Improvements in Subaqueous Dredgers.
Year: 1895

page_text: Date of Application, 15th Mar., 1895
Complete Specification Left, 26th July, 1895-4ccepted, 31st Aug., 1895
.
Improvements in Subaqueous Dredgers.
I, ANTHONY GEORGE LYSTER of Coburg Dock, Liverpool, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
The invention relates to dredgers in which the silt or material to be removed is
carried up by the flow of water through a pipe or tube, and the objects are to
provide the said pipe or tube with improved means for cutting or disturbing and
breaking up the silt or material to be dredged so that it may readily flow with
the water up the said pipe or tube. Usually the water is drawn up the pipe or
tube by suction..
Apparatus under my invention has a pipe or tube hinged in the usual way to a
pump or apparatus for causing water to How up the pipe on any suitable vessell or
structure, the lower end of the said pipe or tube opens into one end of a hollow
drum free to rotate on an axis at right angles to the longitudinal axis of the said
pipe or tube. The said hollow drum is provided on its periphery with scoops or
blades with openings leading therefrom. into the interior of the said hollow drum
Motion is given to the hollow drum by means of a hydraulic motor connected
therewith, power being led to the said motor from the vessel on structure through
pipes. Instead of fixing the motor at the lower end of the pipe or tube, power
may be conveyed to the said drum from the vessel or structure by means of
gearing.
Blades are secured to a fixed shaft passing through the drum and to the interior
of the drum for breaking up the material being dredged. Suction apertures are
made in the end of the drum when necessary.
J. JOHNSON.
Agent.i
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I ANTHONY GEORGE LYSTER of Coburg Dock, Liverpool in the County of
Lancaster, Engineer, 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 invention relates to dredgers in which the silt or material to be removed ise
carried up by the flow of water through a pipe or tube, and the objects are to
provide the said pipe or tube with improved means for cutting or disturbing and
breaking up the silt or material to be dredged. so that it may readily flow with the
water up the said pipe or tube. Usually the water is drawn up the pipe or tube
by suction.
Apparatus under my invention has a pipe or tube hinged in the usual way to a
pump or apparatus for causing water to flow up the pipe on any suitable vessel or
structure, the lower end of the said pipe or tube opens into one end of a hollow
drum free to rotate on an axis at right angles to the longitudinal axis of the said

page_text: pipe or tube. The said hollow drum is provided on its periphery with scoops or
blades of any suitable shape with openings leading therefrom into the interior of
the said hollow drum. Motion is given to the hollow drum by means of a
hydraulic motor connected therewith, power being led to the said motor from the
vessel or structure through pipes. Instead of fixing the motor at the lower end of
the pipe or tube, power may be conveyed to the said drum from the vessel or
structure by means of gearing.
Blades are secured to a fixed shaft passing through the drum and to the interior
of the drum for breaking up the material being dredged. Suction apertures are
made in the end of the drum when necessary.
DESCRIPTION OF THE DRAWINGS..
Figs. 1 and 2 are elevations at right angles to each other of dredgers constructed
in accordance with my invention. a is a suction pipe or tube hinged at 6 in any
usual way to the pump suction pipes c.
d pumps. e motors. The motors and
pumps are carried on the dredging barge, vessel, or structure. f, is a frame or
stretcher carrying at its lower end an axle g, one end of which is fixed to the
frame whilst the other end is secured to the suction pipe a affixed to the frame f
gare blades on the axle 9. Free to rotate around the axle g is a hollow drum h
provided with trunnions i, ¹. The trunnion i turns in a bearing on the frame f
and opens into the suction pipe a, whilst the trunnion fits close on the axle g.
The drum his provided on its periphery with scoops or blades; having openingsk
leading into the interior of the said hollow drum h. are toothed wheels attached
to the trunnions i i. The said wheels gear with wheels m on a shaft m' which
wheels m gear with pinions n on a shaft n¹. On the shaft n' is a toothed wheel
which gears with pinions pp', on crank shafts q, 9. r, r', are twin single-acting
hydraulic motors coupled in pairs to cranks at right angles on the shafts q, 9.
8, s, power-supply pipes.
l
It will be obvious that the construction of the motors and gearing may be varied
without departing from my invention.
The
Fig. 3 is an elevation showing a modification of driving-gear. In this case the
trunnion has a worm wheel on it which gears with a worm t on a shaft u.
said shaft u is led in bearings along the frame f to the deck or other convenient
place where power is applied.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
First. In sub-aqueous dredgers, the combination of a pipe or tube hinged to a
pump or apparatus for causing water to flow up the said pipe or tube with a hollow
drum rotated on an axis at right angles to the longitudinal axis of the said pipe or
tube, the said hollow drum having scoops or blades of any suitable shape on its
periphery and openings therefrom into the interior of the said hollow drum.
Second. In sub-aqueous dredgers, the combination of a pipe or tube hinged to a
pump or apparatus for causing water to flow up the said pipe or tube, with a hollow
drum rotated on an axis at right angles to the longitudinal axis of the said pipe or
tube, the said hollow drum having scoops or blades of any suitable shape on its
periphery and openings therefrom into the interior of the said hollow drum, and a
fixed shaft passing through the said hollow drum and having blades secured thereto.
Third. Sub-aqueous dredgers constructed and operating substantially as herein
.set forth.
Dated the 25th day of July 1895