Improvements in or connected with Pump Gear.
Year: 1890

page_text: Date of Application, 21st Apr., 1890
Complete Specification Left, 16th Jan., 1891-Accepted, 21st Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in or connected with Pump Gear.
I, GEORGE FLETCHER, of Masson Works, Litchurch, in the County of Derby,
Engineer, do hereby declare the nature of this invention to be as follows :-
This invention of improvements in or connected with pump gear has reference to
an apparatus whereby the stroke of a reciprocating pump may be altered at will
when at work without disconnecting or stopping the gear from which it derives its
motion.
In carrying out my invention I employ a bar, lever, or slot link passing through
and free to slide backwards or forwards in a sliding block; the sides of this block
are so extended as to work in an eye or bearing at the end of the pump rod or
plunger. One end of the bar or lever, or slot link is connected to a rod which is
worked by a crank or an eccentric of the required throw, while the other end of
the bar or lever or slot link is connected to a rod which I call the supporting rod
suspended from the shaft working the crank or eccentric or from a pin or stud fixed
on or as near to the centre line of the said shaft as is convenient. The pin
connecting the supporting rod to the bar, lever, or slot link I call the fulcrum
pin; the stroke of the pump is proportionate to the distance that the fulcrum pin is
from the sliding block or centre line of the pump. For adjusting the distance of
the fulcrum pin from the sliding block or centre of the pump so as to obtain the
required stroke I form at one end of the fulcrum pin a boss, through which passes a
spindle with hand wheel attached and free to revolve in the same, this spindle is
also screwed into a suitable boss at the side of the sliding block so that by turning
the hand wheel the fulcrum and supporting rod are brought nearer to, or further
from the sliding block or centre of the pump thereby reducing or increasing the
stroke of the pump. Or to one of the pins which connect either the supporting
rod, or the eccentric rod to the bar, or lever, or slot link, I connect one end of a rod
or drag link on one or both sides of the bar, lever, or slot link, I make these rods
or drag links of a convenient length and to the other end of the same I attach a
hand lever or a lever worked by a hand wheel and screw. I am thus enabled to
adjust the distance of the fulcrum pin from the sliding block or centre of the pump
and so obtain the required stroke.
Dated the 91st dow of Anvil 1800
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Pump Gear.
I, GEORGE FLETCHER, of Masson Works, Litchurch, in the County of Derby,
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 of improvements in or connected with pump gear has reference to
an apparatus whereby the stroke of a reciprocating pump may be altered at will
when at work without disconnecting or stopping the gear from which it derives its
motion.
In carrying out my invention I employ a bar, lever or slot link passing through
and free to slide backwards and forwards in a sliding block; the sides of this block

page_text: are so extended as to work in an eye or bearing at the end of the pump rod or
plunger. One end of the bar, lever, or slot link is connected to a rod which is
worked by a crank or an eccentric of the required throw, while the other end of
the bar, lever or slot link is connected to a rod, which call the supporting rod,
suspended from the shaft working the crank or eccentric or from a pin or stud fixed
on, or as near to, the centre line of the said shaft as is convenient. The pin
connecting the supporting rod to the bar, lever or slot link I call the fulcrum pin.
The stroke of the pump is proportionate to the distance that the fulcrum più is
from the sliding block or centre line of the pump. For adjusting the distance of
the fulcrum pin from the sliding block or centre of the pump so as to obtain the
required stroke I form at one end of the fulcrum pin a boss, through which passes
a spindle with hand wheel attached and free to revolve in the same, this spindle is
also screwed into a suitable boss at the side of the sliding block so that by turning
the hand wheel the fulcrum and supporting rod are brought nearer to, or further
from the sliding block or centre of the pump thereby reducing or increasing the
stroke of the pump.
Or to one of the pins which connect either the supporting rod, or the eccentric
rod to the bar, or lever, or slot link, I connect one end of a rod or drag link on one
or both sides of the bar, lever, or slot link. 1 make these rods or drag links of a
convenient length and to the other end of the same I attach a hand lever or a lever
worked by a hand wheel and screw. I am thus enabled to adjust the distance of
the fulcrum pin from the sliding block or centre of the pump and so obtain the
required stroke.
Or instead of effecting the adjustment of the fulcrum pin by the means herein-
before described the fulcrum pin may be adapted to be adjustably fixed in a
stationary, grooved or slotted plate; or the fulcrum pin may be fixed in a lever the
position of which may be altered at will. In these latter cases no supporting rod
is required.
In order to enable my invention to be fully understood I will describe how it can
be carried into practice by reference to the accompanying drawings, in which
Figure 1 is an end elevation of pump gear constructed according to my invention
the supporting rod being suspended from the driving shaft and the adjustment of
the stroke being effected by means of a screw and hand wheel attached to the bar,
lever or slot link.
Figure 2 is a side elevation of Figure 1.
Figure 3 is a sectional plan of Figure 1.
Figure 4 is an elevation illustrating the said gear worked by double eccentrics.
Figures 5 and 6 are a side elevation and sectional plan of Figure 4.
Figures 7 and 8 are respectively an elevation and a sectional plan of my improved
pump gear showing how the adjustment can be effected by means of side rods or
drag links connected to a hand lever.
Figures 9 and 1 are similar views but shewing how the adjustment can be
effected by means of side rods or drag links connected to a lever worked by a screw
and hand wheel.
Figures 11 and 12 are also similar views but shewing the modification in which
the adjustment is effected by the fulcrum pin being adjustable in a stationary
grooved or slotted plate.
Similar reference letters indicate corresponding parts throughout the drawings.
I will first describe.my invention by reference to Figures 1, 2 and 3.
A is the bar, lever or slot link passing through the sliding block B the sides of
which are extended through the eye or bearing C at the end of the pump rod or
plunger D. F is the rod to which the end E of the bar, lever or slot link A is
connected and by which a reciprocating motion is given to the bar, lever or slot
link A. from the eccentric G as shewn or from a crank or a pin fixed in a disc.
His the fulcrum pin which connects the supporting rod J to the bar, lever or slot
link A, this supporting rod J being suspended from the shaft which works the
eccentric or crank. Or it may be suspended from some point not on the shaft but

page_text: as near to it as convenient. K is the boss at one end of the fulcrum pin H in which
boss is the screw-threaded spindle L which is screwed into the boss M at the side
of the sliding block B. N is the hand wheel at the end of the spindle L for
working it.
By turning the hand wheel N in one or the other direction the fulcrum pin H is
caused to be moved nearer to or further from the centre of the pump and by this
means the stroke of the pump can be reduced or increased at will while the pump is
in motion or at rest.
In Figures 4, 5 and 6 two eccentrics G and G¹ are shewn for giving the recipro-
cating motion to the pump, the supporting rod J being suspended from the
eccentric Ginstead of from the shaft as hereinbefore described. The adjustment
of stroke is effected by the same means as those herein before described but in this
case the pump has no motion when the ends of the eccentric rods are equidistant
from the centre line of the pump.
Referring to Figures 7 and 8, 0, 0 are the side rods or drag links connected to
the pin which unites the ends of the eccentric rod F and bar, lever or slot link A,
the side rods or drag links O, O being connected at their other extremity to a hand
lever which can be secured in any required position by means of a catch taking
into a quadrant as shown or by any other convenient method-the reciprocating
motion being given to the pump by any of the means herein described.
In Figures 9 and 10 the side rods or drag links OO are connected to the pin
which unites the ends of the eccentric rod F and bar lever or slot link A and are
also connected at their other extremity R to a lever Q which is worked by a hand
wheel and screw as shown or by any other convenient arrangement of screw and
hand wheel, the reciprocating motion being given to the pump by any of the means
herein described.
In Figures 11 and 12, a is the bar, lever or slot link passing through the sliding
block b, the sides of which are extended through the eye or bearing c at the end of
the pump rod or plunger d; the end e of the bar, lever or slot link a is connected to
the rod by which a reciprocating motion is given to the bar, lever or slot link a
from the eccentric g as shown or from a crank or a pin fixed in a disc; h is the
fulcrum pin which may be fixed in any convenient position in the slot ; the
position of this pin can then be altered to suit the required stroke of the pump, or
the fulcrum pin may be attached to a lever, the position of which can be altered at
will, a hand wheel and screw or other convenient means being employed for adjusting
the position of the fulcrum pin.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
(1) In apparatus for adjusting the stroke of a reciprocating pump the arrange-
ment in which the reciprocating motion is transmitted by a bar, lever or slot link
worked by a rod attached to one extremity and which rod derives its motion from
a crank, an eccentric or a pin in a disc, the other extremity of the bar, lever or slot
link being attached to a supporting rod, suspended from the shaft or from a pin on
or near the centre of the shaft substantially as hereinbefore described and illustrated
in Figures 1, 2 and 3 of the accompanying drawings.
(2) In apparatus for adjusting the stroke of a reciprocating pump, the arrange-
ment in which the reciprocating motion is transmitted by a bar, lever or slot link
worked by rods attached to each end thereof, each of which rods derives its motion
from an eccentric substantially as hereinbefore described. and illustrated in
Figures 4, 5 and 6 of the accompanying drawings.
(3) In apparatus for adjusting the stroke of a reciprocating pump the arrange-
ment in which the adjustment of the position of a bar, lever or slot link in a sliding
block is effected by means of a screw attached thereto and worked by a hand wheel
substantially as hereinbefore described and illustrated in Figures 1 to 6 of the
accompanying drawings.

page_text: (4) In apparatus for adjusting the stroke of a reciprocating pump, the arrange-
ment whereby the adjustment of the position of the bar, lever or slot link in the
sliding block is effected by means of side rods or drag links attached to a hand lever
substantially as hereinbefore described and illustrated in Figures 7 and 8 of the
accompanying drawings.
(5) In apparatus for adjusting the stroke of a reciprocating pump, the arrange-
ment whereby the adjustment of the bar, lever or slot link in the sliding block is
effected by means of side rods or drag links attached to a lever worked by a screw
and hand wheel substantially as hereinbefore described and illustrated in Figures 9
and 10 of the accompanying drawings.
(6) In apparatus for adjusting the stroke of a reciprocating pump the arrange-
ment wherein the reciprocating motion is transmitted by a bar, lever or slot link
worked by a rod, attached to one extremity and which rod derives its motion from
a crank, eccentric, or pin in a disc, the other extremity of the bar, lever or slot link
being attached to a fulcrum pin adjustable in a plate as hereinbefore described
with reference to Figures 11 and 12 or to an adjustable lever as herein set forth.
(7) The combination with any of the means herein described by which the pump
derives its reciprocating motion of any of the herein described means whereby the
position of the bar, lever or slot link adjusted in the sliding block and which
position determines the stroke of the pump.
(8) The manufacture and use of the improved apparatus or pump gear herein-
before described and illustrated in the accompanying drawings.
12
1
T
1001
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.