A NEW AND IMPROVED METHOD IN MARKING KEY-GROOVES, APPLICABLE FOR FASTENING WHEELS, CRANKS, DISCS, ETC., TO THEIR AXLES, AND THE TOOLS EMPLOYED THEREFOR."
Year: 1881

page_text: LETTERS PATENT to Julius Roemmele, of Glasgow, in the County of Lanark,
North Britain, for an Invention of "A NEW AND IMPROVED METHOD IN
MARKING KEY-GROOVES, APPLICABLE FOR FASTENING WHEELS, CRANKS,
DISCS, ETC., TO THEIR AXLES, AND THE TOOLS EMPLOYED THEREFOR."
PROVISIONAL SPECIFICATION left by the said Julius Roemmele at the
Office of the Commissioners of Patents on the 14th November 1881.
JULIUS ROEMMELE, of Glasgow, in the County of Lanark, North Britain.
"A NEW AND IMPROVED METHOD IN MARKING KEY-GROOVES, APPLICABLE FOR
FASTENING WHEELS, CRANKS, DISCS, ETC., TO THEIR AXLES, AND THE TOOLS
EMPLOYED THEREFOR."
This Invention relates to improvements in the method of marking out the key
grooves which are necessary for fastening whee's, cranks, etc., to their axles; and
the objects of these improvements are, first, to find by means of convenient tools
the line crossing the centre of the axle hole, and to mark out by means of another
tool on both sides of such centre line the key groove corresponding with the
diameter of the shaft or axles to be fastened.
Figure 1 of the accompanying Drawing is a plan of the centre rulo; Figure 2, a
side elevation thereof; and Figure 3 shows the use of the centre rule; Figure 4 is
a plan of the key groove pattern; Figure 5, a side elevation thereof; and Figure 6
shows the application of such pattern.
The rule a is fixed between the two squares band b' in such a manner that it
forms a right angle with them, and its one edge e is exactly at the same distance
from the end points x and y, x and y¹ of b and b'. By laying the rule a on &
nave of a wheel, disc, crank, etc. in such a way as to touch with the points x and y,
or (according to the diameter of the axle hole) with the points x and y¹ the inner
circumference of the axle hole, the edge e must pass exactly through the centre of
[Price 6d1

page_text: the bore; in consequence any line drawn on the edge e is a radius of the centre of
the bore.
After marking such a radial line drawn from any point desired the pattern c
may be applied to show the correct form of the key-groove. This pattern is fixed
to a cross piece d in the shape of a T square, leaving the same distance on both
sides between the adjacent edge of the pattern; the line parallel to the long
edges divide the pattern in two equal parts. By putting the pattern c on the nave
in such a manner as to touch by the end points of d the periphery of the boring,
and to bring the line fon the line drawn on the edge e of the rule a, the place
where the key-groove is to be cut out will be indicated by that part of the pattern c
which lays on the nave, and may be marked out in the usual manner by tracing
around its edges.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Julius Roemmele in the Great Seal Patent Office on the 13th May
1882.
JULIUS ROEMMELE, of Glasgow, in the County of Lanark, North Britain.
A NEW AND IMPROVED METHOD IN MARKING KEY GROOVES, APPLICABLE FOR
FASTENING WHEELS, CRANKS, DISCS, &C., TO THEIR AXLES, AND THE TOOLS
EMPLOYED THEREFOR."
This Invention relates to improvements in the method of marking out the key
grooves which are necessary for fastening wheels, cranks, etc., to their axles, and
the objects of these improvements are, first, to find by means of convenient tools
the line crossing the centre of the axle hole, and to mark out by means of another
tool on both sides of such centre line the key groove corresponding with the
diameter of the shaft or axles to be fastened.
Figure 1 of the accompanying Drawing is a plan of the centre rule with a single
cross piece, and Figure 1ª of one with a double cross piece; Figures 2 and 2ª are
side elevations thereof; and Figure 3 shows the use of such a centre rule; Figure 4
is a plan of the key-groove-pattern; Figure 5, a side clevation thereof; and Figure 6
shows the application of such pattern.
The rule anay be fixed either to a curved cross piece B or between the two
squares band in such a manner that it forms a right angle with them or with a
line drawn through the points X and Y, and its one edge c is exactly at the same
distance from the end points X and Y of B, or x and y, al and y' of b and b¹. By
laying the rule a on the nave of a wheel, disc, crank, etc., in such a way as to touch
with the points X and Y, and by the double rule x and y, or (according to the
diameter of the axle hole) with the points x and y the inner circumference of the
axle hole, the edge e must pass exactly through the centre of the bore; in con-
sequence any line drawn on the edge e is a radius of the centre of the bore.
After marking such a radial line drawn from any point desired the pattern c
may be applied to show the correct form of the key-groove. This pattern is fixed
to a cross piece d in the shape of a T square, leaving the same distance on both
sides between the adjacent edge of the pattern; the line parallel to the long
edges divide the pattern in two equal parts. By putting the pattern c on the navo
in such a manner as to touch by the end points of d the periphery of the boring,
and to bring the line on the line drawn on the edge e of the rule a, the placo
where the key-groove is to be cut out will be indicated by that part of the
pattern which lays on the nave, and may be marked out in the usual manner by
tracing around its edges.
Having thus fully described my Invention, what I desire to claim and secure by
Letters Patent is,-
1. The method of pointing out and marking key-grooves on naves of wheels,
dises, cranks, etc., substantially as described.
2. The combination of the rule a with the cross piece B, substantially as set
forth and for the purpose specified.
3. The combination of the rule a with the cross pieces and b', substantially as
set forth and for the purpose specified.
4. The combination of the pattern c with the cross piece d, substantially as and
for the purpose specified.
In witness whereof, I, the said Julius Roemmele, have hereunto set my
hand and seal, this Sixth day of May, in the year of our Lord One
thousand eight hundred and eighty two.
JULIUS ROEMMELE. (L.S.)