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Патент USA US2110342

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March 8, 1938.
P, SALVO
2,110,342
SAFETY DEVICE FOR HYDRAULIC BRAKES
‘
Filed July 6, 1957
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INVENTOR,
Patented Mar. 8, 1938
» 2,110,342"
UNITED STATES PATENT ‘OFFICE
2,110,342
SAFETY DEVICE FOR HYDRAULIC BRAKES
>Pete Salvo, Oakland, Calif.
Application Jilly 6, 1937, Serial N0. 152,044
7 Claims. (Cl. 303-—84)
tical opening 3 are two aligned longitudinally dis
This invention relates to safety/means for hy
posed openings 5 and 6 which are located in the
draulic brakes.v
upper side wall of the casing. The outwardly
'An object of my invention is to provide an’im
proved safety device for use with the hydraulic ' disposed ends of the openings 5 and 6 respectively,
6 brakes of an automobile which permits the con
tinued operation of - one or more of said brakes
even though the ?uid supply line to another of
said brakes becomes broken or ceases to function.
Other and further objects of my invention will
be pointed out hereinafter, indicated in the ap
pended claims, or obvious to one skilled in the art
upon an understanding of the presentdisclosure.
For the purposes of this application I have elected
' to show herein certain forms and details of safety
15 apparatus for use with hydraulic brakes repre
sentative of my invention; it is understood, how
ever, that the embodiment of my invention herein
shown and described is for the purpose of illus
tration only; and that it is not to be regarded as
20 exhaustive of the variations of the invention, nor
is it to be given an interpretation such as might
have the effect of limiting the claims, short of
the true and most comprehensive scope of the
invention in the art.
In the accompanying drawing:
Fig. 1 is a vertical longitudinal section or my
improved safety“ device for hydraulic brakes;
,
Fig. 2 is a sectional view taken on the line 2-4
of Fig. 1;
30
\
'
Fig. 3 is a sectional view taken on the line 3—3
of Fig. 1;
I
Fig. 4 is a sectional view taken on the line 4-4
of Fig. 1; and,
r
‘
.
v
I Fig. 5 is a diagrammatic view showing the
means employed for signalling the disability of
one of the brakes or the ?uid conduit leading
thereto.
-
I
>
'
,
r
‘
'
"
‘ Referring to the drawing the numeral I desig
‘nates an elongated casing which in ordinary prac
40 tice is secured to a suitable oil reservoir by means
of threaded inlet and outlet means 2. The cas
ing at a point approximately mid-way between its
ends is provided with a large vertical opening 3
extending from the top side of the casing/to a
45 point near its lowenside. The upper end of the
are normally closed by suitable means such as UT
screws 5' and 6'. Mounted for vertical recipro
cating movement in the opening 3 is a cylindri
cal ?oating piston ‘I which is open at its bottom
end and closed at its top, except for a very small
opening ‘I’ through which a limited amount of oil 10
or other pressure ?uid may proceed.in a down
ward direction to that portion of the opening 3
located beneath the said piston, and also through
which air may pass to break a vacuum in said
lower portion of the said ‘opening 3 when the
piston moves in an upward direction.
The piston 'I is normally but yieldably main
tained by a spiral spring 8 in an upwardly dis
posed position with its upper end engaging with ‘
a tubular nut 9 which is adjustably screwed in
the upper threaded end of the opening 3. The
vertical position of the adjustable nut 9 may be
adjusted by a screwdriver or other tool so as to
change the inactive normal position of the piston
‘I with respect to the bottom end of the hole 3,
whereby the amount of the charge of the ?uid
ejected by the downward movement of the piston
may be varied.
The casing I is provided centrally with two
large longitudinally disposed aligned chambers I0 ..
and II, ‘having, respectively, restricted end por
tions I 0' and II’ which communicate with the
large vertical opening 3. Secured to the opposite
ends of the casing I. and communicating respec
tively with the outer ends of the chambers III and
II are hollow plugs I (la and Ila. Screwed into‘
the sides of the hollow plugs Ilia and Na respec
tively are tubular conduits I2 and I3 leading to
the wheel cylinders of the front and rear brakes
of an automobile or other brake mechanism if the
device is used with hydraulic brakes or other type
of apparatus. ‘The hollow plugs‘ I 0a and Ila. are
provided with threaded openings which are nor-‘
mally closed by plu'gs I?b and I Ib, the said open
ings being intended for use in attachingja pump
opening 3 is threaded and is normally closed by a .or other apparatus for priming purposes as will
removable screw plug 4.
The ?uid inlet and out- " be later described.
Secured to the ends of the‘
let means 2 of the casing connects with the upper
hollow. plugs “Ia. and Na respectively are tubular
end of the large vertical opening 3. In‘ ordinary
nuts I00 and I Ic which have tubular bushings “Id
50 practice and in accordance with well known con
and Ild secured thereto. The bushings “Id and 50
structions, the oil is discharged under pressure
from the oil reservoir into the casing I when the
automobile brakes are applied by operating the
usual foot‘ pedal or hand lever.
_'
Communicating with theupper end of the ver
55
rubber or bakelite and rods Ilie and Ile pass re-'
spectively therethrough and are insulated from
the hollow plugs and the casing bysaid bushings.
Ild are made from insulating material such‘ as
That ‘portion of each rod We and I Ie which passes I
2
2,110,342
through its respective bushing is threaded, and
nuts I01‘ and II)‘ thereon serve to maintain the
inwardly disposed ends of said rods in predeter
mined positions for a purpose later to be de
scribed.
The inwardly disposed ends of the rods
We and He slidably extend through openings in
- the ends of cylinders log and Hg respectively,
and each has an enlargedend ‘which prevents its
detachment from' its associated cylinder. The
10 inwardly disposed end of the cylinders II'Ig and
I lg are closed by suitable screw plugs I4, and lo
cated in each of the cylinders is a spiral spring
I5 which engages with the said screw plug and the
enlarged end of its associated rod. The cylin
15 ders Illg and I lg are spaced from their associated
hollow plugs Illa and I la so as to prevent an elec
trical current from passing from either of the
said cylinders to the casing I as will be later
20
described.
Slidably positioned inside the large chambers
I0 and II respectively, are pistons I6 and I‘! which
are adapted to move from their normal inwardly
disposed adjacent positions, outwardly in opposite
directions so as to force ?uid from the chambers
25 I0 and II into the conduits I2 and I3, and thence
therethrough to the wheel brakes.
-
Extending longitudinally through the lower
side wall of the casing is a small opening I8, the
central part of which is in communication with
the large vertical opening 3.‘ The ends of the
opening I8 are closed by screws or other suitable
means. Extending vertically through the lower
side wall of the casing I and positioned adjacent
the ends of the latter are two openings I9 and 20
35 which communicate with and serve to carry fluid
from the opposite ends of the small longitudinal
opening I8 to the large chambers I0 and II. The
walls of the lower ends of the openings I9 and
45
50
55
60
65
70
75
wardly against the pressure of the spring 8,
thereby injecting the ?uid located in the lower
end of the opening 3 and in I8 through the open
ings I9 and 20 into the chambers I8 and II. As
the piston 1 moves downwardly it passes below 10
the points where the restricted end portions I0’
and II’ of the chambers I0 and II join the verti
cal opening 3, thereby allowing the ?uid then be
ing injected into the casing under pressure to
exert an outward force against the pistons I6 15
and H, which are thereby actuated toward the
opposite ends of the’ casing. The charges of
?uid in the chambers I0 and II are thereby
forced to the brake mechanisms at the vehicle’s
wheels, through the conduits I2 and I3. In ordi 20
nary practice the pistons I6 and Il travel out
wardly toward but not to points where they en
counter the open ends of the hollow plugs Illa and
I la, but if either of the conduits I2 or I3 or their
associated brake mechanism is disabled thé par
ticular piston. associated with the said disabled
conduit or brake will be actuated into closing en
gagement with its associated hollow plug. If
either of .the lines I2 or I3 happens to be broken,
that particular line which is broken will be kept 30
closed by its associated piston while the other
line will function in its normal way to convey
?uid to and from the brakes to which it is con
nected. In normal operation upon releasing the
lever or foot pedal the'outward pressure on the 35
inwardly disposed ends of the pistons I6 and I1
is removed, and thereupon the pressure of the
compressed ?uid in the wheel brakes moves the
said pistons back to their normal positions at the‘
a tubular nut 2| which provides a seat for a ball inwardly disposed ends of the chambers I0 and 40
22, the said balls being yieldably pressed down
II. After the pistons have been moved back to
wardly by spiral springs 23 to close the openings their normal positions the ?uid returning into
I9 and 28. The balls 22 normally prevent ?uid the chambers I0 and II from the conduits I2
from passing downwardly from the chambers I0 and I3 passes through the openings I6’, I6a and
and II to the small opening I8, but they allow Il’, I‘Ia of the pistons I6 and I1 respectively, and
the ?uid in the opening I8 to be ejected by the - into the vertical openings 25, from whence it
downward movement of the piston ‘I into the ?ows through the small openings 5 and 6 into
chambers I0 and II. Screwable plugs 24 close the upper end of the vertical opening 3 and
the lower ends of the openings l9 and 20.
thence outwardly through 2 into the reservoir.
Extending downwardly through the upper side
So as to provide means for visibly indicating
Wall of the casing I in communication with the the brake lines which become broken or disabled
upper small longitudinal openings 5 and 6 and I have operatively associated electrical circuits
with the inwardly disposed ends of the longitu
and electric light globes 29 and 38 with the oper—
dinal chambers I6 and II, are vertical openings ating mechanism above described. The rods We
25 which are controlled by balls 26 so as to allow and l to are electrically connected respectively to
fluid to pass upwardly from the two chambers the electric light globes 29 and 36, while the latter
I8 and It into the small openings 5 and 6 re
are connected to one side of a battery 3i or other
spectively, but to prevent the reverse movement source of electrical energy. The battery 3| at
of ?uid from the said small openings to the said its opposite end is connected to the casing I and
chambers. The upper ends of the openings 25 to a ground 32. The inwardly disposed enlarged
are threaded and closed by removable screw plugs
ends of the rods We and He are in engagement
21. The pistons I6 and ii are provided with with the cylinders lily and Hg respectively and
axial openings I6’ and I1’, respectively, the in
the inwardly disposed ends of the latter are posi
wardly disposed ends of which are closed except tioned so their associated pistons I6 and Il en
for radial extensions Mia and Ila leading to an
gage therewith when they are moved outwardly
nular grooves I61) and Ilb respectively in the toward the outwardly disposed ends of the cas~
peripheries of the inwardly disposed ends of the ing. The spiral springs I5 in the cylinders I89‘
said pistons. The annular grooves 96b and I'll) and Mg permit the latter to be‘ moved outwardly
are so disposed with respect to the adjacent ends when the pistons engage therewith so as not to
of their respective pistons I6 and I ‘I that the said interfere with the closing of the inwardly dis
grooves register with the openings 25 when the posed ends of the hollow plugs Illa and Na by
said pistons are disposed in their inwardly dis; the said pistons. When the pistons contact the
posed normal positions at the adjacent ends of cylinders 66g and Hg the circuits to the light
the chambers.
globes ‘29 and 38 are closed, and the globes are
When the foot pedal or hand lever is actuated energized and lighted. The globes remain lighted 75
26 are each threaded to adjustably accommodate
40
to cause the application of the braking mecha
nism at the wheels of the vehicle, a charge of
?uid is forced through the inlet and outlet means
2 into the casing I. The incoming charge of
?uid causes the piston ‘l to be pressed down—
3
2,110,842
so long as the pistons engage with the cylinders brake mechanism is disabled, means in the casing
I09 and Hg, but in normal practice if there is, for conveying charges of ?uid to the chambers,
no appreciable leak in the conduits I! or 13 the and means actuated by ?uid entering the casing
back pressure of the ?uid will move the said pis
for forcing charges of ?uid to the chambers.
tons inwardly as soon as the foot pedal or hand
3. In a safety device for hydraulic brakes, a '
lever is released, thereby again opening the cir
ciated wlth'the particular energized light globe
casing having a chamber having ?uid outlet
means and ?uid inlet means’, a piston interposed
in the chamber between the inlet means and the
outlet means, the piston being adapted to be
moved by ?uid entering the chamber to eject a 10
charge of ?uid through the outlet means and
thereafter close the said outlet means, and
means in the casing and actuated by ?uid enter
ing the latter for pumping a charge of ?uid into
the chamber, whereby the chamber may contain
is disabled.
?uid to be ejected by the piston.
cuits to the globes 29 and 30. If one of the con
duits I2 or 13V is broken the piston associated
with the said broken conduit will remain in a
10 closed position over the open end of its asso
ciated hollow plug and also in engagement with
the adjacent cylinder. The continued lighting
of a light globe after releasing the brakes will
indicate that the particular conduit I2 or l3 asso
,
So as to prime the device after it has been oper
ated, when for some reason, such as a broken
conduit, there is no back pressure of the ?uid
20 at one of the wheel brakes, one of the plugs lllb
or llb (depending on which line is disabled) is
replaced by an attachment of a suitable pressure
pump, and thereafter ?uid is injected into the
casing to force the outwardly disposed piston
" back to its normal position at the inwardly dis
posed end of its associated chamber In or II.‘
The conduits l2 and I3 ordinarily have'suitable
extensions or branches so that ?uid may be sup
plied to say, the front wheel brakes by the con
v duit l2 and to say, the rear wheel brakes by the
conduit l3.
‘
In the event either of the conduits I3 or M
breaks there will be no pressure applied to the
particular wheel brake associated with the broken
conduit, otherwise the'device will function in a
normal manner.
40
.
1
This application for Letters Patent discloses
subject matter similar to the apparatus shown
and described in my co-pending patent applica
tion ?led September 5, 1936, Serial No. 99,577,
entitled “Safety device for hydraulic brakes”.
,
4. A safety device for hydraulic brakes com
prising a casing having a pair of chambers and
?uid inlet means, ?uid outlet means and ?uid
inlet means associated with the chambers, the 20
said outlet means of each chamber being con
nected to a brake mechanism and the said inlet
means being connected to the inlet of the casing,
a ?oating reciprocating piston positioned in each
chamber between its outlet means and its inlet 25
means, the said pistons each being adapted to be
actuated by ?uid entering the casing through the
inlet means to discharge ?uid from its associated
chamber to its associated brake mechanism‘ and
to thereafter close the outlet means of its associ 30
ated chamber if
is disabled, and
to be actuated
pressure of ?uid
its associated brake'mechanism
the said pistons being adapted
in reverse directions by back
entering the chambers through
their outlet means from the brake mechanisms 35
and channel means in the pistons-and the casing
for allowing ?uid entering the chambers through
their outlet means to proceed to the inlet means
of the casing.
5. In a safety device for hydraulic brakes, a
casing having a ?uid inlet, a plurality of cham
Having described my invention what I claim is:
1. A safety device for hydraulic brakes com’
prising. a casing having a ?uid inlet opening ex
bers in the casing, each having a ?uid outlet con
tending through its side wall, the casing having
casing, a piston in each of the chambers adapted
to be actuated by ?uid entering the‘ casing
through the latter’s inlet to discharge ?uid from
its associated chamber to its associated brake
mechanism and to thereafter close the outlet of
its associated chamber if its associated brake 50
mechanism is disabled, and means actuated by
?uid entering the casing for injecting a charge
‘of ?uid into the chambers.
a pair of oppositely disposed and aligned cham
bers communicating at their inwardly disposed
ends with the inlet opening, the said chambers
each having ?uid outlet means at its outwardly
disposed end connected to a braking mechanism,
a piston in each chamber, the said pistons each
being adapted to be actuated in’ an outward di
rection by ?uid entering the casing to force
nected to ‘a brake mechanism, and each having
a ?uid inlet connected to the ?uid inlet of the
6. In a safety device for hydraulic brakes, a
casing having a ?uid inlet, a plurality of cham 55
charges of ?uid from its associated .chamber to
its associated braking mechanism, and to close
theoutlet means of its chamber if its associated
bers in the casing each having a ?uid inlet con
brake mechanism is disabled, and said pistons
nected to the ?uid inlet of the casing and each
being adapted to be actuated inwardly by a back
pressure of ?uid entering the chambers through
GO the outlet means from the braking mechanisms
and means actuated by ?uid entering the casing
having a ?uid outlet connected to a brake mech
anism, a piston in each chamber, the said pistons
each being adapted to be actuated by ?uid en 60
tering the casing to ?rst eject ?uid through the
prising a casing having a ?uid inlet opening and
outlet means of
associated bra'ke
the outlet means
associated brake
a pair of substantially aligned chambers having
actuated by ?uid entering the casing for inject
for priming the chambers with ?uid prior to the
outward movement of the pistons.
.
,2. A safety device for hydraulic brakes com-v
its associated chamber to its
mechanism and to then close
of its associated chamber if its
mechanism is disabled, means 65
their inwardly disposed ends in communication ' ing a charge of ?uid into the chambers, and
with the inlet opening, the said chambers each
having ?uid outlet means at their outer ends,
pistons in the chambers for ejecting ?uid from
the chambers, the said pistons each being adapted
means forv indicating the closing of the outlet
means Ofeach chamber.
'
'7. In a safety device for hydraulic brakes, a 70
casing having a ?uid inlet, a plurality of cham
bers in the casing each having a ?uid inlet con
to be actuated in an outward direction by ?uid
entering the casing to ?rst force charges of ?uid
to its associated braking mechanism and to then
nected to the inlet‘of the casing and each having
close its associated outlet means if its associated
a piston in each chamber, the said pistons being
a fluid outlet connected to a brake mechanism,
4-
2,110,342
each adapted to be’actuated by ?uid entering ated signalling device associated with each cham
the casing to ?rst eject ?uid through the outlet
ber, the said devices being each connected in a
means of its associated chamber to its associated - normally open circuit, and means for closing the
brake mechanism and to then close the outlet
means of its associated chamber if its associated
brake mechanism is disabled, means actuated by
?uid entering the casing ‘for injecting a charge
of ?uid into the chambers, an electrically oper
circuits when the pistons are moved to a position
whereby the outlet means of the chambers are 5
closed.
PETE SALVO.
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