IMPROVEMENTS IN CORE. TUBES FOR BORING MACHINES
Year: 1874

page_text: LETTERS PATENT to Maurice Belsham, of Darlington, in the County
of Durham, Engineer, for the Invention of "IMPROVEMENTS IN CORE.
TUBES FOR BORING MACHINES."
Sealed the 21st August 1874, and dated the 4th April 1874.
PROVISIONAL SPECIFICATION left by the said Maurice Belsham at-
the Office of the Commissioners of Patents, with his Petition, on
the 4th April 1874:
I, MAURICE BELSHAM, of Darlington, in the County of Durham,
Engineer, do hereby declare the nature of the said Invention for "Im.."
PROVEMENTS IN CORE TUBES FOR BORING MACHINES," to be as follows:—
My Invention is particularly applicable in boring for coal and other:
soft strata, and it consists in so contructing the boring tool that a coro
of the strata can be drawn up intact. This I accomplish by the use of
an internal stationary core tube which is pivoted to the socket of the
ordinary boring tube. There is an annular space between the exterior >
of the internal tube and the inside of the boring tube for the passage of
i
'

page_text: water. The crown cutter of the boring tube is stepped to facilitate the
cutting of the core. As the boring tube revolves the weight of the bore
rods causes the cutting tool to penetrate through the strata and the core
enters the core tube; when the bore rods are raised the core is extracted
and it is prevented from falling out by four or other convenient number
of steel wedges which fit in slots at the lower end of the internal core
tube; these slots are bevelled to correspond with the steel wedges.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Maurice Belsham in the Great Scal Patent Office
on the 1st October 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MAURICE
BELSHAM, of Darlington, in the County of Durham, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of April, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-seventh
year of Her reign, did, for Herself, Her heirs and successors, give:
and grant unto me, the said Maurice Belsham, Her special licence
that I, the said Maurice Belsham, my executors, administrators, and
assigns, or such others as I, the said Maurice Belsham, my executors, a
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 for "IMPROVEMENTS IN 2
CORE TUBES FOR BORING MACHINES," upon the condition (amongst others)¨
that I, the said Maurice Belsham, my executors or administrators, by
an instrument in writing under my, or their, or one of their hands
and scals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and a
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;
.:
Potent

page_text: NOW KNOW YE, that I, the said Maurico Belsham, do hereby declaro
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement (that is to say):-
My Invention is particularly applicable in boring for coal and other
soft strata, and it consists in so constructing the boring tool that a core of
tlic strata can be drawn up intact. This I accomplish by the use of an
internal stationary core tube which is pivotted to the socket of the
ordinary boring tube. There is an annular space between the exterior
o of the internal tube and the inside of the boring tube for the passage of
water. The crown cutter of the boring tube is stepped to facilitate the
cutting of the core. As the boring tube revolves the weight of the bore
rods causes the cutting tool to penetrate through the strata and the core
enters the tube; when the bore rods are raised the core is extracted and
5 it is prevented from falling out while the bore rods are being raised by
four or other convenient number of steel wedges which fit in slots at the
lower end of the internal core tube; these slots are bevelled to corre-
spond with the steel wedges. While the boring tube is penetrating the
stratum of coal or other mineral the wedges slide up their slots, but
when the boring tool is raised the weight of the core causes the wedges
to descend, thereby binding the lower end of the core.
And in order that my Invention may be fully understood and readily
carried into operation, I will proceed to describe the accompanying
Sheet of Drawings, reference being had to the figures and letters marked,
3 thereon.
Fig. 1 is a vertical section of my improved core tube and boring.
apparatus; Fig. 2 is a section through the .dotted line A, B; Fig. 3 is.
an exterior view of the lower end of the core tube; Fig. 4 is a section
through the same; and Figs. 5 and 6 are sections through the rings for
making the wedge-shaped extractors and for filling up the spaces
between the extractors..
i
a is the lower end of the ordinary boring rod which is turned round:
by steam or other power as usual, and to which the socket of the
boring tube c is screwed; d is the internal stationary core tube to the'
upper end of which is screwed the pivotted socket e, the taper point of

page_text: .
which fits in a corresponding. recess in the socket b. In the upper part
of the pivotted socket e is an annular groove in which the pin f passing
through the socket b. fits; by this means the boring tube c and coro-
tube d are pivotted together so that the rotary motion of the boring tube
is not imparted to the core tube. To the lower end of the pivotted 5
socket e is screwed the scating plug g of the valve in the upper part
of which is a recess containing the coiled spring h, the object of which
is to keep the valve closed. At the lower end of the boring tube c is
the crown cutter which is stepped or made with two cutting faces to
facilitate the cutting of the core shewn at j, and at the lower end of tho; 1
core tube d is an inclined annular recess containing the four or other
convenient number of toothed steel extractors which are made by
turning up a steel ring and then cutting it into cight or other convenient,
number of parts, as shewn in Fig. 4, or in any other suitable manner;:
and in order to keep the said wedges at their proper distance apart I 1
prepare another ring of the section shewn in Fig. 6, and cut that up
into segments to fill the spaces between the extractors k.
.
When the boring tool is in operation there is a constant stream of
water allowed to flow down the hollow boring rod a, which water passes.
through the four or other convenient number of holes in the socket 6, 2
and thence into the annular space between the exterior of the core
tube and the inside of the boring tube c, from whence it flows
through passages between the two faces of the crown cutter i. While
the boring tube is penetrating the stratum of coal or other mineral, the
corc that is being formed rises up the core tube & and causes the 2
extractors to slide up to the top of the bevelled recess in the lower-
end of the core tube, but when the boring tool is raised the weight of
the core causes the wedges to descend sufficiently to bind the backs of
the extractors against the bevelled recess in which they fit, thereby
securing the core and lifting it up with the boring tool. The core so 8
made can be extracted from the core tube by unscrewing the socket.e.
Having thus stated the nature of my Invention, and described the
manner of performing the same, I wish it to be understood that I do not
intend to limit myself to the details given, and that I claim, the improved 3
boring tool in which the core is collected in a separate core tube pivotted:
to the boring tube, as shown and described, or any modification of boring,

page_text: machinery in which the core tube is pivotted to the boring tube and is
not turned round by it.
In witness whereof, I, the said Maurice Belsham, have hereto set
my hand and scal, this Thirtieth day of September, one thousand
eight hundred and seventy-four.
MAURICE BELSHAM. (L.S.)