US119568A - Improvement in curtain-fixtures - Google Patents

Description

WILLlAM N. BULKLEY- Improvement inv Curtain Fixtures.A

No. 119,568. Patentedoct. 3,1871.

UNITED STATES PATENT QFFCE.

WILLIAM N.Y BULKLEY, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN CURTAIN-'FIXTURES Specification forming part of Letters Patent No. 119,568, dated October 3, 1871.

To all whom t may concern:

Be it known that I, WILLIAM N. BULKLEY, of Brooklyn, in the county 0I' Kingsand State of New York, hve invented certain Improvements in Automatic Drop -Itollers for Window- Shades, of which the following specification is a description.

The object of my invention is to construct a windowl shade in such manner that it will be selfacting (by means of a selfgoverning friction pressure) in covering any desired portion of, or the whole of, a window, and remain in any desired position, as represented in the accompanying drawing, of which- Figure I is a front elevation of my invention; Fig. 2, vertical section on line a: w, Fig. 1; Fig. 3, an end view of shade-roller, showing pulleyratchet and pawl; Fig. 4, a detached view of hollow cylinder-head and pulley. Fig. 5, a section on y y of Fig. 3, showing conical pulley, rotating screw, traveling nut, and pressure-spring, Fig. 6, a section on z z of Fig. 5 Fig. 7, a section on c c, Fig. 5, looking toward the left; and Fig. 8, a section on said line looking toward the right hand.

In the said drawing, A is a metallic or other cylindrical roller, to which the end of the Windowshade B is attached, said cylinder receiving in one or both of its ends a hollow cylinder-head, C, which rotates with the shade-cylinder. The interior of the cylinder-head is a hollow square, D, extending nearly its whole length, and receives a rotating screw-shaft, E, traveling-nut F, spiral pressure-spring Gr, and in its outer end a tixed partition, c', and conical friction-pulley H. On the outer end of said screw-'shaft is a ratchet-wheel, I, and also the loose driving-pulley K, while on the end of the cone-pulley is another ratchet-wheel, L, one 'being set reverse to the other. The pawl K on the loose drivingpulley acts on the friction-ratchet L, attached to the cone friction-pulley, to roll the shade while the roll is descending. The pawl M on the suspension guide-plate N acts on the saine ratchet L to assist in preventing rotation of the frictionpulley while the shade is being unrolled by hand. rlhe reverse-ratchet I on the outer end of the shaft E, together with the reversed double pawl I', is employed to revolve the screw-shaft within the spring-compressing nut F, for the purpose of easing the pressure ofthe spring on the conical friction-pulley while the shade is being raised to any desired position, said friction being only requisite to hold the weight of the shade while it is unrolled, the maximum pressure of the spring' being at this point, while the minimum pressure of said spring acts only when the shade is all rolled up, thus creating a self-regulating frictionpressure on the conical friction-pulley by means of the pressure of the ratchet-wheel I against the sleeve or bushing Oon the end of the-screwshaft, for the purpose of easily operating' the shade and obviating friction when not required. The pulley-brackets for suspending the windowshade roller (by the double suspension-cord W) are so constructed as to be applicable to the in-' side of the window-casing, as shown in the drawing, and are composed of swing-brackets P I,.

each having a cylinder, Q, for reception of a spiral tension-spring, R, for the driving-cord and a cord-pulley, S, the parts being held together by a screw-journal, T, the cord-holder U or catch to which the other end of the driving-cord V is attached (having one whole turn around the driving-pulley) being also adapted to the inside casing of the window-frame, with no interfering projection, the construction of said iixtures throughout preventing contact of the edge of the shade with any of the working parts.

What I claim isl. The double pawl K, single pawl lVl,y ratchetA CHARLES E. MARSHALL. (35)

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