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Патент USA US2412555

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‘Dec. 17, 1946.
2,412,555
C. E. BAKER
.
PLATE GRAPPLE
Filed Oct. 27, 1943
,
INVENTOR
CHARLES
E. BA'KER
BY
W 71 9M
ATTORNEY
2,412,555
Patented Dec. 17, 1946
UNITED STATES PATENT OFFICE
2,412,555
PLATE GRAPPLE
Charles E. Baker, Oakland, Calif.
Application October 27, 1943, Serial No. 507,807
5 Claims. (61. 294—104)
_
l
The invention relates to a grapple or tongs
adapted for use in gripping relatively large metal
and other plates for their carrying support, from
2?.
opposed block portions i5 and it connected by
an upper block portion and arranged to receive
an edge portion of a plate element or other object
for its releasable gripping therein.
In the present grapple structure, the side of
A general object of the invention is to provide CI
the slot I4 bounding the portion it of the mem
a grapple of the type described which may be
ber 8 provides a jaw face or abutment ii for co
readily attached to and freed from a plate with
operation with a jaw face 13 provided by the
a minimum of manual effort and a maximum of
opposed portion 59 of the member 9 to grip a
safety for an attendant.
plate in the slot i4 whereby the portions 15 and
A more speci?c object is to simply and effi
i9 comprise jaw portions of the members 8 and
ciently accomplish the general object in a novel
9 respectively. In the present structure, the abut
grapple structure which utilizes the hoist line for
ment I? is flat, while the jaw face l8 of the mem
effecting the gripping of a plate by the grapple,
ber S is spirally convex with respect to the piv
or a loading or removed positioning of the grap
a hoist line.
ple, optionally.
Another object is to provide a grapple of the
type described which may automatically release
otal axis of the member in a manner to provide
a ca-mming grip against the withdrawal from the
slot ill of a plate supportedly engaged between
the jaws l5 and 19.
a plate from its grip by and upon the support
The present member 9 extends longitudinally
of the gripped plate by another means.
The invention possesses other objects and fea 20 through a slot 25 provided centrally through the
portion 16 and extending between the slot face
tures of advantage, some of which, with the fore
22 opposite the abutment El and the outer edge
going, will be set forth or be apparent in the
23 of the portion i6‘, except for a side-connect
following description of a typical embodiment
ing part 2r‘; remaining adjacent the free point of
of the invention, and in the accompanying draw
I the portion. The pivot pin ii is engaged trans
ing, in which,
versely through the member 5] and the opposed
Figure 1 is a perspective View showing a pres
parts of the portion 56 de?ning the sides of the
ent grapple as conditioned and positioned for
slot 2i in such a position that, with no plate dis
its mounting on and gripping engagement with
posed in the plate-receiving slot M of the mem
a vertically disposed plate.
Figure 2 is an elevation showing the grapple 30 ber 53, the member Q may be rocked in the slot
2! between limiting positions in which it respec
as conditioned and positioned for its operative
tively engages the abutment H or the part 24 as
engagement with a horizontally disposed plate.
stops. The mem er 9 is understood to constitute
Figure 3 is a side sectional elevation showing
a lever of the ?rst class having its jaw portion
the grapple as conditioned and positioned during
2| comprise one ‘arm, while its other arm 25 ex—
the hanging support of a plate thereby.
03 O! tends beyond the edge 23 for its connection with
Figure 4 is a horizontal view of the grapple
the chain id, as at a transverse terminal eye 25
as conditioned and positioned in Figure 3.
of the arm.
Figure 5 shows a pair of the present grapples
An arm 2? extends rigidly from the end of the
cooperatively applied in the gripping and hang
member 8 opposite the slot it and in transverse
ing support of a plate.
40
relation to the plane of the abutment ll at the
The illustrated grapple l embodying my inven
same side thereof as the member 9, and said arm
tion comprises a pair of support members 8 and
is provided with a terminal eye 28 having its axis
9 hingedly connected at a pivot pin 2 I and opera
preferably intersecting the arc of movement per
tive in a common plane generally as jaws of a
mitted the eye 25 of the member 9 with respect
tongs for the gripping and lifting of a plate ele
to the member 8. A terminal link 29 of the chain
ment 12' through the coaction therewith of a flex
I3 is pivotally engaged through the eye 26 of the
ible hoist line in the form of a chain l3 providing
member ii, and said chain extends through the
a part of the grapple assembly, said hoist line
eye 28 in freely slidable relation thereto where
being arranged for its. control from a crane or
derrick or the like. As particularly shown, the 50 by the present grapple is arranged for suspen
sion from a chain portion above the eye 28 while
support member 8 comprises a block of uniform
the respective jaws i5 and IQ of the members
thickness and of generally elliptical side outline,
8 and 9 grip a load element between them or are
and is provided with a transverse slot Iii extend
mutually engaged when no load element is pres—
ing into it from What may be conveniently called
its lower end whereby the slot l4 bounds‘laterally 55 ent.
3
2,412,555
By reason of the disposition of the operative
hoist line portion between the eye 23 of the sup
port member 8 and the eye 25 of the support
member 9 in spaced and generally parallel rela
tion to the plane of the abutment H, the sus
pended grapple will have, or tend to have, said
abutment oblique :to the vertical whether the
grapple is loaded or not. The general disposition
of a present grapple supporting a plate l2 solely
from one edge is shown in Figure 3, it being noted 10
that the angle oi obliquity of the supported plate,
and the grapple abutment ll engaged by it, is
determined by the fact that the center of gravity
4
either substantially vertical or substantially hori
zontal, and hooks 34 and 35 are provided on the
member 8 at appropriate peripheral points there
of to respectively position the slot M vertical or
horizontal when the grapple is supported from a
chain link in the described manner. Preferably,
and as shown, the hooks 34 and 35 are provided
within the generally elliptical outline of the sup
port member 8, have the‘ planes of their loops dis
posed in the central plane of the member, and
are enough narrower than the member that the
link which engages them need be no wider than
the member.
of the freely hanging plate and grapple assem
In the present grapple structure, all but one
bly is disposed in a vertical plane including the 15
of the links of the chain l3 are relatively short,
hoist line portion above the grapple. Figure 5
and a longer link 36 is provided at such a point
shows a pair of grapples 7 operatively applied
of the chain that it may supportingly engage
and cooperative for supporting a relatively heavy
either
book while the chain extends through the
and wide plate 8 of metal or other material from
eye 23 of the member 8. While the link 35 is
a primary hoist line 3! through a spreader as
20 shown in Figures 1 and 5 as comprising the termi
sembly 32 and the hoist line chains i3 of the
nal link of the chain 13 which engages the
grapples; the line 35 may comprise a wire cable,
spreader 32, it may, of course, comprise an in
as indicated. If but one grapple is needed for
termediate link of the chain is. Also, the link
the line 3!, the chain E3 of a grapple 1 may be
36 is preferably wide enough to prevent its move
directly attached to the line 3! as a continuation
25 ment through the eye 23, and generally comprises
thereof.
an eye on the hoist line.
It will now be noted that the present grapple
It will now be noted that the support axis of
arrangement by which a suspension support of a
the hook 34 is so related to the member 8 that the
loaded grapple from its hoist line disposes, or
link 35 will suspendingly and swingably support
tends to dispose, the load-engaging jaw abut 30 the
grapple assembly below the link to dispose
Inent ll‘ in oblique relation to the vertical, is de
the
plate-receiving
slot ill of the member 8 in a
sirable for insuring and maintaining an ap
plane parallel to that of an upright plate !2 to
propriate grip on a supported plate. But the
same operative arrangement also disposes an un
be engaged at its top; as illustrated in Figure 1,
said plate is in vertical position. When an up
loaded grapple with the plane of its abutment I‘! 35 right plate i2 is to be gripped by a grapple ‘I
even more oblique to the vertical than when the
having the hoist line link 36 supportingly engaged
grapple is loaded, while holding its jaws mutually
with its hook 3d, the line-supported grapple is
engaged, whereby certain practical difficulties are
lowered to receive and rest upon the plate in its
presented during a mounting or dismounting of
the grapple with respect to a plate to be handled, 40 slot l4 while an attendant at the grapple guides
the descending grapple into plate-receiving posi
particularly if the unengaged plate is substan
tion merely by swinging it and/or rotating it about
tially vertical or substantially horizontal as is
the hoist line axis as may be needed. When the
most usual in stockpiles of plates. Accordingly,
grapple rests upon the top plate edge, the hoist
means are provided for facilitating a loading of
a suspended present grapple by so supporting and 45 line is slacked off enough to permit the attend
ant to manually release the link 36 from the
conditioning it that its slot it may freely re
hook 34. A subsequent raising of the hoist line
ceive an edge of a positioned plate to be engaged
ell‘ects a rocking of the camming member 9 with
without involving an otherwise required manual
respect to the member 8 to e?ect a preliminary
twisting of the supported grapple into a plate
gripping of the plate edge between the jaws l5
receiving positioning of the slot ill and a sep
and
I 9, while the continued raising of the line
aration of the grapple jaws i5 and l9 for the
thereafter lifts the grapple and the engaged plate.
engagement of the plate between them; both
It will be noted that the ?nal tightening of the
such manual operations involve certain physical
camming jaw l5 raises the grapple slightly with
efforts and dangers of injury to an attendant for
respect to the plate, the latter being shown in
the grapple. ,
Essentially, the aforesaid means for position 55 Figure 3 which discloses the oblique positioning
of the fully suspended plate l2.
ing and conditioning a suspended present grapple
When the present grapple is to be used for lift
for freely receiving a plate for its gripping and
ing a plate l2 supported in prone position with
lifting comprises the provision of special hoist
an edge portion free for its gripping by the
line connections for a suspension of the grapple
assembly in appropriate position directly through 60 grapple, the grapple may be suspended by its hook
35 from the hoist line link 36 and with its slot
the support member 8 while the member 9 is left
it opposite said plate edge portion as is shown
free for a relative opening of the jaws. In the
in Figure 2. It will be understood that the posi
present instance. such a positioning support of
the grapple structure is arranged to be e?ected 65 tion of the hook 35 on the member 3 is such that
the slot H3 is horizontal when the grapple as
from the chain it, and to that end, hooks are
sembly below the link 35 is supported from said
provided at appropriate points of the periphery
link by the hook. Having the slot i4 positioned
of the member 8 for selective engagement by a
opposite the plate edge, an appropriate lateral
link of the chain beyond the arm 25 of the mem
movement
of the hoist line and/or its manual
ber 9 while the chain portion between the engaged
link and said arm 25 is slack and the chain por 70 swinging may engage the plate edge in the slot,
after which a slacking off of the hoist line to
tion at and above the engaged link comprises, or
provide for the support of the grapple on the
‘5 part of, a hoist line.
upper plate side permits a release of the link
The present grapple has been particularly de
from
the hook 35. A lifting on the hoist line
signed for engagement with plates which are
then operates the member 9 to grip and lift the
2,412,555
5
plate. If the horizontal plate is engaged by one
6
marily illustrative, and that such indicated and
other changes may be made, when desired, as fall
within the scope of the following claims.
or more grapples ‘I solely along one edge there
of, the plate. when lifted clear, will assume the
I claim:
‘
general position shown in Figure 3. On the other
1. In a plate-lifting grapple or the like for sup
hand, if a grapple l is- simultaneously rendered
port from a hoist line. a unitary support member
operative at an opposite edge part of the plate,
providing an abutment against which a plate to
the plate may be lifted while supported in hori
be lifted may be pressed and providing an eye
zontal position. In any case, the hoist line pro—
spaced from the plane of the abutment having its
vides the gripping action of a grapple while a plate
10 plane transverse to the abutment plane, a second
is supported thereby.
support member pivoted to the ?rst member at a
When a present grapple ‘I is supported by the
point thereof opposite the abutment and compris
direct connection of the member 8 to the hoist
ing a lever-providing a head for plate-gripping
line, as at the hooks 34 or 35, the hoist line por
coaction with the abutment and providing an op
tion between the connection and lever arm 25 is
erating arm arranged for its connection to a hoist
slack to permit a rocking of the member 9 to dis
line extending slidably through the eye for e?ect
pose its jaw out of the slot Ill; under the condi
ing a gripping and support by the grapple assem
tions of Figure 1, the hoist chain portion below
bly of a plate or the like disposed between the
the link 36 automatically accomplishes the latter
abutment and head thereof upon a tensing and
by gravity. Also, when a gripped plate l2 which
has been supported by a present grapple, or 20 raising of the line, and plural hoist line connec
tion means provided by the first member in fixed
grapples, in upright position, is set down edgewise
relation thereto for selective'use and so located on
upon an underlying support, the resulting upward
the member that the unloaded grapple supported
movement of the plate in the slot 14 releases the
on a hoist line from said connection means will
cam grip of the grapple jaw 19 and permits a
have its abutment disposed in the same angular
gravity cam-release rocking of the member 9
relation to the vertical as that of a plate to be
to inoperative position, both by reason of its own
gripped and lifted by the grapple, support of the
form and the weight of the hoist chain portion
unloaded grapple from the different said means
then supported by it.
being arranged to dispose the abutment in mutu
When a plate which has been supported hori
zontally is set down in horizontal position, the 30 ally di?erent relations to the vertical.
2. In a plate-lifting grapple or the like for sup
slacking off of the hoist line permits a manual
port from a hoist line, a unitary support member
release of the camming jaw [9 to allow the man
providing an abutment against which a plate to
ual pushing or hoist line swinging of the grapple
be lifted may be pressed and providing an eye
laterally from the plate. While the hoist line is
spaced from the plane of the abutment, a second
still slack with respect to the grapple, the link
support member pivoted to the ?rst member and
36 would be reengaged with the appropriate hook
providing a camming head for plate-gripping co
34 or 35 whereby a subsequent raising of the
action with the abutment. an arm connected with
hoist line will lift the freed grapple in position
the camming head member for actuating the
and condition for its gripping engagement with
iii) same and arranged for its connection to a hoist
the. next plate to be handled.
line extending slidably through the eye for effect
Noting that the use of a common hoist line for
ing a gripping and support by the grapple assem
supporting the present grapple in position and
bly of a plate disposed between the abutment and
condition for its loading and in its plate-carrying
camming head upon a tensing and raising of the
condition is generally preferable for minimizing
line, and means on the ?rst member providing a
the amount of equipment needed, it will be un
plurality of hoist line connections at different
derstood that separate hoist lines might be pro
points of the member for effecting the direct
vided for alternatively supporting the grapple in
support of the unloaded grapple assembly from a
the different said conditions. The latter ar
selected said connection point, support of the un
rangement would, of course, require the provision
of two separate hoist line mounts and controls 50 loaded grapple from the different said points be
ing arranged to dispose the abutment in mutually
with the derrick or crane utilizing a present grap
different relations to the vertical.
ple. but would eliminate any requirement for
3. In a plate-lifting grapple, a unitary support
manually making or breaking the connections
member providing an abutwent against which a
for the lines for the different manners of support
55 plate to be lifted may be grippedly pressed and
ing the grapple.
an eye spaced from the plane of the abutment, a
In view of the foregoing description and dis
second support member hinged to the ?rst at a
cussion respecting the manipulation of the pres
point thereof opposite the abutment and compris
grappie during and preparatory to its use, it
ing a lever providing an operating arm and a
will be understood that the required manual han
dling of the grapple assembly, which may Weigh 60 head for plate-gripping coaction with the abut
ment, ?exible hoist line comprising a link chain
ninety pounds more or less, in mounting and
extending from the arm of the second member
and slidably through said eye of the ?rst member
for effecting a gripping and support of a plate
minimum risk of personal injury, particularly
since all usually required operations are per 65 engaged between the abutment and head upon
its ten'sing and raising, and a hook on the mem
formed While the hoist line is slack.
her for engaging a link of the hoist line for the
From the foregoing description, taken in con
lifting and releasing a load require a minimum
of muscular effort by an attendant and involve a
skilled in the art to which the invention apper
tains. While I have described the features and
support from the hoist line of the unloaded grap
ple independently of the second member and to
dispose the abutment of the line-supported grap
ple in a different and predetermined angular re
lation to the vertical than that assumed by the
use of an arrangement which I now consider to be
abutment while the suspended grapple supports
a preferred embodiment of my invention, I de
a plate.
nection with the accompanying drawing, the ad_
vantages of the construction and use of the pres
ent grapple will be readily understood by those
sire to have it understood that the showing is pri
4. In a plate-lifting grapple or the like, a uni
2,412,555.
7
tary support ‘member providing an abutment
against which a plate to be lifted may be gripped
ly pressed and providing an eye spaced from the
plane of the abutment, a second support mem
ber pivoted to the ?rst and providing a camming
head for plate-gripping coaction With the abut
ment. an arm connected with the camming head
member for actuating the same, a hoist line com
prising a link chain extending from the arm and
slidably through the eye for e?‘ecting a gripping
and support by the grapple assembly of a plate
disposed between the abutment and camming
head upon a tensing and raising of the line, and a
hook on the ?rst member engageable with a link
of the hoist line to directly and releasably con
nect the member and line for the support of the
grapple from the line independently of the sec
ond member, support of the unloaded grapple by
the hoist line from the second member or from
said connections on the ?rst member being‘ar
ranged to dispose the abutment in mutually dif
ferent relations to the vertical.
5. .In a plate-lifting grapple or the like for sup
8
port from a hoist line, a unitary support member
providing an abutment against which a plate to
be lifted may be pressed and providing an eye
spaced from the plane of the abutment, a secondv
5 support member pivoted to the ?rst member and c
providing a camming head for plate-gripping 00
action with the abutment, an arm connected with
the camming head member for actuating the
same and arranged for its connection to a hoist
line extending slidably through the eye for effect
ing a gripping and support by the grapple assem
bly of a plate disposed between the abutment and
eamming head upon a tensing and raising of the
line, and means on the ?rst member providing a
hoist line connection at a ?xed point of the mem
ber for effecting the direct support of the unload
ed grapple assembly from said connection point,
support of the unloaded grapple from said con
nection point being arranged to dispose the abut
20 ment in a different relation to the vertical than
that assumed by it when the grapple is supported
through the second member.
CHARLES E. BAKER.
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