IMPROVEMENTS IN BOILERS AND APPARATUS TO BE USED IN CONNECTION THEREWITII
Year: 1876

page_text: LETTERS PATENT to Charles Herbert Holt, of the Turnbridge Iron and Boiler
Works Company, Limited, Huddersfield, in the County of York, for the
Invention of "IMPROVEMENTS IN BOILERS AND APPARATUS TO BE USED IN
CONNECTION THEREWITII."
Sealed the 1st September 1876, and dated the 9th March 1876.
PROVISIONAL SPECIFICATION left by the said Charles Herbert Holt at the
Office of the Commissioners of Patents on the 9th March 1876.
CHARLES HERBERT HOLT, of the Turnbridge Iron and Boiler Works Company,
Limited, Huddersfield, in the County of York. "IMPROVEMENTS IN BOILERS, AND
APPARATUS TO BE USED IN CONNECTION THEREWITH."
The first part relates to horizontal boilers, and consists in a new arrangement of
the parallel tubes inserted in the flues beyond the fire-boxes of boilers. Instead of
cach alternate tube being arranged to cross each other I have two tubes arranged
parallel to each other alternately with two others similarly arranged to cross the
former, whereby I obtain double the quantity of heating surface. I also introduce
a perforated pipe along the bottom of the flue, through which I transmit a blast of
air to lift the dust into the draught, which takes it forward along the flue to the
dust chamber.
The second part relates to vertical boilers, and consists in arranging a series of
tubes horizontally in a box or chamber placed about the middle of the boiler above
the fire-box, and on each side thereof a series of vertical tubes so enclosed and
passages formed that the flame will first pass in contact with one series of vertical
tubes, thence the horizontal tubes, thence the other series of vertical tubes, and
thence through a flue out at the top of the boiler, whereby I obtain great heating
surface.
The third part relates to the safety valves used in connection with boilers, and
my improvements consist in having the float constructed of cast iron or other metal,
hollow, and filled with some suitable cement insoluble in boiling water, whereby
there is no liability to vary in weight, as is the case with brick or stone floats
ordinarily used. The lever I have suspended on a stem or rod connected to a valve
in the top of the boiler. Also I have another valve with a stem passing through a
hole in the lever, to which is suspended a weight, and on this stem is a collar above

page_text: the lever, which lever is formed to act on the said collar when the water gets too
low in the boiler, and will lift the said valve, also if the steam gets too high a
pressure in the boiler both valves are at liberty to lift.
The fourth part of my Invention relates to what are technically known as
economizers used in connection with boilers for heating the feed water, and more
especially to the means of operating the scrapers for removing the soot from the
water pipes, and my improvements consist in operating such scrapers by means of a
crank (or its equivalent stud plate) and rod, either to actuate a lever to which two
sets of scrapers are attached, or a segment toothed wheel gearing with a pinion
attached to a chain pulley carrying the two sets of scrapers, by which I obtain the
required reciprocatory motion of the scrapers from a continuous rotary motion,
and thereby dispense with a reversing motion and all gearing required for that
purpose.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Herbert Holt in the Great Seal Patent Office on the 8th
September 1876.
CILARLES HERBERT HOLT, of the Turnbridge Iron and Boiler Works Company,
Limited, Huddersfield, in the County of York. "IMPROVEMENTS IN BOILERS, AND
APPARATUS TO BE USED IN CONNECTION THEREWITH."
The first part relates to horizontal boilers, and consists in a new arrangement of
the parallel tubes inserted in the flues beyond the fire-boxes of boilers. Instead
of each alternate tube being arranged to cross cach other I have two tubes
arranged parallel to each other alternately with two others similarly arranged to
cross the former, whereby I obtain double the quantity of heating surface. I also
introduce a pipe along the bottom of the flue, through which I transmit a blast of
air to lift the dust into the draught, which takes it forward along the flue to the
dust chamber.
Figs. 1, 2, and 3 illustrate this part of my Invention, in which A are the tubes
arranged in pairs, as above described, B being the pipes placed in the bottom of the
flue, a current of air caused by a fan or other means passing along the said pipes
and through the perforations therein, lifting and agitating the accumulated dust,
which is thence carried forward up the flue by the draught.
The second part of my Invention relates to vertical boilers, and consists in
arranging a series of tubes horizontally in a box or chamber placed about the middle
of the boiler above the fire-box, and on each side thereof a series of vertical tubes
so enclosed and passages formed that the flame will first pass in contact with one
series of vertical tubes, thence with the horizontal tubes, thence with the other
series of vertical tubes, and thence through a fluc out at the top of the boiler,
whereby I obtain great heating surface.
Figs. 4, 5, and 6 illustrate a vertical boiler in sections constructed in accordance
with the above description. Care a series of tubes placed horizontally in a mid-
feather or chamber D placed in the fire-box E; F aro two sets of vertical tubes, and
the arrows show the direction of the flame and heated gases.
The third part relates to the safety valves used in connection with boilers, and
my improvements consist in having the float constructed of cast iron or other metal,
hollow, and filled with some suitable cement insoluble in boiling water, whereby
there is no liability to vary in weight, as is the case with brick or stone floats
ordinarly used. I suspend the float lever from a stem or rod connected to a valve
in the top of the boiler. I have also another valve with a stem passing through a
hole in the lever, to which is suspended a weight, and on this stem is a collar above
the lever, which lever is formed to act on the said collar when the water gets too
low in the boiler, and will lift whe said valve; also if the steam gets too high a
pressure in the boiler both valves are at liberty to lift.

page_text: Figs. 7, 8, and 9 illustrate this part of my Invention, in carrying out which I fix
a valve block G to the boiler top. This valve block is covered with a dome H, and
contains four valves of brass witli brass seatings connected and operated as follows :-―
The float J, constructed hollow, and filled with a non-absorbent cement, is suspended
on the end of a balance lever K, and on the other end of this lever is a counter-
balance weight L. This lever is hung or suspended by the rod M of the valve N,
which rod M acts as the fulcrum. The stem of the valve O passes through a hole
in the lever K, and carries the dead weight P. On the stem is a collar a, and the
lever K directly underneath is formed with a point or projection b, so as to act on
this collar when the water gets too low in the boiler, and will lift the said valve O,
and sound the steam alarm c. It will also be seen that if the steam in the boiler
gets up to a high pressure it can lift both of the valves N and O.
In combination with the above arrangement I make use of other two valves R
connected by stems & to cross bar e, at each end of which is a weight f. A lever g
is placed outside the dome, and connected by rod h to these valves, so that steam
may be let off by hand when required. Also by placing a weight in the notch of
the lever g the pressure of the boiler can be reduced as low as required, which will
be found convenient on occasions such as holidays and during the night time.
The fourth part of my Invention relates to what are technically known as
economizers used in connection with the boilers for heating the feed water, and
more especially to the means of operating the scrapers for removing the soot from
the water pipes; and my improvements, which are illustrated in Figs. 10 and 11,
consist in operating such scrapers by means of a crank or other equivalent and rod,
either to actuate a lever to which two sets of scrapers are attached, or a segment
toothed wheel gearing with a pinion attached to a chain pulley carrying the two
sets of scrapers, by which I obtain the required reciprocatory motion of the scrapers
from a continuous rotary motion, and thereby dispense with a reversing motion and
its accompanying gearing.
In the Figs. above referred to are shown a chain wheel S carrying a chain to
which the two sets of scrapers are attached. On the shaft of this chain wheel is
keyed a bevil wheel j, and in the same centre line fixed stationary to the framework
is a segment of another similar bevil wheel. Another wheel T is mounted loosely
on a stud 7, which is fixed to a boss or collar on the shaft of the chain pulley, the
other end of the stud being attached to the crank rod U, which is actuated from the
wheel V from any convenient source. As the crank rises and falls the wheel T
(which is in gear with both of the wheels j and ) is turned round by the stationary
segment K, and causes the wheel j to perform about double the portion of a revolu-
tion as that performed by the wheel T, which motion is imparted to the chain
wheel S. It will thus be seen that I obtain a reciprocatory motion of considerable
extent from a continuous rotary motion by a limited amount of mechanism, and
with little wear and tear of machinery.
In witness whereof, I, the said Charles Herbert Holt, have hereunto set my
hand and seal, this Seventh day of September, in the year of our Lord One
thousand eight hundred and seventy-six
Witness,
J. W. TASKER,
Patent Agent,
Halifax.
C. H. HOLT. (L.S.)