US1569768A - Plasterer's mitering plane - Google Patents

Description

Jan. 12,1926; 1,569,768

J. MCNAMARA, JR

PLASTERERS MITERING PLANE Filed Jan. 28. 1924 Vom/EX Patented Jan. 12, 1926.

' UNITED STATES JAMES MQNAMARA, JR.,

oF PORTLAND; OREGON'.

PLASTERERS MITERING- PLANE.

Application led January 28, 1924. Serial No. 689,123.

To ZZ whom lamong cof/merry:

Be it hereby known that I, JAMES MC- NAMAKA, Jr., a citizen of the United States, and a resident of Portland, in the county of Multnomah and State of Oregon, have invented a new and useful Plasterers vMitering Plane, of which the following is a specification.

rl`his invention relates generally to the plastering art, and more particularly to the construction of miter corners in mouldings made of plaster.

T he object of my invention is to provide an exceedingly simple and efficient mitering planeT which is in reality a four-sided plane for working the concave and convex surfaces of a plaster moulding accurately to the eX treme corner of the miter.

Another object is the construction of a plane so that its cutting tool can readily be sharpened and adjusted with the use of ordinary tools.

Still another object is the construction of the plane in a manner that the bit will cut on cit-her of two sides.

I accomplish these results in the manner set forth in the following specification and illustrated in the accompanying drawing, in which Figure 1 is a side elevation of the plane with its mid-section broken away to reduce its length. Figure 2 is a plan of Figure 1 with a portion broken away along the line 2 2 in Fig. 1. Figure 3 is a left end elevation of Figure 1. Figure 4 is a right end elevation of Figure 1. Figure 5 is a portional side elevation of a modified form of the device of which Figure 6 is a left end elevation. Figure T is a portional side elevation of still another modification of the device, of which Figure 8 is a left end elevation.

Similar numbers of reference refer to the same parts throughout the several views.

Referring in detail to the drawing, I have constructed my device in the form of a parallelogram having two long sides 10 and 11. The side 10 is flat and the side 11 is rounded, while the short sides 12 and 13 are flat and forni acute angles with the sides 10 and 11,.

in which are placed the large fillets 14 which are grooved along the center lines of the acute angles, above referred to, on both sides of the fillets 14 to receive the slotted bits 15 and 1G. Screws 1T are threaded into the fillets 14 and provide adjustment for the bits land 16. J

The faces 18 of the bits 15 and 16 project slightly beyond the face of the plane to give the required set. Cross braces 19 add stiffness to the long sides 10 and 11, andv at the same time provide better grips for the hands.

In Figures 5 and 6 I have illustrated a bit 20 which is provided with a dovetail 21 with adjusting screw 22. In Figures 7 and 8 the blade 23 is made double handed and provided with countersunk holes for the stove bolts 24.

rlhe sides 10 and 11 are made somewhat heavier near the points in the two modifications, just described, to permit the reception of the blades. It is preferable to slot the holes for the stove bolts 24 in the side 10 to permit of adjustment for the bit 23. If de sired a small piece of paper or other material may be used to till the gap between the blade and the shoulder on the side 10.

The operation of my device is as follows: The blades 15 are set with their cutting faces slightly projecting over the adjacent sides and the appropriate face 10, 11, 12 or 13 is placed against the moulding and the two moved baclwardly and forwardly until the point of the blade 15 has cut away the desired amount of material. This action tends to plane off the high spots and inequalities right up to the corner of the miter.

The sizes of the plane, formations of the faces and n'iethods of fastening and adjusting the bits can, of course, be varied greatlv to suit the convenience or demand for a special tool without departing from the spirit of my invention. I

I am aware that planes have been constructed employing a blade on the nose of the plane and using only one face of the plane, I therefore do not claim my device broadly but intend to cover only such forms and modifications as fall fairly within the appended claims:

1. A plasterers plane consisting of a quadrilateral frame having two opposite long sides, one of which is rounded and the other Straight, and having two short'. sides forming acute angles at opposite corners of said frame; and an adjustable bit placed across the edges of said acute angles.

2. A plasterers plane consisting of a four a faced frame forming a parallelogram and hams er-peltei; @eaten angled l, Corners, FSM@ frame Ahaving 'grooves cut. into f its sides through said corners, in combination with. Cutting blades litting.,intot said. grooves andv having the cutting edges'ofsaid blades eX- tending past the adjacent facesaatthe aforesaid corners of said frame.

3. A plasterers planel-fconsisting of `a hollow four-sided frame in the form of an angled: parallelo'ganif 'whose short sides form acute ,angles at opposite corners of saidifi'aine, one long side-of said frame having afronnded face and thc other three sides having straight faces; and a pair of cutting blades fadjustablyeecured along the center line of said acute" angled corners.

4. A plasterers plane consisting of a hollow parallelogigaxnfshaped;frame hav-ing onel rounded andl onefstraighty'iside and having two short sides forming oblique angles to said long'sidgegaid,iranies having large fillets forined'in each'of its pointed ends, and having, intermediate cross braces between said long sides, said fillets having grooves: formed` therein along the center lines of their respective angles;l and cutting blades `lor said grooveseach of which consistsI of U-shaped; blade whose closed sharpcned edge projects somewhat pastl the point of interseetion' of the adjacent sides of said traine and'ascijew yin said v'fillet adapted to furnish adjnstme'ntfor sa'id'b'lade.

' JAMES MCNAMARA, JR`r

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