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Claims  |
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What is claimed is:
1. A replaceable filter canister for a permanently installed filter head of
a type having first and second ports in fluid communication with a
cylindrical chamber having an interior surface which is intended to
receive said filter canister, said filter canister comprising:
a flask shaped housing having a main body with a top surface;
a cylindrical neck projecting from said top surface, said neck being
intended to be slidably received and rotatable in said cylindrical chamber
of said head, said neck having an external cylindrical surface and an
internal surface, said external cylindrical surface having an external
diameter which is approximately uniform over the entire height of said
neck;
tube means for conveying fluid, said tube means disposed in said housing
and said neck, said tube means having an upper part extending into said
neck and a lower part in sealed fluid communication with said upper part
and extending into said housing, the external cross-sectional area of said
upper part of said tube means being smaller than the adjacent internal
cross-sectional area of said internal surface of said neck proximate
thereto to define a clearance therebetween;
filter means for filtering fluid, said filter means disposed in said
housing and adapted around said lower part of said tube means, one part of
said filter means being in sealed fluid communication with said clearance
and another part of said filter means being in sealed fluid communication
with said lower part of said tube means;
a first seal disposed circumferentially in and around said external
cylindrical surface of said neck and proximate the upper distal end
thereof, said first seal intended to make slidable sealable contact with
said interior surface of said cylindrical chamber of said head;
a first space bounded in part by said first seal and said external
cylindrical surface of said neck above said first seal, and when said
cylindrical chamber of said head has received said canister bounded in
part by said interior surface of said cylindrical chamber, such that one
of said first and second ports in said head is in sealed fluid
communication with said first space;
a second seal disposed circumferentially in and around said external
cylindrical surface of said neck and disposed below said first seal, said
second seal intended to make slidable sealable contact with said interior
surface of said cylindrical chamber of said head;
a second space bounded in part by said first and second seals and said
external cylindrical surface of said neck between said first and second
seals, and when said cylindrical chamber of said head has received said
canister bounded in part by said interior surface of said cylindrical
chamber, such that the other one of said first and second ports in said
head is in sealed fluid communication with said second space;
a first opening into said canister through said neck in sealed fluid
communication with said clearance and one of said first and second spaces;
and
a second opening into said canister through said neck in sealed fluid
communication with said upper part of said tube means and the other one of
said first and second spaces,
wherein one of said first and second openings into said canister is located
above said first seal and is in sealed fluid communication with said first
space,
wherein the other one of said first and second openings is located below
said first seal and above said second seal and extends radially inwardly
from said external cylindrical surface of said neck and is in sealed fluid
communication with said second space, and
whereby fluid directed at one of said first and second spaces will flow
into said canister through said clearance, thence into said filter means,
thence into said tube means, and thence out of said canister into the
other one of said first and second spaces.
2. The canister of claim 1, wherein said first opening into said canister
through said neck is located above said first seal on said neck and is in
sealed fluid communication with said first space, and
wherein said second opening into said canister through said neck is located
below said first seal and above said second seal on said neck and is in
sealed fluid communication with said second space,
whereby fluid directed at said first space will flow into said canister
through said clearance and out of said canister through said tube means
into said second space.
3. The canister of claim 1, wherein said first opening into said canister
through said neck is located below said first seal and above said second
seal on said neck and is in sealed fluid communication with said second
space, and
wherein second opening into said canister through said neck is located
above said first seal on said neck and is in sealed fluid communications
with said first space,
whereby fluid directed at said second space will flow into said canister
through said clearance and out of said canister through said tube means
into said first space.
4. The canister of claim 1, further comprising securing means for securing
said canister to said head.
5. A filter apparatus comprising:
a head intended to be permanently installed in a machine, said head having
a bottom side and a top portion.
a cylindrical chamber having an interior surface formed in said top portion
and accessible from said bottom side,
and first and second ports into said cylindrical chamber accessible through
said top portion of said head; and
a replacement filter canister for said head having
a flask shaped housing having a main body with a top surface,
a cylindrical neck projecting from said top surface, said neck being
intended to be slidably received and rotatable in said cylindrical chamber
of said head, said neck having an external cylindrical surface and an
internal surface, said external cylindrical surface having an external
diameter which is approximately uniform over the entire height of said
neck,
tube means for conveying fluid, said tube means disposed in said housing
and said neck, said tube means having an upper part extending into said
neck and lower part in sealed fluid communication with said upper part and
extending into said housing, the external cross-sectional area of said
upper part of said tube means being smaller than the adjacent internal
cross-sectional area of said internal surface of said neck proximate
thereto to define a clearance therebetween,
filter means for filtering fluid, said filter means disposed in said
housing and adapted around said lower part of said tube means, one part of
said filter means being sealed fluid communication with said clearance and
another part of said filter means being in sealed fluid communication with
said lower part of said tube means,
a first seal disposed circumferentially in and around said external
cylindrical surface of said neck and proximate the upper distal end
thereof, said first seal intended to make slidable sealable contact with
said interior surface of said cylindrical chamber of said head,
a first space bounded in part by said first seal and said external
cylindrical surface of said neck above said first seal, and when said
cylindrical chamber of said head has received said canister bounded in
part by said interior surface of said cylindrical chamber, such that one
of said first and second ports in said head is in sealed fluid
communication with said first space,
a second seal disposed circumferentially in and around said external
cylindrical surface of said neck and disposed below said first seal, said
second seal intended to make slidable sealable contact with said interior
surface of said cylindrical chamber of said head,
a second space bounded in part by said first and second seals and said
external cylindrical surface of said neck between said first and second
seals and when said cylindrical chamber of said head has received said
canister bounded in part by said interior surface of said cylindrical
chamber, such that the other one of said first and second ports in said
head is in sealed fluid communication with said second space,
a first opening into said canister through said neck in sealed fluid
communication with said clearance and one of said first and second spaces,
and
a second opening into said canister through said neck in sealed fluid
communication with said upper part of said tube means and the other one of
said first and second spaces,
wherein one of said first and second openings into said canister is located
above said first seal and is in fluid communication with said first space,
wherein the other one of said first and second openings is located below
said first seal and above said second seal and extends radially inwardly
from said external cylindrical surface of said neck and is in sealed fluid
communication with said second space; and
securing means for securing said canister to said head, whereby when said
canister is secured to said head said first port is in sealed fluid
communication with one of said first and second spaces and said second
port is in sealed fluid communication with the other one of said first and
second spaces, and fluid directed at one of said first and second ports
will flow into said head, thence into said canister through said
clearance, thence into said filter means, thence into said tube means,
thence out of said canister into the other one of said first and second
ports, and thence out of said head.
6. The apparatus of claim 5, wherein said first opening into said canister
through said neck is located above said first seal on said neck and is in
sealed fluid communication with said first space, and
wherein said second opening into said canister through said neck is located
below said first seal and above said second seal on said neck and is in
sealed fluid communication with said second space,
whereby fluid directed at said first port in said head will flow into said
canister through said first space and thence said clearance and out of
said canister through said tube means, thence into said second space, and
thence out of said head through said second port.
7. The apparatus of claim 5, wherein said first opening into said canister
through said neck is located below said first seal and above said second
seal on said neck and is in sealed fluid communication with said second
space, and
wherein second opening into said canister through said neck is located
above said first seal on said neck and is in sealed fluid communication
with said first space,
whereby fluid directed at said first port in said head will flow into said
canister through said second space, thence into said clearance, and out of
said canister through said tube means, thence into said first space, and
thence out of said head through said second port.
8. A filter apparatus comprising:
a head intended to be permanently installed in a machine, said head having
a bottom side and a top portion,
a cylindrical chamber having an interior surface formed in said top portion
and accessible from said bottom side,
and first and second ports into said cylindrical chamber accessible through
said top portion of said head; and
a replacement filter canister for said head having
a flask shaped housing having a main body with a top surface,
a cylindrical neck of substantially uniform diameter projecting from said
top surface of said housing, said substantially uniform diameter defining
a cylindrical surface, said neck having an internal surface, said neck
being operable for being slidably received in said cylindrical chamber of
said head,
a tube disposed in said housing and extending into said neck, the
cross-sectional area of said tube being smaller than the internal
cross-sectional area of said internal surface of said neck to define a
clearance therebetween, said clearance being sealed adjacent the upper
distal end of said tube and the upper distal end of said neck,
a first seal disposed circumferentially in and around said neck and
proximate its upper distal end,
a second seal disposed circumferentially in and around said neck below said
first seal,
at least one opening into the interior of said canister located between
said first seal and said second seal, said opening extending radially
inwardly from said cylindrical surface of said neck to said clearance,
said first and second seals being operable for making slidable sealable
contact with said interior surface of said cylindrical chamber of said
head such that one of said first and second ports of said head is in
sealed fluid communication with the interior of said canister through said
tube and wherein the other one of said first and second ports of said head
is in sealed fluid communication with the interior of said canister
through said at least one opening into said canister,
means for filtering disposed in said main body of said housing below said
top surface thereof, and
means for securing said canister to said head,
whereby when said neck of said canister is slidably received by said
cylindrical chamber of said head and said canister is secured to said head
by said means for securing, fluid directed at one of said first and second
ports of said head will flow into said at least one opening in said neck,
thence into said canister through said clearance between said neck and
said tube, flow through said means for filtering, thence flow out of said
canister through said tube, and thence flow out of said head through the
other one of said first and second ports of said head.
9. A replacement filter canister for a permanently installed filter head of
a type having inlet and outlet ports in fluid communication with a
cylindrical chamber which is intended to receive said filter canister,
said filter canister comprising:
a flask shaped housing having a main body with a top surface and a
cylindrical neck projecting from said top surface, said neck having a top,
an external cylindrical surface which is intended to be slidably received
and rotatable in said cylindrical chamber of said head, and an internal
surface, said neck having an external diameter which is approximately
uniform over the entire height of said neck from said top surface of said
main body to said top of said neck;
a tube means for conveying fluids, said tube means being disposed in said
housing and having an upper part extending into said neck and lower part
in sealed fluid communication with said upper part and extending below
said neck, the cross-sectional area of said upper part of said tube means
being smaller than the internal cross-sectional area of said internal
surface of said neck proximate thereto to define a clearance therebetween,
said clearance being in sealed fluid communication with a first opening
extending from said top of said neck to said clearance;
a first seal disposed circumferentially in and around said external
cylindrical surface of said neck and proximate to and below said top of
said neck, said first seal making slidable sealable contact with the
interior surface of said cylindrical chamber of said head such that one of
said inlet and outlet ports in said head is in sealed fluid communication
with the interior of said canister through said first opening, and a first
space bounded in part by said first seal and the part of said neck above
said first seal and in part by said cylindrical chamber of said head;
a second seal disposed circumferentially in and around said external
cylindrical surface of said neck and below said first seal, and at least
one second opening into the interior of said canister which is located
between said first seal and said second seal, said at least one second
opening extending radially inwardly from said external cylindrical surface
of said neck, such that the other one of said inlet and outlet ports of
said head is in sealed fluid communication with the interior of said
canister through a second space bounded in part by said first and second
seals and said external cylindrical surface of said neck and in part by
said cylindrical surface of said head, and through said at least one
second opening into the interior of said canister;
means for filtering disposed in said housing, whereby fluid directed at
said first opening will flow into said canister through said clearance
between said neck and said upper part of said tube means, thence flow
through said means for filtering, thence flow through said tube means and
thence flow out of said canister through said at least one second opening;
and
means for securing said canister to said head.
10. A filter apparatus comprising:
a multihead intended to be permanently installed in a machine, said
multihead having
a bottom side and a top portion,
a series of at least two separate and spaced apart upstanding cylindrical
chambers formed in said top portion and accessible from said bottom side,
thereby providing at least a first and a last in a series of said chambers
in said multihead, each chamber being operable for receiving a replacement
filter canister,
an inlet port into said first in a series of said chambers accessible
through said top portion of said multihead,
an outlet port into said last in a series of said chambers accessible
through said tip portion of said multihead, and
a passageway in sealed fluid communication between each series-adjacent
chamber, the number of said passageways being equal to the number of said
chambers minus one;
a replacement filter canister for each of said chambers of said multihead
each of said canisters having
a flask housing having a main body with a top surface,
a cylindrical neck projecting from said top surface, said neck being
intended to be slidably received and rotatable in said chamber intended
therefor of said multihead, said neck having an external cylindrical
surface and an internal surface, said external cylindrical surface having
an external diameter which is approximately uniform over the entire height
of said neck,
tube means for conveying fluid, said tube means disposed in said housing
and said neck, said tube means having an upper part extending into said
neck and a lower part in sealed fluid communication with said upper part
and extending into said housing, the external cross-sectional area of said
upper part of said tube means being smaller than the adjacent internal
cross-sectional area of said internal surface of said neck proximate
thereto to define a clearance therebetween,
filter means for filtering fluid, said filter means disposed in said
housing and adapted around said lower part of said tube means, one part of
said filter means being in sealed fluid communication with said clearance
and another part of said filter means being in sealed fluid communication
with said lower part of said tube means,
a first seal disposed circumferentially in and around said external
cylindrical surface of said neck and proximate the upper distal end
thereof, said first seal intended to make slidable sealable contact with
said interior surface of said cylindrical chamber intended therefor of
said multihead,
a first space bounded in part by said first seal and said external
cylindrical surface of said neck above said first seal, and bounded in
part by said interior surface of said chamber intended for said canister,
a second seal disposed circumferentially in and around said external
cylindrical surface of said neck and disposed below said first seal, said
second seal intended to make slidable sealable contact with said interior
surface of said chamber intended therefor of said multihead,
a second space bounded in part by said first and second seals and said
external cylindrical surface of said neck between said first and second
seals, and bounded in part by said interi | | |
