Double-acting Pump without Stuffing-box Worked by Hand.
Year: 1894

page_text: Date of Application, 5th Feb., 1894-Accepted, 12th May, 1894
Double-acting Pump without Stuffing-box Worked by Hand.
I, MATHIAS HERPERS, Architect, of Dorsten, in the Province of Westphalia,
Prussia, 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 double-acting pump represented in annexed drawing, which is also intended
to be used as a fire-engine, is principally meant to introduce the advantages of the
double-acting pump into household use." For this reason and especially in order to
allow of its being used as a fire-engine it is of light build and very portable and
arranged for being worked by hand.
The annexed drawing gives in
Fig. 1. the sketch of such a pump, half in a front-view and half in section;
Fig. 2. is a horizontal section through the pump along X-Y;
Fig. 3 a vertical section along V-W;
Fig. 4 shews in a side-view the piece that serves as a bed for the lever H
actuating the piston; and
Figs. 5 & 6 shew the piston in its two final positions; in
Fig. 7. the arrangement of a valve is given, and in
Fig. 8. a modification of the stroke of the piston.
In general the arrangement of the pump is the same as in ordinary double-
acting pumps. At S (Figs. 1 & 2) the suction-pipe is attached and according to
the direction of the motion of the piston the water enters on the right or the left
side by the lower open valve, the valve above closed, while on the other side the
water is forced through the open upper valve into the chamber which is in connexion
with the forcing-pipe, the lower valve being closed. By these means
uninterrupted delivery of water is obtained and the inventor of the hand-pump that
is here described, has succeeded by an arrangement of double-acting pumps worked
by hand in utilizing this advantage for household purposes.
an
As in most double-acting pumps the piston consists of two pistons connected
with each other. In the present construction however the connecting-rod having a
square section is not solid throughout, but in its centre there is a gap in which a
piece a, provided with two lateral pins is moveably inserted. This piece has
besides a vertical perforation d into which fits a pin passing vertically downwards
from the centre of the axis H.
The axis H lies in bearings on each side of the pump, as is specially shewn in
Fig. 4. These bearings are connected with the pump by a screws passing
through it. The two ends of the axis H are square, and on them are mounted
the levers or rails K. These levers pass the pump laterally or go upwards as
handles.
The pump is worked in the following manner. By means of the backward and
forward motion of the hand-lever fixed to the square end of the axis H, the axis
is made to rotate alternately to the right and to the left imparting thereby an
oscillatory motion to the vertical pin which is in connexion with it and catches into
the revolving piece a; by this motion the piston is alternately pushed backwards
and forwards and the pump made to work.
Instead of the vertical pin catching into a, toothed-wheel gear may also be
employed, as drawn in Fig. 8. This is done by the connecting-rod between the
two pistons being formed as a rack at its upper end, and by placing on the axis H
an outwardly toothed segment of a circle (Fig. 8), which gears together with the
Lai Q77

page_text: rack. In this case an oscillatory motion is imparted to the levers in the same
manner and the piston works exactly as in the first arrangement.
A special advantage of this piston-construction lies in the fact that the pump
works without any stuffing-box, as the double-piston moves in one and the same
cylinder. It will be at once apparent to every technically educated person what
drawbacks are avoided by doing away with any kind of stuffing-box in a pump; it
It must
is only necessary to think of the packing and the work connected with it.
furthermore be observed that the pump in consequence of its new piston- and
valve-construction or position works almost without clearance by which means a
great efficiency of suction is attained.
In order to allow of the valves being taken out more easily for the purpose of
grinding and polishing their surfaces, the inventor has not used screws for attaching
the valve-flaps in the valve-box, but he has placed the back-ends of the flaps
between flat metal pieces n n₁ and riveted them together. The lower metal-piece n₁
is now placed in a groove that is cut in the body of the pump and then the cover,
in which there is a hollow for the reception of n n₁, is pushed up. The upper side
of this hollow now acts as a wedge against the upper side of the metal piece n,
thus firmly wedging in the valve-flap (Fig. 7). As soon as the cover is removed
the valve-flaps may also easily be taken out.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is:
1. Double-acting pump to be worked by hand without any stuffing-box whatever,
in which the alternate rotation to the right and left of an axis, caused by the
oscillatory motion of hand-levers, is used to push the piston backwards and
forwards.
2. In the pump distinguished in Claim 1 the fastening of the flap-valves by the
cover of the valve-chamber which is provided with a projection wedging in the
flap-valves at one end.
Dated this 25th day of January 1894.
For MATHIAS HERPERS,
B. Brockhues.