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Патент USA US2117326

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May 17, 1938.
'
ca. H. HUTTON'
2,117,326
DREDGE
Filed March 10, 1937
4 Sheets-Sheet l
H drijy?
May 17, 1938.
G. H. HUTTON
DREDGE
2,117,326
‘
Filed March 10, 1957
4 Sheets-Sheet 2
Fig. 1.
’
3y
#TTORNEi '
May 17, 1938.
G. H. HUTTON
DREDGE
_
‘
2,117,326
I
Filed March 10, 1957
I
4 Shqets-Sheet 4
Fig. 2
35
35
'24
Patented May 17, 1938
2,117,326
UNITED STATES PATENT OFFEQE
2,117,326
DREDGE
Gerald Hillsdon Hutton, London, England
Application March 10, ‘1937, Serial No. 130,201
In Great Britain May 14, 1936
10 Claims.
This invention relates to dredges of the kind
in which the means for dislodging earth from a
bank are carried upon a radial arm commonly
known as a ladder, which is pivotally mounted
5 adjacent one of its ends on a bifurcated pontoon
or ?oating structure with means for raising or
lowering the other end of the ladder through the
bifurcation to vary the depth at which dredging
takes place, to lift the ladder entirely above the
10 water line, and to move the lower end of the lad
der laterally for dislodging new earth.
In the operation of dredges of this kind, the
ladder may be subjected to lateral pressure which
tends to impose severe stresses on its mounting.
15 It is common practice to counteract these stresses
by extending a pair of bow mooringside lines
of the pontoon about sheaves on the shore to
points adjacent the bottom of the ladder. How
ever, these lines operate at very inconvenient
no angles, which become worse as the digging depth
is increased and also when the ladder is swung
towards the bank in operation.
With a view to avoiding the’ disadvantages of
the aforesaid practice, it has previously been pro
25 posed to provide a transverse boom as part of
the superstructure of the dredge, the bottom end
of the ladder being stayed in the transverse di
rection by guy ropes or the like, which prefer
ably form part of the lifting andllowering tackle
39 supporting the bottom end of the ladder,
stretched between it and the ends of said boom.
The invention has for an object to provide im
proved lateral bracing means for the ladder,
which avoids the employment of additional
35 sheaves or pulleys on the lower end of the ladder
while enabling the bow mooring side lines to
be secured to bollards 0n the shore instead of
sheaves as heretofore commonly practised.
According to this invention, the ladder of a
40 dredge of the kind referred to is laterally braced
by guys. extending from anchorages adjacent the
lower end thereof to anchorages located at a
distance from each side of the dredge superstruc
ture and in line with the pivotal axis of the
45 ladder.
The anchorages which are in line with the piv
otal axis of the ladder may be supported by a
transverse frame including a member or mem
bers projecting from the sides of the superstruc
50 ture. Members projecting from each side of the
superstructure may be articulated, preferably
universally, and braced by guys extending from
adjacent their outer ends to anchorages rigidly
located on the transverse frame and/or towards
55 the rear of the pontoon or superstructure.
(0]. 37-69)
The aforesaid frame may constitute the whole
or part of a runway for a lifting crane. Further,
it may incorporate a centre cross truss of the
superstructure.
Turnbuckle or equivalent means are preferably 5
provided for adjustment or equalization of the
lengths or tensions of the guys, and the anchor
ages may include shock-absorbing means such as
springs, preferably compression springs inter
posed between the guys and ?xed abutments.
10
An embodiment of the invention will be de
scribed, by way of example, with reference to the
accompanying diagrammatic drawings, where
in:
Figures 1 and 1a taken together are a side ele- 15
vation of the dredge with a ladder supporting a
chain of buckets;
Figures 2 and 20!. combined are a plan view
corresponding to Figures 1 and 1a, and
Fig. 3 is a rear view.
20
As shown in Fig. 1, the chain of buckets I,
generally delineated by a pair of chain-dotted
lines, runs about a driven upper tumbler 2 and
an idle lower tumbler 3, the latter being located
at the free end of a ladder 4 which is pivoted 00- 25
axially with the driving tumbler 2.
The upper,
pivoted end of the ladder is supported by a su
perstructure 5 mounted on a pontoon 6 which
(as shown in Fig. 2) is bifurcated to afford a
channel ‘I wherein the ladder 4 is accommodated. 30
The ladder 4 with the bucket chain I supported
thereby is movable between its lowermost opera
tive position, as shown in full lines in Fig. 1,
and an upper limiting operative position 4a, as
desired, and further to a position 4?; wherein the 35
entire ladder and bucket chain is raised above
the water level. The raising and lowering of the
ladder is effected by means of a rope 8 which
passes about a lower pulley block 9 suitably con
nected to the ladder 4 and an upper pulley block 40
I0 whence it is taken to a winch I‘! (Fig. 2). The
upper pulley block I 0 is supported by a bow
gantry II which is incorporated in the forepart
of the dredge superstructure 5.
The driving tumbler 2 of the bucket chain l is 45
actuated, through duplicate gear trains I2, by a
belt,I3 from a countershaft l4 which is driven
by a belt I5 from a main drive motor I6. The
countershaft I4 also serves, through a suitable
clutch and reduction gearing, to actuate the lad- 50
der hoisting winch I'I above mentioned.
Material dug out by the chain of buckets I is
deposited in a chute !8 by which it is conveyed
to the interior of a rotary screen I9, wherein it
is sorted and- thereafter dealt with in any con- 55
2,117,326
2
venient manner according to known principles.
The above described means are merely typical
of a kind of dredge to which the invention is
applicable, and are described to facilitate un
derstanding and carrying ‘ into practice of the
invention, without intention of limiting the scope
thereof.
Under the invention, the ladder d is braced
against lateral stresses by a pair of guys 28 which
extend from anchorages 2!, located adjacent the
lower end of the ladder ii, to anchorages 22 lo
of the mooring lines 35 which is disposed on the
same side as the said edge.
In a dredge having the ladder braced accord
ing to the invention, the lateral stresses on the
ladder are transmitted to the body of the pontoon
by the triangulated bracing system constituted
by the projecting beams 23 in co-operatio-n with
cated at a distance from each side of the pontoon
6 and in line with the axis of the driving tum
bler 2, about which axis the ladder 4 also pivots.
15 The anchorages 22 are mounted at the ends of
strut members 23 extending laterally from the
superstructure 5 and universally articulated at
23a to a transverse frame which includes a cross
truss of the superstructure and affords a horizon
20 tal runway for a crane (not shown) provided in
known manner to facilitate handling of the main
drive elements, e. g. the elements of the gear
trains E2. The said horizontal runway is consti
tuted by rails 24 laid on a pair of horizontal trans
25 verse beams 25 and 26 included in said frame.
The beam 25 is supported above the superstruc~
ture by a pair of uprights 2'7 and bracing associat
ed with the supports for the spindles of the gears
comprised in the trains l2.
The beam 25 is sup~
30 ported by a pair of uprights 28 and a pair of oppo
sitely inclined braces 29 (Fig. 3) so that the mem
bers 26, 28 and 29 together constitute a cross truss
for the superstructure. The ends of the beams
are further supported by outwardly inclined com
35 pression struts 30, as shown in Fig. 3, and the
frame is completed by the universally articulated
members 23 and guys 32 extending upwardly from
the outer ends of said members to the ends of the
beam 25.
The ends of the members 23 are further braced,
as shown in Figs. 2 and 3, against the pull ex
erted by the guys 20, by means of guys 3| extend~
ing to the rear corners of the pontoon 6.
The guys 29, 3! and 32 are each provided with
a turnbuckle 33 for adjusting or equalizing their
lengths or tensions, and shock-absorbing means
34 including a compression spring, whereby the
bracing system is made slightly resilient to enable
it to resist minor shock stresses which might, for
50 example, cause one of the guys to snap if these
were unyieldingly secured at both ends. The
mooring of the dredge is effected by the known
side lines, one pair of these side lines 35 extend
ing laterally in opposite directions from the bow
of the pontoon 6 and another pair 36 extending
laterally from the stern of the pontoon 6. These
four side lines are also, in known manner, actu
ated for elfecting bodily or swinging movement of
the pontoon by means of a series of winches 31
mounted on the pontoon, to which winches the
lines are led over suitably disposed pulleys.
However, the bow side lines 35 are secured direct~
ly to bollards on the shore so that lateral mooring
of the pontoon at its forward end is effected en
65 tirely independently of the bucket ladder 4.
In the operation of a dredge of the type to
which the invention relates, the bucket chain
and its supporting ladder are often subjected to
considerable lateral stresses. For example, when
70 the buckets are digging in a position such as that
shown in Fig. 2, they are subjected to load at
their forward edges and one of their side edges,
and this sets up a considerable lateral pressure
in the direction away from the side edge which
75 is operating and considerable tension in that one
the superstructure 5, the guys 20, SI and 32, and
the ladder 4 itself. Moreover, these stresses are
applied to the pontoon at a considerable distance 10
from its centre line so that they are more con
veniently resisted and none of the members in
cluded in the stressed system thereby formed is
subjected to an excessive strain, while in particu
lar twisting stresses on the ladder mounting are 15
eliminated.
Moreover, on account of the upper anchorages
22 of the guys 20 being disposed in line with the
pivotal axis of the ladder 4, the bracing system
operates in exactly the same advantageous man 20
ner whatever the angle at which the ladder 4
is disposed in digging, and free raising and low
ering of the ladder by means of the ordinary
hoisting tackle is not interfered with.
The forward corners of the pontoon are cut 25
away as indicated at 38 (Fig. 2) if this is neces
sary to afford clearance for the guys 20 relative
to the pontoon in the raising and lowering of the
ladder 4.
30
1. A dredge comprising a bifurcated pontoon,
a superstructure on the pontoon, a ladder mount
ed by its upper end pivotally about a horizontal
axis on the superstructure and extending through
the bifurcation, means carried by the ladder for 35
digging submerged earth, and means transversely
bridging the bifurcation for raising and lowering
the free end of the ladder for varying the depth of
digging and for lifting the ladder and digging
means entirely above the water line, in combina 40
tion with lateral bracing means for the ladder
comprising anchorage means adjacent the bot
tom of the ladder, pivotal anchorage means lo
cated at a distance from each side of said super
structure and in line with said pivotal axis, and 45
guys extending from said ?rst mentioned anchor
age means to said last mentioned anchorage
means so as to be clear of the outer sides of the
pontoon in all positions of the ladder.
2. A dredge comprising a bifurcated pontoon, 50
a superstructure on the pontoon, a ladder mount
ed by its upper end pivotally about a horizontal
axis on the superstructure and extending through
the bifurcation, means carried by the ladder for
digging submerged earth, and means trans 65
versely bridging the bifurcation for raising and
lowering the free end of the ladder for varying the
depth of digging and for lifting the ladder and
digging means entirely above the water line, in
combination with lateral bracing means for the 60
ladder comprising a transverse member project
ing from each side of the superstructure and at
least partly in line with said pivotal axis, anchor
age means adjacent the bottom of the ladder, piv
otal anchorage means adjacent the outer ends of 65
said transverse members and in line with said
pivotal axis, and guys extending from said ?rst
mentioned anchorage means to said last men
tioned anchorage means so as to be clear of the
outer sides of the pontoon in all positions of the 70
ladder.
3. A dredge comprising a bifurcated pontoon,
a superstructure on the pontoon, a ladder mount
ed by its upper end pivotally about a horizontal
axis on the superstructure and extending through 75
2,117,326
the bifurcation, means carried by the ladder for
digging submerged earth, and means transversely
bridging the bifurcation for raising and lower
ing the free end of the ladder for varying the
depth of digging and for lifting the ladder and
digging means entirely above the water line, in
combination with lateral bracing means for the
ladder comprising two transverse members pro
jecting one from each side of the superstructure
and at least partly in line with said pivotal axis
the inner end of each of said members being
articulated to the superstructure, abutments on
the superstructure, bracing means extending
1,5
from said abutments to the outer ends of said
members, anchorage means adjacent the bottom
of the ladder, pivotal anchorage means adjacent
the outer ends of said members and in line with
said pivotal axis, and guys extending from said
?rst mentioned anchorage means to said last
20 mentioned anchorage means so as to be clear of
the outer sides of the pontoon in all positions of
the ladder.
4. A dredge comprising a bifurcated pontoon,
a superstructure on the pontoon, a ladder mount
25 ed by its upper end pivotally about a horizontal
axis on the superstructure and extending through
the bifurcation, means carried by the ladder for
digging submerged earth, and means transversely
bridging the bifurcation for raising and lowering
30 the free end of the ladder for varying the depth
of digging and for lifting the ladder and digging
means entirely above the water line, in combi
nation‘ with lateral bracing means for the lad
der comprising a transverse frame in the super
35 structure, said frame constituting at least in part
a crane runway, a transverse member of said
frame projecting from each side of the super
structure and at least partly in line with said
pivotal axis, anchorage means adjacent the bot
tom of the ladder, pivotal anchorage means
adjacent the outer ends of said transverse
members and in line with said pivotal axis,
and guys extending from said ?rst mentioned
anchorage means to said last mentioned anchor
45 age means so as to be clear of the outer sides of
the pontoon in all positions of the ladder.
5. A dredge comprising a pontoon, a super
structure on the pontoon, a ladder mounted by
its upper end pivotally about a horizontal axis
50 on the superstructure, means carried by the lad
der for digging submerged earth, and means for
raising and lowering the free end of the ladder
for varying the depth of digging and for lifting
the ladder and digging means entirely above
55 the water line, in combination with lateral brac
ing means for the ladder comprising a trans
verse frame in the superstructure, said frame
constituting at least in part a crane runway, a
transverse member of said frame projecting from
60 each side of the superstructure and at least part
ly in line with said pivotal axis, the inner end
of each of said members being universally ar
ticulated in said frame, abutments on the super
structure and on said frame, bracing means ex
tending from said abutments to the outer ends
of said members, anchorage means adjacent the
bottom of the ladder, pivotal anchorage means
adjacent the outer ends of said members and in
line with said pivotal axis, and guys extending
70 from said ?rst mentioned anchorage means to
said last mentioned anchorage means.
6. A dredge comprising a bifurcated pontoon,
a superstructure on the pontoon, a ladder mount
ed by its upper end pivotally about a horizontal
75 axis of the superstructure and extending through
3.
the bifurcation, means carried by the ladder for
digging submerged earth, and means transversely
bridging the bifurcation for raising and lowering
the free end of the ladder for varying the depth
of digging and for lifting the ladder and dig
ging means entirely above the water line, in com
bination With lateral bracing means for the lad
der comprising a transverse frame in the super
structure, a centre cross truss of the superstruc
ture incorporated in said frame, a transverse
member of said frame projecting from each side
of the superstructure and at least partly in line
with said pivotal axis, anchorage means adja
cent the bottom of the ladder, pivotal anchorage
means adjacent the outer ends of said trans 15
verse members and in line with said pivotal axis,
and guys extending from said ?rst mentioned
anchorage means to said last mentioned anchor
age means so as to be clear of the outer sides of
the pontoon in all positions of the ladder.
7. A dredge comprising a bifurcated pontoon,
a superstructure on the pontoon, a ladder mount
ed by its upper end pivotally about a horizontal
axis on the superstructure and extending through
the bifurcation, means carried by the ladder for 25
digging submerged earth, and means transversely
bridging the bifurcation for raising and lowering
the free end of the ladder for varying the depth
of digging and for lifting the ladder and digging
means entirely above the water line, in combina 30
tion with lateral bracing means for the ladder
comprising a transverse frame in the superstruc
ture, a centre cross truss of the superstructure
incorporated in said frame, said truss constitut
ing at least in part a crane runway, a transverse 35
member of said frame projecting from each side
of the superstructure and at least partly in line
with said pivotal axis, anchorage means adjacent
the bottom of the ladder, pivotal anchorage
means adjacent the outer ends of said transverse 40
members and in line with said pivotal axis, and
guys extending from said ?rst mentioned anchor
age means to said last mentioned anchorage
means so as to be clear of the outer sides of the
pontoon in all positions of the ladder.
45
8. A dredge comprising a pontoon, a super
structure on the pontoon, a ladder mounted by
its upper end pivotally about a horizontal axis
on the superstructure, means carried by the lad
der for digging submerged earth, and means for 50
raising and lowering the free end of the ladder
for varying the depth of digging and for lifting
the ladder and digging means entirely above the
water line, in combination with lateral bracing
means for the ladder comprising a transverse 55
frame in the superstructure, a centre cross truss
of the superstructure incorporated in said frame,
said truss constituting at least in part a crane
runway, a transverse member of said frame pro
jecting from each side of the superstructure and 60
at least partly in line with said pivotal axis, the
inner end of each of said members being uni
versally articulated in said frame, abutments on
the superstructure and on said frame, bracing
means extending from said abutments to the 65
outer ends of said members, anchorage means
adjacent the bottom of the ladder, pivotal an
chorage means adjacent the outer ends of said
members and in line with said pivotal axis, and
guys extending from said ?rst mentioned anchor 70
age means to said last mentioned anchorage
means.
9. A dredge comprising a pontoon, a super
structure on the pontoon, a ladder mounted by
its upper end pivotally about a horizontal axis on 76
2,117,326
the superstructure, means carried by the ladder,
for digging submerged earth, and means for rais
ing and lowering the free end-of the ladder for
varying the depth of digging and for lifting the
ladder and digging means entirely above the
water line, in combination with lateral bracing
means for the ladder comprising a transverse
frame in the superstructure, said frame consti
tuting at least in part a crane runway, a trans
verse member of said frame projecting from each
side of the superstructure and at least partly in
line with said pivotal axis, the inner end of each
of said members being universally articulated in
said frame, abutments on the superstructure and
15 on said frame, bracing means extending from
said abutments to the outer ends of said mem
bers, anchorage means adjacent the bottom of
the ladder, pivotal anchorage means adjacent the
outer ends of said members and in line with said
pivotal axis, guys extending from said ?rst men
tioned anchorage means to said last mentioned
anchorage means, and turnbuckle means incor
porated in said guys for adjusting the lengths and
tensions thereof.
10. A dredge comprising a pontoon, a super
25
structure on the pontoon, a ladder mounted by
its upper end pivotally about a horizontal axis
on the superstructure, means carried by the lad
der for digging submerged earth, and means for
raising and lowering the free end of the ladder
for varying the depth of digging and for lifting
the ladder and digging means entirely above the
water line, in combination with lateral bracing
means for the ladder comprising a transverse
frame in the superstructure, a centre cross truss
of the superstructure incorporated in said frame,
said truss constituting at least in part a crane
runway, two transverse members of said frame
projecting one from each side of the superstruc
10
ture and at least partly in line with said pivotal
axis, the inner end of each of said members
being universally articulated in said frame, abut
ments on the superstructure and on said frame,
bracing means extending from said abutments 15
to the outer ends of said members, anchorage
means adjacent the bottom of the ladder, pivotal
anchorage means adjacent the outer ends of said
members and in line with said pivotal axis, shock
absorbing means each comprising an opposed 20
couple of relatively slidable members and a spring
located under compression between said slidable
members, one of said slidable members being
attached to each of said pivotal anchorage
means, and a guy extending from each of said 25
?rst mentioned anchorage means to the other of
said slidable members.
GERALD HILLSDON HUTTON.
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