CERTAIN IMPROVEMENTS IN WATER TUBE BOILERS
Year: 1870

page_text: LETTERS PATENT to John Pinchbeck, of 27, Leadenhall Street, in the
City of London, County of Middlesex, for the Invention of "CERTAIN
IMPROVEMENTS IN WATER TUBE BOILERS."
PROVISIONAL SPECIFICATION left by the said John Pinchbeck at the
Office of the Commissioners of Patents, with his Petition, on the
28th July 1870.
I, JOHN PINCHBECK, of 27, Leadenhall Street, in the City of London,
County of Middlesex, do hereby declare the nature of the said Invention
for "CERTAIN IMPROVEMENTS IN WATER TUBE BOILERS," to be as follows:-
The object of this Invention is to insure a perfect means of cleaning
out the circulating tubes and preventing any deposit therein, and this I
accomplish by the establishment of a mechanical connection between a
movable plate and the opening of a blow-off cock handle, so that when
the blow-off cock is opened the moveable plate carrying the inner or
water tubes is brought down upon two angle-iron rings, thus forming a
kind of valve and shutting off (when blowing through) the steam chest

page_text: portion of the boiler from the blow-off cock except through the tubes
themselves, by which means a great rush of water & steam may be
obtained through the tubes, and deposit effectually prevented.
In order to make my meaning clear I append hereto a Drawing.
Figure 1 is a bastard longitudinal section, and Figure 2 a bastard cross
section of an ordinary vertical water tube boiler.
The angle iron rings a and b are fixed to the interior of the boiler, the
moveable plate c carries the inner or circulating tubes. When blowing
through it is held and forms a joint on the angle-iron rings. This plate
is connected by four rods e, e, e, e, to the ring f, and this is jointed by
the levers g, g, to the rocking shaft. h, one end of which passes through a
stuffing box outside the boiler; on the end is keyed a lever i whichì is
connected to the blow-off cock handle, the weight m being sufficient
to cause the blow-off cock to close unless kept open by hand. The
dotted lines shew the position of the blow-off lever, the ring, and
the plate when not blowing through. When therefore the cock handle
is brought in the position shewn in full lines the ring is depressed, and
with it the plate, which now rests upon the angle iron, therby cutting
off the communication above the plate c with the rest of the boiler.
Thus the steam & water in order to escape must of necessity take the
direction shewn by the arrows, and a perfect cleansing of each tube
obtained. Similar action of the moveable plate c may be obtained by
other means, altho' I prefer the above, but in all cases I make it
imperative that the act of opening the blow-off cock should bring down
the plate c on the angle iron rings a & b.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Pinchbeck in the Great Scal Patent Office on
the 26th January 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
PINCHBECK, of 27, Leadenhall Street, in the City of London, County of:
Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of July, in the year of
our Lord One thousand eight hundred and seventy, in the thirty-fourth
year of Her reign, did, for Herself, Her heirs and successors, give and a

page_text: grant unto me, the said John Pinchbeck, Her special licence that I, the
said John Pinchbeck, my executors, administrators, and assigns, or such
others as I, the said John Pinchbeck, 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 for "CERTAIN IMPROVEMENTS IN WATER TUBE BOILERS,"
upon the condition (amongst others) that I, the said John Pinchbeck,
my executors or administrators, by an instrument in writing under my,
or their, or one of their hands and seals, 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 John Pinchbeck, 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 :-
The object of this Invention is to insure a perfect means of cleaning
out the circulating tubes and preventing any deposit therein, and this
I accomplish by. the establishment of a mechanical connection between
a moveable plate and the opening of the blow-off cock handle, so that
when the blow-off cock is opened the moveable plate carrying the inner
or water tubes is brought down upon two angle-iron rings, thus forming
a kind of valve and shutting off (while blowing through) the steam
chest portion of the boiler from the blow-off cock except through the
tubes themselves, by which means a great rush of water and steam may
be obtained through the tubes, and deposit effectually prevented.
In order to make my meaning clear, I append hereto a Drawing.
Fig. 1 is a bastard longitudnial section, and Fig. 2 a bastard cross
section of the ordinary vertical water tube boiler.
The angle-iron rings a and b are fitted to the interior of the boiler.
The moveable plate c carries the inner or circulating tubes, and when
blowing through is held and forms a joint on the angle-iron rings. This
plate is connected by four rods e, e, e, e, to a ring f.
This ring is
jointed by the levers g, g, to the rocking, shaft h, one end of which
passes through a stuffing box outside the boiler; on the end is keyed the

page_text: lever i, which is connected to the blow-off cock handle k, the weight
on being sufficient to cause the blow-off cock to close unless held open
by hand. The dotted lines show the position of the blow-off lever, ring,
and plate when not blowing through. When therefore the cock handle
is brought in the position shewn in full lines the ring is depressed, and
with it the plate, which now rests upon the angle iron, thus cutting off
the communication above the plate c with the rest of the boiler, the
steam and water therefore must of necessity take the direction shewn by
the arrows, and a perfect cleansing of each tube is thereby obtained.
Similar action of the moveable plate c may be be obtained by other
mechanical means, altho' I prefer the above, but in all cases I make it
imperative that the act of opening the blow-off cock should bring down
the moveable plate on the angle-iron rings a, a.
In witness whereof, I, the said John Pinchbeck, have hereunto
set my hand and seal, this Twenty-sixth day of January, in the
year of our Lord One thousand eight hundred and seventy-one.