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Патент USA US3046056

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July 24, 1962
c. 0. GRIS
3,046,046
MOTOR ACTUATED ROTARY CRANE HOOK
Filed Dec. 22, 1958
FIG. 3
INVENTO/P
CONRAD D. GP/S
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tates
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3,ii4é,®46
MOTOR ACTUATED ROTARY CRANE HGOK
Conrad D. Gris, Hamilton, ()utario, Canada, assignor to
Mansaver Industries, Inc, New Haven, Conn, a cor
poration of Connecticut
Filed Dec. 22, 1958, Ser. No. 782,179
6 Claims. (Cl. 294—82)
3,045,046
Patented July 24, 1962
2
away, of two gear and pinion crane hook arrangements
constructed in accordance with my invention, and
FIG. 3 is a similar view showing the alternative arrange
ment wherein the gear wheel and pinion is eliminated.
The arrangement shown in FIGS. 1 and 2 follows
standard practice in comprising an upper member 2
adapted to be hung fromv the lifting cable assembly of a
crane and a lower member 3 carrying a hook 4 and
This invention relates to improvements in rotatable
crane hooks which depend from the lifting cables ‘of cranes
or the like and upon which the load to be lifted is hung,
the crane hooks in general consisting of an upper member
attached to the lifting element of the crane and a lower
hook member swivelly attached to the upper member and
swivelly attached to the upper member, and whereby a
load hanging from the hook 4 may be rotated through the
medium of the swivel connection between the members
2 and 3.
In the construction shown in FIG. 1, the shank 5 of
the upper member carries a freely rotatable gear wheel 6
whereby the suspended load may be manually rotated by
concentric to the vertical axis of the assembly, being of
15
workmen to any desired position.
bell shape and mounted upon the lower face of a balance
In the case of light duty cranes lifting small loads the
wheel 7 carried for free rotation upon the shank 5 which
turning of the load can be accomplished by a workman
has an increased diameter lower portion 8 upon which the
‘7 _ pulling or pushing the load and in which case the swivel
wheel rests. The upper end 9 of the member 3 is of
connection between the upper member and the lower hook
socket form to embrace a head 10 carried upon the bot
member generally turns without undue twisting of the 20 tom of the shank 5 to constitute a swivel connection and
load carrying cable. However, in the case of heavy duty
which incorporates a thrust bearing 11. The lower mem
cranes for lifting massive loads an entirely diiferent con
dition is presented as the mass of the load very frequently
produces a su?icient compressive thrust in the swivel con
ber 3 carries a suitable seat 12 for the reception of an elec
tric motor 13 of suitable drive shaft speed, a pinion 14
the crane.
direction of rotation of the hook 4. The mass and diam
eter of the balance wheel 7 is so proportioned in relation
being mounted upon the shaft and meshing with the gear
nection to bind the swivel against free turning and whereby 25 wheel 6.
great manual force has to be exerted and which twists the
The foregoing described assembly is so proportioned in
load carrying cable to a point where its resistance to fur
size and weight that rotation of the pinion 14 by the
ther twisting is su?icient to overcome the binding of the
motor 13 causes the pinion to rotate around the gear
swivel connection; all of which is time consuming and
wheel 6 and turn the hook, however as the gear wheel 6
dangerous for those people pushing or pulling the load as 30 is freely rotatable upon the shank it also rotates under
well as being injurious to the load suspension assembly of
the action of the pinion in the opposite direction to the
The object of this invention is to provide power means
for rotating the lower portion of a crane hook in relation
to its upper portion and to preferably do so by the use of
an electric motor carried by the crane hook.
A particular object of the invention is to incorporate a
gear wheel and a meshing pinion in the crane hook as
to the gearing and the driven speed of the pinion 14 that
the hook 4 will only slowly rotate when carrying a load
and will stop rotating under relatively small applied re
sistance to the turning movement of the load by a work
man.
sembly, the gear wheel being rotatable in relation to the
In the arrangement illustrated -in FIG. 2, a balance
crane hook and positioned substantially concentrically of 40 wheel 15 is freely caried upon the shank 5 of the upper
the vertical axis about which the hook is turnable, the
member in a similar manner to the mounting of the bal
pinion being supported by either the upper portion or
ance wheel 7 ‘and carries a pair of electric motors 16
lower hook portion of the crane hook and driven by an
seated within diametrically oppositely positioned ori?ces
electric motor carried by the crane hook; by which ar
17 in the wheel. The upper end 18 of the lower member
rangement energization of the motor causes the pinion to 45 3 is of socket form to embrace a head 19 carried upon
tend to travel around the gear wheel and also to tend to
the bottom of the shank 5 to constitute a swivel connection
rotate the gear wheel in an epicyclic arrangement and
and incorporating a thrust bearing 20‘. The ‘upper periph
whereby readily controlled power rotation of the lower
eral portion of the socket 18 carries a concentric gear
portion of the crane hook in relation to the upper portion 50 wheel '21 with which mesh a pair of pinions 22 carried
of the crane hook is effected.
and driven by the motors 16.
A further object of the invention is to provide an alter
As will be readily perceived, the epicyc-lic operation of
native arrangement wherein the gear wheel and pinion is
the FIG. 2 arrangement is the same as that of the FIG. 1
eliminated, and in which arrangement an electric motor is
arrangement, ‘but in this case the hook 4 will turn with the
positioned concentrically of the vertical axis about which 55 gear wheel 21 from which it depends; the mass and
the hook is turnable, the shaft of the motor upon which
diameter of the balance wheel 15 and its contained motors
the motor rotor is mounted being swivelly connected at its
16 being proportioned in relation to the gearing and the
upper end to the upper portion of the crane hook and
driven speed of the pinions 22.
formed with the hook upon its lower end, the armature
In the alternative construction shown in FIG. 3 and
containing motor casing being freely mounted upon the
60 electric motor is positioned concentrically of the vertical
motor shaft to surround the rotor and carrying a weighted
axis about which the hook 23 is turnable, such hook being
rim concentric wheel which is attached thereto; and by
carried upon the lower end of the shaft 24 of the motor.
which arrangement energization of the motor rotates the
The upper end of the shaft carries a head 25 which is
rotor and hook in one direction and the armature casing
encased within a socket 26 formed upon the bottom of
and wheel in the opposite direction and whereby readily
the upper member 27, the head resting upon a suitable
65
controlled power rotation of the hook is effected.
thrust bearing 28. The motor rotor 29 is secured upon
With the foregoing and other objects in view as shall
the shaft 24 and contained within the armature housing
hereinafter appear my invention consists of a power driven
rotatable crane hook constructed and arranged all as here
inafter more particularly described and illustrated in the
accompanying drawing in which:
FIGS. 1 and 2 are side elevational views, partly broken
30 which is mounted for free rotation and rests upon a
thrust bearing 31 carried by the motor shaft. A balance
70 wheel 32 is mounted upon the armature housing to give it
su?icient inertia against initial free spinning, when the
motor is energized.
3,046,046
From the foregoing desciption it will be understood, as
the rotor and armature are both rotatably mounted, that
A33
ed from the upper member in rotatable relation thereto,
a balance Wheel rotatably mounted about said upper
energization of the motor will tend to rotate the arma
ture and rotor in opposite directions, so that a load hang
member, motor means and means driven by said motor
means and connecting said balance wheel to said lower
rotor and the hook or perhaps retain the rotor at a stand
said lower hook member.
4. A load carrying rotatable crane hook assembly com
prising, an upper member, a lower hook member suspend
ing from the hook 23 will only permit slow rotation of the UK member for epicyclically controlling the movement of
still while the armature and balance Wheel 3'2 spins. In
either case it is a simple matter for a workman to retard
ed from the upper member in rotatable relation thereto,
rotation of ‘the load or if necessary give it a slight assist
in rotation.
10 a balance wheel rotatably munted about said lower hook
member, motor means and means driven by said motor
While electric motors have been shown and described
means and connecting said balance Wheel to said lower
as the power sources, it will ‘be appreciated that other
member for epicyclically controlling the movement of said
sources of power, such as gasoline motors, compressed air
lower member.
motors etc., may be incorporated in the crane hook assem
5. A load carrying rotatable crane hook assembly com
blies and be within the scope of this invention.
15
prising, an upper member, a lower hook member sus—
Having thus disclosed the invention it is to‘ be under
pended from the upper member in rotatable relation there
stood that I do not necessarily con?ne myself to the
to, motor means including a rotor and a stator, a balance
particular embodiments as shown and described, and I
wheel rotatably mounted about said lower hook member,
may make any such changes and alterations as I may
deem necessary without departing from the spirit of the V20 said rotor being secured to said lower hook member and
said stator being secured to said balance Wheel, whereby
invention as set forth in the appended claims.
energization of said motor means tends to rotate said
What I claim as my invention is:
lower hook member and said balance wheel in epicyclic
l.' A load carrying rotatable crane hook assembly com~
prising an upper member adapted for attachment to a
crane, a lower hook member suspended from the upper
member in rotatable relation thereto, a balance wheel
rotatably mounted upon said upper member and motor
means mounted upon said lower member and means driven
by said motor means for rotating said balance wheel and
relation.
6. A load carrying rotatable crane hook assembly com
prising, an upper member, a lower hook member sus
pended from the upper member in rotatable relation
thereto, a balance wheel rotatably mounted ‘about said
upper member, motor ‘means mounted upon said balance
wheel and means driven by said motor means and con
epicyclically controlling the movement of said lower
necting said balance wheel to said lower hook member
hook member.
2. A load carrying rotatable crane hook assembly com
prising an upper member adapted for attachment to a
for epicyclically controlling the movement of said lower
hook member.
crane, a lower hook member suspended from the upper
member in rotatable relation thereto, a balance wheel 35
References Cited in the ?le of this patent
rotatably mounted upon said upper member and an
UNITED STATES PATENTS
electric motor carried by said lower member for epicyclic
ally controlling the movement of said lower hook mem
ber with respect to said balance wheel.
3. A load carrying rotatable crane hook assembly com
prising, an upper member, a lower hook member suspend
to
1,577,283
Mitchell ______________ __ Mar. 16, 1926
2,447,343
2,524,189
2,823,944
Kelly _______________ __ Aug. 17, 1948
Clay ________________ __ Oct. 3, 1950
Anderson et al _________ __ Feb. 18, 1958
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