US826587A - Scissors. - Google Patents

Description

PATENTED JULY 24, 1906. T. S. LINSGOTT.

SGISSORS APPLICATION II'LED 00127, 1906.

INVENTOR. We 6.,d 1706005;

A T RNE 1 ,5,

WITNESSES:

- UNITED STATES PATENT OFFICE.

THOMAS S. LINSCOTT, OF BRANTFORD, CANADA.

SCISSORS.

Specification of Letters Patent.

Patented July 24, 1906.

Application filed October 2'7, 1905. Serial No. 284,732.

hereinafter more specifically described and then definitely claimed.

Figure 1 is a plan view of a pair of scissors constructed in accordance with my invention. Fig. 2 is a plan view of part of one of the blades. Fig. 3 is an exaggerated longitudinal section of a portion of a pair of scissors.

In the drawings like letters of reference indicate corresponding parts in the different figures.

In their main features the scissors are the same as those of ordinary construction and comprise the blades A and B, provided with the usual handles. The blades are connected by a pivot-bolt C, which is screwed into the blade A and preferably at its end slightly riveted or otherwise held from turning. This bolt passes through the blade B, the blade being free to turn on the bolt and also free to move up and down. Around the pivot-bolt a ball-race D is formed between the two blades, half being on one blade and half on the other, though the groove 'might be wholly in one blade. Within this race are arranged a series of balls E, forming a ballbearing between the blades of the scissors. The pivot-bolt has a head F formed thereon a short distance above the blade B.

A lever-spring G is bent substantially as shown, its lower end H being connected with the upper end I by means of an upwardlyinclined portion J, the result being that a fulcrum or hearing is formed at the point a in contact with the blade B. The bolt 0 extends through the part H, the latter engaging the under side of the head. Through the part I passes the stem of a tension-screw K, the stelrgn of the screw being threaded into the blade From this construction it follows that by adjusting the tension-screw K the spring G may be caused to exert a greater or lesser spring leverage between the blade B and the head F of the bolt. The blades of the shears are thus held with their blades in operative position by a spring tension, which results in their operating properly under all conditions and which permits of any wear being taken up at any time.

The ball-bearings cause the shears to operate with case no matter how hard the work may be on which they are employed and, further, obviate the wear which usually takes place on the pivots of ordinary shears or scissors.

The spring is important not only on account of its effect in holding the blades of the shears in proper position as far as their cutting edges are concerned, but also important in holding in operative position the parts of the ball-race formed between the blades of the shears, all lost motion in the ball-bearing being thus avoided and wear taken up Whenever it occurs.

These shears will be found to be superior in all respects to those provided with ordinary pivots, and the style of spring tension employed will be found to admit of easy, accurate, and fine adjustment.

What I claim as my invention is- In scissors or shears a pivot-bolt secured to one blade and extending loosely through a hole in the other a head on the bolt; a bent spring-lever of the first order having a bearing or fulcrum on the blade adjacent to the head and engaging with one end the under side of the latter; and a tension-screw tapped into the blade and engaging the other end of the lever-spring to regulate its tension, substantially as described.

THOMAS S. LINSCOTT.

Witnesses:

j J. M. N Es's,

E. M. Lnvsoo'r'r.

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