US2875796A - Mitre square - Google Patents

Description

March 1959 JULIUS M. TESI 2,875,796

MITRE SQUARE Filed Nov. 22, 1957 759s! INVENT OR.

BY @Mm Julius M.

United States Patent MITRE SQUARE Julius M. Test, Yorkv'ill'e, Ohio Application November '22, 1957, Serial No. 698,131 2 Claims. (21. Ma -s6 The present invention generally relates to a mitre square employed for forming a guide for hand saws whereby a hand saw used by either a right or left hand person is accurately guided in relation to a piece of wood being sawed with the angle of the mitre square being fixed.

The primary object of the present invention is to provide a mitre square which is extremely simple in construction, accurate in operation, provided with no moving parts to become maladjusted and relatively inexpensive to manufacture.

An object of the present invention is to provide a mitre square of rigid construction having clip means for holding the saw against the guide surface of the square for accurately positioning the saw during the cutting operation.

A further object of the present invention is to provide a 45 or 90' mitre square having projecting lips thereon which act as guides against the work for retaining the square in position.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of the mitre square of the present invention being used for cutting a piece of wood;

Figure 2 is a longitudinal, vertical section taken substantially upon a plane passing along section line 2-2 of Figure 1 illustrating the details of construction of the mitre square and its relationship to the saw;

Figure 3 is a transverse sectional view taken substantially upon a plane passing along section line 3-3 of Figure 1 illustrating the projecting lips on the mitre square;

Figure 4 is a plan view of a modified form of mitre square.

Referring now specifically to the drawings, the numeral generally designates the mitre square of the present invention which is employed for guiding movement of a saw blade 12 as it cuts a kerf or slot 14 in a piece of wood 16. It is pointed out that the saw blade 12 may be of any conventional construction normally employed in combination with a hand saw and the device may be employed for cutting other materials which are capable of being cut by a hand saw.

The mitre square 10 includes a pair of oppositely disposed side wals 18' and 20 which are disposed in angular relation to each other and as shown in Figure 1, the walls 18 and 20 are arranged in the same angular relation to interconnecting pairs of side rails 22 and 24 with the acute include angle between the walls 18 and 20 and the side rails 22 being 45". Each wall 18 and 20'is provided with a flat outer surface 26 forming a working face for engagement with the flat surface of the saw blade 12. The upper edge of each of the walls 18 and 20 is provided with a downwardly extending socket 28 for slidably and detachably receiving the depending leg 30 of a U-shaped clip generally designated by the numeral 32 which also includes a downwardly depending leg 34 disposed against the working face 26 with the lower end of the leg 34 being flared outwardly as indicated by the numeral 36 whereby the clip 32 will resiliently engage the outer surface of the saw blade 12 thus holding the saw blade firmly and slidingly against the working face 26, during reciprocation of the saw blade 12 thus accurately guiding the saw blade 12 in relation to the face 26.

Each side rail 22 and 24 includes a vertical projecting lip defined by a recess 38 extending longitudinally along the inner face thereof. The lip defined by the recess 38 is adapted to engage the corner edge portion of the piece of wood 16 for orientating the rails 22 or 24 in parallel relation to the longitudinal axis thereof whereby the working face 26 will be disposed in predetermined angular relation to the longitudinal axis of the piece of wood 16 whereby the saw 12 will cut at the same predetermined angle.

The area between the walls 18 and 20 is open and the area between the rails in each pair of rails 22 and 24 is open with the upper and lower edges of the walls 18 and 20 being spaced inwardly of the outer edge of the rails 22 and 24 and being generally flush with the bottom of the longitudinal recesses 38 whereby the lips formed by the recesses 38 will be brought into engagement with the piece of Wood 16 when the lower edges or top edges of the walls 18 and 20 are engaged therewith.

The upper and lower edges of the walls 18 and 20 are each provided with a recess in the outer corner thereof as designated by the numeral 40 and the lips defined by the recesses may be engaged with a piece of wood in certain instances whereby the saw may be guided by the longitudinal rails 22 and 24.

Figure 4 of the drawings illustrates a plan view of a modified form of the invention designated generally by the numeral 50 in which the side walls 52 and 54 are arranged in such a manner that the wall 52 is in 45 angular relation to the longitudinal rails 56 and 58 while the wall 54 is in perpendicular relation thereto for cutting either a cut or a 45 cut. The remainder of the structure is the same and is designated by primed reference numerals.

By positioning the mitre square 10 against the upper surface of a plank, board, two by four or any other similar piece of wood or other material and sliding the same laterally thereof until one of the longitudinal lips defined by the longitudinal recess 38 engages the side surface thereof, the plates or side walls 18 and 20 are arranged in predetermined angular relation to the member being cut thereby forming a guide for the saw blade 12 which is inserted under the resilient clip by positioning under the leg 34 whereby the resilient clip 32 will hold and guide the saw blade during the reciprocation thereof.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A mitre square for use with a hand saw for guiding the saw during reciprocation in relation to an article being cut, said square including a pair of side walls having parallel upper and lower edges, longitudinal rails rigidly interconnecting the upper and lower edges of said walls, said walls being arranged in angular relation to each other and in angular relation to the rails, means on said rails for engagement with-a piece of wood to be clip detachably mounted on one of said side walls for slidably holding the saw blade against the side wall during reciprocation, said means for engaging the piece of Wood being out including a depending longitudinal lip defined by a recess on each longitudinal rail with the lip extending vertically from the adjacent edge of the side walls for engaging the edge'of a piece of wood when the side walls rest thereon thereby enabling the device to be used in an inverted position.

4 2. The structure as defined in claim 1 wherein each side wall is provided with a vertically extending socket therein, said resilient clip being substantially U-shaped in configuration with one leg thereof slidably and detachably received in said socket and the other leg thereof resiliently engaged against the outer surface of the side wall for holding the saw against the side wall, said socket permitting removal of the clip and placing of the clip on the other side wall.

References Cited in the file of this patent UNITED STATES PATENTS 339,455 Olmsted Apr. 6, 1886 600,905 Beeghly Mar, 22, 1888 727,820 May May 12, 1903 778,178 Dotts Dec. 20, 1904 1,257,099 Nace et al Feb. 19, 1918 1,535,661 Garrity et a1 Apr. 28, 1925

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