Improvements in Apparatus for Turning Engines over their Centres when combined with "Root's Blowers," Pumps, or the like.
Year: 1893

page_text: Date of Application, 2nd Mar., 1893
Complete Specification Left, 4th Dec., 1893-Accepted, 6th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Turning Engines over their Centres
when combined with "Root's Blowers," Pumps, or the like.
I, ARTHUR DEVONSHIRE ELLIS, Managing Director of Thwaites Brothers,
Limited, of Thornton Road, Bradford, in the County of York, Engineers, do hereby
declare the nature of this invention to be as follows:-
This invention has for its object, the construction of an apparatus and combining
same with "Roots blowers" pumps or the like when driven by steam engines in
such a manner that, the moving parts of the machine may be turned into any
position for examination when not under steam, or for moving the cranks of the
engine over the dead centres when starting the engine, and to so arrange the
turning or starting apparatus that, the same shall be automatically removed out of
gear with the machine, on the latter obtaining a higher speed or number of
revolutions than the motion given thereto by the operation of the improved
apparatus.
I accomplish my object by securing to one of the shafts of a "Roots blower,"
pump or the like, a worm wheel, and gearing therewith a worm supported by a
spindle mounted on a suitable bracket. The worm is mounted on the spindle so
that it will slide along a feather key, and in such a way that, on engaging the worm
with the worm wheel, and turning the former in one direction, the worm wheel is
put in motion thereby turning the moving parts of the machine, and carrying the
cranks of the engine over the dead centres, and when the machine or engine
obtains a greater speed than the speed given to the same by the worm, the worm
wheel causes the worm to slide on the spindle such a distance that it is clear of the
said wheel, when the machine is then left to run freely in the ordinary manner
without any further engagement or gearing between the worm and worm wheel.
Dated this 1st day of March 1893.
JOHN WAUGH,
Agent.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Turning Engines over their Centres
when combined with "Root's Blowers," Pumps, or the like.
I, ARTHUR DEVONSHIRE ELLIS Managing Director of Thwaites Brothers,
Limited, of Thornton Road, Bradford, in the County of York, 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 :-
This invention has for its object the construction of an apparatus and combining
same with "Root's blowers," pumps, or the like, when driven by steam engines,
in such a manner, that, the moving parts of the machine may be turned into any
position for examination, when not under steam, or for moving the cranks of the
engine over the dead centres when starting, and to so arrange the turning or starting
apparatus, that, the same shall be automatically removed out of gear with the
machine, on the latter obtaining a higher speed or number of revolutions than the
motion given thereto by the operation of the improved apparatus,

page_text: In order that my invention may be fully understood I will describe the same in
detail by making reference to the accompanying sheet of drawings in which,
Fig. 1 represents a front view of my apparatus as attached to a
"Root's
blower."
Fig. 2 a similar view shewing the apparatus out of gear.
Fig. 3 is a plan, and
Fig. 4 a side view of the apparatus.
,י
To the shaft A. of the "Root's blower" I secure a worm wheel B. and gearing
therewith a worm C. supported by a spindle D. mounted in a suitable bracket E.
attached to the frame of the "Root's blower or the like in any convenient manner.
When it is desired to operate the "Root's blower" or the like, the worm C.
mounted on the spindle D. and free to slide along the feather key F. is raised from
the position shewn by Fig. 2 so as to engage with the worm wheel B, and by turning
the hand wheel G. secured to the spindle D. the worm C. is further raised, and
will have operated the worm wheel B. such a distance in the direction of arrow, as
to turn the moving parts of the "blower," or the like, and carry the cranks of
the engine over the dead centre. On the engine obtaining a greater speed, by
reason of the steam in the cylinder, than the speed given to the same by the worm C.
the worm wheel B causes the worm C. to slide down the spindle D. such a distance
as to disengage with the said worm wheel B. as shewn by Fig. 2, when the machine
is then left to run freely in the ordinary manner without any further engagement
or gearing between the worm C. and worm wheel B.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
A worm wheel B. secured upon the shaft A. of a "Root's blower," or the like,
combined with a worm C. mounted upon a spindle D. having a feather key F.
secured therein, all arranged and mounted substantially in the manner and for the
purpose as herein before set forth.
Dated this 1st day of December 1893
JOHN WAUGH,
Agent.