US92887A - Improvement in mitre-box - Google Patents

Description

Y dini-teil 15S/.taten @anni @imita MARVIN OWEN ROYCE,l OF BOSTON, MASSACHUSETTS.4

Leners Patent No. 92,887, daad .hay 2o, 1869.

To all whom tt may concern:

Be it known that I, MARVIN OWEN ROYCE, of Boston, Suffolk county, in the State of Massachusetts, have invented certain new and useful Improvements in Mitre-Boxes and their appurtenances; and- I hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawings, forming part of this specification.

'lhe nature of my invention consists in a traversing guiding-bar for the saw, fitted to traverse'in'a guiding-stand, and provided' with clamping-screws for straightening, stiifenng, holding, and guiding the saw, which bar may be made either with or Without a groove, for the back of the saw; also, in a guiding-stand, fitted and arranged to guide the above-mentioned bar, when it is Working with the saw.

In the accompanying drawings- Fi'gm'e l is a plan or top View of a mitre-box, with my improvements. I

Figure 2 is an elevation, with some of the parts shown in section.

A is a bed-piece, provided with ways, B B, at one edge, for the stands C C to traverse on, which stands may be fastened in the positiondesired, by set-screws D D. v

A cleat, like E, may be fastened to the under side of the bed-piece A, near each end, to support it.

lhe stand F mL y be made of cast-iron, in the form shown, or in such other form as will answer the purpose, and fasteied to the under side of the bed-piece A.

One end of the stand F may have a broad head to it, for the langeG of the horizontal plate H to t against; and the flange and both ends of =the stand are perforated for the bolt I, which fastens them t0- gether, and 'on which the flange turns, when the guiding-stand is inclined either way.

The horizontal plate H may be made in the form shown, and with a graduated circle on'its upper side,

with an index in the top plate J; or the graduated circle may be on the plate J, and the index K in the plate H, to enable the workman to set his mitre at the desired. angle horizontally..

And there is a curved plate, L, on the stand F,

- which is also graduated for the index M, on'the plate H, to enable the workman to set his'mitre vertically, as desired, andwhen set it may be fastened by turning the nut on the bolt I.

The top plate J has a ilange, R, across the top, upon which the lever N is placed, and a bolt, P, passes down through the lever, ange, and plates J and H, to makey a pivot for the plate J to turn on, and hold the plates together, y

The cam-lever Q is arranged on one end of the lever N, so that when it is raised it will loosen the bolt P,`

and allow-the plate J to turn on the plate H, to ad` just the mitre, and when adjusted, the -lever Q may be turned down to tighten and fasten the plate.

The flange R, and lever N and cam-lever Q, are shown in dotted lines in iig. 2.v

I make two bars, S S, with a recess onone side, and bolt their lower ends to the ange R, and bolt their upper ends to the blockl, shown by dotted lines in g."2, thus forming a guiding-stand for the saw which is to cut the mitre.

I make the bars S S so wide,- that the ribs on each side of the recesses will be far enough apartto prevent the saw from vibrating sidewise, as it is traversed through the stand, and avoid the need of a second4 guide in the opposite side ofthe stuff mitred.

To prepare a saw towork in my improved mitrebox, I take a bar of metal, U, and groove-one edge and perforate it for the bolts VvV, which are split at one end, to receive the back of the saw.

These bolts are made tapering or conical, so that when they are drawn into the bar,their split ends will be drawn against the saw W, and clamp it firmly, and straighten, stiffer, and. hold the saw, while the b ar U, tted to work between the bars S S, which prevent it from lswerving, and make it out the mitre propverly.

To use this mitre-box, it may be fastened to the benclnand a board laid or fastened on it, long enough to support the mouldings,.when the guiding-stand may be adjusted to .thee angle desired, and the holdingstands set, when it is ready for use. A

With my improvements, the saw is guided by the bar on the back, lso that the teeth of the saw never interfere with the guides, so as to wear or cut them away.

I claiml. The traversing guiding-bar U, provided with clamping-screws, substantially as described, for straightening, stiiening, holding, and guiding the saw, either'with or -without the groove in the bar.

2. The guiding-bar U, in combinationwi th the guiding-stand S, when arranged to operate substantially as described.l

. MARVIN OWEN ROYCE.

Witnesses J. DENNIS, Jr.,

WM. DENNIS.

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