IMPROVEMENTS IN ARRANGEMENTS OR MECHANISM FOR BORING OR TURNING
Year: 1877

page_text: LETTERS PATENT to George Lowry, of Cross Street Iron Works, Salford, in the
County of Lancaster, Engineer, for the Invention of "IMPROVEMENTS IN
ARRANGEMENTS OR MECHANISM FOR BORING OR TURNING."
Sealed the 8th May 1877, and dated the 10th January 1877.
PROVISIONAL SPECIFICATION left by the said George Lowry at the Office of
the Commissioners of Patents on the 10th January 1877.
GEORGE LOWRY, of Cross Street Iron Works, Salford, in the County of Lancaster,
Engineer "IMPROVEMENTS IN ARRANGEMENTS OR MECHANISM FOR BORING OR
TURNING."
The object of my Invention is an arrangement of mechanism for boring or
turning conical or curved holes or surfaces, which apparatus can be used in the
lathe, or in radial or other drilling arrangements, and my Invention consists of a
tubular boring bar formed at one end to be rotated by the lathe or drill spindle, and
having an enlarged boss at the other end in a hole, across which at a right angle to
the axis of the tubular bar a tool holder is fitted to slide; this holder carries the
cutter or tool which can be adjusted in the tool holder and secured by a screw.
The tool holder has a slot in it for a flat bar to slide through, this bar passing into
the hollow of the tubular bar and fitting accurately therein. In the bar a slot is
made which for forming conical holes or surfaces is made in a diagonal direction in
the lengthway of the bar, but for forming curved holes or surfaces the slot is made
to the curve required. When this shaper bar is passed through the slot in the tool
holder, a pin is passed through the side of the enlarged boss at the end of the
tubular bar, and through a hole in the tool holder and through the long slot in the
shaper bar.
If the shaper bar is held stationary and the tubular bar is slided up and down it,
the tool holder will be drawn in and out accordingly, the proportionate extent of
movement depending upon the shape or inclination of the slot in the shaper bar.
When this apparatus is used in drilling machinery the end of the tubular bar is
secured in the drill spindle so as to be rotated like a drill, and the outer end of the
tubular bar is passed through a stay under the article to be operated upon, and the
cone point of the shaper bar rests upon the stay, or its cone point may rest upon
Posing GI

page_text: the centre hole in the head or end of an adjustable set screw, and when the
apparatus is thus adjusted, the hole is made by bringing down the drill spindle as
in drilling.
In boring conical holes the cutter may commence at the largest, and end at the
smallest diameter of the hole, or, vice versa, it is only necessary to reverse the shaper
bar from one side to the other to make a diminishing or enlarging hole as required.
In some cases the outer end of the shaper bar may act upon a screw to rotate,
and thus change the position of the shaper, or other arrangements may be used to
move the shaper for forming enlargements of holes, having the same diameter at the
two ends, and for other purposes.
.
In boring in the lathe one end of the tubular bar may be secured in the lathe
spindle and the article may be secured to the slide carriage, the cone point of the
shaper bar resting or being held against a stay secured upon the slide carriage. Or
the boss for the tool holder may be placed in the middle of a tubular bar which may
have a longitudinal slot in it, so that the shaper bar in the hollow of the tube may
be connected with an external collar, the sliding of which to and fro will actuate
the shaper; the end of the tubular bar may be closed in this case by a plug, and the
bar may then be placed between the centres in the lathe.
In some cases the shaper bar may be made with its sides tapering from the
middle to its two ends, which may have caps in which the ends may be adjusted to
vary the inclination of the slot in the shaper.
The shaper in some cases may be formed by a straight bar secured to the flat side.
of an half round bar, one side of the tool holder within the boss being cut away.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said George Lowry in the Great Seal Patent Office on the 5th July 1877.
GEORGE LOWRY, of Cross Street Iron Works, Salford, in the County of Lancaster,
Engineer. "IMPROVEMENTS IN AGREEMENTS OR MECHANISM FOR BORING OR
TURNING."
The object of my Invention is an arrangement of mechanism for boring or
turning conical or curved holes or surfaces, which apparatus can be used in the lathe
or in the radial or other drilling arrangements, and my Invention consists of a
tubular boring bar formed at one end to be rotated by the lathe or drill spindle, and
having an enlarged boss upon it, in a hole across which at a right angle to the
axis of the tubular bar a tool holder is fitted to slide; this holder carries the cutter
The tool
or tool which can be adjusted in the tool holder and secured by a screw.
holder has a slot in it for a flat bar to slide through, this bar passing into the
hollow of the tubular bar and fitting accurately therein. In the bar a slot is made
which for forming conical holes or surfaces is made in a diagonal direction in the
lengthway of the bar, but for forming curved holes or surfaces the slot is made in
the bar to the curve or other shape required. When this shaper bar is passed
through the slot in the tool holder, a pin is passed through a slot in the side of the
enlarged boss in the tubular bar, and through a hole in the tool holder and through
the long slot in the shaper bar.
If the shaper bar is held stationary and the tubular bar is slided up and down it,
the tool holder will be drawn in and out accordingly, the proportionate extent of
movement depending upon the shape or inclination of the slot in the shaper bar.
When this apparatus is used in drilling machinery the end of the tubular bar
is secured in the drill spindle so as to be rotated like a drill, and the outer end of
the tubular bar may be passed through a stay under the article to be operated
upon, and the cone point of the shaper bar rests upon the stay, or its cone point
may rest upon the centre hole in the head or end of an adjustable set screw, and
when the apparatus is thus adjusted the hole is made by bringing down the drill
spindle as in drilling.

page_text: In boring conical holes the cutter may commence at the largest and end at the
smallest diameter of the hole, or, vice versa, it is only necessary to reverse the shaper
bar from one side to the other to make a diminishing or enlarging hole as required.
In some cases the outer end of the shaper bar may act upon a screw to rotate,
and thus change the position of the shaper, or other arrangements may be used to
move the shaper for forming enlargements of holes, having the same diameter at the
two ends, and for other purposes.
In boring in the lathe one end of the tubular bar may be secured in the lathe
spindle and the article may be secured to the slide carriage, the cone point of the
shaper bar resting or being held against a stay secured upon the slide carriage. Or
the boss for the tool holder may be placed about the middle of a tubular bar which
may have a longitudinal slot in it so that the shaper bar in the hollow of the tube
may be connected with an external collar, the sliding of which to and fro will
actuate the shaper; the end of the tubular bar may be closed in this case by a plug,
and the bar may then be placed between the centres in the lathe.
In some cases the shaper bar may be made with its sides tapering from the
middle to its two ends which may have caps in which the ends may be adjusted to
vary the inclination of the slot in the shaper.
The shaper in some cases may be formed by a straight bar secured to the flat side
of an half-round bar, one side of the tool holder within the boss being cut away.
Fig. 1 is a longitudinal section through the axis of the tubular bar and tool
holder, and Fig. 2 is a longitudinal section also, through the axis of the tubular bar,
but taken at a right angle to the section shown by Fig. 1, and Fig. 3 is a cross
section taken through the axis of the tool holder in a plane perpendicular to the
longitudinal axis of the tubular bar, these Figures illustrating one modification of
my Invention.
a is the tubular bar with an enlarged boss a¹ near the middle of it
through which there is a hole at a right angle to the longitudinal axis of the tubular
bar for the tool holder b which can slide in; in the hole-c is the cutter secured in a
hole in the holder by a screw b¹; the tool holder has a slot in its axis for the shaper
bar d to pass through (see Fig. 3); this bar d has a slot d' in it, and when the shaper is
inserted in the tubular bar and passed through the slot in the tool holder, a pin b is
passed through a hole in the holder and shaper slot, there. being slots in the
enlarged boss a¹ to admit of the required movement in the pin 62 (see Figs. 1 and 3).
The shaper bar d fits accurately in the tubular bar a, and the pin 62 fits in the slot
in the shaper and hole in the tool holder b. The outer ends of the shaper d is
pointed to rest in a centre hole in a table or support when in use. The upper end
of the tubular bar is closed with a plug a², and this end is fixed in the drill or lathe
spindle when the boring bar is in use; x is an article supposed to be under
operation of being bored with a conical hole.
Fig. 4 is a longitudinal section of a boring bar similar to that shown by Figs. 1, 2,
and 3, except that the shaper bar d has a slot d' in it for boring out a conical
recessed hole, as illustrated by x.
Figs. 5, 6, and 7 are views corresponding respectively to Figs. 1, 2, and 3, but
illustrating another modification of my Invention. The slot is made in a shaper
bar d tapering from its middle to its two ends which are each connected to a
block (d) by a pin (d³), as shown. The blocks are fitted to slide in the ends of
bars or parts d and d³, fitting the interior of the tubular bar as shown, and there is
a screw d in each block, the point and head of which is rounded to the circle of the
interior diameter of the tube, and thus just fits across it. By means of these
screws do the angle of the shaper bar d may be brought to the inclination shown in
Fig. 5, or it may be brought to any less inclination than that shown, until in a line
parallel with the longitudinal axis of the tubular bar a. The tool holder b is
slotted so that it may be drawn entirely out or replaced in the hole in the enlarged.
boss a when the pin 62 is removed (see Fig. 7), and, when the tool holder 6 is
withdrawn, the screws de may be adjusted by a screw driver passed into the hole
for the tool holder, the shaper bar being slided to bring the screws opposite the hole
while being adjusted. The adjusting screws de may be passed directly through the

page_text: ends of the shaper bar, there being a pin similar to (d³) to slide in a cross slot in
the bar or part d* and d³.
Fig. 8 is a longitudinal section of a tubular boring bar supposed to be placed
between two centres e of a lathe, as both ends of the bar are supposed to close by
a plug a², as shown; there is a collar a³ which can slide on the bar, having through
it a screw at that passes through a slot in the lengthway of the bar a into the block
or bar d connected with the shaper bar d which is similar to that shown by
Figs. 5, 6, and 7. The article x to be operated upon is supposed in this case to be
secured on a slide carriage so as to be traversed the lengthway of the boring bar,
and a stay upon the carriage is supposed to be connected with the warf on the
collar a³ so as to allow it to rotate, but to move the collar, and thus the shaper bar
along with the carriage.
I have now particularly described my Invention and the mode of carrying it into
effect, and claim as my Invention the combination of a tubular and shaper bar and
tool holder for boring or turning, substantially as herein-before described and
illustrated by the Drawings.
In witness whereof, I, the said George Lowry, have hereunto set my hand
and seal, this Twenty-second day of June, in the year of our Lord One
thousand eight hundred and seventy-seven.