fig1 shows a general arrangement cross section of the pool cue as conceived in this invention . to aid in understanding this general arrangement , the pool cue is made up of the following items . no . description 10 release mechanism cavity 11 trigger release button spring 12 trigger release button 13 release cylinder 14 barrel spring 15 end plate 16 threaded rod 17 threaded bushing 18 tension adjustment coupler 19 rear impact rod 20 stop edge 21 front impact rod 22 pin 23 machined tip 24 end impact tip 25 threaded connection for cue barrels 26 threaded connection for impact rods 28 rear cue barrel 30 front cue barrel 31 contact point 33 barrel taper 35 drilled opening in rear cue barrel 40 machined recess the cue is made up of two elongated barrels , a front cue barrel 30 and a rear cue barrel 28 . both barrels may be made from materials such as aluminum , titanium , graphite , and wood . a preferred embodiment is to begin with a solid aluminum dowel or billet . the overall length of the cue can vary from a typical four and one half feet long to any length specified by a prospective owner . the barrel outside diameter is preferably 1 . 25 inches . the barrels are preferably made by drilling length wise with a gun drill bit to bore ⅛ inch hole or a 3 / 16 inch hole as illustrated to allow the front impact rod 21 and rear impact rod 19 to freely move . a taper 33 in machined on the outside diameter the front cue barrel 30 and rear cue barrel 28 to match existing cue designs . the outside of the barrels can be given a high quality machined or polished finish . it should be noted that fig1 is not drawn to scale . the length is shortened for the sake of showing the important features of the invention . the front cue barrel 30 and rear cue barrel 28 are carefully machined so that they can be screwed together by male and female threads 25 near the middle of the overall cue length . the machining must be done carefully to ensure that the mating surfaces keep the overall cue assembly straight . the rear cue barrel 28 is also drilled or machined out , preferably to ⅝ inches in diameter and 4 to 6 inches deep , to allow the barrel spring 14 and release mechanism assembly to be inserted into the cue . a stop edge 20 illustrates where the diameter changes . the end diameter of the rear cue barrel 28 is also machined to allow room for the tension adjustment coupler 18 to be assembled . the rear cue barrel 28 is also drilled out 35 , preferably to ⅜ inches in diameter and just deep enough to allow the trigger release button 12 and the trigger release button spring 11 to be inserted . a spring release mechanism cavity 10 is created inside the rear cue barrel 28 by the machining and drilling . the barrel spring 14 and release mechanism assembly is designed to provide for continuously variable energy storage in the barrel spring and provide for a fixed stroke length for striking a billiard ball . the energy stored in the barrel spring 14 is adjusted by an assembly of four parts . a threaded rod 16 is firmly fixed to a threaded tension coupler 18 and an end plate 15 so that they all rotate together . a threaded bushing 17 is fixed to the end of the rear cue barrel 28 by a pin or other means . when the tension adjustment coupler is turned , the threaded rod 16 turns inside the threaded bushing 17 and causes the end plate 15 to move and compress the barrel spring 14 . this assembly provides for a continuously variable amount of stored energy . the stiffness of the spring may be designed to the preference of the owner . the trigger release assembly consists of three important parts . a trigger release button 12 is inserted in the rear cue barrel and also in a release cylinder 13 . a trigger release button spring 11 is under the trigger release button 12 . the mechanism is shown in the locked position with spring force being applied to the trigger release button . when the trigger release button 12 is pressed into the rear cue barrel 28 , the contact 31 between the trigger release button 12 and the release cylinder 13 is removed and the release cylinder 13 then slides forward until the stop edge 20 prevents movement . the trigger release button 12 is machined to a shape that matches slots in the release cylinder 13 to allow the motion to occur . the trigger release button spring 11 helps to prevent unwanted activation of the pool cue by keeping the trigger release button 12 in the locked position until activated by the owner . it also provides for a convenient re - locking action on the trigger release button 12 when getting ready for the next pool shot . a machined recess 40 on the release cylinder 13 provides support for the barrel spring 14 and optionally includes room for a washer to ensure a smooth turning for the barrel spring 14 when the spring compression is adjusted . when the release cylinder 13 is allowed to slide forward , it then pushes the rear impact rod 19 forward . the rear impact rod 19 is firmly threaded into the release cylinder 13 . the rear impact rod 19 is connected to a front impact rod 21 by a threaded connection 26 . the front impact rod 21 is connected to a machined tip 23 which is attached by a pin 22 or other means . the machined tip 23 is then attached to an end impact tip 24 which will actually strike the billiard ball . the attachment design for the end impact tip 24 may be by glue , threading , press fit , or other mounting means . the end impact tip 24 may be a typical material used in pool cues as desired by the owner . the attachment may include the use of a knurled or threaded hole . various designs may be used that allow a quick change . the pool cue may be disassembled for storage by first unscrewing the front impact rod 21 and then unscrewing the front cue barrel 30 . the rear impact rod 19 is prevented from rotating because the release cylinder 13 is prevented from rotating by the trigger release button 12 . the pool cue is reset for the next shot merely by pushing the impact rods and tip assembly back into the cue . the trigger release button spring 11 pushes the trigger release button 12 into the locked position and which holds the cue ready for the next shot . fig2 shows a detail of the release cylinder 13 in a view in the same direction as the release button motion . an enlarged eyehole 39 is designed to engage a larger diameter of the trigger release button 12 and provide a smaller diameter slot 32 that will slide past the trigger release button 12 when the invention is activated . fig3 shows an additional important detail that is omitted in fig1 . a machined aluminum retainer ring 41 is added to the outside diameter of the rear cue barrel 28 . it slides over the length of the cue in the direction as illustrated to lock the trigger release button 12 inside the rear cue barrel 28 and prevent it from falling out . the retainer ring 41 has an outside diameter small enough to allow the trigger release button 12 only enough motion to perform its function and not spring out . in general , the cue can be modified as per the desires of the owner . the overall design provides for the use of a variety of materials . also the cue exterior may be modified by various paints , surface textures , anodizing , and knurling . this invention lends itself very readily to the use by persons with handicaps or disabilities . this invention may be adapted in length to fit for use by the preference or need of the owner . this cue barrels have been designed , in a preferred embodiment , to be made by the use of standard machining techniques from an aluminum dowel or billet . this allows the customization of the cue to the length , surface texture , and appearance specified by an owner . while various embodiments of the present invention have been described , the invention may be modified and adapted to various similar pool cues to those skilled in the art . therefore , this invention is not limited to the description and figure shown herein , and includes all such embodiments , changes , and modifications that are encompassed by the scope of the claims .
a spring activated pool cue is disclosed for use in games such as billiards . the device has also been designed to be taken apart for convenient storage and transport .