Patent Application
20140083260
The present subject matter relates to wrenches used for tightening threaded members on a wide array of mechanical components, piping, and conduit such as for example when engaging components and/or providing a sealed connection.
Stillson wrenches (commonly known as “pipe wrenches”) or other such wrenches utilize a heel jaw secured to a handle and a movable hook jaw which also pivots to a limited extent about a point on the handle. Typically, the hook jaw can be selectively positioned relative to the heel jaw by rotating a threaded member on the wrench. The pivoting action of the hook jaw causes the hook jaw and heel jaw to further close as a rotational force is applied to the handle. Thus, gripping force and torque are simultaneously applied to a work piece.
Pipe wrenches typically used in the field utilize a threaded hook jaw that can be adjusted with a threaded member or nut to fit the size of the work piece. Nonetheless, the placement of the wrench on the work piece may be cumbersome due to the weight of the wrench or variations in the size of the work piece. Thus, it is common for an operator to rest the wrench on a shank portion of the hook jaw before force is applied to the handle. This practice still occurs even though it is known to be an improper use of a wrench as described in a publication, “Proper Use of Pipe Wrenches” by the Ridge Tool Company.
Accordingly, a need exists for a pipe wrench which is not susceptible to such problems with improper use and which provides an increased gripping force on a work piece positioned between its jaws upon application of torque to the wrench.
The difficulties and drawbacks associated with previously known technology are addressed in the present products and methods as follows.
In one aspect, the present subject matter provides a wrench comprising a handle with a stationary lower jaw portion, and a movable upper jaw having a depending shank. The shank includes a threaded region. The wrench also comprises a sleeve rigidly connected to the handle. The sleeve defines a channel sized to moveably receive at least a portion of the shank of the upper jaw. The wrench also comprises a rotatable member threadedly engaged with the threaded region of the shank of the upper jaw. The member is rotatably secured to at least one of the handle and the sleeve. Upon rotation of the member the distance between the lower jaw and the upper jaw is selectively adjusted. The wrench also comprises a deformable member disposed along at least a portion of a face of the shank of the upper jaw, to thereby preclude contact between the shank and a work piece disposed between the lower jaw and the upper jaw.
In another aspect, the present subject matter provides an adjustable wrench comprising a handle having a lower jaw portion and defining a channel extending through the handle. The wrench also comprises an upper jaw having a transversely extending threaded shank. The shank is movably disposed within the channel. The lower jaw, an inner face of the shank, and the upper jaw collectively define a work piece engaging region. The wrench also comprises a rotatable member threadedly engaged with the threaded shank of the upper jaw and movably retained with the handle. Upon rotation of the member the distance between the lower jaw and the upper jaw is selectively adjusted. And, the wrench also comprises a region of nonmetallic deformable material disposed along the inner face of the shank.
In yet another aspect, the present subject matter provides a wrench comprising a handle with a stationary lower jaw portion. The wrench also comprises a movable upper jaw having a depending shank. The shank includes a threaded region. The wrench also comprises a sleeve rigidly connected to the handle. The sleeve defines a channel sized to moveably receive at least a portion of the shank of the upper jaw. The wrench also comprises a rotatable member threadedly engaged with the threaded region of the shank of the upper jaw. The member is rotatably secured to at least one of the handle and the sleeve. Upon rotation of the member the distance between the lower jaw and the upper jaw is selectively adjusted. The wrench also comprises a spacer member disposed along at least a portion of a face of the shank of the upper jaw and extending from at least one of the handle and the sleeve, to thereby preclude contact between the shank and a work piece disposed between the lower jaw and the upper jaw.
In still another aspect, the present subject matter provides a method of providing an increased gripping force on a work piece positioned between the jaws of a wrench upon application of torque to the wrench. The wrench includes (i) a handle with a stationary lower jaw portion, (ii) a movable upper jaw having a depending shank, the shank including a threaded region, (iii) a sleeve rigidly connected to the handle, the sleeve defining a channel sized to moveably receive at least a portion of the shank of the upper jaw, and (iv) a rotatable member threadedly engaged with the threaded region of the shank of the upper jaw, the member rotatably secured to at least one of the handle and the sleeve. Upon rotation of the member the distance between the lower jaw and the upper jaw is selectively adjusted. The method comprises attaching a spacer member to the wrench to preclude contact between the shank and a work piece disposed between the lower jaw and the upper jaw.
As will be realized, the subject matter described herein is capable of other and different embodiments and its several details are capable of modifications in various respects, all without departing from the claimed subject matter. Accordingly, the drawings and description are to be regarded as illustrative and not restrictive.
The present subject matter provides a Stillson wrench or pipe wrench having a spacer, bumper, or other member positioned between a shank portion of a hook jaw and a work piece when disposed between the jaws of the wrench. Depending upon the particular configuration, the spacer or member may be formed from a deformable material or a rigid material as described in greater detail herein. The spacer can be disposed either on the hook jaw, handle, or other component depending upon the type of wrench and/or application. With the addition and use of the spacer, the pivoting action of the hook is uninterrupted even if the wrench is rested on the spacer during initial engagement with a work piece. Thus, the problems associated with the previously noted improper field practice, i.e. lack of gripping force and increased mechanical stress, are avoided.
After provision of a pipe wrench having the noted spacer, or after installation of the spacer on a pipe wrench, the spacer is rested on or otherwise contacted with the work piece thereby preventing direct contact between the work piece and the shank of the hook jaw. For embodiments of the present subject matter utilizing spacers formed from deformable materials, as force is applied to the handle, the deformable material of the spacer is compressed between the work piece and the shank of the hook jaw. Thus, the hook jaw pivots towards the heel jaw to produce significantly increased gripping force. Because the modulus of elasticity of the deformable material is much less than that of the material of the hook jaw, a small amount of force is transferred to the shank of the hook jaw as compared to the case in which the shank of the hook contacts the work piece directly. This same material property allows the deformable spacer to withstand large amounts of strain without damage.
The spacer or bumper is positioned on the wrench such that direct contact between the shank portion of the hook jaw and a work piece positioned between the jaws of the wrench, does not occur. The spacer or bumper can be affixed to one or more components of a wrench, or formed or manufactured with such component(s), during manufacturing. Typically, the spacer or bumper is retained along at least a portion of the shank of the hook jaw. Alternatively, the spacer or bumper is secured to a region of the handle or to another component. In this alternate configuration, the spacer or bumper extends to a location relative to the hook jaw such that the spacer prevents contact between a work piece and the previously noted shank region of the hook jaw.
The spacer or bumper can be formed from a ductile or deformable material. Generally, a wide array of materials can be used for the spacer so long as they exhibit a modulus of elasticity or Young's modulus, which is less than that of the material typically forming the hook jaw, e.g. steel or aluminum and the materials can withstand the mechanical strain present in the application without deforming plastically or permanently. For example, in one configuration of a RIDGID model 36 straight wrench produced by the Ridge Tool Company, a relative displacement of 0.032 inches is observed between the shank of the hook and work piece. Thus, a nitrile rubber with a modulus of 0.025-2 MPa is preferred for this particular configuration in order to minimize the stress of the component. In comparison, many steels exhibit a Young's modulus of approximately 200 GPa and many grades of aluminum exhibit a Young's modulus of approximately 70 GPa. Materials can be selected for other configurations using the same approach; however, a Young's Modulus of 5 GPA or less is generally preferred for the deformable version of the spacer. Nonlimiting examples of preferred materials for use in the spacer or bumper of the present subject matter include certain polymeric materials such as nylon; polystyrene; polyesters such as polyethylene terephthalate (PET); polypropylene; polyethylenes including high density (HDPE), medium density, and low density (LDPE); TEFLON materials such as poly(tetra fluoroethylene)(PTFE); rubber; and combinations thereof. For many applications, rubber is preferred. Generally, it is also preferred that the material selected for the spacer or bumper is also elastomeric. The material(s) selected for the spacer or bumper can be foamed and/or include various additives, fillers, and/or other agents. Typically, the deformable material used for the spacer is a non-metal material.
Table 1 set forth below lists several materials which can be used for the deformable spacer or guide. Table 1 also lists various other materials and serves as a guide for the selection of material(s) suitable for the spacer or bumper in accordance with the present subject matter.
The wrench 110 also comprises a deformable spacer 180 disposed along the interior face 167. Upon positioning a work piece 105 between the jaw members 130, 170, and positioning the work piece 105 toward the shank portion 166, the work piece 105 contacts the deformable spacer 180 instead of the interior face 167 of the shank portion 166. Specifically, the work piece 105 contacts an outer face 182 of the deformable member 180. The deformable member 180 is secured or otherwise attached to the upper jaw 160 and/or the sleeve portion 140 (or other component of the lower jaw 130 or handle 120). The deformable member 180 can be secured or attached by temporary or permanent means. In this particular version, the deformable member 180 is affixed to the interior face 167 of the shank portion 166 of the movable upper jaw 160.
The present subject matter also provides methods of providing an increased gripping force on a work piece when positioned between the jaws of a wrench such as a pipe wrench upon application of torque to the wrench. The method comprises attaching a member to the wrench to thereby preclude contact between the shank of the hook jaw and a work piece disposed between the lower jaw and the upper jaw of the wrench. The member can be formed from a deformable material or from a rigid material. As previously described herein, for embodiments in which the member is attached directly to the shank region of an upper jaw such as in
Additional details of components, assembly, and other aspects of pipe wrenches are provided in U.S. Pat. No. 95,744 to Stillson; U.S. Pat. No. 3,320,836 to Hagerman; U.S. Pat. No. 4,144,779 to Honick; U.S. Pat. No. 4,356,743 to Muschalek Jr.; U.S. Pat. No. 7,040,199 to Gregory; and U.S. Pat. No. D657,213 to Pond et al.
The present subject matter can be implemented in a wide range of wrenches and similar tools such as straight pipe wrenches (for example RIDGID® Straight Pipe Wrench model numbers 6 to 60 and aluminum model numbers 810 to 848 available from Ridge Tool), end pipe wrenches (for example RIDGID® End Pipe Wrench model numbers E-6 to E-36 and aluminum model numbers E-910 to E-924), multi-use pipe wrenches (for example RIDGID® Raprench model number 10), offset pipe wrenches (for example RIDGID® Heavy-Duty Offset Pipe Wrench model numbers 14 to 24 and aluminum model numbers 14 to 24), and compound leverage wrenches (for example RIDGID® Compound Leverage Wrenches model numbers S-2 to S-8A).
The present subject matter includes wrenches and similar tools provided with one or more deformable methods as described herein. The present subject matter also includes the deformable members by themselves or provided in a kit form for incorporation on used or previously purchased wrenches or similar tools. The deformable or rigid members can be provided in a wide array of forms, configurations, colors, and so forth and are in no way limited to the particular versions described herein.
Many other benefits will no doubt become apparent from future application and development of this technology.
All patents, applications, and articles noted herein are hereby incorporated by reference in their entirety.
As described hereinabove, the present subject matter overcomes many problems associated with previous strategies, systems and/or devices. However, it will be appreciated that various changes in the details, materials and arrangements of components, which have been herein described and illustrated in order to explain the nature of the present subject matter, may be made by those skilled in the art without departing from the principle and scope of the claimed subject matter, as expressed in the appended claims.
