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Патент USA US2119550

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June 7, 11938.
M. H. LOUGHRlDGE
2,119,550
SPEED CONTROL AND BRAKING SYSTEM
Filed July 19, 1934
5 Sheets-Sheet 1
June 7, 1938-
M. H. LOUGHRIDGE
2,119,550
SPEED CONTROLrAND BRAKING SYSTEM
Filed July 19, 1934
5 Sheets-Sheet 2
ww.
1N VENTOR.
June 7, 1938.
M. H. LOUGgHRlDGE
-
2,119,550
SPEED CONTROL AND BRAKING SYSTEM
Filed July 19, 1934
Ai?ié
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IYNVENTOR.
June 7, 1938.
M. H. LOUG'HRlDGE
SPEED CONTROL AND BRAKING SYSTEM
Filed July 19, 1934
2,119,550
4
5 Sheets-Sheet 4
“E99 in?” " %MW “ET”?
June 7, 1938. -
M. H. LOUGHRjD-GE
2,119,550
SPEED CONTROL AND BRAKING SYSTEM
Filed July 19, 1934
5 Sheets-Sheet 5
:5..
'
Patented June 7, 1938
7 2,119,550
UNITED STATES PATENT orrics
2,119,550
SPEED CONTROL AND BRAKING SYSTEM.
Matthew H. Loughridge, Bogota, N. J.
‘ Application July 19, 1934, Serial No. 736,052
42 Claims.
(Cl. 188-180)
This invention relates to braking systems and _ anism shown in Fig. 1, showing how the braking
to speed control systems, and it has for an ob
ject to provide a braking or retarding effect when
a predetermined speed is exceeded. A further
5 object of the invention is to obtain speed con
trol by a differential mechanism which is oper
ated in part by the driving mechanism. Another
object of the invention is to provide a band
brake for a brake drum with self-adjusting fea
10 tures to provide for misalignment between the
axis of the brake drum and the ?xed end of the
brake band. A further object of the invention
is to provide a differential mechanism for speed
control purposes which is operated by but which
15 is not incorporated in the main driving mem
bers. Other objects of the invention are more
fully set forth in the following speci?cation de
scribing one form of the system and its mode
of operation and which will be particularly
20 understood from the accompanying drawings, in
which:
,
Fig. 1 is a plan View of the speed control
mechanism from the top as applied to a revolving
door mechanism;
2
Fig. 2 is a side elevation from the right of the .
5 mechanism shown in Fig. 1;
.
Fig. 3 is a sectional elevation on line 3—3 of
Fig. 1 showing the internal construction of the
differential mechanism and the brake drum;
30
7
Fig. 4 is a detail in elevation showing the sup
port for the brake band and the method for
applying tension thereto;
Fig. 5 is an elevation of a link used in Fig. 4
taken at right angles to Fig. 4 from the left;
Fig. 6 is another detail of the end connection
35
for the brake band and the method of applying
tension, thereto;
a suitable base.
for the brake band;
'
- Fig. 9 is a side elevation of the self centering
bracket shown in Fig. 8 for supporting the brake
band;
-
-
This invention embodies the features of the
differential brake described in U., S. Patent 5
1,805,551, May 19, 1931, U. S. Patent 2,010,027,
August 6, 1935 and U. S. Patent 2,037,034, April
14, 1935. In the above patent the brakes are
controlled by a differential mechanism operated,
by a difference in speed between the driving and 10'
driven parts. In the present application'a dif
ferential mechanism is used to control the brakes,
but the brake application is made effective only
when a predetermined speed is exceeded. This
result is obtained by operatively connecting one
member of the differential mechanismv with a re
tarding device which permits a comparatively
free movement of this member belowthe pre
determinedspeed, and on the other hand, re
tards this member to cause a brake action when
the permissible speed has been exceeded.
The invention as illustrated in Figs. 1 to 13 -
inclusive is applied to a revolving door mecha
nism of the type which is illustrated in U. S.
‘Patents 1,536,196, and 1,536,197, May 5, 1925.
‘This mechanism is selected to show the operating
principles'of the invention because of the re
stricted space in which the braking apparatus
must operate, because the supportfor the door
is movable from the center .to the side of the
aperture and because the vertical stem‘ of the
door is not always perpendicular and the brake
band must be self-adjusting to suit these condi
tions. It should be understood, however, that
the braking system and speed control of this
invention is of general application in the me
chanical arts.
Fig. 7 is a plan view, partly sectioned, of the
brake band connection shown in Fig. 6;
Fig. 8 is a plan View of a supporting bracket
40
45
mechanism is secured to an existing casting by
‘
Referring to the drawings, the central stem or
shaft of the revolving door is indicated by H
and carries the wings 24 in the door opening,
which is not detailed in the drawings. The
shaft _ it passes through an aperture 235 in the'
cover 22 to the carriage which is mounted above
the cover and which is rolled to one side when
Fig. 10 is an alternative form of retarding
mechanism used with Fig. l in which a centrifuge
is used to determine the predetermined speed;
the wings of the door are collapsed. The car
riage or frame is indicated as a whole by the
Fig. 11 is another form of retarding device,
partly sectioned, in which the retardation is
socket at it’ engaged by, the bearing stud'ld,
obtained by an air ?ow through a restricted
whichis supported by the carriage 15. The op
posite side of the carriage, not shown in Fig. 1,
ori?ce;
is correspondingly constructed so that the entirev
.
Fig. 12 is a diagram illustrating the theory of
operation of the system when an electric motor
is used as a retarding agent, and,
Fig. 13 is a fragmentary end view of the mech
55
e
reference numeral 52, which is provided with a
mechanism is free to swing about the stud M.
The differential mechanism is indicated as a
whole by It and is mounted on the end of shaft
1 I, and the base H, with suitable bearing mem
55
beingsupported'by therbearingr 52. The
hers-formed, thereon, ‘is suitably secured to the’ ‘shaft,
outer end of the arm '6 lcarries the roller 2 I lwhich"
carriage or frame 52 and "Supports the mecha
nism that cooperates with the differentialfmech ' engages the periphery of the planetary member‘
and rides upon the cams l9 and 20 as this ,
anis'mfto operate the ‘brakes. ~By' the construc- '
‘w tion' shown- the invention is applied’ to a well. member is moved from'the'neutral position‘ in
‘' ,known type of revolving door mechanism with;
out changing the mechanism itself. or ‘its mode
ofoperation;
'
,
"
.
'
either direction.' This may be called the cam
arm. Another arm 64 is keyedto shaft 62 at’ ’
‘E5 and is therefore rotated with shaft 62 as the , . .
‘
'By referring to; Fig. 3 it will be noted that the ~rol1er 2i engages the cams. The. outer end ‘of
carriage I2 through the studs 26 havingthe coni- 1 arintéihas a link 5? pivotallyconnected thereto 10 ‘
?ii'andthis link is‘formedwith a jaw at768
real ends 2? supports the saddle 28, which is pro- '
‘ vided with asuitable bearing block 2g to support
the brakedrum~member 38 and sleeve 31 which
to‘rece'ive one end of the‘brake band !8 which is
pivotally ‘secured to’ the jaw Gaby the plug 69.
Another link l'? is pivotally mounted on the
therewith, either by a screw or other suitable .7 shaft £52 but is freerto rotate on'this shaft. 'This
'; means, the'pin 31a being indicated on the draw» link, at its outer end; has a jaw '73 pivotallyconr
rings for this. purpose. ‘ Through the sleeve 3| nected theretorb-y the pin: 72 and this View re
Vis-suitablyr?tte‘djto the end of shaft ii to turn
andmember ~30 the door: is suspended for rota;
ceives the opposite endita of the brake band
orrst'uds' Z‘igto the extent of theaperture “d”
central portionf‘li of the link '69 so that when‘the '
tionby the shaft 5 i. It should be notedjthat the - whichis pivotally secured thereinjby the plug
saddle
23 isvfreeito rock on the studs ill to the ‘ ill; Anarirn "i5 mounted on shaft 62 and secured
720 :extent of
the'openingf 25in the carriage iZVandI to rotate therewith by the’ pin 16 abuts on the 1
t ' :between 7273 and 12; :This is requireddu'e to the 7' ' shaft E2 is rotated in' a: counterclockwise‘direc
fact that the door isjmoved to one side by pres-. . tion, as indicated in Fig.7 '7, the link '10 isgrotated'
sure on the lower part of shaft/H which causes
therewith, but ii'shaft 82 is rotated in 'a clock
25
'
this shaft to tilt from the center, indicated‘ by ' Wise direction thelink‘ld" is not moved thereby"
the line “a” to" the'positions indicatedr‘iby f‘c" and retains a position'tange'nt to the brake- band ‘
and .“b”‘in _ a 'somewhatjexagger-ated form. '
T
T The braking‘rdrum 370 has a groove formed at 32
"abetween the ledges ‘Ed-for the brake‘band i 3, which
.is lined with a suitable fabric‘ as indicated at 33
l and which engages the drum 32 when the'brake is
applied. The upper face of the brake drum mem
' The ‘lower end of the shaft 62'has' mounted
'
thereon the arm 91%, keyed to thisshaft at 93,"and
3.0
‘
carrying at its outer vend the insulated contact
member-9i’ moving over the contacts 95. of .a ' V
rheostat mounted on the plate 95. This rheo- .
her is recessed to receive the bevel'geari 38 which I stat regulates the resistance in the circuit of
is'gsuitably secured to 3!] by screws or otherwise
and engagesithe pinion gears 37 mounted on the
generator d5».
’
.
i
_
935‘)
As the brake hand is arranged to’ engagethe, . 1 _:
bearing 36in the planetary member 35 which is - horizontal braking drum it maybe desirable in
' u
mounted upon the sleeve 3!; The opposing bevel
‘*gear?? of the differential is mounted in the top
lmemb'er d3 .andi's suitablysecured to the web M"
40
of 'this member which in turn is mounted upon
the sleeve 35 with the gear, dilieng'aging thev gear
_
certain cases to provide‘a support for: thebrake .
band somewhere near its central section.
A sup-
'
V I ,
port of this kind'is indicated in ‘Fig. 1, in which 40
the stem 85 supports the horizontalarm '84 and.
. the-link 82 which is attached to the brake band. .1
This mechanism is morefully illustrated in'Figs'. ' 3131A screw collar ‘:12 on/ thegend'ofth'e; sleeve
.3I1 holds "the ; differential’ mechanism in ‘place.’ '8' and 9, in which the base 8] is secured to. the
The. planetary member 35 is provided with a cam: frcarriage i2 and is "provided with rounded collars :45
7 i5 and another cam 25? which operate the brak- .
" ing system as the planetary member'is rotated.
V
1 ‘ The top'member
43 of the differential engages a
.‘atdii and-V95 ' engaging the horizontal 'arm 84
which is. provided with slotted apertures 86 for
" the
stem
35.
A spring 89, placed between the
friction wheel 134 connected with'the shaft 1%5 of - stem 85 and the rear portiont? of arm 84, holds
in the horizontal position
but
v
7
,the motored carried by the’ arms 48. of the bear- ' this arm normally
ing frame ill pivotally mounted upon the vertical
50
Y
'permitsit to be de?ected above the horizontal 7' ,. v
shaft :33 which is secured to base‘ i l’; The bearing . to? the position indicated ‘by the line “f”_and
below the horizontal to the position indicated‘by.
frame “is forced inwards by’ thespri'ng 50 con
nected to the bearingframe '52 at one‘end and ' the line “9” td correspond with the position of . I’
adjustably‘connect'ed to the swinging frame ill, the brake drum when tilted. ~ 'As soon as the 55
'ati?i; This construction maintains the friction 'brake drum Vasumes the horizontal position the
‘Wheel 44 in' engagement with 43 and causeslthe arm,’ tdis automatically brought-backjto'this
rotation of the armature of .motor 46 in corre-' position} The link 32 connects to the brake’
spendence‘ with'the rotation of 43. A friction
band at 8! and permits a free movement of the
drive, as shown, is‘prefe'rred for this construc
tion,‘ butit is to be understood that where con
siderable resistance is to‘ be o?ered to the rota
brake band’ in either‘ direction as well as a de
flectionrfrom the horizontal}
'
1
1
’
‘
The operation or the system as described will:
7
‘tion'of £53 spur gears may be preferable to'the now be considered with‘ reference to'the appli
‘friction drive. 1 '
cation and release of‘ the brakes by the differential I
is provided with an ; mechanism, and with:relation to the selffadjust 65.
springr55'connect‘s ; ing ‘features of the'brake. band when the 'brakeg '
'and'ri's adjustablydconnected to the upstanding drum is deflected ‘frond the;1oerpendicularr.v The
v"The planetary member‘35
‘its:j, eyelet
55 to'which the 'coil
arm 53 on the base ll’. ' The purpose of the spring
elements ofthe system will be understood from
' speed.
V mechanism I5 and the opposite side, 4|, connects‘ ‘
55 isito normally maintain the planetary member the diagram'in Fig. 12,, in which H represents ;
driving shaft prdvidedwith a brakingdru'm' 70.
v35 of the {differential ‘mechanism in the neutral :the
‘position and Vito‘ restore’ it’ to 'a- neutral "(position '32 to beengaged by a brake shoe H4. .Theshaft"
7' as tl'ie-I brakes are released'lby a: reduction vin . it connects with ‘one-side 39 of the differential; .
' V ‘The army EI-fFf'i'gsg and 4-,.‘ is'mounted upon ‘ with the retarding motor 46. This motorispro
tithe shaft 62‘ and is keyed to: this shaftatf83, the - vided with a ?eld coil‘ H3 ‘and connects to the .75
"
'3.
2,119,550
rheostat 96. This rheostat has a contact mem
ber 91 mounted on, but insulated from, the arm
BI and connected with the opposite side of the
motor 46. Thus the movement of arm 91 varies
the resistance in the ?eld I I3 of the ‘generator 46
which is otherwise short circuited upon itself
and sets up a retardation corresponding to its
speed and which can be regulated by regulating
the resistance of the rheostat.
10
The planetary member 35 is maintained in the
neutral position by a spring 55 and has provided
thereon a cam I9 which engages the portion IIZ
of the lever 65, moving this lever on its pivot I II
against the action of spring II5, thereby bring
15 ing the brake shoe I I4 into engagement with the
brake drum 32 and changing the value of the re
sistance in the ?eldcoil I I3. When the shaft I I
is rotated it produces a corresponding rotation of
the parts M and 35.
Theplanetary member 35
20 must overcome the tension of spring 55 before it
can move from its neutral position, with the re
sult that the driving movement from shaft 1!
applied to 39 is taken up by the corresponding
reverse movement of member AI and generator
25 46. At normal speeds the movement thus ap
plied to generator 46 offers very little retarda
tion to M and there is not sufficient torque ap
plied to the planetary member 35 to rotate this
member to the brake applying position. As soon,
V30 however, as the generator ll?exceeds the normal
speed the retardation to 4| is thereby materially
increased with the result that the sustained ex
cessive speed of shaft II moves the planetary
member 35 against the action of spring 55 until
35 the cam I9 engages the roller 2! and thereby
causes a brake application and a reduction in
speed.
This reduces the speed at which the gen
erator 46 has been driven, resulting in reducing
its retardation and permitting the spring 55 to
40 restore the planetary member to the neutral posi
tion, thus releasing the brake application. The
planetary member 35 is provided with the cams
I9 and 20, one on each sidev of the roller 2I, so
that a braking eifect will be obtained when the
shaft II is rotated at excessive speeds in either
direction.
.
,
The sensitiveness of the system described can
50
arm 94 which is controlled by the arm 6|. As
the fan I05 increases its speed it delivers more
air to the ori?ce I0? which sets up a retardation
to the fan and this retardation may be further
increased by the valve 508 reducing the ori?ce
IIi'I.
From Fig. 1 it will be noted that the shaft 62
which supports the arms carrying the brake band
18 is ?xed with relation to the base I7 and the
carriage I2, while the brake drum may be de
flected to have its center corresponding with the
position “b” or “c”. If it is assumed that the
center of the brake drum is de?ected to the posi Ef5
tion “b”, then the periphery will correspond with
the dotted line “c”. This permits the roller 2! to
move towards the'center to engage the line '_“e”
and moves the center of the. arm 6! from the
position indicated by line “it” to the position in— 620
dicated by the line “7'”, and in turn the shaft 52
is rotated so as to bring the center of arm 64
from the position indicated by line “it” to the
position indicated by line"‘l”. At the same'time
the arm '55, Fig.7, is moved to the position indi
cated in dotted outline at “p” while the link ‘ill
remains tangent to the end 18a. of the brake band.
The result is that by moving the center of the
brake drum away from the shaft 52, the brake
band has been correspondingly shifted through i130
the movement of the arm 6% to compensate for
this change in centers. The brakes may be oper
ated under these new conditions but the lost
motion between “a5 and ‘iii must be taken up
before a pull is applied to the end I80. of the as
brake band.
'
If the brake drum center is shifted to the poSi-V
tion “c” the roller 2i will be moved outwards
from the center and the arm 64 will be correi- ‘
spondingly moved in a counter-clockwise direc
tion about the shaft. 62 ‘thereby taking up the
‘slack in the brake band. The normal operationv
of the link 70 in the brake applying position is
‘indicated by the line “m” moving the brake band
I So into position corresponding with line “11” 1'
Fig. 7. When the arm 65 is moved in a counter
clockwise direction there is a movement of the
be regulated by regulating the speed of retarda
tion of the generator and by regulating the ten
arm 75 towardsthe position “m” which helps to
sion on spring 55.
braking drum being centered at “c”.
In the application to revolv
take up the slack in the brake band due to the
ing doors it has been found that speeds upto
It will be observed that the channel 32 of the
12 R. P. M. are entirely safe for most tra?ic,
while speeds of from 15 to 20 R. P. M. are liable
brake drum is comparatively deep and permits a ~
' to cause accidents and a speed control device of
55
This ori?ce is controlled by the slide valve I08,
operated by shaft 59 and linked by'98‘ to the
the type described is desirable to prevent these
excessive speeds. When the door is started from
a position of rest and is quickly accelerated to a
speed of 10 or 12 R.'P. M. there is the possibility
that this quick acceleration will momentarily
speed up the generator to the retarding point
andcause a partial movement of the planetary
member but this partial movement does not re
sult in a brake application as the cams I9 and 253
are so located that the partialmovement must
65 be exceeded before these cams become effective
in applying the brakes.
,The alternative retarding device for th‘emem
ber 43 illustrated in Fig. 10 comprises the centri
fuge I00 driven by the friction wheel M and
70 having a collar Iili which slides on the shaft 135
and carries the ?ange I02 into engagement with
the brake shoe IE3 which is manually adjusted
by the screw I64. The arrangement shown in
Fig. 11 has the friction wheel 44 driving the air
75 fan I05 in the funnel I06 with the ori?ce 151.
reasonable amount of slack to exist in the brake
band so that small variations between the centers _
“a” and 52 can be compensated for in this way.
It is also to be noted that where the brake band
is applied with a pull at one end only such
through the arm {it the end 58a may be'secured,
to a ?xed member on the base 57 instead of the
link ‘E0. The ends of the brake band are rounded '60
where they ?t into the connecting jaws as indi—
cated at M,
5, so that the band itself may
pivot about the attaching plugs 68 and 14.
The differential mechanism, Fig. 1, ?ts di
rectly upon the shaft of the door and comes
within the clearance of the carriage which sup
ports the door.
I
The gears 38 and
40 are shown _
as made separately from the supporting castings
as these gears can be purchased from commer
cial stock. The cup shaped form of the lower
gear 38 and the supporting drum form an oil'
reservoir for lubricating the mechanism.
When applied to a revolving door of the type
shown in the patents referred to, the bearing I5
for the pivoted frame I2 is mounted on a car
[£119,550]
‘
y,
,
r
light speedcontrol device :44 at an
V :riage; which rolls the door and the. mechanism ' icomparatively
increased- speed, and the‘ mechanical retarda
to one side of 'the door aperture and this inven
tion particularly facilitates this operation. The’ tion between the'device and the speed control’
.
braking drum and the gears are centered’ on the . member causes the cam‘ to operate the brake.
door shaft and come‘ substantially within the The‘ extent of this retardationis regulated byrthe ;_5 .
clearance of the trackway, as' indicated atv20 in Irheostatrilli when the'i'electrical- controlis' used; “
Patent 1,536,197.: The control mechanism sup 'by the brake I02, I03’ when the centrifuge is
7 ported by the base I‘! also comesrsubs'tantially 'used and by the valve I08 when the air flowde- .
withinthe clearance of the trackway. It should
110 ' be understood thatthe bearing members are ap
I plied through base I] when the apparatus is ap
'vicel?5
is
used.
'
,
a
"
'
.
;V
'
t
The power for operating the brakes isderived {l0
' from the shaft to- be braked and ‘is’ applied bya
'‘ ‘
cam mounted on this shaft andoperated by-the
pliedv to an existing» carriage, otherwise these
members may be "formed from the stock of the"
.retardingdevice; by
‘
,
1
7.7
i
i
I
.
V
r
The brake band is'held in alignment by a self-f
centering device having -a free'motio-n' in two
frame 12.
'The'braking effect is obtained by applying ten- '
31i5 '
7 directions at right angles to 'eachother and'havr
'sion‘to‘ the brake band to move it relative" toithe,
a bias to bring the band to the centre of‘. the
'drumrotating' aboutithe'door 'axis'. {The braking _' ing
is thus applied direct to the'door shaft and is groove in the drum,‘ but'without impeding‘ the .
movement of the bandiaround the drum.
notr=transmitted through 'gearingandvthere are
.
20
"
The endsrof"the;'brake bandare connected {g0 ~
'no movin'g'pa’rts within "the drum for affecting
the braking. The drive/of the control mecha
toa three way. crank, theoperating end vof which ~ ‘ " -
nism; through .the framed‘! and ‘frictioniwh’eel' ten-gages the'operating cam. Each .endof the
‘ vM. adapts itself to’ the‘displacement of ether’ door; brake-bandis connected to one arm of the crank":
f "by a universal connection'iin which the'band may ’ ,
shaftgin anyydirection;
.
r
_ .
relativeto thecrank arm in two planes at $5
Q'I'he invention, is shown applied with’adiffer imove
ential gear of the well known commercial ,type. right angles to each other.- One of the crank
‘arms is connected with the operating end of the’ '
t ' Itshould be-understood however that the in
vention can be applied with different forms of crank by .a lost motion so that§~motion is 'not -
differential gearswhich' have a planetary mem- p impartedto the brake baridby an initial move- _ Y
'1
‘*ber, andttit may be applied with a di?erential ment of the. operatingrenfd. '
Thebrake'band is maintained inoperative re- '
»gear of the hydraulic type'in which a fluid "is
' lation to the‘ brake drum'although the axis; of the '
forcedbetweeni the members of the hydraulic
‘Vmechanism. through’ the differential member
' .without the use ofispur gears.’
' . '
"
drum mayfshift’while the axis of the‘crankop
V
7
erating
the ' brake band
remains ' ?xed. .
The‘
V
V
“It should: he understood that the function lof " tension on the brake band is self adjusting un
.
,
the driving member, the ‘drivenmember and the derthese conditions.
described myinvention, Itclaimt'
vplanetary‘meniiber of the differential mechanism , ,'Havingthus
1.'A braking’ system comprising. arotating
V
V >may be interchanged“; For instance the top '1'
' member,“ may be regarded as the planetary and .
V ‘140' if this member is'held-in a neutral position the ’ '
j middle member _35 will .rotatejwiththe driving
'1 Vmember
3!].1
V
,
V
..
;
-
V
.
Y ' The ‘operationpf the mechanism in Figs. 1, .
>2 and 3 will be understood ‘from thedescription V
brake drum’ having'a sleeve'rotating with the " '
drum,‘ a brake band for said drum, means forays-‘(Q9
mounted
plying a upon
pull said
to said
sleevebrake’
and rotatable
band and
about
V a V cam
the
same axis as said brake drum for controlling said'
'means.
2. ‘A braking system comprising-a supporting .45
'of'Fig. l2 iniwhich, retarding?'oauses the plane;
brake band
brakedrum
for saiddrum,
mounted
meats
on; said
in’
tary. member 35,:to'be, rotated until I9 engages. frame, a rotating
roller 2| and’ applies tension to the brake'band cluding a supporting member pivoted 'to?- said
' l'8_~ to apply‘ the brakes and'reduce the speed. ' The
speed reduction lessens the retardation and en
frame for operating said brake‘band to applyand ' '
V
743 to rotate’ at the same speed as'32, .or at ’_ release the 'brake'sjandia cam rotatable about '{50
'50 ables
agigreater speed if ' the spring 55 restores the the axis of said drum for controlling said meahsf-f
distance between saidj'supporting member '
J planetaryxmember‘to the released position there-v the
and the axis of said drum being variable. '
' by releasing the brakes and restoring normal
conditions. If a brake applicationhas been made I
the member 43 mustbe'rotated in the re'versedi- '
rection at a greater speed than the shaft I l to
. release’ the application. This tends to'dampen
' , the speed of shaft‘ H.
_ 3. A. braking system comprising a horizontally ' 7."
disposed rotating brake drum, a. brake band for ;‘.5_5
said drum, a pivoted arm, a link having a jaw‘?
'at 'one end pivoted to said arm with a pivot par;
' allel to the axis of the drum at the other end, a ' '
second pivot connecting the end'of'the brake’
7' It ‘should be noted from’ the operation of the band withsaid jaw,’ said second pivot 'being'at 45,0
system that the power for operating the brakes right angles to the axis of the drum and permit- if
is .derivedfrom the, driving shaft H, and that’ ting a freemovement of the brake in the direc
the braking effeictis‘ produced by’ retarding the
driven member 43'," with relation to the driving
'
member“;
x
In this construction itrwill {be observed that
the braking ‘system is'self-contained at the 'end
of‘th'everticaljjshaft. . The .brake drum. overlaps
and partially encloses vthe ‘braking member :23
thereby‘. savingvertical space, The drum; the
“7'0" controlling cam‘ and the speed control member ,‘43
‘hare 'allfmountedfto‘revolve about the'cent‘re ‘of
the shaft. The mechanism; apart ‘from the levers
7 for'tensioning the brakeband and the speed con
tion'of the
drum axis.
‘
r
r
4. A braking
system comprising
V
'
a
.
'
supporting
,
frame; a rotating brake drum mounted on said Q55
frame, a brake bandrfor said drum, means iii-7
'
cluding .a supporting member pivoted on "said
frame for operating said brake band, the dis
tancebetween said member and the axis of said.
brake drum being variable; and means for auto- 3
’
.
matically adjusting said brake 'band’vto said var
iable
distances.
.
'
~
I
»'
51r A braking’ system comprising arrrotating "
a brake drum, a brake band for said drum, means
trol" device ‘is’ ‘mounted on the shaft.
-~_~The speed "control! member 43 operates the ' including a supporting member for I operatingt75~
2,119,550
said brake band connected to the ends of said
band, and pivoted self centering means support
ing said band intermediate its ends.
6. A braking system comprising a horizontal
rotating brake drum, a brake band for said drum,
means for operating said brake band to apply
and release the brakes including pivotal connec
tions for the ends of said brake band, said pivots
being at right angles to the axis of said drum,
10 and self centering means supporting said brake
band intermediate its ends.
'7. A braking system comprising a differential
mechanism having a driving'and a driven mem
ber connected by a planetary member, a braking
15 mechanism operated by the planetary member
as it is moved from a neutral position, yieldable
means for normally maintaining said planetary
member in the neutral position and means inde
pendent of said mechanism for retarding the
20 driven member to cause movement of the plane
tary member.
8. A braking system comprising a differential
mechanism having a driving and a driven mem
ber connected by a'planetary member, a braking
25 mechanism operated by the planetary member
as it is moved from a neutral position, yieldable
means for normally maintaining said planetary
member in the neutral position, a retarding mem
ber independent of said mechanism for retard
30 ing the driven member and means for automati
cally regulating the retardation of said retarding
member.
,
9. A braking system comprising a differential
mechanism having a driving'and a driven mem
35 ber connected by a planetary member, a braking
mechanism operated by the planetary member as
it is moved from a neutral position, a spring nor
mally moving said planetary member to a neu
tral position and means independent of said
mechanism for retarding said driven member to
overcome said spring and move said planetary
member to the operating position.
10. A braking system comprising a driving
shaft, a braking drum and a driving member of
45 a differential mechanism mounted to rotate with
said shaft, said differential mechanism compris
ing a planetary member and a driven member
connected With said driving member by said
planetary member, means independent of said
50 mechanism for retarding said driven member to
cause movement of said planetary member, and
braking means for said drum operated by said
planetary member.
11. A braking system comprising a differential
55 mechanism having a driving and a driven member
connected by a planetary member, a braking
mechanism operated by the planetary member
as it is moved from a neutral position, yieldable
means for normally maintaining said planetary
60 member in the neutral position, and means inde
pendent of said mechanism engaging said driven
member by friction for retarding its movement
to cause movement of the planetary member.
12. A speed control system comprising a driv
65 ing shaft, a differential mechanism having one
member connected With said shaft, a planetary
member biased to a neutral position, a driven
member operatively connected with the first
member by said planetary member, a braking
70 mechanism operatively connected with said
planetary member and a speed limiting device
connected with said driven member to cause
movement of the planetary member when a
predetermined speed is exceeded.
75
13. A speed control system comprising a driv
5
ing shaft, a differential mechanism having one
member connected with said shaft, a planetary
member biased to a neutral position, a driven
member operatively connected with the first
member by said planetary member, and a speed
limiting device connected with said driven mem
ber to prevent its speed corresponding with the
speed of the driving shaft to cause movement of
the planetary member and effecting a brake op--'
eration.
14. A speed control system comprising a driv
ing shaft, a differential mechanismhaving one
_10
member connected with said shaft, a planetary
member biased to a neutral position,- a driven
member operatively connected with the ?rst 15
member by said planetary member, a braking '
mechanism
operatively connected‘ with‘ said
planetary member, and an electric generator con
nected with said driven member to retard said
member and cause movement of the planetary 20
member to the brake operating position.
15. A speed control system comprising a driv
ing shaft, a differential mechanism having one
member connected with said shaft, a planetary _
member biased to a neutral position, a driven 25
member operatively connected With the ?rst
member by said planetary member, a braking
mechanism operatively connected with said
planetary member and an electric generator con
nected with said driven member to retard said
member to cause movement of said planetary
member to the brake operating position, said
planetary member controlling the circuit of said
generator.
'
16. A braking system comprising a brake drum, 35
a brake band for said drum, a cam for operating
said brake band, a member pivoted on the same
centre as the brake drum for operating said cam
and a device engaging said member by friction
for operating said member to operate the ‘cam.
.
.
40
17. A braking system comprising a brake drum, '
a brake band for said drum, a cam for operat—
ing said brake band, a member pivoted on the
same centre as the brake drum for operating said
cam and a rotating device engaging said mem 45
ber to affect its movement and means for regu- ’
lating the movement of said device.
7
18. A braking system comprising a brake drum.
a brake band for said drunrna cam for operat
ing said brake band, a member pivoted on the 50
same centre as the brake drum for operating said
cam and a retarding device engaging said mem—_
ber to affect its movement and means for varying
the retardation of said device as the degree of
bra-king is varied.
19. A braking system comprising a brake drum, 5
55
a brake band for said drum, a cam for operating
said brake band, a member pivoted on the same
centre as the brake drum for operating said cam
and a retarding device operated by the move 60
ment of the drum and co-operating with the cam ‘ '
for applying the brakes.
20. A braking mechanism comprising a rotat
ing member, a brake drum, a brake band for said
drum, a cam for operating said brake band, a 65
spring controlled arm supporting a member in -
engagement with said rotating member by fric
tion and means for operating said cam by said
arm supported member.
,
21. A braking mechanism for a vertical shaft
comprising a differential mechanism having a 70
planetary member mounted on the shaft, one
member of said differential mechanism rotating
with the shaft and having a braking surface, a
braking shoe for said braking surface, said plane
75
~
.
2,1,19,75,56
the aids Brine‘ drum and bemg'riee‘w move ,with
vtaryfmember havingrarcam formed thereon" and the
,brake'band on the periphery of the drum.’ ' ‘
means operating said'brake shoe by said cam,
30. A braking system comprising av brake drum, 7
“said differential mechanism,,having another
a brakeband forvsaid drum; meansffonapplying
'7 Q member foroperating said planetary member.
tension to the ends ofv saiddbrake band toapply
,the'ybrakes and" a support ‘for said; brake, band 1
, 22. , A braking ,mec'hanism'for a :vertical shaftv
" comprising a differential Imechanism having a'
,member with a sleeve mounted to rotate with the
intermediate its;ends,';said support QOmprising a:
member normally'swingingfin the plane ,ofthe ,
' shaft and having a‘braking surface, a planetary
10'
drum but h'avirig'av free'movernent at right '
'memberand another member freely mounted on V brake
angles
‘thereto Vand'having a ,bias‘Tto bring ittov f
said'sleevea'braking shoe for'said braking sur
normal: position. ,
facersaid,planetaryfmember having a cam formed: ' V the,
1 371. Abrakingsyst ‘m
comprising ajdiffer'ential
mechanism
having
a
planetary
‘m'ember'withf-a
' said ica'mjand a : device- regulated by speed 'operaf '
memberlon each side thereof ,a sha‘ftto be ‘braked; ,
" tivelyengagingsaid other member-to‘ cause move- ,
thereon" and'means operating saidv brake ' slide by
, said, ‘di?erential, ,rn'e'chanism ;mounted on I said
merit of said planetary ‘member? ' ~
shaft and one of .‘saidimembers' rotating with said
, a 23.: A braking mechanism for avertical shaft, ' shaft, said planetary' member beingzmounted‘for
."jcompri'singa bearing for. thefshaft; a1" braking
r
rotationfree of .said shaft, a spring'operatively '
- 'd'rumm'ountedto rotate With the shaft, said drum , connected withjsaid planetarylmembe'r tothold‘ it _> '2 '
being’ largerrathan the bearing and partially enj
‘ in‘ a normal position,‘a brake 'shoe,;means for s
closing the bearing, said drum 7 formingone side
,bringing's'aid'brake shoe into the braking posi-a»
of a-rdifferential mechanism comprising a plane
tion bysaid planetary member as said member is ,
; tary 'member' having’ a- cam formed , thereon ‘and,
another'side, a brake shoe’ for said drum oper-r
,
‘1'2
moved from the normal position,'the ‘brake oper- V
ation being controlled by the other member
ated byv'said cam and ‘means for'controlling the
other side of the differential mechanism to cone
.
of the differential mechanism.
32. A braking system comprising a differential
' mechanism, having a driving and a driven meme
r‘ 24._ A braking mechanism for a shaft compris
ing a differential mechanism having one member lberl'connected by a planetary member, albraking v ,
trollthe
brakes.
'
r
r
,
r
I
mechanism operated by the'movement of said
planetary member, means for smaintainingsaid
- irgtating
idrum,,a planetary
with the shaft
member
andand
formed
a second
in a member
braking
30
'
planetary» member in, a neutral postion and a , V
rotating ion the same 'axisias 'said'shaft, a brake,
centrifugev operated brake 'forl‘r?retarding-said , _, V
fband ifor'said drum, means for. operating said. driven member to cause movement of the 'plan'e- ,
brake band by said‘ planetary member and means
1» 7; controlling said second member to control the " tary member.,
I
33. A braking system
35
,
brake.
_
V
,
V
V
,
r
g
7
25.‘ A braking mechanism: for a revolving door
7 comprising, a'carriage, a shaft for the door having
mechanism operated by the movement of said
a bearing on said carriage, a5 brake drum on the
'7
planetary member, means’for maintaining said
' end of said shaft, "a brake band for said drum,
planetarylmember'in a neutral position and an,
op‘erating'connections;for saidrbrake band pivoted
. 40,
air fan for'retarding said driven member to cause
on said carriage and means responsive to ‘speed
for operating said brake band.
"
' a
comprising a differential '
mechanism having a driving and a driven mem
ber connected by a planetary member, a braking
..
movement of the planetaryi'member;
"
'
34. A brakingsystem comprising a differential
261A braking m :cha'nism', for a revolving 7 door
mechanism having, adriving and a driven mechae
shaft for the" door, a horif
connectedby a planetary member; abrak;
45 zontally Vdisposed'brake mum; on: said shaft, a‘ nisming
mechanism
operated’ by the movement vof said
horizontally disposed‘ brake bandrforlsaid drum, 7
» comprising a‘ vertical
member, means for- maintaining said
means responsive to speed foroperating 'sa'id' planetary
planetary
member
inra neutral position, means
brake band and a'horizontallyiswingin'g arm cone _
associated with an airv ?ow forretardingsaid
nected to said brake bandintermediateits ends,
' driven memberto cause ‘movement of th'eplaneé ‘
so for centering said ‘brake band on thedrum.
tary member and means for controlling said air
' :i 5 '27. 'Abrakingmecha'nism comprising a brake
drum, a' brake band for said drum, a' three arm ?ow.”
35. A support
,
'for a brakeband'on-a
'
a
brake drum
crank ‘having one :a'rrn' connected to’ one end or, , 1comprising a ?xed stem, an arm pivotally mount- 1
‘the brake band and‘ianother arm, connected to‘ ed' on said stem through a slotted aperture,’ a
55, the other end of the brake band and means 'as- ' ' spring normally holding said arm in a predetere
'sociated with the third, arm for operating the
' f 60
mined position and alink pivotally connecting 1
‘other tworarms' to apply the brake,'one of 'the said arm with’ the brake band, said link beingv
arms connected 'withjthe brake band being con ,mounted to move freely on said arm with the
nected with thejoperating arm through a' lost longitudinalmovement of the, brake band‘andlbe
_m'otion<connection.
V
a
r
1
~
'
'
'
ing heldv rigid by said arm to resist the'transve'rse
I
' 281A braking mechanism, comprisinga hori-V , movement of the band; "
361 A-braking syst m fora revolving door com?’ 7
' ' , zontal brake drum, a horizontally disposed brake ,
.55
band engaging said brake drum, a: horizontally
disposed crank for operating saidrbrake band,
prising a vertical shaft supporting and revolving b5 _
havin'g'a pair of arms, a link pivoted 'to each of
drum on the end of said shaft, a brake shoe for f
said drum and a'cam- operating about the axis'of
said shaft controlling‘ said brake band to apply
with the door, a horizontally disposed braking
i ,7 said arms by a vertical pivot and each end of the
brake ‘band pivotallyrconnectedtoieach link by a
horizontal pivot-1
70
'
f
V
‘
‘_
,
and release the brakes.
<
-
~
,
,
'
7 '37. A brakingsystem for a revolving door com-J ‘
29. A braking system comprising a braking
drum, a brake band for said'drum; means forep 1 ‘prising a vertical shaft supporting and revolving
.plying tension to the, ends of ,said'brake band, to, ' with the door, a differential mechanism having, 7 V
apply‘ the ‘brakes and/ a support for’ said brake V a planetary member mounted on theaxis or" said 1
» vbandintermediate its ends, said supporticompris;
ing armember mountedito move at right angles to ~ '
shaft; a braking mechanism operated by said I
planetary‘ member and'means for operating said J75
‘
2,119,550
7
differential mechanism to apply the brake when
comprising a carriage, a shaft for the door having
a predetermined speed is exceeded.
a bearing in said carriage, a brake drum on said
38. A braking system comprising a differential shaft, a shoe pivotally mounted on said carriage
mechanism having a driving and a driven mem
engaging said brake drum and means responsive
ber connected by a planetary member, a braking to the speed of said shaft for applying said brake
mechanism operated by the movement of said shoe to said brake drum.
planetary member, means for maintaining said
41. An article of manufacture comprising a
planetary member in a neutral position, an elec
differential mechanism having a driven element
tric generator connected with said driven mem-‘ and a driving element and a planetary member.
" ber to retard said member and cause movement .pivotallylmounted on the same axis, said plane
of the planetary member and means controlling tary member having a gear connecting said ele 10
the circuit of said generator by said planetary ments and a'spring connected with said plane
7 member.
tary member to move it to a biased position and
39. A braking mechanism for a revolving door a cam on said planetary member.
comprising a carriage, a shaft for the door hav
42. An article of manufacture comprising a
ing a bearing in said carriage, a brake drum on *"di?erential mechanism having a planetary mem 15
said shaft, a shoe pivotally mounted on said ' ber and a pair of members connected therewith
carriage engaging said brake drum, a member through a ?oating connection, said planetary
pivotally mounted on said shaft and means as
SO
sociated with said member for applying said
brake shoe to the drum when the speed of rota
tion of the door exceeds the speed of said pivoted
member.
member being pivotally mounted and yieldable ‘
means connected with said planetary member to 20
place it in a biased position and a cam on one
of said members.
7
40. A braking mechanism for a revolving door
MATTHEW H.’ LOUGHRIDGE.
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