Patent Publication Number: US-2007117688-A1

Title: Multipurpose martial arts training device

Description:
TECHNICAL FIELD  
      The present invention relates to training equipment used in martial arts. In particular, a multipurpose device that may be used as a staff, a stretching aid or separated into two clubs.  
     BACKGROUND OF THE INVENTION  
      Training for the martial arts takes on many aspects. In addition to teaching self-defense, it presents a physical fitness regimen to condition the body. Part of the training includes the use of conventional weapons, such as a staff sometimes called a Bo Staff, or a Jo Staff, which is shorter than a Bo, as well as clubs, sometimes called Escrima or Kali Sticks.  
      Typically, the practitioner would train with one weapon at a time. To change weapons in the middle of a session, the student must interrupt or delay the action to make an exchange. At times, the student may be engaged in a battle with two or more opponents with different weapons. In such situations, it may be advantageous to have the use of more than one weapon. For example, a student in combat may wish to switch from a Bo Staff to Kali Sticks, but may be unable to do so with conventional training weapons.  
      Additionally, the physical fitness aspect of the sport generally requires warm-up exercises that include stretching the muscles. For some advanced techniques, stretching is essential. Students practicing such techniques require extreme flexibility in the legs, including stretching to nearly 180 degrees. Stretching aids can be used to assist with the flexibility exercises, but providing and carrying such additional equipment can be burdensome. Presently, there is no simple stretching aid that would serve other purposes. It would be advantageous to combine such equipment with other martial arts equipment to minimize transporting excessive amounts of devices and to reduce storage area requirements.  
      Therefore, there is a need for a device that can easily convert from one weapon to another during training without having to interrupt the training to exchange weapons. In addition, there is a need for a device that may be utilized as a weapon during training as well as a stretching tool prior to weapons training.  
     SUMMARY OF THE INVENTION  
      The present invention provides modular martial arts training devices comprising at least two tubular components, each having at least one joining end, an interior surface and an exterior surface, and a connection means affixed within the interior surfaces of each of the joining ends to removably affix the tubular components together to form a continuous shaft.  
      In one embodiment, the continuous shaft comprises two tubular components, a first tubular component and a second tubular component with the connection means comprising a receiving means affixed within the interior surface of the joining end of the first tubular component and a locking means affixed within the interior surface and projecting from the joining end of the second tubular component. In one embodiment, the receiving means consists of a pin mounted transverse within the interior surface of the first tubular component and setback from the joining end; and the locking means comprises a cylindrical component having an upper end, a lower end and an external diameter, the external diameter able to be received within the joining end of the second tubular component and is affixed within the interior surface of the second tubular component, while the upper end projects from the joining end of the second tubular component and has a hook to engage the pin. In a preferred embodiment, the hook comprises at least one J-shaped notch in the upper end of the cylindrical component for engaging the pin.  
      In another embodiment, the locking means further comprises a spring having a bottom end and a top end fitted within the cylindrical component, with the bottom end affixed within the lower end of the cylindrical component and the top end being about flush with the upper end of the cylindrical component when uncompressed. In a preferred embodiment, the locking means comprises a spring and a shaft within the spring with one end of the shaft affixed to the top end of the spring and the other end slidably affixed to the lower end of the cylindrical component, with the bottom end of the spring affixed to the lower end of the cylindrical component.  
      In yet another embodiment the exterior surface of the first and second tubular components comprise gripping means.  
      Another aspect of the invention provides a method of converting the martial arts training staff into martial arts training clubs comprising the steps of; grasping the training staff about the middle of a first tubular component with one hand and grasping about the middle of a second tubular component with the other hand; compressing the first tubular component toward the second tubular component; twisting the first tubular component in one direction while twisting the second tubular component in the opposite direction disengaging the first tubular component from the second tubular component; and separating the tubular components into martial arts training clubs.  
      Another aspect of the invention provides a martial arts training device as well as a stretching tool for flexing the user&#39;s legs prior to training. The device comprises at least two tubular units having at least one joining end, an interior surface and an exterior surface, with a connection means affixed within the interior surface of joining ends to removably affix the tubular units together to form a continuous shaft, and at least two leg attachment means able to be affixed to the exterior surfaces of the at least two tubular units.  
      In one embodiment of this aspect of the invention, the continuous shaft comprises three tubular units, a first tubular unit having a first end and a second end, a second tubular unit having a third and fourth end and an internal surface and an external surface, and a third tubular unit having a fifth and sixth end. Preferably, the first tubular unit and the third tubular unit further comprise a plurality of apertures positioned linearly along the lengths of the first and third tubular units. The connecting means preferably comprises a threaded dowel extending from the second end of the first tubular unit, a threaded dowel extending from the fifth end of the third tubular unit, and the internal surface of the third and fourth ends of the second tubular unit being threaded and able to receive the threaded dowels extending from the first tubular unit and the third tubular unit. Alternatively, the connection means comprises a threaded dowel extending from the third and forth ends of the second tubular unit, and the internal surface of the second end of the first tubular unit and the fifth end of the third tubular unit being threaded and able to receive the threaded dowels extending from the second tubular unit. Preferably, the threading on the threaded dowel of the first tubular unit is a right-handed thread and the threading on the threaded dowel of the third tubular unit is a left-hand thread, with the threading on both tubular units being the same pitch. Alternatively, the threading on the threaded dowel on the third end of the second tubular unit is a right-handed thread and the threading on the threaded dowel on the forth end of the second tubular unit is a left-handed thread. Preferably, the threading is at about 1 to 3 threads per inch and a pitch of about a 25 to about a 45-degree orientation.  
      In another embodiment, the at least two leg attachment means comprise adjustable straps with a pin affixed to one end, the pins able to be received by any of the plurality of apertures of the first and third tubular units. To prevent the leg attachment means from slipping at the legs of the user, one embodiment consists of a restraining means removably affixed to both adjustable straps and held in place behind the user.  
      In yet another embodiment, the external surface of the second tubular unit comprises a gripping means.  
      In a preferred embodiment, the martial arts training device comprises three tubular units, a first tubular unit having a first end and a second end, a second tubular unit having a third and fourth end, and a third tubular unit having a fifth and sixth end, with the second tubular unit having an internal surface and an external surface, the first tubular unit and the third tubular unit further comprising a plurality of apertures positioned linearly along their lengths; a connection means comprising a right-handed threaded dowel extending from the second end of the first tubular unit, a left-handed threaded dowel extending from the fifth end of the third tubular unit, and the internal surface of the third and fourth ends of the second tubular unit being threaded and able to receive the threaded dowels extending from the first tubular unit and the third tubular unit to removably affix the three tubular units together to form a continuous shaft; and two leg attachment means comprising an adjustable strap and a pin affixed to one end of the adjustable strap for each of the two leg attachment means, the pins being able to be received by the plurality of apertures of each of the first and third tubular units. Alternatively, the connection means may comprise a right-handed threaded dowel extending from the third end of the second tubular unit, a left-handed threaded dowel extending from the forth end of the second tubular unit, and the internal surface of the second end of the first tubular unit and the fifth end of the third tubular being threaded and able to receive the threaded dowels extending from the second tubular unit to removably affix the three tubular units together to form a continuous shaft.  
      In yet another aspect of the invention, a method for assisting flexibility and stretching exercises using the modular martial arts training device comprising the steps of; affixing a first tubular unit to a second tubular unit by inserting a right-handed threaded dowel extending from the second end of the first tubular unit into the third end of the second tubular unit; affixing a third tubular unit to the second tubular unit by inserting a left-handed threaded dowel extending from the fifth end of the third tubular unit into the fourth end of the second tubular unit; connecting one adjustable strap onto the right leg; connecting one adjustable strap onto the left leg; affixing the right leg to the first tubular unit by inserting a pin connected to the adjustable leg strap into one of a plurality of apertures on the first tubular unit; affixing the left leg to the third tubular unit by inserting a pin attached to the adjustable leg strap into one of a plurality of apertures on the third tubular unit; and rotating the second tubular unit, thereby unthreading the first tubular unit and the third tubular unit from the second tubular unit, thereby flexing and stretching the user&#39;s legs. 
    
    
     DESCRIPTION OF THE FIGURES  
       FIG. 1 : Is a diagrammatic representation of the staff/clubs embodiment of the present invention showing (A) the side view; (B) the top view; (C) the bottom view; (D) a side view of an exploded diagrammatic representation with spring compressed; (E) a bottom view of the female club; (F) a top view of the female club; (G) a top view of the male club; and (H) a bottom view of the male club.  
       FIG. 2 : Is a diagrammatic representation of the staff/stretching tool embodiment of the present invention showing (A) the side view; (B) the top view; (C) the bottom view; (D) a side view of an exploded diagrammatic representation; (E) a bottom view of the left tubular unit; (F) a top view of the left tubular unit; (G) a top view of the right tubular unit; (H) a bottom view of the right tubular unit; (I) a top view of the central tubular unit; (J) a bottom view of the central tubular unit; (K) a view of the restraining means; and (L) a view of the leg attachment means. 
    
    
     DETAILED DESCRIPTION  
      Unless defined otherwise, all terms used herein have the same meaning as are commonly understood by one of skill in the art to which this invention belongs. All patents, patent applications and publications referred to throughout the disclosure herein are incorporated by reference in their entirety. In the event that there is a plurality of definitions for a term herein, those in this section prevail.  
      The term “affixed” as used herein refers to a means for securely retaining one component of the device to another element by a variety of means known to one skilled in the art, such as, for example a cylindrical component may be connected to a tubular component by friction fit, welded, brazed, press-pinned, riveted, bolted, or with adhesive.  
      The term “connection means” as used herein refers to a means for to a mechanism for reversibly fastening two elements of the invention together, such as the two tubular components. A variety of connecting mechanisms known in the art may be utilized with the present invention such as for example, a pressure twist connector that provides spring tension to maintain force against a hook and pin connection between two tubular components.  
      The term “locking means” as used herein refers to a mechanism for securely fastening two elements of the invention together, such as the two tubular components, so that they cannot be separated during use without action by the user to disengage the elements. A variety of means known to one skilled in the art may be used to perform this function, such as, for example a pressure twist lock that upon compressing the two joining ends of the tubular components together engages the pin of one tubular component in the slot of the “J” hook on the other tubular component and upon twisting locks the pin in the hook.  
      The term “receiving means” as used herein refers to a passive means for engaging one element of the invention by another element. A variety of means known to one skilled in the art may be utilized such as for example a pin mounted transverse within the interior diameter of a tubular component that is engaged by a hook provided on another tubular component.  
      The term “gripping means” as used herein refers to a means for assisting a user in securely holding onto an element of the invention, such as a tubular component or tubular unit, to prevent slipping. A variety of means known to one skilled in the art may be utilized with the present invention, such as, for example tooling the exterior surface of a tubular component to create a textured surface that would increase the friction between the users hand and the tubular component when gripping the device.  
      The term “attachment means” as used herein refers to a variety of means for affixing an element of the invention to the user, such as for example, a strap secured about the user&#39;s leg and affixed to a tubular unit of the invention by a pin affixed to the strap and used to engage an aperture in the tubular unit.  
      The term “restraining means” as used herein refers to a means for preventing migration of the attachment means along the user&#39;s legs when the device is used for stretching. A variety of means known to one skilled in the art may be utilized for this function, such as, for example, a harness secured to one attachment means about the user&#39;s leg that runs behind the user and attaches to the other leg attachment means.  
      The present invention provides modular martial arts training devices comprising at least two tubular components with a connection means. In one embodiment the device comprises two tubular components and in another embodiment the device comprises three tubular units.  
      Two Component Martial Arts Training Device  
      In one embodiment, the device  10  comprises two tubular components, a first tubular component  12  and a second tubular components  12  and  14 , each having a joining end, an interior surface and an exterior surface, and the connection means affixed within the interior surfaces of each of the joining ends to removably affix the tubular components,  12  and  14  together to form a continuous shaft or staff.  
      The tubular components,  12  and  14 , when separated, constitute training clubs. The first and second tubular component  14   s  may be identical in their dimensions and composition or they may be different. They are generally cylindrical in shape and uniform in their dimensions. For example, if the thickness of the tubular component is. ⅛ inch, this will generally be its thickness throughout its entire length. However, one skilled in the art would recognize that variations in the uniformity of the tubular components,  12  and  14  may be desired and adjust the dimensions accordingly. Such as, for example, an enlarged or pointed aspect on the non joining end of the tubular component to provide for different training methods associated with such aspects; an uneven texturing of the tubular components surface for enhanced gripping or increased damage on impact with an object or opponent; or increasing the weight of one end of the tubular unit to increase force of impact by, for example, anchoring a lead weight on the interior of one end of the tubular component or utilizing solid cylindrical stock material to prepare the tubular component or one end of the tubular component. Preferably at least a portion of the external surface of each tubular component comprises a gripping means  22  such as for example machined serrations, or leather or rubber wraps. Preferably, the gripping means  22  is a machined surface in anodized aluminum material.  
      The thickness of the tubular components,  12  and  14  will depend on the material used to construct the components. If the tubular components,  12  and  14  are made of a material resistant to damage upon impact such as steel, the components may be constructed of tubular stock having a thickness substantially less than material that is easily damaged upon impact such as aluminum. Consequently steel tubing stock material used to construct the tubular components,  12  and  14  could be, for example, 1/16 inch thick while an aluminum tubular component having a similar damage resistance could be ⅛ inch thick.  
      The external diameter of the tubular components  12  and  14 , will vary depending on the user. In general the external diameter should be such that it is easily grasped and manipulated by the user during martial arts training exercises. A user with smaller hands, such as a child, will most likely prefer a smaller diameter tubing for the construction of the training device  10 . Correspondingly a user with larger hands such as an adult may prefer a larger diameter tubing training device  10 . Preferably the diameter of the tubing used to construct the training device  10  is not less than about ½ inch and not greater than about 2½ inches. Most preferably, the diameter is not less than about ¾ inch and not more than about 1½ inches.  
      The length of the shaft may vary depending on the height of the user. For example, if the user is a small person or child a shorter shaft would be preferred, a shaft not less than about 24 inches and not more than about 48 inches may be appropriate. For a person of five feet in height or taller, the user may prefer a longer shaft one not less than about 48 inches to not more than about 72 inches. Preferably the shaft is about 36 inches for a smaller person or child or about 60 inches for a person of five feet in height or taller. The length of the clubs will vary depending on the length of the shaft. If the connection means were positioned about the middle of the shaft the clubs or tubular components would be the same or approximately the same length. Preferably the length of the tubular components,  12  and  14  for a shorter shaft is not less than about 12 inches to not more than about 24 inches and not less than about 24 inches and not more than about 36 inches for a longer shaft. If the connection means is not positioned in the middle of the shaft the clubs or tubular components,  12  and  14  will be of different lengths. One skilled in the art would recognize that a wide variety of differing sized clubs or tubular components could be prepared depending on the length of the shaft and the desires of the user. Most preferably, the length of the continuous shaft is about 48 inches, with each of the tubular components,  12  and  14  having a length of about 24 inches.  
      The tubular components,  12  and  14  may be constructed of a variety of materials that provide strength, durability, impact resistance and are light in weight. Further they may be constructed from tubular or solid stock materials, for the variety of embodiments described herein. When tubing stock is used the end of the tubular components,  12  and  14  may be open or capped. Preferably the tubular components,  12  and  14  are made of wood, plastic polymer, carbon fiber, steel tubing, aluminum tubing or any combination thereof. Preferably, the material is anodized aluminum tubing.  
      A variety of connection means may be utilized with the present invention between the two tubular components,  12  and  14  that provides a durable connection when the device  10  is used as a staff and a quick release method to allow the staff to convert to two clubs when desired.  
      In one embodiment a receiving means is affixed within the interior surface of the joining end of the first tubular component  12  and a locking means is affixed within the interior surface and projecting from the joining end of the second tubular component  14 .  
      In a preferred embodiment, the receiving means consists of a pin  16  mounted transverse and setback from the joining end within the interior surface of the first tubular component  12 . One skilled in the art would recognize that the pin  16  should be constructed of a durable material having the strength to maintain the two tubular components,  12  and  14  together when the device  10  is used as a staff in simulated combat on a repeated or continuous basis. The strength of the pin  16  will vary depending on the diameter, the material used to construct the pin and the length of the pin. If the pin  16  were made of a hardened bend resistant metal its diameter could be narrower than it would have to be if the metal were untreated. Correspondingly, increasing the diameter of the pin  16  will increase its strength. In view of this, one skilled in the art would recognize that the material selected would determine the available diameters having the desired characteristics to construct the pin  16 . The pin  16  may be constructed of a variety of material stocks but is preferably a solid metal stock and most preferably made of hardened steel. If the pin  16  is made of metal its diameter is preferably not less than about 1/16 inch and not more than about 5/16 inch. Most preferably, the pin  16  is not less than about ⅛ inch and not more than about ¼ inch in diameter.  
      The length of the pin  16  may vary depending on the external diameter of the tubular component. Preferably the pin  16  is the same length or just less than the external diameter of the tubular component. For example, if the tubular component has an external diameter of about one inch, the pin  16  would be not more than one inch in length.  
      The pin  16  is set back from the joining end of the first tubular component  12  to engage the locking means projecting from the joining end of the second tubular component  14 . This distance will depend on the length of the locking means protruding from the joining end of the second tubular component  14  and will be provided in a configuration that allows the locking means to securely engage the pin  16 , thereby holding the two tubular components,  12  and  14  securely together. One skilled in the art would recognize that the distance the pin  16  is setback from the joining end would be a function of the design of the locking means of the second tubular component  14 . Preferably this distance is not less than about ¼ inch and not more than 5 inches. Most preferably this distance is not less than about ½ inch and not more than 2 inches. The pin  16  may be affixed in place by a variety of methods, such as for example, the tubular component may be manufactured having two diametrically opposed apertures wherein the pin  16  is press fit in place. Alternatively, these apertures may be provided with threads to allow a threaded pin  16  to be screwed into place.  
      In another configuration the receiving means comprises a single pin  16  projecting inward from one side of the interior surface of the tubular component. Alternatively, the receiving means comprises two pins positioned opposite each other and projecting inward from the interior of the tubular component. In each of these configurations the pin, or pins, have the same characteristics as previously mentioned except for their length. Since the pins do not traverse the interior surface of the tubular components  12  and  14  they may be significantly shorter in length ranging from about ¼ to about ¾ the external diameter of the tubular component. For example if the external diameter of the tubular component is 1 inch having a thickness of about ⅛ inch then a single pin could range in length from not less than about ¼ inch and not more than about ¾ inch. If two pins were used their length could range from not less than about ¼ inch to not more than about ⅜ inch.  
      In one embodiment, the locking means is affixed within the interior surface of, and projecting from, the joining end of the second tubular component  14 . In a preferred embodiment the locking means comprises a cylindrical component  18  having an upper end, a lower, end and an external diameter. Its external diameter is preferably slightly less than the internal diameter of the tubular components,  12  and  14  to allow the lower end of the cylindrical component  18  to be easily inserted and affixed. A variety of methods known to those skilled in the art may be used to affix the cylindrical component  18  within the second tubular component  14 , such as for example, brazing, welding, adhesive, friction fit, rivet or press pin. Alternatively, the cylindrical tubing may be press fit into the joining end of the second tubular component  14 . In this configuration the diameter of the cylindrical component  18  is slightly larger than the interior diameter of the tubular component. A preferred method is to use both a press fit and a press pin for anchoring the cylindrical component  18  in the joining end of the second tubular component  14 .  
      The upper end of the cylindrical component  18  projects from the joining end of the second tubular component  14  and is able to be inserted into the internal diameter of the first tubular component  12 . The upper end of the cylindrical component  18  comprises a hook to engage the pin  16  mounted in the joining end of the first tubular unit  12 . In a preferred embodiment, the hook comprises at least two J-shaped notches  20  in the upper end of the cylindrical component  18  opposite each other for engaging the pin  16 . In this configuration the upper portion of the J-shaped notches  20  receive the pin  16 . Upon further compression the pin  16  moves down to the lower portion of the J-shaped notches  20 . When the pin  16  reaches the base of the J-shaped notches  20  the two tubular components,  12  and  14  are twisted in opposite directions moving the pin  16  into the curved portion of the J-shaped notches  20 , thereby locking the two tubular components,  12  and  14  together.  
      The width of the J-shaped notch  20  is preferably a dimension able to receive the diameter of the pin  16 . For example, if the pin  16  diameter is ¼ inch then the width of the notch would be not less than about ¼ inch and not more than about ⅜ inch.  
      The shape of the J-shaped notch  20  may vary from the shape of the letter J to the shape of the letter L at the desire of the user to allow for a quick release with or without a locking connection. Preferably the L-shape provides a secure pressure connection while the J-shape provides a secure locking connection.  
      The length of the cylindrical component  18  will vary depending on the length of the shaft. In particular, one skilled in the art would recognize that increasing the length of the cylindrical component  18  that will be inserted into the first tubular component  12  would increase the strength and stability of the connection joining the two tubular components,  12  and  14 . Preferably the length of the cylindrical component  18  would increase with increasing length of the shaft to impart more strength and stability to the connection between the two tubular components,  12  and  14 . For example, if the shaft was about 48 inches to about 60 inches the length of the cylindrical component  18  could be from not less than about 4 inches to not more than about 12 inches. If the shaft was about 24 inches to about 36 inches the length of the cylindrical component  18  could be from not less than about 1 inch to not more than about 8 inches. Preferably about ½ of the length of the cylindrical component  18  is secured within the joining end of the second tubular component  14  to provide the strength necessary for use as a staff.  
      The thickness of the cylindrical component  18  will vary depending on the structural integrity one skilled in the art would desire for the connection between the two tubular components,  12  and  14  and the method of pressure application utilized to affix the cylindrical component  18  into the tubular component. If the cylindrical component  18  is constructed of tubular stock, the thickness is preferably about the same thickness as the thickness of the tubular components,  12  and  14 . The outer diameter of the cylindrical component  18  will depend on the internal diameter of the tubular components,  12  and  14 . Preferably, the outer diameter of the portion of the cylindrical component  18  that is affixed within the tubular component is slightly smaller than the interior diameter of the second tubular component  14 . Preferably, the outer diameter of the upper end of the cylindrical component  18  will be slightly smaller than the mating internal diameter on the first tubular component  12  for ease of assembly and disassembly. Preferably, the internal diameter of the cylindrical component  18  results in a wall thickness of that portion of the cylindrical component  18  approximately equal to the thickness of the tubular components. The inner diameter will extend some length of the cylindrical component  18 , to provide a cavity for the pressure application component. Preferably, the inner diameter will extend about three quarters the length of the cylindrical component  18 . A secondary inner diameter may extend the balance of the length of the locking means if a shaft is used in conjunction with the pressure device, or if a lighter staff is desired.  
      The cylindrical component  18  may be constructed of a variety of materials such as for example metal, polymer, plastic or carbon fiber. Preferably the cylindrical component  18  is constructed of the same material as the tubular components,  12  and  14 . Most preferably the cylindrical component  18  is made of aluminum with an anodized finish.  
      The length of the J-shaped notch  20  will depend on the length that the cylindrical component  18  projects from the joining end of the second tubular component  14  and the setback distance of the pin  16  in the joining end of the first tubular component  12 . Preferably the length of the notch is such that when engaging the pin  16  and locking it in place the two tubular components,  12  and  14  are held together firmly. In a preferred embodiment a mechanical means is provided that allows for compression of the two tubular components,  12  and  14  to move the pin  16  through the full length of the J-shaped notch  20  and a continuing pressure as the pin  16  comes to rest in the end of the J-shaped notch  20  locking the two tubular components,  12  and  14  together. This mechanical means can be provided by a variety of methods known to those skilled in the art including for example a rubber compression ring, a compressible O-ring or a spring.  
      In one embodiment, the locking means includes a spring  24  to assist in holding the pin  16  securely in the J-shaped notch  20 . In one configuration the spring  24  has a bottom end affixed within the lower end of the cylindrical component  18  having the largest external diameter for affixing within the tubular component and a top end being about flush with the upper end of the cylindrical component  18  when uncompressed. The spring  24  compresses when the J-shaped notch  20  of the cylindrical component  18  of the second tubular component  14  engages the pin  16  of the first tubular component  12  as the cylindrical component  18  is inserted into the joining end of the first tubular component  12 . Once the pin  16  reaches the base of the J-shaped notch  20  the two tubular components,  12  and  14  are twisted in opposite directions to hook the pin  16 , and then allowed to separate until the pin  16  engages the upper looped portion of the J-shaped notch  20 . The pressure provided by the spring  24  serves to hold the pin  16  within the notch, thus securing the two tubular components,  12  and  14  into a single staff. In another configuration, the locking means comprises a shaft within the spring  24  with one end of the shaft slidably affixed to the top end of the spring  24 , and the other end slidably affixed to the lower end of the cylindrical component  18 . The shaft may be secured to the cylindrical component  18  by threaded nut, retaining pin or other similar method. One skilled in the art would recognize that the size and compressive strength of the spring  24  would be a function of the compressive force required to ensure that the shaft remains joined when used as a training device  10 , and the releasing pressure necessary for smooth operation of the device  10 .  
      In one configuration, the cylindrical component  18  is made of solid stock material with at least one J-shaped groove provided on its surface or cut through the cylinder to receive the pin or pins  16 .  
      During martial arts training, the staff may be converted into martial arts training clubs. To make this conversion, the user grasps the training staff about the middle of a first tubular component  12  with one hand and about the middle of the second tubular component  14  with the other hand, then compresses the first tubular component  12  toward the second tubular component  14 , twisting the tubular components in opposite directions to disengage and then separate them into martial arts training clubs. This action may be reversed to convert the two clubs into a single martial arts training staff.  
      Three Component Martial Arts Training Device  
      Another aspect of the invention provides a device  40  that may be used as a martial arts training staff or for stretching and flexing the user&#39;s legs as a warm up exercise prior to training. The device  40  comprises three tubular units each having at least one joining end, an interior surface and an exterior surface, a connection means affixed within the interior surface of the joining ends to removably affix the tubular units together to form a continuous shaft or staff, and at least two leg attachment means  48  able to be affixed to the exterior surfaces of at least two of the tubular units. In one configuration the staff comprises three tubular units, a first tubular unit  42  having a first end and a second end, a second tubular unit  44  having a third and fourth end and a third tubular unit  46  having a fifth and sixth end.  
      The first and third tubular units,  42  and  46  have internal and external surfaces and a plurality of apertures  50  positioned linearly along their lengths to provide a means for adjustment according to the user&#39;s needs. The three tubular units may be constructed in a similar or identical manner as described above for the two tubular components. In particular their thickness, diameters and material compositions are similar, or identical, to that described for the tubular components.  
      The length of the shaft or staff may vary depending on the height of the user as stated for the two component martial arts training device  40 . For example, if the user is a small person or child a shorter shaft would be preferred for example a shaft not less than about 24 inches and not more than about 48 inches may be appropriate. For a person of five feet in height or taller the shaft may be longer, from not less than about 48 inches to not more than about 72 inches. Preferably the shaft is about 36 inches for a smaller person or child or about 60 inches for a person of five feet in height or taller.  
      The length of the first and third tubular units,  42  and  46  will vary depending on the length of the shaft. If the connection means were positioned approximately one third and approximately two thirds along the length of the shaft the tubular units would be the same or approximately the same length. Consequently, for a shorter staff, one between about 24 inches and about 48 inches, the tubular units would have a length not less than about 8 inches and not more than about 13 inches. Correspondingly, for a longer staff, one between about 48 inches to about 72 inches, the tubular units would have a length of about 13 inches to about 24 inches. If the connection means is not positioned at about one third and about two thirds of the length of the shaft, the first and third tubular units,  42  and  46  may have a different length than the second tubular unit  44 . One skilled in the art would recognize that a wide variety of configurations could be prepared based on the desires of the user, including the first and third tubular units,  42  and  46  being of equal length with the second unit being shorter than the first and third tubular units,  42  and  46 . Correspondingly, the first and third tubular units,  42  and  46  may be of equal length and the second tubular unit  44  is longer than the first and third tubular units,  42  and  46 . Alternatively, each of the tubular units may be of differing size depending on the requirements of the user. Most preferably, the length of the continuous shaft is 60 inches, with each of the tubular units being of approximately equal length.  
      The first and third tubular units,  42  and  46  comprise diametrically opposed apertures  50  arranged linearly along their length at approximately equal spacing. These apertures are used to secure the leg attachment means  48  to the first and third tubular units,  42  and  46  and are of a diameter able to accept the pins  52  affixed to the leg attachment means  48 . The spacing between the apertures  50  will depend on the length of the shaft and the incremental distance that will effect leg stretching desired by the user. With a shorter shaft, the apertures  50  may be spaced closer together while a longer shaft may provide the apertures  50  spaced at a greater distance. Preferably the number of apertures  50  on the first and third tubular units,  42  and  46  remains the same. However, having fewer apertures  50  on a shorter shaft, or a greater number of apertures  50  on a longer shaft is within the scope of the invention. For example, if the shaft is 48 inches in length, the first and third tubular units,  42  and  46  may each have nine apertures  50  spaced apart at approximately 1.6 inches on center. Correspondingly if the shaft is 60 inches, with the first and third tubular units,  42  and  46  having the same number of apertures  50  as in the shorter shaft, the apertures  50  may be spaced apart at about 2.0 inches on center. Preferably, these apertures  50  are spaced equal distances from each other. However, depending on the desires of the user, they may be spaced at differing distances such as, for example, the apertures  50  closest to the second tubular unit  44  might be spaced farther apart than those apertures  50  located more distant from the second tubular unit  44 . Preferably the shaft or staff is about 60 inches in length with the first, second and third tubular units  42 ,  44  and  46  being approximately the same length and the first and third tubular units,  42  and  46  having about nine apertures  50  linearly arranged along their lengths spaced at about 2.0 inches on center.  
      The diameter of the apertures  50  may vary depending on the diameter of the pins  52  affixed to the leg attachment means  48 . Preferably the diameter is not less than about 3/16 inch and not more than about ½ inch.  
      The external surface of the second tubular unit  44  may further comprise a gripping means  54  such as, for example, machined serrations, or leather or rubber wraps. Preferably, the gripping means  54  is a machined surface in aluminum material, which is subsequently anodized.  
      The first tubular unit  42  comprises a connecting means on the second end, the third tubular unit  46  comprises a connecting means on the fifth end and the second tubular unit  44  comprises a connecting means on both ends. More specifically the connecting means on the third end of the second tubular unit  44  is able to receive the connecting means of the first tubular unit  42  and the fourth end of the second tubular unit  44  is able to receive the connecting means of the third tubular unit  46 .  
      In a preferred embodiment, the connecting means consists of a first threaded dowel  56  extending from the second end of the first tubular unit  42 , a second threaded dowel  58  extending from the fifth end of the third tubular unit  46 , with the internal surface of the third end of the second tubular unit  44  being threaded  60  and able to receive the threaded dowel  56  extending from the first tubular unit  42 , and the internal surface of the fourth end of the second tubular unit  44  being threaded  62  and able to receive the threaded dowel  58  extending from the fifth end of the third tubular unit  4 . 6 . Alternatively, the connecting means consists of a first threaded-dowel extending from the third end of the second tubular unit  44 , a second threaded dowel extending from the forth end of the second tubular unit  44 , with the internal surface of the second end of the first tubular unit  42  being threaded and able to receive the threaded dowel extending from the third end of the second tubular unit  44 , and the internal surface of the fifth end of the third tubular unit  46  being threaded and able to receive the threaded dowel extending from the forth end of the second tubular unit  44 . In either configuration it is desired that when the second tubular unit  44  is rotated that the first and third tubular units,  42  and  46  uniformly extend from the second tubular unit  44  when rotation is in one direction and contract toward the second tubular unit  44  when the second tubular unit  44  is rotated in the opposite direction. This may be accomplished in a variety of ways. For example if the threaded dowels are provided on the first and third tubular units,  42  and  46  then it is preferable that the threading on the threaded dowel of the first tubular unit  42  be a right-handed thread and the threading on the threaded dowel of the third tubular unit  46  be a left-hand thread, with the threading on both tubular units being the same pitch. The threading may be provided in variety of orientations that allow for a desired incremental movement of the first and third tubular units,  42  and  46  with respect to the second tubular unit  44 . In a preferred embodiment the threads are provided at about 1 to 3 threads per inch at a pitch of at about a 25 to about a 45-degree orientation. The threaded receiving means may be provided in a variety of configurations. In one configuration, the threaded receiving means is a nut permanently affixed to the internal surface of the tubular unit and able to receive the threaded dowel.  
      The dowels  56  and  58  may be constructed by a variety of methods, for example, they may be form molded as a single piece with the tubular unit, machined from stock material as a single piece with the tubular unit or prepared separately and affixed to the tubular unit. If the dowels  56 - and  58  are prepared by machining they may be cut from solid or tubular stock materials. Depending on the weight desired for the completed staff the user may select either solid stock for a heavier shaft or tubular stock to provide a lighter shaft. Preferably, the dowels  56  and  58  are machined from solid metal stock. Most preferably from solid aluminum stock that may be anodized after machining.  
      If the dowels  56  and  58  are prepared separately, the threading may be provided on not less than about 60 percent and not more than about 90 percent of its length. The remaining 10 to 40 percent of the dowel is provided with an exterior diameter of slightly less than the internal diameter of the tubular unit. This will allow the dowels to be securely affixed within the second end of the first tubular unit  42  and the fifth end of the third tubular unit  46 . The dowels  56  and  58  may be affixed in the tubular units by a variety of methods known to those skilled in the art, such as for example, by welding, brazing, adhesive or press-fit pins or rivets. Alternatively the dowels may be press fit into the tubular units. In the case the outside diameter of the dowel to be press fit into the tubular unit, the outside diameter of the dowel is slightly larger than the internal diameter of the tubular unit.  
      The length of the dowels will vary and depend on the length of the shaft, the desired range of stretching, and the capacity of the second tubular unit  44  to receive both dowels. Preferably the second tubular unit  44  is provided at a length able to receive the full length of the dowels, although this is not a requirement. In addition, the dowel length may be provided to accommodate the user&#39;s desired range of stretching for training purposes. In a preferred embodiment, the length of the shaft is about 60 inches, the length of the tubular units are about 20 inches and the length of the dowels are about 12 inches in which approximately 2 inches of that length is affixed within the tubular units.  
      The receiving means that is provided in the third and forth ends of the second tubular unit  44  may comprise a threaded nut permanently affixed to the interior surface of the second tubular unit  44 . The nuts may be constructed by a variety of methods known in the art, for example they may be form molded with the tubular unit as a single piece, machined from stock material with the tubular unit as a single piece or prepared separately and affixed within the tubular unit. If the nuts are prepared separately they may be cut from solid or tubular stock materials.  
      One skilled in the art would recognize that resistance to travel of the dowels  56  and  58  within the nuts, can be affected by the material used to construct the nuts. In one embodiment, the nuts are made from a material that requires application of an external lube material to enable the dowels to travel within the nuts without binding or galling. For example a lubricant such as Teflon™ grease. Preferably, the material used to construct the nut provides an inherent lubricity to enable the dowels to travel smoothly. Most preferably, the nuts are made from a Teflon-type material for those desiring a lighter staff or a bronze-type material for those individuals desiring a heavier staff.  
      Nuts that are manufactured separately from the second tubular unit  44 , may be permanently affixed to the third and forth ends of the second tubular unit by a variety of methods, such as, for example, by welding, brazing, adhesive, pins, rivets, or press-fit directly into the tubular unit. Alternatively, affixing means may be combined to ensure the nuts remain affixed during utilization of the staff. Nuts that are pressed and/or bonded to the interior surface of the second tubular unit  44 , may comprise an external shoulder matching the outer diameter of the tubular unit. The purpose of said shoulder would be to increase the resistance to migration of the nut within the tubular unit. In a preferred embodiment, the shoulder would be not less than about 1/16″ in thickness, and not more than about ¼″ in thickness.  
      The length of the nuts may vary from a minimum of about 1-inch to not more than about 10 inches, depending upon the desired strength and motion characteristics of the connecting means between the tubular units. Shorter nuts may provide less resistance to travel, while offering lower thread strength and more relative motion between the tubular units. Longer nuts may reduce the amount the dowels move laterally within the nuts, while offering increased resistance to longitudinal dowel travel and thread shear strength. The length of the thread within the nuts may vary with the length of the nut, and may be provided on not less than about 20 percent, and not more 100 percent. In one embodiment, the nuts will be not less than about 1 inch in length, and not more than about 10 inches in length. In a preferred embodiment, each nut will be about 2 inches in length, with the thread extending along the entire length of the nut.  
      The thread in the nut in the third end of the second tubular unit  44  will be a right-hand thread, with a pitch matching that of the dowel on the second end of the first tubular unit  42 . The thread in the nut in the fourth end of the second tubular unit  44  will be a left-hand thread, with a pitch matching that of the dowel on the fifth end of the third tubular unit  46 . Preferably, the pitch of said threads will be about 1 to 3 threads per inch.  
      In one embodiment, at least two leg attachment means  48  are provided. Preferably there is one leg attachment means  48  for each leg. The leg attachment means  48  comprises a flexible strap having a pin  52  for connecting the attachment means  48  to the shaft, and a means to secure the strap to the user&#39;s leg. One skilled in the art would recognize that the means to secure the strap should be easily operated and durable, such as, for example, a buckle, hoop and loop method, D-rings, etc. Preferably, 2-D-rings are permanently affixed to one end of the leg attachment means  48 , to afford infinite adjustability. The D-rings may be wider or narrower than the strap, and D-rings of differing sizes may be installed on the same strap. The preferred configuration consists of 2 similarly sized D-rings, made of metal or plastic, with a nominal 2-inch long straight length for strap.  
      The pins  52  may be permanently or removably affixed to the strap, and are provided in a length that allows them to easily pass through the apertures  50  of the tubular units and securely fastened in place. Preferably the pins  52  are removable, and have a straight section not less than about 1.25 times the external diameter of the tubular units, and not more than about 2 times the exterior diameter of the tubular units.  
      The diameter of the pins  52  is preferably slightly less that the diameter of the apertures  50  in the first and third tubular units,  42  and  46  to provide a relatively snug fit. The pin  52  must incorporate a method to be secured to the shaft during use. Preferably, the pin  52  would have an aperture at the end away from the strap, and a self-retaining device to engage said aperture would be attached to the strap by means of a lanyard. The pin  52  could be constructed of a variety of materials known to those skilled in the art that provide the strength required to maintain the strap on the tubular unit. Preferably, the pins  52  are made of aluminum having a diameter not less than about ⅛ inch and not more than about ⅜ inch.  
      The straps of the leg attachment means  48  may be constructed of a variety of materials known to those skilled in the art, such as for example, nylon, leather, or other synthetic material with the strength and flexibility to provide a comfortable attachment to the legs. The width of the straps may vary depending on the comfort desired by the user. Preferably the width is not less than about 1 inch and not more than about 3 inches.  
      To prevent the leg attachment means  48  from slipping at the legs of the user a restraining means  64  may be removably affixed to both adjustable straps and held in place behind the user. The restraining means  64  may be constructed of a variety of materials known to those skilled in the art, such as for example, nylon, leather, or other synthetic material with the strength and adjustability to allow ease of attachment to the straps and comfort to the user. Preferably, the material is the same as used for the adjustable straps. The width of the restraining means  64  may vary depending on the comfort desired by the user. It may be uniform in width or may vary over its length. For example, the width toward the middle of the strap may be wider than the ends. Preferably the width is not less than about 1 inch and not more than about 6 inches.  
      The retaining means  64  could be comprised of single or multiple components to effect the preferred placement of the leg straps. Preferably, the retaining means  64  will consist of two individual elements, each having a permanent loop to attach to the leg strap on one end, and compatible mating features on the other end. The mating features are to be easily engaged and disengaged, and must afford the ability to adjust the retaining means  64  to suit the strap retention requirements of the user. Preferably, the retaining means  64  will employ two D-rings permanently affixed to one end of a short segment, and a radiused end for ease of engagement, on the mating segment. This approach yields infinite adjustability when used to prevent the legs straps from sliding down the user&#39;s legs during use of the device  40  as a stretching implement. The D-rings may be wider or narrower than the retaining means  64 , and D-rings of differing sizes may be installed on the said means. The preferred configuration consists of two similarly sized D-rings, made of metal or plastic, appropriately sized to the retaining means  64 .  
      Use of the Three Component Martial Arts Training Device  
      To assist flexibility prior to beginning martial arts training, the martial arts training staff may be utilized as a stretching device for the legs. To use the staff as a stretching device the staff must first be assembled. Affix a first tubular unit to a second tubular unit by inserting a right-handed threaded dowel extending from the second end of the first tubular unit into the right-handed threaded nut in the third end of the second tubular unit, then affix a third tubular unit to the second tubular unit by inserting a left-handed threaded dowel extending from the fifth end of the third tubular unit into the left-handed nut in the fourth end of the second tubular unit. To convert the staff to a stretching device, first attach the straps and restraining means (optional) to the user&#39;s legs. If the restraining means is to be employed, the means should be attached to the leg straps and routed behind the user&#39;s back prior to securing the legs straps to the user&#39;s legs. While sitting on the floor with the staff in front of the user affix the right leg to the first tubular unit by inserting the leg strap pin into the desired aperture, and secure the leg strap pin to the tubular unit. The user&#39;s legs should be spread to the maximum extent, then affix the left leg to the third tubular unit by inserting the leg strap pin into the desired aperture, and secure the leg strap pin to the tubular unit. Adjust both leg straps and restraining means such that the straps are secure on the legs, and the restraining means is tight across the users&#39; back. The user may then rotate the second tubular unit, which unthreads the first tubular unit and the third tubular unit extending them from the second tubular unit, thereby assisting in flexing and stretching the user&#39;s legs.