Apparatus for removing a soft stopper from a container

An apparatus for removing a soft stopper such as a cork from a container such as a bottle. The apparatus includes a hollow cylinder having a slit along its length and a handle attached to the top of the cylinder. The interior surface of the cylinder includes a spiral wound thread having a flat upper surface. The cylinder is inserted between the outer circumference of the cork and the interior wall of the bottle and is rotated so that the threads are embedded in the outer wall of the cork and serve to compress the cork inwardly as the apparatus is screwed into the container. A stop ring serves to limit the penetration of the apparatus into the bottle and when the apparatus has reached its maximum penetration, the apparatus begins to force the cork out of the bottle as the turning motion of the cork continues. In an alternative embodiment, the cylinder includes a hinge which permits the two halves of the cylinder to be opened after the cork is removed from the bottle to thereby enable the cork to be removed from the opened cylinder.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to apparatus which are used to remove a soft 
stopper such as the cork from a container such as a bottle of wine. 
2. Description of the Prior Art 
Many liquid containers have stoppers made of cork to prevent spillage 
during transportation and to preserve the liquid contents during prolonged 
storage. For example, alcoholic beverages such as wines are often stored 
in long neck glass bottles which allows the wine to breathe and sometimes 
adds flavor to the wine. To remove the cork, typically a corkscrew is used 
to bore a hole in the middle of the cork to be pulled out of the bottle 
neck. However, there are many disadvantages to the conventional corkscrew 
and there exists a need for a safe and effective tool to grip the cork for 
removal from a bottle. 
The typical corkscrew consists of a long solid screw which is connected to 
a handle usually arranged perpendicular to the longitudinal axis of the 
screw to facilitate the rotational effort by the user's hand in screwing 
the screw into the cork and for pulling the cork out of the bottle. 
Several disadvantages of prior art corkscrews are as follows: 
(1) The screw has a distinct sharp point which can easily puncture or 
lacerate the user or another person; 
(2) There is no structural design to assist the screw to center itself so 
as not to puncture one side of the cork before the entire longitudinal 
length of the cork is transversed for maximum friction between the cork 
and the screw. There is also no structural design to insure that once the 
top of the cork is punctured, (whether at the center of the top surface of 
the cork or not), that the direction of penetration is parallel to the 
central longitudinal axis. The screw is particularly prone to travel in 
several different directions if the user cannot steady his or her hand at 
all times during the screwing motion. When this happens, the cork is 
particularly prone to breakage; 
(3) Even if the center is punctured and the subsequent direction of the 
screw is exactly along the longitudinal axis of the cork, some corks are 
so soft that on pulling, the center of the cork disintegrates and allows 
the screw to come out of the cork without the cork being pulled out of the 
bottle neck; 
(4) Once the cork has a complete bore in the center, there is no way 
another attempt with the same screw will succeed in removal of the cork 
because the threads of the screw no longer can form any tight contact and 
friction with the body of the cork. To retrieve the liquid, one has to 
either push the broken cork into the bottle or break the glass container 
itself, both methods introducing contaminants into the wine; 
(5) The major obstacle to the removal of the cork is the friction between 
the cylindrical surface of the cork and the interior of the bottle neck 
surrounding the cork. To attempt to overcome this friction by using the 
friction between a narrow straight slippery metal screw at the center of 
the cork, in loose contact with the body of a soft screw, is a most 
ineffective approach. This approach tends to break the cork rather than 
overcome the friction between the cork and the bottle neck. 
Therefore, there is a significant need for an improved cork removal 
apparatus which overcomes the disadvantages of the prior art corkscrews. 
SUMMARY OF THE PRESENT INVENTION 
The present invention is an apparatus for removing a soft stopper such as a 
cork or rubber stopper from a container which operates by gripping the 
cork from the circumferential surface toward the center. Through this 
process, a continuous centering and stabilizing mechanism is provided 
which allows less tiring effort and skill from the user. Through use of 
the present invention, the integrity of the cork is preserved while it is 
being pulled out of the bottle neck. The present invention also does not 
create any holes inside the body of the cork as caused by conventional 
corkscrews. This tool is not sharp and the threads of the gripping 
mechanism are directed inward and hidden from the user, whereby the user 
cannot harm himself. The unsymmetrical design of the cross-sectional area 
of the gripping mechanism allows easy insertion of the tool but maximum 
friction with the cork while it is being pulled out. The tool shears the 
cork from the interior surface of the bottle neck, attacking the areas 
where most friction occurs, thus facilitating removal of the cork. 
The invention is new and unique because it can be used on corks, or other 
soft stoppers that are new and untouched as well as on corks that have 
been damaged by conventional corkscrews, with a hole in the center that is 
coming apart. No other tools, including the conventional corkscrew, are 
designed to pull out damaged corks as well as new corks. 
It has been discovered, according to the present invention, that the use of 
a cylindrical object whose diameter is slightly larger that the diameter 
of a cork, or other soft stopper and which contains threads on its 
interior surface enables the apparatus to be inserted between the exterior 
surface of the cork, or other soft stopper and the adjacent interior 
surface of the container into which the cork has been embedded, thereby 
creating a cork removal apparatus which removes the cork by the force of 
the internal threads compressing the cork and driving it out of the 
container, as opposed to puncturing the cork. 
It has further been discovered, according to the present invention, that 
the use of a cylindrical object whose diameter is slightly larger that the 
diameter of a cork, or other soft stopper and which contains threads on 
its interior surface enables the apparatus to compress the cork while 
removing it, thereby enabling the user to utilize the present invention 
with corks that have been damaged and sheared in addition to new corks. 
It has additionally been discovered, according to the present invention, 
that the use of a hinge along the length of the cylindrical object enables 
the object to be opened to thereby facilitate removal of the cork after it 
has been pulled from the bottle. 
It is therefore an object of the present invention to provide a cork, or 
other soft stopper removal apparatus which grips the cork from the 
exterior surface and squeezes it inwardly, thereby resulting in a 
compressive force on the cork. This enables the cork to be removed even if 
it is damaged because of the compressive force instead of the puncturing 
operation created by conventional cork removal corkscrews. 
It is another object of the present invention to provide a cork, or other 
soft stopper removal apparatus which eliminates the sharp point of 
conventional corkscrews, thereby substantially reducing the likelihood of 
injury to the user. 
It is a further object of the present invention to provide a cork, or other 
soft stopper removal apparatus which stabilizes the cork as it is removed 
from its container, thereby reducing the likelihood that the cork will 
break apart during removal. 
Further novel features and other objects of the present invention will 
become apparent from the following detailed description, discussion and 
the appended claims, taken in conjunction with the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Although specific embodiments of the invention will now be described with 
reference to the drawings, it should be understood that such embodiments 
are by way of example only and merely illustrative of but a small number 
of the many possible specific embodiments which can represent applications 
of the principles of the invention. Various changes and modifications 
obvious to one skilled in the art to which the invention pertains are 
deemed to be within the spirit, scope and contemplation of the invention 
as further defined in the appended claims. 
Referring particularly to FIG. 1, the present invention apparatus for 
removing a cork from a container 100 comprises a handle or hand gripping 
means 110 connected through a throat member 160 to a hollow cylindrical 
structure 120. The hollow cylindrical structure 120 has a longer side 112 
and a shorter side 114. The shorter side 114 further comprises a 
longitudinal slit 140. By way of example, the overall length of the 
apparatus 100 may be approximately 12 centimeters and the width of slit 
140 may be approximately 0.2 centimeters. The wall of the cylinder 120 
should be thin, for example approximately 0.1 centimeter or less and made 
of sturdy material such as strong plastic or metal. As illustrated in FIG. 
1, the longer side 112 of the cylinder 120 exceeds the shorter side 114 by 
a distance "X" which by way an example can be approximately 1 centimeter. 
This allows the tip 130 of the cylinder 120 to be pushed into the area 
between the circumferential surface of the cork and the interior of the 
bottle for the purpose of steadying the tool and aligning the center of 
the hollow cylinder 120 with the center of the cork in a direction 
parallel to the longitudinal axis of the cork. The external diameter of 
the cylinder 120 is z (which by way of example may be approximately 2 
centimeters). The slit 140 allows the cylinder 120 to open up upon 
insertion of the tip 130 to wedge part of the cork away from the 
bottleneck and to permit the tool to grip corks which are slightly larger 
than 2 cm in diameter. If the corks are smaller in diameter than 2 cm, 
upon insertion of tip 130 to the contact area between the cork and the 
bottle neck, the cylinder 120 will also accommodate itself to this smaller 
cork. 
For ease of insertion into the area between the external circumferential 
surface of the stopper and the interior surface of the container neck, the 
tip 130 is tapered, with the sharp edge near the external surface of the 
apparatus. Similarly, the edges of the apparatus forming slit 140 along 
the entire length of the slit are tapered with the sharp edges near the 
external surface of the apparatus. 
The cylinder 120 also has a broken ring 150 which is broken at the location 
of the slit 140 to thereby allow the slit 140 to continue uninterrupted. 
The broken ring 150 is fixed on the outer surface of the cylinder 120 at a 
distance of Y from the tip of the cylinder 130. By way of example, the 
distance Y may be approximately 4 centimeters. This ring should be made of 
hard material which has minimal friction with glass or the material making 
the top surface of the bottle neck. Other fancy structures such as ball 
bearings can be fitted here as additional ways to decrease friction 
between the tool and the top surface of the container which surrounds the 
cork. 
Referring to FIGS. 2 and 3, the interior surface 250 of the cylinder 120 
further comprises a spiral wound thread formed into it and extending into 
the interior space of the cylinder 120. As illustrated in FIG. 3, the 
spiral thread 261 starts at the level 260 which is at the level of the 
short length 135 of cylinder 120 and continuous up the interior surface 
250 towards the connecting throat 160 which is narrower than the cylinder 
120 to allow a firm and comfortable grip of the handle 110. The spiral 
direction of the threads 261 can be right-handed or left-handed to suit 
both types of users. 
Referring to FIG. 3, it can be seen that the wedge near the tip 130 of the 
longer length of the cylinder 120 and the tip 135 of the shorter length of 
the cylinder are designed such that the outer surface 240 of the cylinder 
120 is straight and the inner surface 250 is tapered to squeeze the cork 
toward its own center. The squeezing of the cork preserves the intactness 
of the cork so that no broken pieces fall inside the container and also 
increases the friction applied onto the cylindrical surface of the cork. 
The lower end 260 of the thread 261 starts at the level of 135 and winds 
it way up to 320 which is about 2 centimeters beyond the level of the ring 
150. As illustrated in FIG. 3, the threads 261 are not symmetrical in 
cross-section but flat on the top surface 262 to exert maximum pulling 
force on the cork to twist it upwards. 
After the insertion of the tip of the cylinder to wedge between the cork 
and the bottle neck, initial turning motions of the apparatus 100 will 
bring the apparatus 100 down in a direction toward the bottom of the 
container. After about 4 centimeters penetration, the broken ring 150 will 
not allow the cylinder 120 to move further down toward the bottom of the 
container. As the apparatus 100 is screwed into the bottle, the threads 
261 are screwed into the exterior surface of the cork. After the apparatus 
100 has been screwed into the bottle to its maximum penetration (when the 
broken ring 150 reaches the top of the container), further continuous 
turning motion of the cylinder 120 in the same direction will instead 
twist the cork upwards in a direction away from the bottom of the 
container because the flat upper surface 262 of threads 261 will cause the 
cork to be moved upwardly out of the container. This will allow the cork 
to be removed from the bottle or container neck without the right-handed 
user physically holding with the left hand onto the bottle or container 
and trying with the right hand to pull the cork from the bottle or 
container. The left hand merely steadies the bottle or container while the 
right hand turns the apparatus, always in the same direction, which is 
easier to perform and prevents breaking the glass container. The 
connection between the handle 110 and the cylinder 120 at 160 should not 
be thicker than 1 centimeter to allow a comfortable grip between the 
user's second and third fingers while the hand is holding the handle 110. 
As the top of the cork moves from 135 toward 320, the bottom of the cork 
also moves away from 135 towards 320. The distance between 135 and 320 
should be such that when the top of the cork reaches 320, the bottom of 
the cork is so far away from 135 that the lower part of the cylinder 120 
can easily be slid out from the bottle neck. The shaded area of 330 
represents solid material, in contrast to the hollow interior 340 of the 
cylinder 120. 
The preferred embodiment of the present invention as discussed above is 
meant to be a disposable one-time apparatus because the cork will stay 
inside the hollow cylinder 120. Another cork will have to be supplied to 
serve as a stopper if the liquid is not completely used up and needs to be 
further stored. 
The preferred embodiment can therefore be defined as an apparatus for 
removing a cork from a container, comprising: (a) a thin walled hollow 
generally cylindrical body having a first side which is longer than its 
opposite second side thereby terminating in a bottom extending at an 
upward angle from the lower tip of the first side to the lower tip of the 
second side; (b) the top of the thin walled hollow generally cylindrical 
body extending into a neck member whose diameter is narrower than the 
diameter of said thin walled hollow generally cylindrical body; (c) a 
transverse handle member attached to said neck member at a location remote 
from the top of the thin walled hollow generally cylindrical body; (d) a 
longitudinal slit in the wall of said thin walled hollow generally 
cylindrical body extending from the lower tip of the second side for most 
of the length of the body; (e) a fixed broken ring extending around the 
circumference of said thin walled hollow generally cylindrical body at a 
location remote from the bottom of the body, the break in the ring aligned 
with the longitudinal slit in the wall of the thin walled hollow generally 
cylindrical body; and (f) an inwardly extending spiral thread extending 
from the interior surface of said thin walled hollow generally cylindrical 
body and winding from the bottom of the body upwardly beyond the location 
of said broken ring. 
The wall of said thin walled hollow generally cylindrical body is inwardly 
tapered adjacent its bottom. 
The inwardly extending spiral thread further comprises a flat upper 
surface. 
The alternative embodiment of the present invention is illustrated in FIG. 
4. In the alternative apparatus 400, the cork can be removed intact and 
reused. All of the features discussed in the preferred embodiment 
apparatus 100 are also present in the alternative embodiment apparatus 
400. Therefore, the parts are numbered the same. There are two 
modifications which differentiate the alternative apparatus 400. The first 
modification is the addition of a hinge 170 which is located along the 
length of the cylinder 120 at a location exactly opposite to the slit 140. 
The second modification is the addition of moveable collar 180 which fits 
tightly onto the connecting neck 160 and threaded thereon through threads 
171. As illustrated in FIG. 4, the alternative apparatus is divided into 
two halves 410 and 412 which can be separated into the opened position by 
the hinge 170. For the operation of removing the cork from the bottleneck, 
the two halves 410 and 412 are placed together so that the alternative 
apparatus 400 resembles the preferred embodiment apparatus 100 as 
illustrated in FIG. 1 and the collar 180 will be in the down, tight 
fitting position, so that the two halves along the hinge (410, 412 
respectively) will form a hollow cylinder with a narrow slit 140. After 
removal of the cork from the bottleneck as previously described, the cork 
will have moved into the interior of the cylinder 120. To retrieve the 
cork, the collar 180 will be slid upwards, to allow the two halves of the 
cylinder wall, 410 and 412 to open up and expose the cork, which can now 
be picked up easily from the opened cylinder. The hinge should ideally be 
thin and unobstructive to the rotational movement of the cylinder during 
removal of the cork from the bottle neck. Ideally, if the tool is made of 
hard plastic, the hinge will represent a thinned out area in the shape of 
a narrow line which is flexible and durable without breakage even after 
multiple bending and flexing. During operation, the tight fitness between 
the cork and the bottle neck will prevent excessive wobbling of the hinge 
and thus protect it from tearing easily. 
In summary, the present invention is an apparatus for removing a cork, or 
other soft stopper from a container such as a bottle. The apparatus 
includes a hollow cylinder having a split along its length and a handle 
attached to the top of the cylinder. The interior surface of the cylinder 
includes a spiral wound thread having a flat upper surface. The cylinder 
is inserted between the outer circumference of the cork and the interior 
wall of the bottle and is rotated so that the threads are embedded in the 
outer wall of the cork, or other soft stopper and serve to compress the 
cork inwardly as the apparatus is screwed into the container. A stop ring 
serves to limit the penetration of the apparatus into the bottle and when 
the apparatus has reached its maximum penetration, the apparatus begins to 
force the cork out of the bottle as the turning motion of the cork 
continues in the same direction. In an alternative embodiment, the 
cylinder includes a hinge which permits the two halves of the cylinder to 
be opened after the cork is removed from the bottle to thereby enable the 
cork to be removed from the opened cylinder. 
The alternative embodiment of the present invention can be defined as an 
apparatus for removing a cork, or other soft stopper from a container, 
comprising: (a) a two piece thin walled hollow generally cylindrical body 
longitudinally divided in half and each half connected by a hinge forming 
a generally cylindrical shape when the two halves are placed together; (b) 
said two piece thin walled hollow generally cylindrical body having a 
first side which is longer than its opposite second side thereby 
terminating in a bottom extending at an upward angle from the lower tip of 
the first side to the lower tip of the second side; (c) the top of the two 
piece thin walled hollow generally cylindrical body extending into a neck 
member whose diameter is narrower than the diameter of said two piece thin 
hollow generally cylindrical body; (d) a transverse handle member attached 
to said neck member at a location remote from the top of the two piece 
thin walled hollow generally cylindrical body; (e) a longitudinal slit in 
the wall of said two piece thin walled hollow generally cylindrical body 
extending from the lower tip of the second side for most of the length of 
the body; (f) a longitudinal hinge in the wall of said two piece thin 
walled hollow generally cylindrical body extending from the lower tip of 
the first side for the entire length of the body to enable the two pieces 
to be rotated relative to one another by the longitudinal hinge; (g) a 
fixed broken ring extending around the circumference of said two piece 
thin walled hollow generally cylindrical body at a location remote from 
the bottom of the body, one break in the ring aligned with the 
longitudinal slit in the wall of the two piece thin walled hollow 
generally cylindrical body and a second break in the ring to allow opening 
of the two pieces along said longitudinal hinge; (h) a slidable collar 
located on said neck member for retaining the two halves of the two piece 
thin walled hollow generally cylindrical body together; and (i) an 
inwardly extending spiral thread extending from the interior surface of 
said two piece thin walled hollow generally cylindrical body and winding 
from the bottom of the body upwardly beyond the location of said broken 
ring. 
Of course, the present invention is not intended to be restricted to any 
particular form or arrangement, or any specific embodiment disclosed 
herein, or any specific use, since the same may be modified in various 
particulars or relations without departing from the spirit or scope of the 
claimed invention hereinabove shown and described of which the apparatus 
shown is intended only for illustration and for disclosure of an operative 
embodiment and not to show all of the various forms of modification in 
which the invention might be embodied or operated. 
The invention has been described in considerable detail in order to comply 
with the patent laws by providing full public disclosure of at least one 
of its forms. However, such detailed description is not intended in any 
way to limit the broad features or principles of the invention, or the 
scope of patent monopoly to be granted.