US1006948A - Miter-gage. - Google Patents

Description

O. H. JOHNSON.

' MITER GAGE.

APPLIGATION FILED JULY 26,1910.

Patented Oct. 24, 1911.

v 5 WITNESSES g/VENTOR X7 BY 1 WWXW/ W ATTORNEY COLUMBIA PLANOORAPH c0" WASHINGTON, D. c.

CARL H. JOHNSON, 0F SPOKANE, WASHINGTON.

IVIITER-GAGE.

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Specification of Letters Patent.

Patented Oct. 24, 19111.

Application filed July 26, 1910. Serial No. 573,842.

To all whom it may concern:

Be it known that I, CARL H. JoHNsoN, a

citizen of the United States, residing at Spokane, in the county of Spokane and State of Vvashington, have invented certain new and useful Improvements in Miter- Gages; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to miter gages, and has for an object to provide a gage for cutting both ends of a leg, strut, or trestle brace to the proper angle to properly engage a mortise irrespective of the length of such leg.

In carrying fiumes, trestles, or the like over uneven country the supporting legs or struts are required to be of different lengths to compensate for different altitudes of the ground, and it has been found difiicult to produce the proper miter at the ends to always support the flume, trestle, or the like at the proper altitude and yet always properly' fit the mortise produced to receive it.

The present invention has for a further object to provide a staff adjustable longitudinally to the length required as a vertical from the fiume to the ground, and with the proper perpendicular straight edges attached thereto adapted to mark for forming the opposite ends of the legs, and also to determine the proper angle.

With these and other objects in view the invention comprises certain novel constructions, combinations, and arrangement of parts as will be hereinafter more fully de scribed and claimed.

In the accompanying drawings: Figure 1 is a view in side elevation of the entire device shown in connection with a conventional flume and one leg. Fig. 2 is a view of the device in edge elevation. Fig. 3 is an enlarged View in side elevation of the adjustable gage portion.

Like characters of reference designate cor responding parts throughout the several views.

A staff shown as a whole at A is made up respectively of the sections 10 and 11 joined to slide longitudinally relative to each other, and provided with means, as clips 12, to permit such sliding movement and to secure the sections in rigid adjusted position. The adjustment referred to is for the purpose of securing a length equal to the vertical distance between the fiume the bottom of which is shown conventionally at 13 or other supported structure and the base or supporting member 14 which is a timber lying on the ground or otherwise supported as a base. The timber 14 extends transversely of the flume 13, or is placed in any other applicable position.

Carried rigidly by the staff A are straight edge members 15 and 16 respectively at the bottom and adjacent the top of the staff A, whereby marks may be produced when the 'staif is adjusted to mark the exact measure between the members 13 and 14.

Pivoted upon one side of the staif A, as at 17, is a straight edge member 18 having a segment 19 pivotally connected therewith and adjustably secured to the staff A by any approved means, as a thumb screw 20. The staff A also carries an index member 21 by which the angular relation of the straight edge member 18 to a vertical as indicated by the staff A is determined.

In operation the straight edge member 18 is set at the angle required for the legs or struts of the supported structure, indicated at Fig. 1 as the legs B, and the staff A is adjusted between the members 13 and 14. The angularity of the straight edge member 18 is determined by the angular position of the necessary mortise produced in the supported structure and with the parts adjusted as shown at Fig. 1, the organized structure which forms the subject-matter of this application is laid upon the timber from which the leg or strut is to be cut so that the straight edge member 18 is against the side of such timber when the exact conditions of the cut for the top and bottom of the strut or leg B will be determined respectively by the top and bottom straight edges of the straight edge members 15 and 16.

It is well known that in erecting structures such as fiumes, trestles and the like, the same angularity of the legs or struts is employed throughout the length of the structure irrespective of the vertical height of the supported structure, and that the length of the legs or struts for supporting such structure varies as the vertical height of the supported structure above the ground. It being determined then the exact vertical height of the supported structure above the ground or supporting member represented by 14, the staif A is adjusted so that the interval between the upper straight edge of the member 16 and the lower straight edge of the member 15 coincide exactly with the elevation of the supported structure. The interval then between such upper and lower straight edges and along the straight edge 18 will be the exact length for cutting the supporting leg or strut.

What I claim is:

A miter ga 'e comprising a longitudinal adjustable sta with straight edge members on one side and on opposite ends thereof,

extending over the segment.

In testimony whereof I affiX my signature in presence of two witnesses.

CARL H. JOHNSON. \Vitnesses J. L. CRUsE, O. A. ALEXANDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.

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