US722051A - Adjustable miter-box. - Google Patents

Description

No. 722,051, PATBNTED MAR. 3, 1903.

A. SHERMAN & J. R. MORE.

ADJUSTABLE MITER BOX.

APPLICATION FILED JULY 31, 1902.

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NO MODEL.

INVENTORLS WITN ESSES.

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No. 722,051. PATBNTBD MAR. 3, 1903. A.'SHBRMAN & JQ. R. MOORE.

ADJUSTABLE MITER BOX. APPLIOATION FILED JULY 31, 1902.

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llNTTnn STATES PATENT OFFICE.

ADOLF SHERMAN AND JOHN R. MOORE, OF BRIDGEPORT, CONNECTICUT.

ADJUSTABLE NilTER-BOX.

SPECIFICATION forming part of Letters Patent No. 722,051, dated March 3, 1903.

Application filed July 31, 1902. Serial No. 117.791. (No model.)

To ctZZ whom. t may concern:

Be it known that we, ADoLF SHERMAN and JOHN R. MOORE, citizens of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut,have invented a new and useful Adjustable Miter-Box,of which the following is a specification.

Our invention has for its object to provide a simple, inexpensive, and easily-operated miter-box which shall be adapted for all of the various uses to which ruiter-boxes are ordinarily applied by carpenters, joiners, and artisans generally.

l/Vith these ends in view our invention consists in certain constructions and in certain parts,improvements,and combinations,which will be hereinafter described and then specifically pointed out in the claims hereunto appended.

In the accompanying drawings, forming part of this specification, in which like characters of reference indicate the same parts, Figure 1 is a side elevation of our novel miterbox complete; Fig. 2, a plan View corresponding therewith; Fig. 3, an inverted plan view, one of the angle-arms being thrown outward and being indicated at an intermediate position by dotted lines; Fig. 4, an end view as seen from the left in Fig. 3, and Fig. 5 is a section on the line 5 5 in Fig. 3.

10 denotes the body, and 11 the back plate. The body and back plate may be made of metal and, if preferred, cast in a single piece, or said parts may be made of wood and secured together in anysuitable manner. With- :in the body is a recess 12, covered by a top plate 13, which rests upon lugs 14 and is secured in place by screw 15.

16 denotes angle-arms hinged to the ends of the body and adapted to swing out in line with the back plate, as Clearly shown in Fig. 3. The body is shown as resting upon short legs 17, so that the angle-arms will swing clear of the ioor or whatever the instrument may rest upon.

18 denotes oscillating saw-guides pivoted in the body at the ends of the back plate, and 19 guide-rods, threaded or otherwise rigidly secured in the saw-guides and extending outward therefrom.

20 denotes an adjustable gage-plate, having a slot or slots 21, in which other oscillating saw-guides (indicated by 22) are adapted to slide. Saw-guides 22 are provided with Shanks 23, which engage the slots in the gage-plate, bushings 2 being preferably interposed between the Shanks and the slots in which they slide. The Shanks also preferably pass through washers 25, which engage shoulders on the saw-guides and rest upon the top of the gage-plate. The lower ends of the shanks are threaded and are engaged by wing-nuts 26, by which saw-guides 22 may be locked in position after adjustment in the manner we will now describe.

27 denotes transverse holes in the Shanks, through which guide-rods 19 pass freely. The guide-rods are shown asprovided with enlargements to receive slots 28.

29 denotes bell-crank levers pivoted in recess 12. One arm of each bell-crank lever is provided with a pin 30, which engages one of the slots 28, as clearly shown at the right in Fig. 2. A link 31 connects the other arm of each bell-crank lever with one of the anglearms 16, as is also clearly shown.. The gageplate is provided with arms 32, having slots 33 and passing under the body, as clearly shown in Fig. 3. Screws 34, passing through the slots,engage the body and retain the gageplate in place, while permitting it to move in and out freely. A rod 35, the inner end of which is threaded or otherwise rigidly secured in the body, passes through a hub 36 upon the gage-plate. A set-screw 37 in the hub engages the rod and locks the gage-plate in any position in which it may be placed, it being only necessary to move it outward away from the body when wide moldings or other strips are being mitered.

The bell-crank levers and the links are so proportioned relatively to each other and so connected to the angle-arms and guide-rods that the guide-rods will move just half as fast as the angle-arms. The operative surfaces of the instrument in use are the outer face of the back plate and the outer face of the angle-arms, which for clearness of illustration we have indicated, respectively, by 11 and 16a. It will be understood from the position of the parts in full lines at the right in Fig. 2 that when the operative surfaces are at an angle of ninety degrees to each other the guide-rod will be at an angle of forty-live de- IOO grees to each of the operative surfaces and from the position in dotted lines that when the angle-arm is extended in line with the back plate the guide-rod will lie at an angle of ninety degrees to both of the operative surfaces.

The operation of our novel miter-box is as follows: Suppose that it is desired to cut moldings or other strips for the obtuse angles of a bay-window. The operator loosens one of the wing-nuts 26, so that the oscillating saw-guide 22 may slide freely in the slot in the gage-plate. He then places the instrument in the angle, resting the two operative surfaces firmly against the Wood Work. When the angle-arm is moved, the effect will be, through the bell-crank lever and link,to swing the guide-rod, and the guide-rod will in turn swing both of the saw-guides, maintaining the guide-slots 38 in the saw-guide 18 and the corresponding saw-guide 22 in line with each other. It will be noted that the oscillation of saw-guide 18 is caused by the rigid attachment thereto of the guide-rod, and the oscillation of the corresponding saw-guide 22 is caused by the movement of the guiderod through the transverse hole 27 in shank 23, it being understood that the guide-rod slides freely through this hole, and as the shank of the saw-guide moves freely in either direction in the slot in the gage-plate it follows that when movement of the guide-rod takes place in either direction the saw-guide 22 must oscillate just suiiciently to keep the guideslot therein in line with the guide-slot in the corresponding saw-guide 18. Having placed the operative surfaces at the desired angle with relation to each other, the operator locks the saw-guide 22, and with it the guide-rod and angle-arm, in position by tightening the wing-nut. 'For convenience in setting the other angle-arm after either of them has been set we provide scales 39 upon the gage-plate. These scales may be graduated and numbered in any preferred manner. For example, a degree-scale that will indicate the degree of the angle, or, if preferred, a simplie set of numbers, may be used, it being simply required after having set one of the angle-arms to set the other at precisely the same angle. Having set both of the anglearms, the operator proceeds to miter a molding or other strip by placing it in the body, resting against the back plate, and then sawing olf the end by means of a saw lying in the guide-slots 38 of a saw-guide 18 and the corresponding saw-guide 22.v To miter another piece to match the piece just prepared, the operator would place it at the other end of the instrument and would place the saw in the other pair of saw-guides, it being understood, of course, that the operation of setting the instrument and mitering corresponding pieces of molding can be performed in very much less time than it takes to describe the operation-in fact, an amount of time that is`hardly appreciable. The top of the angle-arms may be slightly lower than the surface of the top plate, if preferred, although that is immaterial. The length of the body likewise-is a matter of no importance so far as the principle of the invention is concerned and may be changed by builders to suit the special requirements of uses for which the instruments are intended.

Having thus described our invention, we claim- 1. A miter-box consisting of a body, an angle-arm hinged at the end of the body, an oscillating saw-guide, a guide-rod extending therefrom, a saw-guide carried by the guiderod and connections intermediate the anglearm and the guide-rod, whereby the guiderod is caused to move half the distance traversed by the angle-arm and the saw-guides are placed in position to cut a miter corresponding to the angle at which the angle-arm is placed relative to the body.

2. A miter-box consisting of a body, a back plate, an angle-arm hinged at the end of the body, an oscillating saw-guide, a guide-rod extending therefrom, a saw-guide carried by the guide-rod, connections intermediate the angle-arm and the guide-rod whereby the guide-rod is caused to move half the distance traversed by the angle-arm and means for locking the parts in position after adjustment.

3. In an instrument of the character described, the combination with a body, an angle-arm hinged thereto and a saw-guide oscillating thereon, of a guide-rod extending from the oscillating saw-guide, connections intermediate the angle-arm and the guide-rod whereby the guide-rod is caused to move half the distance traversed by the angle-arm and another saw-guide carried by the guide-rod.

4. In an instrument of the character described, the combination with a body, a back plate and an angle-arm hinged at the end of the body, of an oscillating saw-guide, a guiderod extending therefrom, connections intermediate the angle-arm and the guide-rod whereby the guide-rod is caused to move half the distance traversed by the angle-arm and a saw-guide 22 carried by the guide-rod.

5. In an instrument of the character described, the combination with a body, an angle-arm hinged thereto, a saw-guide oscillating thereon, a guide-rod extending from the oscillating saw-guide and connections intermediate the anglearm and the guide-rod whereby the guide-rod is caused to move half the distance traversed by the angle-arm, of a gage-plate having a slot and a saw-guide having a shank engaging said slot and a transverse hole through which the guide-rod passes.

6. In an instrument of the character described, the combination with a body, an angle-arm hinged thereto, a saw-guide oscillating thereon, a guide-rod extending from the oscillating saw-guide and connections intermediate the angle-arm and guide-rod where- IIO by the guide-rod is caused to move half the distance traversed by the angle-arm, of a gage-plate adjust-ably secured to the body and provided with a slot, a saw-guide having a shank engaging the slot and a transverse hole through which the guide-rod passes and means for locking the saw-guide carried by the guide-rod in the slot in the gage-plate.

7. In an instrument of the character described, the combination of a body, having a rod 35 extending therefrom, an angle-arm hinged to the body, a saw-guide oscillating on the body a guide-rod extending from the saw-guide and connections intermediate the angle-arm and guide-rod whereby theguiderod is caused to move half the distance traversed by the angle-arm, of a gage-plate having slotted arms by which it is secured to the body a longitudinal slot 2l and a hub through which rod 35 passes, a set-screw in said hub by which the gage-plate is locked in place, a saw-guide having a shank engaging slot 2l and a transverse hole through which the guide-rod passes and a wing-nut on the shank by which the saw-guide carried by the guide rod is locked to the gage-plate.

8. In a machine of the character described,

the combination with a body, an angle-arm A. M. WOOSTER, E. GALLAGHER.

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