US111269A - Improvement in steel glass-cutters and knives - Google Patents

Description

@eem eine THELESPHOBE SPNARD, OF COATIOOOKE, CANADA.

Leners Patent No. 111,26, dated January 24, 1871.

IMPROVEMENT IN STEEL GLASS-CUTT'ERS AND KNIVES.

The Schedule referred to in these Letters Patent and making part of the same.

To all 'whom it may concern:

Be it known that I, IHnnnsrnonn SPNARD, of the village of Coaticooke, 4in! the district of St. Francis, in theProvince of Quebec, Canada, jeweller, have invented a new and useful Steel Glass-cutter Knife and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the saine, reference being had to the annexed drawing, i'vhere- Y Figure vI represents side elevation of knife with cut- Jcer attached.

Figure II represents an enlarged section of knife with cutter.

Figure III represents au enlarged end view of knife with cutter attached.

The object of this invention is to produce afsteel glass-cutter in connection with an ordinary pocketknife, and which will be simple, cheap, and effective.

In the cutting of glass a diamond is usually employed, but as this process necessitates a special in-' struinent, it is frequently impossible on ordinary occa-l sions for persons to avail themselves of its use.

Steel instruments for cutting glass have also been in use, but the saine objection as to special instruments obtains. This will be removed 'byniyinvcntioin attached as it is, in a simple manner, toa common instrument in general use, like apocket-knife.

Thiscutting steel is arranged in the form of a small circular disk or Wheel, with its outer sides beveled to a sharp cutting-edge.

A slot is provided in the metal end of the knife, into which the steel wheel is introduced, being held in place and revolving on an axle passing through the wheel into each side of the metal.

This vcutting-wheel is made of finely-tempered steel.l

In the drawing similar letters of reference indicate corresponding parts.

a is t'he knife, of any of the ordinary forms in use; and

b, the revolving steel for cutting the glass, with beveled edges c and sharp cutting-edges (I.

e is the slot or recess cut out of the metal end fof the knife a, and p g, the axle on which the Wheel revolves.

Ihe plan of operation is as follows:

The glass to he cut is placed on a iirin level table, or bearing, and a straight-edge or other guide for the line of cutting placed in the required position on the glass. lhe knife is then taken in the right hand and with the revolviiig steel Wheel' resting on the glass, and guided by the straight-edge, 85e., is drawn iirml y over the glass Vin the required direction, the sharp revol ving edge of the cutter in contact with the glass, will operate like a diamond, and leave the glass in such a condition that it can be easily broken iu the line traversed by the cutter. A leading advantage possessedv by this form of cutter is that its entire circumference acts as a cutting point, and will therefore last much longer than the ordinary single-pointed cutter.

That I claim as mv invention and wish secured,

M.- K. STONE, EDWIN VAUGHAN

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