Improvements in and relating to Centrifugal Pumps.
Year: 1890

page_text: Date of Application, 30th Aug., 1890
Complete Specification Left, 23rd June, 1891-Accepted, 25th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in and relating to Centrifugal Pumps.
I, JAMES NOAH PAXMAN, of the Standard Iron Works, Colchester, in the
County of Essex, Engineer, do hereby declare the nature of my said invention
(which has been communicated to me from abroad by James Welman, of Hokitika,
in New Zealand, Engineer) to be as follows:--
My invention relates to improvements in centrifugal pumps used for the purpose
of dredging sand, shingle, and like substances, and it has for its object the prevention
of fracture of the pump casing, the prevention of wear of the stuffing boxes, glands,
and shaft, and also facilitating the removal of those parts subject to wear.
I attain these ends in the following manner; line the interior of the pump
case and suction box-which may be of any suitable metal and of any convenient
or desired size or shape-with wrought iron or steel linings. These linings are
made in sections or pieces of a convenient size, and are fixed to the casing of the
punp by countersunk bolts and nuts, or by studs or screws tapped into the lining
plates, or by any other suitable means. I sometimes place rubber or any other
suitable non-metallic substance between the lining and the casing to cushion or
distribute the force of any blow which the lining plate or plates may receive from
the substance being dredged.
The cut-off, or discharge, block is made separate from the pump casing and is
attached thereto by suitable bolts, or by being dovetailed into the casing and
secured by suitable wedges or keys, thereby permitting it to be readily removed
and renewed when worn.
To prevent the ingress of gritty matter into the stuffing boxes, they are formed
with annular spaces through which water is forced by a pressure pump or otherwise,
thus making a stream encircling the shaft.
Dated him on t A 1900
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
Royal Courts Chambers, 70-72, Chancery Lane, London, W.C.,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Centrifugal Pumps.
[JAMES_NOAH PAXMAN of the Standard Iron Works Colchester, in the
County of Essex, Engineer, do hereby declare the nature of my said invention
(which has been communicated to me from abroad by James Welman of Hokitika
in New Zealand Engineer) and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement :-
My invention relates to improvements in centrifugal pumps used for the
of dredging sand, shingle, and like substances, and it has for its object the
prevention of fracture of the pump casing, the prevention of wear of the stuffing
boxes, glands, and shaft, and also facilitating the renewal of those parts subject to
wear.
purpose
I attain these ends in the manner illustrated by the accompanying drawing in

page_text: Throughout these views similar parts are marked with like letters of reference.
I line the interior of the pump case A which may be made of any suitable metal
and of any convenient or desired size or shape according to the purpose for which
it is intended, with wrought iron or steel lining plates B. These lining plates are
made in sections or pieces of a convenient size and are fixed to the casing of the
pump by countersunk bolts h, b. ite, and nuts 1ª l' etc., or by studs or serews tapped
into the lining plates, or by any other suitable means. 1 sometimes place sheets C
of rubber or any other suitable non-metallic substance between the lining plates B
and the casing A, to cushion or distribute the force of any blow which the lining B
may receive from the spoil being dredged. The suction box D and also the sides
of the casing A of the pump may also be lined with plates B' attached and fixed in
such a manner that they can readily and easily be renewed when worn.
The cut-off or discharge block E is made separate from the pump casing A so
that it can be renewed when worn, and it is attached thereto by suitable bolts (.
and is preferably dovetailed into the said easing as shown by the accompanying
drawing. Instead of using bolts for fixing the cut-off or discharge block, wedges
or keys may be used.
To prevent the ingress of gritty matter into the stuffing boxes F they are formed
with annular spaces between the ends of the bushes and the stuffing box F,
into which water is forced by a pressure pump or otherwise, through pipes the
water passing through channels in a stream encircling the shaft H thus preventing
the entry to the stuffing box Isles of any gritty matter.
I wish it to be particularly understood that I do not limit myself to the precise
details of construction herein-above set forth and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that what I
claim is
1st. In a centrifugal pump, lining the interior of the pump case with steel or
other suitable metal, as and for the purpose set forth.
2nd. In a centrifugal pump, lining the inside of the pump case and the suction
box with plates of steel, or other suitable metal, as and for the purpose set forth.
3rd. In a centrifugal pump, lining the interior of the pump case with steel or
other suitable metal with a non-metallic backing or cushion of india-rubber or other
suitable non-metallic substance between the lining plates and the pump case, as and
for the purpose set forth.
4th. In a centrifugal pump, lining the inside of the pump case and the suction
box with plates of steel or other suitable metal, and interposing between the said
lining plates and the inside of the pump case and suction box, a layer or cushion of
indin rubber or other suitable non-metallic substance, as and for the purpose set
forth.
5th. In a centrifugal pump, the separate and renewable cut-off' block, as and for
the purpose set forth.
6th. In a centrifugal pump, constructing the stuffing boxes with annular spaces
round the axle or shaft through which water is forced, as and for the purpose set
forth.
7th. In a centrifugal pump, the combination with the pump case, of the steel or
other suitable metal lining, and of the separate and renewable cut-off' block, as set
forth.
8th. In a centrifugal pump, the combination with the pump case, of the steel or
other suitable metal lining, of the india-rubber or other suitable non-metallic
backing or cushion, and of the separate and renewable cut-off' block, as set forth.
9th. In a centrifugal pump, the combination with the pump case, of the steel or
other suitable metal lining, of the separate and renewable cut-off block, and of the
particular construction of stuffing boxes, as set forth.

page_text: 10th. In a centrifugal pump, the combination with the pump case, of the steel or
other metal lining, of the india-rubber or other suitable non-metallic backing or
cushion, of the separate and renewable cut-off block, and of the particular con-
struction of stuffing boxes, as set forth.
Dated this 23rd day of June 1891.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.