US257400A - Tool-holder - Google Patents

Description

(No Model.) Y

N. H. SNIDER.

i TOOL HOLDER. No. 257,400. 'Patented May 2,1882.

wnesses. QYWEWEOL* 4,7 Mja UNITED STATES PATENT OFFICE.

NICHOLAS H. SNIDER, OF PITTSBURG, PENNSYLVANIA.'

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 257,400, dated May 2, 1882. Application filed January 9, 1882. (No model.)

To all whom it may concern.:

Be it known that I, NICHOLAS H. SNIDER,

of Pittsburg, in the county ot' Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Tools for Dressing Grindstones; and I do hereby declare the following to be a full, clear, and exact description thereof.

The grinding-faces of grindstones have heretofore been dressed or finished in the following manner: The stone, having been previously cut to the general shape required, is mounted upon a revolving shaft in a suitable frame. The tool used to dress the face is a ilatrectan gular strip of steel otsufticien t length to be held, and from iive-eighths of an inch to two inches wide. This tool or bit has been secured in a box or holder by means of a setscrew, with one end projecting from the box .about one-quarterot' Van inch, and the holder rested upon the cross-timber of the grindstone frame or housing, and presented to the swiftly-revolving face of the grindstone in the same manlief as the tool of the turner is presented tothe work on his lathe. The hard granular surface of the stone wears the steel bit of the tool off very rapidly, and then it has to be advanced in its holder. This neccssitates the cessation of the work, the unscrewing of the set-screw, and the advancing of the bit. 'As this operation is a frequent and comparatively a slow one, the loss ot" time and power is considerable.

My invention consistsin an improved holder which enables me to make the adjustment with ease and quickness and obviates the use of a clamping-screw.

To enable others skilled in the art to make and use my invention, I will now describe it by reference to the accompanying drawings, in Which Figure 1 is a side view, partly in section, of my improved holder, and illustrates the manner of inserting and adjusting the bit.. Fig. 2 is alike view, showing the holder closed on the bit; and Fig. 3 is a front end view.

Like letters of reference indicate like parts in each.

The holder is composed of a lia-t bar or body, a, having two perforated lugs, b, one on each side, a rest, c, on the under side, and a handle, d, at the back end. Pivoted to and between the lugs is an eccentric or jaw, e, havsay, one-quarter of an inch. To insert the bit f the handle e2 is thrown up, as in Fig. l, un til the eccentricity c of the part e is turned out of the path ofthe bit. Then the bit isinserted and the handle c2 is brought down onto thehandle d. This causes the eccentric e to bite on and clamp the bitfrmly in the holder. Y

Then it is desired to adjust the bit the handle c2 is thrown up and the bit drawn 0ntward. In use the projection-c is placed on the cross-bar of the grindstone-frame in front ofthe stone, and the holder is grasped in the hand and presented to the face of the stone which is to be dressedin the usual way.

My improved holder is efcient, simple, and cheap, and its use effects asaving of time and power.

I am aware that an eccentric has heretofore been employed to clamp a tool to its holder, and do not herein claim the same;V but lVhat I claim as my invention, and desire to secure by Letters Patent, ist 1. A bit handle or holder for giindstonedressers, said handle consisting ot' a bed or rest for the bit, in combination with an eccelltric pivoted on the bed and adapted to clamp the bit to the saine, the bed or rest and the eccentric being provided with handles adapted to be brought together or parallel when the bit is held by the eccentric, substantially as specified.

2. In a bit-holder for grindstonedressers, the combination ot' the bedor rest a, having the handle d, and provided with lugs at its forward end, and the eccentric e, pivoted between the lugs on the forward end ot' the bedl and provided with handle e?, substantially as and tor the purpose specified.

In testimony whereof I have hereunto set my hand this 4th day of January, A. 13.1882.

NICHOLAS H. SNIDER.

Witnesses:

T. AB. KEER, J AMES H. PORTE.

IOO

Images