Improvements in or connected with Machinery used for Dredging, Excavating or Lifting, Lowering and Discharging Various Substances.
Year: 1891

page_text: Date of Application, 9th Feb., 1891.
Complete Specification Left, 7th Nov., 1891-Accepted, 12th Dec.,, 1891
PROVISIONAL SPECIFICATION.
Improvements in or connected with Machinery used for Dredging,
Excavating or Lifting, Lowering and Discharging Various
Substances.
We, WILLIAM DENT PRIESTMAN and SAMUEL PRIESTMAN, both of the Town
and County of Kingston-upon-Hull. Engineers, do. hereby declare the nature, of-
this invention to be as follows:-.
This invention has reference more particularly to that class of dredging,
excavating, or lifting, lowering, and discharging apparatus or machinery, in which
grapple buckets, skips, scoops, or the like are employed, and worked by two.
chains or ropes, one for the filling or closing and elevation of the skip, or bucket,.
and the other for discharging same, and wherein the paying, out and taking in,
of the discharging chain or rope is effected by a multiple sheave system; and, this
present invention has mainly for its objects to provide improvements whereby the
operation of controlling, mainly, the paying out of the discharging chain or rope
shall be rendered. as easy as possible and absolute in effect, and also to provide
a sheave system which, for a given length of, chain or rope worked, shall take up
less. space than heretofore.
According to the present invention, in a vertical system of multiple sheaves for
the purposes above specified, wherein the upper sheaves are fixed and the lower
ones are adapted to slide and their descent is effected by a weight, we dispose such
weight according to this invention, above the sheaves connected to it; by this
means a greater length of chain or rope can be worked with a given height of
sheave or block gear.
The mode or means by which the paying out of the discharging chain or rope
is controlled-that is, braked-and the bucket, skip, or scoop discharged, consists
in employing in connection with the moving part of the multiple sheave system, a
hydraulic cylinder, and ram, so adapted to operate, that by shutting off the conduit
which conveys the liquid from, (or from and to) the ram cylinder, the flow_or
escape. of fluid therefrom is stopped, and thereby the movable sheaves are also
stopped, and the discharging chain or rope braked and held. Thus,, it, will be
seen, by this simple mode of working the sheave system, a very ready. and absolute
control is provided.
In one and. a, convenient arrangement, by which the above described mode of
controlling the apparatus, may be carried out, the ram and cylinder are directly
connected to the sheave frame and weight, the ram being mounted, say, to the
upper sheave frame, whilst the ram cylinder is formed in the weight itself, or
partly in the weight and partly in a provision thereon. And further, the ram
may be hollow, and serve as the conduit by which the fluid used passes in and
out of the cylinder. And in connection therewith, a reservoir or chamber may
be provided in or in connection with the upper part of the sheave frame, to hold
the liquid passed from and supplied to the ram cylinder, as it is alternately
discharged from, and drawn into it.
The valve by which the flow of liquid to or from the cylinder is effected may,
in this arrangement, be placed in or on the ram, and by merely working it and
closing or opening the passage, the movement of the lower sheaves, and thereby
the discharging chain or rope, can be instantly arrested or braked, or free movement
given, at will.
The above construction constitutes a convenient arrangement for carrying out
the mode of controlling the paying out of the kecking or discharging chain or
rope and discharging the bucket or skip, but it is to be understood that such mode

page_text: or method of machinery of the kind herein referred to may be carried out in many
different ways, and that the parts employed therefore are susceptible of various
modifications under the invention.
Dated this 7th day of February 1891.
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Applicants' Patent Agents.
VAIT LIPID DI MUITIOAITUR.
Improvements in or connected with Machinery used for Dredging,
Excavating or Lifting, Lowering and Discharging Various
Substances.
We, WILLIAM DENT PRIESTMAN and SAMUEL PRIESTMAN, both of the Town
and County of Kingston-upon-Hull, Engineers, 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:-
This invention has reference more particularly to that class of dredging,
excavating, or lifting, lowering, and discharging apparatus or machinery in which
grapple buckets, skips, scoops, or the like, are employed, and worked by two chains
or ropes, one for the filling or closing and elevation of the skip, or bucket, and
the other for discharging same, and wherein the paying out and taking in of the
discharging chain or rope is effected by a multiple sheave system; and this present
invention has mainly for its object to provide improvements whereby the opera-
tion of controlling, namely, the paying out of the discharging chain or rope shall
be rendered as easy as possible and absolute in effect, and also to provide a sheave
system which for a given length of chain or rope worked, shall take up less space
than heretofore.
According to the present invention, in a vertical system of multiple sheaves for
the purposes above specified, wherein the upper sheaves are fixed and the lower
ones are adapted to slide, and their descent is effected by a weight, we dispose
such weight, according to this invention, above the sheaves connected to it; by this
means a greater length of chain or rope can be worked with a given height of
sheave or block gear.
The mode or means by which the paying out of the discharging chain or rope
is controlled--that is, braked, and the bucket, skip, or scoop, discharged, consists
in employing in connection with the moving part of the multiple sheave system, a
hydraulic cylinder and ram, so adapted to operate, that by shutting off the conduit
which conveys the liquid from, (or from and to the ram cylinder, the flow or
escape of fluid therefrom is stopped, and thereby the movable sheaves are also
stopped and the discharging chain or rope braked and held. Thus, it will be seen,
by this simple mode of working the sheave system, a very ready and absolute
control is provided.
In one and a convenient arrangement, by which the above described mode of
controlling the apparatus may be carried out, the ram and cylinder are directly
connected to the sheave frame and weight, the ram being mounted, say, to the
upper sheave frame, whilst the ram cylinder is formed in the weight itself, or
partly in the weight and partly in a provision thereon. And further, the ram
may be hollow, and serve as the conduit by which the fluid used passes in and
out of the cylinder. And in connection therewith, a reservoir or chamber may
be provided in or in connection with the upper part of the sheave frame, to hold
the liquid passed from and supplied to the ram cylinder, as it is alternately
discharged from, and drawn into it.
The valve by which the flow of liquid to or from the cylinder is effected may,
in this arrangement, be placed in or on the ram, and by merely working it and
closing or opening the passage, the movement of the lower sheaves, and thereby

page_text: The discharging cham or rope, can be fustantly arrested or Draked, or free move-
ment given, at will.
To clearly explain our invention, we will now describe it by the aid of the
drawings accompanying the Specification, and which illustrate examples of
apparatus designed in accordance with and for carrying out the improvements, the.
nature of which has been above explained.
Figure 1 is a sectional elevation shewing one example of apparatus provided
with our improvements;
Figure 2 is a side elevation of same; and
Figure 3 a plan.
Figure 4 shews a modified construction of the reservoir above referred to, and
parts connected therewith.
Figures 5, 6, and 7, and sectional views shewing other modifications of the reservoir
and other parts connected with it.
The same letters and figures of reference are used to denote the same or
equivalent parts wherever they occur in the drawings.
Referring now to the drawings, a is the hydraulic cylinder; e is a ram or piston
working in a; i is the water or other liquid reservoir into and out of which the
liquid flows as the apparatus works d being an open neck thereon; and is the
frame by which the reservoir i, piston or rame, and other parts connected there-
with, are supported, and upon which the cylinder a slides up and down.
The reservoir i, in this example, constitutes the fixed axle for the upper pulleys,
and serves to connect together the upper part of the frame b; and between it and
the piston or ram e is interposed the valve d by which the flow of fluid to and
from the cylinder a and piston e is controlled. The lower or movable pulleys
are, as above stated, mounted beneath the cylinder a, by which arrangement the
greatest length of chain or rope can be worked with a given height of sheave or
block gear.
The cylinder a with its guides a', and brackets a' by which the axle f' of the
pulleys is mounted, constitutes the weight by which the descent of said
pulleys, and the taking in of the discharging rope or chain of the skip or grab, is
effected.
The cock or valve d may be of an ordinary screw down or other suitable type,
and is worked, that is, opened and shut, from a lever ', connected to the valve
spindle d, the outer end of which is supported by the bowed bracket d³, said lever
being operated from any suitable point by a cord, rope, or other means.
The kecking or discharging rope (or chain) kis shewn in Figure 2, one end of
it being fixed to the shackle on the cylinder u.
The part of machinery used for dredging, excavating or lifting, lowering, or
discharging substances, herein described, may be fitted in any suitable position on
such machinery, as may be deemed convenient or expedient.
In operation, when the lifting chain of apparatus or machinery of the kind
herein before referred to, is running out, the cylinder u and sheaves will be lifted
by the weight of the grab, and the rope (or chain) paid out, retaining, in some
instances, the grab in its open position, and in fact constituting the lowering chain
or rope. During this operation the liquid in a and e, is being forced out into
the reservoir or receiver i, the valve or cock d having been opened to admit the
free flow of liquid to take place. Then, on the hauling up of the grab or bucket
by the lifting chain, the rope (or chain) will be taken in by the falling of the
cylinder-weight a with its sheaves, the cock or valve d being still open and
allowing the free ingress or inflow of liquid from the reservoir i, to the cylinder a
to take place. The operation of kecking or discharging is next performed, and.
in this operation the hydraulic arrangement described comes mainly into use;
namely, to effect the discharge or kecking of the grab or bucket, the valve dis
closed and all escape of liquid from the cylinder a and piston e, prevented, and the
lifting chain is slacked or paid out; whereupon, by reason of the fixing of the
lower moving sheaves ƒ by preventing the escape of liquid from a and e, the grab

page_text: or bucket discharging mechanism is held; and said grab or bucket opens, allowing
its contents to fall out.
The modification shewn in Figure 4 consists merely in providing the controlling
valve within the reservoir in a diaphragm d*.
In the modification shewn in Figure 5, the controlling valve d is provided in the
neck on the end of the hollow spindle, the reservoir being provided above
the neck. i³.
The modification shewn in Figure 6, is of a like construction, to that shewn, in
Figure 5, that is to say, the hollow spindle does not serve as. the reservoir or
receiver, such reservoir or receiver being disposed above the pulleys or sheaves.c
and connected with by the neck, the valve d being on the entrance of said
neck.
In the modification shewn in Figure 7, the reservoir-i is disposed directly on
the upper end of the piston or ram e, and beneath the upper pulleys or sheaves_c,
whilst the controlling valve d is disposed at the point of connection between the
reservoir and the piston e, it being adapted to be lifted and lowered off and onto
its seat by the lever d.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we wish to state, in conclusion,
that the different mechanisms herein above set forth with reference to the drawings
for the purposes specified, may be modified in various ways,, and equivalents used,
without departing from the inain or controlling features thereof; and they may
be arranged and constructed differently according to the various requirements or
conditions of their application, and to meet special cases, and, we declare that what
we claim is―
1. The improvement herein set forth connected with machinery used for purposes
such as specified, that is to say, effecting the control of the paying out of the
discharging rope or chain of such machinery by hydraulically controlling the
movement of the weight and rope or chain sheaves or pulleys.by which the multiple
sheave system herein referred to is operated.
2. In multiple sheave mechanisms, by which the discharging or kecking rope
or chain of apparatus of the kind herein referred to is taken in and paid out, the
relative arrangement of sheaves and moving weight herein described, that is to
say, the disposition of said weight between the upper fixed sheaves or pulleys and
the lower pulleys connected to said weight; for the purposes specified.
3. Multiple sheave mechanism for taking in and paying out the discharging or
kecking rope or chain of machinery. of the kind herein referred to, comprising a
hydraulic cylinder constituting a weight for taking in said rope or chain, sheaves
connected therewith, and a fixed set of sheaves above same.
4. Multiple sheave mechanism for taking in and paying out the discharging or
kecking rope or chain of machinery of the kind herein referred to, comprising a
cylinder a, upper and lower sheaves c and piston or rame, a reservoir i, and a
valve by which communication between said reservoir and said cylinder is made
or broken; substantially as and for the purposes set forth.
5. The mechanism. for taking in and paying out the discharging or kecking
rope or chain of apparatus or machinery of the kind herein referred to, having
its parts constructed; and arranged or combined, as set forth with reference to
Figures 1, 2, and 3..
6. The constructions and arrangements of reservoir i, and upper sheaves c, set
forth respectively with, reference to Figures 1, 2, and 3; Figure 4; Figure 5
Figure 6 and Figure. 7 of the drawings.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.