An Improved Furnace Door for Steam Boilers.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
An Improved Furnace Door for Steam Boilers.
LUKE RUSHWORTH, Engineer 218 Edge Lane, Droylsden, near Manchester
and ALBERT FLETCHER Cotton Spinner, Birch Mills, Ashton-under-Lyne, do
hereby declare the nature of this invention to be as follows:-
This improvement is in making the furnace door of a steam boiler in the form
of a swivel damper, with a hollow wing projecting towards the centre of the
furnace; the length of same being half the width of the said door. The aforesail
door having an opening into which is placed a damper to control the admission of
air passing through the aforesaid hollow wing, into the said furnace; the said
damper being closed by suitable mechanism actuated by the movement of the said
door. The aforesaid door carrying a lever on a line with the aforesaid wing for
the purpose of opening & closing the said door. The movement is as follows: The
lever being moved to the right, moves the right-hand side of the said door to the
centre of the furnace, and brings the aforesaid hollow wing to the position which
was the left hand side of the said door, while the left hand side of the said door
will be in a line with the furnace.
In this position of the said door the furnace will be able to be fed; the said door
being held in position by a catch and closed by a spring or weight.
There is suitable mechanism for controlling the time when the opposite movement
may take place and the furnace be fed.
Dated this 24th day of January 1896
LUKE RUSHWORTH.
ALBERT FLETCHER.
COMPLETE SPECIFICATION.
An Improved Furnace Door for Steam Boilers.
LUKE RUSHWORTH, Engineer 218 Edge Lane Droylsden ALBERT FLETCHER
Cotton Spinner Springfield Ashton-under-Lyne do hereby declare the nature of this
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 is in making the furnace door, of a steam boiler in the form of a
swivel damper T shaped with a hollow wing projecting in the centre of the furnace,
the length of same being half the width of said door. The aforesaid door has an
opening over which is placed a damper, to control the admission of air passing
through the aforesaid hollow wing into the said furnace the said damper being
closed by suitable mechanism.
The description of the accompanying drawing is as follows
Fig. 1. is a general view in which the furuace has just been fed.
Fig. 2. is a section through X. Y. showing the hollow wing and T shaped door.
Fig. 3. is a plan of cam from above.
L

page_text: a. b. c. is the T shaped swivel door, c. being the hollow wing through which
the air passes. d is the damper, e the cylinder & piston filled with oil to ensure
a slow descent. f is a cam to raise cylinder e., l, l, are catches to slide in slots
in cam f, for the purpose of fastening the door. h is a lever to open & k a spring
to close the door. 1. & 2 are pulleys to slide round cam f, 3 & 4, are guides to
keep the cylinder in its proper position.
The action is as follows.
When the cylinder has fallen so that the pulleys, 1 & 2 have pressed the
catches 1. l, out of the slots, the door may then be opened. The lever . is moved
to right hand of the furnace will put b. in centre of furnace when c will close left
side of furnace, the cam will have risen cylinder e & damper d. to the position
shown in Fig. 1. In this position the right side (only) of furnace. can be fed.
The lever . being released the spring k will close the door a. b. c. when the
catches 1. 1. will slide in the slots in cam f thus fastening the door, until the
cylinder e. which is slowly descending shall again release the catches 1, l, & then
the door may again be opened & the opposite side fed. The object of this
invention is to make it imperative, that the furnace can be fed on one side at a
time only. The same object may be gained by hinging two doors to a hollow
plate projecting in the furnace & fixed on the dead plate.
Having now particularly described & ascertained the nature of our inven-
tion & in what manner the same is to be performed we declare that what we
claim is :-
The use of the hollow T shaped swivel door.
LUKE RUSHWORTH.
ALBERT FLETCHER.