Improvements in Sand-pump Dredging Apparatus.
Year: 1891

page_text: Date of Application, 17th June, 1891
Complete Specification Left. 12th Mar., 1892-Accepted, 16th Apr., 1892'
PROVISIONAL SPECIFICATION.
Improvements in Sand-pump Dredging Apparatus.
I, HENRY CHRISTIAN LOBNITZ, of Renfrew, in the County of Renfrew, North
Britain, Engineer and Shipbuilder, do hereby declare the nature of this invention
to be as follows, that is to say :-
My said invention has for its object to improve and simplify the construction of
sand-pump dredging machinery.
In carrying out my invention in the case of a dredger in connection with which
the suction pipe extends up to and over the side of the vessel and thence down to
or into the centrifugal pump situated at the lower part thereof or on the deck I
arrange for the elevation and inboard stowing of the outer or outboard part of the
suction pipe by means of a single or double joint or movable connection between the
outboard and inboard portions of the pipe. I have the outboard part of the pipe
fixed at its upper end to an angled part extending horizontally inwards and having
its inner end inserted through a stuffing box into a top horizontal part of the
inboard pipe which extends down to the pump. The outboard pipe and its top
angled piece are carried in trunnion bearings in a cradle or slide which can be
moved inwards and outwards on guides; and when it is wished to stow the
outboard pipe its outer length is turned up by means of any suitable hoisting
apparatus, and when high enough it is moved inboard with its cradle, the right-
angle piece then entering further in through the stuffing box into the inboard pipe.
The cradle or slide carrying the outboard pipe may when in its outermost position
have its outer part supported on brackets or sponsons permanently fixed to the side
of the dredger, or the cradle or slide may be so constructed and so held as to
overhang when in its outermost position, so that when the outboard pipe and its
cradle or slide are stowed inboard no part will project beyond the dredger's side.
According to another modification, I have the outboard suction pipe, when in
operation, in direct communication with the pump through the lower part of the
dredger's side; and I have it also arranged to be stowed inboard on deck when not
in operation. The inboard suction pipe extends directly from the pump to the
dredger's side, being fitted with a suitable valve or stopcock for closing it when not
in operation. The outboard suction pipe is made with a bend at its upper or inner
part and has there fitted to it, with a joint allowing the pipe to be placed
at any angle, a slide arranged to move in guides up and down the outside of the
dredger. In the lowest position of the slide it holds the upper end of the outboard
suction pipe so as to communicate through the dredger's side with the inboard
suction pipe. When the outboard suction pipe is to be stowed it is raised with its
slide, and being turned into a horizontal position, is then moved inboard, the
vertically moving slide engaging with a horizontally moving slide or cradle at the
top, and moving inboard therewith.
The pump may be driven by a special engine, or through suitable gearing, with.
an engaging clutch, from the main engines of the dredger."
Dated this Sixteenth day of June 1891.
EDMUND HUNT,
Applicant's Agent.

page_text: COMPLETE SPECIFICATION:
Improvements in Sand-pump Dredging Apparatus.
I, HENRY CHRISTIAN LOBNITZ, of Renfrew, in the County of Renfrew, North
Britain, Engineer and Shipbuilder 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, that is to say :-
My said invention has for its object to improve and simplify the construction of
sand-pump dredging machinery.
in
In carrying out my invention I arrange for the elevation and inboard stowing of
the outboard suction pipe, whether such pipe when in operation extends up to and
over the side of the vessel or is arranged for connection through the side of the
vessel with an inboard suction pipe. A separate engine may be provided for
driving the sand pump or pumps, or they may be driven directly or indirectly from
the main propelling engines of the dredging vessel, suitable engaging and dis-
I prefer to arrange two pumps
engaging gear being provided in the latter case.
cach dredging vessel both discharging into the same pipe, such pipe having a
receiver provided on each side to aid in separating sand or mud from the water.
In further describing and explaining my improvements I shall refer to explanatory
diagrams on an accompanying sheet of drawings. Figure, 1, is a plan and Figure, 2,
is a side elevation of a dredger; and Figures 3, and 4, are enlarged transverse vertical
sections showing different modifications of parts of the apparatus. In these
drawings the same reference letters are used to mark the same or like parts
wherever they are repeated.
In the case of a dredger in connection with which, as shown in Figure, 3, the
suction pipe, A, B, extends up to and over the side of the vessel and thence down
to the centrifugal pump, C, situated at the lower part thereof, I arrange for the
elevation and inboard stowing of the outer or outboard part, A, of the suction pipe,
by means of a single or double joint or movable connection between the outboard
and inboard portions, A, and B, of the pipe. I have the outboard pipe, A, fixed at
its upper end to, or formed with an angled part, D, extending horizontally inwards
and having its inner end inserted through a stuffing box, E, into a top horizontal
part of the inboard pipe, B, which extends down to the pump, C. The outboard
pipe, A, and its top angled piece, D, are carried in trunnion bearings in a cradle or
slide, F, which can be moved inwards and outwards on guides; and when it is
wished to stow the outboard pipe, A, its outer length is turned up by means of any
suitable hoisting apparatus; and when high enough, it is moved inboard with its
cradle, F, the angled piece, D, then entering further in through the stuffing box, E
into the inboard pipe, B. The outboard pipe, A, is shown in its operating position
at the right-hand side of Figure, 3, and as stowed on deck at the left hand side o
that figure. The cradle or slide, F, which carries the outboard pipe, A, may whe
in its outer position have its outer part supported on brackets or sponson
permanently fixed to the side of the dredger; or the cradle or slide, F, may
constructed as indicated in Figure, 3, and be held so as to overhang when in it
outermost position, so that when the outboard pipe, A, and its cradle or slide,
are stowed inboard no part will project beyond the dredger's side.
According to another modification shown in Figures 1, 2, and 4, I have th
outboard suction pipe, A. when in operation, in direct communication with th
pump, C, through the lower part of the dredger's side; and I have it also arrange
to be stowed inboard on deck when not in operation. An inboard suction pipe,
extends directly from the pump, C, to the dredger's side, being fitted with a val
or stopcock, H, for closing it when not in operation. The outboard suction pipe, A
is made with a bend, J, at its upper or inner part, and has there fitted to it, with
joint allowing the pipe, A, to be placed at any angle, a flange, K, fitted as a slide
move in guides, L, up and down the outside of the dredger. In the lowest positi

page_text: of the slide, K, it holds the upper end of the outboard pipe, A, so as to communicate
through the dredger's side with the inboard suction pipe, G. When the outboard
suction pipe, A, is to be stowed it is raised with its slide, K, and being turned into
a horizontal position, is then moved inboard, the vertically moving slide, K,
engaging with a horizontally moving slide or cradle, M, at the top and moving
inboard therewith. The parts are shown in different positions at the opposite sides
of Figure, 4, and also in Figures, 1, and 2.
The drawings show the dredger as fitted with apparatus for employing suction
pipes at both sides of the vessel, there being two centrifugal pumps, C, each with
its inboard suction pipe, B or G. A single upward delivery pipe, N, is provided
for the two pumps, C, and is fitted with a valve, P, indicated by dotted lines in
Figure, 4, for closing the communication with either pump when it is not operating..
At the upper part of the vertical delivery pipe, N, there are provided for settling
mixtures of sand or mud and water two receivers or troughs, Q, one on each side,
the discharge openings into which, from the vertical pipe, N, can be adjusted by
slides or hinged doors in a manner to discharge in separate streams, water containing
little or no sand or mud, or sand or mud with little water.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. In sand-pump dredging apparatus, constructing, arranging, and connecting the
outboard suction pipe substantially in any of the modes hereinbefore described so
that it can be stowed on the deck of the dredger.
2. In sand-pump dredging apparatus providing pipes having suitable internal
stop valves and constructed for sucking through the side of the dredger sub-
stantially as hereinbefore described.
3. In sand-pump dredging apparatus arranged for sucking through the side of the
dredger providing an outboard suction pipe capable of being disconnected from the
sucking apparatus, and of being raised and stowed on deck, substantially as
hereinbefore described.
4. In combination with the improved suction details, the connecting of two
centrifugal sand pumps to one delivery pipe substantially as and for the purposes
hereinbefore described.
5. Arranging the sand-pumps with engaging and disengaging gear in connection.
with the propelling engines of the dredger as hereinbefore described.
Dated this Eleventh day of March 1802
EDMUND HUNT,
Applicant's Agent.