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Патент USA US3095300

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June 25, 1963
c. G. HOCKETT
7
3,095,290?
END SEALING MEANS FOR FILTER CARTRIDGES
Filed Oct. 26, 1960
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INVENTOR.
CARL
BY
G.
HOCKETT
'
em (a. m-LM
ATTORNEY
United States Patent 0 " IC?
1
3,095,290
Patentecl June 25, .1963,
2
ring shaped pleated ?lter element 10 preferably formed of
3,095,290?
?
END SEALING MEANS? FOR? FILTER
V
CARTRIDGES
Carl G. Hockett, Uxbridge, Mass., assignor to Framl Cor
poration, Providence, R.I., a' corporation of Rhode
Island
_
Filed? Oct. 26, 1960,~Se_r. No. 65,212
2 Claims. (Cl. 55-502).
porous paper that is treated with resin to? stiffen the paper
and keep it from becoming limp in the'presence of water.
This annular ?lter element 10 has a plastic upper end
cap 11'and plastic lower end cap 112, and the pleated ele
ment is here shown as protected by a perforated metal
outer wall 13 and a similar inner wall .14. The present
means of sealing, however, is particularly advantageous
when the metal walls 13 and 14 are omitted, and the
This invention relates to novel sealing means at? the ends 10 pleated paper alone must stand the sealing pressure. Each
of a- ?lter cartridge to prevent leakage between such ends
end cap is formed of resilient rubber-like plastic material,
and the parts of a container that engage such ends. This
such as plastisol molded'to shape. The end caps 11 and
application is a continuation-in-part of? US. application
12 each has an outwardly projecting annular ?ange 15
Serial No. 10,647, ?led February 24, 1960, now aban
provided with an annular rib or gasket [16.?
doned.
15
The ?lter cartridge of FIG. 2 is the same as that of
_ The invention pertains primarily to?tubular ?lter car
FIG. 1, except the perforated tubes 13? and 14 are not
tridges in which the ?lter element- is formed. of pleated
shown, and the protruding ?ange 15? and annular gasket
paper,.and.has a sealing end cap at'each end of the pleated
16? are at the inside of the ?lter annulus.
element.
FIG. 3 shows the ?lterv cartridge of FIG. I placed in a
1 The ?lter cartridge of the present invent-ionwas designed 20 ?lter housing of the type that may be connected to the
primarily for use. as anair ?lter but may- be used to ?lter
carburetor of a motor vehicle to supply ?ltered air to the
oil- or. other ?uids.
carburetor and engine. Such housing, as shown, com
Pleated paper ?lter cartridges have been-provided here-to
prises an annular lower wall 17 having the depressed part
fore with molded plastic end caps having one or more
18 and downwardly extending neck 19 for attachment to
sealing ribs or gaskets projecting fromthe outer'face of 25 a-carburetor. Within the neck 19 is secured a bridge bar
the end caps so that these gaskets will form a seal be
20 to which is secured the upwardly extending threaded
tween the ends of the cartridge and? parts of the housing
post 21. After the cartridge is placed upon the lower wall
engaged by these gaskets.
or. ?oor 17, it is held in place by the annular cover 22
Such prior? constructions work- very Well in many cases,
having a central hole to receive the upper end of the post
but these pleated paper cartridges are. not particularly 30 21, and the cover is held in place resting upon the car
strong and'if a relatively high clamping pressure is exerted
tridge by the thumb-nut 23.
on the cartridge to force such gaskets into tight sealing
, It will be noted that in FIG. 3 the ?lter is supported in.
engagement with parts of the housing, the cartridge may
be injuredby such excessive pressure. The di?iculty in
obtaining a tight seal is caused'primarily by distortion in
and variations in the tolerance of the parts forming the
metal housing for the cartridge.
spacedrelation to the floor 17 by the lower gasket 16,
and that the cover 22 is held in spaced relation to the.
cartridge by the upper gasket 16. When the clamping
pressure is increased in FIG. 3 by tightening the thumbnut
23, the protruding outer ?anges 15 are de?ected as shown
The present invention contemplates a novel seal for one
in FIG. 4 and the gaskets 16 seal on the surfaces 17 and
or both ends of the ?lter cartridge. Such seal is secured
22, but as shown there is still some clearance between
by providing one or both ends of the cartridge with a 40 the ends of the cartridge and the housing surfaces 17, 22.
?exible plastic end cap having a protruding annular ?ange
By employing the construction just described, the cover
that will ?ex a substantial amount under pressure. This
22 may be forced downwardly from its position of FIG. 3
?ange has an annular rib or gasket extending from a
to its sealing position of FIG. 4 an amount equal to the
face thereof near its outer periphery. The construction is 45 distance the gasket 16 normally projects upwardly from
such that the ?ange will both ?ex and bend and the gasket
will move bodily and bend under pressure to conform to
a contacting surface and seal thereagainst before any
material compression of the gasket occurs. The sealing is
the face of the end cap 11, without exerting an injurious
pressure on the pleated cartridge. Therefore, if either
metal surface 117 or 22 is distorted or dented, an air-tight
seal can still be secured without exerting an injurious pres?
secured with the exertion of only a minimum pressure on 50 sure on the cartridge. This is due to the construction
the pleated ?lter cartridge.
These features of the present invention will be further
understood from the following description when read in
connection with the accompanying drawing, wherein;
whereby advantage is taken of the ?exing and bending of
the annular ?anges ?15. In order to secure these advan
tages, it is important that the gasket 16 be disposed out
wardly a substantial distance beyond the outer metal Wall
FIG. 1 is a vertical sectional view through a ?lter car 55 13 and pleats 10, so that this projecting ?ange 15 is free
tridge having the sealing means of the present invention.
to ?ex as shown in FIG. 4.
FIG. 2 is a similar view showing the sealing gasket at
In FIG. 5 the ?lter cartridge of FIG. 2 is shown in a
the inside of the annulus rather than at the outside as
metal housing similar to the housing of FIG. 3, so that
in FIG. 1.
the annular gaskets 1'6? engage the base plate 17? and
FIG. 3 is a vertical sectional view through the cartridge 60 cover 22?. When pressure is applied to the cartridge of
of FIG. 1 mounted in a housing, but not under sealing
FIG. 5 by tightening the thumb-nut, the inwardly project
pressure.
ing ?anges 15? will be ?exed as shown. As a result of
FIG. 4 is an enlarged view of parts of ?FIG. 3 with
this ?exing of the ?ange and bending of the ?ange and
sealing pressure applied.
gasket, a tight seal will be secured even if the metal base
FIG. 5 is the same as FIG. 3, except that the sealing 65 and cover are distorted, bent or dented, and this seal is
gasket is at the inside of the annulus; and
secured without exerting an injurious pressure on the
FIG. 6 is an enlarged view of part of FIG. 5 showing
cartridge.
sealing pressure applied.
It will be noted that the ?exible end caps 11 and 12
The pleated ?lter cartridge may be given various shapes
each have only one annular sealing gasket. This is im
and sizes but preferably has the general shape of a tube 70 portant as the sealing pressure causes the ?ange 15 and
or annulus as shown in the drawing.
As shown in FIG. 1, the ?lter cartridge comprises the
gasket 16 to bend under pressure where needed and per
mits the gasket to move bodily and seal against a contact
3,095,290
ing surface. As a result of this construction the sealing
gasket will continue to bend under pressure to conform to
an irregular surface until the plastic end cap 11 ?or 12 con
tacts the adjacent surface 17 or 22. At no time is any sub
stantial pressure exerted on the sealing gasket. If the dis
tance which the gasket projects beyond the ?at face of the
end cap is greater than the maximum irregularities of
such face against which the end cap is to seal, complete
sealing will take place with a minimum amount of ap
at least one of said caps being formed of a resilient rub?
ber-like plastic molded to shape and having a single an
nular ?ange that projects laterally well beyond the circle
de?ned by the folds of the pleats, and having an integral
annular gasket projecting from the outer face of such
?ange and positioned so that the entire gasket lies some
distance from said circle to engage a Wall of such hous
ing, so that when pressure is applied the projecting ?ange
can ?ex and bend to permit the gasket in its entirety to
10 move bodily ?and bend to secure a seal against said wall
plied pressure.
under a minimum end pressure upon the cartridge.
By employing the projecting annular ?ange of the pres
2. A ?lter cartridge constructed to compensate for dis
ent invention, the integral sealing gasket at the outer pe
tortions in and manufacturing variations in the top ?lter
riphery of this ?ange can move bodily and bend to con
engaging wall and bottom ?lter engaging wall of a hous
from to irregularities in the adjacent surface under a mini
mum pressure. It is this ready bending ?of the gasket that 15 ing for such cartridge, comprising a tubular pleated ?lter
medium having a closure cap secured to each end thereof,
produces the tight seal. '
both caps being formed of a resilient rubber-like plastic
It will be seen from the foregoing that the construction
molded to shape and each having a single annular ?ange
of the present invention is well adapted to secure sealing
that projects laterally well beyond the circle de?ned by
on irregular surfaces while exerting a minimum sealing
pressure on the pleated filter, and that the bending ?and 20 the folds of the pleats, and each having an integral an
nular gasket projecting from an outer \face of its ?ange
?exing of the protruding annular ?anges will permit the
?and positioned so that the entire ?gasket lies some distance
annular gasket to ?bend and ?form a tight seal before the
from said circle to engage a wall of such housing, so that
?at face of the end caps 11 and 12 are engaged by the
when pressure is applied the projecting ?ange can ?ex and
end Walls 17, 22.
In prior constructions where the plastic end cap of a 25 bend to permit the ?gasket in its entirety to move bodily
and bend to secure a seal against said walls under a mini
?lter cartridge was provided With a protruding sealing
mum end pressure upon the cartridge.
gasket, the compression of such gasket was relied upon to
effect the seal. In contrast with such prior constructions,
References Cited in the ?le of this patent
the bodily movement of the present ?ange and the bend
ing of the ?ange are relied upon to provide a tight seal 30
UNITED STATES PATENTS
upon the exertion ?of only a slight sealing pressure.
2,732,031
Rabbitt et al ___________ __ Ian. 24, 1956
Having thus described my invention, what I claim and
?2,771,156
Kasten et a1 ___________ __ Nov. 20, 1956
desire to patent by Letters Patent is:
2,871,976
Sebok ________________ __ Feb. 3, 1959
1. A ?lter cartridge constructed to compensate for dis
Pritchard ____________ __ June 13, 1961
tortions in and manufacturing variations in the top ?lter 35 2,988,170
engaging wall or bottom ?lter engaging wall of a hous
FOREIGN PATENTS
ing ?for such cartridge, comprising a tubular pleated ?lter
medium having a closure cap secured to each end thereof,
491,730
Italy ________________ __ Mar. 11, 1954
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