US179735A - Improvement in window-shade rollers - Google Patents

Description

J. SHOREY.

WINDOW-SHADE ROLLER.

' Patented Ju1y11,1876.

ms? fafa/a):

UNITED STATES vPATENT OFF1OE.

JOHN SHOEEY, OE LOWELL, MASSACHUSETTS, vASS'IGNOR or ONE-HALE Hts EIGHT To OLIVER o. SHOEEY, or SAME PLACE.

IMPROVEMENT IN wmlnow-sH-ADE RoLLERs.

Specification forming part of Letters Patent No. l 79,735, dated July 11, 1876; application'iled December 18, 1872.

brackets, the roller being eut away to show the inside construction thereof; Fig. 2, a view ofthe metallicspindle in the roller; Fig. 3, an end View ot' the hub or solid part ot' the roller, having notches therein, for the purpose herein specified; Fig. 4, aview of the lefthand bracket; Fig. 5, a view of the righthand bracket.

Like letters designate corresponding parts in all of the figures.

The nature of my invention consists, first, in an improved torsion-spring for windowshade rollers, being constructed with its coils ot' different diameters, whereby the tension of the spring iS strengthened through a portion of itsrlength, substantially as herein set forth; second, in a notched head or hub ofthe roller, in combination with the spindle, provided with an arm or projection to take into saidnotches when the roller is removed from the brackets, and with a spring to force the arm into the, notches when the roller is removed from the brackets, the connecting parts being constructed and arranged substantially as hereinafter set forth, and for the purpose Speciiied.

The improved spiral spring la, which constitutes the ijrst feature of my invention, and is shown in Fig. l, has about one-third of its length smaller in diameter than the remaining two-thirds of .the spring, its smaller end heilig fastened to a socket, m, placed within the roller z', and its larger end being fastened to the spindle, or to a wooden attachment, g, of the metallic spindle e. One end vof this spindle is made hat, so that it will be held without revolving in a notch of the bracket d. The other end of the roller z' has a pivot, which turns in a socket, z, ofthe bracket a, Fig. 4. When the roller z' is placed in its brackets a d, Figs. 4 and 5, and the shade is pulled down, the spring h begins to wind at the small end, and that ,part having coils of less diameter has more power than the other part ofthe Spring; and this greater power is exerted when the shade begins 4to unwind, and its folds or coils are ot' larger diameter, and require more force of spring to sustain their weight; but as the shade becomes further unwound, and its coils become smaller and lighter, the larger part of the sprin g comes into action and exerts less power; consequently the spring' is selfcompensating to the varying rate of the uncoiling ofthe window-shade.

The Same, or nearly the same, result as above may be accomplished by using two sizes of wire indifferent parts of the spring, while the coils remain of the same diameter, instead of the smaller coils, as above set forth, using correspondingly larger wire, and vice versa, the two wires being', of course, secured together, so as to act as one spring; or, as a further modification, the diameter ofthe Spring ma-y be regularly smaller from one end to the other, the degree being proportioned to the variation in the rate of the unwinding of the shade with a given number ofcils.

The shaft e, Fig. 2, has an arm or projec- 'tion, s, thereon, and this shaft passes through the head or hubfof the roller, which head or hub has one or more notches, o o, into which the arm s can enter. The socket m contains a spiral spring, u, the end ot' which has a short plug, r, to keep the pivot end of the spindle g from contact with the said spring. Thus, when the roller'il is out ot' the brackets the spring n forces the Shaft e endwise, and causes the arm s to enter one of the notches 0 o in the hub fot' the roller, and thus holds the spring h from uncoiling; but when the roller t' isagain placed in its brackets a d the shaft e is, by thev brackets, forced back endwise against t-he force ot' the spring a, thereby disengaging the arm or projection s from its notch o, and allowing the roller to freely turn, as desired. The whole device acts automatically, and is sure in its action.

l disclaim an automatic spring-clutch attached to a curtain-roller to prevent the un- `ceiling of the Spring when the roller is detached -from its brackets; but

What I claim as my invention7 and desire tion, with a, hub or head, f, provided Lith to secure by Letters Patent, is notches o\o,ot"the spindle g, spring n, socket 1. A torsion-spring for window-shaderolim., ,and shaftfe, Yprovided with an lfirm or proers, constructed with its coils of dit'erent dijection, s, substantially as and for the purpose ameters, as described, whereby the tension kof herein specified.

the spring is strengthened through n portion JOHN sHoREY.

ot' its length, substantially as and for the pur- VVitnesses: pose herein specified. GEORGE W. HUNTOON,

2. In a spring curtain-fixture, thecolnbina- LE ROY S. KIMBALL.

Images