US192139A - Improvement in miter-boxes - Google Patents

Description

J. A. TRAUT.

Munn-Box.

PgtentediJune 19, 1877.

N. PETERS. PMOTOLLITHDGRAPMEH, WASHINGTON. Dv

.my invention.

NITED STATES.

JUsTUs A. TRAUT, oF New BRITAIN, CONNECTICUT.

IMPRQVEMENT INMITEmBoxEs.

Specification forming part of Letters Patent No. 192,139, dated June 19, 1877 application filed January 8, 1875. i

To all whom it may concern:v

Be it known that I, JUSTUS A. TRAUT, of New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Miter-Boxes. of which the following is a specification My invention consists, iirst, of the facingboard, having a narrow V-sided slot, the widest part of which is qu the rear side of said board,in combination with the swingbeam, having its axis of motion located centrally with said slot from right to left, and in thefsame vertical plane with the face `of the facing-board; second,'in the frame-carrying shafts, in combination with the clampingsocket at the end' of the swing-beam; third, in the shafts, provided with small caps, in combination with guiding-rollers, which are counterbored, so that said caps are allowed to enter the interior of said rollers; fourth, in the removable connecting-bar, detachable from both guiding-rollers, and,fth,in the interchangeable positive stops forl positively stopping the fall of the rollers at diierent points, as desired, all as hereinafter fully described.

In the accompanying drawings, Figure 1 is a plan viewof a miter-box which embodies Fig.2 is a transverse section of the same on line w a: of Fig. 1. Fig. 3 is a detached view of' the saw-guiding rollers which belong'to said machine; and Fig. 4 is afplan view of the connecting-bar for said rollers.

Theframe or bed A is made of one and the same piece of cast metal with the facingboard or back B, said bed being elevated a little by suitable legs and covered with a thin board. 4 A f To theunder side of the bed A a cross-arm" or swing-beam, G, is secured by means of a bolt, D, which forms the axle upon which the beam O swings. The axis of the swing-beam Gis in the same vertical plane as the face of the facing-board B, as shown in Figs. land 2. The ends of the swing-beam C project one to the rear of the facing-board and the other at the front of the frame A. Perpendicularly to this swing-beam, and at each end, are the saw-guiding rollers a a,loosely fitted, so as to and down the upright shafts c o.

' rollers and prevent the saw Small capsb b are secured upon the upper ends of one shaft, c, of each pair of rollers,

and the upper ends of' the guiding-rollers a a are counterbored to about one-half their depth,

and of a size sufficient to admit the caps b b,- so that the guiding rollers may be raised above the ends of the shafts c c until stoppedl By reason of so connecting the rollers a a|` only one cap is necessary in order to hold each pair of rollers from slipping cli' the shafts c c. The rear pair of the guidingroll ers have two grooves, o o. By removing the cap b and slipping oli' the rollers the connecting-bar s may be placed in the lower groo'ves.

The shafts o c `are secured to a`T-shaped frame, E, the upright of which is a round shaft, and is secured in a spring clampingsocket, F, at the ends of the swingbeam Q, and is held within said socket by means of a screw, d. The rollers u u and connecting bars s s enable me to use a ribless or panelsaw, as it is termed. In order to use such a saw the cap b and rollers a aare removed, so as to detach the rear connecting-bar, and they are replaced with said connecting-bar in the lower grooves o of the rollers al a., and; the ta pering panel-saw is passedunder both conmeeting-bars,I as designated by broken'lines in Fig; 2. Thus placing the rear connectinglbar lower thanthe 'front one compensates`for` ythe taper of the saw, so that the rollers are ,about on Athe same horizontal plane, and as the saw cuts its way through the work the rollers fall with the saw. y

The T-frames E E should be so placed that so soon as the saw has passed through the work the saw-teeth will strike the soft-metal from coming in contact with the bed.

I also providea series'ot' interchangeable washers, w, which constitute positive stops for each pair of shaftscc. When it is de-V sired to set the saw-guiding rollers for a very wide-ribbed saw, all of the stops in each series w are placed upon one shaft, as shown in Fig. 2. The rollers are then placed on the shafts, when one of them will strike the stops w, and positively prevent that roller from falling below said stops, and the connecting-bars ss will hold up the other roller, and the T- frames E, carrying the rollers, may be raised or lowered, so that the saw, when dropped as low as the rollers will permit, will just clear the bed A.

For a narrower saw, a part of the stops u may be removed, and, for convenience of not losing them, those not in use may be slipped upon the other sha-ft belonging to the same air.' p The front of the frame A has a curved or segmental member, which is provided with holes, that form an index, Gr, and which index-plate G is also cast in one and the same piece of metal with the frame and facingboard.

The swing-beam C is provided with a spring catch-pin, h, which engages lwith the indexplate G, and secures the swing-beam C and its saw-guides a a. at various angles, to the facing-board B. This facing-board may be marked off or graduated into inches and fractions thereof, for convenience of gaging the length of the work to be cut.

This facing-board B is also slotted near the middle of its length with a narrow vertical slot, the walls of which, on a horizontal plane, are V-sided, the opening being the widest at the rear, as shown in Fig. l, and the axis of the swing-beam is located centrally from right to left with said slot.

So far as merely supporting the work upon a frame and cutting it oft' at various angles is concerned, the machine is substantially like prior unter-boxes, except that it is more convenient, substantial, and reliable.

By placing the axis of the swing-beam O in the same vertical plane as the face of the facing-board, and centrally, from right to left,

' withthe V-sided slot in the-facing-board, the portion of the saw-blade which is in the saine vertical plane as the facing-board will not move laterally in the act of changing the fvswinggbiam from angle to angle, as it doesin ing-board will better support the work, especially short pieces, than will machines with swing-beam differently hung, and, necessarily, having a larger portion of the facing-board removed.

By hanging the roller-guides upon the T- shaped frame within the spring-socket they can be raised and lowered, to accommodate saws of different widths, and, also, the wear of the saw, while, by twisting the T-shaped frame so that the rollers stand slightly out of a transverse perpendicular line to the sawblade, the rollers are caused to bear upon both sides of the saw and properly guide it. By this arrangement the rollers are adjusted to accommodate thick or thin saws, as occasion may require.

As a whole, the machine is cheap to manufacture, convenient to use, and not liable to easily get out of working order.

I claim as my inventionv 1. The facing-board B, having a narrow V- sided slot, the widest part or top of which V is on the rear side of said board, in combination with the swing-beam C, having its axis of motion located centrally with the said slot from right to left, and in the same vertical plane with the face of the facing-board, substantially as described,'and for the purpose specified. f

2. In a miter-box, the T -shaped frame, carrying only one pair of guiding-rollers, c a

and secured within the clamping-socket at the ends of the swingbeam, substantially as` described, and for the purpose set forth.

3. In a saw-guide for a miter-box, the shaft c c, provided with caps b b, in combination with the rollers a a, counterbored, as described, whereby the rollers are allowed to rise above the ends of the shaft, but are prevented from becoming accidentally detached or slipped off, as set forth.

4. The combination of the rollers au., having grooves o o, with the removable connecting-bars s, all substantially as described, and for the purpose set forth.

5. The rollers a a, having grooves o o, in combination with the connecting-bar s and seriesof washers w, substantially as and for the purpose set forth.

JUs'rUs A. TRAUT.

Witnesses:

T. A. CONKLIN, H. S. WALTER.

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