IMPROVEMENTS IN SCRAPERS AND IN MACHINERY FOD DATSTNA ANT TAWEDIVA AND LDERS DAR ATLA PROVISIONAL SPECIFICATION
Year: 1882

page_text: LETTERS PATENT to Arthur Lowcock of Shrewsbury in the County of Salop
Engineer and John Taylor of Salford in the County of Lancaster Engineer
and Millwright for an Invention of "IMPROVEMENTS IN SCRAPERS AND IN
MACHINERY FOD DATSTNA ANT TAWEDIVA AND LDERS DAR
ATLA
PROVISIONAL SPECIFICATION left by the said Arthur Lowcock and John
Taylor at the Office of the Commissioners of Patents on the 12th July 1882.
ARTHUR LOWCOCK of Shrewsbury in the County of Salop Engineer and JOHN
TAYLOR of Salford in the County of Lancaster Engineer and Millwright.
"IMPROVEMENTS IN SCRAPERS AND IN MACHINERY FOR RAISING AND LOWERING
SCRAPERS FOR CLEANSING FLUES AND TUBES OF BOILERS ECONOMISERS AND HEATING
APPARATUS
"
In performing our invention we attach to the under side of the lifting bars of
the scrapers sheets of iron that descend between the spaces between the lower parts
of the tubes and prevent the accumulation of soot. To give motion to the scrapers
we employ a counter shaft that may be driven in one direction by an open belt
and in the other direction by a cross belt-on the counter shaft are fast and loose
pulleys for these belts to run on, or it may be driven by gears-this counter shaft
gives motion to the shaft which drives by worms and wheels or otherwise the.
wheels which actuate the chains for raising and lowering the scrapers that scrape
the tubes of the economiser; this shaft also gives motion to a disc on which are
adjustable cams or projections that move a weighted lever connected to the strap
forks to place one strap on a fast pulley of the counter shaft to drive the shaft in
one direction to raise the scrapers and that move the weighted lever and strap
forks to place the one strap on a loose pulley and the other strap on a fast pulley
to reverse the motion and lower the scrapers: when we employ worms for com-
municating motion to the chain wheels, each worm rests in a worm box with
bearings at each side for the worm shaft and faced to form surfaces for the ends
of the worm to bear against. The strap guides are fixed on a bar in which is a
slot and the weighted lever is connected to a bar on which is a pin which enters
the slot so that the lever may be moved over the centre before moving the straps.

page_text: 1
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Arthur Lowcock and John Taylor in the Great Seal Patent Office
on the 11th January 1883.
ARTHUR LOWCOCK of Shrewsbury in the County of Salop Engineer and JOHN
TAYLOR of Salford in the County of Lancaster Engineer and Millwright.
"IMPROVEMENTS IN SCRAPERS AND IN MACHINERY FOR RAISING AND LOWERING
SCRAPERS FOR CLEANSING FLUES AND TUBES OF BOILERS, ECONOMISERS AND HEATING
APPARATUS."
In performing our invention we attach to the underside of the lifting bars of the
"scrapers, sheets of iron that descend between the spaces between the lower parts of
-the tubes and prevent the accumulation of soot. To give motion to the scrapers
we employ a countershaft that may be driven in one direction by an open belt and
in the other.direction by a cross belt. On the counter shaft are fast and loose
pulleys for these belts to run on, or it may be driven by gears. The countershaft
gives motion to the shaft which drives (by worms and wheels or otherwise) the
wheels which actuate the chains for raising and lowering the scrapers that scrape
the tubes of the economiser. This shaft also gives motion to a disc on which are
adjustable cams or projections that move a weighted lever connected to the strap
forks to place one belt on a fast pulley of the countershaft to drive the shaft in
one direction to raise the scrapers and that move the weighted lever and strap
forks to place the one strap on a loose pulley and the other strap on a fast pulley
to reverse the motion and lower the scrapers. When we employ worms for com-
municating motion to the chain wheels, each worm rests in a worm box with
bearings at each side for the worm shaft and faced to form surfaces for the ends of
the worm to bear against. The strap guides are fixed on a bar in which is a slot
and the weighted lever is connected to a bar on which is a pin which enters the
slot so that the lever may be moved over the centre before moving the straps.
And in order that our invention may be fully understood and readily carried
'into effect we will describe the accompanying sheet of drawings reference being
had to the figures and letters marked thereon.
Fig. 1 is an end elevation. Fig. 2 a side elevation and Fig. 3 a plan of our
improved apparatus. Fig. 4 is a plan of the strap fork guides. Fig. 5 is an end
view and Fig. 6 an elevation of a worm box and worm.
On Figs. 1, 2, 3 and 4-a is the countershaft driven in one direction by an open
belt and in the other direction by a cross belt.
On the countershaft a is a fast pulley a¹ and two loose pulleys a³ a³ for these
-belts to run over.
A bevel pinion a³ is fixed to the shaft a and communicates motion to the
shaft 6 through a bevel wheel 6¹ keyed to the shaft b: The worm b³ keyed to the
shaft b gives motion to a worm wheel c (on the stud c²) to which is secured &
wheel carrying the chains c³ for actuating the lifting bars d and scrapers. The
·scrapers are secured to the lifting bars d in the ordinary manner, Sheets of
iron d¹ are fixed to the underside of the lifting bars & which descend (when the
⚫chains c are actuated) and enter the spaces between the bottom horizontal tubes
and thus prevent the accumulation of soot.
The motion of the scrapers and of the whole apparatus is reversed by means of
the worm b³.keyed to the shaft b. which gives motion to a worm wheel e keyed on
.a shaft'e': on the upper end of the shaft e¹ is keyed a bevel pinione which gears
and drives a bevel wheel secured to the shaft f¹: at the other end of the shaft f¹
is fixed a disc g: on the face of the disc g are two adjustable cams g' and g³ which
alternately come into contact (driving each partial revolution of the disc g) with a

page_text: catch or striking plate h' secured to an upright weighted lever h pivoted at its
lower end to the frame and move with it over the centre of the disc g. To the
lever h. is jointed one end of a bar i and the other end is supported in brackets i¹:
a stud is bolted to that part of the bar & which is between the brackets i¹ and
enters a slot j cut in a bar j' which slides in brackets ¹ and to which the strap
forks are secured. When the lever h has been moved over the centre of the
disc g the bar i and stud i have travelled the length of the slot j in the bar j¹ and
the weight of the top of the lever h causes it to descend rapidly and at the same
moment the stud comes against the bar and moves it and the strap forks k k'
thereby changing the belt on the fast pulley a' and thus reversing the motion of
the scrapers and the rest of the apparatus: the cam g³ then comes into contact
with the weighted lever hand moves it back over the centre of the disc g and thus
again changes the belt on the fast pulley a¹ and reverses the motion.
In Figs. 5 and 6-7 is our improved worm box having bearings at each side for
the worm shaft b and faced to form surfaces for the ends of the worm to bear
against. The box box / holds a supply of oil or other lubricant.
Having stated the nature of our invention and described the manner of
performing the same we would have it understood that we do not limit ourselves
to the details given as they may be varied or modified and―
We declare that we claim.
1.-The use or employment of metal sheets secured to the under sides of the
lifting bars to prevent the accumulation of soot between the lower parts of the
tubes as herein described.
2.-The improved mechanism for raising and lowering the scrapers substantially
as herein shown and described.
3.―The improved worm box as shown and described.
In witness whereof we the said Arthur Lowcock and John Taylor have
hereunto set our hands and seals this tenth day of January One thousand
eight hundred and eighty three.
ARTHUR LOWCOCK (LS.)
JOHN TAYLOR
(L.S.)