TAIN IMPROVEMENTS IN MACHINES FOR DRILLING STONE
Year: 1854

page_text: LETTERS PATENT to Auguste Edouard Loradoux Bellford, of 16, Castle
Street, Holborn (City), London, Patent Agent, for the Invention of "CER-
D" A communication
Sealed the 9th March 1855, and dated the 20th September 1854.
PROVISIONAL SPECIFICATION left by the said Auguste Edouard Lora-
doux Bellford at the Office of the Commissioners of Patents, with his
Petition, on the 20th September 1854.
I, AUGUSTE EDOUARD LORADOUX BELLFORD, of 16, Castle Street, Holborn
(City), London, do hereby declare the nature of the said Invention for "CER-
TAIN IMPROVEMENTS IN MACHINES FOR DRILLING STONE" to be as follows; and
consists of catching hold of the drill bar or drill to attach it to the machinery,
by which it is lifted or drawn back, & of setting it free therefrom to enable it
to strike the blow, either by the force of its own gravity, or by springs suitably
connected with the drill or drill bar, whereby provision is made for allowing
the drill to work into the stone or to feed itself. Each drill bar is furnished
with a catch block, capable of moving freely on the drill bars, & slotted to
receive a dog. A connecting chain passes over a pulley, & connects with
one of four cranks on the driving shaft, & in conjunction with a trigger assists
in operating the dog by suitable mechanical arrangements. A modification of
this Invention applies to a horizontal machine, similar in action and construction
excepting in form, & in the addition of springs for giving the blow & drawing
back the catch block, & in the method of connecting the springs with the drill

page_text: or drill bar. Machines may be arranged to work at any angle, & the
framing may also be made adjustable in a fixed stand to work in different
positions.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Auguste Edouard Loradoux Bellford in the Great Seal Patent
Office on the 19th March 1855.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, AUGUSTE
EDOUARD LORADOUX BELLFORD, of 16, Castle Street, Holborn (City), London,
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent,-bearing date the Twentieth day of September, in the year of our Lord
One thousand eight hundred and fifty-four, in the eighteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Auguste Edouard Loradoux Bellford, Her special licence that I, the
said Auguste Edouard Loradoux Bellford, my executors, administrators, and
assigns, or such others as I, the said Auguste Edouard Loradoux Bellford,
my executors, administrators, and assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention of "CERTAIN IMPROVEMENTS IN MACHINES
FOR DRILLING STONE," a communication, upon the condition (amongst others)
that I, the said Auguste Edouard Loradoux Bellford, by an instrument in
writing under my hand and seal, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Auguste Edouard Loradoux Bellford,
do hereby declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:―
This Invention consists in certain new and improved means of catching hold
of the drill bar or drill to attach it to the machinery, by which it is lifted or drawn
back, and of setting it free therefrom to enable it to strike the blow, either by
the force of its own gravity, or by the force of springs, or their equivalents,

page_text: properly applied for the purpose. It further consists in certain new and im-
proved means of connecting the said springs, or their equivalents, with the drill
or drill bar, whereby proper provision is made for allowing the drill to work
into the stone, or, as it is termed, to feed itself.
The accompanying Drawing illustrates my Invention, both in its application
to inachines, in which the drills are arranged to act vertically, or in such other
position as to employ the weight of the drill or the bar which holds it in giving
force to the blow; and to machines in which the drills are arranged horizontally,
or in such position as to require the aid of springs or analogous appliances to
give the required movement and force.
Fig. 1 is a front view of an upright drilling machine containing my im-
provements, and Fig. 2 is a vertical section of the same.
Fig. 3 is a top view of the catch block, by which the drill is attached to the
machinery for raising it, and Fig. 4 is a vertical section of the same.
Fig. 5 is a longitudinal section of a horizontal drilling machine containing
my improvements, and Fig. 6 is a plan of the same.
In Figs. 1 and 2, A is a framing, of proper strength and proportions to
receive four cylindrical drill bars B, B, B, B, which are arranged side by side,
working in suitable guides. Each drill bar is furnished with a catch block C,
of cast or wrought iron, which is capable of sliding freely or turning on the
drill bars. This catch block is slotted on one side to receive a dog D, which is
pivoted to it by a pin a, and connected at its tail e with a chain E, which
passes over a pulley F at the top of the machine, and connects with one I, of
four cranks I, I, I, I, on the driving shaft G. This chain, by passing round
a proper guide in the catch block, is made to act in such a way, that when the
dog is not under other control, the weight of the catch block draws the dog
towards and makes it bite the drill bar, whose own weight further tightens
the bite to enable the bar to be raised by the revolution of the crank. Above
the slot, in which the dog works, is placed a trigger H, which works on a
pin 6, between two lugs C, C, in the catch block. One part of this trigger
serves as a guide to the chain E, and another part has an eccentric face d,
which works inside the tail e of the dog, and in contact with the said tail,
which is slightly bent at the end, to enter a notch f, above the eccentric.
When the catch block is being drawn upwards, the tail of the dog is in con-
tact with the face d, below the more eccentric part, and is made to hold the
trigger stationary; but just before the upward motion of the catch block
terminates, the trigger comes in contact, as shown in Fig. 2, with the upper
part of the framing A, or with some fixture attached thereto, and a very
slightly continued upward motion serves to move the more eccentric part of

page_text: its face d into contact with the tail of the dog, and throw it back far enough
to set free the drill bar, which then falls. The catch block ascends far enough,
after the setting free of the drill, to bring the tail of the dog into the notch f
as shown in Fig. 4. During nearly the whole time of the descent of the
catch bar, which is lowered by the ascent of the crank, to which the chain is
connected, the trigger remains by reason of its weight in the position shown
in Fig. 4, and holds the dog free of the drill bar; but just before the descent
terminates, the trigger comes in contact with a fixed stop h on the lower part
of the framing, and the remainder of the downward motion is sufficient to
release the tail of the dog from the notch, and throw up the trigger far enough
to bring the lower or least eccentric part of its face d opposite the tail of the
dog, and thus leave the dog entirely under control of the chain E, when the
catch block ascends. In Fig. 2 one of the triggers is shown as just having
reached its stop h, and being about to liberate its dog. The whole of the
working parts of the machine are actuated by tho revolution of the crank
shaft G, and consequent raising and lowering of the catch blocks by means of
the chains connected with their dogs. The turning of cach drill bar is effected
by means of a stud i, attached to its catch block, and working in an oblique
guide j, secured permanently to the framing. The drills being set entirely free,
every time they strike are self-feeding.
The horizontal machine represented in Figs. 5 and 6 only differs from that
just described in the form of its framing, and in the additions of springs for
giving the blow and drawing back the catch block, and of certain devices for
connecting the springs with the drill or drill bar. This machine is represented
with only one drill, but, like the upright machine, it may contain any number.
The drill bar B' works between grooved friction rollers k, k, on the framing A',
and is provided with a catch block C', with trigger II', and dog D', connected
by a chain E' with a crank 1' on a shaft G¹, and so far is substantially like
the other machine. K, K, are the springs which drive the drill bar to give the
blow. These work on guide rods p, p, and are connected at one end with the
front end of the framing A', and at the other with a plate s, which fits loosely
on a collar L, which fits loosely to the drill bar. The loose collar L is con-
nected by a short chain m, with a dog D, in a catch block C, which is like
the catch blocks C and C', previously described, except that there is no trigger,
and the position of the dog on the drill bar is reversed, and a pulley is pro-
vided in the block as a guide for the chain. N is a spring which connects the
catch block C with the framing, and is intended to produce the same effect as
the gravity of the catch block in the upright machine. When the crank is
drawing the catch block C' back in the direction of the
arrow o, on Fig. 5,

page_text: the dog D' catches the drill bar and draws it back, and as the bar moves back
it draws the dog D tight upon it, and draws back the catch block C², and
with it the collar L,.and pulls out the springs K. K, which increase the tightness
of the hold of the dog. As soon as the trigger strikes the fixed piece p¹ on
the framing, it releases the drill bar from the dog D', and allows it to be driven
towards the stone by the springs. The momentum which the drill bar acquires
shortly after it is set free of the catch block C', and the action of the springs
has commenced, will soon cause it to free itself of the catch block C³, so that
though the movement of the said catch block terminates at a certain point,
the drill is allowed to keep on advancing as it cuts into the stone. The turning
of the drill bar is effected in the same way as in the previously described
machine, by a stud on the catch block C' working in an oblique guide attached
to the framing.
Machines constructed according to this Invention may be arranged to
operate at any angle, and the force given to the drill bar may be produced by
its own gravity, or by springs, as the position may require. The framing
might also be inade adjustable in a fixed stand to work in different positions.
I claim, 1st, the means employed for catching hold of and raising the drill,
or drawing it back from the stone, and releasing it to strike the blow, consist-
ing of the catch block C or C', dog D or D', trigger H or H', and chain E, the
said catch block fitting loosely to the drill or its bar, the chain being driven
by cranks or other suitable means, and the trigger being operated upon by
coming in contact with proper fixtures on the framing of the machine, and all
being combined, as herein set forth.
2d, the means of connecting the drill or drill bar with the springs or other
devices employed to drive the drill into the stone, consisting of the catch
block C, dog D2, chain m, and a loose collar, all applied substantially as
herein set forth.
In witness whereof, I, the said Auguste Edouard Loradoux Bellford,
have hereunto set my hand and seal, this 19th day of March, in
the year of our Lord 1855.
A. E. LORADOUX BELLFORD.
L.8.