtqml that she, specifip terms employe are ,used, in oscriptive sense only, aml are not IEQII the purpose of limitation, the scope oi the inreat on be i g defined l) C 3. 1

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