Improvement in belt-tighteners
US 148808 A
Description (OCR text may contain errors)
Patented March 24,1874.
UNITED STATES ATENT GEEIGE.
WrILLlAM B. (ELEVES, OF SAVANNAH, GEORGIA.
IMPROVEMENT IN BELT-TIGHTENERS.
Specification forming part of Letters Patent No. 1L1,80S, dated March 24, 17874; application filed May 17, 1873.
To all whom it may concern:
Be it known that I, WILLIAM B. GLEvEs, of Savannah, in the county of Chatham and State of Georgia, have invented a new and useful Improvement in Belt Tightener, of which the following is a specication:
Figure l is a sectional view of my improved belt-tightener, taken through the line x x, Fig. 2. Fig. 2 is a top view of the same.
Similar letters of reference indicate corresponding parts.
My invention has for its object to furnish an improved belt-tightener designed especially for sewing-machine belts, which shall be simple in construction and convenient in use, enabling the belt to be readily tightened or slackened, as may be required. The invention consists in the belt-tightener formed by the combination of the base-plate, the pivoted arm, the concaved roller, and the hand-screw with each other, as hereinafter fully described.
A is a circular plate, which is made with an upwardly-proj ecting dan ge, a', three-eighths of an inch (more or less) in depth. The nange a is designed to enable the plate to be attached to the under side of the table of those sewingmachines in which the machine is secured to the table by bolts and nuts. Upon the plate A is formed an arm, B, which is notched or slotted, or has lugs formed upon it, to which is pivoted an arm, C, to lugs formed upon thc outer end of which is pivoted the journals of a roller, D. The face of the roller D is concaved, as shown, to prevent the belt from running off the pulley when pressure is applied toit. rlhe outer end of the arm B projects beyond the pivoting-point of the arm C, and has a screw-hole formed in it, to receive the hand-screw E, the rounded forward end of which rests against the pivoted arm C, so that by turning the screw E in, the arm U will be forced forward, pressing the roller D against A WILLIAM B. cLEvEs.
W. H. DooNEn, F. G. RYAN.