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Патент USA US2120383

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I June 14, 1938.
C(WATSON
2,120,383
PULLEY
Filed Sept. 4, 1936
2 Sheets-Sheet 1
June 14, 1938.
H. c. WATSON
2,120,383
PULLEY
Filed Sept. '4, 1936
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2 Shpets-Sheet 2
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M , INVENTOR.
Patented June 14, 1938
2,120,383
UNITED STATES PATENT OFFICE
2,120,383
PULLEY
Harry C. Watson, Chicago, 111., assignor to Amer
ican Electric Fusion Corporation, Chicago, 111.,
a corporation of Illinois
Application September 4, 1936, Serial No. 99,413 '
(Cl. 74-23mm
5 Claims.
This invention relates to a novel and im
proved form of pulley, the novel features of which
will be best understood from the following de
scription and the annexed drawings, in which I
5 have shown a selected embodiment of the inven
tion and in which:
Fig. 1 is a longitudinal section through a shaft
having a pulley applied thereto;
_
Fig. 2 is a section approximately on the line
10 2—2 of Fig. 1;
Fig. 3 is a view corresponding to Fig. 1 but
showing the parts in different positions;
Fig. 4 is a section approximately on the line
4-4 of Fig. 3;
15
_
oted between its ends.
The pivot I5 for each
lever is shown as being on an ear I6, and one end
of the lever contacts with a bearing I‘! on the‘
?ange I0, while the other end bears against one
end of the key 5.
_
'
_
The two ?anges are normally urged together
by means of a compression spring I8, and there
fore a belt I9 which may run over the pulley will
be driven thereby or may drive the pulley, as the
case may be, and may occupy some such position 10
as shown in Figs. 1 and 2. Assuming, however,
that for any reason at all the tension on the belt
increases, then the two ?anges 9 and II) will be
moved in opposite directions away from each
Fig. 5 is a perspective view of one of the keys
other. The two lever ams of. each lever I4 are 15
equal so that, as the ?ange III moves towards the i‘
Fig. 6 is a section approximately on the line v right, that movement will impart an equal move
6-6 of Fig. 1.
ment in the opposite direction to the keys 5,
The invention is shown as being used in con , which in turn will force the ?ange '9 to the left
20 nection with a shaft I which may be secured to against the action of the spring I8. If, for any
a motor shaft 2, as in the copending application reason, the tension on the belt increases, then 20
of Edmund J. von Henke, Ser. No. 99,219, ?led these movements will be reversed so that the two
September 3, 1936. The two shafts I and 2 are ?anges will be moved towards each other by equal
keyed together at 3 so that they are‘ in effect one
appearing in the other ?gures;
amounts.
25
shaft.
.
The shaft I is shown as being provided with
two diametrically opposed keyways l in which
slide keys 5, the construction of which will prob
ably be best understood from Fig. 5. Each one
so of these keys may slide freely lengthwise of the
shaft, but rotates therewith and is provided with
a circumferentially extending key 6 adapted to be
received in a circumferential groove 1 in the hub
8 of one ?ange 9 of the pulley, whereby the ?ange
35 9 will move with the key 5 lengthwise of the
shaft.
‘
'
~
‘
'
'
'
By the above arrangement, it will be seen that '
'
'
the belt I9 is always maintained in the same po
sition lengthwise of the shaft. This is important
where, for example, the pulley is used to drive
‘some piece of machinery and where a displace-,
ment of the belt lengthwise of the shaft would
not be accompanied by a like displacement of the -
belt along. the driven shaft. In other words, the
belt is always maintained in line, no matter what
may be the driving diameter ofv the pulley. The
diameter of the pulley may vary between that
shown in Fig. 1 and that shown in Fig. 3, but the
Cooperating with the ?ange 9 is a separate
?ange III which together form the pulley, ‘and
belt always occupies the same position as meas
both ?anges 9 and II] are keyed to the shaft to
40 rotate therewith by means of the keys 5, as
plainly shown in Figs. 2 and 4. The two ?anges
are provided with recesses, forming between
them overlapping teeth II and I2, each of which
in a speci?c form, it is to be understood that var
ious changes in details may be made without de
is adapted to enter a recess on the other ?ange.
45 These teeth also may be used, if desired, to cause
ured lengthwise of the shaft.
I
While I have shown the invention as embodied ‘
parting from the scope of the invention, as de
?ned by the appended claims.
IcIaim:
-
.
1. In combinatiom?a shaft having a key mov
the two ?anges to'rotate together, although ordi
able lengthwise thereof, a pulley on said shaft and
narily the keyed connections to‘ the shaft de
formed of two separate ?anges, means causing
scribed above will be su?icient and therefore I said ?anges to rotate together, one of said ?anges
_
have shown in the drawings that the teeth I I and " being movable with said key and the second mov
50 I2 are not in engagement. However, the over
able with respect to the key lengthwise of the
lapping relation of these teeth will permit the shaft, and means actuated by movement of said
two ?anges to be brought close together, as seen second ?ange lengthwise of the shaft, to cause
Lin Fig. 1.
,
movement of the key and the ?rst-named ?ange
Secured to the shaft I is a collar I3 having in the opposite direction.
»
55 pivoted thereon a plurality of levers I4, each piv
' 2. In combination, a shaft, a pulley on said
2
2,120,388
shaft and formed of two separate ?anges, a key
slidable lengthwise of said shaft, a circumferen
tial key connecting said slidable key and one~ of
said ?anges, a lever engaged by the second ?ange
and adapted, upon movement of said second ?ange
away from the first-named ?ange, to move said
slidable key and said ?rst-named ?ange an equal
amount in the opposite direction, and means
yieldingly resisting said movements.
10
therewith, a circumferential key connecting said
slidable key and one of ' said ?anges, a lever en
gaged by the second ?ange \and adapted, upon
movement of said second ?ange away from the
?rst-named ?ange, to move said slidable key and
said first-named ?ange an equal amount in the
opposite direction, a spring'resisting said move
ments, and means causing said ?anges to rotate
in unison with each other.
_
3. In combination, a shaft, a pulley on said shaft
5. In combination, a shaft, a pulley on‘said 10
shaft and comprising two separate ?anges each
and formed of two separate ?anges, a key slid
able lengthwise of said shaft but rotatable there
keyed to the shaft to rotate therewith but movable
with, a circumferential key connecting said slid
axially thereof, means yieldingly urging said
able key and one of said ?anges, a lever engaged ?anges towards each other, a collar secured to
15 by the second ?ange and adapted, upon movement _ said shaft adjacent one of said ?anges, a lever 15
of said second ?ange away from the ?rst-named pivoted midway of its ends on said collar and hav
?ange, to move said slidable key and said ?rst-' ing one end engaging said adjacent-?ange, and
named ?ange an equal amount in the opposite a key slidable along said shaft and connected to
direction, and‘ means yieldingly resisting said the other ?ange and engaging the other end of
20 movements.
said lever, whereby movement of said adjacent 20
4. In combination, a shaft, a pulley on said ?ange away from the other ?ange causes an
shaft and formed of two separate ?anges, a key equal and opposite movement of said other ?ange.
slidable lengthwise of‘ said shaft but rotatable
_
'
I
HARRY C. WATSON.
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