US277883A - Tool-holder for grindstones - Google Patents

Description

(NoModeL) v J. I. CARE.

TOOL HOLDER FOR GRINDS'IONES.

No. 277,883. Patented May 22,1883.

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JOHN I. CARE, OF CHICAGO, ILLINOIS,ASSIGNOR TO LAWRENCE W. TATUM, OF CLEVELAND, OHIO.

TOOL-HOLDER FOR-GRINDSTONES.

SPECIFICATION formingpart of Letters Patent No. 277,883, dated May 22, 1883,,

Application filed March 19,1883. (No model.)

To all whom it may concern Beitknown that l,JOHNI.(JARR,ofChTcago, in the county ofCook and State of Illinois, have invented certain new and useful Improvements in Tool-Holders for Grindstones, of which the following, in connection with the accompanying drawings, is a specification.

In the drawings, Figure 1 is a side view of a tool-holder embodying my invention. Fig.

2 is a top view of the same. Fig. 3 is a section in theplane of the line no 00 of Fig. 1, viewed in the direction indicated by the arrow there shown; and Fig. 4 is a front view, in detail, of the standard. I

I5 Like letters of reference indicate like parts.

A represents a grindstone, and B is the grindstone-frame.

C is a standard applied to the frame B.-

D D are grooves or recesses in that face of the standard which is toward the grindstone.

E E are holes passing rearward through the grooved parts of the standard. The backs or inner or vertical faces of the grooves D D,

are curved or bowed outwardly, asindicated. 2 F is a curved arm or lever, terminating, by preference, at its forward end in a handle, F. The rear end of the arm F has thereon a fiat and comparatively broad part, (1, having a curved edge, a,- and a is a small tongue pro- 50 jectin g from the edge a. G is a plate or table on the forward part of the arm F,'and G is an arch or bridge on the plate G.

Hisasetscrew passingthrough the bridge G. I is a tool clamped between the plateGand its bridge by means of the screw I. I cast thearm F, the plate G, and bridge G all in one piece or member.

To use this holder I pass the tongue a 40 through one of the holes E E--f0r example, through the central hole-as shown in Fig. 1. The part a fits nicely, but not tightly, in the central groove, D, so that the arm F will he firmly supported over the grindstone. The tongue a passes loosely through the central hole, E. I then arrange and bind the tool as shownand turn the grindstone. By bearing gently down upon the handle F the edge of the tool will press sufficiently against the 0 stone, and will be so inclined that a beveled edge will be ground.

While the tool is being ground it may be moved back and forth sidewise by swinging or moving the arm F laterally,thearin turningin the standard C. To prevent the arm F from being accidentally drawn from the standard, I pass a small pin, 0, into a hole in the tongue a. I make the plate G broad enough to permit the tool to be set at angle therein, so that an angling edge may also be ground.

In practice tools have cutting-edges which differ in the slope of the bevel. To adapt my tool-holder to this circumstance I make a number of grooves. I) D, in the standard C, and these grooves increase regularly in height or between their upper and lower surfaces, the

highest and lowest grooves being largest, measured between the said surfaces, and these measurements decreasing until the central groove is reached, which neatly fits the plate or part a, as before stated, all ofwhich is clearly represented in Figs. 1 and 4. By this means the arm F, and consequently the tool, will be tilted to a greater or less degree with relation to the stone, and the bevel on the cuttingedge will therefore be more orless broad, as may be desired, and the tool will at all times be retained at the inclination necessary for grinding it to the bevel to be produced. These grooves I intend to number, so that each groove, after alittle practice, will easily become associated in the mind of the operator with a bevel having a corresponding slope, and so that, wishing to produce a particular bevel, he will know in what groove to place the arm F in order to accomplish his purpose. I

Having thus described my invention, what I claim as new,anddesire to secure by Letters Patent, is-

The combination, substantially as specified, of the arm or lever F with its bridged table or plate G G thereon near its forward end,

the screw H, entering the said bridge, and the

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