Improvements in and relating to Dredging Apparatus.
Year: 1895

page_text: Date of Application, 5th Oct., 1995
Complete Specification Left, 4th July, 1896-Accepted, 15th Aug. 1896
PROVISIONAL SPECIFICATION.
Improvements in and relating to Dredging Apparatus.
I, JOHANNFS ADOLPH MENCK, of 138 Grosse Brunnenstrasse in the City of
Altona-Ottensen, in the Empire of Germany, Eugineer, do hereby declare the
nature of this invention to be as follows
of
This invention relates to improvements in dredging machines and it especially
refers to the device or mechanism for hoisting and operating tho dredging-scoop
such dredging machines, and it consists in arranging for the working chains of the
dredging-scoop two separate drums on the shaft of the power-winch, which'drums
are connected with each other by suitable means in such a manner that the said
diums are capable of being turned independently of each other in either direction
for an angle of about 300 degrees, in order to allow a differential motion of the
working chains whereby the dredging-scoop will be closed or opened respectively;
and it further consists in providing suitable means by which the said separate
drums may be coupled with each other when required.
The objects of the said improvements are, first, to provide a hoisting-device by
which the dredging-scoop may be operated in a simple and reliable manner and
by which sized opening-chains, grooved chain-nuts and special tackles commonly in
use for lifting the said opening-chains of the dredging scoop may be dispensed
with; and second, to provide means whereby the said hoisting-device is enabled to
open the dredging-scoop, when required, before its being lifted oi hoisted
To carry my invention into effect I provide on the main shaft of the power-winch
two separate chain-drums one of which is firmly keyed on the said shaft and
designed for winding on and off the lifting-chain of the dredging-scoop while the
other cham-drum is loosely fixed on the said shaft and designed for the opening-
cbain which serves to open the two shell-shaped and hinged parts of the dredging-
scoop. The two adjoining end-faces of the said chain-drums are furnished each
with a suitable shoulder or stop which projecting in the path of each other prevent
the loose chain dium from being turned freely on the winch-shaft. The loose
chain-dium may therefore be turned independently of the fixed ohain-drum in
either direction only for a distinct angle of about 300 degrees whereupon the said
chain-drums are coupled by their respective shoulders or stops engaging with each
other, so that the fixed chain-drum is made to drive the loose chain-drum in one ot
the other duection respectively Motion being imparted to the winch-shaft by
means of a suitable gearing the chain-diums may be provided with suitable
friction-brakes.
The independent rotation of the loose chain-drum with respect to the fixed
chain-dium or vice-versa causes a differential motion of the working-chains, that is
to say, of the opening-and of the lifting-chain, whereby the dredging-scoop will
be opened or closed accordingly, while by the co-operation of the said chain-drums
the dredging-scoop is lowered or raised.
The diameter of the chain-drums and the lengths of the working-obains thust be
chosen in such a proportion that the independent rotation of the said chain-drums
for an angle of about 300° 18 sufficient for securing the necessary differential'
motion between the working-chains required for the reliable closing or opening of
the dredging-sooon.

page_text: In certain cases, for stance when the diedging-scoop has taken a fast hold in
the ground, it is desirable and often necessary to open the shells of the dredging-
scoop and to lift the latter in this opened position For this purpose the said
chain-diums are furnished with a sintable coupling-device adapted to firmly
connect the chain-diums with each other in the position which corresponds to the
opened position of the dredging-scoop so that on winding on the working-chains
upon the coupled chain-drums the dredging-scoop is first opened by means of the
opening-chain and then lifted by the latter and the lifting-chain in the sand opened
position.
Dated this 5th day of October 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
improvements in and relating to Dredging Apparatus.
1, JOHANNES ADOLPH MENOK, of 138 Grosse Binnuenstrasse in the City of
Altona-Ottensen, in the Empire of Germany, Engineer, do hereby declare the
nature of this invention nud in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement.-
This invention relates to improvements in dredging machines and it especially
refers to the device or mechanism for hoisting and operating the dredging-scoop of
such dredging machines, and it consists in arranging for the working chains of the
dredging-scoop two separate drums on the shaft of the power-winch, which drums
are connected with each other by suitable meaus in such a manner that the said
drums are capable of being turned independently of each other in either direction
through an angle of about 300 degrees, in order to allow a differential motion of
the working chains whereby the dredging-scoop will be closed or opened respec-
tively and it further consists in providing suitable means by which the said
separate drums may be coupled with each other when required.
The objects of the said improvements are, first, to provide a hoisting-device by
which the dredging-scoop may be operated in a simple and reliable mauner and
by which opening chains of suitable size, grooved chain-nuts and special tackle
commonly in use for lifting the said opening-chains of the dredging-scoop may be
dispensed with, and second, to provide means whereby the said hoisting-device
18 enabled to open the diedging-scoop, when required, before its being lifted or
hoisted.
In order that my invention may be more fully understood by one skilled in the
ait to which it appertains, I will proceed to describe the same in detail and for
that purpose shall refer to the accompanying drawing wherein similar letters and
figures of reference indicate corresponding paits throughout the several views.
Figure 1, is an end view, partly in section, and
Figure 2 a sectional elevation of my improved dredging apparatus;
Figure 2 represents a sectional elevation of the coupling-device for connecting
the chain-drums;
Figures 3-6 are diagrams illustrating the operation or working-order of the
dredging apparatus.
To carry my invention into effect I provide on the main shaft w of the power-
winch two separate chain-drums a' and a one of which a' is firmly keyed on the
said shaft and designed for winding on and off the lifting-chain 6 of the dredging-
scoop while the other chain-drum a² 18 Joosely fixed on the said shaft and designed
for the opening-chain which serves to open the two shell-shaped and hinged
parts of the dredging-scoop S. The two adjoining end-faces of the said chain-

page_text: druins a and a are furnished each with a suitable shoulder or stop 1 and 2
respectively which projecting in the path of each other prevent the loose chain-
drum a from being turned fieely on the winch-shaft w. The loose chain-drum
may therefore be turned independently of the fixed chain-drum a' in either
direction only for a distinct angle of about 300 degrees whereupon the said chain-
drums are coupled by their respective shoulders or stops 1 and 2 engaging with
each other, so that the fixed chain-drum 18 made to drive the loose chain-drum in
one or the other direction respectively.
Motion being imparted to the winch-shaft by means of a suitable gearing de of
which the toothed wheel e is loosoly mounted on the shaft and may be coupled
with the same by means of a suitable clutch The chain-drums may be provided
with suitable friction brakes c' and c.
The independent rotation of the loose chain-dram with respect to the fixed
chain-drum o vice-versu causes a differential motion of the working-chains, that is
to say, of the opening- and of the lifting-chain, whereby the dredging-scoop will be
opened or closed accordingly, while by the co-operation of the said chain-diums
the dredging-scoop 18 lowered or taised.
The operation of the improved diedging apparatus will become more mitelligible
from Figures 3-6
According to Figure 3 the chain-dium a', when rotated in the direction of the
arrow, is raising the closed diedging-scoop S by means of the lifting-chain & and
at the same tune winding on the opening-chain & upon the chain-drum a' because
the shoulder 2 of the latter is in the path or in front of the shoulder 1 of the cham-
dium a so that the rotation of the latter is therefore imparted also to the other
chain-dium a, and both the chain-diums are rotating in the same direction
indicated by the artow
After the dredging-stoop with its load has been sufficiently lifted and brought
(hy swinging around the whole dredging machine) over the place (car, lighter or
the like) for depositing the said load, the chain-drum a' - locked by its biake c'
whilst the chain-dium a' is uncoupled from the diving shaft w moider that this
chain-din may be rotated by the weight of the scoop in the opposite duection
indicated by the arrow, Figure 4. This return-movement of the chain-drum a¹
causes the fifting-chain & to wind off and the dredging-scoop to gape open and
apll its contents. After the shoulder 1 revolving with its chain-dium a' in the
direction indicated by the arrow (Figure 4) has travelled its way, that is to say
has passed an angle of about 300 degrees, it strikes against the other side of the
sboulder 2 of the cham-dum a whereby the chain-hum a' is also locked or set at
est. The winding off motion of the lifting-chain and therefore the opening
operation of the dredging-scoop are then finished. This position of the parts or
this stage of operation is shown by Figure 5.
If now the dredging-scoop S is lowered to grasp another load, the friction-
brake is loosened, whereupon by the weight of the descending diedging-scoop
the chain-drum a³ is turned back in the ducetion of the arrow shown in Figure 5.
The dredging-scoop when lowered down remains opened as its two shell-shaped
parts owing to the peculiar construction of such scoops oppose on offer to the
closing motion some resistance which is sufhcient for turning back also the chain-
drum a by means of its lifting-chain & so that during the lowering operation of
the dredging-scoop the shoulder 1 remains in contact with or testing npon the
preceding shoulder 2, Figure 5
When the dredging-scoop S has reached the bottom or ground (Figure 6) the
friction-brake is entuely slackened and the chain-dium a' or its diving gear de
respectively coupled to the diving shaft w by throwing into gear the clutch f.
The chain-lum a will then be revolved in the direction of the arrow shown at the
side of shoulder 1 (Figure 6), while the chain-druin a' is turned by the influence
of the still descending opening-chain in the opposite direction as shown in
Figure 6 by the arrow relating to the shoulder 2. This opposite rotation of the
chain diuins a¹ and a' lasts until the dredging-scoop S is closed or has reached

page_text: about the position shown by dotted lines in Figure 6. At this moment the
shoulder 1 meets with the oppositely rotating shoulder 2 thereby coupling both
the chain-diums so that on further rotation of the cham-diam af also the chain-
dium a is rotated in the said direction and the lifting-chain as well as the
opening-chain are wound up on then respective chain-diums in order to hoist the
dredging-scoop with its fresh lond, as already explained above as may be clearly
understood from Figure 3 of the drawing.
The diameter of the chain-lums and the lengths of the working-chains must be
chosen in such a proportion that the independent rotation of the said chain-diums
for an angle of about 300° is sufficient for securing the necessary differential
motion between the working chains required for the rehable closing of opening of
the dredging-scoop
In certain cases, for instance when the dredging-scoop has taken a fast hold in
the ground, it is desirable and often necessary to open the shells of the dredging-
scoop and to lift the latter in this opened position For this purpose the said
chai-drums may be furnished with a suitable coupling-device adapted to firmly
connect the chain-diums with each other in the position which comesponds to the
opened position of the diedging-scoop so that on winding on the working-chains
upon the coupled chains-drums the dredging-scoop is first opened by means of the
opening-chain and then lifted by the latter and the lifting-chain in the saul opened
position.
In Figue 2 have shown as an example a coupling-device consisting of a
coupling-bolt g which may be put through suitable holes in the end walls of the
chain-diums and may be held in proper position by means of a small screw-pin gl
o the like engaging the head of the said coupling-bolt and being screwed into
the outer end wall of the chain-drum a².
If in case of exigency the dredging-scoop shall be lifted in its opened position
the cham-dium a' is turned back by hand until the said holes in the chain-diums
are in line (which position is made to correspond to the opened position of the
diedging-scoop) whereupon the coupling-bolt gis inserted and secured by its
screw-pin gas shown by Figure 2. The chain-drums thus coupled to each other
are then duiven or rotated ahead of the driving engine and as at this coupled
position of the chain-drums the lifting- o closing-chain being slackened the
dredging-scoop will be hoisted in its opened position without any load only by the
opening-chain b¹.
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 18-
1. In diedging-machines a device for operating the dredging-scoop, which
consists in airanging for the working-chains of the dredging-scoop two separate
drums on the main shaft of the power-winch, which drums are connected or coupled
with each other by suitable means in such a manner that the said diums are capable
of being turned independently of each other in either direction for an angle of about
300 degrees, in order to allow a differential motion of the working-chains whereby
the dredging-scoop will be closed or opened respectively, substantially as and for
the pin pose set forth.
2. In a diedging-machine the combination of a suitable duiven chain-drum (a')
for the lifting-chain (6') of the dredging-scoop (S) with a chain-drum (a³) for the
opening-chain (62), the said chain-diuins being mounted on the mam-shaft (w) of
the power-winch and provided each with a coupling means, stop, shoulder and the
like 1 or 2 respectively, all substantially as specified.
3. In a diedging-machine having for the working-chains of the dredging-scoop
on the main-shaft of the power-winch two separate chau-drums provided each with
a stop or shoulder or like coupling means a device for firmly connecting the said
chain-drums with each other in the position which corresponds to the opened
position of the dredging-scoop so that on winding on the working-chains upon the

page_text: coupled chain-diums the dredging-scoop is first opened, and then lifted, substantially
as set forth.
4. In a dredging-machine having two separate chain-drums for the working
chains and in which the said chain-drums are provided each with a means for
temporarily coupling the chain-drums with each other, a device for firmly
connecting the said chain-drums consisting of a coupling-bolt (9) adapted to lock
the said chain-drums to each other and held in proper position by means of a
suitable screw-pin (9), all substantially as described
Dated this 4th day of July 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.