Improved Machinery for Drilling the Heads of Cartridge Cases.
Year: 1891

page_text: Date of Application, 9th Apr., 1891
Complete Specification Left, 8th Jan., 1892-Accepted, 20th Feb.. 1892
PROVISIONAL SPECIFICATION.
Improved Machinery for Drilling the Heads of Cartridge Cases.
I HENRY GREENWOOD of Albion Works, Leeds in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to produce an automatic machine for boring out,
in the heads of cartridge cases, the recess for the reception of the percussion cap,
and drilling the fire hole, at one and the same operation.
To this end mount in standards upon a bed plate a mandril to which is keyed
a disc shaped feed plate fitted with a ring of dies, say ten in number.
These dies are intended to receive and hold firmly therein, under the operation
of the drilling tool, the cartridge cases to be operated upon.
The outer end of the mandril is formed with a collar which is held elastically
against the end bearing by means of a coiled spring seated in the base of the near
standard, and pressing on a rock lever, the opposite end of which bears against the
outer end of the mandril.
The cases, as they are supplied to the feed plate, are inserted in the dies by a
pusher pin fixed to a sliding headstock in which the drill spindle is mounted.
Each case is pressed lightly into its die by the advance of this pin, which then
recedes, leaving the feed plate free to make a partial rotation, and thereby bring
the case into line with the drill spindle.
This spindle carries a chuck in which is fitted a drill of two diameters, which
correspond respectively with the recess for the percussion cap and the fire-hole.
Before the next advance of the sliding headstock to bring the drill into action, a
pressing arm is caused to advance for the purpose of pressing the case home in the
die, and gauging its position with respect to the advancing drill.
It is to ensure a uniformn position of the cases with respect to the drill, that the
mandril and feeding plate are held up to their work by the yielding pressure of a
spring, as above mentioned.
Thus, the pressing arm will push the cases home into the dies, and at the same
time force back the feeding plate to the extent requisite for ensuring the drilling
of the recesses to one uniform depth.
This pressing arm is carried by a slide mounted in the sliding headstock, and an
opening is made through the arm to allow the drill to reach its work while the
pressing arm is in contact with the case.
When the drill, by its advance, has bored out the recess for the percussion cap
and pierced the fire hole, it retires, together with the pressing arm and the pusher
pin, and a further axial movement of the feed plate takes place to bring into line
a fresh cartridge case, while that just operated upon is presented to a sliding
piston, that, by its advance, ejects the case from the machine. This piston works
in guides formed for it in the mandril standards.
The automatic advancing movements of the sliding headstock, the pressing arm,
and the ejector piston, are obtained from cams on a cam shaft mounted in bearings
carried by standards bolted to the bed plate.
This cam shaft receives rotary motion through suitable gearing from the driving
shaft, which shaft also drives the drill spindle direct.
The mandril carrying the feed plate is also fitted with a ratchet wheel, through
which it receives an intermittent axial motion. Into the notches of this ratchet
wheel takes a pawl carried by an arm hung upon the mandril, and receiving a
reciprocating motion from a cam on the cam shaft.
The periphery of the feed plate is correspondingly notched to receive a locking
pawl, which is held to its work by springs, and is drawn back by a cam on the

page_text: cam shaft, to allow of the intermittent rotation of the feed plate under the action
of the ratchet wheel and pawl.
The cases to be operated upon are inserted by hand in the dies in the feeding
plate, and, as the plate moves round, they are brought successively under the action
of the pusher pin and the presser arm, to ensure their proper presentation to the
drill.
NEWTON & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Machinery for Drilling the Heads of Cartridge Cases.
1, HENRY GREENWOOD of Albion Works, Leeds in the County of York,
Engineer, 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 :—
The object of this invention is to produce an automatic machine for boring out,
in the heads of metallic cartridge cases, the recess for the reception of the
percussion cap, and drilling the fire-hole, at one and the same operation.
To this end mount in standards upon a bed plate a mandril to which is keyed
a disc-shaped feed-plate fitted with a ring of dies, say, ten in number, which serve
as chucks.
These dies are intended to receive and hold firmly therein, under the operation
of the drilling tool, the cartridge cases to be operated upon, which are severally
brought up opposite the drill, and, by means of a presser, held in the position
requisite for ensuring the boring of the head of the proper depth for the reception
of the cap.
In the accompanying drawings,
Fig. 1 is a plan view of my improved machine for simultaneously boring the cap
chamber and drilling the fire-hole in the heads of cartridge cases.
Fig. 2 is a side elevation of the same.
Fig. 3 is an elevation of the right hand end of the machine; and
Fig. 4 is a vertical cross section taken in the line 1, 2 of Fig. 1, and looking in
the direction of the arrow.
Fig. 5 shews, on an enlarged scale, and in partial section, the instrument by
which the cartridge case is adjusted in position relatively to the boring and drilling
tool; also that tool, which is shown in its extreme position at the completion of its
work. The feed plate, die, and case, are also represented in section, the better to
illustrate the action of the parts.
A A is a hollow casting forming the bed or table of the machine, supported on
end standards A¹.
AA is a pair of bracket castings which carry the driving shaft B, fitted with
a pair of fast and loose band pulleys bb, a band wheel ', which serves to drive
the drill spindle, and a band pulley 62 for transmitting motion to the cam shaft C.
This shaft C turns in bearings carried by short standards A³, bolted to the bed
plate A, and from it are derived all the movements which are imparted to the
machine.
D is the feed plate fitted with, say, ten dies or chucks d, for receiving the
cartridge cases from the hand of the attendant, and presenting the cases severally
in succession to the presser pin e, the pressing arm e, and drill spindle e², and lastly,
to a discharging pin or piston as hereinafter explained.
The feed plate D is keyed to a mandril D' mounted in short standards A' bolted
to the bed A of the machine.
Keyed also to this mandril is a ratchet wheel D, with teeth corresponding in
number to the dies carried by the feed plate.

page_text: Taking into this ratchet wheel, is a pawle d', carried by a pair of arms hung
upon the mandril. The pin which carries this pawl, couples the two arms
together, and receives also the eyes of a pair of connecting rods d, which are pivotted
at their opposite ends to a vertical arm d', fulcrummed on a lug d³ on the bed or
table.
The vertical arm & carries a bowle which enters the groove of a face cam C¹ of
the cam shaft C, and thus, as the cam shaft rotates, a reciprocating motion is
imparted to the pawle d', for the purpose of driving the ratchet wheel and the
mandril D' with its feed plate intermittently.
A coiled spring do, connected to a fixed point, and to the tail of the pawle d¹,
serves to keep that pawle in contact with the ratchet wheel.
E is a sliding headstock, mounted in V guides on the bed A. This headstock
carries the pusher pin e, the pressing arm e', and the drill spindle ², the latter of
which turns in bearings in the headstock.
The pressing arm el is mounted in guides, and is free to slide to and from the
work independently of the movements of the headstock.
The pusher pin is made fast to a lug on the headstock, and takes its movements
therefrom.
The traverse movements of the headstock are derived from a peripherically
grooved cam Con the cam shaft C, into which takes a bowle carried by a
horizontal rock lever E', fulcrummed on the bed A, and connected by a pin to the
underside of the headstock.
The advance, therefore, of the headstock will bring both the pusher pin and the
drill into contact with the work.
Before however the drill spindle is advanced, a forward motion is given to the
pressing arm e', which is so shaped (see the enlarged view Fig. 5), as, when
advanced, to press upon the head of the cartridge case, and push it tightly into the
die or chuck, holding it in such a position that when the drill spindle advances,
its boring tool shall enter the head (for shaping the cap chamber) only to a
determined depth.
In the end of the pressing arm coincident with the axis of the cartridge case
(when brought into position for drilling), is an opening for the passage of the drill
to reach the work.
The movements of this pressing arme are derived from a peripherically grooved
cam C³, into which takes a bowle carried by the arm e¹.
It should be understood that this arm comes into action immediately after the
pusher pin has thrust a cartridge case lightly into its die, and an axial movement
of the feed plate has brought that cartridge case into line with the drill spindle.
The advance, therefore, of the pressing arm, will complete the insertion of the
case in the die, or failing this (by the case meeting some obstruction), the pressing
arm will thrust it forward, together with the die and feeding plate which hold it,
into the desired position for the boring and drilling tool to act.
To permit of this, the outer end of the mandril D¹ is formed with a collar, which
is held clastically against the end bearing by means of a coiled spring d* seated on
the base of the near standard A', and pressing on a rock lever D, the opposite end
of which bears against the outer end of the mandril.
As, therefore, the pressure of the arm el is imparted to the feed plate, the
mandril will yield to that pressure, and allow the cartridge case, although not
thrust home in the die, to take its proper position with respect to the boring and
drilling tool.
By reference to Fig. 5 it will be seen that the spindle e carries a chuck, in which
is fitted a drill of two diameters corresponding respectively with the diameters
required for the cap chamber and the fire hole.
When the drill, by its advance, has bored out the recess for the percussion cap,
and pierced the fire-hole, it retires, together with the pressing arm and the pusher
pin, and a further axial movement of the feed plate takes place, to bring into line a
fresh cartridge case, while that just operated upon is presented to a discharging rod

page_text: or sliding piston, which, by its advance, ejects the case from the machine. This
rod or piston works in guides formed for it in the mandril standards, and it receives
a reciprocating motion from the peripherically grooved cam C' through a rock
lever fulcrummed on a bracket of the bed A.
To one end of this rock lever, the discharging rod is pirotted, and at its other
end it carries a bowle which enters the groove of the cam C.
The feed plate D is furnished on its periphery with notches corresponding in
number with the dies or chucks which it carries, and into these notches takes a
locking bolt d, which slides in a horizontal guide A³ formed in the standard A.
The tail end of this bolt is bent down to overlie an edge cam C³, and present a
bowle, which it carries to that cam. A coiled spring de, connected to this bolt, and
to a fixed point on the standard, gives the bolt a tendency to engage with the feed
plate D, as its notches are presented to the bolt.
By the rotation, however, of the cam shaft, the bolt d' is withdrawn just prior to
the pawle commencing to act upon its rachet wheel D³, for the purpose of shifting
round the charged feed plate.
The cam shaft C receives motion from the main driving shaft B. through a spur
wheel C, which gears into an intermediate pinion 3, made fast to the boss of a
belt pulley, mounted on a stud axle.
This pulley is driven from the belt pulley 2 on the shaft B, and thus the rapid
rotary motion of the shaft B is greatly reduced in the transmission of the motion to
the cam shaft.
This cam shaft receives rotary motion through suitable gearing from the driving
shaft, which shaft also drives the drill spindle e direct.
The cases to be operated upon are inserted by hand in the dies in the feeding
plate, and as the plate moves round by the pawle and ratchet wheel, they are
brought successively under the action of the pusher pin e and the presser arm e',
to ensure their proper presentation to the drill.
On the retirement of the drill and presser arm, the drilled case is, by the further
axial movement of the feed plate, brought opposite the discharging piston, which,
entering the open end of the case, strikes the closed end, and thrusts the case out
of its die, whence it will fall into a suitable receptacle.
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
The arrangement of drilling machinery above described, in which is combined
means for pressing the cartridge cases automatically into dies or chucks carried by
an intermittently rotating feed plate capable of yielding to lateral pressure, in
combination with a double action drill which simultaneously bores out the cap
chamber and drills the fire hole, the position of the case, when presented to the
drill, being controlled by a pressing arm, or its equivalent, as and for the purpose
above set forth.
Dated this 7th day of January 1892.
NEWTON & SON,
Agents for the Applicant.