This invention pertains generally to tools, such as hand operated tools, and, more particularly to such tools used for removing fasteners such as bolts and nuts.
It is common for a worker to be faced with a situation where a nut or other securing or fastening device that is to be removed has, over time, or due to exposure to corrosive elements, become rusted or otherwise too tightly affixed to a bolt or an underlying surface. The typical first approach to this situation is to attempt to use a conventional wrench, such as a socket, box, or adjustable wrench, to remove the rusted nut. This approach often fails, as rust or other corrosion that has formed on the nut often distorts the shape and size of the nut, thereby preventing proper seating of a conventional sized wrench on the nut. Furthermore, it is common for nuts exposed to environmental conditions to become corroded and deteriorate such that the edges of the nut become weak. When a conventional wrench is attempted to be used to remove such a nut, the edges of the nut may strip off, thereby preventing any further attempt to remove the nut with a conventional wrench. At this point, after the wrenches have failed to obtain an adequate grip about the nut, the worker may resort to using pliers to remove the nut. This typically results in further stripping of the edges of the nut, as it is very difficult to obtain adequate gripping force on the nut with pliers. Furthermore, access to the nut to be removed may be limited, thereby further preventing the use of pliers.
What is desired, therefore, is a device for removing nuts, bolts, and similar fasteners that may be used to obtain a sufficiently strong grip on a fastener such that a fastener that is fixed in place and distorted in size and shape by time and corrosion may be removed more readily.
The present invention provides a grasping tool for grasping and removing variously sized nuts and other securing devices. A grasping tool in accordance with the present invention provides substantially uniform pressure on all sides of an object to be removed (such as a nut) such that the applied pressure increases as increased rotational force is applied to the device. The substantially uniform pressure provided by a grasping tool in accordance with the present invention provides a secure grip on a nut sufficient to allow the nut to be removed readily without depending on the integrity of the side ridges of the nut. Thus, a grasping tool in accordance with the present invention facilitates the removal of nuts and similar securing devices which may be rusted, corroded, or otherwise deformed by the elements, or by the use of other tools to remove the securing device.
A grasping tool in accordance with the present invention includes a series of elongated fingers arranged radially in a group and mounted for longitudinal movement in a sleeve. A nut or other fastener to be removed is placed between ends of the fingers extending from the sleeve. As the sleeve is moved toward the nut or other fastener the wall of the sleeve pushes the ends of the fingers inward, to grasp firmly the nut or other fastener to be removed. Various structures and methods may be used to move the sleeve over the fingers and to rotate the grasping tool once attached firmly to the nut or other structure to remove the nut or other structure.
The objects and advantages of the invention will appear more fully from the following detailed description of the preferred embodiment of the invention made in conjunction with the accompanying drawings.
The present invention will now be described in detail with reference to the drawing figures, which illustrate various embodiments of the invention. It should be noted that similar elements and structures having the same functionality in the various illustrated embodiments will be referred to in the drawings using the same reference numerals. It should also be noted that all of the components illustrated in the drawing figures are not necessarily presented to scale, but are illustrated in a manner to facilitate illustration and understanding. Finally, dimensions are not provided for any of the components described and illustrated herein. It should be understood that a grasping tool in accordance with the present invention may be made in any convenient size, depending upon the size of the nuts or other fasteners to be removed using the tool. Unless otherwise noted, all of the components of a grasping tool in accordance with the present invention may be made and assembled using conventional manufacturing techniques and of any appropriate material, such as steel.
A first exemplary embodiment of a grasping tool 30 in accordance with the present invention is depicted in
Various components of the grasping tool 30 are illustrated in the exploded perspective view of
The fingers 32 are inserted into the sleeve 42 along with the ring 40 and the bolt 32. The bolt head 34 is situated inside the series of fingers 38 and seated against the indentation 62 thereon. The threaded end 36 of the bolt 32 is inserted through the aperture 46 through the sleeve 42 and the adjusting nut 44 atop the sleeve 42, and through the central aperture of the socket 48, and is threaded into the end of the bottom portion 54 of the end piece 50. The bolt head 34 thus engages each of the fingers 38 longitudinally, such that when the bolt 32 is threaded upwardly into the end piece 50 (by rotating the end piece 50 with a conventional socket driver while the socket 48 is disengaged from the adjusting nut 44), the fingers 38 will be pulled into the sleeve 42, causing the bottom ends of the fingers 38 to push against the inside of the sleeve and close inward about a nut to be removed. This creates a relatively uniform pressure around the nut.
Once the nut is secured within the fingers 38, the socket 48 is pushed down to engage the adjusting nut 44 and the end piece 50 simultaneously. Additional rotational force applied to the end piece 52 (e.g., by the socket driver) will rotate the entire grasping tool 30, now firmly attached to the nut, resulting in the nut being turned.
After the nut has been removed, rotating the end piece 50 in the opposite direction will result in the bolt head 34 and fingers 38 being pushed downward, forcing the grasping portion 58 of the fingers 38 out of the sleeve 42 and apart, thereby releasing the nut.
Another exemplary embodiment of a grasping tool 70 in accordance with the present invention is depicted in
To remove a nut (or another type of fastening device), the bottom portion of the fingers 38 are placed around the nut and the adjusting nut 72 atop the sleeve 42 is rotated, drawing the threaded bolt 32 upwards through the top portion of the sleeve 42. As the bolt head 34 and engaged fingers 38 are pulled farther inside the sleeve 42, the bottom portion of the fingers 38 move inward, thereby causing the fingers 38 to close in around the nut. Additional rotational force on the adjusting nut 72 will rotate the entire grasping tool 70 that is now secured to the nut, thereby also rotating the nut.
After the nut has been removed from its secured position, the nut is removed from the grasping tool 70 by loosening the adjusting nut 72, thereby allowing the bolt head 34 and finger assembly 38 to slide downward from the sleeve 42. As the fingers 38 exit the sleeve 42, the bottom portion of the fingers 38 move apart, and the loosened nut may be removed from the grasping tool 70.
A further embodiment of a grasping tool 80 in accordance with the present invention, using a different method of opening and closing the fingers, is illustrated in
A further exemplary embodiment 100 of the present invention, having additional desirable features, will now be described with reference to
The grasping portion 102 of this embodiment 100 of the present invention features a finger assembly 106. The finger assembly 106 includes fingers 108 for grasping a nut, as described previously, as well as a finger support structure 110. As illustrated best in
The fingers 108 are positioned with respect to the support structure 110 so as to reside in the grooves 111, with one finger 108 in each groove. The length of the fingers 108 is such that the ends of the fingers 108 that are to grasp a nut, bolt, or other fastener 112 (see
The finger assembly 106 is mounted in the sleeve 113 in the manner described previously. A compression spring 114 may be provided, as described above, between the assembly 106 and the top of the sleeve 113, to push the assembly 106 downward to facilitate removal of a nut from the grasp of the fingers 108.
A threaded bolt 115 extends upward through the finger assembly 106 and through a hole in the top of the sleeve 111 and through a lever plate 116 attached at the top of the sleeve. The threaded end of the bolt 115 is attached to a cap piece 118 mounted at the top of the lever plate 116. The cap piece 118 may have a conventional socket structure formed in the top thereof to facilitate the mounting of the lever portion 104 to the grasping portion 102. Note that appropriate bearing structures 119 may be positioned at the top of the sleeve 113 in the grasping portion 102 to facilitate ratchet action when the grasping portion is rotated via the lever portion 104 to remove a nut, bolt, or other fastener 112 to which it is attached.
The lever portion 104 includes a pivot structure 120. Operation of a locking plier like structure 122 about the pivot structure 120 operates a lever 124, the end of which is adjacent to the lever plate 116, to push the sleeve 113 forward toward the ends of the fingers 108, thereby bringing the ends of the fingers 108 together to grasp firmly a bolt 112 or other structure to be removed. The locking structure locks the fingers 108 in this grasping position. The lever structure 104 may then be rotated to remove the nut, bolt, or other structure 112.
It is contemplated that the aforementioned components may be sized to accommodate varying size nuts and other types of fasteners. A very large size for industrial applications is contemplated along with a very small and portable device for light duty applications. The grasping portion of the fingers may be configured to match the common indentations of a nut or they may be round or another shape configured to handle any particular type of securing device, such as a square nut, cap-nut or an elliptical fastener. Additionally, the fingers may have various cross-sectional shapes such as elliptical, round, or trapezoidal.
The end piece, which has been described and shown to receive a socket driver may also be configured to receive various other tools such as a screwdriver or other device configured to provide rotational force. The components described in the aforementioned invention would preferably be made of hardened steel, but may also be made of other suitable materials depending on the application and the particular needs; for example, for use in wet environments, the device may be made of aluminum or galvanized steel or have a corrosion resistant finish. Further, the spring used in the various embodiments may be of varying lengths and resilience, and may be used in any one of the embodiments.
It is noted that a grasping tool in accordance with the present invention is capable of grasping nuts and other fasteners over a continuous, but limited, range of sizes. Thus, a single grasping tool in accordance with the present invention may serve as universal socket for a range of fastener sizes. A few grasping tools in accordance with the present invention, each covering a different range of fastener sizes, may thus be used to replace two entire sets (one standard and one metric) of conventional socket wrench sockets.
It is understood that the invention is not confined to the particular construction and arrangement of parts herein illustrated and described, but embraces such modified forms thereof as come within the scope of the following claims.
This application claims the benefit of U.S. Provisional Application No. 60/909,506, filed Apr. 2, 2007, which is incorporated herein by reference in its entirety.
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Number | Date | Country | |
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60909506 | Apr 2007 | US |