IMPROVEMENTS IN MACHINES FOR DRILLING OR BORING ROCKS AND OTHER HARD SUBSTANCES
Year: 1877

page_text: LETTERS PATENT to Thomas Brown Jordan, of the Firm of Thomas B. Jordan
and Son, Engineers and Contractors, Queen Victoria Street, in the City of
London, for the Invention of "IMPROVEMENTS IN MACHINES FOR DRILLING
OR BORING ROCKS AND OTHER HARD SUBSTANCES."
Sealed the 12th March 1878, and dated the 18th September 1877.
PROVISIONAL SPECIFICATION left by the said Thomas Brown Jordan
at the Office of the Commissioners of Patents on the 18th September 1877.
THOMAS BROWN JORDAN, of the Firm of Thomas B. Jordan and Son, Engineers
and Contractors, Queen Victoria Street, in the City of London. "IMPROVEMENTS IN
MACHINES FOR DRILLING OR BORING ROCKS AND OTHER HARD SUBSTANCES."
This Invention relates to improvements applicable to the machine described in
the Specification of my former Letters Patent, dated February 2, A.D. 1877, No. 440,
which machine is termed the pneumatic rock drill.
The present improvements have reference to the mode of feeding forward the
drill or tool in the said machine, and are designed to render the same more conve-
nient for working in a horizontal position.
The said improvements are carried into practise by cutting a screw on the upper
part of the drill bar, and fitting on the latter a long nut which is free to turn in the
lifting block. The upper part of this nut slides longitudinally through a mitre or
bevel wheel to an extent equal to the length of the drill's stroke; but the said nut
is connected with the wheel by a groove and key or feather, so that the nut cannot
turn without turning the wheel also; that is to say, the said long nut is capable of
longitudinal motion independently of the wheel, but is not capable of rotation or
axial movement independently of the said wheel.
This mitre wheel is geared with another mitre wheel on a short shaft or journal,
which is provided with a hand wheel, arranged in combination with a friction strap
or other suitable device, whereby the said wheel may be held.

page_text: When the machine is at work the lifting block and tool bar are turned by the
cam, as described in the said former Specification. If the nut wheel is held or
clamped by the said device this action turns the screwed tool bar out of the nut
and feeds forward the drill tool; but if the said nut is free from the said clamp
or holding device it turns with the bar, and therefore no feed movement takes
place. It will therefore be seen that the rate of feed or advance of the tool depends
on the tightening of the said holding device or clamp, and this can be regulated or
adjusted to suit the quality or character of the rock or other substances being drilled
or perforated.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Brown Jordan in the Great Seal Patent Office on the
16th March 1878.
THOMAS BROWN JORDAN, of the Firm of Thomas B. Jordan and Son, Engineers
and Contractors, Queen Victoria Street, in the City of London. "IMPROVEMENTS IN
MACHINES FOR DRILLING OR BORING ROCKS AND OTHER HARD SUBSTANCES.'
"
This Invention relates to improvements applicable to the machine described in
the Specification of my former Letters Patent, dated February 2, A.D. 1877, No. 440,
which machine is termed the pneumatic rock drill.
The present improvements have reference to the mode of feeding forward the
drill or tool in the said machine, and are designed to render the same more conve-
nient in working, especially in a horizontal position.
The said Invention is illustrated in the accompanying Drawing, in which
Figure 1 is a longitudinal section, and Figure 2 is a section illustrating a modifi-
cation of a portion of the same.
The said machine has a cylinder supported in a suitable frame, and wherein a
piston which operates the drill or tool is driven forward by the force of air com-
pressed above or behind the said piston. The raising of the said piston and parts
connected therewith is effected by a revolving cam or cains driven by hand or
otherwise.
a is the cylinder; b, the piston; 61, is a tubular piston rod; c, c, are cams; dis
the cam shaft; c, the drill bar; f is a lifting block, which is screwed on the top of
the tubular piston rod, and is so constructed as to hold the drill bar in connection
"with it by the means herein-after described.
The said improvements are carried into practice by cutting a screw on the upper
part of the drill bar e, and fitting on the latter a long nut g, which is free to turn
in the lifting block f, but is kept in place endwise therein by the collars gl or by
other suitable means. The said block is preferably constructed in two halves or
parts f, f, secured together upon the nut by the external screwed sleeve f³. The
upper part of this nut g is capable of sliding longitudinally through a mitre or bevel
wheel for a distance equal to the length of the drill's stroke, but the said nut g
is conntcted with the wheel h by a longitudinal groove formed in one part, and a
key or feather on the other part, so that the nut g cannot turn without turning the
wheel with it; that is to say, the said long nut g is capable of longitudinal motion
independently of the wheel h, but is not capable of rotation or axial movement

page_text: independently of the said wheel. The connection between the tubular piston rod
and the drill bar in such a manner as to permit the drill bar to slide through
the piston rod, while ensuring their turning together, may be effected by means of
a longitudinal groove in the drill bar, and a key or feather projecting from the
piston rod into the said groove.
In Figure 2 I have shown a drill bar e, which is hexagonal in transverse section,
and whose connection with the tubular rod b' in such a manner as to permit it to
slide through the said rod, while ensuring its turning therewith, is effected by
forming the piston rod hexagonal in the part 6* that fits the said bar; or I form
this hexagonal part separately and screw it upon the end of the piston rod.
The mitre wheel is geared with another mitre wheel h' on a short shaft or
journal i, which is fitted to turn in a suitable bearing 2, and is provided with a
hand wheel j, arranged in combination with a friction device, whereby the said
wheel may be held or released, as desired. This device consists of a nut or nuts k,
fitted on a screw thread on the end of the shaft i, and which may be screwed
tightly against the face of the wheel j, thereby causing sufficient friction to stop or
retard the movement of the wheels and shaft j, h', and i. But instead of this nut k,
I may use a friction strap or other suitable contrivance.
When the machine is working, the lifting block f and tool bar e are turned by
the action of the cams c on the surface of the said block. If the wheels h, h', are
held or clamped by the said device k, thereby restraining the nut g, the action of
the cams on the said block through the medium of the piston rod will turn the
screwed tool bar e, so that it works through the nut and feeds forward the drill or
tool; but if the said wheels and nut are not lield or restrained by the said clamp or
holding device k, there will be nothing to prevent the turning of the nut g with the
bar e, and therefore the feed movement will be more or less diminished, or will
entirely cease. It will therefore be seen that the rate of feed or advance of the tool
may be readily controlled by the said holding device or clamp, and can be regulated
or adjusted to suit the quality or character of the rock or other substance being
drilled or perforated. By means of the hand wheel j, the feed may also be effected
by hand and the drill bar may be drawn back when desired.
Having thus fully described my said Invention, and the manner of performing
the same, I wish it understood that I claim in and forming part of a machine for
drilling rocks and other hard substances, the mechanism comprising the long nut
secured in the lifting block, and fitted to a screw thread on the drill bar, and
arranged to slide through and turn with a wheel which is geared in connection with
a stopping or retarding device, all of which parts are so constructed and arranged
that the rotation of the drill will be produced by the action of the cam or cams
on the said lifting block, and the feed may be regulated in the manner above
specified.
In witness whereof, I, the said Thomas Brown Jordan, have hereunto set my
hand and seal, this Fourteenth day of March, in the year of our Lord One
thaand night hund and n
THOMAS BROWN JORDAN. (LS.)