IMPROVEMENTS IN MULTIPLE DRILLING BORING TURNING AND TAPPING MACHINES 19
Year: 1883

page_text: LETTERS PATENT to James Carver of the Town and County of the Town of
Nottingham for an Invention of "IMPROVEMENTS IN MULTIPLE DRILLING
BORING TURNING AND TAPPING MACHINES
19
PROVISIONAL SPECIFICATION left by the said James Carver at the Office
of the Commissioners of Patents on the 9th November 1883.
:
JAMES CARVER, of the Town and County of the Town of Nottingham,
"IMPROVEMENTS IN MULTIPLE DRILLING, BORING, Turning and TAPPING MACHINES,.
"
Each machine consists of the following parts, namely:-A bed plate supported
by end standards, and one or more intermediate standards, when the length of
the machine requires them, the whole of the standards are connected: together by
a bar bolted to them, near their upper ends, this bar carries bearings at the back
in which an axle shaft revolves which is provided at one end with a cone pulley
round which a belt is passed from any prime mover. Intermediately of the
standards, this shaft carries as many worms as there are operating spindles in the
machine, each worm gears into a toothed wheel on a clutch boss carried by a
oylinder, which revolves in a bearing or bearings on the front of the bar connecting
the standards; above the toothed wheel is a clutch boss, which slides on a key
carried by the cylinder, this boss is capable of being raised clear of or lowered into
gear with the toothed wheel clutch by means of a rocking lever actuated by an
excentric provided with a handle for the attendants use, passing through the
revolving cylinder is a central spindle which slides on a key, carried by the
cylinder, or it carries a key sliding in a groove in the cylinder, the spindle can be
raised or lowered by means of a screw at its upper end being actuated by a toothed
wheel and spur wheel, to give the requisite feed in the usual way. Each central
spindle is bored out at its lower end to receive either a drill, a boring bar carrying
a cutter or other instrument, a mandril or a screw tap. The bed plate of the
machine has slots or other shaped holes to receive bolts to receive the article to be
operated upon,
By means of a machine constructed as above described, each separate central
spindle can be put to work to the number of thirty or more, at one and the same
time, to either drill or bore out a hole, say of six inches in diameter, or turn up a
cylinder or other article, or tap holes, with not more than one quarter horse power,
being required to drive the whole number at once, with a belt not exceeding one
and a half inches in width.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Carver in the Patent Office on the 2nd May 1884.
JAMES CARVER, of the Town and County of the Town of Nottingham
"IMPROVEMENTS IN MULTIPLE DRILLING, BORING, TURNING AND TAPPING MACHINES
Each machine consists of the following parts, namely:-A bed plate supported
by end standards, and one or more intermediate standards, when the length of the
machine requires them, the whole of the standards are connected together by a bar
bolted to them near their upper ends, this bar carries bearings at the back, in
which an axle shaft revolves which is provided at one end with a cone pulley,
round which a belt is passed from any prime mover. Intermediately of the
standards this shaft carries as many worms as there are operating spindles in the
machine, each worm gears into a toothed wheel on a clutch boss carried by a
cylinder which revolves in a bearing or bearings on the front of the bar connecting
the standards, above the toothed wheel is a clutch boss, which slides on a key
carried by the cylinder, this boss is capable of being raised clear of, or lowered into
gear with, the toothed wheel clutch by means of a rocking lever, actuated by an
eccentric provided with a handle for the attendants use, passing through the
revolving cylinder is a central spindle which slides on a key carried by the cylinder,
or it carries a key sliding in a groove in the cylinder, the spindle can be raised or
lowered by means of a screw at its upper end being actualed by a toothed wheel
and spur wheel to give the feed required in the usual way. Each central spindle
is bored out at its lower end to receive either a drill, a boring bar carrying a cutter
or other instrument, a mandril or a screw tap. The bed plate of the machine has
slots or other shaped holes to receive bolts to secure the article to be operated upon.
By means of a machine constructed as above described each separate spindle can
be put to work, to the number of thirty or more, at one and the same time, to
either drill or bore out a hole say of six inches in diameter, or turn up a cylinder
or other article, or tap holes, with not more than one quarter horse power being
required to drive the whole number at once, with a belt not exceeding one and a
half inches in width.
Figuro 1 is a front view of one of my improved multiple drilling machines
carrying six spindles
Figure 2 is a front view showing the upper bearing of one spindle in section, and
the intermediate and lower bearings with the caps removed, and a front view of
two driving worms hereafter referred to
Figure 3 is a view of the left end of the machine showing the toothed and
frictional gearing to produce a downward feed of the spindles.
Figure 4 is a back view of half of the tie bar which forms the bearings for the
spindles.
Figure 5 is a plan of one half of the bed of the machine.
The corresponding parts in each Figure are indicated by the same letters where
necessary.
Each machine consists of the following parts, a bed plate A supported by end
standards B, connected at their upper ends by a tie bar C bolted to them, besides

page_text: the end standards, one or more intermediate standards and extra bed plates are
bolted together when the length of the machine requires them. The tie bar and
standards form bearings at the back in which an axle shaft D revolves, which is
provided at the right end with a cone pulley and fly wheel, the pulley carries &
belt from any prime mover. Intermediately of the standards the shaft D carries as
many worms D' as there are operating spindles E in the machine each worm gears
into a toothed wheel on a clutch boss E carried by a cylinder F which revolves in
upper and lower bearings C¹, half of which are formed by and on the tie bar C, the
other half of the bearings being formed by caps C, above the toothed wheel is a
clutch boss which slides on a key carried by the cylinder, this boss is grooved
round its upper end, in this groove, the studs carried by the forked end of a rocking
lever takes, the opposite end of the lever, is slotted to receive an eccentric
provided with a handle G¹, the lever G rocks on an axle secured in the front of the
tie bar, by such means the attendant is enabled to move the upper clutch boss
either into or out of gear with the lower one, passing through the revolving
cylinder is a grooved central spindle E which slides on a key carried by the
cylinder, the spindle can be raised or lowered by means of a screw E at its upper
end being actuated by a toothed wheel H which is screw threaded interiorly the
teeth of this wheel gears into the teeth of a spur wheel H¹ below which is a
forked arm I which entering the groove of the boss of the wheel H keeps it from
rising, the wheel H' is secured on the upper end of a vertical shaft, revolving in
bearings on the tie bar the lower end of the shaft carries a toothed wheel H' which
is caused to revolve by a worm J carried by a shaft K, below the toothed wheel H
is a hand wheel H³ for the use of the attendant to adjust the height of the
spindle H, and below the hand wheel is a screw threadel nut and lever H on the
lower portion of the vertical shaft which is screw threaded to receive it, when
the nut is loosed the wheel H2 can be turned round by its worm without revolving
the vertical shaft, but upon being tightened up it is clamped against the collar
above it, which being secured to the shaft causes it to revolve. The spindle E at
its upper end which projects above the screw has a collar E³ (shown in section at
Figure 2) secured on it, this collar is enclosed in a cap E' hell on the top of the
screw by two set screws, the cap is also provided with a vertical set screw and
lock nut, by which any vertical play of the spindle, may be prevented.
The revolution of the worm shaft K is effected by the following means, the left
end of the axle shaft D projects beyond the standard and carries a friction disc 1
which lies between two other discs 2, which revolve on an axle carried by the front
end of a lever I, the back end of which rocks upon an axle bolted to the back of
the standard shewu at Figure 3, below this axle the lever has an arched slot and
terminates in a handle for the use of the attendant, through the slot a screw is
passed, which takes into a bearing on the back of the stand ird, by which the two
discs can be adjusted where required at the back of the two discs is a wedge shaped
disc 3 capable of being adjusted more or less between the discs 2 by lowering or
raising the bracket carrying it on a bearing at the back, the disc 3 ensures the
inner surfaces near the circumference pressing upon the two sides of a disc 4 which
carries a toothed spur wheel 5 at its back, which gears into the teeth of a wheel 6
which is secured on the projecting left end of the worm shaft K, by which means
the vertical traverse of the spindle E is effected.
•
By means of a machine constructed as above described each separate central
spindle can be put to work to the number of thirty or more at one and the same
time, to either drill or bore out a hole say of six inches in diameter, or turn up a
cylinder, or other article or tap holes, with not more than one quarter horse power
being required to drive the whole number at once, with a belt not exceeding one
and a half inches in width.
Having thus described the nature of my said Invention and the manner of
5 performing the same, I declare that I claim for a multiple, drilling, boring, turning

page_text: and tapping machine substantially as hereinbefore described and illustrated in the
drawings annexed.
In witness whereof I, the said James Carver have hereunto set my hand and
seal, this twenty ninth day of April in the year of our Lord one thousand eight
hundred and eighty four.