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Патент USA US3083848

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April 2. 1963
R. L. BEVARD
3,083,838
CRANE
Filed Aug. 15, 1962
4 Sheets-Sheet 1
INVENTOR.
Roger L. Beva rd
_
Anornev
'April 2, 1963
R. L. BEVARD
3,083,838
CRANE
Filed Aug. 15, 1962
vb
4 Sheets-Sheet 2
i
5
_-._.+HWiw.
______
______
.______
INVENTOR
Roger L. Bevard
April 2, 1963
R. L. BEVARD
3,083,838
CRANE
Filed Aug- 15, 1963
as
4 sheets-$119“ 3
20
I86
20!
FIG.5
INVENTOR
Roger L. Bevurd
6W4
MW
Attorney
April 2, 1963
R. L. BEVARD
3,083,838
CRANE
Filed Aug. 15, 1962
4 Sheets-Sheet 4
INVENTOR
Roger L. Bevord
‘Attorney
llnit
rtes atent
1
lee
3,083,838
Fatented Apr. 2, i963
2
illustration of an arrangement for limiting the upper
3,083,838
CRANE
Roger L. llevard, Iron Mountain, Mich, assignor to Lake
Shore, Inc, iron Mountain, Mich, a corporation of
l ichigan
Filed Aug. 15, B62, Ser. No. 217,040
28 Qlaims. ((31. 212-74)
travel of the load engaging mechanism.
With reference to the drawings, FIG. 1 shows the crane
16 supported from overhead frame 14 below decks of
vessel ‘12. Crane 10 includes booms which are extendable
through ports 16 and .18 located on either side of the ship.
With this arrangement, cargo can be hoisted from dock
29 (or a lighter) hauled into the ship and lowered through
hatches to any desired level for stowage. Although this
This invention relates to cranes and, more particularly,
10 invention is particularly well suited for use in the environ
to ship mounted cranes.
ment shown, it will be appreciated that its basic concept
An object of this invention is to provide a crane having
is applicable to any shipboard crane as well as to cranes
an increased reach while maintaining a compact stowed
used other than aboard ship.
size and a relatively simpli?ed construction.
More particularly, frame 14 includes athwart beams 22,
Another object of this invention is to further provide
such a crane including a load trolley of relatively simple 15 24, and 26. Beams 28, 30 and 31 are part of the ship
structure and brackets 32 and 34 connect beams 22, 214
and lightweight construction.
and 26 to beams 28, 3t) and 31 to complete connection
A further object of this invention is to provide a crane
of the frame to ship overhead 15. For convenience only
having telescoping booms and a load trolley arranged for
a portion of frame 14 has been illustrated and it will be
joint and relative movement and wherein the vertical posi
appreciated that the more than two brackets, 32 and 34,
tion of the load engaging mechanism of the crane does
are normally provided.
not change while the boom and trolley move horizontally.
A pair of booms 40 and 42 are telescopically arranged
Still another object of this invention is to limit the
and supported from frame ‘14. Boom 40 comprises a pair
travel of the load engaging means; and, further, to do so
of parallel T-shaped members 44 and 46 (see FIG. 6).
without materially adding to the complexity of the crane
25 Member 44 is made up of horizontal portions 48 and 5t}
on the load trolley.
interconnected by vertical portions 52 and 54 and member
For the achievement of these and other objects of this
46 is made up of horizontal portions 56 and 58 inter
invention, it is proposed to provide a crane including at
connected by vertical members 6i) and 62. The inner
least a pair of telescopically arranged booms so inter
faces of members 48 and 50 are suitably machined to
connected that driving one boom produces both joint
and relative movement of the booms. Such an arrange 30 provide ?nished surfaces 64 and 65 and the inner faces
of members 55 and 58 are also provided with ?nished
ment provides both a compact stowed size and an increase
surfaces 68 and 70. These ?nished surfaces provide
in reach for a given size boom. A load trolley is sup
guides to receive roller assemblies 36 and 38 supported
ported from and movable with one of the booms and is
from opposed sides of the ?xed frame. Members 44 and
so interconnected with both booms that relative move
ment between the booms moves the load trolley relative 35 46 are interconnected by transversely extending horizon
tal braces 72, 74 and 76 to structurally complete boom
to the boom from which it is supported. To further sim
46}. Thus, boom 40 is supported from and for movement
plify the crane construction, the hoist mechanism is
relative to the frame by roller assemblies 36 and 38.
located exteriorly of the load trolley with the hoist cable
Racks 80 and 32 are provided on elongated members 4-4
being reeved on the booms and the trolley so that the
vertical position of the load engaging portion of the hoist 40 and 46 for engagement by pinions 84 and 86 carried on a
shaft 88. Shaft 38 is connected to motor 78 by coupling
mechanism does not vary during horizontal movement
90 and a suitable gear box 91. Accordingly, rotation of
between the booms and trolley. Preferably, the above
shaft 88 causes boom 49 to move athwartship.
described relative movement is accomplished through a
A limit switch 92 is connected to shaft 88‘ and is driven
simple arrangement in which constant lengths of cable are
simultaneously with boom 40. The limit switch is con
reeved between the relatively movable members. Thus,
nected in circuit with motor 78 to controlthe extent of
one length establishes a driving connection between the
travel of boom 40 and prevent undesirable overtravel.
booms and another length establishes a driving connection
The structure of limit switch 92 is well known to those
between one of the booms and the trolley. With such an
arrangement synchronized movement is provided between 50 skilled in the art and therefore is not shown. Further
more, suitable overtravel stops (not shown) can be pro
the three elements. In effect, the hoist cable is also a con
vided between frame 14 and boom 40, if desired.
stant length of cable, except when paying out or taking in
Boom 42 includes spaced parallel portions 94 and 96
cable, supporting the load engaging hook so as to main
each comprising stacked channel members 98, 100 and
tain the hook at a constant vertical height during boom
and trolley movement.
55 102, 104 respectively. Portions 94 and 96 are connected
by transversely extending braces 196 and each carries a
Other objects and advantages will be pointed out in, or
plurality of roller assemblies 108 and 110. Roller assem
be apparent from, the speci?cation and claims, as will
blies 168 are engaged between a longitudinal ?ange 116
obvious modi?cations of the single embodiment shown in
extending from vertical member 54 and a ?nished sur
the drawings, in which:
face 118 of horizontal portion 59. A brace 120 extends
60
FIG. 1 is a schematic illustration of a typical installa
between ?ange 116 and horizontal portion 48 to provide
tion;
FIG.
FIG.
MG.
FIG.
FIG.
vertical reinforcement for the ?ange.
Similarly, roller
2 is a top plan view of the crane;
assemblies 110 are engaged between a longitudinal ?ange
3 is a partial bottom view of the crane;
122 and ?nished surface 124 with a brace 126 providing
4 is an enlarged view of a cable anchor;
65 vertical reinforcement for the ?ange. In this manner,
5 is a side elevation of the booms;
boom 42 is supported from boom 40 for movement there
6 is a partial section generally along line 6-6
with and is also capable of moving relative to boom 40.
For stowage boom 42 is withdrawn into boom 40 to align
of FIG. 2;
FIG. 7 is a schematic reeving diagram;
the ends of the booms so as to occupy a minimum of
FIG. 8 is a side elevation of the load trolley;
70 space and, as is well known in the art, suitable stowage
FIG. 9 is a top plan view of the load trolley; and
pins (not shown) can be provided to lock the booms in
stowed condition. As illustrated in FIG. 2, boom 40 has
FIG. 10 is a partial view of and FIG. 11 is a schematic
3,083,838
3
4
been displaced to the left by the rack and pinion combina
speed of boom 46 can be selected as desired but the above
tion and it will be noted that boom 42 is partially ex
tended for boom 48. This extension of boom 42 oc
relationship between its speed and that of the trolley and
curs as a result of relative movement between the boom
For convenience the various cable anchors have been
shown schematically and each preferably takes the form
of that shown in FIG. 4, including spaced apart brackets
48 and the frame and through an arrangement to be de
scribed hereinafter.
A load trolley 138 is supported ‘from inner boom '42
and includes a generally rectangular body 129 from
which two pairs of rollers 132 and ‘134 are supported.
The rollers engage lower ?anges 136 and 138 of portions
190 and 104 so that the trolley is movable with and rela
tive to inner boom 42. The arrangement ‘for producing
movement of the load trolley relative to boom 42 will be
described more completely hereinafter. The load trolley
also includes sheaves 1319 and 148 rotatably supported
from body 129 and load engaging mechanism 142 sus
pended between the sheaves by hoist cable 144. The load
engaging mechanism preferably takes the form of a block
including sheave 148 and hook 150.
Preferably, relative movement of the booms and load
trolley is produced through a sheave and cable arrange
ment wherein constant lengths of cable interconnect the
other boom remains the same.
196 and 198 connected to a particular structural mem
ber, e.g. frame 14. Threaded studs 200 and 282 pass
through the brackets and each includes a cable connection
204. Look nuts 206 and 288 hold the studs in position.
As shown in FIG. 2, the booms are in a partially ex
tended position. Actuation of motor 78 moves the booms
to the left or right, as desired, with relative movement of
the booms causing boom 42 to telescope outwardly of
boom 40 and the load trolley to move to the left on
boom 42.
vBlock 142 is raised or lowered relative to load trolley
130 through hoist mechanism 286, which includes hoist
cable 144 wound on drum 208 ‘which is in turn driven
by motor 218. When the load engaging block is in a pre
selected position, with or without a load suspended from
hook 150, motor 218 is tie-energized and drum 288 is
relatively movable members to provide synchronized
locked in position with one end of cable 144 wound
movement therebetween and, in the case of the load en
thereon. The opposite end of cable 144 is connected to
gaging mechanism, to maintain hook 158 at a preselected 25 cable anchor 212 on member 28 supporting frame 14.
vertical height during horizontal movement. In FIG. 3
This provides a constant length of cable ‘which is reeved
the various cables are illustrated by dot-dash lines and in
through the relatively movable members, booms and
FIG. 7 the elements ?xed relative to the booms, those
trolley, in such a manner that the vertical position of
movable with boom 40 and those movable with boom 42
block 142 does not vary as the booms and trolley move.
-are designated by full shading, horizontal lines and ver
More particularly, hoist cable sheaves 214, 216 and 228,
tical lines. More particularly, portions 44 and 46 of
222 are carried at the opposed ends of booms 42 and 41%,
boom 44) carry sheaves 152, 154 and 156, 158 adjacent
their opposed ends. Cable 168 is connected at one end
to cable anchor 162 supported ‘from ?xed frame 14 and
extends around sheave 154 to cable anchor 164 connected
to the inner boom 42. Cable 166 also has its ends con
nected to anchors 162 and 164 and extends around sheave
respectively, and cabie 144 extends from drum 288
through sheave 224 carried on frame 14, passes over
sheave 229 on boom 40 and back to sheave 216 on boom
42. From sheave 216 the hoist cable is‘ reeved over
‘sheave 140 on the load trolley, under sheave 148 ‘of the
block and over the other sheave 139 of the trolley. From
152 located at the opposite end of portion 44. A similar
the trolley the hoist cable passes over sheave 214 on boom
arrangement is provided on the opposite side of boom 40
42 and from there over sheave 222 on boom 48 to anchor
at portion 46, where cable 168 has its ends connected to 40 212. Accordingly, block 142 is supported by a constant
cable anchors 170 and 172 and extends around sheave
length of cable which is so reeved through the relatively
158, and cable 174 extends around sheave 156 with its
movable members that cable 144 is simultaneously payed
ends also connected to anchors 178 and 172. With this
out and taken up by the booms and trolley, in accord
arrangement, movement of boom 40 relative to the frame
ance with their synchronized movement, to maintain a
is transmitted through the constant lengths of cable to 45 taut cable without vertical movement of the block. Fur
boom 42 so that inner boom 42, in addition to moving
thermore, such an arrangement permits the hoist motor
with outer boom 40, also moves relative to the outer
to be located remote from the load thereby permitting a
boom. In this manner, driving boom 46) relative to the
relatively light and simply constructed trolley.
frame also produces telescoping movement between the
two booms.
Through a similar cable arrangement the relative move
ment of the booms is utilized to move the load trolley
along the inner booms 42. More particularly, portions
94 and 96 of boom 42 carry sheaves 176, 178 and 180,
182, respectively, at their opposed ends. Cablel184 is
connected at one end to a cable anchor 186 carried on
portion 44 of outer booms 40, is reeved on sheave 176,
threaded through ‘cable guide 187 on the trolley, and
It will be noted that hoist cable ‘144 passes over a limit
switch 226 which provides a slack line control.
More
particularly, the limit switch is included in the circuit of
motor 218 and when the hoist cable goes slack is oper
ative to de-energize the hoist ‘motor and lock the hoist
drum to prevent excessive cable pay out.
It will also be appreciated that suitable mechanical
stops or electrical limit switches could be provided to
limit the upward travel of the block and, correspondingly
the load. An example of an arrangement for providing
passes over sheave 189 to anchor 188 carried on portion
an upper limit on the travel of block 142 is illustrated in
~ 46 of outer boom 40. At the opposite end of inner boom 60 FIGS. 10 and 11 and includes electric limit switch 238
42, cable ‘190 has its ends connected to anchors 186 and
mounted on support frame 14. Actuating lever 232 of
188 and is reeved over sheaves 178 and 182 and is thread
the switch is connected to one end of a messenger cable
ed through cable guide 194 on the trolley. Accordingly,
234 and is reeved generally in a figure 8 on booms 48
constant lengths of cable interconnect the booms and the
and 42. More particularly, cable 234 is reeved over
trolley so that relative movement between the booms,
sheave 236 on boom 48, extends to and over sheave 238
as described above, causes the trolley to travel on boom
on boom 42 and along boom 42 to sheave 248. From
'42, this movement being in addition to the movement of
sheave 248 the messenger cable returns to boom 40 where
the trolley with inner ‘boom 42 relative to the outer
boom.
it is reeved over sheave 242 with its opposite end being
connected to anchor 244 on frame 14. Tension spring
With this cable reeving arrangement synchronized 70 246 is seated between frame 14 and lever 232 and nor
movement occurs between the booms and the trolley uti
mally holds the lever in an unactuated position, the full
lizing only a single drive source, motor 78. Taking for , line position in FIG. 11.
example a driven speed of 10 ‘f.p.m. of boom 48 relative
to the frame, the speeds of boom 42 and the trolley rela
‘Messenger cable 234 passes through load trolley 13%)
where it is threaded through a number ‘of rollers, or
tive to'the vframe'are 20 f.p.m. and 30 f.p.m. The ‘driven 75 sheaves, 248, 25a and 252. Rollers 248 and 252 are sup
3,083,838
5
ported in ?xed relation on the load trolley and roller 250'
is supported for movement relative to the trolley, for ex
ample by means of vertical slot 254 in body 129 which
permits vertical movement of roller 25s, Roller 250 is
positioned in the path of block 142 and if desired lever
256, pivoted from the load trolley, can be provided in
termediate the block and roller 25%.
n
53
to and produces movement of said load trolley relative to
said booms, means for moving said load engaging means
relative to said trolley and including cable means adapted
to have its ends ?xed relative to said booms and said trol
lei, and means supporting said cable means from said
booms and said trolley so that said load engaging means
remains stationary during relative movement of said
booms and said trolley.
Messenger cable 234 is a constant length of cable an
4. The combination of claim 3 wherein said booms
chored at its opposed ends on the frame and reeved over
the telescoping booms so that movement of the booms 10 are arranged in relative telescoping relationship.
5. Load handling apparatus comprising, in combination,
and trolley relative to each other and the frame occurs
a frame, a ?rst elongated boom, means for moving said
without varying the tension on cable 234', i.e. neither
?rst boom relative to said frame, a second boom telescoped
causing slack cable nor increasing the tension on the
with and movable relative to said ?rst boom, ?rst constant
cable. Therefore, when the block has been lowered from
the trolley switch lever 232 is held in an unactuated posi 15 length cable means connected between said frame and said
second boom and supported by said ?rst boom so that
tion and roller 254} is in its down full line position. As
said second boom is moved in accordance with movement
the block is raised into the trolley, roller 25% is engaged
of said ?rst boom, a load trolley supported for movement
and moved upwardly tending to shorten the ?gure 8 loop
with and relative to said booms and including load engag
of cable 234, shortening the loop moves lever 232 to the
right toward its dotted line position to actuate the switch 20 ing means, second constant length cable means engaging
said load trolley and ?xed to said ?rst boom, means sup
and stop hoist motor 21%}. When the block is again low
porting said second cable means from said second boom
ered, spring 246 will return lever 232 to the full line
so that relative movement between said ?rst and second
position and roller 25% also returns to its full line posi
booms moves said load trolley relative to‘said second
tion. It will be appreciated that the hoist line and sheaves
of the trolley have been omitted for clarity and it will 25 boom, hoist means for raising and lowering said load en
gaging means with respect to said load trolley and includ
also be appreciated that rollers 248 and 252 could be
ing a hoist cable adapted to be ?xed at its opposite ends
included as part of sheaves 134 and 14% and roller 25H’?
relative to said booms and said trolley, and means sup
could be directly engaged by block 142 if desired. Still
porting said hoist cable from said booms and said trolley
other arrangements can be incorporated in the crane to
limit the upper travel of the block, however, the arrange 30 so that said load engaging means is held at a preselected
height during relative movement of said booms and said
ment shown is particularly advantageous since it places
the electrical control apparatus at a point remote from
trolley.
6. Load handling apparatus comprising, in combina
tion, a plurality of relatively movable booms, a load trol
or other movable elements, and does so while maintain 35 ley supported for movement with and relative to one of
ing a compact, taut and sensitive control arrangement.
said booms, means for driving one of said booms, means
interconnecting said booms for producing relative move
However, the limit switch, or switches could be mounted
on the load trolley for direct engagement by the block,
ment therebetween in accordance with said driven move:
with the electric lines being of constant length and reeved
ment, and means connecting said load trolley to said
with the booms so as not to run slack or be unduly ten 40 booms and responsive to relative movement between said
ioned during boom and trolley movement.
booms to drive said load trolley relative to said booms.
Although but one embodiment of the present invention
7. Load handling apparatus comprising, in combination,
has been illustrated and described, it will be apparent to
‘a frame, a plurality of relatively movable booms, means
those skilled in the art that various changes and modi?~
for driving one of said booms relative to said frame, a
cations may be made therein without departing from the 45 load trolley supported for movement with and relative
spirit of the invention or from the scope of the appended
to said booms, ?rst constant length cable means connected
between said frame and said booms and supported by
claims,
What I claim is:
said one boom so that movement of said one boom pro
1. Load handling apparatus comprising, in combina
duces relative movement of said booms second constant
tion, a plurality of relatively movable booms, a load trol
length cable means engaging said load trolley, and means
ley supported from and movable relative to one of said
supporting said second length of cable from said booms
the movable member of the crane so as to avoid the prob
lem of running electric lines to the movable load trolley,
booms and including load engaging means, means for
driving one of said booms, means interconnecting said
booms for producing relative movement therebetween in
accordance with said driven movement, and means con
so that relative movement between said booms moves said
load trolley relative to said booms.
8. Load handling apparatus comprising, in combina
55 tion, a frame, a plurality of relatively movable booms,
necting said load engaging means in said load trolley for
sheave means carried at longitudinally spaced Points on
each of said booms, means supporting one of said booms
for movement relative to said frame, means for moving
said one boom relative to said frame, ?rst constant length
load engaging means relatively stationary during said 60 cable means connected between said frame and said booms
movement with and relative to said load trolley, said con
necting means operative to compensate for said relative
movement of said booms and said trolley to hold said
relative movement.
2. The combination of claim 1 wherein said booms are
arranged in telescoping relationship.
3. Load handling apparatus comprising, in combination,
and reeved on the sheave means on said one boom so that
movement of said one boom relative to said frame pro
duces relative movement of said booms, a load trolley
supported for movement with and relative to said booms,
a frame, a plurality of booms supported from said frame 65 and second constant length cable feans engaging said
for movement relative to each other and said frame, a load
lead trolley and reeved on the sheave means of said
trolley including load engaging means, means for support
booms so that relative movement of said booms moves
ing said load trolley from and for movement relative to
said trolley relative to said booms.
one of said booms, means for driving one of said booms
9. The combination of claim 8 wherein said booms are
relative to said frame, means interconnecting said booms
arranged in telescoping relationship.
for transmitting said driven motion therebetween to pro
10. Load handling apparatus comprising, in combina
duce relative movement between said booms in accordance
tion, a frame, a ?rst elongated boom, sheave means car
with said driven movement of said one boom, means inter
ried at longitudinally spaced points on said ?rst boom,
connecting both of said booms and said load trolley so
means for supporting said ?rst boom for movement rela
that said relative movement of said booms is transmitted 75, tive to said frame, means for moving said ?rst boom rela
j
.
tive to said frame, a second elongated boom arranged in
telescoping relation with and movable relative to said ?rst
boom, sheave means carried at longitudinally spaced points
8
second boom, ?rst cable means ?xed to said frame and
said second boom and reeved over said sheave means on
said ?rst boom so that said second boom moves in ac
on said second boom, ?rst constant lengths of cable con
cordance with movement of and relative to said ?rst
nected between said frame and said second boom ‘and 5 boom, a load trolley, means supporting said load trolley
reeved over said sheave means on said ?rst boom so that
from and for movement relative to said second boom,
said second boom moves in accordance with movement of
second cable means ?xed to said ?rst boom and engaging
and relative to said ?rst boom, a load trolley, means sup
said trolley, said second cable means reeved over said
porting said trolley for movement relative to said second
sheave means on said second boom so that relative move
boom, second constant lengths of cable connected to said 10 ment of said ?rst and second booms moves said trolley
?rst boom and engaging said trolley, said second cables
relative to said second boom, and hoist means including
reeved over said sheave means on said second booms and
load engaging means carried by said trolley and a hoist
arranged so that relative movement of said ?rst and second
cable, said hoist means operative to raise and lower said
booms moves said trolley relative to said second boom,
load engaging means relative to said trolley ‘and the
and hoist means including load engaging means carried 15 ends of said cable adapted to be ?xed relative to said
by said trolley and cable means, said hoist means operative
‘booms and said trolley, said hoist cable reeved over
to raise and lower said load engaging means relative to
sheaves on said booms and said trolley so that said load
said trolley and the ends of said cable means adapted to be
engaging means is held at a preselected height during said
?xed relative to said booms and trolley, said cable means
relative movement of said booms and said trolley.
reeved over sheaves on said booms and said trolley so 20
15. The combination of claim 14 including means sen
that said load engaging means is held at a preselected
sitive to the movement of said load engaging means for
height during said relative movement of said booms and
said trolley.
controlling said hoist means and operative to limit upper
travel of said load engaging means.
16. The combination of claimlS wherein said means
11. The combination of claim 10 including means sen
sitive to the movement of said load engaging means ‘and 25 ‘for controlling said hoist means comprises control means
controlling said hoist means in accordance with that move
including means positioned in the path of and arranged
ment, said hoist control means being operative to de~
for engagement by said load engaging means during its
energize said hoist means when said load engaging means
upward travel so that said control means is actuated when
reaches a predetermined height to thereby limit the upper
said load engaging means reaches a predetermined height
30 to’limit the upward travel thereof.
travel thereof.
12. Load handling apparatus comprising, in combina
17. The combination of claim 15 wherein said means
tion, a frame, ‘a ?rst elongated boom, sheave means car
for controlling said hoist means comprises a limit switch
ried at longitudinally spaced points on said ?rst boom,
mounted in ?xed relation to said ?rst and second booms
‘means for supporting said ?rst boom for movement rela
and said load trolley, means positioned in the path of and
tive to said frame, means for moving said ?rst boom rela 35 arranged for engagement with said load engaging means
tive to said frame, a second elongated boom arranged in
during upward travel thereof, and means connecting said
telescoping relation with and movable relative to said
last mentioned means to said limit switch for transmitting
?rst boom, sheave means carried at longitudinally spaced
motion therebetween so that said limit switch is actuated
points on said second boom ?rst constant lengths of cable
when said load engaging means reaches a predetermined
40
connected between said frame and said second boom and
height to limit the upward travel thereof.
reeved over said sheave means on said ?rst boom so that
18. The combination of claim 17 wherein said connect
said second boom moves in accordance with movement
of and relative to said ?rst boom, a load trolley, means
ing means comprises a third constant length of cable con
nected 'at one to said limit switch, at its opposite end to
supporting said load trolley for movement relative to said
said frame, and supported on said booms to accommodate
second boom, and second constant lengths of cable con 45 movement of said booms without varying the tension in
nected to. said ?rst boom and engaging said load trolley,
said second cables reeved over said sheave means on said
said third length of cable.
19. The combination of claim 14 wherein said ?rst and
second boom and arranged so that relative movement of
second booms are arranged in telescoping relationship
said ?rst and second booms moves said load trolley rela
50 with each other and said frame.
tive to said second boom.
13. Load handling apparatus comprising, in combina
20. The combination of claim 19 including control
boom relative to said 'frame, a second elongated boom,
sheave means disposed at longitudinally spaced points on
for movement athwartship, means for driving said boom
athwartship, a second boom carried by said ?rst boom
for movement with and with respect to said ?rst boom,
means for said hoist means engaged by and sensitive to
tion, a frame, a ?rst elongated boom, sheave means dis
the tension in said hoist cable so that ‘when said hoist
posed ‘at longitudinally spaced points on said ?rst boom,
means supporting said ?rst boom from and for move 55 cable goes slack said hoist means is de-energized.
21. In combination, a ?rst boom supported on a ship
ment relative to said ‘frame, means for moving said ?rst
said second boom, ?rst cable means ?xed to said frame
and said second boom and reeved over said sheave means
on said ?rst boom so that said second boom moves in
means responsive to movement of said ?rst boom rela
60 tive to said ship for moving said ?rst and second booms
accordance with movement of and relative to said ?rst
relative to each other, a trolley carried by said second
boom, a load trolley, means supporting said load trolley
from and for movement relative to said second boom, and
boom for movement with and with respect to said second
boom, means responsive to said relative movement of said
second cable means ?xed to said ?rst boom and engaging 65 booms for moving said trolley with respect to said second
boom, load engaging means carried by said trolley, a hoist
said trolley, said second cable means reeved over said
drum mounted in a ?xed location on said ship, and a hoist
sheave means on said second boom so that relative move
cable extending from said drum to said load engaging
ment of said ?rst and second booms moves said trolley
means and reeved over said booms ‘and trolley so that its
relative to said second boom.
14. Load handling apparatus comprising, in combina 70 effective length remains unchanged during movement of
said booms and trolley, whereby said load engaging means
posed at longitudinally spaced points on said ?rst boom,
remains at the same elevation during said boom and trol
means supporting said ?rst boom from and for movement
ley movement.
relative to said frame, means for moving said ?rst boom
22. Load handling apparatus comprising, in combina
tion, a frame, a ?rst elongated boom, sheave means dis
relative to said frame, ‘a second elongated boom,'sheave
means disposed at longitudinally spaced points on said
tion, a ?xed support member, at least one boom sup
ported from and movable relative to said support mem
3,083,838
10
ber, a load trolley supported for movement with and
means, control means connected to said hoist means and
relative to said boom, load engaging means on said load
trolley, hoist means for raising and lowering said load
engaging means, and means sensitive to the movement of
said load engaging means and connected to and control
positioned in ?xed relation to said booms and load trolley
at a point remote therefrom, sensing means disposed in
the path of said load engaging means and connected to
ling said hoist means so that said hoist means is de—
energized when the travel of said load engaging means
reaches a predetermined upper limit.
23. The combination of claim 22 wherein said hoist
control means comprises means for selectively de-ener
gizing said hoist means and including means positioned
in the path of and arranged for engagement by said load
engaging means during its upward travel so that said
said control means for actuating said control means in
‘accordance with movement of said load engaging means
to de-energize said hoist means when said load engaging
means reaches a predetermined height.
26. The combination of claim 25 wherein said con
10 necting means comprises a constant length of cable sup
ported from said booms and said trolley.
27. The combination of claim 26 wherein said control
means comprises an electric limit switch mounted on said
control means is actuated to de-energize said hoist means
?xed support member.
when said load engaging means reaches a predetermined 15
28. In combination, a ?rst boom supported on a ship
height to limit the upward travel thereof.
for movement athwartship, means for driving said boom
24. Load handling apparatus comprising, in combina
athwartship, a second boom carried by said ?rst boom
tion, a ?xed support member, a ?rst boom supported
for movement with and with respect to said ?rst boom,
from and movable relative to said support member, a
means for moving said second boom relative to said ?rst
second boom supported for movement with and relative 20 boom, a trolley carried by said second boom for move
to said ?rst boom, a load trolley supported from one of
ment with and with respect to said second boom, means
said booms for movement with and relative to said
booms, load engaging means supported from said load
trolley, hoist means for raising and lowering said load
for moving said trolley with respect to said second boom,
load engaging means carried by said trolley, a hoist drum
energized when the travel of said load engaging means
so that its effective length remains unchanged during
movement of said booms and trolley, whereby said lead
engaging means, and means sensitive to the movement of 25 mounted in a ?xed location on said ship, and a hoist
cable extending from said drum to said load engaging
said load engaging means and connected to and control
means and reeved through said ?rst and second booms
ling said hoist means so that said hoist means is de
reaches a predetermined upper limit.
25. Load handling apparatus comprising, in combina 30 engaging means remains at the same elevation during
tion, a ?xed support member, a ?rst boom supported
boom and trolley movement.
from and movable relative to said support member, a
References Cited in the ?le of this patent
second boom supported for movement with and relative
to said ?rst boom, a load trolley supported from one of
UNITED STATES PATENTS
said booms for movement with and relative to said booms, 35
Garland ______________ __ Feb. 9, 1954
2,668,625
load engaging means supported from said load trolley,
Grant _______________ __ Apr. 17, 1962
hoist means for raising and lowering said load engaging
3,029,954
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