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Патент USA US2112609

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March 29, 71938,
_‘5_SCHNELL
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2„112,609
BRAK I'NG MECHAN I S M
Filäd Feb. ‚3, 19:54
3 Sheets-Sheet 1
FIG.3.
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Inventar
Att’yy
March 29, 1938.
S. SCHNELL
i 22,112,609
BRAKING MECHANISM
Filed Feb. 5, 1934
3 Shee‚ts-Sheetf
Inventor
‚gz;;i AM ~
Att’y
March 29, 1938.
5‚ SCHNELL
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2,112,609
BRAKING MECHANISM
Filed Feb. 3, 1934
5 Sheets-Sheet 3
Att’y
Patented Mar. 29, 1938/
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TIVUNITED STATE‘S PATENT OFFICE«Ü '
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ner Ele(:tric Corporation,_St; Louis, Mo.‚ a eo!‘
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poration of Delaware
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Applicat\ion Februgry 3, 1934, Seriil Nq. ‘7092553
~12 =Clalms. (01. 1848-152)“
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My Vinvention. r_elä.tes to b_rakihg mechanism
' and niore pa_z‘ticularly ‚.t‘o„mea‘ils for taking„up
‘ slack in braking Systems 9Ln'd t0 meäns for changIng the pedal leverag<ä ratiö. '
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Support und compr‚ises a dylinder 2, a. piSton« 3,
und al reservoirl; The ‘reservoir l Is in com_mu-‘
nicatiqn with thecylinder by means ‚of compen
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sating port 5 when the piston is mov€d to 1ts 17e_- '
In both hydrauli‚calljz and rheqjhaniqally-‚ayctuated brakes a.s now manufactüred, itisneoessary
tracted position again‚shthe stop 6 by the plston 5‘
return spring, as shown_in Figure‘l. vThe. piston
to 'move;‚the brake pedal a considerable distande
beIfore„the brake ‘shoe‘s are brought int0_'cq'ntact
with the brg‚k_e
‚This„ p4ad2zl~ moyeme_nt
10 which perfprn'1s nqusef_ul work and_ is‚ therefo‚re,
~ a waste of vphysica)l effort, also necessitatyes,v using
a sma.ller pedal leverage ratio sing; the pegdal
is provided with the usual _paqking cup ‘I; und a
secondary packing 8. The c_ylinder ab the reza.r~
o1’ the pistonähead is„_at all times in communlca
tion with the reservoir by means of the opening 10
9. The pipe I0 provides communication between
the cylinder a.nd each of the bxake shoe' actuat- ‘
tra.vel effeqtivq 1x1 abplying brajkiry;g ?r‘essure Is
reduggd__„
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Ing motors (not shown)’. In prior standardc011
structlons the piston is a‚ctu_ated by the 'brake.
One of the objects of‚my ‚inveptlbn is tqp_rovide
a b_raking system with‚ means for taking up slack
in sabrakin'g systemwithout movement of the
brake pedal.
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Anoth_er object of‚my invention_ls to Provide
20 power-operated means for‚ taking -up slack in a.
brake system„which means functions when the
operator’s foot i5 placed.upon‘ the peda.l pad and
be1’ore theypedal ‚is moved.
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Still another object of my invention 1s to pro-
25 vide means whereby either _o_f‚several‘pedal lever—
age ratios mayv be employed_to operate a brake
withouia change in the total pedalytravel necessary for_ agiven displacernent cf the brake actuating elemen‚t.
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pedal throughconnecting means pivoted thereto. 15
‚In the construction above- described, when the
pedal is moved to actuate thepiston 1:0 apply
pnessure to the system, the pedal must; be ini
v’ßially moved a considerable di‘stance be_f0re any
braking e?ect is secur_ed sinceihe-piston 3 has 20
to be ?rst moved past ‚the_port ito close the
cylinder and then moved an, additional distance
to bulld up suf?cient _pressure to move the brake
shoes into ‘engagement- with_ their drums. „'I'his ~
Initial pedal movement necessary totake up slack 35
inv the braking system and_to secure a braking
effect, may be as great as two or’ three Inches
at the pedal pad, and 1t often exceeds the amount
of pedal movement- necessary to produce the-de
Other objects of my invention_ will become apparent f_ro_m the following description taken in
sired bra‚king a.ction»~ afber ~the slack has been 30
taken up. Thispedal movement to take up the
connection with the accomp‚anying drawings
showing_several embodiments thereof‚ in which
slack in I;he braking systemdecreases thepedal
tra‚vele?ective in applyingbraking pressureand
Figupe 1.15 a view, partly in crpss-section, of a
35 hydraulic compressor and_ pedal themf_or em-
prevents the use of a. grea’cer pedal leverage ratio.
Therefore, the ‚elimination ofzthis movement Is 35
bodyihgmy
tional i(iew on
invention;
the l_ine 2—-2
Figure
of 2Figure
is a cross-sec1‘;—.Flgure
3 is a cr‘oss-sectional view of the valve mechanism
for the Esuction motor_; Figur3 4 i_s‚ an enlarged
40 cross-selqtional view;of the control_port fpr the ‘
highly
In .accordance-with
desirable. :’
myiinvention
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I have de
vised means whereby the s1ac_k 1 in 'the braking
system will automaticallybe taken up -a‚s soon as
the operator's foot is placed on the; pad of the 40
va_lve; F‘Igures .5 and 6 are views similar t0 tha.t
peda.l and without the necessity of any movement
of 11gur_e;‚l‚»showing differe_nt operating ‚posi-
of the peda1. Also, bymes,nsof myinventionl
tions; Figure 7 is a.wiew illustrating a modi?cation of the structure shown by Figure l; Figures
45 8 and 91 are cross-_sectional views taken on ’the
am able to employ either of two pedal leverage
ratios to operate the brakes without ‘a. cha‚nge in
the peda1 travel necessary to move‘the compres- 45
Iines 8-‘—8 and 9--9‚ respectively, of ~ Figure 7 ;
sor piston a selected distaxice.
Figure 10 Is a yiew illustrating a furthermodi?cation;/Figure 11 is. a cross sectional view taken
' ..The brake pedal II a.t its pivoted end is bifur
cabed to form_ a .s1ot I3 (Figure2), thelegs I3
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on the’ 1ine II_—-I I~ pf jE‘iguz/y6 1_0; fand Figm‘e 12
50 is‚a v;äw shoWir_ig how, the invehjysion i‘sembodied
in mechanicällY-actuatgdbraking mechanism.
R/e’ferring to ‘Figures 1 to 6, inclusive, the numeyral I indicatesa standard type of compensat?ng compressor used on a hydraulic brake sys-
being provlded with a bearing «boss I5 for receiv
Ing the pivot pin I6. ' The .usual coiled spring I'I 50
maintains the peda1 in its retracted. posltion
against»the ?oor boards of.the vehiele_„ Ea.ch leg
I4 is formed with coinciding inclined s_10ts18
through which extends a pin I9 for‘ connecting
55 tem, th1s ‘ compressor is mount;ed on. a‚ auita‚_hle‚
tl_1_e Pedal to, the forked end of the piston rod I2. 55
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tinches from the pedal plvot-and I;he pin as belng
3 inches
is in the
Is moved
5 ed), und
from the pedal pivot. If the pin I9
lower end of the slotwhen the pedal
(the suction ‘motor hdvlng been operat
If we consider ‘the'slo'c I8 as being ap
proxlmately one-halfin‘ch logg, the ratio w1ll'be
v6 to 1 'for then the pin I9 will only _be 21/2 inches
' fron'1 the p‘ivot 'of the pedal. Regardless cf the
' leverage ratio being usecl, "the ?nal posltion ~o1’
10- the compressor piston for affull peda‚l travel will
be the same, due to the fact that the _slot I8 1s.
vertlcal at the end ‘of .the„ Pedal travel.
In Figures 7, 8 and 9'I have shown my Inven
vtlonv embodied In a. slightly modl?ed construction.
15 The pin und slot connection between the plston
1"0d and the pedal is replac’zed_‘by‚a toggle cdn
nection. 'I'he lower end of thebedal I I 1's pro
vlded with an off-set forked end 42 which re
ceives thepedal pivot pin I 6,‘. The forked end
20 of the piston rod I2 i's vri_lvotzatlly con_nected by a
pa.ir of links 43 with the' pedal H. 'I'he suction
motor 20 and I;he control v'alve 21 are suspended
on‘the (pivot pin IG in the same manner as vin
Figure 1. The connecting link 25’ actua‘ted by
25 the suctior'1 motor 20, is connect_iad to the pivoted
connection beätween 'the piston rod„l1?and the
links 43. The remainlng lsti=_ur;t‚ur’e is the„same
as that shown in Flgure' ‘1.„Thä öperation of I;his
modi?c‘atiön is the same’aS that‚. of .Figure v_1.
clalm as new' and desire to-secure‘ by Letters
Patent of the United 'States iS:
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1. In brak‘lng mechanism, a brake pedal, a
longitudinally movable rodfor operatingihe
brakes, connecting means betwelan the;r‘od va.nd
the pedal whereby the rod 1s movable wlthßthe
pedal,’ said connectlng means perniittlng sa.idv
rod to be moved longltucllnally indiapendently
of the pedal, means comprlsing a ?uid motor
rnovable vwiIsh the' pedal for‘ moving seid rod;_-In-’ 10
dependently of the pedal to t‘a‚ke up sla.ck in
the brakingmechanism‚ and a valve _on the pedal
pad for governingthe ?uid motor.
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2. ‘In braking mechanism, a. pivoted br'ake
pedal provided with a. slot incllned withrespect ‘
to a vertical axis when the pedal is‘ in‘ an ‚in
operative position, a longitudinally mov&ble rpd
for operating the brake~ and proVided with‘ a
pin extending into said‘slot, a. ?uld'n'1otör piv
otally mounted on the pivot of sa.id p'edal‚‘con
necting means between the motor sind the ‘pin
forv moving the- pin in I:he slot, a vcontrol valv'e.
for said motor, and means on- said brake ‘p‘zädaIl
for governing said control valve-with'oüt mdve
ment of the pedal.
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3.; Inhydraulic brake actuating mechan'ism,'‚a
cylinder, a. piston movable therein, a. reseryoir
in commum'cation w1th the cylinder‘whdan the
piston ls in retracted posltlon‚a plvoted lever, a
30 When‘the loperator’s foot is pla.cäd «im the sec- ' rod connected to the lever and the plston whe'reby
ondary pedal pad, the suctlon motor Is imme
dlately operated am] the movement_of the link
the plston may be actuated by movement o! the
lever about its pivot, and means operayble wlthdut
25' stralghtens out the toggle conn_ection .be-f
movement of the lever for changlng I;‚he leverage
tween the piston rod I2 and the pedal, thus mov
ratio 01 the lever und 1'or simultaneously moving
the rod longitudinally to thereby move‘ the piston
35 Ing the compressor piston forward, taking up
slack in the brakes, und changing the leverage
ratio of I:he pedal.
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In Figures 10 und 11 I have shown the links
43 of Flgure 7 replaced ‘by a pair of bell-crank
40 levers 45 pivoted to the peda.l II. The ends 45'
of the bell-crank levers extend .to a. point ad
jacent the pedal pivot I5 and are connected by
20
30.
In pressure applying direction and_cut 011 com
munication between the reservoir and the -cyl
Inder.
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4. In hydraulic brake actuating mechanism. a
cylinder, a piston movable therein, a reservoir 40
in cor'nmunication wlth-the cyllnder when the
piston ls in retracted positlon. a pivoted lever, a
means of a ?exible oable 48 to the suction mo-_ -rod connected to the lever and the plston whereby
tor 20 mounted (‘m a ?xed part of the vehicle. the piston may be actuated by movement of the
45 When the suction motor is operated, the bell
lever about. its p1vot, means 'operable without 45
crank levers are rotated on the pedal, thereby movenient of the lever for moving the connectlon
straligh‘tening I:he boggle connection between the' between the lever und I:he rod closer to the lever
piston rod I2 and the pedal, thus moving the ‘ plvqt and means 1'or moving the rod »lox‘agitudl
compressor piston and taking up slack in the nally when sald connection is moved I;o therebjr
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60 brakes.
move the plston In pressure applying dlrectlon
In Flgure 12 I have shown how my invention and cut o?' communication between the reservoir
may be applier_i to “mechanically” actuated and the cylinder.
brakes wherein the pedal operates a cross-shaft
5. In braking mechanlsm, a. movable element ’
41 'which in turn operates the brakes by‚sultable for operatlng the brakes, an actuating member
55 rodding of well known construction. 'I'he slack for said element, connecting meana for contin
take-up structure illustrated is the same as that uously maintaining an ope'rative connectlon be
shown in Figure 1 except that I:he nisten rod tween the actuating member and the element buI;
I2 is replaced by a pull-rod 48 connected I:o arm
permittlng movement of the elemez‘1t relative to
49 on the cl‘oss-shaft 41. When the suctlon -said member without breaklng said operative
60 motor is operated ‚the pin I9 1s moved in the
connection whereby any movement of the actu-_
slots I8, thus moving the rod I2 longitudinally ating member will ca‚use a. simultaneous move
ment cf the element, and ?uid pressure-operated
to I;ake up slack in the braking system.
means for moving said element in brake applying
It is to be noted that a braking system equipped
with my sla‚ck take-up und pedal leverage ratio direction without movement of v the actuatlng
65 changing device will always operate in the usual ‘member, said last named means embodying »a
control valve 011 the actuating member.
manner in case the device should become dis
6. In braking mechanlsm, an elemeni: Ior oper
abled.
Being av?rare of the possibility of many other' ating the brakes, a lever, a connection between the
and the element whereby the elem(mt may
470 modi?cations In the particular structures'herein lever
at all tlmes be moved with each movement o! the 70
described,_without departing from the funda
lever but permitting said element to be moved
mental princlples of my invention, I do not in
relatively to the lever, means tot moving sa.ld
tend that; 1ts scope be limited except as set forth element indepe'ndently of any movement of the
by the appencled claims.
' lever to take up slack in the braking mechanism,
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Havlng fully described my invention, what I
?uid pressure means for operatlng said ?rst 75
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