Year: 1887

page_text: Date of Application, 10th Dec., 1887
Complete Specification Left, 10th Sept., 1838
Complete Specification Accepted, 30th Nov., 188>
RESERVE CA
1. MANASSAH GLEDHill, Director of Sir Joseph Whitworth & Co. (Limited), of
Openshaw, Manchester, in the County of Lancaster, Engineers, do hereby declare the
nature of this invention to be as follows:-
My invention relates to machines or apparatus chiefly designed for boring steel and
other tubes to be used in the construction or building up of ordnance.
The said apparatus is capable of boring either taper or parallel, but its chief
advantage arises from the facility it affords for accurately boring tubes taper at any
required angle; also for boring tubes irregularly or with shoulders, enlargements or
other variations of diameter.
My improved apparatus comprises a boring-bar which is mounted adjustably in
suitable bearings or supports, but which is not designed to rotate. This bar is pro-
vided with a boring-tool or cutter so arranged that its cutting end projects from one
side of the said bar. The said apparatus, moreover, comprises means for supporting
the tube and rotating it while the boring tool is passing longitudinally through and
cutting the same.
In the boring of long tubes as heretofore practised, great difficulty has been
experienced in consequence of the deflection of the bar, but, by having the too!
arranged on one side of a bar which does not rotate, I am enabled to avoid all
difficulty arising from this cause, as the deflection of the bar, in this case, will not
materially alter the distance of the cutting edge of the tool from the centre of the tube
being operated upon.
The boring-bar is supported in two adjustable and swivelling slides which allow the
said bar to be set to any desired angle, and also permit its adjustment to or from the
centre of the work according to the diameter of the bore. For boring long tubes I
prefer that the boring-bar should be made as large in diameter as the bore of the tube
will permit, so as to give it the greatest possible rigidity. The said bar is in some
instances round, and in other instances square, or approximately of either shape in
transverse section. The tool is, in some cases, set in a cutter-head fitted to slide

page_text: along the bar and fed forward by a screw or other suitable means.
Or 1 fix the tool
in the bar and attach the ends of the said bar to travelling saddles; or I use a screw
or other means for moving it longitudinally through the tube.
At the centre of the bed is a headstock provided with means for griping and
rotating the tube. In the case of long tubes I prefer that they should be supported in
stays at both ends.
The adjustable swivelling slides which I employ for supporting the boring-bar are
conveniently and advantageously constructed as follows, viz. :-A base-plate is
arranged to slide longitudinally upon the bed of the machine and has formed in it
circular or segmental slots. A swivelling block or piece is placed upon this base-
plate and is provided with screw-bolts which are passed through the said segmental
slots and are furnished with nuts whereby the said swivelling block can be firmly
secured in any position to which it may be adjusted. Upon the said swivelling
block is placed a bearing or support for the boring-bar. This bearing or support is
provided with a cap or cover for holding down the bar, and is so arranged that it can
be moved or adjusted upon the said swivelling block transversely to the bed of the
machine. For this purpose the said bearing or support is formed with elongated
slots through which are passed the bolts for securing it to the said swivelling block.
Adjusting screws are preferably provided whereby the position of the bar can be
accurately determined.
For forming curves, bevels, shoulders or other variations or irregularities of
diameter in the bore, I provide one or both ends of the bar or the machine with a
pattern or device which causes the boring tool to follow a path corresponding with
the variations or irregularities to be formed in the bore.
Dated this 10th day of December 1887
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: Improvements in Boring machines.
1, MANASSAH GLEDHILL, Director of Sir Joseph Whitworth & Co., Limited, of
Openshaw, Manchester in the County of Lancaster, Engineers, 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 :-
My Invention relates to a machine or apparatus chiefly designed for boring steel
and other tubes to be used in the construction or building-up of ordnance.
The said machine or apparatus is capable of either taper or parallel boring, but its
chief advantage arises from the facility it affords for accurately boring tubes taper
to any required angle, and also for boring tubes irregularly or with shoulders,
enlargements or other variations of diameter.
In the accompanying Drawings
Figure 1 is a plan partly in horizontal section, some of the parts being removed.
Figure 2 a front elevation partly in vertical central section, and
Figure 3 an end elevation, showing one form of my improved apparatus.
Figure 4 is a transverse section on the line x, x, Figures 1 and 2.
Figure 5 is a plan partly in horizontal section, some of the parts being removed.
Figure 6 a front elevation, and
Figure 7 an end elevation drawn to an enlarged scale, illustrating a modified
arrangement of the said apparatus.
Figure 8 is a transverse section on the line a¹, x1, Figures 5 and 6, drawn to the
same scale as Figure 7.
Figure 9 is a plan.
Figure 10 a side elevation, and
Figure 11 a transverse section on the line ², 2, Figure 10, illustrating a further
modification of my Invention.
Figure 12 is an end elevation, showing an indicator hereinafter described.
Like letters indicate corresponding parts throughout the Drawings.
One very important feature of my Invention is the employment of a non-rotative
boring-bar supported in bearings which are adjustable longitudinally, transversely
and angularly for the purpose of adapting the machine to different sizes and to varying
angles in boring the tubes.
a is the boring-bar which is mounted in bearings or supports 6 so that it can slide
longitudinally therein, but which is not designed to rotate. The bearings have
suitable caps or covers b¹.
In the apparatus shown in Figures 1 to 4, each of the bearings b is supported upon
a swivelling block e and is secured thereto by means of screw-bolts or studs c passed
through slots 6 in the base of the said bearing. The block is provided with pro-
jections or lugs c² through which are formed screw-threaded holes for the reception of
screws whereby the bearing b may be moved or adjusted upon the said block
transversely to the bed of the machine. The said block c rests upon a slide or
carriage e, which is supported upon the said bed and is secured thereon by means of
screw-bolts e', the heads or the nuts of which are fitted in longitudinal grooves in the

page_text: bed so that the said bolts can be moved along therein to alter the position of the
bearing upon the said bed. The slide or carriage e is formed with circular or
segmental slots through which are passed the bolts e³ for securing the block c
thercon.
It will, therefore, be seen that the bearings are capable of longitudinal adjustment
upon the bed of the machine to suit the varying lengths of the tubes to be bored,
and are also capable of lateral and angular adjustment to accurately determine the
position of the boring-bar relatively to the work, and to vary the angle of the bore in
taper work.
The bar a is provided with a boring tool or cutter / so arranged that its cutting end
projects from one side of the said bar. This tool or cutter is adjustable to and from
the work by means of an adjusting screw fl, and is secured, when adjusted to any
desired position, by the set-screw for by other suitable means.
The ends of the said bar a are to be firmly secured in travelling saddles, or other
provision must be made for moving the cutting tool longitudinally through the tube A
to be bored..
The said tube A is supported in bearings g and is secured by means of set-screws or
otherwise in a sleeve or boss formed or fixed on a worm-wheel arranged to be
driven by means of suitable gearing so that the said tube may be rotated while the
cutter, is passing longitudinally through and cutting the same. The worm-wheel h
may be supported in suitable bearings on the bed of the machine or it may be
supported by the bearings through the medium of the tube A as shown.
For boring long tubes I prefer that the boring bar or cutter-bar a should be made
as large in diameter as the bore of the tube will permit, so as to give it the greatest
possible rigidity.
In the boring of long tubes as heretofore practised, great difficulty has been
experienced in consequence of the deflection or springing of the bar due to its weight
and to the pressure on the tool; but I am enabled to avoid the difficulty arising from
this cause, as, in my improved arrangement, the bar will not be subject to deflection
to such an extent as will materially alter the distance of the cutting edge of the tool
from the centre of the tube being operated upon.
The boring bar or cutter-bar shown in Figures 1 to 4 is approximately rectangular
in transverse section, but either a round bar or a bar of other suitable shape in
transverse section will serve my purpose. The tool is, in some cases, set in a cutter-
head fitted to slide along the bar and fed forward by a screw or other suitable
means.
In Figures 5 to 8, I have shown part of a boring machine provided with a round
boring bar or cutter-bar a having a cutter-head fitted to slide in a longitudinal
groove or channel a! in the said bar. For moving the tool longitudinally along the
bar a I employ a screw & extending from end to end of the said bar and engaging with
corresponding screw-threads in the cutter-head j. This screw is fitted to rotate in
suitable bearings attached to the bar a, but is held against end wise movement in the
said bearings. A worm-wheel 7 is connected with the said screw by a friction clutch m
and is geared with a worm n, whereby rotary motion may be imparted to the said
screw from any suitable driving mechanism. The ends of the screw kare made square
or are otherwise adapted to receive a crank-handle whereby the said screw may be
turned by hand when the clutch is disconnected.
b
.In the apparatus shown in Figures 5 to 8, the bearings 6 are arranged to swivel
upon the blocks c, being secured thereto by bolts c³ passed through curved or segmental
slots in the base of the bearing b. Moreover the block c is arranged upon the slide
or carriage e in such a manner that it may be moved thercon transversely to the bed
of the machine by means of an adjusting screw d and may be secured in any required
position upon the said slide or carriage. A graduated scale is marked upon the
block and an index or pointer is fixed upon the bearing 6 to indicate the angular
adjustment of the bar a.
C
I
To more effectually obviate the defects arising from deflection of the boring bar, 1
sometimes adopt an improved method of counteracting or correcting such deflection,

page_text: that is to say, I place the said bar on the bed of a planing machine or other plane
surface so that it rests upon supports or bearings the distance between which is about
equal to that between the bearings of the bar when in its place in the boring-machine.
Then while the bar is in a state of deflection due to its weight, I cut in or upon the
said bar a straight longitudinal groove or surface in or upon which the cutter-head is
to slide, and which is parallel with the said bed or plane surface. Therefore, when the
said bar is in use in the boring machine, the cutting tool will move in a straight path,
instead of following the deflection of the bar.
In Figures 9 to 12, I have illustrated a modification of my invention wherein the
cutting tool is vertical and is arranged to operate upon the top of the internal surface
of the tube or hoop to be bored.
The boring bara has two lugs a², a³ formed thereon, whereby the said bar is
supported on a swivelling block to which it is secured by screw-bolis. The block r
is provided with trunnions whereby it is supported in bearings in a saddles.
This saddle is provided with a screw-threaded extension s fitting into a nut t. The
said nut is fitted to rotate in the slide or carriage e and is provided with a worm-wheel (1
with which is geared a worm u for imparting rotary motion to the said nut and thus
raising or lowering the saddles and the end of the bar a supported therein. The
other end of the said boring bar is either pivoted in any convenient manner to a
suitable rest or support at a fixed height above the bed of the machine, or it is
supported in a vertically adjustable saddle similar to that above described. In the
latter case, the said boring bar can be turned upon or about a pivot at either end for
taper work, or can be raised equally at both ends to adjust it to the work in the case
of parallel boring. The bolts are passed through elongated holes or slots af in the
lugs a², a³, so that, when the said bolts are slackened, the bar a can slide within the
swivelling block at one end, sufficiently to adjust itself therein when turned upon or
about the pivot at the other end.
It is obvious that other means may, if desired, be provided for adjusting the boring
bar in a vertical plane either to vary the angle of the said bar according to the
required taper of the bore of the tube or hoop, or to move the cutting tool towards or
away from the work.
By arranging the bar as above described so that the tool is vertical and the said bar
is adjustable in a vertical plane, 1 provide for very conveniently and expeditiously
altering the position of the said bar to suit any required taper of the tube to be bored.
This arrangement, moreover, affords great facility for making the bar true by the
method above described.
To provide for very accurately effecting the angular adjustment of the boring bar, I
use an indicator comprising a graduated disc or dial fixed on the shaft of the
worm u, and an index or pointer we firmly attached to the slide or carriage e.
The boring bar may, in any of the modifications above described, be arranged in
combination with suitable mechanism for moving it and the cutter longitudinally
through the tube or hoop to be bored while the latter is being rotated. As this
arrangement, however, necessitates the use of a very long bar, I prefer to secure the
tool in a cutter-head and to provide suitable means for feeding the said head along the
bar during the rotation of the tube or hoop.
For forming curves, bevels, shoulders or other variations or irregularities of diameter
in the bore, I provide one or both ends of the bar or the machine with a pattern or
device which causes the boring tool to follow a path corresponding with the variations
or irregularities to be formed in the bore.
Having now particularly described and ascertained the nature of the said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
First. In a boring-machine, a cutter-bar which is supported in bearings whereby it is
angularly adjustable relatively to the axis of the work for the purpose above specified.
Second. A tube-boring machine wherein apparatus for rotating the tube is arranged
in combination with a non-rotative cutter-bar which slides or moves longitudinally,

page_text: or carries a cutting tool that slides longitudinally, and which bar is capable of lateral
and angular adjustment for the purposes above specified.
Third. The bearing or support constructed with a swivelling block and slide
substantially as described with reference to Figures 1 to 4, or modified as described
with reference to Figures 5 to 8 of the drawings, so that it may be adjusted as, and
for the purposes, above specified.
Fourth. A boring-bar having a guiding surface for the tool or cutter-head so formed
that the said tool while travelling along the bar will not follow the deflection thereof.
Fifth. In the construction of a boring-bar, the formation of a longitudinal groove or
surface in or upon it, while in a state of deflection, by supporting the said bar in
bearings upon the bed of a planing machine or other true surface and planing or
otherwise cutting the said bar parallel to the said bed or surface, as above set forth.
Sixth. A boring-bar which has the cutting tool arranged to travel along the upper
surface thereof and which is supported at one or both ends upon pivot-bearings for
permitting the angular adjustment of the bar, substantially as, and for the purpose,
specified.
Seventh. In a boring machine, the parts constructed and combined substantially as
described with reference to Figures 1, 2, 3, and 4 or to Figures 5, 6, 7 and 8 or to
Figures 9, 10, 11 and 12 of the drawings and operating as above set forth.
Dated this 10th J
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.