Improvements in Gearing for Driving Pumps
Year: 1892

page_text: Date of Application, 4th Feb., 1892-Accepted, 23rd Apr., 1892
COMPLETE SPECIFICATION.
Improvements in Gearing for Driving Pumps,
I, JOHN EDWARD TOUCH of Carlyle Street, Sydenham, Christchurch, in the
Colony of New Zealand, 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 :-
My invention relates to improvements in gearing for driving pumps, and has for
its objects transmitting the driving power more efficiently and with simpler
mechanism. It is well known that in driving pumps which have a reciprocating
motion the work to be done is unevenly distributed throughout the delivery and
the return stroke more especially in pumps which have single action and a single
barrel; for in such pumps the lift generally takes place during one stroke in which
the power is applied to lifting the whole weight, but during the other stroke the
power required is small being chiefly employed in simply returning the rods and
bucket ready for the next lift.
In windmills and water wheels and where motive power whether effectively used
or not is being constantly supplied great waste of power takes place on the return
stroke of the pump without a corresponding useful effect, and several devices
have been made use of and suggested to utilise and distribute the power more
equally, and the object of my invention is to effect this by more simple means.
attain this object by the mechanism illustrated in the accompanying drawing in
which:
I
Figure 1 is an elevation shewing my improved gearing in which two driving
pinions with varying radii are employed and arranged side by side and two
segments of driving wheels with varying radii are made to gear into the same
and in such a manner and position as to give a slow lift to the pump.
Figure 2 is a plan of the same.
Figures 3 and 4 are an elevation and plan of the same shewing similar gearing
in another position so as to give a quick return stroke.
Figure 5 is an elevation shewing another modification of my improved gearing
in which each of the driving pinions performs its revolution and work alternately.
Figure 6 is a plan of the same.
Figure 7 is an elevation shewing my improved gearing arranged as a spiral so
as to give the like results as the gearing represented in the other views, but with
a continuous action of the spiral pinion upon a spiral wheel with the same variable
distribution of force.
Figure 8 is a plan of the same.
Referring to Figures 1 and 2 it will be seen that my invention consists in so
designing and arranging the gearing that in one complete delivery and return
stroke of the pump or revolution of the segment B and B which produce the
said delivery and return strokes, the windmill shaft on which the pinions A and A'
are fixed makes two revolutions thus increasing the power and consequently
decreasing the speed of the pump; but the pinions A and A' are fixed relatively
to one another in such a position that the teeth on the pinion A which have the
smallest radius from the axle, commence to gear with the teeth on the segment B
having the largest radius from its axle, thus giving a great increase of power in
lifting at the half stroke of the pump, but gradually diminishing such power to
the end of the stroke. After which the return stroke commences until at the half
return stroke the teeth having the largest radius from the axle or pinion A¹ gear
into the teeth having the smallest radius on the segment B', thus allowing the
smallest amount of power to be used and the quickest speed attained on the return
stroke.

page_text: I thus attain in a simple manner one revolution of the driven pump wheel to
two revolutions of the driving pinion, and this varied in such a manner throughout
the revolutions that very great power is available to lift and deliver, and a
proportionately small power exerted in returning for a fresh lift.
In Figures 5 and 6 is shewn a modification of the same gearing in which as
herein before stated the one complete revolution of each pinion takes effect upon
the wheel segments alternately, and in Figures 7 and 8 is shewn an alternative
arrangement in which the pinion and wheel are both arranged in a spiral form
producing the same result.
It will thus be seen that my improved gearing not only alters the speed of the
delivery and return stroke of the pump and consequently the power exerted on
the same, but will also enable the stroke of the pump to be slackened and the
revolution of the windmill to be proportionately increased; also that by increasing
the number of pinions or length of spiral wheels and proportionately increasing the
size and number of the driven segments, any desired proportion of the speeds may
be attained
I am aware that some of the advantages in gearing sought to be effected by
me have been obtained by others in several ways all more or less complicated.
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 :
The gearing made in either spur or spiral form as and for the purposes,
substantially as described herein and illustrated in the accompanying drawings.
Dated this 4th day of February 1892.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.