US715897A - Bevel-square. - Google Patents

Description

No. 75,897.y Patented nee. is, |902.

' E. w.`sTm-:En. l A

BEVEL SQUARE. (Appximion med Jun. so. .19625 maman.)

f ii UNITED' SSTATES PATENT OFFICE.

ERIC W.' STREED, 0F MINNEAPOLIS, MINNESOTA.

Bevat-SQUARE.

SPECIFICATION forming part of Letters Patent No. 715,897, dated December 16, 1902.

Application filed June 20,1902.

To wl whom, it Wawy concern:

Be it known that I, ERIC W. STREED, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Bevel-Squares; 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 saine.

My invention has for its object to provide a bevel-square of improved construction g and to this end it consists of the novel devices and combinations of devices hereinafter described, and dened in the claim.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several.

views. A

Figure l is a plan view, with some parts broken away, showing my improved bevelsquare. Fig. 2 is a side elevation of the same, some parts being broken away. Fig. 3 is a section on the line m3 :r3 of Fig. l, and Fig. 4 is a section on the line x4 x4 of Fig. 3. l

The character a indicates the head of the square,and the character h indicates the blade thereof. The head ais bifurcated or slit, as shown at ct', to afford a seat for the blade b. One prong of the bifurcated portion of the head a is made shorter than the other and is extended by a case-section or housing c, the ange c' of which is rigidly secured to the short prong of said head by screws or other suitable devices.

Working within the casing cis a relatively large gearf and intermeshing pinion j", the former of which is rigidly secured to the pivoted end of the blade l) by screws f2 or other suitable'devices. A pivot is afforded for the gear f and blade h byaclamping-boltg,which works loosely through the hub of said gear and is screwed into the hub 7c of athin plate lc', which is secured by screws or other devices to the long prong of the bifurcated end of the head d, as best shown in'Fig. 3. The clamping-bolt g is preferably provided at its outer end with the shouldered thumb-piece g', which bears against the outer face of the case c. Vhen the clamping-bolt g is tightened, it springs the prongs of the head d toward each other and tightly clamps the pivoted end of the blade b against the long prong of the head o. and tightly pinches the hub of the gearf between the wall of the case c and the nut or hub la, thus securely holding said gear and blade in whatever position they may be set.

The character fm indicates a thin metal plate which is secured to the case c or at least held against rotation with respect thereto and serves to exclude dust from the interior of said case. This dust-guard or plate m completely covers the pinion f', but works loosely in an annular` groove or notch cut in the gear f.

The pinion f is rigidly secured to a short shaft f3, which extends through and is journaled in the wall of the case c, as best shown in Fig.'3. At its outer end the shaft f3 is provided with a dialp, which preferably works in a shallow closely-fitting seat formed in the outer face of the case c. This dial is graduated to indicate degrees, but not, however, actual degrees of angular movement of said dial. To illustrate, the gear fis four times the diameter of the pinion f', and consequently if the said gearfand the blade l) be moved through an arc of ninety degrees the pinion f and dial p will be given four times as much rotary movement-that is, will be given a complete rotation. Now, as ninety degrees is the greatest movement of the blade b which it is necessary to indicate, the dial p is graduated in multiples or fractions of ninety degrees. In this wayauyslight movement of the blade b and gearfwill be multiplied four times on the dial p, and thus, as is evident, a much greater accuracy is obtained than would be obtained by placing the dial on the gearfl or where it would receive direct movement from the blade of the square. For cooperation with the dial p a pointer of some suitablecharacterisprovided. Suchapointer may be afforded by a simple radial mark 1o', placed on the outer face of the case c adjacent to said dial, as shown in Fig. l. Of course it is not necessary that the relation of four to one be maintained between the gears fand f', but it is important in all cases that the rotary movement of the dial p be materially great r than that of the blade b. It

will also be understood that the so called dial might be marked on a relatively Xed ICO part and the so-called pointer be made to move over the same. This Would be simply a reversalof the construction shown and clearly Within the scope of my invention. In this construction it is of course very important that the coperating gears or gear and pinionsquare for use in laying out stairs.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

The combination with the head a, bifurcated at a', of the case c secured to one prong,r

of said head a, the plate 7c secured to the other pron g of said head a and provided with the hub k, the clampingbolt g working through the Wall of said case c and screwed into said hub la, the large gearfloosely mounted on said clamping-bolt, the blade b secured for angular movements with said gear f, the pinion f mounted Within said case and meshing with said gear, the graduated dial p meshing with said pinion f', and a pointer p on the exterior of said ease c, said parts operating substantially as described.

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

ERIC W. STREED.

Witnesses:

ELIZABETH H. KELIHER, F. D. MERCHANT.

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