Year: 1888

page_text: Date of Application, 22nd Sept., 1888
Complete Specification Left, 12th Nov., 1888
Complete Specification Accepted, 5th Feb., 1889
I, THOMAS TOWNSEND, of Philadelphia, Pennsylvania, United States of America,
Machinist, do hereby declare the nature of my said Invention to be as follows:-
My invention consists of a drilling machine especially devised for the purpose of
forming a series of circumferential rows of openings in an annular plate or ring, my
invention comprising certain details in the construction of the machine with the view,
mainly, of insuring accuracy and rapidity in the operation of the machine.
The fixed frame, 1, of the machine has formed on it suitable bearings for a work-
holding carriage, 2, and for opposite drill carriages, 3, the carriage, 2, having bearings
for a shaft, 4, carrying a face plate, 5, to which is secured by clamps, 6, an annular
plate or ring, 7, in which the rows of openings are to be formed, said ring projecting
between the drills of the opposite carriages, and each carriage, in the present instance,
being provided with two drill spindles, 8, the drills of each carriage being directly
opposite those of the other carriage, and being arranged, in different circumferential
planes, so that while one pair of drills forms one circumferential row of holes the
other pair will form another and independent row parallel with the first.
Each drill carriage, 3, comprises two parts, 9, and, 10, the part, 9, carrying one of
the drill spindles, and the part, 10, carrying the other spindle. The part, 9, of the
carriage is adjustable radially in respect to the shaft, 4, by means of a screw stem, 11,
and the part, 10, of the carriage is adjustable both radially and vertically on the
part, 9, the vertical adjustment being effected by means of adjusting screws, 12, and a
locking nut, 13, and the radial adjustment being effected by a screw, 11, which is
confined longitudinally to, but is free to move vertically in a bracket, 14, on the
part, 9, of the carriage, a slot, 15, being formed in said bracket to permit this vertical
movement.
Each drill spindle has a pulley, 16, so that it can be driven by a belt from any
suitable countershaft, and the rear end of each spindle is grooved for adaptation to a
forked lug, 76, projecting from a slide, 17, guided in a suitable bracket, 18, on the
drill carriage, said slide being also provided with another lug, 19, which has a set
D

page_text: screw, 20, bearing on the end of the drill spindle, whereby the lug, 76, is relieved
from the backward thrust of the drill.
Each slide, 17, has an adjustable bearing screw, 21, which is acted upon by a series
of cams, 22, on a disk, 23, carried by a shaft, 24, adapted to bearings, 25, on the fixed
frame of the machine and driven in any suitable manner, preferably by means of a
worm wheel, 26, on the outer end of the shaft, the slides, 17, being projected by
means of springs, 27, so as to cause their screws, 21, to bear on the cams, 22.
Each cam disk, 23, has two sets of cams, 22, arranged in different circumferential
planes so as to act upon the slides, 17, of the drill spindles, 8, of one of the drill
carriages, the inner set of cams being located so far in advance of the other set that
both drill spindles will be projected simultaneously by the action of said cams.
The throw of each drill spindle is sufficient to carry its drill a little more than half
way through the annular plate or ring, 7, hence, in order to prevent the drills from
meeting in the centre of the ring, one drill is operated slightly in advance of the other,
so that it is fully projected and partially retracted before the opposite drill reaches
the limit of its inward movement.
In order to provide for the intermittent circumferential adjustment of the ring in
the intervals between the actions of the drills, the shaft, 4, has a worm wheel, 28,
which engages with a worm, 29, on a shaft, 30, the outer end of which is geared by
means of spur wheels, 31, and, 32, to a shaft, 33, carrying a ratchet wheel, 34, with
which engages a pawl, 35, hung to an arm, 36, connected by a rod, 37, to an arm, 38,
on a rock shaft, 39, free to turn on a spindle, 40, carried by an arm, 41, of the
frame, said rock shaft also having an arm, 42, which is acted upon by lugs, 43, on the
periphery of one of the cam disks, 23, whereby, on each rotation of the latter, there
will be a number of vibrations of the pawl-carrying arm, 36, and a consequent
succession of movements of the ratchet wheel, 33, to the extent of one or more teeth,
back movement of the wheel being prevented by a retaining pawl, 44.
To prevent excessive movement of the arm, 36, in either direction, a segmental
bar, 45, on the frame, carries opposite adjustable pins, 46, which serve as stops for
said arm.
The carriage, 2, is adjustable longitudinally on the frame of the machine, being
adapted to guides, 50, thereon, and having a nut for the reception of a screw
shaft, 51, transverse adjustment of the carriage being also effected by means of a
screw, 52.
The carriage is made in two parts, the upper one of which is pivoted to the lower
one and said upper part of the carriage, which has bearings for the shaft, 4, can be
adjusted to different angles by means of set screws, 54, being secured in position after
adjustment by set screws, 55, which are adapted to segmental slots, 56, in the upper
part of the carriage.
It will thus be seen that accurate adjustment of both the annular plate or ring
and the drills in respect to each other is provided for, and the openings formed in
said annular plate or ring may be either straight or inclined.
In some cases it may be desired to form wedge-shaped openings in the annular
plate or ring, in which event, after the openings have been formed therein by the
drills, a slotting tool may take the place of one of the drills and the others may be
thrown out of action, the plate or ring being adjusted to such angle as may be required
to form an opening of the required bevel therein.
In this case the spring, 27, may not be strong enough to retract the drill slide,
hence I provide the machine with a bell-crank lever, 60, acted upon by a spring, 61,
and acting upon a lug on the drill slide, 17, so as to aid the spring, 27, in effecting
the retraction of the latter, the spring, 61, being uncoupled except when the slotting
tool is being used.
The frame, 62, carrying the bearings for the outer end of the shaft, 30, which
drives the work carrying shaft, 4, is adapted to a slot in a bracket, 63, on the main
frame, and is confined between blocks, 64, the position of which is controlled by set
screws, 65, so that said frame can be adjusted longitudinally as may be required by
the varying angles imparted to the work-carrying plate or disk, 5.

page_text: It will be seen that the above described machine is entirely automatic in its action,
and that the various adjustments of the parts insure accuracy in the disposal of the
openings in the annular plate or ring, while rapid operation is insured by the use of
a series of drill spindles and by working said spindles in pairs, each drill passing but
part way through the ring, as the openings can be made much more rapidly in this
way than when a single drill passing completely through the ring from one side to
the other is employed.
In order to complete the drilling of the ring more rapidly, I may place two or
more drill carriages at any point on the circumference of the ring, but preferably at
a point directly opposite the drill carriages on the machine above described, each pair
of drill carriages being provided with drill spindles, so as to form a separate row of
openings in the ring.
Dated this 21st day of Sontamhan 1888
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.

page_text: I, THOMAS TOWNSEND, of Philadelphia, Pennsylvania, United States of America,
Machinist, do hereby declare the nature of the said Invention and in what manner
the same is to be performed, to he particularly described and ascertained in and by
The following statement :-
t
My invention consists of a drilling machine especially devised for the purpose of
forming a series of circumferential rows of openings in an annular plate or ring, my
invention comprising certain details in the construction of the machine with the view,
mainly, of insuring accuracy and rapidity in the operation of the machine.
In the accompanying drawings,
Fig. 1. is a plan view, partly in section, of a drilling machine constructed in
accordance with my invention.
Fig. 2. is a view of the same, partly in elevation and partly in section, on the
line 1-2, Fig. 1.
Fig. 3. is a perspective view of part of the machine.
Fig. 4. is a transverse section on the line 3-4, Fig. 1. and
Figs. 5, and, 6, are diagrams illustrating the operation of the machine.
The fixed frame, 1, of the machine-has formed on it suitable bearings for the work-
holding carriage, 2, and for opposite drill carriages, 3, 3, the carriage, 2, having
bearings for a shaft, 4, carrying the face plate, 5, to which is secured by clamps, 6,
the annular plate or ring, 7, in which the rows of openings are to be formed, said ring
projecting between the drills of the opposite carriages, and each carriage, in the
present instance, being provided with two drill spindles, 8, the drills of each carriage
being directly opposite those of the other carriage, and being arranged in different
circumferential planes, as shown in Fig. 2, so that while one pair of drills forms one
circumferential row of holes the other pair will form another and independent row
parallel with the first.
Each drill carriage, 3, comprises two parts, 9, and, 10, the part, 9, carrying one
of the drill spindles, and the part, 10, carrying the other spindle. The part, 9, of the
carriage is adjustable radially in respect to the shaft, 4, by means of a screw stem, 1.1,
and the part, 10, of the carriage is adjustable both radially and vertically on the
part, 9, the vertical adjustment being effected by means of adjusting screws, 12, and
a locking nut, 13, and the radial adjustment being effected by a screw, 11, which is
confined longitudinally to, but is free to move vertically in a bracket, 14, on the
part, 9, of the carriage, a slot, 15, being formed in said bracket to permit this vertical
movement.

page_text: Each drill spindle has a pulley, 16, so that it can be driven by a belt from any
suitable countershaft, and the rear end of each spindle is grooved for adaptation to a
forked lug, 76, projecting from a slide, 17, guided in a suitable bracket, 18, on the
drill carriage, said slide being also provided with another lug, 19, which has a set
screw, 20, bearing on the end of the drill spindle, whereby the lug, 76, is relieved
from the backward thrust of the drill.
Each slide, 17, has an adjustable bearing screw, 21, which is acted upon by a series of
cams, 22, on a disk, 23, carried by a shaft, 24, adapted to bearings, 25, on the fixed
frame of the machine and driven in any suitable manner, preferably by means of a
worm wheel, 26, on the outer end of the shaft, as shown in Fig. 3, the slides 17,
being projected by means of springs, 27, so as to cause their screws, 21, to bear on
the cams, 22.
Each cam disk, 23, has two sets of cams, 22, arranged in different circumferential
planes so as as to act upon the slides, 17, of the drill spindles, 8, of one of the
drill carriages, the inner set of cams being located so far in advance of the other
set that both drill spindles will be projected simultaneously by the action of said
cams.
The throw of each drill spindle is sufficient to carry its drill a little more than half
way through the annular plate or ring, 7, hence, in order to prevent the drills from
meeting in the centre of the ring, one drill is operated slightly in advance of the
other, so. that it is fully projected and partially retracted before the opposite drill
reaches the limit of its inward movement, as will be understood on reference to the
diagrams, Figs. 5 and 6.
In order to provide for the intermittent circumferential adjustment of the ring in
the intervals between the actions of the drills, the shaft, 4, has a worm wheel, 28,
which engages with a worm, 29, on a shaft, 30, the outer end of which is geared by
means of spur wheels, 31, and, 32. to a shaft, 33, carrying a ratchet wheel, 34, with
which engages a pawl, 35, hung to an arm, 36, connected by a rod, 37, to an arm, 38,
on a rock shaft, 39, free to turn on a spindle, 40, carried by an arm, 41, of the frame,
said rock shaft also having an arm, 42, which is acted upon by lugs, 43, on the
periphery of one of the cam disks, 23, whereby, on each rotation of the latter, there
will be a number of vibrations of the pawl-carrying arm, 36, and a consequent
succession of movements of the ratchet wheel, 34, to the extent of one or more teeth,
back movement of the wheel being prevented by a retaining pawl, 44, as shown
in Fig. 3.
To prevent excessive movement of the arm, 36, in either direction, a segmental
bar, 45, on the frame carries opposite adjustable pins, 46, which serve as stops for
said arm.
The carriage, 2, is adjustable longitudinally on the frame of the machine, being
adapted to guides, 50, thereon, and having a nut for the reception of a screw shaft, 51,
transverse adjustment of the carriage being also effected by means of a screw, 52.
The carriage is made in two parts, the upper one of which is pivoted to the lower one
at, 53; and said upper part of the carriage, which has bearings for the shaft, 4, can be
adjusted to different angles by means of set screws, 54, being secured in position after
adjustment by set screws, 55, which are adapted to segmental slots, 56, in the upper
part of the carriage, as shown in Fig. 1.
It will thus be seen that accurate adjustment of both the annular plate or ring and
the drills in respect to each other is provided for, and the openings formed in said
annular plate or ring may be either straight or inclined.
In some cases it may be desired to form wedge-shaped openings in the annular
plate or ring, in which event, after the openings have been formed therein by the
drills, a slotting tool may take the place of one of the drills and the others
thrown out of action, the plate or ring being adjusted to such angle as may be required
to form an opening of the required bevel therein.
may be
In this case the spring, 27, may not be strong enough to retract the drill slide,
hence I provide the machine with a bell-crank lever, 60, Fig. 3, this lever being acted
upon by a spring, 61, and acting upon a lug on the drill slide, 17, so as to aid the

page_text: spring, 27, in effecting the retraction of the latter, the spring, 61, being uncoupled
except when the slotting tool is being used.
The frame, 62, carrying the bearings for the outer end of the shaft, 30, which
drives the work carrying shaft, 4, is adapted to a slot in a bracket, 63, on the main
frame, and is confined between blocks, 64, the position of which is controlled by set
screws, 65, so that said frame can be adjusted longitudinally as may be required by
the varying angles imparted to the work-carrying plate or disk, 5.
It will be seen that the above described machine is entirely automatic in its action,
and that the various adjustments of the parts insure accuracy in the disposal of the
openings in the annular plate or ring, while rapid operation is insured by the use of a
series of drill spindles and by working said spindles in pairs, each drill passing but
part way through the ring, as the openings can be made much more rapidly in this
way than when a single drill passing completely through the ring from one side to the
other is employed.
In order to complete the drilling of the ring more rapidly, I may place two or more
drill carriages at any point on the circumference of the ring, but preferably at a point
directly opposite the drill carriages on the machine above described, each pair of drill
carriages being provided with drill spindles, so as to form a separate row of openings
in the ring.
Although I have shown on each drill carriage two spindles so located as to effect
the formation of two concentric rows of openings in the annular plate or ring, the
number of drill spindles on each carriage may be increased, if desired, so as to form
more than two rows of openings, or, on the other hand, each carriage may have but
a single drill spindle.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1. The combination of the pair of drill spindles located on opposite sides of the
work and having coinciding axes, with cams for moving said drill spindles to and
from the work, the cams of one spindle having a lead on those of the other spindle,
whereby one drill commences to act on the work slightly in advance of the other drill,
and starts on the return movement before the other drill is fully into the work,
substantially as hereinbefore described.
2. The combination of the rotating work holder, with a series of drill spindles
having their axes in different circumferential planes in respect to the axis of said work
holder, whereby two or more concentric rows of openings are simultaneously formed,
substantially as herein before described.
3. The combination of the work holder, the drill carriage, and the drill spindle
guided so as to be free to slide longitudinally thereon, the rotating cam disk, and the
slide connected to the drill spindle and having an adjustable bearing pin for the
action of the cams, substantially as hereinbefore described.
4. The combination of the drill carriage, the spindle free to slide longitudinally
thereon, and the slide having a lug engaging with a reduced portion of the spindle;
and a set screw forming an end bearing for said spindle, subtantially as hereinbefore
described.
5. The combination of the work holder, the drill carriage having two or more
sliding drill spindles in different planes thereon, and a rotating disk having two or
more sets of cams for operating said spindles, said cams being likewise located in
different planes, substantially as herein before described.
6. The combination of the work holder, with a drill carriage made in two parts, each
carrying a drill spindle; one part of the carriage and its spindle being adjustable in
respect to the other, substantially as hereinbefore described.
7. The combination of the fixed frame, and the drill carriage mounted thereon,
with a work holder and a carriage therefor having a pivoted section with bearings for
the work holder shaft, whereby the angle of the work in respect to the drills may be
changed, substantially as herein before described.

page_text: 8. The combination of the work holder and its carriage having a pivoted portion to
permit angular adjustment of said work holder, with an operating, shaft, and adjustable
bearings for the outer end of the latter, whereby it may be shifted to suit the angle of
the work holder, substantially as herein before described.
9. The combination of the drill carriage, and its drill spindle, the slide connected
thereto, the disk having cams for acting on said slide, the retracting spring for the
slide, and a supplementary lever and spring also serving to retract the slide, sub-
stantially as hereinbefore described.
1000
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicant.