Improvements in Dredging Apparatus.
Year: 1893

page_text: Date of Application, 18th Nov., 1893
Complete Specification Left, 20th Aug. 1894-Accepted, 29th Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Dredging Apparatus.
I, JOHN GWYNNE of Hammersmith Iron Works, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention to be as follows :-
This invention has reference to improvements in dredging apparatus of the
kind in which material such as silt, mud, sand and gravel, is raised by means of a
current of water passing upward through a suction pipe connected to a centrifugal
pump or the like.
According thereto I so construct the mouth-piece of the suction pipe that the
said pipe and mouth-piece shall be capable of movement relatively to each other
for the purpose of enabling the mouth-piece to at all times take a proper bearing on
the material to be dredged notwithstanding any variation that may take place
from time to time in the angular position of the suction pipe with regard to the
surface of the said material, due for instance to the rising and falling movement
of the vessel with which the apparatus is used, in consequence of tidal action.
As will be obvious suction pipes and mouth pieces as described can be constructed
in various forms.
According to one arrangement the mouth-piece comprising a tubular piece
formed with a serrated lower edge and having a grid or grating as usual, is
provided with a lug or bracket by which it is hinged to a corresponding lug or
bracket secured to the suction pipe. The lower end of the suction pipe is bent to a
circular form having the pivot connecting it to the mouth-piece as a centre, and
the upper end of the mouth-piece is similarly bent, these end portions being fitted
telescopically one within the other, and so arranged relatively to each other that
either the suction pipe or the mouth-piece can turn independently of the other about
the above mentioned pivot as a centre.
A suitable stop may be provided to limit this turning movement to the required
extent.
This 17th day of November 1802
COMPLETE SPECIFICATION.
Improvements in Dredging Apparatus.
I, JOHN GWYNNE, of Hammersmith Iron Works, in the County of Middlesex,
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 :-
o
This invention has reference to improvements in dredging apparatus of the kind
in which material such as silt, mud, sand and gravel, is raised by means of a current
of water passing upward through a suction pipe connected to a centrifugal pump or
the like.
According thereto I so construct the mouth-piece of the suction pipe that the
said pipe and mouth-piece shall be capable of movement relatively to each other
for the purpose of enabling the mouth-piece to at all times take a proper bearing
on the material to be dredged notwithstanding any variation that may take place
from time to time in the angular position of the suction pipe with regard to tho
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page_text: surface of the said material, due for instance to the rising and falling movement
of the vessel with which the apparatus is used, in consequence of tidal action.
As will be obvious suction pipes and mouth-pieces as described can be constructed
in various forms.
In the accompanying drawings
Figs. 1 and 2 are respectively a vertical section and plan of one arrangement of
mouth-piece according to this invention. It comprises a tubular piece 1 that is
formed with a serrated lower edge 2 and has a grid or grating 3 as usual, and is
provided with a lug or bracket 4 by means of which and a pivot 5 it is hinged to
a corresponding lug or bracket 6 secured to the suction pipe 7. The lower end
of the suction pipe, which is also serrated as shewn, is bent to a circular form
having the pivot 5 as a centre, and the upper part of the mouth-piece is similarly
bent, these end portions being fitted telescopically one within the other, and so
arranged relatively to each other that either the suction pipe or the mouth-piece
can turn independently of the other about the above mentioned pivot as a centre.
8, 8" are stops fixed respectively upon the interior of the tubular piece 1 and upon
the suction pipe 7 for the purpose of limiting this turning movement to the required
extent.
9 is a guide rib carried by the curved portion of the suction pipe and arranged
to work against a grooved guide roller 10 mounted on a pin 10* fixed to the
mouth-piece.
The lower serrated edge of the tubular piece 1 is preferably inclined as shewn
in Fig. 1.
When the material to be dredged is in the form of a more or less compact mass I
provide such a mouth-piece with means whereby a jet or jets of water under pressure
can be caused to issue as described in the Specification of Letters Patent granted
to me dated 13 December, 1892, No. 22913.
Such an arrangement is illustrated in Figs. 3 and 4 which are similar views to
Figs. 1 and 2 respectively. 11 is a metal tube bent to annular form and adapted
to closely encircle the lower portion of the mouth-piece to which it is secured by
means of screw bolts 11. The end 11 of the tube 11 is connected by a flexible
pipe to a force pump by which water under considerable pressure can be forced
into the said tube, the other end of which is plugged; the under side of the tube is
slit as shown so that the water can issue therefrom in an annular jet so as to break
up or loosen the material directly under the mouth-piece.
In this arrangement the stops for limiting the movement of the parts 1 and 7 are
secured within the upper and fower edges of the said parts as shewn at 12, 12" and
the guide roller 10 is mounted in a box or casing 10° fixed to the mouth-piece.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In dredging apparatus, a suction pipe provided with a separate mouth-piece, said
suction pipe and mouth-piece being hinged or jointed together and arranged
telescopically one within the other substantially as described with reference to and
shewn in the accompanying drawings for the purpose specified.
Dated this 20th day of August 1894.
3333
COIS LOCH uay 01 August 1894.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.