US71670A - Improvement in gutter-head for mouldings - Google Patents

Description

.@tfatrs a'trnt ffitr..

JOHN WHITWORTH, OF OLEVELANDQOHIO, ASSIGNOR -TO HIMSELF AND W. H.'HAWKINS, OF SAME PLACE.'

Letters Patent No. 71,670, dated December 3, 1867.

tite Stigehnle maar tu in time ette'rs minut :mt mating wat nf tige same.

To ALL WHOM 1T MAY coNoERN: Y.

Be it known that I, JOHN WHITWORCEII, of Cleveland, in the county of .Onyahogaand State of Ohio, have invented certain new and useful Improvements in Cutter-Head for Mouldings; and I do hereby declare that the following is a full and complete description ofthe same, reference being had to the accompanying drawings, making a part of this specication, in which- Figure lis a view of the under side of the cutter.

Figure 2 is a view of the edge,

Figure 3, a view showing the position of the cutter in relation to its Work.

Figures 4, 5, 6, and 7 represent acutter of different form.

Likeletters of reference refer to like parts in the different views.

Fig. 1 represents a chilled cast-iron cutter, for cutting beads, mouldings, 3&0., for picture-frames,ornamental work, or for any like purposes for which mouldings are ordinarily used, and which may be of any size and style required. Cutters in common use for this purpose are made of steel, nished up and tempered with great skill and care, in order to obtain a fine and durable cutting-edge. Notwithstanding the care and skill exercised, the cutters very soon become dull, making the work rough, and more especially so when the timber is hard, curled, or knotty. The time and labor necessarily spent in repairing and fitting those worn cutters render 'them not only expensive, but, in consequence of their being so frequently sharpened, the work becomes irregular in size, and the mouldings -not comparable, and variable in shape. In order to avoid this ditliculty, labor,'and expense, the cutter is made of chilled cast \iron, which experience has shown can be wrought to a ine cutting-edge, lasting very much longer than steel, and considerably less expensive. Steel cutters require dressing every few hours, while the chilled cutters not more than once in tive or six days. i

The manner of making vthese cutters 'is by simply forming a pattern of the size and style of mouldin required, and casting them 'in chills, which are then ground on stones, and emery-whcels constructed for thev purpose. The vchills are so constructed that the bias of the cutting-edge falls back from theedge, thereby throwing the chips o' from the work or timber to one side, as it'passes along under the cutter, instead of down upon it, as do the cutters now in ordinary use. Fig. 3 shows the position of the cutter while in use, A being the cutter, and B the moulding or timber. t

These cutters are sharpened by dressing or grinding the bias or angle of the cutting-edge C, thus leaving the curves of the mould unchanged; hence, as the cutting-,edge may back, it still retains its first size and form.

Fig. 5 shows the cutter with the angle ot" the receding from the cutting-edge, which is preferred, and will therefore throw the chips in the direction of the dotted line a, whereas the bias of theangle of the cutter A, iig. I, is the reverse, and hence will throw the chips from the opposite side from that of g. 5, and-of which figure iig. 4 i-s a side view. y

What I claim as my improvement, and desire to secure by Letters Patent, is

The herein-described chilled cast-iron cutter, .made in the manner as and for the-purpose substantially set forth, as a new article of manufacture.

JOHN WHITWORTH. Witnesses:

W. H. BRRIDGE,

FRANK S. ALBEN.

Images