U.S. patent number 3,910,550 [Application Number 05/469,692] was granted by the patent office on 1975-10-07 for drain plug assembly.
This patent grant is currently assigned to Illinois Tool Works Inc.. Invention is credited to John Frederick Nelson.
United States Patent |
3,910,550 |
Nelson |
October 7, 1975 |
**Please see images for:
( Certificate of Correction ) ** |
Drain plug assembly
Abstract
The embodiment of the invention disclosed herein is directed to
a drain plug assembly for insertion into the wall of a fluid
container such as the radiator of an automobile. The drain plug
assembly has a molded plastic body member which receives a molded
plastic stem member and has an arrangement to provide an assembly
which is inserted into an aperture formed in an embossment in the
wall of the container and snap-locked in place. The body member of
the drain plug has spaced apart walls which are urged toward one
another during insertion of the drain plug assembly into the
aperture of the container receiving the same. The spaced apart
walls of the body member are maintained in an outwardly diverging
configuration by a shoulder forming an annular abutment on the stem
member when the stem member is threadedly tightened into the body
member.
Inventors: |
Nelson; John Frederick (Richton
Park, IL) |
Assignee: |
Illinois Tool Works Inc.
(Chicago, IL)
|
Family
ID: |
23864737 |
Appl.
No.: |
05/469,692 |
Filed: |
May 13, 1974 |
Current U.S.
Class: |
251/144; 184/1.5;
251/217 |
Current CPC
Class: |
F01P
11/0276 (20130101) |
Current International
Class: |
F01P
11/02 (20060101); F01P 11/00 (20060101); B65D
041/04 () |
Field of
Search: |
;251/144,217
;285/194,162 ;220/38.5,39R,288 ;85/DIG.2,32K,32.1 ;184/1.5
;137/351 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Cline; William R.
Attorney, Agent or Firm: Olson, Trexler, Wolters, Bushnell
& Fosse, Ltd.
Claims
The invention is claimed as follows:
1. A drain plug assembly for connection to a fluid container
comprising: an embossment forming a recess in a wall surface of the
said container, said recess including a base and a continuous
sidewall having a predetermined height, an aperture formed in said
base, a body member having a pair of spaced apart portions joined
together at one end thereof and slot means extending from adjacent
said one end to the other end of said spaced apart portions, first
shoulder means formed on said spaced apart portions intermediate
the ends thereof, second shoulder means formed at said other end of
said spaced apart portions and cooperable with said first shoulder
means to firmly hold said body portion within said aperture formed
in said embossment and with said second shoulder means having an
axial extent equal to or less than said predetermined height to
maintain said second shoulder means totally within said recess and
below the wall surface of said container, said spaced apart
portions adapted for resilient movement toward one another during
insertion of said body member into said aperture, a stem member
having an elongated shaft to be inserted into said body member
between said spaced apart portions, fastener means formed on said
elongated shaft and in said body member to provide a locking action
therebetween when said stem member is tightened to said body
member, a head portion formed at an exterior end of said elongated
shaft, said head portion providing an area radially outwardly of
said shaft to completely overlie said apertured recess and engage
the wall surface about said recess to form a seal thereabout when
said stem member is tightened to said body member, whereby
untightening of said stem from said body member will disengage said
head portion from the wall surface about said recess and fluid from
within said container will flow from between said slot means of
said body member and said shaft.
2. In the drain plug assembly for connection to the wall of a fluid
container as set forth in claim 1, wherein said head portion
includes a resilient seal element positioned about said shaft to
provide a seal between said head portion and the wall surface about
said recess.
3. In the drain plug assembly for connection to the wall of a fluid
container as set forth in claim 2, wherein said resilient seal is a
washer-like member having an aperture to receive said shaft, and a
plurality of ribs formed on said shaft adjacent said head portion
to provide minimum contact area between said shaft and said
washer-like member, whereby said washer-like member will remain
substantially stationary when in contact with said wall surface
during tightening of said stem member.
4. In the drain plug assembly for connection to the wall of a fluid
contained as set forth in claim 3, said plurality of ribs defining
a plurality of voids between adjacent ribs, said voids having a
volume sufficient to accept the volume of said washer-like member
which is readily expanded into said voids when the washer-like
member is compressed between the wall of said fluid container and
said head.
5. In the drain plug assembly for connection to the wall of a fluid
container as set forth in claim 1, wherein said spaced apart
portions are joined together with a predetermined thickness of
material, a slot formed within said shaft at the end opposite said
head portion, transversely outwardly directed shoulder means formed
on said shaft adjacent said slot, an opening formed within said
body through the material joining said spaced apart portions
together, said shoulders of said shaft being urged through said
opening during assembly of said drain plug, and said shoulders on
said shaft retaining said stem member within said body member when
they are loosened.
6. In the drain plug assembly for connection to the wall of a fluid
container as set forth in claim 5, wherein female threads are
formed in said opening and male threads are formed on said shaft so
that said member is threadedly tightened toward said body member to
urge said head portion against the wall adjacent said aperture.
7. In the drain plug assembly for connection to the wall of fluid
container as set forth in claim 6, wherein said material joining
said spaced apart portions together is of a predetermined
thickness, said male threads on said shaft being spaced from said
shoulder means at the end of said shaft a distance at least equal
to said predetermined distance to allow said threads to completely
disengage and said shoulder means to retain said stem member within
said body member.
8. In the drain plug assembly for connection to the wall of a fluid
container as set forth in claim 7 wherein said shaft has a reduced
diameter portion adjacent the threaded portion thereof toward the
head portion to allow collapsing of said spaced apart portions of
said body member during insertion of said drain plug assembly into
said aperture of the fluid container receiving the same.
9. In the drain plug assembly for connection to the wall of a fluid
container as set forth in claim 8, further including an enlarged
diameter portion immediately adjacent to said reduced diameter
portion and adjacent said head portion to provide an abutment
surface against said other end of said spaced apart portions to
maintain said first and second shoulder means of said spaced apart
portions in firm engagement with the periphery of said aperture
when said stem member is firmly tightened within said body
member.
10. In the drain plug assembly for connection to the wall of a
fluid container as set forth in claim 1, wherein said body member
is substantially rectangular in configuration to fit within a
rectangular aperture, thereby preventing rotation of said body
member during tightening and loosening of said stem member.
11. In the drain plug assembly for connection to the wall of a
fluid container as set forth in claim 1, wherein said first
shoulder means are provided with sloping forward edges relative to
a plane passing through said second shoulder means to provide a
gradually diminishing space between the locking surface edges of
said first and second shoulder means to accommodate different
thicknesses of wall material forming the fluid container.
12. In the drain plug assembly for connection to the wall of a
fluid container as set forth in claim 1, wherein said head portion
is provided with tab means for hand manipulation during tightening
and loosening of said stem member.
13. In the drain plug assembly for connection to the wall of a
fluid container as set forth in claim 1, wherein said embossment is
directed inwardly of the container.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to improvements in the structure
and apparatus used primarily in the field of fluid containers, and
more particularly to a drain plug assembly and its combination with
such containers that provide substantial useful improvements over
existing drain plug arrangements which are now commonly used in the
automotive field. The drain plug assembly of this invention has
particular utility when used in conjunction with automobile
radiators. However, it will be understood that while the invention
is directed primarily to a drain plug assembly for use with
automobile radiators, the specific device disclosed herein can be
used in other allied fields, such as drain plugs for chemical
containers and the like.
Heretofore, drain plug assemblies formed at the bottom of
automobile radiators have been of the type which are either silver
soldered or brazed directly to the metal which forms the bottom
tray or end cap for the radiator core. These drain plug assemblies
are provided with a hollow threaded shaft through which extends a
stem member having a seat portion to engage the inner peripheral
edge of the threaded tube. When the stem is loosened, by rotation
of wing-like members well-known in the art, the water or other
coolant liquid within the radiator will be drained.
The operation of connecting the prior art drain plug assemblies to
the radiator is relatively expensive and time consuming. It
requires the use of a skilled operator for brazing or silver
soldering the drain plug assembly to the radiator bottom pan.
Furthermore, the drain plug assembly is required to be formed of
either cast or forged metal having substantially the same
characteristics as the metal forming the radiator so they can be
joined together by silver soldering or brazing. The high cost of
silver solder and braze rod also adds to the overall cost of
forming drain plugs on radiators in this manner.
SUMMARY OF THE INVENTION
Accordingly, an object of this invention is to provide a new and
improved drain plug assembly which can be fastened to a radiator of
an automobile without the need of silver solder or brazing.
Another object of this invention is to provide a new and improved
drain plug assembly which can be fastened to automobile radiator
assemblies by merely inserting the plug assembly into an aperture
formed in the radiator, this being accomplished readily by
non-skilled labor.
Another object of this invention is to provide a new and improved
drain plug assembly which provides an improved seal about the drain
plug opening and which will withstand the increased pressure within
its associated container as a result of the high temperature of the
fluid therein.
Still another object of this invention is to provide a new and
improved drain plug assembly and an embossment configuration on the
wall portion of the container receiving the same that is highly
efficient in maintaining the container in a sealed condition until
such time as the drain plug is opened.
Yet another object of this invention is to provide a drain plug
assembly wherein the body portion of the drain plug and the stem
portion thereof are maintained in an assembled condition even when
the stem portion is fully unthreaded from the body portion for
draining of liquid from within its associated container.
Many other objects, features and advantages of this invention will
be more fully realized and understood from the following detailed
description when taken in conjunction with the accompanying
drawings wherein like reference numerals throughout the various
views of the drawings are intended to designate similar elements or
components.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective exploded view of a drain plug assembly and
a portion of fluid container configurated to cooperate therewith
and constructed in accordance with the principles of this
invention;
FIG. 2 is a side elevational view of the drain plug assembly of
FIG. 1 further illustrating the various aspects of the
invention;
FIG. 3 illustrates the drain plug assembly fully inserted into the
aperture within the wall of the fluid container and further
illustrates the head portion forming a seal about the periphery of
the aperture;
FIG. 4 illustrates the drain plug assembly in an opened condition
to allow fluid from within the container to the drain;
FIG. 5 is an end view of the drain plug assembly of this invention
illustrating the tab portions formed on the head to facilitate hand
manipulation of tightening and loosening of the stem member;
FIG. 6 is a side sectional view taken along line 6--6 of FIG.
5;
FIG. 7 illustrates the drain plug assembly of this invention with
the body portion thereof somewhat collapsed in the area of a
reduced diameter portion of the stem member which facilitates
insertion of the body portion into the aperture formed in the
container receiving the same;
FIG. 8 is an end view of the stem member of the drain plug assembly
of this invention;
FIG. 9 is an end sectional view taken along line 9--9 of FIG. 7
illustrating the ribbed portion of the stem to provide minimum
contact with the inner periphery of the washer forming the seal at
the head portion;
FIG. 10 is an end view of the body portion of the drain plug
assembly of this invention;
FIG. 11 is a sectional view taken along line 11--11 of FIG. 10;
FIG. 12 is a side view of the body portion of the drain plug
assembly of this invention; and
FIG. 13 is an end view of the body member as viewed from the end
having the threaded opening therein to receive the stem member.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
Referring now to FIGS. 1 and 2, there is seen a drain plug assembly
constructed in accordance with the principles of this invention and
is designated generally by reference numeral 10. The drain plug
assembly 10 includes a body member 11, cooperable with a stem
member 12 and insertable into an aperture 13. The aperture 13, most
advantageously, is formed in an embossment 14 of a wall portion 16
which is part of a fluid container, not here illustrated in its
entirety. The fluid container may be a radiator of an automobile,
it being understood that other types of containers can utilize the
drain plug assembly of this invention. The embossment 14 is formed
by an inwardly directed portion 17 thereby providing a flat wall
surface 18 on the outside of the container immediately adjacent the
embossment and which cooperates with the stem member 12 to form a
fluid tight seal about the aperture 13.
The body member 11 has spaced apart wall-like portions 20 and 21
joined together by material 22 at one end thereof and spaced apart
by slot means 23. The other end 24 of the wall portions 20 and 21
are readily resiliently urged toward one another by pressing
together. Preferably, the body member 11 and stem member 12 are of
molded plastic material of a type suitable to withstand high
temperatures and provide substantial strength while still
maintaining a slight degree of resiliency to allow the wall
portions to be urged together. One such type of plastic material is
PLASKON 8233.
Extending outwardly from the wall portions 20 and 21 are first
shoulder means 26 and 27, respectively, which have forwardly
directed inclined leading edges 26a and 27a. Second shoulder means
28 are formed at the terminating end 24 of the wall portions and
cooperate with first shoulder means to lock the body member in
position within the aperture as best seen in FIG. 3. The body
member 11 is inserted into the aperture 13 after the stem member 12
has been assembled thereto. However, the body member 11 may be
inserted into the aperture 13 first and thereafter the stem member
12 may be inserted into the body member 11.
The body member 11 has an opening 30 formed at the tied together
end, which opening is provided with threads to receive
corresponding threads 31 formed on a shaft 32 of the stem member
12. While a threaded engagement between the body member 11 and stem
member 12 is illustrated, it will be understood that other
fastening and unfastening connections may be incorporated such as
quarter-turn cam lock configurations, or the like.
The stem member 12 has the shaft portion 32 thereof provided with a
slot 33 at one end. Directed transversely outwardly of the slot 33
are shoulder portions 34 which are urged together when passing
through the opening 30 and thereafter spread apart to retain the
stem member in engagement with the body member even after being
threadedly disconnected therefrom. The material holding the wall
portions together is of a predetermined thickness as indicated by
the letter D. To insure complete threaded disengagement of the stem
member, a corresponding thickness D' is maintained between the
shoulder portion 34 and the beginning of the threads 31. The
distance D' is at least equal to or greater than the distance
D.
To facilitate inserting the assembled drain plug into the aperture
13, the shaft 32 is provided with a reduced diameter portion 36 so
that the end 24 of the body portion can be squeezed together, as
indicated in FIG. 7. Immediately adjacent the reduced diameter
portion is an enlarged diameter shoulder portion 37 which then is
urged against the inner periphery of the wall portions 20 and 21,
as best seen in FIG. 6, to maintain the shoulders 26 and 27,
together with the shoulder means 28, in an outwardly urged
condition so that the drain plug will not dislodge or loosen from
the aperture under the influence of high pressure within the
radiator or other container at elevated temperatures.
To insure a long life seal engagement with the wall surface about
the embossment 14, a resilient washer-like member 40 is positioned
immediately adjacent a head portion 41 formed at the other end of
the stem member 12. The washer member 40 is formed of material such
as rubber, neoprene, or other suitable deformable and non-hardening
material. The head portion 41 is provided with a tab member 42 to
be grasped by the hand and threadedly turned during tightening and
loosening.
As best seen in FIG. 4, when the drain plug assembly is opened,
fluid from within the container passes through the slot means 23
and about the shaft member 32. To insure that the washer-like
member does not rotate during the final tightening operation as it
is being urged firmly against the peripheral surface of the wall
portion 18, a plurality of rib elements 46 are formed immediately
adjacent the enlarged diameter portion 37. These ribs provide
minimum contact with the washer. While four ribs are here
illustrated, three ribs may be formed if desired.
What has been described is a simple, inexpensive and efficient
drain plug assembly for insertion into an aperture formed in an
embossment on a wall portion of a container. Variations and
modifications of the illustrated invention may be made without
departing from the spirit and scope of the novel concepts disclosed
and claimed herein.
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