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DQQ 31, 1946-
G. E. MOORE ETAL
GRIP LIFTER
Filed Dec. 28, 1944
2,413,366
\
4 Sheets-Sheet 1
_‘ INVENTORS
George E Moore and
Q1! 5. Mill‘?
Dec- 31, 1946-
G.‘ E.‘ MOORE ETAL
2,413,356
GRIP LIFTER
Filed Dec. 28‘, I944
_4 Sheets-Sheet 2
BY
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5%Ema“?
Gear‘
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- Patented Dec._3l,' 1‘946._ .
r 2,413,366
umrso .srArss PATENT OFFICE‘.
Miller, North Muskegon, Mich., assignors to
Manning, Maxwell ‘J; Moore, Inc, Bridgeport,
Coma, a corporation of New Jersey
.
'
Application‘ December 2.8, 1944; Serial No. 570,047
I " 5Claims. {crass-11c)
.
1
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This invention relates to weight actuated gr1l>~
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portion > Hi having, as illustrated, a central longi
ping devices by means of which heavy objects; '
tudinal passage H therethrough of cylindrical
‘such as plates, sheets, bars, and the like, may be
' lifted and moved about.
..
The lifter comprises a plate-like main body
cross-sectional shape and a pair of downwardly
divergent elongated slots i2 symmetrically dis-_
.
An object of this invention is to provide a
strong, rugged device of this type in which the
gripping forces are exerted by the load being
lifted and are magni?ed by a compound leverage
posed on opposite sides of the central axis. This
element of the devicemay' be termed the~jaw r
guide. The fulcrum rod clearly disclosed in Fig
ure 3 is of T-shaped formation in which the ap
system to insure a firm grasp thereon.
.
Another object of this invention is to provide 16 ertured portion It forms the head and the por
tion it of cylindrical cross-section forms the stem.
in a weight actuated grip lifter a latching device
A series of transverse serrations forming the teeth '
_ 'which looks the gripping laws in gripping posi
I! are formed in the stem It to provide the rack
tion and holds them from releasing the object
bar of the latching device, as will‘ be described
should the gripping device be relieved of the
weight thereof as, for example, by engagement 15
of the object with some resting surface.
A more detailed object of the invention is to
provide a latching structure which may be easily
released upon a conscious act of the operator.
A still further object 'of the invention is to pro .20
vide an improved grip lifting device in which the
gripping laws are detachably mounted for easy
in more detail below.
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The fulcrum rod lies between two pairs-of jaw
levers II and It the relationship of‘ which with
respect to the jaw, guide II will be clearest from
Figure 4. The jaw lever pairs are pivotally
mounted on the fulcrum rod by means of pivot
pins l1 and II and the jaw, levers are preferably
provided at these pivotal supports with thickened
hub orbushing portions I! and 20. The bearings
‘for the pivot pins i1 and It as thus formed are
.- An important object of this invention is to pro
' vide anlimproved form of gripping Jaw especially 25 preferably provided with some suitable form of
adapted to manufacturing processing in the mak- . lubricating device such as the grease gun fixtures
ing thereof.
38. The stem ll of the fulcrum rod lies in the
Other and more detailed oblects of this invené 5
passage ll, asis clear from Figure 2. ~The upper
tion will be apparent from the following disclo
ends of the jaw lever- pairs i5 and It are provided
sure of one embodiment thereof given for illus 30' with apertures to receive the roller pins 2| and 21
trative purposes with no intention of being lim
on which are rotatably mounted the rollers .23 and
ited to the speci?c form illustrated but rather
' 24, respectively, which operate in the guide and
by the scope of the appended claims interpreted
actuating slots II in the main support II. The‘
in the light of established legal precedence.
rollers are lubricated by means of the grease gun
This invention resides substantially in the com
?xtures in communicating with passages in the
removal for repair and replacement.
,
bination. construction, arrangement and relative
location of parts as will be described in detail
below.
.
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In the accompanying drawings-
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Figure l is a side elevational view of one to
of the grip lifting device embodying the subject
matter of the invention. herein disclosed;
.
_
Figure 2 is a cross-sectional view taken on the
line 2-2 of Figure l with a portion broken away;
Figure 3 is a side elevational view of a part
comprising the fulcrum rod;
'
‘
Figure 4 is a top plan view of the device with
some parts removed; -
35 respective pins, as is clear in Figure 4.
v
Mounted in the upper end of the support 10
and extending transversely thereof is a pivot pin
25 on which is locked the hook shackle 26 by
40 means of a collar 2i pinned to the shaft 25 by
means of a locking pin 28.
.
_
The circular recess is formed in one face of the
support It) in transverse alignment with the‘ pas- '
sage‘ II, as will be seen from Figure‘ 2, in which
45 is welded or otherwise secured a circular plate or
disc 29 having a pair of parallel wings to on
' "which is pivotaily mounted,- by means of a pivot
'
pin 3|, the latch lever 32. The pivot pin 3| may '
be secured in place in any suitable manner, as, for
omitted showing a locking device for the latch;
example. by means of snap retaining rings best
Figure 6 is a cross-sectional view taken ‘on the 50 shown in Figure 4 at Ila. The upper end of the
line 8-8 of Figure 5;
.
latch lever 32 is provided with a head or manual ,
Figure 7 is a plan view of a modi?ed form of
33 having a recess therein in which one end of
locking device showing but a very small portion
a
compression spring 34 is seated by means of a
1 the grip lifter; and
‘ Figure. 51s a detail broken view with some parts
Figure 8 is'a cross-sectional view taken on the 55 buttonjl' having a cylindrical engaging face.
The other end of the spring is seated in a recess
a
' I
‘line 8-8 of Figure 'I.
2,418,866
in theadjacent wall of the support “I. The lower
end of the latch lever 32 is provided with a plu
rality of teeth 25 which may cooperate with the
teeth 36 on the stem ll of the fulcrum rod
through aligned apertures in the plate 29 and the
adjacent wall of the support Ill.v The wingslll
4
,
the greater the load imposed upon the device the
greater the gripping action thereof on the load.
As the support ill moves with respect to the
lever pairs l5 and i6, it will be seen that the teeth
of the rack bar 36 move downwardly with respect
to the cooperating teeth 35 on the latch bar 32.
These teeth are held in engagement by the action
of the compression spring 34-‘ on the upper end
and latch lever 32 are provided with apertures
32' which may be aligned when the latch lever
is in retracted position through which a pin may
be passed to put the latching mechanism out of 10 of the latch lever 32 so that each increment of
relative movement is accumulated. so to speak.
use should conditions warrant.
~
with the result that the parts are locked in maxi
~ Lying in suitably shaped open sided aligned re
cesses in the gripping lever pairs l5 and ii are
the generally cylindrical gripping jaws 31 which
mum gripping relation. Should the plate being
lifted by the device come to rest on any surface
so that a portion or all of the load on the gripping
are locked therein by meansv of ‘nuts and bolts 15
device is removed, the gripping force exerted by
.38. These gripping jaws can be easily removed
by removing the nuts and bolts 38 for replace
ment and repair. Since the gripping jaws 31 are
cylindrical they are locked in the lever pairs by
the device is not relaxed because the latching
lever holds the parts in the maximum position
to which they have been extended. When it is
desired to release the plate from the device, the
the bolt 33 which lies in a longitudinal semicir 20 manual 33 is pushed to break the engaging rela
cular groove of the surface of each gripping jaw
tion between the sets of teeth 35 and 38 to re
and in semicircular openings in the lever pairs l5
lease the device so that it can be removed.
and I 6, as can be gathered from a study of Figure
In order to avoid any dimculties in removing
2. The ends of the gripping jaws 31 are cut away,
the grip lifter from an object after the latch
as shown in the drawings, so that the nuts there 25 has been released and to hold the gripping jaws
on will lie substantially ?ush with the ends of
in open position until the grip lifter has been
the gripping jaws to protect them and, of course,
properly applied to the object to be lifted, a lock
will contact the outer faces of the lever pairs i5
ing attachment for the latch lever may be pro
and I 6, as is clear in Figure 2. The exposed facing
vided. Two forms of such an attachment are
areas of the gripping jaws 31 are provided with 30 illustrated in Figures 5 to 8, inclusive. In the
longitudinally extending grooves to form teeth or
form of Figures 5 and 6, it will be seen that a
projections to insure non-slipping engagement
small button 50 of elongated shape, as shown,
with the object to be lifted.
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>
An important feature of the invention is the
form of the gripping jaws to facilitate their
manufacture. As is well known in this art, these
gripping jaws are of hardened steel and it has
been found that by making them of circular
cross-section as shown that they may be more
is pivotally mounted on a screw 5| mounted in
the main body plate or support in of the lifter.
A spring 52 is interposed between the screw 5i
and the button 50 to offer frictional resistance
to the rotation thereof. As is clear from Figure
5, in the full line position the button 50 projects
' under the head or manual 33 of the latching
readily machined to final form and hardened to 40 lever 32 preventing it from moving in a position
the desired temper with a minimum'tendency to
' to disengage the ratchet teeth 36 on the stem H
develop fractures, ?ssures,- or other points of
of the fulcrum rod. With this arrangement it
weakness such as are incident to the hardening
will be seen that when the jaws are moved to full
of angularly shaped pieces.
.
open position, as shown in Figure 1, the latching
While the operation of the device may be clear 45 lever 32 may be retained in engaging position by
from the foregoing description, a brief explana
rotating the button 50 so that it will project under
tion of its action in use will round out this dis
the end 33 of the latching lever. With this ar
closure. Devices of this type used for lifting
rangement the gripping jaws cannot close as they
heavy loads are usually used with-a crane, hoist,
would tend to do due to their own weight. This
or other heavy duty lifting mechanism. The hook 50 facilitates positioning the grip lifter on the object
shackle 26 is, therefore, engaged on the hook of
to be lifted with the jaws open. When in position,
the crane or hoist and lowered'down over the edge
button 50 may be turned to the dotted position
of a plate, for example, to be lifted. The noses
shown in Figure 5 and the latching lever then
of the lever arm pairs 1 5 and I6 are rounded so as
manually released if it does not rclease itself so
to be caused to move apart as they engage the 55 as to permit the grip levers' l5 and I6 to move
top edge of the plate in the event they are not _
into gripping position. Of course, the button 50
su?iciently spaced to receive the plate. The sep
could be used for a similar purpose after the load
arating action of the plate will cause rotation of
is lifted but it has no real utility then because
these levers on the pivot pins l1 and I8 so that
the load itself insures adequate gripping action.
the gripping jaws 31 separate and the device may 60
A modi?ed arrangement is shown in Figures 7
be lowered until the upper edge of the plate en
and 8 in which case a suitably shaped strap 53
gages the exposed edge of the head I3 of the
is attached to the support in by means of screws,
fulcrum rod. The crane is then reversed in its
as shown, in the position of the button 50 of the
direction of movement so that the full weight of
previous modi?cation. Slidably mounted in the
the device is 'taken by the hook shackle. There
strap is a U-shaped latching bar 54 which is fric
results a relative movement between the lever
tionally resisted in movement by means of a
pairs i5 and i6 and attached parts of the sup
spring 55 attached to the strap 53 by means of a
port it], as a result of which the upper ends of
rivet. As will be clear, in Figure 8, the latching
the lever pairs l5 and I6 separate forcing the
bar 54 is in a position to cooperate with the head
lower ends towards each other and moving the
33 of the latching lever and is merely pushed up
gripping jaws 31 into gripping engagement with
wardly to its other position to move it out of co
the sides of the plate lying therebetween. As the
operative relationship with the latching lever.
device begins to pick up the load, this gripping
Thus the structure of Figures 7 and 8 is capable
action is increased and magni?ed by the com
of performing the same functions as that shown
pound leverage system of the structure so that 75 in Figures 5 and 6.
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2,418,868
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From the above description it will be apparent
to those skilled in the art that the subject matter
of the invention is capable of embodiment in
other physical forms. We desire, therefore, that
the disclosure be taken purely in an illustrative
3. In a grip lifting device, thecombination
comprising a body member having a pair of
divergent camming faces and a longitudinal pas
sage therein, a fulcrum rod slidably mounted in
said pas-sage, a pair of levers pivotally mounted,
‘intermediate their ends, on said fulcrum rod,
sense.
What is claimed is:
1. In a grip lifting device, the combination
comprising a body member having a pair of
divergent camming faces and a longitudinal pas
sage therein, a fulcrum rod slidably mounted in
said passage, a pair of levers pivotally mounted,
cam followers mounted on the levers at one end of
each and engaging said camming faces, removable _ ..
gripping jaws mounted on the levers at the other
end of each in opposed relation, a locking lever
pivotally mounted on said member and project
ing through an aperture in the wall thereof open
‘ing into said passage, teeth formed on said ful
intermediate their ends, on said fulcrum rod, cam
crum rod for locking cooperation with said lock
followers mounted on the levers at one end of
each and engaging said camming faces, remov 15 ing lever, a spring for biasing said locking lever
in locking position, and a movable button
able gripping jaws mounted on the levers at the
mounted on said support for movement under
other end of each in opposed relation, a latching
the end of the locking lever to prevent its move
lever pivotally ‘mounted on said body member
ment in unlocking direction.
and cooperating with said fulcrum rod to .lock
it in any position it assumes in said passage, a 20
spring for biasing said locking lever in looking
position, and means for preventing movement of
the latching lever in unlatching direction.
2. In a grip lifting device, the combination
comprising a body member having a pair of
mounted on said members in opposition and com
prising substantially cylindrical members having
roughened faces and lying in recesses in said
members so as to expose the roughened faces,
said gripping jaws having recessed ends and bolts
passing through said members adjacent said jaws
divergent camming faces and a longitudinal pas
sage therein, a fulcrum rod slidabiy mounted in
said passage, a pair of levers pivotally mounted,
so that the heads of the bolts lie in the recesses »
intermediate'their ends, on said fulcrum rod, cam '
followers mounted on the levers at one end of
each and engaging said caming faces, removable
gripping jaws mounted on the levers at the other
end of each in opposed relation, a locking lever
pivotally mounted on said member and project
ing through an aperture in the wall thereof open
ing into said passage, teeth formed on said ful
crum rod for locking cooperation with said look
ing lever, and a shiftable member positionable
under the locking lever to prevent disengagement
with the teeth of the fulcrum rod.
4. In a gripping device having a pair of mov- I
able gripping members, removable gripping jaws
at one end of each jaw, and nuts threadedly en
gaging said bolts and lying in the recesses at the
other ends of said jaws, the heads of the bolts
and the nuts lying at least flush with the ends’
of the jaws.
5. In the combination of claim 4, said jaws
and members having substantially semicircular
aligned longitudinal grooves in which said bolts
lie.
GEORGE E. MOORE.
‘CARL E. MILLER.
40
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