US278405A - James b - Google Patents

Description

(N0-Model.)

vJ. B. GUMMING xv B. F. VAN AMRINGE.

CARP'BNTBS BEV'EL.

No. 278,405. Patented May 29,1883.

N. PETERS. Pmwumagnpher. wnmgw". n.0,

i' k UNI-.TEDSTATES t. PATENT OFFICE.

y JAMEs E. eUMMrNaAND BENJAMIN tE. -VAN AMEINGE, 4or OAKLAND, UAL.

i oARPENTi-:Rs BEVEL.

sPEcIFrcA'rIoN forming part of Letters` Patent No. 278,405, dated May 29, 1883,.

Application led February 27, 1883. (No model.)

` To all whom it may concern:

we hereby declare the following to be a full,

` clear, and exact description thereof.

Our invention relates to thatclass of carpenters instruments or toolsknown as bevel- `squares and "it consists in a blade pivoted in each end of the slotted stock and in the formation of the ends of said blades, all of which a will hereinafter fully appear.

The object of our invention is to combine in one instrument two blades so formed and ca.

p pable of such adjustment as to answer every B B inclosing a right angle.l Fig. 3 is a trans-y verse section through the stock A, where the bolt c passes through. y

Let A represent the stock, formed of two separate pieces held apart to form the slit a by means of the beveled plates b, secured to an i y r opposite end of each and the blades.

B represents one, of the blades, and B' the other. These are each slotted, as shown, throughout their length, and are-pivoted in the "l .l 1 ends of the stock-'one above and then other below the plates b-'by the following means:

'Passing through both partsV of the stock,

through-holes in plates b and through the slots "in the blades, is a bolt, c, having a conical head,

p c", countersunk in one of the parts. Its other end is pivoted eccentrically to the round head or bearing cl of the thumb-lever e, lying upon the other part. Now, it will be seen that when l i, the thumblever is thrown up the bolt is loosened and when pressed down it is tightened, thus relieving or clamping the twoI parts of the stock, so as to loosen or set either of the y blades with the same effect as if the ordinary clamping orset screws were used. One end of `each of the blades is cut on the bevel, as usual, while the other end of each is cut down to a 5c point, the edges forminga perfect square.

The places in which an instrument of this character maybe used are numerous, and need no otherbreference than a single examplethat of laying out rafters where thefoot has to be cut on a greater bevel than the top. In such a case one of the blades may be set to one angle and the other to another angle, thus avoiding the necessity'of two separate instruments or the unadvisablechanging of a single one. When necessary both blades may be set to thev same angle, and thus form parallel bev` els with greater certainty than if two separate instruments wereused. The object in cutting the ends of the blades to form asquare is, first, to allow them to enter corners with more faicility than if rounded, as is usually done; second, to use the ends to indicate a perfect square when necessary; and, lastly, the more important object of forming a perfect squaringinstrument by the use of both blades, as shown in Fig. 2. This is done by bringing the edges of "the ends together Hush, in which position these edges, forming part of a right angle themselves, necessarily include a right angle when broughttogether, as shown.

This square thus formed vis true, requiring no other calculation than the placing together of the two edges. pushed in they occupy'but a small space, one lying above the other, andthe instrument is just as convenient in this respect as the ordinary single-blade tool.y

Although we have here shown the bolt asa means for setting the blades, we could use the ordinary clamp-screw, if` desired.

Weare aware that it is not new to place tw separate bevelblades in one handle but, as far as we know, in theonlyinstanee in which this has been done both blades were pivoted in the same end of the stock. This necessiA tated peculiar mechanism to insure their sepaA rate adjustment, which is not needed by having a blade at each end. Again, such a tool could not be used for laying off parallel. bevels, and there would be the constant tendency for one blade to interfere with the other.

Having thus described our invention, what we claim as new, and desire to secure by Let- 1. In a carpenters bevel, a stock or handle When the two blades are IOG slotted stock A, in combination with the acljustable blades B B,'having each a beveled end and pivoted in parallel planes in opposite ends of the stock, substantially as herein described.

3.' In a earpenters bevel, the slotted stock A, in combination with the adjustable blades B B', having each a beveled end'and an end 4eut to a point to form arightangle, said blades being pivoted in opposite ends of the stock, substantially as herein described.

In witness whereof We hereunto set our hands.

JAMESLB. CUMMING. BENJAMIN F. VAN AMRINGE. Witnesses:

S. H. NOURsE,

J. H. BLOOD.

Images