Patent Application
20190217451
The claimed tool assembly and system tool for disassembling used threaded components. Any corroded or rusted assemblies using a threaded fastener that is resistant to removal or disassembly can be successfully resolved. The claimed tool assembly and system articles can be used to loosen a rusted or corroded torque resistant threaded fastener and nut. One focus is a combination of a bolt and a complementary threaded member such as a nut.
A common problem in mechanical work is a fastener assembly that cannot easily be removed. Rapid disassembly and assembly of components during maintenance or repair is important in both commercial and do it yourself work. Do-it-yourself mechanics use hand powered wrenches of various designs. These impose continuous torque on a fastener but typical cannot place much more than 200 ft.- lbs. torque. Commercial mechanical shops use impact wrenches for quick disassembly. Impact wrenches impose intermittent torque on a fastener and, depending on manufacturer, typically provide about 230-800 ft.-lbs. torque.
In the repair or maintenance of many mechanical assemblies, a worker can encounter a “frozen” bolt in combination with a complementary threaded member such as an assembly held with a nut and bolt. A “frozen” fastener (e.g., a corroded or rusted nut or bolt) is one such that the environment of use of the nut and bolt has caused significant corrosion, rusting or other chemical change in the surface of the fasteners, such that the bolt assembly resists the application of even substantial amounts of torque for initiating rotation with respect to the complementary threaded member and subsequent removal, disassembly or reassembly without damage. Often, for economic considerations, the re-use of the nut and bolt is important since either the nut or bolt cannot be obtained on the marketplace or is cost prohibitive. During maintenance or repair, the amount of torque required for rotation of a nut with respect to the bolt or threads can be such that the torque applied by the common tools such as an ordinary wrench or ratchet socket and handle is insufficient to rotate the bolt with respect to the complementary threaded member. Such a torque can easily exceed 800 ft.-lbs. torque and can result in the mechanical failure of the fastener.
Considering this problem, a substantial need exists for a tool as a part of a system for frozen nut removal that can significantly increase the amount of continuous torque that can be applied to a nut frozen on a thread, such that the nut can be removed without damage to the nut thread or the nut and bolt assembly. Torque levels in the range of 400-1500 ft.-lbs. torque may be required.
BRIEF DESCRIPTION
A tool and system for loosening a torque resistant fastener assembly is disclosed. The basic elements are a receiver that is fixedly mounted. Torque levels in the range of 400-1500 ft.-lbs. torque can be achieved. I have found an insert member that can be inserted into a correspondingly shaped receiver that can be used in removal of a complementary threaded member from a threaded bolt. The insert member has a body shaped for insertion into common receiver profiles. The complementary shape of the insert with the receiver interior holds that insert stable when torqued. The insert body further comprises a first socket drive and a second socket drive. These socket drives can be and are preferred to be sized for different drive sockets or tools. The insert body can have an aperture that can receive a pin that cooperates and fixes the insert within a corresponding aperture and receiver. The insert body is fixed in place in the receiver during use.
In use, the insert body is fixed and mounted into a receiver by inserting the insert body profile into a corresponding receiver opening. The insert body is fixed in place using a mounting pin.
Onto the drive of insert body is placed a socket drive. Into the socket is placed the frozen bolt assembly. The threaded body can be mounted into the socket separately or in conjunction with any object in which it can be mounted or otherwise assembled. Onto the frozen bolt assembly is placed a second socket. The first socket and second socket are assembled with the nut and bolt, such that one socket drives the nut and the second socket drives the bolt head or threaded body.
Onto the second socket is placed a cooperating tool with a lever arm such as a ratchet handle, which can have an arbitrarily long lever arm. The lever arm distance is selected such that the lever arm can apply an arbitrarily large amount of torque onto the threaded body, bolt head or nut or both, such that the resistance caused by the frozen nut, threaded body and bolt can be overcome by the torque initiating relative rotation of the bolt with respect to the nut and its subsequent removal.
In one embodiment is shown an insert body having a first drive and a second drive.
In another embodiment is shown a receiver having an insert body shaped opening.
In another embodiment is shown an assembly of the receiver, the insert body, two drive sockets, the frozen nut thread and bolt and an appropriately sized torque handle.
A “fastener assembly” in this disclosure includes a cylindrical threaded fastener rotatably inserted into the circular portion of a threaded receiver. An example of a fastener assembly is a bolt and nut. The terms frozen, corroded and rusted are roughly synonymous and refer to a fastener assembly that resists disassembly or removal.
The above summary of the present disclosure is not intended to describe each disclosed embodiment or every implementation of the present disclosure. The description that follows more particularly exemplifies illustrative embodiments. In several places throughout the application, guidance is provided through lists of examples, which examples can be used in various combinations. In each instance, the recited list serves only as a representative group and should not be interpreted as an exclusive list.
The disclosure is illustrated by the following figures. These figures, materials, amounts, and procedures are to be interpreted broadly in accordance with the scope and spirit of the disclosure as set forth herein. The disclosure may be more completely understood in consideration of the following detailed description of various embodiments of the disclosure relating to the accompanying drawings, in which:
The figures are not necessarily to scale. Like numbers used in the figures refer to like components. However, it will be understood that the use of a number to refer to a component in a given figure is not intended to limit the component in another figure labeled with the same number.
In a general sense, the present disclosure relates to a tool and system for loosening a torque resistant fastener assembly.
Oxidation and corrosion of fastening devices is a common and recurring problem. For example, fasteners, such as nuts and bolts are installed, and after years of use, when they need to be removed and/or replaced, such removal is prevented by the nut being “frozen” onto the bolt. To apply sufficient torque to loosen the bolt, the nut must be held steady. When a worker does not have a helper to hold the nut from rotating, he is unable to apply sufficient torque to loosen it. Even if a coworker is available, he may not be strong enough to hold the workpiece steady. Thus, a need exists to develop a mechanism by which the workpiece can be prevented from rotating. Optimally, the device should be simple to manufacture, easy to use, and compatible with other tools usually found in a well-equipped mechanic's armamentarium.
The high torque holding device fits such a need. It can be made from readily available and relatively inexpensive hot rolled steel or other high tensile suitable material, and it is designed to be used with standard wrenches that are commonly included in socket sets that are found in virtually all automotive facilities as well as in most of home workshops. Perhaps the biggest advantage of this device is that it relies, for its stability, upon an attachment that is found on most cars and trucks: a trailer hitch. By designing the high torque holding device to fit into a standard trailer hitch receiver, the device can be utilized by anyone whose car or truck has a trailer hitch.
The principle of the device is straightforward. The device fits securely into the trailer hitch, and a half-inch or three-quarter inch square drive extends from the free end. This square drive is then inserted into a socket which matches the size of the nut to be held. The user places another socket, with a long lever arm, on the bolt which is stuck on the nut, and sufficient torque can then be applied to loosen the nut. The presence of the massive vehicle to which the trailer hitch is mounted renders rotation of the nut impossible.
Occasionally the nut and bolt are so tightly stuck to each other that, rather than the nut coming loose, the torque exceeds the bolt's strength and the bolt breaks. This is not necessarily a disadvantage, as frequently the nut and bolt are expendable, and the desired piece can be salvaged and re-used after being released from the nut and bolt. In the claimed tool/assembly, torque is a rotational aspect of a force acting through a lever arm to rotate an object. The rotational action required by the assembly/tool on the frozen fastener to loosen/remove/disassemble the structure is obtained by placing sufficient torque on the handle 66 to cause the socket 65 to force the bolt 63 to rotate with respect to the nut 64. Torque is quantized as newton-meters (Nm) or foot-pounds (ft·lbs). One Nm is equal to 0.7376 ft·lbs. In the case that the fastener will mechanically fail before loosening and removal, the assembly/tool must be able to exert such a torsional force without failure.
The materials used in the assembly/tool as used must have sufficient structural modulus such that the assembly/tool can place sufficient torque on the fastener to accomplish its loosening, removal or disassembly or in other cases the mechanical failure of the fastener. The assembly/tool must not mechanically or structurally fail in the application of torque when in use. The assembly/tool must be made with sufficient size or dimensions in combination with sufficient modulus to act successfully. Typical receivers have either about 51 or 32 mm (2 or 1.25 inches) square internal opening and have a wall thickness of about 4 to 10 mm (0.15 to 0.4 inch). Such structures made from high strength steel have sufficient strength to withstand the torques necessary of successful operation. The inserts can be solid or hollow and can be made of high strength material such as steel. If solid, the inserts are sized to match the receiver openings. If hollow, the insert walls are sized to match or exceed the receiver walls. The sockets and socket drive lever arm are commercial materials and are typically engineered to provide sufficient torsional force to act successfully. The torsional strength of the materials used in the insert and receiver should meet or exceed that of the socket and lever arm. Structural steel such as medium carbon steel, medium carbon alloy steel and super strength alloy steels are sufficient with tensile capacity and shear capacity of 500 to 2000 Mpa (70 to 300 ksi).
The initial prototype of this device was machined from an 8-inch-long piece of 2-inch square hot rolled steel (ASTM A36). Sufficient metal was removed to form a ¾ inch square drive on one end, and a ½ inch square drive on the other. Depending on socket availability and the need for strength, a selection can be made to use either square drive. Most socket wrenches have a spring-loaded ball on the side of the square drive to prevent the socket from slipping off. The prototype did not contain these, but the plans for the final product do include that feature. Cost and weight considerations could result in manufacturing the device using a hollow square steel tube, with 3/32 inch or ¼ inch thick walls, which is a readily available material, rather than a solid 2-inch square bar. This would be cheaper and lighter than the prototype, although the manufacturing process would require that the square drive ends be welded onto the square tube.
The design of the device calls for a ¾ inch square drive at one end, and a ½ inch square drive on the other. Therefore, depending on the preference of the user, a half-inch or three-quarter inch square drive socket can be used. Additionally, the design calls for a ⅝-inch hole to be drilled transversely in the middle of the device, to accommodate the locking pin that is routinely used to secure a trailer hitch into a receiver.
DETAILED DESCRIPTION OF THE FIGURES
The disclosure will be further explained in greater detail by the figures that follow; however, the scope of this disclosure is not construed to be limited by the scope of these exemplary figures. The following is a table of Figure elements and reference numbering.
All scientific and technical terms used herein have meanings commonly used in the art unless otherwise specified. The definitions provided herein are to facilitate understanding of certain terms used frequently herein and are not meant to limit the scope of the disclosure. The words “preferred” and “preferably” refer to embodiments of the disclosure that may afford certain benefits, under certain circumstances. However, other embodiments may also be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the disclosure.
The term “comprises” and variations thereof do not have a limiting meaning where these terms appear in the description and claims.
As used in this specification and the appended claims, the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.
“Include,” “including,” or like terms means encompassing but not limited to, that is, including and not exclusive.
The complete disclosure of all patents, patent applications, and publications cited herein are incorporated by reference. If any inconsistency exists between the disclosure of the application and the disclosure(s) of any document incorporated herein by reference, the disclosure of the application shall govern. The foregoing detailed description and examples have been given for clarity of understanding only. No unnecessary limitations are to be understood therefrom. The disclosure is not limited to the exact details shown and described, for variations obvious to one skilled in the art will be included within the disclosure defined by the claims.
Unless otherwise indicated, all numbers expressing quantities of components, molecular weights, and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about.” Accordingly, unless otherwise indicated to the contrary, the numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. At the very least, and not as an attempt to limit the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed considering the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. All numerical values, however, inherently contain a range necessarily resulting from the standard deviation found in their respective testing measurements.
All headings are for the convenience of the reader and should not be used to limit the meaning of the text that follows the heading, unless so specified.
