Improvements in Boiler-pumps
Year: 1890

page_text: Date of Application, 1st Mar., 1890-Accepted, 26th Apr., 1890
COMPLETE SPECIFICATION.
Improvements in Boiler-pumps."
1, AUGUST MÜLLER, Spinning Director, of Chrianstadt, Bober, in the Kingdom of
Prussia and German Empire, do hereby declare the nature of the said Invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :—
It has not heretofore been possible to feed a boiler under pressure with water
of 80 to 100° C. temperature, if this was to be done by pumps. The object of this
invention is to produce a boiler pump which renders this possible and besides slow
and reliable operation in feeding the boiler, has means for changing the stroke of the
plunger by composite toothed gearing. This affords great facility in firing or feeding
the furnace and effects a saving in coal to the extent of about 30 to 35%
The improved boiler pump is illustrated on the accompanying drawings.
Fig. 1. represents an elevation thereof with the toothed gearing above the same.
Fig. 2. represents a plan view of the gearing and its disengaging mechanism..
Fig. 3. represents vertical section on the line x-x. Fig. 2.
Fig. 4. represents a plan view of the pump.
Fig. 5. represents the toothed gearing connected with the belt pulley III.
Fig. 6. represents a similar view of the connection with the pulley I.
Fig. 7. represents a modification of Fig. 5.
i
Fig. 8. represents a section through the lever, e, guiding the fork, k, and disc ƒ.
And Fig. 9. represents a section through the stuffing box.
The arrangement of this boiler pump is as follows.
In the pump barrel, A, fitted with two suction valves, C, and two pressure valves, D,
moves the plunger, B, whose rod, a, has a device, b, c, b', for guiding it in a straight line.
To the rod, a, is secured a driving bar, g, which extends to the upper part of the
apparatus where it gears with the toothed wheel, m, keyed on the shaft u. By
suitable means of transmission consisting of the wheels n, o, p, q, and n¹, o¹, o", p¹ q¹
respectively the wheel m, and shaft u, are connected with pulley-gearing consisting
of two fixed pulleys I, III, and an intermediate loose pulley II.
To the driving bar, g, is secured an angle piece, i. (see Fig. 3) which adjusts a
lever, k (fixed on a spindle, 1) when the toothed bar rises or descends. On the same
spindle . is fixed a lever, e. connected with the rod, h, and thereby communicating
with the lever, h¹ which serves to shift the belt. A weight, r, tends to move the
lever, e, obliquely into the extreme positions determined by the notches in a disc, f.
To prevent shifting of the disc, f, a pawl, s, having a weight ", is provided which
falls into a notch corresponding to the position of the fork. The pawl, s, is released
by a stud, e', fixed on the lever, e, and which, when such lever is moved, depresses
the pawl s.
The pawl, s, serves to fix the belt on the loose pulley.
The operation of the improved pump is as follows: The belt actuates the pulley, I,
and, by the intermediate gearing, 9, P, o, n, and, m, (vide Figs. 6, and, 2) causes
the bar and the piston, B, to be raised. This movement also raises the lever, i,
(vide Fig. 3), which, by the lever arm, k, partly rotates the shaft, 1, and consequently
causes the lever arm, e, to gradually assume a vertical position. As such lever arm e
assumes such position, its extension, e¹, overrides and releases the pawl, s; and as it
passes the vertical position its weight, r, causes it to complete its movement on
the side towards which it was moving, and, by the rods, h, h¹, causes it to effect
the shifting of the belt to the pulley III. This pulley, thereupon, through the
gearing g', p, o", o¹, n¹, and, m, (vide Figs. 2, and, 5) causes the return movement of
the piston. By using the arrangements of gearing shown in Figs. 5, and, 6, the
plunger is caused to receive a rapid up stroke and a slow down stroke, but by using

page_text: the gearing shown in Fig. 7, instead of the gearing shown in Fig. 5, the plunger may
be caused to receive a rapid down stroke.
In the stuffing box shown in Fig. 9, the cap, A', screws onto the seating, B¹, and
presses the ring, C¹, onto the packing material located in the recess, D¹.
Having now particularly described and ascertained the nature of the said Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
1. A boiler pump for supplying heated feed water of 80 to 100° C. to boilers under
high pressure, the pump having two suction valves and two pressure valves and
receiving up and down movements by the employment of two sets of wheel gearing.
2. In a pump such as characterised in claim I. the arrangement for shifting the
fork, h, wherein by the movement of the bar, g, the displacement of the parts, i, k, l,
and e, is caused to take place, the weight r tending to move the lever, e, into the end
position determined by notches in the disc, f.
3. In the pump characterized by Claim I. the arrangement by which the pawl, s,
fixes the fork, h, in its end position, the release being effected by depression of the
pin, el.
Dated this 1st day of March 1890.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicant.