US171932A - Improvement in miter-cutting machines - Google Patents

Description

. Gin. eovn; MITER-CU'ITING- MACHINE.

No.171,932. Patented Jan. 1-1, 1873.

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GEORGEH. GOVE, or ROGKFORD,ILLINOIS.

IMPROVEMENT IN MlT-E R-CUTTlNG MACHINES.

Specification forming part of Letters Patent No. 171,932, dated January 11, 1876 application filed May 10, 1875.

To all whom it may concern: Be it known that I, GEORGE'H. GOVE, of Rockford, in the county-of Winnebago and State of Illinois, have invented a new and useful Improvement in Miter-Cutting Machines; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings and to the letters of reference marked thereon.

Figure l is a plan or top view of my improved miter-box. Fig. 2 is an end View of the saw-guide and saw-clamp set at an angle of forty-five degrees with the bed of the machine. Fig.3 is a side view of the saw-guide, showing the springs which press the clamp and keep the saw in position; and Fig. 4 is a top view of the quadrant detached, with one of the index-sections removed.

Similar letters of reference denote correponding parts in all the figures.

The invention relates to a novel manner of hinging the saw-holding device, giving the same both a lateral and vertical adjustment, and in such manner that an ordinary handsaw can be used, as hereinafter described. It also relates to the manner of adjusting and holding the saw at any required angle of the work to be operated upon, as will be explained. It further relates to the construction and arrangement of an adjustable index-plate, in combination with the locking device, whereby any inaccuracy of adjustment may be remedied, all of which will be hereinafter described.

In the accompanying drawings, A repre sents the bed-frame, preferably made of metal, rectangular in form, mounted upon feet A with holes through the same for securing to the bench or table. Upon the top of the metal bed-frame is placed and secured to said frame a wood facing, B, to prevent the teeth of the saw coming in contact with the metal after the molding has been severed. A is a rest. or stop standing at a vertical right angle with the face B, and against which the piece to be mitered rests. O is a post made from round iron, having two right-angled flat surfaces extending the whole of the length, and placed with the angled corner toward the bed of the machine. 0 is airear secured to the back side of frame A, and provided with a suitable socket for the reception of the upright post O, which is held in position by. set-screw c. d. is an cared socket-piece or hinge, which is made to fit upon and swing around the upright 0. To the ear of the socket-piece d is secured, by bolts, screws, .or otherwise, the saw.- guide D. On the top of the saw-guide is secured a metal plate b, having cars bl b b 11 the ears b having lips or projections, which reach over and rest upon theface of the indexplate, thus holding the saw-guide in position vertically. Longitudinally between ears b 11 and pivoted to b, is a lever, a,havingaknifeedge at the end coming in contact with the index-plate, which holds the saw-guide in position laterally. lever a rests upon a perpendicular springstop, a, which, it will be observed, keeps theknifeedge end in its place in indentations prox'ided in the index-plate. By pressing down upon this spring end of the lever the reverse end is released from the index, and the saw-guide can be swung around and set at any desired angle. D is a spring-clamp, held in place by the bent iron D one leg of which is secured in any suitable manner to the saw-guide D, the

other leg supporting the spring-clamp by screws or bolts, which pass through the leg, springs E and E, and into clamp D. The

springs E and E are preferably made of flat steel, being curved in such manner that the ends rest against the clamp D. The center of the springs has perforations sufficiently large to give freedom of motion upon the retaining-bolt, and by which the. tension of the spring may be regulated. F is an oblique mortise, one-half of which is made in clamp D, the other half in guide D, so as to enable the operator to see the molding or piece .to be mitered at the point of contact with the saw. G is asection ofa circle or quadrant, of which the upright O is the center, having ahub With an opening through the same to correspond with the circumferential part of upright 0, upon which it is adjusted and held at any vertical point by the set-screw G. Upon the upper surface of the quadrant or circular section G, and near the convex periphery, is a rib or flange, t, which enters a corresponding groove in the index-sections g g 9 the use of which will now be explained. To cut diagonally The reverse end of the saws through the grain of wood the saw must be sharp and truly filed, or the tendency is to run to one side of the true line. To obviate this ditficulty Imake my indexplate in sections, usually three in number. The middle or center one, for giving a square out, can be permanently secured to the quadrantby a screw,-

threaded bolt passing through the rear exten sion, as shown, on in any other suitable manner. Sections g-and g are made similar to the center section g 'but, as they alone are provided with indentations for setting the saw for cutting angles,the ears have elongated holes, so that they can be moved to the right or to the left, aslmay be required to accommodate the variations of the saw, the flange t keeping them in position as to their movement tothe frontor rear. It will be understood that the saw is to he used between the rest D and spring-clamp D.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, isa V tially as set forth. in

3d lay of April, 1875.

,1. The revolving saw-guide D5 provided with the clamp D and spring E E, in combination with the locking device, wherehyQany desired angle may be given to the saw for operating upon the molding, substantially as described. i

2. The quadrautor plate G, plate or plates g g 9, having a vertical adjustment upon the upright bar O, secured by the set-screw G, or its equivalent, in combiuationwith the bedframe A, substantially as described.

l 3. lhe saw-guide D ,cla|np D, provided with the mortise or opening F,for giving the operator a view of the work, as described, combined with the hinge d, pivoted to the up right 0, all arrangedand operating substan- Thisspecifi'cation signed and witnessed this GEORGE H. GOVE. Witnesses:

G. W. FORD, A. G. JOHNSON.

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