USRE6822E - Improvement in pulleys - Google Patents

Description

R. W. BETTS 80 W. HOWIE.

PULLEY. No. 6,822. Reissued Dec. 28,1876.

vot' a pulley to accomplish the object aforesaid.

I the roller may be brought near to the surface UNITED STATES PATENT OFFICE;

ROBERT W. BETTS AND'wiLLrAM HQWIE, or BROOKLYN, new YORK.

IMPROVEMENT m PuLLEvs I Specification forming part of Letters Patent No. 168,708, dated October 11, 1875; reissue No. 6,822, dated December 28, 1615;- application filed December 1, 1875.

surface of the pulley or the paper, or both, the covering can be applied by merely turn- To all whom it may concern:

Be it known that we, ROBERT W. BETTS and WILLIAM HOWIE, both'of Brooklyn,'in the countyof Kings'and State of New York, have invented an Improvement in Pulleys; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part hereof, in which- Figure 1 is a side view-0t a pulley constructed according to our invention, and Fig. 2 is a centraltransverse section of the same.

The object of our invention is to increase the friction of the belt npon the drawingsurface of the pulley, to augment the drivingpower of the belt, and keep it from slipping; and our invention consists of a facing of paper, cemented or glued to the drawing-surface the roller and pulley. The paper may, of

or more thicknesses of it may be applied, and almost any variety of paper may be used, though it should not be'too thick. It is better to apply two, or even three, thicknesses of thin paper than one that is too thick and soft, that willl chafe or tear under the belt. Two thicknesses of common straw-board, of ordinarythickness, answera very good purpose. It is cheap, and gives great power to the belt upon the pulley.-

The preparation of the-surface of the pul- 'ley may be dispensed with, provided a good marine glue or cement be used, and so may the preparatibn of the paper. 'Neither of them is absolutelyessential to the success of the invention, though we" think it better to prepare both the pulley and the paper; but neither is essential if the right kind of cement an d paper be used.

Thedrawing shows'a pulley covered after the plan of our invention, the essence of which is a facing or covering of paper cemented or glued upon the drawing-surface of a pulley, to increase the drawing power of the belt.

-We claim, therefore, as our invention, and desire to secure by Letters Patent- A facing or covering of paper, applied, cemerited, or glued to the drawing-surface of a pulley, forthe purposeof keepingit from slip:

ping andjncreasing its drivingpower.

R. w. BETTS. WILLIAM HOWIE.

In practicing our invention we proceed as follows: We first coat the drawing-surface of the pulley with a mixture of whitelead, borax, and oil, and allow it to dry. We then wet the paper with a solution of sal-ammoniae. and water, and allow it to dry. We then out the .paper in strips of the proper width and length, and coat one side of itfwith a strong adhesive cement or glue, and apply it to the surface of the pulley The best way to apply the paper is to have the pulley on a mandrel or shaft arranged to revolve about its own axis, and then have a roller on a separate shaft arranged onpthe same plane with the. axis of the pulley, the surface of the roller being made to match the surface of the pulley, and its centers to be set in adjustable bearings, that the surface of Witnesses:

HENRY J Warns, T. JOSEPH HrLeEe.

of the pulley, leaving justroom enough for the paper to pass between the two; then, if the cement or glue be applied to either the in g the pulley and feeding the paper between course, be cut in one ormore strips, and one

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