U.S. patent number 3,802,001 [Application Number 05/228,723] was granted by the patent office on 1974-04-09 for basket assemblies for sink strainers.
This patent grant is currently assigned to Premier Tool & Die Limited. Invention is credited to William Thomas Richards.
United States Patent |
3,802,001 |
Richards |
April 9, 1974 |
BASKET ASSEMBLIES FOR SINK STRAINERS
Abstract
A basket assembly for a sink strainer characterized in that the
lower end of the stem of the basket constitutes a pilot element to
project through a slot or opening in the partition in the strainer
body and the stem is provided with thread means above the pilot
element, the root diameter of the thread means being less and the
maximum diameter being greater than the minimum dimension or width
of the partition opening or slot and the axial spacing of adjoining
thread portions being greater than the thickness of the partition,
the arrangement being such that the thread means constitutes on the
one hand, a ledge formation adapted to support the basket assembly
on the partition in its open position clear of its seat and on the
other hand a screw feed means co-operating with the partition to
positively advance the basket assembly to a closed position against
its seat.
Inventors: |
Richards; William Thomas
(Toronto, Ontario, CA) |
Assignee: |
Premier Tool & Die Limited
(Toronto, Ontario, CA)
|
Family
ID: |
22858342 |
Appl.
No.: |
05/228,723 |
Filed: |
February 23, 1972 |
Current U.S.
Class: |
4/287; 4/286 |
Current CPC
Class: |
E03C
1/262 (20130101) |
Current International
Class: |
E03C
1/26 (20060101); E03C 1/262 (20060101); E03c
001/262 () |
Field of
Search: |
;4/286,287,288 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Wilhite; Billy J.
Assistant Examiner: Massenberg; Donald B.
Claims
I claim:
1. A basket assembly comprising a basket for a sink strainer
wherein the basket assembly is adapted to be received in a well in
a strainer body member mounted in the bottom of a sink and in
communication with a substantially vertical sink drain sleeve, the
basket assembly having a downwardly extending stem adapted for
co-operation with a perforated substantially horizontal partition
adjacent the bottom of the strainer body wherein in one
relationship the stem supports the basket assembly on the partition
in an open position clear of a seat provided in the body for
draining of the sink and in another position the stem projects
through a slot in the partition to cause the basket assembly to
seat against the body seat to prevent draining of the sink,
characterized in that the stem of said basket assembly is provided
with thread means thereon terminating short of the lower end of
said stem, the lower end of said stem forming a pilot adapted to
extend through the partition opening with said basket assembly in
its open position, said thread means having an outer thread
diameter greater and a root diameter less than the width of the
partition slot and a pitch such that the spacing of adjoining
threads is greater than the thickness of the partition, and said
thread means comprising a double thread, said double thread
presenting thread portions lying generally in a plane substantially
perpendicular to the stem axis and on opposite sides thereof, said
thread portions constituting on the one hand a ledge formation
adapted to support said basket assembly on the partition in its
open position with said pilot projecting through said partition
slot and on the other hand a screw feed means to co-operate with
opposing edges of the partition slot to enable said basket assembly
to be positively advanced on rotation thereof to its closed
position against the body seat, a portion of said double thread
extending beyond said partition where said thread portions which
are adjacent the underside of said partition are in contact
therewith when said basket assembly is in said closed position.
2. A basket assembly as claimed in claim 1 in which said basket
assembly is provided with a compressible gasket on the underside
thereof adapted to engage the seat formed on a strainer body member
and to be compressed into intimate sealing contact therewith under
positive advance of said basket assembly by said screw thread means
regardless of any play between said thread means and said slot edge
and of any displacement of said stem relative to the center of the
length of said slot.
3. A basket assembly as claimed in claim 2 in which said stem
projects upwardly to adjacent the upper surface of said basket
assembly and is provided with a handle thereon.
4. A basket assembly as claimed in claim 2 in which said thread
means comprises a pair of threads disposed in 180.degree. relation,
the axial separation of adjoining thread portions being greater
than the thickness of the partition, said pair of threads
presenting on opposite sides of the stem axis thread portions lying
generally in a plane perpendicular to the stem axis, said thread
portions constituting said ledge means.
5. A basket assembly for co-operation with a sink strainer having a
slotted partition comprising a basket, a longitudinal stem
projecting downwardly from said basket, said stem having double
threads formed thereon, said threads terminating at substantially
diametrically opposed points adjacent the lower end of said stem,
the terminal portions of said threads projecting outwardly from
said stem to provide support ledges disposed on opposite sides of
and lying generally in a common plane perpendicular to the
longitudinal axis of the stem, said stem extending as an unthreaded
pilot projection below said support ledges and adapted to project
through a slot in a strainer body partition with said support
ledges resting on opposed sides of the width of the slot, said
threads having a root diameter less and an outer diameter greater
than the width of the slot of a strainer body partition with which
it is adapted to co-operate and an axial spacing of adjoining
thread portions greater than the thickness of such partition and
when said basket assembly is in closed position in said sink
strainer, a portion of said double thread extends beyond said
partition where diametrically opposed portions of said double
thread which are adjacent the underside of said partition are in
contact therewith.
6. A basket assembly as claimed in claim 5 in which said basket
assembly is provided with a compressible seat on the underside
thereof adapted to engage the seat formed on a strainer body member
and to be compressed into intimate sealing contact therewith under
positive advance of said basket assembly by said double
threads.
7. A basket assembly as claimed in claim 6 in which said stem
projects upwardly to adjacent the upper surface of said basket
assembly and is provided with a handle thereon.
8. A basket assembly as claimed in claim 7 in which said handle
comprises a bar projecting through a bore extending through said
stem adjacent the upper end thereof and perpendicular to the stem
axis, said bar having flattened ends on opposite sides of said stem
bore.
Description
FIELD OF INVENTION
This invention relates to improvements in sink strainers and more
particularly to basket assemblies therefor.
BACKGROUND OF INVENTION
The usual sink strainer comprises a body which is mounted in the
sink drain opening and this body is in the form of a well at the
bottom of which is a seat against which the basket assembly is
adapted to seat. Below the basket seat there is a partition which
is normally provided centrally with an elongated slot surrounded by
a plurality of drain openings. The basket assembly is usually
provided with a stem the lower end of which is shaped to correspond
to the slot so that when it is in registration with the slot it
will drop therethrough allowing the basket assembly to drop down
against the strainer body.
In any other relative orientation of the stem and the slot the
basket assembly will be prevented from dropping down on its seat
and will allow water to freely drain away through the drain
openings in the partition.
With such conventional basket assembly arrangements the operator
must hunt blindly to register the stem with the slot in order to
enable the basket to drop down on the strainer body in order to
close the drain opening. This operation is particularly difficult
if the hands of the operator are wet or soapy as the means of
manipulating the basket assembly is simply a small diameter head on
the stem. Also manipulation is rendered difficult if there are any
obstructions in the sink such as dishes or the like.
Even a more serious disadvantage of the present basket assemblies
is that the sealing of the sink is at best minimal because reliance
is simply made on the weight of the basket resting on the body seat
with the result that invariably drainage occurs and over a period
of time the sink will usually completely drain. Occasionally also
when water is being run into the sink the basket stem will
inadvertently be placed in registration with the slot and the
basket will drop on its seat. If the person at the sink should then
leave the sink the sink will overflow with the consequent water
damage.
SUMMARY OF INVENTION
An important object of the present invention is to provide a basket
assembly which can be used with the standard strainer body without
modification thereof and which will eliminate the above recited
disadvantages of the present conventional basket assemblies. More
particularly it is an object of the invention to provide a basket
assembly which can be operated to seal or drain the sink without
the blind hunting operation presently required in attempting to
orient the stem with the slot.
Another and important object is to enable a positive seal to be
achieved between the basket assembly and the strainer body to
preclude undesired loss of water from the sink while at the same
time requiring a positive action of the operator to effect such
seal so that the sink is not inadvertently prevented from
draining.
Still another object is to provide a basket assembly which can be
much more conveniently and securely gripped than existing basket
assemblies. Again it is an object to provide a basket assembly as
aforesaid which will be of economical construction.
According to the invention the basket assembly is provided with a
stem having thread means formed thereon the inner or root diameter
of which is less than the smallest dimension of the partition
opening, i.e. the width of the partition slot and the outer
diameter of which is greater than such dimension and the axial
spacing of adjoining threads is greater than the thickness of the
partition. Further, the stem is provided with a pilot extension
below the thread adapted to project through such partition opening,
the thread means constituting on the one hand a ledge formation
adapted to support the basket assembly on the partition in its open
position and on the other hand a screw feed means to cooperate with
opposing edges of the partition opening to enable the basket
assembly to be positively advanced on rotation thereof to its
closed position against the body seat.
Further according to the invention the basket assembly is provided
with a compressible ring on the underside thereof adapted to be
positively drawn into seating engagement by the thread means and
placed under compression to effect a complete sink seal regardless
of any play between the thread means and the co-operating edges of
the partition opening or any off-center relationship of the stem in
the partition slot.
Further according to the preferred form of the invention the stem
is provided with a double thread with the diametrically opposed
portions of the opposing threads forming ledge means on opposite
sides of the stem axis lying generally in a plane prependicular to
the stem axis.
Further according to the invention to facilitate rotation of the
threaded stem and basket assembly the stem is provided with a
winged handle of a very simple form attached to the spindle in a
very simple manner.
These and other objects and features of the invention will be
understood with reference to the following detailed description,
taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a basket assembly
embodying the invention ready to be assembled into a conventional
strainer body partly broken away.
FIG. 2 is a mid vertical sectional view of the basket assembly of
FIG. 1 showing its stem spigot projected through the slot in the
strainer body and the thread ledges resting on the partition at
each side of the slot holding the basket assembly in its upper sink
draining position.
FIG. 3 is a broken away part vertical sectional part elevation view
showing the basket assembly clamped in sink sealing position under
a positive seal applied by threading the spindle down through the
slot in the body partition.
FIG. 4 is a broken away underside plan view of the basket assembly
illustrating the double thread arrangement on the stem.
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1 there is shown the usual strainer body 1
commonly found in existing sink installations. Such strainer body
comprises a well 2 depending from a flange 3, the well terminating
in a seat 4 at the entrance to a cylindrical extension 5 at the
lower end of which is a partition 6 having a centrally disposed
elongated slot 7 surrounded by a series of enlarged drain openings
8. The partition body is adapted to be mounted in a sink (not
shown) being supported by the flange 3 from the bottom wall of the
sink and with the well 2 projecting through the sink drain opening.
The connection between the strainer body 1 and the drainpipe (not
shown) is accomplished by a suitable fitting such as the sleeve 9
which may, if desired, be threaded in the usual manner.
The basket assembly of the invention generally designated as at 10
has the usual basket 11 which is adapted to fit down into the well
2 in the strainer body. This basket is provided with the usual
perforations 12 and the function of the basket is to collect waste
in the sink while allowing the water to drain through the
perforations 12 and through the partition openings 8.
Extending through the centre of the basket 11 is a stem generally
designated at 13 having an enlarged upper end 14 forming a shoulder
15 to seat against the bottom of the basket. The reduced lower end
16 extends through a central opening in the basket indicated at 17
and sleeved on the stem end 16 is an inverted cup shaped washer 18
having an outwardly extending flange 19, beneath which is clamped
an annular resilient sealing washer or gasket 20 formed of neoprene
or similar material, the members 18 and 20 being secured on the
stem by a flange 20' formed on the stem 16.
The lower end of the stem portion 16 is provided with a thread
formation generally designated at 21 in the form of a double thread
comprising thread form 22a commencing at one side of the axis of
the stem as indicated in FIG. 4 and a corresponding thread form 22b
starting at a point diametrically opposite to the thread 22a with
corresponding portions of the threads lying generally in a plane
perpendicular to the stem axis. The terminii 23a and 23b of the
threads 22a and 22b may be bevelled as illustrated at FIG. 4 to
assist downward starting movement of the basket assembly in the
sealing of the sink as hereinafter more fully described.
The upper end 14 of the stem 13 is provided with a transverse bore
24 therethrough, through which is projected a round bar 25 which
has its ends flattened as at 26 to form a wing-shaped handle, the
flattened ends 26 providing convenient gripping members and
additionally anchoring the bar 25 in the bore 24. It is understood
that a further example of a gripping means is provided by
flattening the upper end 14 of the stem. This flattening of the
upper end results in two flat surfaces which are substantially
broader than the diameter of the stem 13 thereby providing suitable
gripping means to which sufficient force may be applied to turn the
basket assembly 10.
In the operation of the strainer body the terminii 23a and 23b of
the threads 22a and 22b form ledge means lying generally in a
common plane perpendicular to and on opposite sides of the stem
axis to engage the sides of the slot 7 in the partition 6. It will
be understood that in addition to such terminii 23a and 23b, all
similarly corresponding thread portions will constitute ledge means
as the stem is advanced through the slot. It will also be noted
that the threads 22a and 22b terminate short of the lower end of
the stem and this lower end constitutes a pilot extension 28 of a
diameter less than the width of the slot 7 so that it can project
through the slot.
The diameter of this pilot extension 28 corresponds to the root
diameter of the threads 22a and 22b which root diameter is of a
dimension less than the minimum dimension of the partition opening,
i.e. less than the width of the slot 7, so that the threaded
portion of the stem can be advanced through the slot on rotation
thereof. On the other hand the outside diameter of the threads 22a
and 22b is greater than such minimum partition opening dimension,
i.e. greater than the width of the slot 7, so that the threads form
ledge means blocking advance of the stem axially through the slot
unless the stem is rotated. The pitch of the threads 22a and 22b of
course is such that the axial separation of adjacent thread
portions is sufficient to accommodate the thickness of the
partition 6 with sufficient clearance to allow limited tilting of
the stem relative to the slot.
With the basket assembly resting on the ledge formation presented
by the thread terminii 23a and 23b, the basket is held in an
upright position with the annular washer or gasket 20 clear of the
strainer body seat 4. In this position the water can run down
beneath the basket and through the cylindrical extension 5 of the
strainer body and out the drain openings 8. Larger pieces of waste
will at the same time be collected in the basket, but the basket
can drain through the perforations 12.
The basket assembly is at this point free to be lifted out of the
well and dumped. When it is desired to seal off the sink, the
operator simply grips the handle end 26, rotates the stem to cause
the thread formation 21 to advance the basket assembly downwardly
until the sealing ring formed by the washer or gasket 20 is drawn
into firm compressed seating relation on the strainer body seat 4
as seen in FIG. 3. The net result is that a completely positive
seal is achieved which precludes any unwanted drainage of the
sink.
The basket assembly can be released at any time simply by reversing
the direction of rotation of the stem 13 to move it to or toward
its position illustrated in FIG. 2.
It may be that the basket assembly after having been removed to
discard the collected waste is placed back in the well 2 off centre
so that the pilot 28 is towards one end of the slot with the basket
assembly slightly tilted. Rotation of the stem however will still
cause the basket assembly to be advanced downwardly with its start
facilitated by the bevelled ends 23a and 23b of the threads 22a and
22b, and the compressibility of the gasket 20 will accommodate any
off centre relationship by displacing under compression to snugly
fit completely around the seat 4.
While the basket assembly of the invention has been shown used in
association with a strainer body having a slot in the bottom
partitions, the invention will be equally applicable where the
partition has a central circular or other shaped opening. In each
case the root diameter of the thread will be such as to be less
than the minimum dimension of the partition opening while the
threads themselves will have a diameter greater than such dimension
and the clearance between adjoining threads will be such as to
accommodate the partition thickness with sufficient clearance to
allow for any slight deviation of the stem from a vertical position
as it is advanced through the central opening.
While the preferred embodiment of the invention has been shown, it
will be understood that a single thread could be used or for that
matter, three threads could be used and other variations may be
made without departing from the spirit of the invention or scope of
the appended claims.
* * * * *