US672050A - Ball-bearing shears. - Google Patents

Description

Patented Apr. I6, I90I.

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UNITED STATES PATENT OEE-ICE.

LEROY A. WILLIAMSON, OF WEST CORNWALL, CONNECTICUT.

-BALL-BEARING SHEAIRS.

SPECIFICATION forming; part of Letters Patent No. 672,050, dated April 16, 1901.

Application mea July 5.1900.

To all whom, t may oon/cern:

Be it known that I, LEROY-A. WILLIAMSON, a citizen of the United States of America, having residence and post-office address at West Cornwall, in the county of Litchfield and State of Connecticut, have invented a certain new and useful Improvement in Ball-Bearing- Shears, of which the following is a description, reference being had to the accompanying drawings, wherein- 1 Figure ,l is a side view of a pair of shears embodying the said improvement. Fig. 2 is a view of the same shears in cross-section on the plane denoted by the dotted line :r of Fig. 1, the scale being enlarged as compared with Fig. l. Fig.`3 is a side view, ona scale similar to that of Fig. 2, of a portion of the shear-half which is next the observer in Fig. l with the pivot-screw absent. Fig. 4c is a view, on a scale similar -to that of Fig. 2, of a portion of the inner face of that shear-half which is underneath in Fig. 2 with the pivotscrew absent.

The object of the improvement is the production of ball-bearing shears.

In the accompanying drawings the letter a denotes one of the shear-halves, b denotes an interiorly-screw-threaded pivot-hole through the same, c denotes a ball-race surrounding said pivot-hole, and d denotes the balls contained therein. By preference the pivot-hole andvball-race just referred to are made in a piece separate from the shear-half, which piece is tightly forced into a correspondinglyshaped orifice in that shear-half. The letter e denotes the other shear-half, and e denotes an interiorly-screw-threaded pivot-plate hole therein.

The letter f denotes the eXteriorly-screwthreaded pivot-plate which screws into the hole e', it being provided with Spanner-mortises f for that purpose. The pivot-plate f contains the Unthreaded pivot-hole f2, and it also contains the larger ball-race g, surrounding the outer end of the same. The ball-race is sunken considerably below the outer sur face of the pivot-plate in order to give place for the head of the pivot-screw h. The pivotscrew is threaded into the shear-half a and holds the two shear-halves together and, as

Serial No. 22,567. (No model.)

its name indicates, is the pivot on which they turn. The under side of the head of that screw bears upon the balls i which are contained in the ball-race g. The inner side of the pivot-plate hasa surface which bears upon the balls d.

The closeness of fit of the two shear-halves to each other is determined by adjusting the `pivot-plate in the pivot-plate hole.

It claim as my improvementl. In combination; the shear-half having the screw-threaded pivot-hole and the ballrace surrounding the said pivot-hole; the balls carried in the ball-race last mentioned; the other shear-half having the screw-threaded pivot-plate hole; the eXteriorly-threaded pivot-plate having the sunken ball-race, the unthreaded pivot-hole, and the surface adapted to bear on the balls iirst mentioned; the balls carried in said sunken ball-race; and the headed screw having its tip threaded into the threaded pivot-hole in said rst-mentioned shear-half and its body loosely iitting said unthreaded pivot-hole and bearing by the under side of its head on the balls last mentioned; all substantially as described and for the purposes set forth.

2. In combination; the shear-half having the screwthreaded pivot hole; the piece forced into said shear-half and having the unthrea'ded pivot-hole and the ball-race surrounding the said pivot-hole; the balls carried in the ball-race last mentioned; the other shear-half havingthe screw-threaded pivotplate hole; the exteriorly threaded pivotplate having the sunken ball-race, the unthreaded pivot-hole, and the surface adapted to bear on the balls first mentioned; the balls carried in said sunken ball-race; and the headed screw having its tip threaded into the threaded pivot-hole in said Iirst-mentioned shear-half and its body loosely fitting said unthreaded pivot-holes and bearing by the under side of its head on the balls last mentioned; all substantially as described and for the purpose set forth.

LEROY A. WILLIAMSON. Witnesses:

WILLIAM D. BosLER, KATHRINE N. SALEWSKI.

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