US3782235A

US3782235A - Miter box

Info

Publication number: US3782235A
Application number: US00319547A
Authority: US
Inventors: M Curcio
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-12-29
Filing date: 1972-12-29
Publication date: 1974-01-01
Anticipated expiration: 1991-01-01

Abstract

The present invention relates to an improved miter box for use by carpenters and others in making miter joints, particularly for mitering picture, cove, casing and base mouldings. The general improvement lies in substituting a square-shaped box for the conventional U-shaped form, and making this miter box in the form of a single, integrally moulded, transparent plastic unit. This structure with its inherent rigidity gives durability, strength and precision to the box itself, all of which aid in achieving precision in the mitering of joints. A support bar is placed along one inside base edge to support hand-held, angularly disposed mouldings and L-shaped corner mouldings in particular at proper cutting angles. Cut-outs are provided in the top for holding work pieces in place. The use of a transparent plastic provides full visibility of the work piece to the user. It also improves the durability of the miter box and increases precision in the cutting or mitering because the saw will not cut easily into the saw cutting guides of its side walls.

Description

mit

Eurcio tates atent [191 Jan. 1,1974

[ METER BOX [76] Inventor: Michael P. Curcio, 50 Lind Rd.,

Totowa, NJ. 07512 [22] Filed: Dec. 29, 1972 [2]] Appl. No.: 319,547

Primary Examiner-Donald R. Schran Attorney -James Qannggj r.

[57] ABSTRACT The present invention relates to an improved miter box for use by carpenters and others in making miter joints, particularly for mitering picture, cove, casing and base mouldings. The general improvement lies in substituting a square-shaped box for the conventional U-shaped form, and making this miter box in the form of a single, integrally moulded, transparent plastic unit. This structure with its inherent rigidity gives durability,.strength and precision to the box itself, all of which aid in achieving precision in the mitering of joints. A support bar is placed along one inside base edge to support hand-held, angularly disposed mouldings and L-shaped corner mouldings in particular at proper cutting angles. Cut-outs are provided in the top for holding work pieces in place. The use of a transparent plastic provides full visibility of the work piece to the user. lt also improves the durability of the miter box and increases precision in the cutting or mitering because the saw will not out easily into the saw cutting guides of its side walls.

2 Claims, 2 Drawing Figures MITER BOX BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to improvements in a miter box for use by carpenters and others in making miter joints, particularly for mitering picture, cove, casing and base mouldings.

2. Description of the Prior Art The most recent US. 'Pat. in this field, No. 3,397,722, is directed to the solution of a very common problem, i.e., that of making perfectly fitting. miter joints from pieces of angularly extending mouldings. In place of the conventional method of laying such pieces flat on the bottom of the conventional U-shaped miter box, that patent disclosed an adjustable supporting means within a conventional U-shaped miter box for such mouldings; that is, a means to support the angularly extending pieces of moulding in an angularly disposed manner to increase the precision of mitering the joints. The means disclosed in this patent was adjustable to varying sizes and angles of inclination. The mechanical means of accomplishing this object included slotted 45 angles in the base of the conventional U- shaped miter box with adjustable support elements extending upward into the box to support mouldings and prevent their slippage. This patent also disclosed the removal of a semi-circular section of one side wall of the conventional U-shaped miter box to serve as a viewing window to improve the carpenters view of his work within the miter box, and especially to improve his view of the adjustable supporting means and work piece.

However, the conventional U-shaped miter box of U.S. Pat. No. 3,397,722 has several disadvantages which materially impair its utility. The U-shaped, conventional miter box has inherent structural weaknesses which become accentuated through long and constant use. In particular, the side walls work loose from the base and become unstable in long constant use. The tops of the sidewalls have no substantial structural support and are inherently weak. The introduction of a semi-circular cut-out in one side wall increases the inherent structural weakness of the conventional U- shaped miter box and therefore is a distinct disadvantage.

The support elements held in place in the angular slots protrude upwards from the base of the miter box and become a distinct annoyance when sawing other boards or types of mouldings. Frequently they have to be removed to utilize fully the miter box for sawing base and case mouldings.

Carpenters prefer not to be bothered with clamping means such as that disclosed in this patent, preferring to hold the work piece in place with their hands. They believe that the use of clamps slows down their work.

The present invention combines improvements over the advantages of this prior patent while eliminating its disadvantages.

SUMMARY OF THE INVENTION The present invention relates to an improved miter box for use by carpenters and others in making miter joints, particularly for mitering picture, cove, casing and base mouldings. The general improvement lies in substituting a square-shaped box for the conventional U-shaped form, and making this miter box in the form of a single, integrally moulded, transparent plastic unit. This structure with its inherent rigidity gives durability, strength and precision to the box itself, all of which aid in achieving precision in the mitering of joints. A support bar is placed along one inside base edge to support hand-held, angularly disposed mouldings and L-shaped corner mouldings inparticular at proper cutting angles. This support bar enables the user to hold an L-shaped corner moulding in a rigid position, thus preventing twisting of the moulding and enabling the user to cut the moulding at the correct angle. Cut-outs are provided in the top for holding work pieces in place. The use of a transparent plastic provides full visibility of the work piece to the user. It also improves the durability of the miter box and increases precision in the cutting or mitering because the saw will not cut easily into the saw cutting guides of its side walls.

Accordingly, it is the principal object of the present invention to provide a simple, improved miter box for making miter joints which has structural strength throughout to aid in making precise joints.

It is a further object of this invention to provide an improved miter box which increases the visibility of the work piece to the user.

It is still another object of this invention to provide an improved miter box which is simple in construction, convenient and durable in use and helpful in achieving precision in work.

Other objects, features and advantages of this invention will become apparent from a study of the following description read with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top perspective view of the improved miter box embodying the principles of the present invention.

FIG. 2 is a fragmentary, three-dimensional view of a corner of miter box 10 showing an L-shaped corner moulding in place on the support bar.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing of FIG. 1, the reference numeral 10 denotes generally the miter box of the present invention. Miter box 10 is preferably molded as one integral unit from a durable transparent plastic. For reference purposes the bottom or base will be designated by reference numeral 12, the top or cover by reference numeral 14, and the vertically extending side walls by reference numerals l6 and 18. The cover 14 has two cut-outs 20 and 22 to provide a means for the user to place his hands within the miter box 10 in order to position and hold the work piece. An elongated small support bar of transparent plastic 24 having a crosssectional area of approximately one square inch is fix- L-abIy attached at the intersection of base 12 and front 'sidewall 16 and extended longitudinally the length cise mitering. Support bar 24 may also be positioned along rear sidewall 18.

Miter box has located towards one end a vertical downwardly extending slot 26 made at a 90 angle to its longitudinal axis. This vertical slot 26 extends downward from and through cover 14, front and rear vertical side walls 16 and 18, through support bar 24 and partially through base 12 to a depth of approximately onefourth of an inch. Vertical downward extending

diagonal slots

28 and 30 are similar to slot 26 except that vertical slot 28 is disposed at a 45 angle to the longitudinal axis of the work piece and vertical slot 30 is disposed at a 135 angle to the longitudinal axis of the workpiece. All

vertical slots

26, 28 and 30 serve as guides for a saw used in mitering joints.

Since miter box 10 is preferably constructed of a durable, hard, transparent plastic, the user is able to see the work piece and its location relative to support bar 24 and

saw guide slots

26, 28 or 30. This visibility of the work piece and the work process is a positive factor in improving the precision of the mitering ofjoints.

The construction of miter box 10 as a single integrally molded box eliminates the inherent weakness of the conventional U-shaped miter box at the points where vertical side walls 16 and 18 join the base 12. In addition, the use of a cover 14 integrally molded with side walls 16 and 18 eliminates the inherent weakness of the conventional U-shaped miter box in which the tops of the side walls are substantially unsupported and also weakened because of multiple slots cut therein.

The utilization of a durable plastic in the construction of miter box 10 substantially adds to the durability of

slots

26, 28 and 30. It decreases the frictional loss between the saw and the slot and will resist the inaccurate sawing into the slots better than the conventional wooden box. This, in turn, increases the precision of mitering.

Thus it will be seen that this invention provides a simple, efficient, durable and useful improvement to the conventional miter box. it is so constructed as to provide greater structural strength than heretofore available, increased visibility of the work piece and mitering process and increased durability of the box and the saw guide slots. All these advantages are relevant to increased precision in use. Additional saw guide slots at varying angles may also be provided.

While there has been illustrated and described a single specific embodiment of the present invention, it will be understood that this is by way of illustration only, and that various changes and modifications may be made within the contemplation of my invention and within the scope of the following claims.

I claim:

1. A miter box for use in mitering picture, cove, casing and base mouldings comprising:

an elongated base;

two elongated side walls extending vertically upward and integrally formed with the longitudinal edges of said base at right angles thereto;

an elongated cover extending horizontally from side wall to side wall on a plane parallel to said base and integrally formed with the upper longitudinal edges of said side walls at right angles thereto;

an elongated support bar of relatively small crosssectional area extending along the longitudinal intersection of one sidewall with said base and integrally formed therewith for rigidly supporting angularly disposed mouldings and L-shaped corner mouldings;

said base, side walls, cover and support bar being integrally molded of a transparent, durable plastic substance to permit viewing of the work piece and sawing process within said box;

a plurality of diagonally extending saw guide slots extending vertically downwards through and from the cover of said box, through said side walls and partially through said base;

a plurality of cut-outs in the cover of said miter box to enable the user to insert his hands therein to position and hold a work piece.

2. The miter box as defined in claim 1 further comprising:

a saw guide slot perpendicular to the longitudinal axis of said miter box extending downwards through and from said cover of said miter box, through said side walls and partially through said base for cutting straight joints.

Claims

1. A miter box for use in mitering picture, cove, casing and base mouldings comprising: an elongated base; two elongated side walls extending vertically upward and integrally formed with the longitudinal edges of said base at right angles thereto; an elongated cover extending horizontally from side wall to side wall on a plane parallel to said base and integrally formed with the upper longitudinal edges of said side walls at right angles thereto; an elongated support bar of relatively small cross-sectional area extending along the longitudinal intersection of one sidewall with said base and integrally formed therewith for rigidly supporting angularly disposed mouldings and L-shaped corner mouldings; said base, side walls, cover and support bar being integrally molded of a transparent, durable plastic substance to permit viewing of the work piece and sawing process within said box; a plurality of diagonally extending saw guide slots extending vertically downwards through and from the cover of said box, through said side walls and partially through said base; a plurality of cut-outs in the cover of said miter box to enable the user to insert his hands therein to position and hold a work piece.

2. The miter box as defined in claim 1 further comprising: a saw guide slot perpendicular to the longitudinal axis of said miter box extending downwards through and from said cover of said miter box, through said side walls and partially through said base for cutting straight joints.