IMPROVEMENTS IN CENTRIFUGAL OR OTHER PUMPS
Year: 1878

page_text: LETTERS PATENT to John Gwynne, of Hammersmith, in the County of
Middlesex, Engineer, for the Invention of "IMPROVEMENTS IN CENTRIFUGAL
OR OTHER PUMPS."
Sealed the 16th May 1879, and dated the 18th November 1878.
PROVISIONAL SPECIFICATION left by the said John Gwynne at the Office
of the Commissioners of Patents on the 18th November 1878.
"IM-
JOHN GWYNNE, of Hammersmith, in the County of Middlesex, Engineer.
PROVEMENTS IN CENTRIFUGAL OR OTHER PUMPS."
My Invention relates principally to improvements on the casings of centrifugal
pumps in which the suction pipe and pump casing are in one casting, and consists
in forming the casing on one (or both) of its sides with an aperture sufficiently
large to admit of inserting the pump disc on to its spindle through the said aperture,
which is then covered or filled up by a removable piece secured to the side of the
casing by specially constructed lugs or ears hereafter described, or by any other
effectual means, so as to form an uniform and entire casing as if all cast in
one piece.
The special ears or lugs for securing the removable piece project from the latter,
and engage with corresponding lugs on the pump casing, the respective lugs being
so shaped that on fitting the removable piece into its place they interlock, and the
removable piece is thereby drawn closely to the casing so as to form a perfectly
tight joint therewith.
By this arrangement the pump disc can be taken out and replaced without
disturbing the suction or discharge pipes.
The above method of securing the removable piece to the casing is applicable to
any form of centrifugal or other pumps; also for joining the suction and discharge
pipes thereto, and for joining one or more lengths of such piping together.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Gwynne in the Great Seal Patent Office on the 17th May
1879.
JOHN GWYNNE, of Hammersmith, in the County of Middlesex, Engineer. "IM-
PROVEMENTS IN CENTRIFUGAL OR OTHER PUMPS."
My Invention for improvements in centrifugal or other pumps relates pricipally
to improvements on the casings of centrifugal pumps in which the suction pipe and
pump casing are in one casting, and consists in forming the casing on one or both
of its sides with an aperture sufficiently large to admit of inserting the pump disc
on to its spindle through the said aperture, which is then covered or filled up by a
removable piece secured to the side of the casing by specially constructed lugs or
ears hereafter described, or by any other effectual means, so as to form an uniform
and entire casing as if all cast in one piece.
The special ears or lugs for securing the removable piece project from the latter
and engage with corresponding lugs on the pump casing, the respective lugs being
so shaped that on fitting the removable piece into its place they interlock, and the
removable piece is thereby drawn closely to the casing, so as to form a perfectly
tight joint therewith.
By this arrangement the pump disc can be taken out and replaced without
disturbing the suction or discharge pipes.
The above method of securing the removable piece to the casing is applicable to
any form of centrifugal or other pumps; also for joining the suction and discharge
pipes thereto, and for joining one or more lengths of such piping together.
And in order that my said Invention may be well understood I shall now proceed
more particularly to describe the same, reference being made to the accompanying
Drawing, like letters of reference indicating corresponding parts in all Figures.
Figure 1 is a central side sectional elevation of a centrifugal pump, and its appen-
dages constructed and mounted according to the said Invention; Figure 2, a section
on line 1, 2, in Figure 1; and Figure 3, a front elevation at the left hand or pump
end of Figure 1.
The front side of the casing of the centrifugal pump A (see Figures 1 and 3 is
formed with an opening sufficiently large to admit of inserting the pump disc on to
its spindle F through the said opening, which is afterwards closed or filled up by a
removable piece or cover T secured to the casing, so as to form an uniforin
continuation thereof as if all cast in one piece.
The removable piece or cover T when fitted to its place over the opening in the
pump casing closes to the latter in a recessed flanged joint c, whilst its suction
joint d with the suction chamber of the casing may be either made at an angle as
shewn, or at an angle struck from its front edge upwards towards the casing, or the
joint d may be arranged in any other desirable manner.
From the circumference of the removable piece or cover T project the lugs or
ears U, U, formed with inclined or bevelled faces for engaging with correspondingly
shaped lugs or catches U', U¹, on the pump casing.
In a slotted socket V projecting from the casing adjacent to the removable piece
or cover T is placed a cylindrical nut V, through which works a screwed bolt or
rod W terminating at its lower end in a ball X, which is confined by but freely
adjustable every way in a slotted socket X' cast on or attached to the face of the
removable piece or cover T¹ as shewn.
The mode of securing the removable piece or cover T against the pump casing so
as to form a perfectly tight joint therewith by the arrangement here described is as
follows:-
:-
The removable piece or cover T being placed in such a position over the opening
in the casing that its lug or ears U, U, are disengaged from or clear of the
corresponding lugs or catches U¹, U, and that its suction joint d is broken or

page_text: separated, the cylindrical nut U₁ and ball X on their screwed bolt or rod W are
placed respectively in the slotted sockets V and X', and the screwed bolt or
rod W being then turned round in its nut V1 causes the removable piece or cover T
to be radially shifted or turned round in the opening of the casing, and in so
doing its lugs or ears U, U, engage or interlock with the corresponding lugs or
catches U¹, U¹, their inclined or bevilled faces being wedged against those of the
lugs or catches U¹, U¹, so as to press the removable piece or cover T tightly against
the pump casing, at the same time the suction pipe d is closed and tightened, and
the apparatus assumes the position seen in Figure 3.
By this arrangement the pump disc can be taken out and replaced without
disturbing the suction or discharge pipes.
If preferred the removable piece or cover T may be secured to the pump casing
by ordinary bolts or screws in lieu of the lugs described, or the joint may be
effected in any other manner found most suitable.
The above method of making the joint between the removable piece or cover T
and the pump casing by lugs or ears is also applicable to the joints of the suction
and discharge pipes with the pump, in which case the lugs or ears U, U, are
formed on the ends of the pipes, and engage with the lugs or catches U', U₁, on the
respective branches of the pump A, the screwed bolt or rod W and its appendages
being dispensed with, and the pipe turned round by means of studs or pins e pro-
jecting therefrom, as seen in Figure 1.
Figure 4, which is a section of the suction or discharge pipe on line 3, 4, in
Figure 1, shews the lugs or catches U¹, U¹, extending entirely round the suction
branch of the pump A, notches or spaces f, f, being left therein, through which the
lugs or ears of the pipe are inserted, and then, turned round under the catches on
india rubber or other packing placed between the ends of the pipe and suction
branch, being thereby compressed so as to form a perfectly tight joint.
The joints of the various lengths of suction and discharge pipe to the pump A
may be made in a similar manner.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider novel and original, and
therefore claim as the Invention secured to me by the hereinbefore in part recited
Letters Patent is,―
First. Forming the casing of a centrifugal pump on one or both of its sides with an
opening, closed by a removable piece or cover, substantially as and for the purpose
hereinbefore described, and illustrated by the accompanying Drawing.
Second. The method of securing the removable piece or cover to the casing of
a centrifugal pump, such method being also applicable to the joints of the suction
the
and discharge pipes, substantially as hereinbefore described and illustrated by
accompanying Drawing.
In witness whereof, I, the said John Gwynne, have hereunto set my hand
and seal, this Sixteenth day of May, in the year of our Lord One thousand
eight hundred and seventy nine.
JOHN GWYNNE. (L.S.)