Im- SHARAKE TX BIN CONSTRUCTION OF INJECTORS FOR FEEDING STEAM BOLLERS. PROVEMENTS IN THE CONSTRUCTION OF INJECTORS FOR FEEDING STEAM BOILERS.
Year: 1873

page_text: LETTERS PATENT to John Davis, of 176, Great Dover Street, in the
Borough of Southwark, Civil Engineer, for the Invention of "Im-
SHARAKE
TX BIN CONSTRUCTION OF INJECTORS FOR FEEDING STEAM BOLLERS.
PROVEMENTS IN THE CONSTRUCTION OF INJECTORS FOR FEEDING STEAM BOILERS.
.
PROVISIONAL SPECIFICATION left by the said John Davis at the
Office of the Commissioners of Patents, with his Petition, on the
22nd May 1873.
I, JOHN DAVIS, of 176, Great Dover Street, in the Borough of South-
wark, Civil Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF INJECTORS FOR FEEDING STEAM
BOILERS," to be as follows:-
-
This Invention has for its object to secure perfect continuity and
regularity in the working of the apparatus for supplying water to steam
boilers, commonly known by the name of "Giffard's injector," by
counteracting and entirely suppressing the drawbacks affecting this
apparatus in its present construction, that is to say, the necessity of first
detaching or breaking and then restoring certain joints in order to remedy

page_text: the injury or damage accruing from time to time to the apparatus in
consequence of corrosion or of the obstruction or choking up of the
steam passages by foreign substances, such as grit, dust, cinder, or other
impurities, whereby in many instances considerable expense and loss of
time are involved. To this end I make and fit the body or barrel
entirely separate from the outside or shell of the injector and so insert
the former into the latter as to enable the barrel or interior part to be
taken out, examined, cleaned, and replaced in an almost infinitesimal
space of time without suspending or otherwise interfering with the
working of the steam boiler or generator with which the injector is
connected. In the side of the barrel I provide one hole or aperture for
admitting steam into the steam cone, one for admitting water into the
water cone, and one required for the overflow; each of these holes or
apertures corresponding to a similar opening in the shell of the injector,
and being face to face thereto during the working of the apparatus.
Diametrically opposite to the aforesaid steam aperture I make an opening,
by preference of a smaller diameter, and a similar one diametrically
opposite to the water aperture aforesaid, and by performing half a
revolution of the barrel, or turning the same 180 degrees, by means of a
handle or lever fitted to the barrel for that purpose I cause the last-
named two openings to come opposite the steam and water orifices in
the shell respectively, in consequence of which the water in the tank is
warmed and also the overflow shut off. I also provide a screw spindle
with a lever or wheel at its end for raising and lowering the steam cone
and thereby regulating the water supply. The body or barrel I so con-
nect with or fasten to the shell of the injector by means of bolts, screws,
or similar appliances, that by removing these I am enabled to take out
the barrel for the purpose of examining and cleaning it, and subsequently
to replace it in its normal position without disturbing any one of the pipe
joints or interfering with the boiler or generator.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said John Davis in the Great Seal Patent Office on
the 22nd November 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
DAVIS, of 176, Great Dover Street, in the Borough of Southwark, Civil 38
Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of May, in the
year of our Lord One thousand eight hundred and seventy-three, in
the thirty-sixth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said John Davis, Her special
licence that I, the said John Davis, my executors, administrators, and
assigns, or such others as I, the said John Davis, my executors, admi-
nistrators, 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 THE CON-
STRUCTION OF INJECTORS FOR FEEDING STEAM BOILERS," upon the condition
(amongst others) that I, the said John Davis, my executors or admini-
strators, by an instrument in writing under 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 Davis, do hereby declare
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 and accompanying Sheet of Drawings :-
This Invention has for its object to secure perfect continuity and
regularity in the working of the apparatus for supplying water to steam
boilers, commonly known by the name of "Giffard's injector," by
counteracting and entirely suppressing the drawbacks affecting this
apparatus in its present construction, that is to say, the necessity of first
deta ching or breaking and then restoring certain joints in order to remedy
the injury or damage accruing from time to time to the apparatus in
consequence of corrosion or of the obstruction or choking up of the
steam passages by foreign substances, such as grit, dust, cinder, or other
impurities, whereby in many instances considerable expense and loss of
time are involved. To this end I make and fit the body or barrel
entirely separate from the outside or shell of the injector, and so insert
the former into the latter as to enable the barrel or interior part to be.
taken out, examined, cleaned, and replaced in an almost infinitesimal:

page_text: space of time without suspending or otherwise interfering with the
working of the steam boiler or generator with which the injector is con-
nected. In the side of the barrel I provide one hole or aperture for
admitting steam into the steam cone, one for admitting water into the
water cone, and one required for the overflow; each of these holes or
apertures corresponding to a similar opening in the shell of the injector,
and being face to face thereto during the working of the apparatus.
Diametrically opposite to the aforesaid steam aperture I make an opening
by preference of a smaller diameter, and a similar one diametrically
opposite to the water aperture aforesaid, and by performing half a
revolution of the barrel, or turning the same one hundred and eighty
degrees, by means of a handle or lever fitted to the barrel for that
purpose I cause the last-named two openings to come opposite the steam
and water orifices in the shell respectively, in consequence of which the
water in the tank is warmed and also the overflow shut off. I also pro-
vide a screw spindle with a lever or wheel at its end for raising and
lowering the steam cone and thereby regulating the water supply. The
body or barrel I so connect with or fasten to the shell of the injector by
means of bolts, screws, or similar appliances as to be enabled by removing
these to take out the barrel for the purpose of examining and cleaning.
it, and subsequently to replace it in its normal position without disturbing
any one of the pipe joints or interfering with the boiler or generator.
In the accompanying Sheet of Drawings I have shewn a longitudinal
section of an injector constructed according to my Invention.
A is the shell or outside of the injector, which is connected in the
usual manner with the steam boiler or generator which it is intended to
supply; B is the aperture for the water supply pipe; C, for the over-
flow; and D, for the steam pipe. Within the bore of the shell A the
injector proper or barrel E is fitted, and rendered steam-tight by means
of a valve seating F, F; G and H are hollow conical plugs or steam
cones; of these the former is firmly seated within the lower part of the
barrel, the latter has a screw spindle I passing through its axis, which
may be turned by means of a hand wheel or similar appliance J fitted
thereto. At every twist of the screw spindle I the moveable hollow
cone H, the top part of which bears against the sides of the barrel, is
either raised or lowered, and the open space between the outside of the
cone H and the inside of the cone G being thereby respectively increased
or reduced in size, the motion of the spindle I serves to regulate the

page_text: quantity of water to be admitted through the supply pipe B. The same
object, that is to say the regulation or adjustment of the influx of water
through the supply pipe B, may be achieved likewise by fixing the upper
conical plug H in one and the same position, and so connecting the
lower cone G with any kind of mechanism, such as a rack and pinion,
an endless screw, or similar appliance, as to allow of its being raised or
lowered according to the requirements of the water supply. The whole
of the barrel is rendered air-tight, and secured to the shell A through
the stuffing box K, being connected with the top flange of the shell
by means of screws or bolts, not shewn in the Drawing, or else two such
valve seats as shewn at F, instead of one, may be introduced, and thereby
the stuffing box K rendered unnecessary for the purpose of hermetically
closing the barrel. The screw spindle I is also made air-tight and guided
in its course by means of the stuffing box L, which is secured with a
nut M. The lever N for which a hand wheel or other convenient
appliance may be substituted has for its object to enable the barrel or
injector proper to be turned round its axis. The two orifices O and P
are made on opposite sides of the barrel E, the axis of the orifice O being
in a line with that of the steam pipe opening D, and the axis of the
orifice P in a line with that of the water supply opening B. Half a
revolution of the barrel, performed by causing the hand lever N to
describe a semicircle, will bring these two orifices O and P opposite the
steam and water openings D and B respectively; a third orifice Q,
corresponding to the opening C, for the overflow will by the same move-
ment be brought round against the solid part of the shell, and by this
means the overflow will be shut off on the one hand, and on the other
hand the steam coming in through the orifice O will serve to heat the
water in the supply tank connected with the opening B.
In those cases in which it may appear necessary to lift the feed water
of the boiler or generator I provide a second screw spindle, passing con-
centrically through the spindle I, and which may be raised or lowered
by means of a second hand lever or wheel fitted thereto; and by working
this second spindle the feed water may then be raised to the level
required.
In those cases in which the lower cone G is raised or lowered by
means of an additional mechanism, as hercin-before pointed out, the
screw spindle I may be so modified in its configuration as to serve the
purpose of lifting the feed water.

page_text: Having now described the nature of my said Invention, and illustrated
the same in the accompanying Sheet of Drawings, I wish it to be under-
stood that I do not claim the use of conical plugs in the construction of
injectors for steam boilers or generators; but what I do claim is,--
First. The use or employment of a separate barrel or injector proper
fitted into and separable from a shell or casing attached to the steam
boiler or generator, substantially in the manner herein-before described,
and illustrated in the accompanying Sheet of Drawings.
Secondly. The mode and manner of opening and shutting off the
water supply, as descried in the foregoing, and illustrated in the accom- 1
panying Sheet of Drawings.
Thirdly. The mode and manner of shutting off the overflow aperture,
and thereby causing the steam to heat the water supply, as herein-before
described, and illustrated in the accompanying Sheet of Drawings.
In witness whereof, I, the said John Davis, have hereunto set my 1
hand and seal, this Twenty-first day of November, One thousand
eight hundred and seventy-three.
Witness,
J. T. DANN,
43, Cowley Road,
Brixton,
S.W.
(L.s.) JOHN DAVIS.