Improved Adjustable Square and Bevel.
Year: 1890

page_text: Date of Application, 14th Jan., 1890-Accepted, 15th Feb., 1890
COMPLETE SPECIFICATION.
Improved Adjustable Square and Bevel.
We, CHARLES STILWELL of Flagler Street, Morristown New Jersey Mechanic and
ANSON PERRY THAYER of 307 Potter Building New York City United States of
America Patent Agent do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
The invention consists of an adjustable triangular headed bevel, try and tee square,
and spirit level provided with adjusting devices for laying out different angles and
for facilitating the use of the instrument for a plumb and level, and as a radial
square for laying out radial lines on a circular object as hereinafter described and
claimed reference being made to the accompanying drawings in which:
Fig. 1 is a side elevation of our improved bevel square with the blade adjusted as
for laying out both ends of a brace whose angular position is other than 45 degrees
and therefore has different angles of the respective ends.
Fig. 2 is a side elevation of the tool adjusted for certain lines of a hexagonal
figure and with dotted lines indicating another position for the blade.
Fig. 3, is a side elevation of the same adjusted for certain lines of an octagonal
figure.
Fig. 4 represents the tool as a level and a try square.
Fig. 5 represents the tool as
a plumb and an inside square with dotted lines
indicating another position of the blade.
Fig. 6 shows the tool as a mitre square.
Figs. 7 and 8 represent the tool as a tee square and a centre square.
Fig. 9 represents an elevation of the base of the instrument.
Fig. 10 is a sectional elevation of the tool on line x, x, fig. 6, and
Fig. 11 is a detail of the blade binding and controlling device in plan view.
The instrument consists essentially of the triangular head piece a, whose sides b, c,
are forty-five degrees to the base d, and ninety degrees to each other and the thin
metallic blade e, said blade having a slot f, extending nearly its whole length along
the middle and being adjustably secured by the binding screw h, in the slot gr almost
entirely separating the head piece a, into two parts, the blade and the screw being so
fitted that the blade may be shifted along and turned freely on the binding screw
when it is slack and be firmly secured in position when adjusted to the required
position by screwing the binding screw up tight.
This allows the setting and securing of the blade to any desired angle to the
sides b, c, for a bevel as in fig. 1, also for a mitre square as in fig. 6, and also for
various other adjustments of which several others are represented in the different
views.
This binding screw is located in the line of the apex of the two sides of the head
piece perpendicular to the base and its distance from the two sides b, c, at right
angles to them is half the breadth of the blade so that when the blade is turned to
the parallel position with either side an edge forms an extension of the line of said
side as shown in figures 4 and 5.
In one end of the blade is a notch i coincident with the axial line of the slot f, and
tj, is a gauge stud in the line from the apex perpendicular to the base of the head
piece and at k, l, are other gauge studs in lines parallel to the sides b, c, respectively
and passing through the binding screw h. The stud 1, is made in the form of a binding
screw to connect and hold the two parts of the stock together on that side and at
the same time to be removable to allow of shifting the blade around on pivot h, to
the position represented in fig. 8.
It will be seen that by setting the notch i, on these studs respectively before

page_text: tightening up the binding screw controlling the blade by the slot, the blade is
accurately secured in the respective positions figs. 4, 5 and 6 without trouble or care
and in accurate allignment. In fig. 5 however the screw stud is represented as
inserted through the slot of the blade, the blade being shifted along binding screw h,
to the limit permitted by the slot, but of course the notch i, can be set to said stud 1,
the blade being turned the other way, in the same way that it is connected with
studs j and k, figs. 4 and 6 when it may be required.
As in fig. 5 the tool forms a corner square and is also useful as a plumb, but for
the latter purpose it is better with the blade reversed as indicated by the dotted lines
in this figure, then however the tool becomes a try square instead of a
square.
corner
We make the stud only about the height of the thickness of the blade and fit the
blade sufficiently slack in the head piece that the blade may be sprung over and
shifted along the stud for entering the stud in the slot to gauge the blade for the try
square and the tee square and also for a radial or centre square as represented in
figures 7 and 8.
At m, is another stud in such position relatively to binding screw h, and the head
piece that when the notched end of the blade is adjusted thercon as indicated in dotted
lines fig. 2, the tool serves for laying out angles of 105 and 165, to the sides c and b,
of the head piece respectively, and at n, is another gage stud whereon the blade is
adjusted to 1574 degrees to the side c, and 112 degrees to side b, as in fig. 3, this
is useful in laying out octagonal figures.
The blade is made with other notches o, of the notched end, one each side of the
notch i, which being inserted between gage studs j and m, as in fig. 2, fixes the
blade in the angles of 120 and 150 to said sides c, b, respectively for hexagons; at p,
there is a part removed from the base d, in one side of the head piece at the
extremities of which are bearing points g for the edges of a curved piece of work as
a round disk or wheel, said bearing points being equi-distant from the edges, of
the blade when adjusted for a tee square so that it will then serve to lay out radial
lines on such a piece, the periphery of said piece being placed against the bearing
points g:
At t, is a spirit level applied so as to be used with side b, of the head piece as a
base, and with the blade e, as an extension thereof for greater accuracy when adjusted
on gauge stud k, by its notched end as in fig. 4, and it is also adapted for use with
said side b, as a base and with side c, for a plumb line when said side c, is extended
by one edge of blade e, said blade then having its notched end adjusted on the gage
stud 1, as indicated by the dotted lines fig. 5, the instrument is also useful in either of
these conditions for try square.
It will be seen that with these gauge devices for special angles most frequently
required and for prolongations of the sides of the head piece the instrument has a
greater range of usefulness than as heretofore made and the contrivance for radially
lining curved work is an important additional feature of usefulness. An important
advantage of the bevel having the blade pivoted near the apex of a right angular
head piece and being adjustable along the pivot so as to be used in one position with
both sides of the head block, is in the facility it affords of marking two different
angles to a line as y, y, fig. 1, and which are 90 degrees to each other simply by
placing the two sides of the head pieces respectively to said line and without changing
the blade in the head piece, which is especially useful in laying out braces of frame
work which are not to be in angles of 45 degrees.
For a substantial self centering clamping joint at the binding screw h, we make a
conical socket a' concentric with the hole for said screw in one of the parts of the
head piece and provide a correspondingly shaped washer 61 rising slightly above the
surface of said part when placed in said socket and having a tongue piece d' on
the surface fitting the slot of the blade e, between which washer and the other part
of the head piece the blade is bound when screw h, is made tight which also binds the
washer in the socket so that its friction therein, through the tongue d¹ affords
powerful resistance to the turning of the blade in the head piece without having to

page_text: draw the screw very tight and gives stability to the blade when secured in any
position.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed we declare that what we
claim is :-
1st. The combination of the right angled triangular head piece having the medium
slot for the blade nearly separating it into two parts, the slotted blade pivoted together
near the apex of the said angle and the binding screw h, by which they are pivoted
together said blade being adjustable around and along the pivot.
2nd. The combination of the triangular bead piece slotted blade and the binding
screw h, by which they are pivoted together one or more gauge studs of the head
pieces as j, m, n, and the notched end of the blade substantially as described.
3rd. The combination of the triangular head piece, the spirit level arranged on the
inner side of one of the sides of the head piece, and the blade pivoted in the apex of
the head piece and adjustable to and securable in a fixed position with one edge in
alignment with the side of the head piece forming the base of the level for extension
thereof.
4th. The combination of the right angled triangular head piece, the slotted blade
having the notched end and the binding screw h, by which they are pivoted together
near the apex of said angle also the gauge stud k, said stud and the binding screw h,
holding the blade with one edge in line with one side of the head piece, and also the
spirit level located on said side of the head piece as a base for the level substantially
as described.
5th. The combination of the triangular head piece, the slotted blade the binding
screw h, by which they are pivoted together, the gauge studs k, l, respectively with
stud h, parallel to the respective sides of the head piece and half the width of the
blade therefrom, the notched end of said blade and the spirit level substantially as
described.
6th. The combination of the triangular head piece, the slotted blade, the binding
screw h, by which they are pivoted together, and the stud j, in the same line with
the binding screw h, in a line perpendicular to base d, said blade being adjustable
over the top of the stud to engage the stud in the slot and disengage it from the
slot substantially as described.
7th. The combination of the triangular head piece, slotted blade, and the binding
screw h, by which they are pivoted together, the gauge studs j, m, and the notches o,
of the end of the blade adapted to gauge the blade to a predetermined angle by
lodgement of said extension between said studs substantially as described.
8th. The combination of the triangular head piece, slotted blade, the binding
screw h, by which they are pivoted together, the gauge stud j, in the same line with
binding screw h in a line perpendicular to base d, and the bearing points g, equi-
distant from the edges, of the blade substantially as described.
9th. The combination of the conical washer with the blade binding screw and the
slotted triangular head piece, one of the parts of said head piece having a conical
socket concentric with the binding screw substantially as described.
10th. The combination of the conical washer and the tongue piece thereon with
the slotted blade, binding screw and slotted triangular head piece one of the parts of
said head piece having a conical socket concentric with the binding screw substantially
as described.
Doted thin 14th dov of Tonn……… 1900
PHILIP M. JUSTICE,
Associate Agent.