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O)ct.22,1946.
'
A. MEYER
'
'
‘
"2,409,881
SNUBBER FOR HOISTS
Filed Aug. 5. 1943
'
H 19
INVENTOR
)‘M/DREK/
BY
‘
MEYER,
‘ ,
_ ATTORNEY
'
,
‘
2,409,881
Patented Oct. 22', 1946
UNITED STATE s PATENT OFFICE
2,409,881.
SNUBBER FQR Hors'rs “
Andrew Meyer, Cleveland Heights, Ohio, assignor
to The Cleveland ‘Pneumatic Tool Company,
Cleveland, Ohio, a corporation of Ohio
Application August 5, 1943, Serial'No. 497,425
8 Claims.
1
(Cl. _192-4)
2
1 This invention relates generally to winding ap
paratus or hoists and, more particularly, aims
to provide novel snubbing or braking ‘means for a
spective brake drums 2| and encircle, or par
tially encircle, such brake drums. The friction
device or snubber 22, in this instance, comprises
winding drum to prevent backlash and tangling
ofthe cable being wound thereon.‘
Another object of ‘my invention is to provide
a brake band‘ 22a having ‘a- friction lining 22b
for cooperation with the surface of the brake
novel snubbing means ‘for a winding drum or
drum 2|. One end of the brake band 22a is an
chored to the frame H as by means of the bolt
the like, which is automatically applied upon the
‘release of the means controlling the winding op
eration.
23.
‘
/
through a movable snubber-actuating member 25
and through a guide opening in a stationary por
tion 26 of the frame H.‘ The lower portion of the
plied for‘ preventing backlash, is automatically
trolling the winding operation and is automati
cally reapplied upon release of the said brake
means.
The other end of the brake band 22a is
10 connected with an eye-bolt 24. which extends
A further object of this invention to provide
improved winding apparatus wherein a friction
snubber, which is normally or continuously ap
released upon actuation of the brake means con
,
vices or snubbers 22 are associated with the re
eye-bolt 24 carries ‘a compression spring 21 which
= is ‘disposed between the nut 28 and the frame
portion 26 and acts on the eye-bolt so as to con
tinuously exert a pull on the brake band 22a, tend
ing to apply the snubber to the brake drum 2|.
The action of the spring 21 on the brake band
‘
The invention may be further brie?y summa
rized as consisting in certain novel combinations
‘22acan be varied or adjusted by means of a
and arrangements of parts hereinafter described
and particularly set out in the appended claims.
In the accompanying sheet of drawings,
‘cam 29 is'in the~position shown in Fig. 2, the
cam 29 having an actuating-lever 30." When the
spring 2‘! is fully effective in pulling the brake
band against the brake drum 2|. When the cam
‘ Fig. 1 is a side elevation of winding apparatus
25 'is
embodying my invention; ‘
moved to the position shown in Fig. 5, by swing
ing the lever ‘30 downwardly, the eye-bolt 24 is
Fig. 2 is a transverse sectional view taken
through the apparatus on line 2-—2 of Fig. 1;
Fig. 3 is a partial side elevation of the appa
ratus, on a larger scale, showing the interconnec
tion between the friction devices of adjacent 30
brake band, leaving the cable drum free to turn.
The cable may then be unwound manually as is
desirable in setting ‘up the apparatus for each
drums, that is between the control brake band
new
and the snubber band;
7
lifted to relieve the effect of the spring 21 on the
job.
‘
‘
The hoist I0 is provided adjacent each of‘ the
brake drums 2| with a planet gear drum 32 which
r
Fig. 4 is a partial vertical sectional view taken
on line 4—4 of Fig. 2 and showing the‘ actuating
functions as a brake drum and is rotatable on
connection for the snubbing means, and
35 the shaft‘ |‘|. Al'friction device 33 is associated
“ Fig. 5 is a partial1 transverse sectional view
" with each of ‘the, drums 32 and ‘encircles, or par
showing the tension adjustment for the snub
;tially encircles, the same. Each drum 32 carries
bing
means.
‘
“
l
i
More detailed reference will now be made to
one or more spindles 34 on which the‘planet
‘ gears 35, usually employed in hoists‘ of this kind,
the drawing in which I show a hoist ll] having 4.0 _are rotatably mounted. As shown in Fig. 2, each
_my novel snubbing means embodied therein. The
_of the brake drums 2| has an internal ‘gear or
hoist comprises, in general, a frame || having
ring‘ gear 36 therein which is connected with a
thereon a driving motor l2 and a pair of rotatable
winding drums l3.‘ The frame || includes a plu
drive billion 31 of the shaft II by means of the '
with this shaft through a hydraulic coupling l8,150
.spinidles'34 to‘ti‘ansmit torque from the pinion
planet gears 35. When the winding drum I3 is to
jrality of upright longitudinally spaced bearings
supports |4, I5 and IS, in which a drive shaft 45] be rotated, the drum 32 is retarded or held sta
1, tionary by the friction device 33 and this prevents
‘ll-(see Fig. 2) is suitably journaled. The wind
the planet gears 35 from revolving aboutthe
ing ‘drums H are suitably journaled for rotation
‘.pinion‘ 3'1 and causes them to rotate‘ on their
about the shaft l1 and the motor |2 is connected
and areduction gear I9‘;
‘
The remote ends of the winding drums l3 have
brake drums 2| bolted thereto, or otherwise con
nected therewith, so that such brake drums rotate
to the ring gear 36. The‘ resulting rotation of
the ring gear 36 causes rotation of the brake drum
2| and the winding drum I3 connected thereto.
.When the winding drum I3 is to be slowed or
with the respective winding drums. Friction de-t 55 stopped, the drum 32 is released ,and permitted
2,409,881
4
to rotate, at which time the gears 35 travel idly
said one drum, and a friction device associated
with the second drum to retard rotation thereof
and adapted to be released in response to said
limited movement of the ?rst friction device.
2. In apparatus of the character described, a
around the shaft IT.
The friction devices 33 associated with the re
spective drums 32 each comprises a band, or the
like, 39 having suitable friction lining or shoes
for cooperation with the drum surfaces and hav
ing ends 39a and 3% adapted to be drawn to
gether by the .lever 43 and link 4| when the fric
tion devices 33 areto be applied to the brake
drum 32. The friction devices 33 are disposed
pair of adjacent rotatable drums, friction devices
associated with the respective drums, one of said
friction devices being normally applied, to it drum
and the other being normally released from its
drum, means for applying said other friction de
vice, and means energized by drum movement for
automatically releasing said one friction device
in response to the application of said other fric
around the drums 32 so that these devices are ca
pable of limited circumferential shifting with
their drums when the friction devices are applied
or‘tightened against the surfaces of the drums.
This limited shifting of the friction :deVices
.
tion device and leaving said one friction device
free to resume its normal applied position in re
sponse to the release of said other friction device.
3. In apparatus of the character described, a
is utilized in actuating the snubbers '22. To ‘this
end the friction devices 33 have the snubber actu
pair of adjacent rotatable drums, friction devices
ating members 25 connected therewith.
associated with the respective drums, a spring
The snubbers 22 are normally applied or held
in frictional engagement with their respective 20 acting to apply one of‘ said‘ friction devices to its
brakewdrums 2i vso as to hold, the ‘winding drums
drum to retard rotation thereof, means operable
against unintentional or excessive rotation which
to apply theother friction device to its drum,said
other friction device when set to grip its drum
would cause backlash or tangling of the cable.
‘being-capable of limited shifting with its drum,
Whenoneofthe winding drums I3 is to be ro
tated, the leverilil is actuated to apply the fric 25 and means carried by said other friction device
and adapted to cooperate with said one friction
tionwjdevicetti to the‘ drum 32 to retard -or_ stop
the rlatten;v As explained ‘above, this results in
‘device to release the same in opposition to said
spring in response to said limited shifting.
the winding drum being driven ‘from the shaft
1'! through thegears I35, 36 and‘ 37. When the
4. In an apparatus‘ of the character described,
friction device 33 is ‘tightened against the drum 30 a pair of adjacent rotatable drums, friction .de
vices comprising brake bands associated with
.32,- it is immediately carried or shifted circum
said =clrums, portions. of said brake bands being
‘ferentially by that drum ‘and such movement is
transmitted ‘by the member 25 to the active'end
of the snubber 2-2 in a “direction to compress the
.movable-inopposite directions to grip .the respec
tive ‘drurnaiand a direct connection‘be'tween said
spring 121 and release the snubber from its brake 35 portions energized by ‘drum movement for auto
matically relieving the gripping action of one
drum 21.. .{I’he release of the snubber 22 permits
the Winding ‘drum 13 to be freely driven for the
device when the other device is caused to grip
desired "winding operation. When the winding
its drum.
7
‘
5. In an apparatus of ‘the character described,
Sdrum 5113 is to be stopped,- the lever_'4_0 -is swung
vinthe opposite direction to release the friction 40 a “pair vofadjacent rotatable drums, friction de
:device; 133', whereupon, thespring 21 immediately
vices ‘comprising brake ‘bands . associated with said
applies or tightens'the snubber 22 against the
drums, portionsIof said brake ‘bands being mov
able in'opposite'directions to grip the respective
brake g.drum.;j2l qto prevent overrunning of the
winding drum which would cause backlash ‘and
drums, means for causing one oflsaid devices to
tangling of the cable. :In ‘addition to applying 45 grip its drum, and a direct connection between
the snubber 22 against its brake drum, the spring
said portions energized-by drum movement ‘for
21:’.- alsoiacts through vthe member 25 to return
automatically relieving the gripping action of the
other device when the ?rst device is caused to
the ‘friction’ device 1,373 to its initial position.
, It willibe seen from the foregoing description
grip its Idrum.
and the accompanying-drawing that I have pro-‘ 50 I ?alfn a hoist of the character ‘described, a
vided an improved winding apparatus or hoistin
rotatable windingdrum having-a brake drum con
which a snubber for the winding drum is auto
nected therewith, a snubberia'ssociated with the
;matically releasedupon actuation of the friction
(brake drum, Imeans ‘for establishing a driving
l-device- “controlling :thelwinding operation andIis
connection with said winding drum including a
automatically reapplied uponrr'elease of said fric 55 second rotatable brake drum andIa friction de
tion device, ,»It<.wi1l be seen also that this auto-'
vice associated with theflatter which whenap
matic snubbing action .is obtained through the
*useof simpli?ed .apparatusutilizing the cir
cumferential ‘shifting of the frictiondevice ‘3.3,
for, actuating the snubber. '
v
I . 'Wh'il'e'fhave- illustrated and described my im
proved ‘ winding apparatus and .novel ‘snubbing
.means in morejor less ‘detaiLJit will be understood
plied to the drum is movable therewith to 'a lim
ited extent, means operable to applyor' release
said friction device, and means for automatically
releasing and reapplyingjsaid snubber in response
to ‘the movementsaof said friction device follow
its application to or release fromsaidlsecond
drum.
I
I
,
v.
‘In a ‘hoist of the character described, a
of course'tliat‘ld‘o not wish tolbe correspondingly
I‘l'iin‘ited but regard my. invention‘ as vincluding "all. 65'rotatable winding drum having a brake drum
‘connected therewith, -a snubber associated’Ilwith
changes and modifications coming ‘within the
spirit er" the invention] and the scope o'fthe ap
- "the brake drum andxnormally applied thereto ‘to
prevent overrunning ‘of the winding'drum,--means
forestablishing .a driving connection ~with_._saicl
"I. ‘Inapparatus' "of ‘the character described‘, a 70 ‘winding-drum including a second rotatable brake
drum and a friction device associated with the
paircf .adiacentrotatable drums, afriction device
latter which when applied to the drum is vmov
"associated with *one of said ‘drums and adapted
pended claims. ‘ ,
I IIIjIaving" ‘thus described‘.myjinvention,‘ I ‘claim:
able therewithto a limited extent, .means oper
‘to be applied thereto to 'ret'ard'irotation'ofsaid
able to apply-or release saidfriction-device.for
‘one‘drum, said friction'device when set to grip
"its-drum beingcapable of limited-movement with 75‘. controlling said - driving connection, and; means
2,409,881
5
interconnecting said friction device with said
snubber for automatically releasing the latter in
the ?rst brake drum applied thereto, means for
temporarily applying the other friction device
response to the application of said friction de
for retarding the second drum and causing said
vice.
?rst brake drum to be driven through said gears,
8. An apparatus of the character described,
the last mentioned friction device being capable
two rotatable brake drums, a drive shaft extend
of limited shifting with its drum when applied
ing into said drums and carrying a pinion, a
thereto, and means responsive to such shifting of
ring gear carried by the ?rst brake drum, a planet
said last mentioned friction device for automati
gear carried by the second brake drum and dis
cally releasing the friction device of the ?rst
posed between said pinion and ring gear, friction 10 brake drum.
devices associated with the respective drums,
ANDREW MEYER.
means normally holding the friction device of
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