Improvements in Contracting and Expanding Cutters for Turning and Facing Bolts, Pins, and the like.
Year: 1891

page_text: Date of Application, 28th Sept., 1891
Complete Specification Left, 25th July, 1892-Accepted, 17th Sept., 1892
'
PROVISIONAL SPECIFICATION.
Improvements in Contracting and Expanding Cutters for Turning
and Facing Bolts, Pins, and the like.
GEORGE WILLIAM DAVIS 7 Thynne Street West Bromwich Staffordshire
Foreman Engineer & Machinist RICHARD SOUTHERTON 92 Gladstone Road
Birmingham Machine Fitter do hereby declare the nature of this invention to be as
follows:-
The particular form of cutter to which we direct our improvement, is that of a
solid cutter having a hole bored axially through it to a given size, for the purpose
of turning & facing cylindrical work, such as bolts or any particular form of
cylindrical pins &c.
The precise nature of our improvement is to slit the said cutter a certain distance
of its length, so as to allow the cutter to be contracted or expanded to any given
size within the range of contraction or expansion of the said cutter.
The outer cutting extremity of the said cutter is coned, and over the cutter is
placed a shell similarly coned, to fit the cone upon the cutter. The other extremity
The shell
of the shell is screwed to fit the collett or holder containing the cutter.
has also a series of apertures cut at intervals through its periphery to allow free
exit of waste turnings.
Upon the periphery of this shell is attached a vernier so as to enable the operator
to guage the amount of contraction or expansion.
The benefit to be derived by the use of such improved form of cutter may be
illustrated thus:-
Having a considerable number of bolts or pins to turn accurately to a given
guage, much delay & inconvenience is caused through the cutters now in use having
to be reheated, contracted, & recut when they have worn too large in the bore,
consequent on successive sharpening of the teeth.
With our improved contracting & expanding cutter the difficulty is at once over-
come. If the cutter is found to be too large or too small in bore it may be quickly
adjusted to a given standard by slightly turning the shell surrounding the cutter
according to the amount of contraction or expansion required.
Given under our hand this 26th day of September 1891.
GEORGE WILLIAM DAVIS.
RICHARD
SOUTHERTON.
COMPLETE SPECIFICATION.
Improvements in Contracting and Expanding Cutters for Turning
and Facing Bolts, Pins, and the like.
GEORGE WILLIAM DAVIS 7 Thynne Street West Bromwich Foreman Engineer
& Machinist & RICHARD SOUTHERTON 92 Gladstone Road Sparkbrook
Birmingham Machine Fitter 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 form of cutter to which we direct our improvement is that of a solid cutter
for the purpose of turning or facing cylindrical work, such as bolts, or any other
particular form of cylindrical pins &c., such cutter having a hole bored axially
through it to a given gauge.
The precise nature of our improvement is to slit the said cutter through a certain

page_text: distance of its length, so as to allow the cutter to contract or expand to any given
size within the range of contraction or expansion of the said cutter.
The outer cutting extremity of the cutter is coned and over the cutter is placed a
shell similarly coned to fit the cone upon the cutter.
The other extremity of the shell is secured to a collett, or holder, containing the
cutter.
The shell has a series of apertures cut at intervals through its periphery, to allow
of free exit of waste turnings and for lubricating purposes.
Upon the periphery of the shell is a graduated scale to enable the operator to
gauge the amount of contraction or expansion.
The expansion in this instance is due to its own elasticity, gained in the hardening
and tempering process, and is caused to act when freed from the outer cone.
Another form of expansion (which is caused to act when the cutter is required to
expand beyond its limit of elasticity) is obtained by extending the collett Â to A'
which is coned to fit a cone in the bore of cutter as shown at A' Fig. 1.
The object of the invention may be seen from the accompanying sheet of
drawings.
A is the collett-A¹ conical end for expanding cutter, B the cone shell for
contracting cutter, C the cutter, D lock nut, E graduated scale, F finger or pointer,
a, a, a are holes for exit of waste, b, b, b, are slits in cutter.
Fig. 2 18 a section on CD'
TA
+
1°
As
ig. 2 18 a section on CD'
section
Fig. 3 is a plan & Fig. 4 end elevation.
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 :-
(1) A solid cutter capable of turning pins of variable diameter by means of con-
tracting and expanding the same.
(2) A cutter having either external or internal cones for the purpose of contracting
or expanding the same, as substantially set forth in our drawings.
Dated this 29th day of June 1892.
GEORGE WILLIAM DAVIS,
RICHARD SOUTHERTON,
Applicants.