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Патент USA US2406531

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I Ami-‘5.211946;
- ~2,40'6,531
Filed March 14, 1945
2 Sheets-Sheet l
Aug. 27, 1946.
'L, A, DAHLE '
7 Filed March>l4, 1945
2-Sheets—Sheet 2
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DA H4 E ’ Y
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Patented Aug. 27, 1946
Lawrence A. Dahle, Marietta, Minn.
Application March 14, 1945, Serial No. 582,703
1 Claim. (Cl. 33-98)
This invention relates to mechanics’ tools and
has for its object to provide means for marking
end cuts of sections for forming arcuate rafters
For a three inch thick rafter there must be three
or other circular work.
Another object of the invention is to provide
layers of the length of the rafter, which requires
a large number of segments to build up, necessi
tating considerable time in marking the two end
cuts of each segment and which is often inac
a square by means of which end cut angles of
curate under present methods, and which often
arcuate members may be instantly determined.
A further object of the invention is to provide
a square having spaced apart depending lobes to
seat upon an arcuate member, a ?xed tongue by 10
results in weak structures. This expensive time
means of which the degree of the arc may be de
termined and a pivoted arm for indicating how
the bevel or splice end cut must be made for
joining such members to continue the same arc.
element can be eliminated with the use of my
above described tool, the use of which is extreme
ly accurate as well as rapid, for in using the
tool it is only necessary to seat the two mem
bers 20 and 2|, upon the outer arcuate edge 29
of a segment 30, as indicated in Figures 3 and 4,
then draw a line 3|, across the edge of the seg
Other features and advantages will become 15 ment along edge I], of member I3, then shift the
more readily apparent from the following de
scription and the accompanying illustrative draw
ings in which:
device to place either edge 32 or 33, of either
or both members ‘25 and/or 26, into alignment
with the line 3I, then set the bevel squares to
that exact angle and the tool is ready for use
Figure l is a plan View of my circle square,
Figure 2 is an edge view thereof,
20 as the device may be placed at the ends of the
segment and the bevel end cut scribed in accord
Figure 3 is an elevational view showing the
ance with either edge of the members 25 and
application of the invention and including a
26. The bevel squares thus set are used con
slight modi?cation, and
tinuously as long as the same arcuate segments
Figure 4 is a similar view indicating a different
25 are to be out.
It is thought that persons skilled in the art
In the following speci?cation and in the ac
to which the invention relates will be able to ob
companying drawings like reference characters
tain a clear understanding of the invention after
indicate like parts and in which I0, is a square
considering the description in connection wtih
so designed that the bevel end cuts of arcuate
segments may be quickly scribed. My device 30 the drawings. Therefore, a more lengthy descrip
tion is regarded as unnecessary.
consists of a straight body member II, of flat
Minor changes in shape, size and rearrange
metal into which is mortised one end I2, of a
ment of details and parts such as come within
right angular arm I3, and held normally seated
the purview of the invention claimed may be re
.by means of a lock nut I4, when in working po
sition, but which may be released to pivot upon 35 sorted to, in actual practice, if desired.
Having now described my invention that which
the member II, for storage purposes. The face
I claim as new and desire to procure by Letters
I5, of said member I3, is marked 01f with lines
Patent is:
I6, indicating various radius circles. The in
A combined square and bevel comprising a
diced edge ll, of this member is exactly centered‘
between the degree marks I8 and I 9, on the semi 40 straight edge body, a blade secured thereto at
right‘angles and formed with a work edge and
circular depending lobes or feet 20 and 2 I, which
are integral with the member II, and project
having circle radius indicia thereon in spaced
from the edge 22, thereof and which are suf
relation, semi-circular positioning feet secured
?ciently spaced apart to seat upon arcuate sur
to the edge of said body at the opposite sides
faces of various degrees without permitting said 45 of said blade having positioning‘ lines formed
edge 22, to come into contact therewith.
thereon parallel with and equidistant from said
work edge, and pivoted bevel squares at the ends
On both ends 23 and 24, of member II, are
pivoted bevel squares 25 and 26, respectively,
of said straight edge body adapted to be shifted
which are adapted to be locked into adjusted po
to have a surface thereof alined with a mark
sition by means of the lock nut 21 and 28.
50 drawn previously along the work edge of said
blade when an arcuate piece of work material
In the construction of buildings requiring arcu
is contacted by said positioning feet, whereby
ate rafters the general practice is to build them
up of segments of one inch board cut in lengths
the correct bevel or angle for the ends of the
applicable to form the required arc, and several
work material may be ascertained.
layers must be secured together, the number of 55
which depending upon the stress to be borne.
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