Rag Boilers and Rotative Furnaces or the like.
Year: 1885

page_text: Rag Boilers and Rotative Furnaces or the like.
I GEORGE BENTLEY and JOHN BROAD JACKSON of the Firm of Bentley and
Jackson of Bury near Manchester in the County of Lancaster Engineers do hereby
declare the nature of this Invention to be as follows:-
The object of this Invention is to provide simple and effective means for trans-
mitting motion from a shaft having a high velocity to rag boilers or rotative
furnaces or the like which it is necessary to rotate slowly. We employ according
to this Invention differential gearing which consists of a shaft supported in any
suitable way-On this shaft is mounted a freely revolving eccentric and on this
eccentric is carried a pinion which also can revolve freely. The said pinion gears
with two internally toothed wheels each of a width about one half that of the
pinion. One of these wheels has a larger number of teeth than the other and one
of them is firmly keyed on the aforesaid shaft whilst the other is held stationary
and may form the cover of the box in which the gear is enclosed and also an
outside bearing for the aforesaid eccentric and shaft A driving pulley is fixed on
the eccentric and a loose pulley may be placed on the outer end of the shaft.
i
When motion is given to the eccentric by means of the driving pulley the pinion
on the eccentric describes a circle around the central shaft and inside the internally
toothed wheels with both of which it engages. As one of the said wheels is held
stationary the pinion revolves on the eccentric and gives motion to the shaft
through the other of the internally toothed wheels, the speed of rotation of the
shaft relatively to that transmitted to the driving pulley being in accordance with
the difference in the number of teeth in the two internally toothed wheels. The
motion thus reduced may be transmitted to the trunnions or axis or body of the
rag boiler or furnace or the like by a pinion on the shaft and a spur wheel on
the trunnion axis or body and the speed be thus further reduced. If desired a
similar arrangement can be used but with external instead of internal gearing the
pinion being carried on a stud and one of the wheels with which it engages being
held stationary so that the operation will be substantially the same as hereinbefore
described.

page_text: Rag Boilers and Rotative] Furnaces or the like.
We GEORGE BENTLEY and JOHN BROAD JACKSON of the firm of Bentley and
Jackson of Bury near Manchester in the County of Lancaster Engineers 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:-
The object of this Invention is to provide simple and efficient means for trans-
mitting motion to rag boilers or rotative furnaces or the like which it is necessary to
rotate slowly from a shaft having a high velocity.
We will explain our Invention with reference to the accompanying Drawing
whereon Figure 1 shews a rag boiler provided with means for driving it according
to our Invention.
Figure 2 is a longitudinal section of the gear for transmitting the driving motion
to the boiler and Figure shews a face view of the gear wheels. From the
following description of the application of the Invention to a rag boiler its
application to analogous uses will be understood without further description.
According to this Invention we employ differential gearing which consists of a
shaft A supported in any suitable way for example by the bracket B which is
shewn as adapted for being bolted to one of the standards in which the boiler
trunnions are supported. On this shaft A. is mounted a freely revolving eccentric F
and on this eccentric is carried a pinion E which also can revolve freely. The said
pinion E gears with two internally toothed wheels C and D each of a width about
one half that of the pinion E. One of these wheels (that D) has a larger number
of teeth than the other (say one or two more teeth) and this wheel D is firmly
keyed on the aforesaid shaft A whilst the other wheel C is held stationary (it is
shewn bolted to the bracket B) and may form the cover of the box in which the
gear is enclosed (which box is shewn as formed in one with the bracket B) and also
an outside bearing for the aforesaid eccentric and shaft as shewn clearly in Figure 2.
A driving pulley G is fixed on the boss of the eccentric F and a loose pulley H
may be placed on the outer end of the shaft. When motion is given to the
eccentric F by means of the driving pulley G the pinion E on the said eccentric
describes a circle around the central shaft A and inside the internally toothed
wheels C and D with both of which it engages. As one of the said wheels is held
stationary the pinion revolves on the eccentric F and gives motion to the shaft A
through the other of the internally toothed wheels, the speed of rotation of the
said shaft relatively to that transmitted to the driving pulley being in accordance
with the difference in the number of teeth of the two internally toothed wheels C
and D. The motion thus reduced may be transmitted to the trunnions or axis or
body of the rag boiler or furnace or the like by a pinion I on the shaft A and a
spur wheel (J Figure 1) on the trunnion axis or body and the speed be thus further
reduced. If desired a similar arrangement can be used but with external instead

page_text: of internal gearing the pinion being carried on a stud and one of the wheels with
which it engages being held stationary so that the operation will be substantially
the same as herein before described.
Apparatus provided with our Invention presents the advantages of simplicity
cleanliness compactness and a higher initial speed as compared with the worm and
wheel usually used for the purpose of rotating rag boilers rotative furnaces and the
like whilst there is an efficient locking if the strap breaks or unships the pinion
then preventing the apparatus from running back.
Having now particularly described and ascertained the nature of our said
Invention and the manner in which the same is to be performed we declare that
what we claim is
In combination with rag boilers rotative furnaces or the like the means for
transmitting motion thereto substantially as described.