US92491A - Improvement in machine for cutting bead-mitres - Google Patents

Description

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ROBERT F. TOM'PKINS, OF NEW YORK, N. Ya'

Letters Patent No. 92,491, dated July 13, V1869.

IMPROVEMENT IN MACHINE FOR CUTTING BEAD-MITRES.

The Schedule referred to in these Letters Patent and making part of the sameA To all whom it 'ma/y concern Be it known that I, ROBERT F. ToMrmNs, of the city, county, and State of New York, have invented a Machine for Cutting Bead-Mitres; and that the following description, taken in 'connection with the accompanying drawings, hereinafter. referred to, forms a full and exact specification of the same, wherein I havel set forth the nature and principles of my said limprovement, by which my invention may be distinshutters, blinds, doors&c.,where a beading runs along the edges of the wood used for the purpose, it is necessary,'in order to give a nished appearance to the work, that the beading should come together with a mitre; and to do this expeditiously and neatly not only requires a skilled workman, but considerable time.

By ,the use of my invention, however, vthis work may be done accurately and expeditiously by one of little skill, or even by a boy. A

In the accompanying drawings- Figure 1 represents afront side view;

Figure 2, a. rear side View of the same; and

Figure 3, a plan,l or top of my invention.

Similar letters of reference indicate like parts in the several drawings.

A is the bed-plate, upon. which the machine is Vproperly secured.

This bed-plate-'may beconstruct'ed of wood or castiron. I prefer to make it of wood, as itis both cheaper and lighter. 1 l

B is an upright castiron frame, standing at right angles to the bedfplate A, to which it is secured by the plates a a', cast in one piece with the frame B,

-and let into` the bed-plate A, flush with its upper surface.

The plates a a are irmly secured to the bed-plate A by the screws b b, with countersunk heads.

Sliding freely up and down on the rods or guides c c, is the cast-iron block (l, to which is bolted, or otherwise attached, the knife, or cutter D, by the tongue e.

-This knife, or cutter D may be made of cast-steel or of wrought-iron, with steel cutting-edges.

In the shape and construction of this knife, or cutter, lies the chief merit of my invention.

It will b e observed that this knife, or cutter has three distinct cutting-edges combined in one, viz, the project ing, or front' edge f, which is parallel with the upper surface of the bed-plate A, and the cutting-edges g g,

formed at angles offortyfive degrees with the front edge f. y

By reason of the peculiar shape of the knife, or cutter D, it will be observed that when a strip of moulding, or wood having a bead alongI its edge, is placed under the knife or cutter, with the beaded edge pressed closely against the fences It h, and the knife or cutter D is forced through the wood by the lever K, the edge fwill cut the moulding -or strip in a direction parallel with its length, whivle the edge g will, at the v same time, neatly cut the beading on the edge of the strip'to an angle of forty-tive degrees, or mit-re; and this operation may be repeated as often as maybe required, depending upon the length of mortise, or otherwise, as the workman may see tit.

If, at any time, the knife or lcutter D requires y l sharpening, it may be readily detached from the machine by simply loosening the setfscrew i, and then sharpening it the same as any other tool or iron would be sharpened.

The knife or cutter D is confined to its position by sliding between the projecting edges of the guideplates l Z, and the frame B.

The play of the knife between these guide-plates and frame maybe regulated by the set-screwsw 'ua As the, size of headings vary, I accommodate the action of the machine to thevarious sizes by means of the fences h h, which are projected to the front, thus exposing less cutting-surface of the knife where the beading is small, and rice frersa.

The ends of these fences next the knife or cutter are so constructed as to move always parallel with the edges g g. v

This is accomplished by means of the angular guides or slides m lm., and set-screws u n.

rlhc plates c a, besidesv securing the frame l5 to the `bed-plate A, answer the double purpose of keeping the bed-plate from wearing away at the cuttingpoint, andthus keeping the surface of the bed-plate exactly at right angles to the edges of the knife or cutter D.

As the moulding or strip may, in some instances, be thinner than at others, I regulate the throw of the knife by the screw p, which, when screwed inward,

shortens the .slot r, and thus leaves less play for the pin s, as is clearly shown in iig. 2.

, The bed-plate A has a depression, t, corresponding in shape and -size with the knife or cutter D, into which the knife or cutter is forced when passing through the moulding and bead, thus insuring a' clean cut, without burr. l

The lower ends of the rods .or guides c care fitted into the cross-bar j, which is cast into .the frame, and the upper ends pass through theupper part of the frame, nuts o o.

where they are secured by the I am aware of the patent granted to G. W. La. Baw,

dated 29th Mey, 1855, and I hereby disclaim his in` vention.

Having thus fully described nay-invention,

What I claim as new, and desire tosecure by Letters Patent, is

The knife or cutter D, adjustable fences hh, with the angular guides or slides 'm m,'fra.me B, guideplates ll, when all -are constructed and arranged to operate for the purposes hereinbefore set forth and described.

ROBERT F. TOMPKINS` Witnesses:

H. L. WATTENBERG, G. M. PLYMPTON.

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