A New or Improved Expansive Boring Bar and in Apparatus connected therewith.
Year: 1899

page_text: Date of Application, 8th June, 1899
Complete Specification Left, 7th Mar., 1900-Accepted, 14th Apr., 1900
PROVISIONAL SPECIFICATION.
A New or Improved Expansive Boring Bar and in Apparatus
connected therewith.
We, JOHN BROWN, of 8, Hartley Street, Machinist, and THOMAS HADDOCK, of
80, Kay Street, Fitter, both of Bolton, in the County of Lancaster, do hereby
declare the nature of our said invention to be as follows:-
-
This invention refers to a new or improved expansive boring bar and in
apparatus connected therewith and is applicable for lathes, horizontal and ver-
tical boring machines, drilling machines, and the like, and consists in provid-
ing means whereby the adjustable metallic cutters may be regulated to the
greatest nicety with a minimum of labor. This we carry into effect by means
of a bar provided with openings or slots in which are disposed suitable cutters
which can be adjusted or regulated and expanded as desired by means of a cone
on the end of an operating screw: the latter being provided with means for
locking the same. The cutters are provided with pins or projections which fit in
slots to prevent turning and maintain an uniform moving position of the said
cutters. Springs are provided for the purpose of contracting or moving the
cutters in an inwardly direction.
Dated the 7th day of June 1899.
EDMUND CHADWICK,
Agent.
A New or Improved Expansive Boring Bar and in Apparatus
connected therewith.
We, JOHN BROWN, of 8, Hartley Street, Machinist, and THOMAS HADDOCK, of
80, Kay Street, Fitter, both of Bolton, in the County of Lancaster, do hereby
declare the nature of our said invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
This invention refers to a new or improved expansive boring bar and in
apparatus connected therewith and is applicable for lathes, horizontal and ver-
tical boring machines, drilling machines, and the like, and consists in provid-
ing means whereby the adjustable metallic cutters may be regulated to the
greatest nicety with a minimum of labor. This, we carry into effect by means
of a bar provided with openings or slots in which are disposed suitable cutters
which can be adjusted or regulated and expanded as desired by means of a cone
on the end of an operating screw; the latter being provided with means for
locking the same. The cutters are provided with pins or projections which fit in
slots to prevent turning and maintain an uniform moving position of the said
cutters. Springs are provided for the purpose of contracting or moving the
cutters in an inwardly direction.
DESCRIPTION OF DRAWINGS.
Fig. 1 is a longitudinal side view of our new or improved expansive boring

page_text: bar for vertical boring and drilling machines-Fig. 2 a longitudinal plan of
Fig. Fig. 3 a transverse section through line A B in Fig. 1-Fig. 4 an outside
end view of Fig. 2-Fig. 5 a longitudinal side view of our invention applied
to a boring bar applicable for lathes, horizontal and vertical boring machines
and the like-Fig. 6a longitudinal plan of Fig. 5,--Fig. 7a transverse section
through line C D in Fig. 5, and Fig. 8 a plan of specially formed key or spanner.
In all the figures the same letters are employed to indicate corresponding parts.
E represents a boring bar: G cutters; H cone; I.operating screw: J spring
for contracting or moving cutters, in an inwardly direction; K nut for locking
operating screw, and L setting or locking screws for cutters.
The boring har E is provided with openings or slots in which are disposed the
cutters G which are adjusted or regulated and expanded as desired by means of
the cone H on the end of the operating screw I: the latter being locked in
position by means of the nut K. The cutters G are provided with the pins or
projections M connected by means of the spiral spring J for the purpose of con-
tracting or moving the cutters G in an inwardly direction when the inner edges
are released from the setting action of the conical end H on the inner end of the
operating screw I. After the cutters G have been set to the desired position
according to the diameter of the hole to be bored they are secured or locked by
the setting screws L. In the boring bar E for horizontal and vertical boring
machines and the like shown in Figs. 5, 6 and 7 the cone H is mounted in the
screw N and is actuated by the screw for adjusting the cutters G. The screw N
is provided with the holes P to allow of the same being operated by means of a
specially formed key or spanner as shown in Fig. 8; the prongs R fitting into the
holes in the outer end of the screw N.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. The general arrangement construction and combination of parts composing
the new or improved expansive boring bar and apparatus connected therewith
for vertical boring and drilling machines and the like consisting of the boring
bar E provided with openings or slots in which are disposed the cutters G, the
latter being operated in one direction by the cone H and operating screw I, and in
a reverse direction by the spiral spring J when released from the action of the
cone H and the screw I, together with the means for locking the same after the
cutters G have been set to the desired position according to the diameter of the
hole to be bored, the whole being constructed, applied, and operating substan-
tially as described and as illustrated in the drawings in Figs. 1 to 4 inclusive.
2. The general arrangement construction and combination of parts composing
the new or improved expansive boring bar and apparatus connected therewith
applicable for lathes, horizontal and vertical boring machines and the like con-
sisting of the boring bar E, provided with openings or slots in which are disposed
the cutters G, the latter being operated in one direction by the cone H mounted
in and carried by the screw N actuated by the operating screw 0, and in a
reverse direction by the spiral spring when released from the action of the
cone H, together with the means for locking the same after the cutters G have
been set to the desired position according to the diameter of the hole to be bored.
the whole being constructed, applied, and operating substantially as described and
as illustrated in the drawings in Figs. 5 to 7 inclusive.
Dated the fith day of March 1900
EDMUND CHADWICK,
Agent.