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Патент USA US2405338

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Aug. 6, 1946.
‘Filed May 23, 1944
.9 A
6/91; w/v J. wee/YE»?
Patented Aug. 6, {$46
Calvin J. Werner, Dayton, Ohio, assignor to Gene
eral Motors Corporation, Detroit, Mich., a cor
poration of Delaware
Application May 23, 1944, Serial
1 Claim.
(01. 74—291)
This invention relates to an improved load sup
porting device having an electric motor as prime
mover andv provided with a manually operated
member adapted to act as a secondary driving
has a housing or frame. 21 secured to one end of
the gear housing 22.‘ The armature 23 of the elec
tric motor 2i] has a shaft 24 journalled in the
bearing .25 and in turn having‘the cup-shaped
Referring to the drawing, the electric motor 20
It is among the objects of thepresent invention
driving disc 26 secured thereto so as to rotate
to provide a load supporting device with a single
therewith. . Disc 26 has an outwardly extending
n'iember whose normal function is to render the
device adaptable to be driven at a reduced speed
cles the driving disc 23 and is secured in the motor
by an electric motor,.said single member also be
annular fiangeZl. A magnet winding 28 encir
10 frame 2| insuch a manner as to magnetize the
ing adapted to be manually operated to actuate
driving disc when energized.
the device independently of the motor.
The gear housing 22‘ has a partition wall 29
Further objects and advantages of the present
provided with an opening‘ 30 coaxial with the ar
invention will be apparent from the following de»
mature shaft 24. A roller bearing ,3l is supported
scription, reference being had to the accompany 15 in opening 30, said bearing carrying a stub shaft
ing drawing, wherein a preferred embodiment of
comprising a hub portion 32 journalled in hear
the present invention is clearly shown.
ing 3|, a counter-balance weight portion 33, an
In the drawing:
eccentrichub portion 34v and a hub portion 35
Fig. l is a fragmentary, sectional View of the
coaxial with the opposite end hub portion 32.
load supporting device.
20 Two roller bearings 36. and 31 are carried by
Fig. 2 is a transverse section taken along the
the eccentric hub portion 34 of the stub shaft,
line 2—2 of Fig. 1, parts of the mechanism being
said bearings, in turn, supporting the double,
shown in elevation for the sake of. clarity.
epicycloidal' gear member which provides the
The device illustrated in the present drawing
one spur gear 38 and the second andsmaller spur
is somewhat similar to the device disclosed in 25 gear 39.
my copending application, Serial ,No. 468,475,
An annular ring gear 40 is supported inv housing
?led December 10, 1942, Patent #2,383,901 and
22 by two ball bearings 4| and 42. Annular ring
is adapted for the same use. Like the device of
gear 49 has gear teeth 43 provided in its outer
annular surface and also gear teeth 44 provided
comprises a screw shaft upon which is mounted 30 in its inner annular surface.
a traveling nut which supports the load.
The teeth of the epicycloidal spur gear 38 mesh
The screw shaft is connected with the shift
with the inner gear teeth 44 of the annular. ring
able member or armature of an electro-magneticv
gear 40. The teeth of the epicycloidal-spur gear
clutch by a train of speed reducing gearing. Nor
39 mesh with. the teeth of the inner annular ring
mally, when the device is not operating, the shift
gear 45 which is journalled in the tWo ball bear
able member or armature is urged into gripping
ings .416 and 47' carried in housing 22. The pitch
engagement with a brake ring which holds the
diameters and the number .of gear teeth. in the
screw shaft against rotation.
two ‘cooperating gears 38 and the one consisting
A magnetizable driving disc is operatively con
of teeth 44 are of a predetermined» relativity as
nected to the shaft of the prime mover, ‘an electric
are the gears 39 and 45‘ so that a certain speed
motor. ‘The electromagnetic clutch has a magnet
reduction is obtained, as ‘will be described.
winding encircling the driving disc to energize‘ it
Ring gear 45: has. a central opening which is
when the said winding is energized so that the
interiorly threaded to receive the threaded end
armature is moved from the brake ring and into
of the tubular screw shaft 50. Keys 5| immova
the copending application, the present device
operative engagement with the driving disc.
The magnet winding is energized concurrently
with the energization of the electric motor so
that as the motor operates the driving disc, the
bly secure the ring gear 45 to the screw shaft. A
ball bearing 52 'is carried in the end of the
tubular screw shaft 50 and supports the portion
35 of the stub shaft.
armature, operatively engaging said disc, will act
Excepting threaded end portions, the outer sur
through the speed reducing gearing to operate the 50 face of screw shaft or tube 50 is provided with a
.screw shaft.
The load supporting nut on the
screw shaft is held against rotation and there
fore rotation of the screw shaft will, cause ‘the
nut to move longitudinally on the said. shaft. to,
shift its load.
continuous helical groove 55 which corresponds
with a helical groove56 formed in the interior
surface of-~ the traveling nut 51. These two coin
ciding, helical grooves form a helical passage in
5.5 which the balls 58, which operatively connect
and 52, the eccentric portion 34 thereof, upon
~ ‘the nut to the shaft, may traveL, This feature
is identical to that disclosed in my copending ap
which are mounted the epicycloidal gears 38 and
plication referred to heretofore. The nut 51 pro
39, joined in one member, will revolve said gears
vides trunnions 59 to which the load supporting
about, its orbit. The gear 38, meshing with the
arm or lever, not shown, may be attached. A 5 interior teeth 44 of the annular gear 40, which
?anged member 60, also secured to the nut, pro
is being held against rotation by the worm gear
vides an anchorage for the innerv ends of ‘two col
lapsible dust shield-sleeves BI and 62-, the outer,
19, will consequently be rotated about the stub
shaft bearings 36 and 31 and thus the joined gear
end of thesleeve 6| being secured to the gear
housing 22 in any suitable manner while the outer
end of sleeve 62 is attached to member 63 which in
turn is supported by the end collar 64 threaded,‘
and secured to the lower or outer end of the screw
39 ‘will'be rotated therewith. Gear 39 meshes
with the internal annular gear 45 and thus will
rotate said gear 45 which is secured to the
' . screw shaft 59.
When the nut 51, which supports the load by
means of 'trunnions 59, is at one end of the screw
In order that the epicycl'oidal speed reduction 15 shaft 59, for instance at its upper end as illus
gearing may operate, it is necessary to hold the
annular gear 49 against rotation. For this pur
trated'in 'Fig. Land the screw shaft is rotated
l, in the :properdirection, the nut, held against ro
pose worm gear 19 is provided, meshing with
tation, will travel downwardly toward the screw
the outer gear teeth 43 of the annular ' gear 49.
cap 64 on the outer end of the screw shaft, thus
lowering the load. A reverse rotation of the
screw shaft causes the nut to move upwardly
Worm gear ‘I9 is formed’on or secured to a shaft
'H- which is journalled’ball bearings 12 and 13
along said shaft» to lift the load on its trunnions
59. One shield sleeve will be collapsed while the
other is expanded due to the travel of the nut.
From the aforegoing it will be seen that the
annular gear 49 must be held against rotation
in order to render the reduction gearing effective
to transmit the rotative motion of the motor
driving disc 26 to the screw shaft 50. The worm
carried in a cylindrically shaped extension"!!!
on» the housing-22. >A su?icientportion of one
end of shaft 1| extends outside the housing 22 to
permit’ attachmentof 'any suitable manually op
erable actuator, notshown.
1. “Theend .ofethe portion-7320f the stub shaft,
journalled-in- the ball bearing 3i extends beyond
said bearing and is serrated or'channelled to re
ceive a similarly serrated or channelled arma
ture disc 89 whereby said armature disc is splined
to said stub shaft so as to rotate therewith, yet
be slidable longitudinally thereon,
N This end of the stub shaft or more speci?cally
its portion 32 is centrally recessed to receive the ‘
retainer cup 8| inwardly ?anged at itsinner end
and outwardly ?anged-to rest upon the bottom
surface -of. acentralirecess provided in the ar
mature disc 30. A headed screw stud 82 is pro
vided in the recess of- the stub shaft portion 32
anda coil spring 83 surrounds the screw stud,
one end of the spring rests upon the inward
?angeat: the lower end, of the retainer cup 81
whilevthe other or upper-end of the spring en
gages the head of the screw stud 82. This spring ~'
83. lexerts pressure upon.the retainer cup_8l so as
to ‘urge the armature ,disc 89,‘ engaged by the
upper ?ange of said cup, into gripping engage
mentiwith the brake ring 99 secured to the parti
tion 29 in the housing 22 thereby preventing ro
tationof the stub shaftwhich is operatively con
nected to the screw shaft .50 through the reduc
,, When the/armature disc isin, normal gripping
engagement with the brake ring 90 .it is spaced
from the, driving disc ?ange 2'Ipso as to. provide
the proper air gap therebetween which may be
traversed by the magnetic ?ux to attract the ar
mature disc, 89 and move it into gripping, opera
tive_engagement with» said driving disc 28 when
19 is so eonstructedand arranged‘ that its en
gagement with the exterior teeth 43 of the. an
nular gear 4|] will hold said gear against rota
tion and cannot be rotated in turn by said an
nular gear. However, rotation of the worm gear
will-rotate the annular gear 49. Thus the worm
gear, a single element, acts in one instance to
hold the annular gear against rotation and in
another instance to actuate theannular gear by
rotating it.
If for any reason the electric‘ motor is rendered
inoperative, manually ‘actuated apparatus, con
nected to shaft 1!" of the worm gear 19 may be
used to rotate said worm gear and thereby rotate
the'annular gear 49 engaged by it. ' As the an
nular gear ‘49 is so rotated it, in turn, ‘will rotate
the spur gear 38 about the‘ bearings 36 and 31 on
the eccentric portion '84 of‘ the now stationary
stub shaft held against rotation by the brake 99.
The gear 39, joined to gear 38, will rotate there
with on saidstub shaft and will, in turn, rotate
the annular gear 45 with which it meshes and
thus the screw shaft 59, joined to gear 55, will
be rotated manually and independently of the
electric motor." Under these circumstances the
motor armature 23; the driving disc 26, the arma
ture disc 89 and the stub shaft consisting of por
tions 32, 33,34 and 35.:donot rotate, in fact all
are inactive excepting, the stub shaft eccentric
portion 34 ‘which acts merely as a stationary
spindle about which the member providing the
the electromagnet winding 28 is energized.
;, Energization of ithe‘electromagnet winding 28
is concurrent with energization of the electric
spur gears 38 and39 rotates.
motorq29, thus as soon as the motor starts to
supporting device having amember 10 in the
rotate the driving disc “is magnetized, causing
form of a worm gear which normally acts to ren
it toiattract the armature disc 89 and move it
from engagement} with the brakev ring 99 into
operative, gripping engagement with the ?ange
portion 21 of said driving disc. Now the arma
ture disct? willirotate with the driving disc 26
and, due to the fact that said, armature disc 80
is splined to the stub, Shaft, portion 32, the stub
shaft will consequently berotated withsaid disc
._ 'Astne stilt ‘shaft, is; rotated in itspearings 31'
the present invention provides a load
der the device adaptable to be driven at a re
duced speed by an electric ‘motor and ‘which, un-.
der certain circumstances, may itself ‘be man
ually actuated to operate the device tolperform
70 its functions independently of the electric motor.
While the embodiment of the present invention
as herein disclosed constitutes a preferred form,
it is to be understood that other formsimight be
adopted, all coming withinthe scope ofthe claim
which follows.
What is claimed is as follows:
end being journalled in the main housing, said
A unitary load supporting and moving device
stub shaft having an eccentric, intermediate por
comprising a main housing and a secondary hous
ing supported on the main housing; of a shaft
tion upon which a unitary, double epicyclic gear
journalled in the wall of the main housing and
is journalled, said gear engaging and intercon
necting the two ring gears; a collar secured to
having a worm gear the teeth of which extend
the main housing and holding the sub-assembly
into the main housing; asu-b-assembly insertable
as such into the main housing, said sub-assembly
comprising an outer shell, bearings in said shell
rotatably supporting two internally toothed ring
in the main housing; a friction ring secured in
the main housing; an armature disc slidably
keyed to the stub shaft and normally urged into
braking engagement with the friction ring; a
stator in the secondary housing, an armature
having a shaft journalled in the secondary hous
ing and having a driving disc secured to the shaft
of the armature; and a magnet coil in the sec
gears, one of which has outer, peripheral teeth
engaged by the teeth of the worm gear, the other
ring gear having a screw shaft attached thereto
upon which a load supporting and moving nut is
threadedly mounted, a stub shaft, one end of
which is journalled in the screw shaft, the other
ondary housing about the driving disc.
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