US128963A - Improvement ifm miter-boxes - Google Patents

Description

" J; KING.

Im'proveme'nt n Miter-Boxes.

Patented Julyv 16, 1872.,

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IMPROVEMENT EN EWTERHBOXES.

Specification forming part of Letters Patent No. 128,963, dated July 16, 1872.

To all whom it may concern:

Be it known that I, J AMES KING, of Northampton,in the county of Hampshire and State of Massachusetts, have invented a new and useful Improvement in Miter-Boxes; and I do hereby declare that the following is a full, clear, and exact description thereof, reference bein ghadto the accompanying drawingmakin g a part of this specification and to the letters of reference marked thereon, in which- Figure l is a plan view of my invention, and Fig. 2 is a longitudinal section through line Hof Fig. 1.

My invention relates to a device for making miters, and consists of a semicircular plate pivoted at the center to a recess in a platform or table, so that it may be turned upon its pivot in either direction. A straight groove is made across the line of diameter of the plate inwhich to insert a bolt or pivot having a head or iiange upon the lower end, and a circular groove is also made near the outer edge of the plate. A lever having a longitudinal vertical slot made therein is attached at one end to the bolt or pivot which operates inthe straight groove, and this lever has abolt extending through the slot, said bolt moving in the circular groove and having a head .or iian ge on the lower end and a thumb-nut on the upper end. The pivot upon which the lever swings has also a thumb-nut upon its upper end, so that the lever may be changed from one side to the other of the halfcircle plate by merely loosening the thumbnut on top and moving the pivot in the straight groove to its desired position and then tightening the screw again, and the lever may be iirrnly fastened to the semicircular plate at any desired angle byloosening the thumb-nut upon the bolt which moves in the circular groove, moving the leve'r toits desired position, and then tightening the thumb-nut again and the half-circular plate may be secured in any desired horizontal position by turning in a thumbscrew against the edge of the plate. A groove is made in the upper surface of the table or platform in which slides Va piece having the sawguides attached at each end, and this may be secured in any desired position by turning in a thumb-screw against its edge.

That others skilled in the art may be able to make and use my invention, I will proceed to describe its construction and operation.

In the drawing A represents the table or platform having a semicircular recess made therein, in which is placed the semicircular plate a, which is pivoted to the pin s so as to turn freely thereon. A straight slot, i, is made in said plate, and the lever j', having the vertical longitudinal slot l therein, is pivoted in the straight slot fi by means of the pivot d having a flange or head upon the lower end and a thumb-nut upon the upper end. A semicircular slot, h, is made in the plate a, described from the pivot d as a center, and a bolt, j, eX- tends down through the slot l in the lever and also through the semicircular slot h, said bolt having a head or iiange upon the lower end by which it is confined in the slot and a thumbnut on the upper end. Two thumb-screws, n, one on each side, operate through threaded holes in the edge of the table and against the edge of the plate a, by means of which said plate may be confined in any desired position. A groove is made across the table, in which is fitted a piece, b, having the two upright sawguides c secured thereto, which maybe moved to and fro in the groove, and may be secured in any position desirable by the set-screw m.

The operation of my invention is as follows: If it is desired to saw the stuit' square across the lever f is placed upon the center line at H and the thumb-nut on the pivot d, and the nuts on the bolt f are both tightened, securing the lever in that position, and the semicircular plate a is secured in position with the line a: on the plate, and the line a on the table coinciding by turning in one of the set-screws a; and the sawguides c are secured in positionby the set-screw m being turned in against the piece b, all shown in Fig. 1. The stud', then placed against either side of the lever, maybe sawed square across. If it is desired to saw the stuii` to ruiter at an angle of forty-five degrees, the plate a is turned so that the line x on the plate will coincide with the center line H on the table, and secured in that position by one of the setscrews n at the side. This brings the lever in the position shown in dotted lines at u at an angle of forty-uve degrees. to the saw-guides c, and the stuff may be sawed' at that angle; or, instead of moving the plate a, said plate may be still secured in position shown in Fig. l, and the thumb-nut on the bolt f may be 2 iaeea loosened and the lever moved on the plate into the position shown in dotted lines at a,

the bolt J sliding around in the sloth, andl the lever is then secured in that position by tightening the thumb-nut; and the plate a or the lever f may be moved and secured into any other position desired to saw stuft' at any other required angle.

The capacity of the device may be very much enlarged for the purpose of sawing large stud', and this is an important feature of my invention. As arranged in Fig. 1, of course no stu can be sawed except such as can be laid in between the lever f and one of the sawguides c; and for sawing small stuff this is an advantage, as the guide c is near the stuft' and there is less liability to variation. lf larger stuff is to be sawed the saw-guides c are moved to one side by sliding the piece b along in its groove to its position, and the thumb-nuts on the bolt f' and pivot d are both loosened and the lever moved to the position shown in dotted'lines at u', the plate being still secured in the position shown in Fig. l 5 or the lever may be secured in position, as shown in Fig. l, and the plate a be turned to an angle of forty-five degrees and secured by one of the set-screws a, as may be most convenient. This device may be attached with great advantage to a movable platform upon a circular saw-table, a slot or saw-guide being made at Q2 extending in nearly to the plate a, dispensingrwith the saw-guides c; then, by securing the lever` in a position upon the plate a opposite to that shown in dotted lines at u, and placing a piece of Wood having straight parallel edges against the lever, and the stuli' to be sawed against that, any required angle may be sawed by pushing the platform having the table A thereon up to the saw. Of course a circular plate, instead of a semicircular one, may be used by placing the saw-guides at a sufficient distance from the circle to turn it Without departing from the principle of its operation.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

An improved ruiter-box, consisting of the table A, pivoted plate a, lever f, and movable saw-guides c, all constructed and operating substantially as specified.

JAMES KING.

Witnesses:

T. A. CURTIS, CLARENCE E. BUCKLAND.

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