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Патент USA US2136302

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Nov. 8, 1938.
2,136,302
J. w. LEIGHTON
HYDRAULIC BRAKE CYLINDER AND METHOD OF MAKING SAME
.Filed Feb. 15, 1956
lN_V ENTOR
BY
W
_
Vlad-pr!‘
_
ATTORNEYS.
2,136,302
Patented Nov. 8,‘- 1938
UNITED STATES PATENT OFFICE
$136,302
HYDRAULIC BRAKE CYLINDER AND
IHETHOD OF MAKING SAME
John W. Leighton, Port Huron, Mich.
Application February 15, 1936, Serial No. 64,018
12 Claims.' (Cl. 29-4521)
construction removed showing in detail the ar
The present invention relates to master cylin
der constructions for hydraulic brake systems, rangement of parts making up the improved
'such as are commonly used in automotive ve
master cylinder construction.
'
>
hicles. More particularly, the present invention
With more particular reference to the speci?c
relates to a novel form of hydraulic brake ~cylin
der and associated ?uid reservoir and to a unique
method of manufacturing the same.
embodiment of the invention illustrated in the 5
' It is a general object of the present invention
to provide a brake cylinder construction which is
easy and cheap to manufacture and which, when
completed, provides an arrangement of parts ex
' tremely strong and rugged in construction.
The present invention contemplates’ the pro-,
vision of a brake cylinder and associated feed res- _
15 ervoir which are formed by uniting a pair of pre
formed sheet metal stampings in face-to-face re
lationship and securing the stampings together
to provide a unit construction. Prior to their
securement, the stampings are preformed to pro
vide semi-cylindrical
recesses in _ the surface
thereof, which mate with eomplemental semi
cylindrical recesses in the opposite stamping, so
that the recesses together will not only form the
reservoir and the cylinder, but also provide ports
or ducts therebetween.
,
1
The present invention further contemplates
the provision of a supporting bracket structure
which is permanently secured to the members
making up the cylinder and reservoir construc
tion, which serves to position these parts and
maintain them in- predetermined assembled posi
drawing, the construction shown therein com
prises a pair of sheet metal stampings ill and H
?anged in their marginal edges and secured to
gether through these mating ?anges to provide a
fluid reservoir 12 and a cylinder l3. _
10
As is conventional in constructions of this
general character, the cylinder i8 is adapted to
receive, and has mounted therein a piston l5 ,
which, at its forward end, is provided with a
cup shaped washer Id of suitable resilient ma
15
terial adapted to closely engage the walls of
the cylinder. This washer I6 is maintained seat
ed against the face of the piston l5 and its pre
determined longitudinal position within the cyl
inder is maintained by means of a conical com~
pression coil spring H, the opposite end of which
is supported in a suitable metallic annulus ll of
angle section positioned substantially against the
end wall of the cylinder. The rear end of the pis
ton I5 is constructed to provide recess for seating
an annular sheet metal retainer 21! whichserves to
support an annular resilient packing member 2|
which is urged radially outwardly against the
walls of the cylinder by means of a suitable
spring split ring 22. i The piston l5 has an axial 30
bore therein adapted to receive a suitable oper
atlng rod 25 which, as is conventional, is connect
tion during the time they are welded.
The invention further contemplates a method . ed 'by means of suitable mechanism to the op
erating pedal.
_
.
of manufacture for articles of this type which in
The brakelcylinder construction as a whole is
' cludes novel steps hereinafter pointed out, which supported by means of a bracket 26 preferably
contribute to a greatly simpli?ed process for
making the brake cylinder disclosed herein, and
also other similar articles where analogous prob
lems are involved.
40
7
Many other and further objects and advan
tages of the present invention will become clearly
apparent from the following speci?cation when
formed of sheet metal and or generally triangu
lar con?guration. This bracket has a plurality
of holes 21 therein adapted to receive suitable.
bolts for mounting the structure as a whole on
r
the frame
of the vehicle. The bracket is pre
formed in its central portion to provide a sub-'
considered in connection. with the accompanying 7 stantially cylindrical opening therein adapted to
receive portions of the stampings Ill and H and
drawing forming a part thereof.
.
In the drawing:
,
Figure 1 is a top plan view-of the improved
master cylinder construction showing a frag.
mentary portion of'a brake operating mechanism
connected thereto.
so
.
-
'
‘Figure 2 is a transverse sectional view taken
substantially on the line 1-4 of Figure 1 showing
the interior construction ovfythe master cylinder
.and associated reservoir and showing in detail
the arrangement of ports.v
Figure 3 is an end elevation with thepiston
to closely surround and position the same. As 45
will be apparent from the following, this bracket
26 is permanently secured to the mating stamp- .
ings l0 and II and forms substantially an in--,
tegral part thereof in the ?nally assembled con
struction. The metal of the bracket 26 is pre 60
formed around this central aperture to provide
an axially extending, annular ?ange 28 which
provides means for mounting one end of a ?ex
ible extensiblebellows or boot 29 surrounding
the brake operating am.
If desired, the rear
2 .
arsaaoa
end of the cylinder ll may be closed by a suitable
annular washer 30 retained in place by means of
an expansible split ring 3|.
v
_
In the manufacture of the improved master
cylinder assembly of the present invention, the
cylinder construction has been provided.
pair of substantially identical sheet metal stamp
The above specific embodiment of the inven—
tion is merely illustrative of the generic inventive
concept presented herein. Many and other fur
ther modi?cation modifications falling ‘within the
scope of the invention as de?ned in the sub
joined claims will be apparent to those skilled in
ings are formed substantially as described above.
These stampings i0 and II are each provided with
semi-cylindrical depressions therein surrounded
10 by ?anges which lie substantially in the plane of
the sheet of metal from which the stampings were
formed. These semi-cylindrical depressions mate
to form the cylinder I 3 and the fluid reservoir i2.
At the time these stampings are formed, they are
15 also preformed to provide semi-cylindrical de
pressions in the mating ?anges which together
form a ?lling opening 35 of substantially circular
con?guration when the two stampings are placed
together face to face. The stampings are further
20
preformed to provide mating semi-cylindrical
grooves which form ports 36 communicating with
the cylinder I3 and ducts 31 whichprovide com
munication‘ between the reservoir l2 and the cyl
inder l3. After the stampings have been formed,
25 the faces thereof are ground to provide plane sur
faces and to create the necessary sharp corners
'
vide a reservoir and a cylinder therebetween.
2. A master cylinder construction for brake
systems comprising a pair of sheet metal stamp 20
ings having mating ?anges secured together face
to face, said stampings being preformed to pro
vide a reservoir, a cylinder, and a port providing
communication between said cylinder and reser
25
voir.
3. A master cylinder construction for brake
to face, said stampings being preformed to pro
vide a reservoir, a cylinder, and a port communi
I O'and II and serves to lock them in assembled
Suitable strips of copper wire may
35 relation.
then be disposed within the cylinder and with
in the reservoir adjacent the juncture of the
two sheet metal stampings which make up these
elements. Additional copper wire may be dis
posed adjacent the joint between the stampings
and the bracket 26 and the assembled apparatus
_ as a whole is then heated to welding temperature
in an inert atmosphere and the copper from the
wire will flow into the cracks and seal the mating
45 stampings together and the bracket thereto to
‘
ings having mating ?anges weldedv together face
to face, said stampings being preformed to pro
ing relation face to face and the bracket 26 is
will be seen that the cylindrical portion of this
bracket encompasses portions of the stampings
.
.
What is claimed is:
l. A master cylinder construction for brake
systemscomprising a pair of sheet metal stamp 15
systems comprising a pair of sheet metal stamp
ings having mating ?anges secured together face
‘stampings which constitute the cylinder i3. It
40v
the art.
at the mating edges of the cylinders and ports.
The stampings ill and ii are then placed in mat
30 slipped over the projecting portion of the mating
.
if the parts are accurately assembled, no trace of
the joint between \the mating sections is discern
ible. From the foregoing, it will be appreciated‘
that an extremely simple and satisfactory master
eating with said cylinder.
-
v
4. A fluid reservoir for hydraulic brake systems
comprising a pair of sheet metal stampings
?anged in their marginal edges and secured to- ‘
gether through said mating ?anges said stamp
ings being preformed to jointly provide a substan
35
tially cylindrical opening communicating with
said reservoir.
‘5. A ?uid reservoir for hydraulic brake sys
tems comprising a pair .of sheet metal stamp 40
ings ?anged in their marginal edges and welded
together through said mating ?anges, said ?anges
each being preformed to provide a semi-cylin
drical groove therein, said grooves cooperating to
provide an openingccommunicating with the in- ‘
‘provide a substantially integral construction.
terior of said reservoir.
After the parts have been welded together in this
manner,‘ the ?ller hole 35 may be internally
threaded to recive a suitable plug and the port 38
may be internally threaded to receive suitable
v'6. A master cylinder construction for hydraulic
brake systems comprising a pair'of sheet metal
stampings having mating ?anges, said stamp
ings being secured together face to face through
fittings /for connecting feed conduits thereto. _ said ?anges and forming a cylinder therebetween.~ 50
which feed conduits normally extend to auxiliary
7. A master cylinder construction for hydraulic
cylinder constructions located adjacent the brakes brake systems comprising a pair of sheet metal
vof the vehicle with which the master cylinder is stampings having mating ?anges, said stamp
It will be notedthat the ports providing ings having substantially identical semi-cylindri
55, used.
65
communication between the reservoir and the
cal depressions therein and welded together face
cylinder are of relatively small size and conse
quently there may be somewtendency for these to face through said ?anges, said depressions to
ports to clog as atresult of the welding process.
Consequently, itqwill be noted that the feed hole
35 is disposed in such position that access may
be had to'these ports should it be necessary to
drill them out after the welding operation has
_?nally been completed.
65
After the
eet metal parts have been assem
gether forminga cylinder between said stamp- .
ings.
8. A master cylinder construction for hydraulic 60
brake systems comprising a pair of sheet metal
stampings having mating ?angesr said stampings
having substantially identical semi-cylindrical
depressions therein and substantially semi-cylin
bored out with a diamond drill to provide a
drical grooves in said ?anges, said stampings be 65
ing secured together face to face whereby said
smooth, cylindrical, internal surface and the pis
ton and other associated parts may then be in
depressions mate to form a cylinder and said
grooves mate to form a port in communication
bled and welded together, the cylinder J3 may be
stalled. It has been found that the grinding of
the adjacent faces of the mating stampings
which make up the cylinder construction and
4 the subsequent diamond boring of the interior of
the cylinder provide an extremely satisfactory
with said cylinder.
'
v - 9. The method of forming a master cylinder
construction for use in hydraulic brake systems
which comprises forming a pair of stampings hav
ingmating ?anges which together provide a cyl
75.. construction and it has been further found that inder therebetween, welding said stampings\to
70
3
gether and ?nishing the interior of said cylin
in: matinc?snleswhich mam-mam. 7
between _a cylinder and a port communicating
der to provide a smooth cylindrical interior-sur
face.‘
,
‘
' with said cylinder. welding said stanudngs to
10.- The method oi’ forming a master cylinder
construction for use in hydraulic brake‘ systems
which comprises forming a. pair of stamp!!!“ hav
ing mating ?anges which together provide there
gether face to face. finishing the interior or said
cylinder to‘ provide a smooth cylindrical surface 5
and internally threading said port.
12..’I'he method of forming a master cylinder
between a cylinder, a reservoir ‘and sport provid-.
construction for use in hydraulic brake systems
which comprises forming a pair of stampings hav
ing mating ?anges which together provide a cyl- l0
inder therebetween, copper welding the ?anges of
ing communication between said cylinder and
'10 reservoir, welding said st'ampings together and
?nishing the interior or said cylinder to provide
.
a smooth cylindrical interior surface.
11. The method of forming a master cylinder
construction for use. in hydraulic brake systems
15 which comprises forming a pair of stamping! hav
said stampings together. and diamond boring‘
the interior surface of said cylinder.
'
JOHN w. man-mu.
-
p
15
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