Patent Application
20230146022
The present invention relates to a wrench device for firmly gripping an object such as a container or jar. The invention further relates to a method of using such device for opening the lid of a container or jar.
Numerous devices have been devised for gripping an object such as a container or jar to facilitate opening a lid. The U.S. patent publication No. 2013/0298508, for example, discloses a “strap wrench” that can be applied to either a jar or a jar lid to firmly hold and to apply a torque to open the lid. In one embodiment two strap wrenches are used to allow a user to firmly hold the jar with one hand while applying torque to open the lid with the other.
Other devices for opening the lid of a jar may be found in the following patent references:
CN107176570 for “Bottle Cap Unscrewing Device”;
US20060112792 for “Strap Wrench”;
U.S. Pat. No. 6,425,305 for “Jar Holder”; and
U.S. Pat. No. 5,704,258 for “Bottle Opening Device”.
As evidenced by all of these references, so-called “strap wrench” has been frequently used to hold a container or jar to aid the user in opening the lid. This device was originally designed to grip an industrial object, such as a water pipe or an oil filter, with a relatively wide strap in order to hold or turn the pipe or filter while avoiding scarring, as would occur from the use of a toothed pipe wrench. The wrench's strap is in contact with nearly the entire circumference of the round object, and thus can apply the torsional force received from the handle which serves as a lever and that, depending on its length, multiplies the mechanical advantage.
Strap wrenches are commercially available wherever tools are sold. One such wrench, made by Flui-Pro Products, is the “Heavy-Duty Rubber Strap Wrench with Locking Non-Slip Grip.” This strap wrench has a plastic handle and a strap of sufficient length to surround a six-inch pipe or filter. While both economic and sturdy, this wrench requires some dexterity and manipulation to use because the strap must first be passed around the object to be gripped and then held tightly against the handle by a ratcheting mechanism. To undo the strap the ratcheting mechanism must first be released.
When opening the screw-cap lid of a container, torque must be applied in opposite directions to the lid, on one hand, and to the container on the other. Especially in the case of vacuum-packed food containers, the torque required is significant and, in particular for children and people of advanced age, the lid may be difficult to open.
The aforementioned patent publication No. 2013/0298508 proposes to solve this problem by using a strap wrench attached to the lid (
A principal object of the present invention, therefore, is to provide an improved wrench device for firmly gripping an object, such as a container or jar, which is effective and robust, yet extremely convenient to use.
Another, ancillary object of the present invention is to provide a method of using the improved wrench device to unscrew the lid of a container or jar.
These objects, as well as further objects which will become apparent from the discussion that follows, are achieved by providing a strap wrench device of the type described above that includes:
(a) an elongate, flexible member having a first end and a second end; and
(b) an elongate handle having a proximal end, a distal end, a face side and a back side. The handle is configured to be conveniently held in a user's right hand with its proximal end extending toward the object to be gripped. The proximal end of the handle has a means on its right side (when held by a user with its face side up) for attaching the first end of the flexible member. It also has an opening adjacent the handle's left side through which the flexible member can pass.
The flexible member extends through the opening in the handle, thereby forming a loop that can surround and grip the object. The member then extends further along the left side of the handle toward the handle's distal end.
In accordance with the invention, the handle includes a rounded protrusion at its proximal end, adjacent to the opening and on a side of the opening that is opposite to the flexible member attachment means, for pressing the flexible member against the gripped object when the device is in use.
This protrusion serves as a means for “locking” the flexible member, and preventing slippage of the loop, with respect to the object when the handle is rotated clockwise.
The flexible member is preferably a substantially flat strap, because such would provide a maximum contact area with the object to be gripped. In this case, the opening in the handle is preferably a slit which accommodates the strap with minimum clearance so as to guide and hold the strap in position adjacent the object.
Preferably also, the flexible member has a rubber surface on the side thereof in contact with the object so as to prevent slippage.
In a preferred embodiment of the invention, the rounded protrusion is formed by an elongate hump that extends across the width of the handle, from its face side to its back side. This configuration distributes the force applied to the strap across the width of the strap.
Advantageously, the handle of the wrench device is made of a hard plastic, and the rounded protrusion is made of a different material than the handle, such as metal or rubber, and attached to the plastic handle either during or after the handle is cast in a mold. In this way, the protrusion can be configured to best serve its purpose as an abutment that maintains the strap in position even when a substantial torque force is applied to the wrench during use.
According to another preferred embodiment, the wrench device further comprises a guide member affixed to the handle that extends outward therefrom on the left side thereof, for guiding and retaining the flexible member in close proximity to the handle. The guide member is preferably made of a bent metal rod that is embedded at one end in the plastic material of the handle.
Another aspect of the present invention concerns a method for opening a lid of a container, using the wrench device described above. It is assumed that the lid is substantially round and is screwed on tightly, as is often the case with jars of food. The container may be, but is not necessarily, cylindrical in shape. It may be oval shaped, for instance, or even square.
The present method, which advantageously requires only a single wrench device, comprises the following steps:
(a) Surrounding the container with the flexible member, forming a snug loop around the container;
(b) With the left hand, grasping the container lid tightly between the left thumb and the left forefinger; and
(c) Rotating the wrench device clockwise with the right hand, to rotate the container while firmly holding the lid stationary with the left hand.
In so doing, the rounded protrusion presses against the flexible member, firmly fixing it in position and preventing slippage of the loop with respect to the container while the wrench device is rotated.
For a full understanding of the present invention, reference should now be made to the following detailed description of the preferred embodiments of the invention as illustrated in the accompanying drawings.
The preferred embodiment of the present invention will now be described with reference to
The wrench device according to the invention is shown generally in
Referring to
The device also includes a flexible member 20 (in this case a strap) having a first end 21 and a second end 22. The proximal end of the handle has a means 24 on its right side (as viewed when the device is held by a user with its the face side 18 upward) for attaching the first end of the flexible member. This means may be a rivet (as shown), an eyelet or any common device for “fixing” the first end of the member to the handle.
The flexible member 20 forms a loop and passes through an opening 26, preferably a narrow slit if the member is a flat strap, on the left side of the handle's proximal end. The member 20 then extends further along the left side of the handle toward the handle's distal end 16.
In accordance with the invention, the handle includes a rounded protrusion 28 at its proximal end 14, adjacent to the opening 26 and on the side of the opening that is opposite to the flexible member attachment means 24. This protrusion 28 presses the flexible member tightly against a gripped object when the device is in use, preventing slippage of the member with respect to the object when the handle is rotated clockwise.
The flexible member 20 is preferably a substantially flat strap, because such would provide a maximum contact area with the object to be gripped. In this case, the opening 26 in the handle 12 is preferably a slit which accommodates the strap with minimum clearance so as to guide and hold the strap in position adjacent the object.
Preferably also, the flexible member 20 has a rubber surface on its side that is in contact with the object, so as to maximize friction and minimize slippage.
In the preferred embodiment of the invention, the rounded protrusion 28 is formed by an elongate hump that extends across the width of the handle, from the face side to its back side. This configuration distributes the force applied to the strap across the width of the strap.
Preferably, the handle 12 of the wrench device 10 is made of a hard plastic. The rounded protrusion 28 can be formed integrally with the handle, as is shown in
According to another preferred embodiment of the invention, the wrench device further comprises a guide member 32 affixed to the handle, that extends outward therefrom on its left side, for guiding and retaining the flexible member 20 in close proximity to the handle. The guide member 32 may be made of a bent metal rod, for example, that is embedded and thereby fixed at one end in the plastic handle.
Another aspect of the present invention concerns a method for opening a lid of a container using the wrench device described above. It is assumed that the lid is substantially round and is screwed on tightly, as is often the case with jars of food. The container may be, but is not necessarily, circular in cross-sectional shape. Instead it may be oval shaped, for instance, or even square.
The present method, which advantageously requires only a single wrench device, preferably comprises the following steps:
(a) with the flexible member of the wrench device as described above, forming a snug loop around the container;
(b) grasping the container lid tightly between a left thumb and a left forefinger of the left hand; and
(c) rotating the wrench device clockwise with the right hand, to rotate the container while firmly holding the lid stationary with the left hand.
In so doing, the rounded protrusion presses against the flexible member, firmly fixing it in position and preventing slippage of the flexible member loop with respect to the container as the wrench device is rotated.
The device may be easily removed from the container in an additional, final step by rotating the device counter-clockwise with respect to the container to loosen the flexible member and then slipping the device off the top or bottom of the container.
As shown in
Thanks to the “jamming” of the cap or lid surface into the natural arc of the user's left hand, as compared to the “pulling-away” action if the user tries to rotate the cap counterclockwise with the right hand, the “squeezing” effort by the user to hold the lid tight against rotation with the jar is quite insubstantial and can be easily accomplished by anyone, from the very young to the very old.
The free end of the strap can be held tightly when the wrench device is in use by squeezing it firmly against the handle proper. Such a firm grip on the strap is not necessary, however, because it is pressed against the jar 34 by the round protrusion 28.
In
In
There has thus been shown and described a strap wrench device, as well as a method for opening the lid of a container, both of which fulfill all the objects and advantages sought therefor. Many changes, modifications, variations and other uses and applications of the subject invention will, however, become apparent to those skilled in the art after considering this specification and the accompanying drawings which disclose the preferred embodiments thereof. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention, which is to be limited only by the claims which follow.
This application is a Continuation application of U.S. application Ser. No. 15/906,356, filed on Feb. 27, 2018, which claims priority to and the benefit of U.S. Application 62/614,622, filed Jan. 8, 2018, the disclosures of which are incorporated herein by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62614622 | Jan 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15906356 | Feb 2018 | US |
| Child | 18151179 | US |
