IMPROVEMENTS IN ROTARY PUMPS
Year: 1865

page_text: PROVISIONAL SPECIFICATION left by Charles Denton Abel, at the
Office of the Commissioners of Patents, with his Petition, on the 20th
October 1865.-A communication from abroad by Eduard Roesch,
residing at Lindenau, in the Kingdom of Saxony.
I, CHARLES DENTON ABEL, of No. 20, Southampton Buildings, Chancery
Lane, in the County of Middlesex, Patent Agent, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN ROTARY PUMPS," to be
as follows:-
This Invention consists in constructing rotary pumps of a disc mounted on
a spindle, and made to revolve inside a cylindrical casing, which disc fits
with its flat sides against the flat sides of the casing, and is made at one point
or at two opposite points of its periphery to come in contact with the inner
circumference of such casing by means of suitable metallic or other packing,
whilst between the other part of its periphery and the circumference of the
casing there exists a considerable space, in which the fluid is conveyed from
the suction pipe to the delivery pipe. A metal slide fitting closely against
the sides of the casing and passing through a slit in the same rests with its
edge upon the periphery of the rotating disc, being thus made to divide the
space existing between the periphery of the disc and the circumference of the
casing into two parts, with one of which the suction pipe communicates,
whilst the delivery pipe communicates with the other. The slide is capable
of moving backwards and forwards through the slit in the casing, which slit is
covered externally by a water-tight box or compartment formed on or fixed to
the casing, and in this compartment is a lever, to the one end of which the

page_text: before-mentioned slide is connected. The other end of the lever is fixed to a
spindle passing through a stuffing box.in the side of the compartment, and
carrying externally one or more other levers, the end or ends of which is or
are actuated by one or more cams fixed upon and revolving with the spindle
of the pump disc. The periphery of this cam or these cams is or are so
formed that by their rotation they impart such motion to the external lever or
levers, and consequently also to the lever inside the box on the casing, that
the before-mentioned slide is thereby made to advance and recede through the
slit in the casing in exact conformity and in close contact with the periphery
of the pump disc, according as the latter in revolving recedes from and
advances towards the circumference of the casing. The apertures in the
casing communicating with the suction and delivery pipes are situated quite
close together, one on each side of the slide, so that as the part of the peri-
phery of the pump disc which is in contact with the casing passes the delivery
aperture and the slide it also immediately passes the suction aperture, and
the fluid from the latter consequently at once begins to fill the enclosed space
formed between the slide and the projection on the pump disc, whilst at the
same time such projection drives the fluid in the space in front of it to the
delivery aperture on the other side of the slide.
The position of the before-mentioned external levers may, by means of set
screws, be made adjustable relative to the lever of the slide, so as to allow for
any wear through friction of the edge of the slide upon the periphery of the
pump disc. The before-mentioned cam or cams is or are however by pre-
ference so formed as to cause the slide to follow the periphery of the pump
disc closely, without at all pressing upon it, whereby such friction will be
reduced to a minimum and even practically obviated altogether.