US73653A - Samuel roebuck and john roebuck - Google Patents

Description

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SAMUEL ROEBUCK AND JOHN ROEBUGK, 0F NEW YORK, N. Y. Letters Patent No. 73,653, dated Jer/mary 21,1868.

'IMPRVEMENT IN PULLEY AND BLOCK.

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TO ALL WHOM IT MAY CONOERN:

` Be it known that we, SAMUEL Romanen and JOHN RonBucK, of the city, county, and State of New York,

have inventedanew and improved Pulley and Block; and we do hereby declare that the following is a full,

clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming a part of this specifica-tion, in which- Figure 1 is a front view of our improved pulley.

Figure 2 is a vertical cross-section of the same, the plane of section'being indicated by the line :v x, iig. l.

Similar letters of reference indicate corresponding parts.

This invention relates to a new device .for hanging window-shades, mosquito-canopies, and other light articles, and consists in so arranging the roller, around which the cord from which the said articles are suspended passes, and in so combining it with another roller above, that the said cord can, by moving its end to one side, be securely clamped between the two rollers, so that the articlesmay be retained in any desired position and at any desired elevation, and so that by moving the said cord towards' the centre again,'it may be released and the articles `be raised or lowered at will. The invention consists in making three grooves around that roller over which the cord passes. The centre groove is concentric, and when in it the cord is loose and cannot touch the upper roller. The two grooves on the sides are eccentric, and when the cord is brought into one of them, it is gradually raised until it is clamped between the upper and lower roller.

A represents a sheavebloclr 'of suitable construction. It may, for the purposes for which it is intended by us, be provided with a screw, a, or a hook, by which it may be secured in or suspended from a ceiling or some other stationary object. In its cheeks b bare the bearings for two rollers B and O. rllhe cord D, to which the article to bc suspended is fastened, passes over the roller B. In the circumference of the latter are formed three grooves. The'ccntre groovecis concentric withV the axis ofthe roller. The cord is in it when the article is being raised or lowered. On each side et' the centregroove is aspiral' eccentric groove, d, of which the lower end, or that end which is nearest' to the axis et' the roller, is of equaldepth with the groove c, aud is in connection with the same, as seen in tig. 1. From the point of connection with the groove e, the grooves Z gradually deviate from' tho same, iig. l, and also from the axis of the roller, igf, so that when 'the end of the cord is moved in an oblique directionto one side, it lwill be gradually brought 'into the groove cl, which is on that side of the groove c, and will be elevated toward the roller C, and he clamped between the same and the roller B, as

is clearly indicated in figs. 1 and 2.

We are aware th..t a patent was issued to J. E. Palmer, ofSt. Louis, Missouri, for so constructing a tackleblock and pulley that the rope, when desired, may be clamped between a fixed portion of the block anda portion`v of the pulley. It will be observed that in our devicey the cord is clamped between the two pulleys, as shown. We have found that when once clamped between the pulley and the block the cord could not be released with sucient ease or brought into the central groove, while, where two rollers are used, the pressure will belully as effective upon the cord as is necessary, and by pulling the cord back when clamped, so that the roller B will be revolved in the direction opposite to that in which it was turned while the cord was being clamped, the said cord will be easily released. Another advantage of our device over that of Palmer is that the cord will not be injured between the rollers, while it is subject to considerable wear when clamped between the roller and block.

Having thus described our invention, what we claimA as new, and desire to secure by Letters Patent, is

The block A, when combined with the rollers C and B, of which the latter is provided with concentric and eccentric grooves, substantially as and for the purpose herein shown and descnibed.

The above speciiicationcf our invention signed by us this v-day of May, 1867.

i SAMUEL ROEBUCK,

JOHN ROEBUGK.

Witnesses:

ALEX. F. Roannais, J. M. COVINGTON.

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