US476045A - Miter-cutter - Google Patents

Description

Nb Model.) 2Sheets8h et 1.

'W. R. FOX. MITER CUTTER. No. 476,045. Patented May 31, 1892. 59

(No Model.) r -2 Sheets-Sheet 2. W. R. POX.

' MITBR CUTTER- No. 476,045. Patented May 31, 1892.

UNITED STATES PATENT OFFICE.

WVILLIAM R. FOX, OF GRAND RAPIDS, MICHIGAN.

MlTER-CUTTER.

SPECIFICATION forming part of Letters Patent No. 476,045, dated May 31, 1892.

Application filed August 20, 1891. Serial No. 403,256. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM R. FOX, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Miter-Cutters, of which the following is a specification.

The class of miter-cutters to which my invention pertains is that in which there is a movable wing or gage against which the material is held in cutting and the inner edge of which is maintained in a plane parallel with and near the plane in which the edge of the knife moves in the cutting, the inner or front end of the gage being free and supported laterally against the pressure of the knife upon a vertical post.

which my invention pertains is shown in Letters Patent of the United States granted me on the 4th day of December, 1888,N0. 393,970.

In the patent above mentioned, as in other forms of machines heretofore made by me, the outer or rear end of the gage is supported in a slot by means of a set screw or clamp, the slot being part of a circle struck from a center at or near the angle formed by' the plane of the post and the plane of the knife-edge, the slot being sufficiently large to allow free movement of the gage, but not serving as a guide, the position of the supporting or shearing edge of the gage at the front end being in the machines above referred to and heretofore made determined by connections at the front end of the gage.

The object of my invention herein set forth is to dispense with the connections at the front end of the gage, except that of the lateral supporting-post, and to guide the gage in its various adjustments by means of the supporting-post and the slot with its gage connections.

My invention consists in combining with the lateral support to take up the pressure of the knife at the inner end of the gage witha special form of curved slot and gage connections therewith, by means of which the slot and its gage connections therewith will main tain the shearing-edge of the gage always in the same plane and in the same relation to the plane of the out.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is a plan View of the cutter-bed, showing the gage in horizontal section. Fig. 2 is a section on line w a: of Fig. 1. Fig. 3 is a plan view illustrating one mode of forming the slot. Fig. 4 is a diagram illustrating the method of laying off the slot.

In the drawings, A represents the bed of the machine, and B the posts. These posts and the gages which bear upon them are ordinarily in duplicate; but it is sufficient to describe the mechanism at one end only.

The gage is shown at A. The shearingedge, or the edge which maintains its position in the plane parallel with or near the cutting-edge of the knife, is shown at 4, and the edge which bears against face of the post B is shown at 1. These edges are the Vertical corners of the inner end of the gage, which is rectangular in cross-section. The bearingface of the post is shown at right angles to the plane in which the knife-edge moves in cutting. As the knife moves in cutting at this end directly against the wood lying against the face of the gage, the pressure is brought directly against the bearing-face of the post. The gage is shown in Fig. 1 with its bearing-face for the wood, which is to be cut at right angles to the plane of movement of the knife-edge in full lines.

The dotted lines show the gage in position at various angles less than a right angle. It will be apparent that if a circle for the slot 3 were struck from the corners 4 in the position shown in full lines and the clamp which holds the rear end of the gage to the slot were closely fitting the'corner 1 would move away from the bearing-post as the gage was turned from a right angle, and the front end of the gage would have no support. On the other hand, if the circle for the slot were struck from the point 1 under the same conditions the point 4 would swing forward over the line of cut; but itwill be observed that if the gage be turned from the position shown in fully lines in Fig. 1;, where it is at right angles to the plane of the cut, and supposing the end 4 of the gage to be supported by a plane surface coincident with the plane of the cut or parallel therewith and supported also by the post, the gage being held to the post as it turns, the point 4 will slide on its bearing-surface toward the post until when the gage is brought with its bearing-face against the plane of the cut the point 4 will be brought into contact with the post, and will then occupy the position of the corner I in the full lines. have devised is one which has its bearing face or facesthat is to say, the edge or edges of the slot-on. a curve the parts of which are successively equidistant from points success.- ively taken between the extreme bearingpoint 4 and 1 of the corners of the gage or bearing-points whenthe gage standsat right angles, as shown in Fig, 1.

To illustrate the formof slot morefully, and also to explain how it may be made, I refer to. the-diagram shown in Fig. 4. The line 4; y is supposed to indicate the position of the bearing-face of the gage when it is at right angles to the line of cut. Thecurved slot is shown at S. T indicates the block fitted to move snugly in it, bearing against.

the wallsof theslot. Let the line 4ybe sup.- posed to be six. inches. It will indicate the distancebetween the outer end of. the curve andgthepoint 4,, where the shearing-edge c0- incides with theplane on which that-point is tobeheld. I then subdivide the-line 4 to 1 intoanequal number of partsfor example, ten,.the subdivisions being indicated by marks aha d, & c. Then I turn the gage, keeping it in contact with the post on. the left-hand side until the corner 4 coincides withthepoint a, the first point of the subdivision. of. the bearing-face of the gage six inches from the point a a, will indicate, ther.efore, the margin. of the curve S. In the. same manner I shift thecorner 4. to the next point I). and in the same manner lay. off the line b b, six. inches in length. Ina similar manner I turn the gage, keeping its right-hand side bearing against the post until Ihave indicated'acurve long enough to give the re quired sweep to thegageanda-curve drawn throughthe line y a b, &c., to ,z-will indicate the form of the curve to be made. The curve, if continued to the line 1 z, wouldbe at;- the point where it strikes thatline, six inches distantfrom the pointl. Practically itis notnecj essary toextend the curve to thatpoint; but l theslot in practice islaid off onacurve the outer end of whichisthe same distance from apoint where aline on the bearing-face of the-gage at right angles to the line of cut crosses. said. line of: cut, as the point where the inner end ofthe curve crosses the line of cut is from the point where the plane of the The slot therefore which If Thena. point a, laid off ontheline.

bearing-face of the post crosses the line of the cut, and the intermediate parts of the curve taken from the outer to the inner end are successively equidistant from the point taken in the same order and degree of succession from. the point where the line of cut crosses the plane of the bearing-face of the post.

In the practical manufacture of my improved gage I mill the curve in the bed by means of the apparatus illustrated in Fig. 3. The bearing-face of the post B is finished and a. bearing on: the front is formed temporarily by means of a bar or plate of steel E,

fixed between the carriage and the gage of .thesame thickness as the knif,e,,so that the face of: it, will be in the, same plane in .whichthe shearing-edge of the gage is to be ,jheld. The-tool consists of amilling-tool D, :Icarried-i-n an. arm (J, the front end of. which ;is of the same dimensions i'nshori zontal plane ;.as the front end. of the gage. It corresponds in shape to the gage on thesidesand; ends. In the rear end. of this bar is the mill- .ing-tool D, which is rotated by any suitable .imechanisimand. the bar is turned the outer .end moving from left to right and the inner T end kept firmly against the post and'thebar .E while the milling-tool is operated; This fcutsthe slot upon the principle and in the form above described. Since this slot and I the connections therein serve not only, to hold the gage in positionwhenit has been. set in proper position, but also to guide ity to the proper. position. and to maintain the shear- ;ing-corner 4 always inthe plane of" the cut or in aplane parallel therewith,it. is essential that the rear-endof the gage be held snugly in the curve. and to thisenda plug Pisprovided, fitted to move snugly in the curve, having a. hole through which the clamp- :screw 0 is inserted, this screw having anut ,M. on itslower. end to hold the parts-securely in place. Instead of the plug P being made separate it, may. of. course be made with the .gage, though I prefer the construction shown, asit is. much less expensive;,but I do not ',limit myself as to the particular mechanism for holding the gage snugly in the groove. I have referred to the outer. end of the slot as a line therefrom at right angles to theline of cut would cross saidline ofv cut; butpracti- .cally the slot is carried outward farther to give space for the connections which. hold the gage in the slot;

I claim as my invention-- 1. In a miter-cutting machine,,,a gage having a free front end and connections forholding it closely ina slotin the base,.combined with a bearing-post. for. the front end and a base having-a curvedslot the partsof'which Lare equidistant. from a shifting center on a :line identical or parallel withthe line of'cut,

substantially as described.

being a certaindistance from the front when 2. In a miter-cutter machine, a gage, a snpthe front end of the gage, substantially as de port for the front end of said gage against scribed. 10 the thrust of the knife, and a curved gnid In testimony whereoflaffix my signature in ing-bearing for the outer end of said gage for presence of two witnesses.

5 maintaining the shearing-edge in aline iden- WILLIAM R. FOX.

tical 01' parallel with the plane bf the out, Witnesses: the parts of said bearing for the outer end JOHN DUFFY,

being equidistant from a shifting center on GEO. DUBRIDGE.

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