improvements in or relating to Mechanical Stokers.
Year: 1897

page_text: Date of Application, 10th Mar., 1897
Complete Specification Left, 9th Dec., 1897-Accepted, 15th Jan., 1898
improvements in or relating to Mechanical Stokers.
I, THOMAS ANDREWS, of 81 Great Clowes Street, Manchester, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an Improvement in helix feeders such as are employed
in mechanical stokers and described in the specifications of my patents No. 4904 of
1889 and No. 5391 of 1895. The object of this my invention is to prevent an
accumulation of fuel at the rear ends of the troughs or cases in which the helical
feeding screws are contained.
I construct a helical furnace feeding screw with either a right or a left hand
web or thread cast either on a solid shaft, or as represented in the above first named
patent, the front portion of said screw being preferably parallel and tapering
towards the rear end, but at a short distance from the termination of the screw
thread or web at the rear end, the direction of the web or thread is reversed, i.e. if
the front portion is formed with a right hand thread, the rear portion for a short
distance from the rear end is formed with a left hand web or thread, or if the front
portion of the screw is formed with a left hand thread, the rear portion is formed
for a short distance from the rear end with a right hand web or thread: By these
means any coal or fuel that is conveyed to the rear end of the case or trough con-
taining the aforesaid helical feeding screw is raised up into the incandescent fuel,
and an accumulation of coal or coal slack at the rear end of said case is prevented.
The ends of the aforesaid helix furnace feeders are formed so as to work in bearings
as heretofore.
Improvements in or relating to Mechanical Stokers.
I, THOMAS ANDREWS, of 81 Great Clowes Street, Manchester, in the County of
0 Lancaster, Engineer, 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 relates to an improvement in furnace feeding screws or helix
feeders such as are employed in mechanical stokers in the manner and for the
5 purpose described in the specifications of my patents No 4904 of 1889 and No 5291
Гр

page_text: of 1895
The object of this my invention is to prevent an accumulation of fuel at
the rear ends of the troughs or cases in which the aforesaid helical feeding screws
are contained. I attain this object by the means hereinafter described, reference
being made to the accompanying sheet of drawings, in which the several figures
shown thereon illustrate representative forms of furnace feeding screws or helix
feeders constructed according to this my invention. In these views similar letters
refer to similar parts. I construct a helical furnace feeding screw with either a
single or double right or left hand web or thread cast either on a solid shaft as b
represented in Fig. 1, or a tubular screw as shown in Fig. 2, or a screw made in
sections as b', and fitted on a square rod or tube c as Fig. 3, or otherwise
constructed, the first portion of said screw being preferably parallel and tapering
towards the rear end, but at a short distance from the termination of the screw
thread or web at the rear end, the direction of the web or thread is reversed,
i.e. if the front portion is formed with a right hand thread as a Figs. 1 and 2, the
rear portion a¹ for a short distance from the rear end is formed with a left hand web
or thread, or if the front portion of the screw is formed with a left hand thread, the
rear portion is formed for a short distance from the rear end with a right hand
web or thread, or a section as 65 with a reverse thread is placed on the rear end of a
rod or tube c as in Fig. 3. By these means the fuel which is carried to the rear
end of the furnace by the herein before described helix feeders is by the action
of the reversed thread or web at the termination thereof raised up, and is prevented
from being formed into a solid mass and straining or breaking the screw. The
ends of the aforesaid helix feeders are formed so as to work in bearings and prevent
wearing or scraping at the bottom of the screw case. I do not confine myself to
the precise forms of screw shown on the drawings, as these may be varied as may
be preferred, but,
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed, I declare that what I
claim is:-
1st. In furnace feeding screws such as are employed in mechanical stokers, a
thread or web termination at the rear end of said screws that is the reverse to that
which forms the main portion of the screw, substantially as and for the purpose
herein before described.
2nd. In furnace feeding screws that are built up in parallel or tapered sections
and secured upon a hollow rod or tube, or upon a solid bar, the termination of the
rear end of said screw by the rear end section being formed with a thread or web
of a reverse construction to the other sections forming the main portion of the screw,
substantially as and in the manner herein before described.
Dated this 8th day or 1000M now DANK
THOMAS PRESCOTT,
53 Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicant.