1. Field of the Invention
The present invention relates to lacrosse and, more particularly, to an improved connection between the handle and head of a lacrosse stick.
2. Description of the Background
In 1970, the introduction of double-wall, synthetic lacrosse heads revolutionized the game of lacrosse. In comparison to the traditional wooden single-wall heads, the synthetic heads imparted a lightness, maneuverability, and flexibility never-before experienced by lacrosse players. These performance advantages greatly enhanced players' skills such as throwing, catching, cradling, and scooping, and brought the sport of lacrosse to new levels of speed and excitement.
The typical features of a lacrosse stick are shown generally in Tucker et al., U.S. Pat. No. 3,507,495, Crawford et al., U.S. Pat. No. 4,034,984, and Tucker et al., U.S. Pat. No. 5,566,947, which are all incorporated by reference herein.
The traditional double-wall synthetic head is an injection-molded, monolithic structure. Examples of suitable synthetic materials well known in the art include nylon, polypropylene (PP), polyethylene (PE), amorphous polar plastics (e.g., polycarbonate (PC)), polymethylmethacrylate (PMMA), polystyrene (PS), high impact polystyrene (HIPS), polyphenylene oxide (PPO), glycol modified polyethylene terphthalate (PETG), acrylonitrile butadiene styrene (ABS), semicrystalline polar plastics (e.g., polyester PET and PBT), polyamide (e.g., Nylon 6 and Nylon 66), urethane, polyketone, polybutylene terephalate, acetals (e.g., Delrin™ by DuPont), acrylic, acrylic-styrene-acrylonitrile (ASA), metallocene ethylene-propylene-diene terpolymer (EPDM) (e.g., Nordel™ by DuPont), and composites. When first introduced, these materials were clearly superior to wood, offering players improved handling and durability. For example, a lacrosse head constructed of DuPont™ ZYTEL ST 801 nylon resin is able to withstand the bending and harsh impacts inherent to competition far better than a traditional wooden stick. As another example, polycarbonate, though having a flexibility similar to wood, is more structurally durable than wood and much lighter and, therefore, easier to handle.
Ever since the plastic head was incorporated on competition lacrosse sticks in the 1970s the plastic head has been attached to the handle with a simple screw connection, e.g., a “self-tapping” screw through the plastic head and handle (self-tapping screws cut their own threads).
The durability of that connection has long been an issue for several reasons. Repeatedly removing and re-assembling the components will eventually strip the hole and prevent stable assembly. In addition, the stresses on competition lacrosse sticks during play weakens the conventional connection inevitably to the point where the head sometimes loosens or even dislodges from the handle during play. Loosening/dislodgement can occur as the screw unscrews as a result of vibration, or as a result of the threads of the screw stripping as a result of torque or other stress, as no other forces are brought to bear to prevent these occurrences. The problem is growing acute due to the increasing use of lighter and thinner handles. The thread engagement is often limited to two or fewer threads, which cause extreme stress and instability of the head/handle connection which causes stripping and loosening of the head/handle. For example, when the handle encounters an impact, the walls can compress or expand and, without other internal securing mechanisms, easily strip the screw threads. Modern players often resort to taping over the head/handle connection when they feel the connection loosening from play. Moreover, like all athletes lacrosse players are growing bigger and stronger, pressures on the screw connection are increasing, and what is needed is a more robust interconnection for the handle and head of a lacrosse stick to avoid loosening/dislodgement.
References in this application to “competitive play”, “competitive sticks” and the like refer to lacrosse games and sticks that are subject to a governing body set of rules and regulations, such as the NCAA for men's lacrosse, US Lacrosse for women's lacrosse, the National Federation of State High School Association for much of high school lacrosse and variations adopted by individual private school and recreational leagues. Such terms do not refer to articles that have some or all of the basic components of lacrosse sticks (e.g. STX “Fiddle STX”) but which due to their overall size, durability, etc. are not intended for use in competitive play.
It is, therefore, an object of the invention to provide a robust connection mechanism for the handle and head of a lacrosse stick that employs an integral threading mechanism capable of expansion to provide a stronger interconnection, avoid loosening/dislodgement, and which can accommodate various inner handle dimensions.
In accordance with the foregoing objects, the present invention is the combination of an elongate tubular lacrosse handle, a plastic head and an improved connection assembly between the handle and head. In a preferred embodiment, the connection mechanism comprises a collar insert compression-fitted inside the handle. The insert has a compressible body portion which, in an uncompressed form conforms to the interior walls of the handle and is defined by front, back and lateral sides. The insert is anchored inside the handle by detent flanges protruding on the opposing lateral sides of the insert. In addition, the insert has at least one screw threaded through the body portion from top-to-bottom, the screw engaging said body portion so as to compress it inside said handle.
In another embodiment, the connection assembly comprises a unitary one-piece straddle post inserted into the hollow interior of the handle. The straddle post comprises a generally-cylindrically shaped body with internally-threaded through-bore, and a head at both ends of the body, the heads being laterally enlarged with respect to the body and intended for abutment against the interior walls of the handle. This alternative embodiment also comprises a machine screw threaded through at least a first wall of the lacrosse handle and through the straddle post. The machine screw can optionally be threaded through a second opposing wall of the lacrosse handle. The threaded engagement of the screw through the wall(s) and straddle post sandwich the latter, maintaining a constant compressive force against the laterally enlarged heads and against the interior walls of the handle. This avoids loosening and/or dislodgement as a result of impact or vibration, and resists the threads of the screw from stripping either the wall(s) or the insert as a result of torque or other stress.
In yet another embodiment the interconnection comprises a two-piece nut and bolt system where the nut piece comprises a generally cylindrically-shaped body with internally threaded through bore, and a non-cylindrical head at its external end, the head being laterally enlarged and non-cylindrical to prevent the nut piece from spinning when engaged. The nut piece is inserted through a first wall of the plastic head and a first wall of a lacrosse handle. The alternative embodiment also comprises a shoulder bolt piece comprising a generally cylindrical body with external threads along its distal end and a head at the opposing end, the head being laterally enlarged with respect to the body and intended for abutment against the exterior wall of the lacrosse head. The shoulder bolt piece is inserted through a second opposing wall of the plastic head and the second opposing wall of the lacrosse handle (which is inserted into the head). The threaded engagement of the shoulder bolt piece and the nut piece maintains a constant compression force against the external walls of the plastic head and, in turn, the external walls of the handle. The shoulder bolt piece is also sized to create a friction fit between the interior wall of the head and the exterior wall of the handle, providing lateral support to the interconnection and thereby better securing the head.
All embodiments avoid loosening and/or dislodgement as a result of impact or vibration, and resist the threads of the conventional screw stripping either the walls or the insert as a result of torque or other stress. Further, the forces brought to bear by the compression of the plastic head on the handle is in addition to the secure fit of the head and handle caused by the above-described attachment mechanisms serve to prevent unwanted movement and provides a more secure engagement.
Other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments and certain modifications thereof when taken together with the accompanying drawings in which:
Reference will now be made in detail to preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
The present invention is the combination of an elongate tubular lacrosse handle, a plastic head having a frame with a socket for insertion of the handle, and an improved connection assembly between the handle and head. In one embodiment the connection assembly comprises a collar insert fitted into the hollow end of the handle. At least one and preferably two screws are threaded sidelong through the wall of the handle and into threaded apertures in the collar insert. This sandwiches the handle wall to collar insert. Moreover, the collar insert deforms inside the handle and the deformation forms a compression fit which avoids loosening and/or dislodgement as a result of impact or vibration, and further resists the threads of the screw stripping either the walls or the insert as a result of torque or other stress. Alternate embodiments including a one-piece straddle post and a two-piece straddle post are also shown and described.
Referring back to
The machine screw 22 is a conventional machine screw of a length calculated to extend through the desired length of the insert nut 24. If a single machine screw 22 is used its length may exactly equal the diameter of the socket at the end of handle 10. Said length may be halved where two machine screws 22 are threaded into opposing sides of the inset nut 24.
The insert nut 24 comprises a generally cylindrical-shaped body with internally-threaded through-bore, and a head 26 at both ends of the body. The heads 26 may assume any of a variety of configurations all being laterally enlarged with respect to the body, and thereby adapted for abutment against the interior walls of the handle 10. In the illustrated embodiment, the heads 26 each comprise a pair of opposing legs 27 extending co-axially from the body, and a pair of feet 28 each extending diagonally from a corresponding leg 27.
Initially, the lacrosse handle 10 should be inserted inside the socket of the head.
As shown at (A), the nut insert 24 is placed inside the handle 10 with its through-bore in axial alignment with both mounting holes (as conventionally provided on commercial lacrosse stick handles). At (B), the user inserts the machine screw 22 through one wall of the socket of the head, and begins to thread it through the underlying wall of the handle 10 and through the insert nut 24 using an appropriate implement such as an Allen wrench may be used to tighten the machine screw 22. At (C), tightening continues through the opposing wall of the handle, and through the other wall of the socket of the head 10, optionally applying a hex nut as an anchor. This secures the head to the handle 10. The threaded engagement of the screw 22 through the walls and insert nut 24 sandwich the latter, maintaining a constant compressive force against the laterally enlarged heads 26 and against the interior walls of the handle 10. This avoids loosening and/or dislodgement as a result of impact or vibration, and resists the threads of the screw stripping either the walls or the insert as a result of torque or other stress.
The distal end of one body section 38 comprises an externally-threaded male fitting 40 for insertion into a corresponding internally-threaded receptacle in the distal end of the other body section 36.
When the opposing halves of the two-piece insert nut 34 are screwed together and tightened, the compressive force likewise solves both stripping and loosening problems.
It should now be apparent that the above-described invention provides a more robust interconnection for the handle and head of a lacrosse stick because the threaded engagement of the screw 10 through the walls and insert nut 24 (or like engagement of the two-piece insert nut) 34 sandwich the walls, maintaining a constant compressive force against the laterally enlarged heads and against the interior walls of the handle. This avoids loosening and/or dislodgement as a result of impact or vibration, and resists the threads of the screw stripping either the walls or the insert as a result of torque or other stress.
Those skilled in the art will understand that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It is to be understood, therefore, that the invention may be practiced otherwise than as specifically set forth in the appended claims.
The present application derives priority from U.S. provisional application serial no. 61/512,639 filed 28 Jul. 2011.
Number | Date | Country | |
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61512639 | Jul 2011 | US |