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Патент USA US2135100

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‘Nov. 1, 1938.
2,135,100
c. A. CAMPBELL
FILTER
Original Filed OCt. 15, 1937
N15
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3nventor
Bu
(Ittomegs
Patented Nov. 1, 1938
2,135,100
UNITED STATES
PATENT OFFICE
2,135,100
FILTER ‘
Charles A. Campbell, Watertown, N. Y., assignor
to The New York Air Brake Company, a cor
poration of New Jersey
Application October 13, 1937, Serial No. 168,825
Renewed September 29, 1938. v
3 Claims. (Cl. 183-44)
This invention relates to air ?lters and particu
cotter pin 25 retain the ?lter disc in place, the
larly to such devices intended for use in brake cyl
hole for the cotter pin being so located that
inders or the like. The invention, however, is plate IT is slightly sprung or dished, and hence
susceptible of use in ?ltering air, where the ?ow serves as resilient means to compress the edges
5 occurs under moderate pressure, and where of the felt layers and produce a good seal on
economy and ease of replacement are important rim M.
factors.
The construction has several advantages. The
In the air brake art it is now standard practice ?lter unit is simple to construct, has a long life,
to apply a breather to the guiding head (some
and is protected from water and from vandals.
10 times called the non-pressure head) of the‘brake The ?lter disc itself includes the resilient means 10
cylinder, .and to protect this with a ?lter so that used to seal the ?lter to its seat and is adequate
the entrance of dust and cinders isminimized or to maintain the seal throughout the life of the
prevented. The present invention provides a disc. The only machining required is the opera
?lter which is inexpensive to construct and easy tion of drilling the hole for bolt 23-—all other
15 to ?x in position.
parts receiving their ?nal form in the casting
The invention will now be described by refer
ence to the accompanying drawing, in which;
Fig. l is a half elevation of a brake cylinder
partly broken away to show the location and con
20 struction of the ?lter.
Fig. 2 is a face view of the ?lter shown in
Fig. 1.
,
.
Modi?cations are possible.
The use of two
layers of felt of different textures is preferred
but not essential, and other foraminous plates may
be substituted for the woven wire cloth described.
The manner of mounting bolt 23 may be modi?ed.
What is claimed is,—
Fig. 3 is a section on the line 3--3 of Fig. 2. ‘
Fig. 4 is a section of the front head of the brake
2
operation.
cylinder, looking downward relatively to Fig. 1.
In Fig. l the brake cylinder is indicated at 6,
1. The combination of an enclosing member
having a breather port, and an annular seat sur
rounding said port; a drip ring for resisting the 25
entrance of water through said port; a retaining
the rear or pressure head at ‘I, the front head at ‘ pin substantially concentric with and normal to
8, the piston rod at 9. This rod is attached to
piston I I and is guided in the front head 8. The
3 O piston return spring is shown at I2.
These parts
may be of any usual construction except that the
front head 8 is provided with a breather port and
?lter seat which will now be described.
The head 8 is provided with an outwardly
35 convex bulge I3 surrounded on the inner side of
the head by a circular seat rim I4 to receive a
disc shaped ?lter unit. ‘ This unit is made up of_
a layer I5 of coarse fabric, preferably felt, and
a layer I6 of ?ner fabric preferably also felt,
40 backed by a foraminous metal plate I‘! preferably
of woven brass wire. The parts I5, I6 and H
are stitched together by means of spaced wire
staples I8. These pass through both layers ‘of
fabric and the foraminous plate I1 and are
45 clinched, as indicated. There is a central per
foration 20 as indicated in Figs. 2 and 3.
the plane of said seat; a ?lter unit encircling said
pin and engaging said seat, said unit comprising
a disc of fabric ?ltering material and a resilient
plate-like foraminous backing; and retaining 30
means reacting between said pin and plate and
de?ecting the plate to develop elastic sealing
stress between the unit and the seat.
2. The combination of an enclosing member
having .a breather port, and an annular seat sur
rounding said port; a retaining pin substantially
concentric with and normal to the plane of said
seat; a ?lter unit encircling said pin and engag
ing said seat, said unit comprising a disc of
fabric ?ltering material and a resilient plate-like
foraminous backing; and retaining means react
ing between said pin and plate and de?ecting the
plate to develop elastic sealing stress between
the unit and the seat.
7
45
3. A self-sustaining ?lter unit comprising a
The bulge I3 forms a chamber I9 surrounded by ‘resilient foraminous metal backing plate and a
circular rim I4, and from thischamber leads the porous fabric facing attached together, said fac
breather port 2I below which is a drip rim_ 22. ing being adapted to seal on its peripheral mar
50 A pin or bolt 23 is driven through a drilled hole ginal area against an annular seat and said plate 0
in bulge I3 and makes a drive ?t therein. The being arranged to be stressed at its center to de
hole is so located that bolt 23 is normal to the velop an elastic sealing pressure upon the sealing
plane of circular rim I4 and concentric there-' area of the facing when in use, such plate having
with.
su?icient rigidity to retain approximately its
Bolt 23 passes through hole 20 in the ?lter original unstressed form while stressed to develop 55
55
disc, which disc is mounted with layer I6 against such elastic sealing pressure.
rim l4 and plate H on the back (i. e. on the inner
side relatively to head I3). A washer 24 and
CHARLES A. CAMPBELL.
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