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Патент USA US3021542

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Feb. 20, 1962
Filed Dec. 14, 1960
4/ {1/ 16
a! 1'
657M156; 5. 67’06'6‘
“M16 W
Patented Feb. 20., 1962
men-t of an operating handle (not shown). The body
portion 10 is generally cup-shaped as is usual in the art
and is constructed of the usual rubber or similar resilient
material. The threaded socket 13 is provided with extra
heavy threads generally designated as 14 to receive the
corresponding extra heavy engaging threads on end of
operating handle (not shown). By utilization of the
extra heavy threads 14, I have found it unnecessary to use
Stanley B. Gross, 135 S. 2nd St., Philadelphia, Pa.
Filed Dec. 14, 1960, Ser. No. 75,324
2 Claims. (Cl. 4—-255)
My invention relates to new and useful improvements in
force cups and more particularly to the type of force cup
wherein a ?exible guide or skirt extends beyond the body
a clamp as is common in many force cups as the instant
construction now permits use even for the heaviest duty
without the handle tearing the socket 13 or working or
Various shapes and forms of force cups have been de
vised and all have been used with only more or less limited
breaking loose.
success. Some have proved inadequate in that the operat
In its preferred form of construction, the force cup
comprises a substantially spherical, cup-shaped body por
ing handle either worked loose or tore or broke the ma
terial comprising the top of the force cup. Others proved 15 tion 10 terminating in a wide, open mouth 15 and having
inadequate in that they held an insuf?cient supply of air
annular ?ange 16 integral with and extending from outside
and were therefore unable to produce su?icient pressure to
face 17 of body portion 10. The bottom of force cup
force obstructions and the like from clogged drain pipes.
body portion 10 terminates in a horizontal plane with
Still others often turned inside out during normal usage
substantially ?at horizontal bottom surface 18. Coex
thereby making corrections by hand a necessity. Another 20 tending and horizontally juxtapositioned from bottom sur
source of di?'iculty in many prior art devices arose from
face 1% is the bottom surface 19 of annular ?ange 16
their inability to be adaptable to clear obstructions in
which terminates in the same horizontal plane.
drain pipes of various sizes and shapes.
As best seen in PEG. 1, I have provided a series of re
Accordingly, it is an object of this invention to provide
inforcing ribs 2G, 21, 22, 23, 24, 25 spaced equidistant
a force cup of new and improved design.
25 about the outer face 17 of force cup body 10.
Another object of .my invention is to provide a force
cup construction incorporating sturdy construction for co
operation with an operating handle.
A further object of the invention is to provide a force
cup of rugged construction that will maintain normal 30
shape after operation.
Still another object of my invention is to provide a force
cup construction arranged to hold a greater supply of air.
Another object of my invention is to provide a force
cup construction that will produce higher operating pres 35
sures to assure that drain line obstructions are dislodged.
The re
inforcing ribs extend respectively from the shank portion
11 and terminate at points designated 26, 27, 28, 29, 3t},
31 above annular ?ange 16. The ribs are formed integ
rally with force cup body 10 and can be made of the same
material. By incorporating said reinforcing ribs, 2t), 21,
22, 23, ‘24, 25, I ?nd I have provided a force cup that
provides greater suction with less effort than is possible
using prior art force cups and the reinforcing ribs further
cooperate to urge the force cup body portion 10 to return
to normal initial position as shown in FIG. 3 and FIG. 4
after each use or ?exing. I have found that reinforcing
Still another object of my invention is to provide a force
ribs assure trouble free operation whereby undesirable
cup construction readily adaptable to ?t a variety of drain
corrections by hand are never required.
sizes and shapes.
A ?exible skirt portion generally designated as 32 of
A further object of the invention is to provide a force 40 concave contour designed to conform to the shape of the
cup construction of design to prevent back splashing and to
entrance path to the average water closet trap is attached
increase e?iciency.
at its top connecting surface 33 to both bottom surface
A further object of the invention is to provide a force
18 of force cup body portion 10 and bottom surface 1d
cup construction of four seal design providing increased
of annular flange 16. The ?exible skirt may be ?exed to
pressure and dependability.
either of two positions depending on the nature of the use
Other objects and a fuller understanding of the inven
desired. The extended position 34 shown in FIG. v3v may
tion will be had by referring to the following description
be used when clearing obstructions in a water closet trap
and claims of a preferred embodiment thereof, taken in
and the retracted position 35 shown in FIG. 4 may be
conjunction with the accompanying drawing, in which:
used when clearing obstructions in a sink or basin trap or
FIGURE 1 is a plan view of a force cup-embodying my 50 in a ?oor drain. I prefer to construct the ?exible skirt of
the same material as the force cup- body portion 10 but
FIGURE 2 is a bottom view of the force cup.
having thinner side walls as required for e?icient opera
tion. However, any material having satisfactory ?exing
FIGURE 3 is a longitudinal sectional view of the de
qualities that can be bonded to the bottom surface of force
vice of FIGURE 1 taken along section 1-1 in the direc
tion of the arrows.
55 cup 18 and bottom surface of ?ange 19 may be employed.
A plurality of raised water seal rings 36, 37, 3-8 are
FIGURE 4 is a side elevation of the force cup partly
broken away showing skirt in position forming a double
Similar elements are designated by similar reference
characters throughout.
vertically spaced outwardly from outer surface 39 of
?exible skirt 32 and are bonded to the skirt or are in
tegrally formed therewith. When in the extended posi
60 tion 34, the water seal rings engage the surface of the
entrance path to the bowl or trap (not shown) to be
Referring now to FIGS. 3 and 4 of the drawing, I show
cleared by use of the force cup and form a tight seal
a force cup body portion generally designated as It} having
thereby preventing loss of pressure, minimizing back
an integral shank portion 11 above and terminating in an
splashing and thereby accordingly increasing ef?ciency.
annular ?ange 16 below. A ?exible skirt 32 is attached
The action of the water seal rings against the water closet
to and extends from bottom 18 of force cup body portion 65 structure forms a ?rst seal of my four seal force cup con
10 and coplanar bottom surface 19 of annular ?ange 16
to either extended position 34 as shown in FIG. 3 or to
When in the inward or retracted position 35, the ?exi
retracted position 35 as shown in FIG. 4.
ble skirt 32 retracts and extends within body portion 10.
The integral shank portion 11 is centrally positioned 70 I have designed the skirt so that the bottom edge 40
above force cup body portion 10 and is provided with an
touches or engages the inner surface 41 of body portion 10
opening 12 forming a threaded socket 13 for the engage
at sealing surface 42 forming a second seal. The seating
of the skirt 32 on inner surface 41 prevents the skirt from
popping out to the extended position 34 during use when
the upper portion of skirt 44 will then engage and seal
the water closet bowl upon operation of the handle in
the conventional manner thereby dislodging the obstruc
It will be seen that this invention provides a simple and
effective apparatus for relieving almost any degree of stop
page in a drain or trap. Since certain changes in carrying
not desired, thereby assuring safe and sanitary operation
of the force cup without the undesirable need to manually
reset the skirt during operation. The air cushion 49 thus
formed between the inner surface 41 of the body portion
10 and the inner surface 50 of the ?exible skirt 32 causes
extra heavy suction during operation to dislodge obstruc
tions in remote places.
When in the inward or retracted position 35, a third
sealing surface 43 comprising the upper portion 44 of
outer surface 39 is formed in sealing cooperation with the
upper surface of the basin, sink, ?oor, etc. (not shown)
incorporating the obstructed device (also not shown) to
out the above process, and certain modi?cations in the ar
ticle which embody the invention may be made without
departing from its scope, it is intended that all matter
contained in the above description or shown in the ac
companying drawing shall be interpreted as illustrative
and not in a limiting sense.
I claim:
1. In a force cup designed to‘clear obstructions in both
be cleared by use of the force cup. In retracted position 15
Water closet bowls and conventional drains, the combina
35, the uppermost water seal ring 36 is so positioned on
tion of a cup-shaped body portion having a closed top, an
?exible skirt 32 that it extends downward beyond the
outer face, an inner surface, and a large open bottom
third sealing surface 43 a distance 45 equal to its height
terminating in a horizontal plane; an integral shank por
46 thereby forming a fourth sealing surface 4'7. As can
be readily seen, when the force cup is used in the retracted 20 tion centrally positioned above closed top and provided
with an opening forming a threaded socket and provided
position 35, the fourth seal is ?rst formed by water seal
with extra heavy threads; a horizontal annular ?ange in
ring 36 engaging the surface of the appliance to be cleared.
tegral with and extending outward from said outer face
When pressure is applied to the handle, third sealing sur
of body portion and having a ?at bottom surface, said
face 43 also seals ‘to the surface of the appliance. At the
same time, second sealing surface 42 operates and the 25 annular ?ange being horizontally juxtapositioned and co
extending from said open bottom and said ?at bottom sur
three seals combine to give anti-splash, high pressure, triple
face of annular ?ange terminating in the same horizontal
seal operation.
plane as the said open bottom of body portion; a gen
I prefer to design the width of combined sealing sur
erally concave ?exible skirt having an outer surface, a
faces 43, 47 designated herein as 48 approximately one
and one-half inches, a width much greater than is provided 30 connecting end and a sealing end, attached to said bottom
of body portion and to said ?at bottom surface of annular
in the conventional force cup now in use. The extra wide
?ange at said connecting end, said ?exible skirt having a
surface gives superior performance on hard to reach
?rst extended position and a second ‘retracted position, said
drains and the wide surface also prevents slipping and
sealing end making circumferential contact with said inner
In order to operate the device to remove an obstruc 35 surface of body portion when in retracted position, Where
by a second seal is formed; a plurality of longitudinally
tion from a trap mounted in a ?at surface such as a sink,
basin, ?oor, etc., the ?exible skirt 32 ‘should ?rst be moved
to the retracted position 35. Second sealing surface 42
immediately engages and is ready for use without further
effort. The combined sealing surfaces 48 are then placed
upon the basin, sink, etc. and the force cup so positioned
as to be directly above the clogged drain and concentric
therewith. Pressure should be applied to the operating
spaced, raised sealing rings bonded to said outer surface of
?exible skirt said sealing rings extending outwardly from
said outer surface of ?exible skirt and said sealing rings
contacting said water closet bowls and conventional drains,
whereby back-splash of water is discouraged; and a ?rst
seal formed by one or more of said sealing rings engaging
and sealing against said water closet bowl when skirt is
handle in one or more rapid pumping strokes causing the
in the extended position.
sealing surfaces to operate and the force cup body portion 45
2. In the force cup of claim 1, a second seal formed by
the engagement of said sealing end of ?exible skirt with
the said inner surface of body portion when skirt is in re
10 to alternately be compressed and then return to normal
position thereby dislodging the obstruction as in conven
tracted position and a third seal formed by one of said
tional force cups. Upon release of the depressing force
sealing rings and said drain when skirt is in the retracted
upon the operating handle, the inherent resiliency of the
‘body portion 10 together with the urging force of the re 50 position.
inforcing ribs, tends to return said body portion to the
References Cited in the ?le of this patent
shape thereof as illustrated in FIG. 1.
When the surface in question is not ?at such as in the
usual water closet bowl, the operation of the device is
Hodges ______________ __ Nov. 8, 1949
somewhat different. In this case, the ?exible skirt 32 55 2,487,709
Robinson _____________ __. Jan. 3, 1956
should be moved to outward position 34 and the skirt in
serted into the trap of the water closet as far as it will con
veniently pass. The water sealing rings 36, 37, 38 and
Bass _________________ __ June 2, 1959
Patent No, 3,021,532
February 20, 1962
Stanley B, Gross
It is hereby certified that error appears in the above numbered pat
out requiring correction and that the said Letters Patent should read as
corrected below.
Column 4, lines 55 to 5'7, strike out
Hodges ———————— ——Nov. 8, 1949
Robinson —————— —-Jana 3, 1956
Bass —————————— ——June 2, 1959
and insert instead
2, 203, 185
Reeves ————————————— ——Sept.
Simon?———————————— ——May
Hribar ———————————— —-May
Walus —————————————— -—June
Cheiten ——————————— -—July
Signed and sealed this 17th day of November 1964.
Attesting Officer
Commissioner of Patents
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