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2 and the force on the pull rope 4 constitute a force triangle,
         since the tension ropes are immobilized, the sides where the
         resultant forces of the guide rope 1 and tension ropes 2 exist
         in the force triangle are approximately in constant lengths.
         Speed rope and handle assembly
         Pat. 9,492,699 U.S. class A63B 5/20 Int. class A63B 5/20
         Inventor: John Angelo Carpinelli, Napa, CA., George Jeffery
         Mowry, Westcliffe, CO.
         Assignee: Impulse Footcare, LLC., Durham, NC.
           This patent presents a jump rope assembly comprising
         a rope, a handle at one end of the rope, an axially extend-
         ing axle mounted in bearings within the handle for rotation
         about its axis, a gimbal head affixed to the axle at one end of
         the handle including a ring with a circular opening having
         an axis perpendicular to the axis of the axle, and a spherical
         ball of greater diameter than the opening pivotally seated
         against one side of the ring, with an end portion of the rope
         passing  freely  through  the  opening  and being  attached to
         the ball in a manner permitting the ball to pivot freely with
         respect to the axis of the opening as the gimbal head rotates
         about the axis of the axle.
           In the embodiment illustrated in figures 20-24, the rope
         is a wire rope with strands of wire 13 twisted together and
         encased in a coating or jacket  14 of a polyamide  such as
         nylon, polyvinyl chloride (PVC), or other suitable material.
         The size and stiffness of the wire are chosen in accordance
         with the stiffness and weight desired for the rope, and in one
         exemplary embodiment, the rope consists of seven strands
         of galvanized steel wire that are twisted together to form a
         cable having a diameter of about 1.8 mm in a nylon jacket
         having a diameter of about 2.4 mm. This rope has a length of
         10 feet. However, the rope can be made any size desired and
         of any suitable materials.
           Each of the handle assemblies has a tubular body 16 of
         generally circular cross section, with a grip section 16a and
         a barrel 16b toward opposite ends thereof, with an axially
         extending bore 17 opening through the two ends. The han-  percent from the rear of the grip to the front. The barrel also
         dle is ergonomically designed, with the grip section being   has a generally cylindrical side wall 22 with a conical taper
         of greater diameter than the barrel and a short taper 16c   of about 2.5 degrees relative to the axis, decreasing in diam-
         between the two sections. The grip section has a generally   eter from the grip to the front end of the handle. The transi-
         cylindrical side wall 19 with an outer surface that is slightly   tion section between the grip section and barrel is tapered at
         convex and conically tapered. The taper is at an angle of ap-  an angle of approximately 45 degrees.
         proximately 4 degrees relative to the axis 21 of the handle,   In the embodiment  illustrated, the body  is fabricated  of
         with the outer diameter of the grip increasing by about 8   a rigid plastic material which can, for example, be a modi-
                                                              fied or co-polyester such as the Tritan® TX-1000 copolyester
                                                              material available from Eastman Chemical Company. To
                                                              enhance  the  gripping properties and feel  of  the  handle,  a
                                                              sleeve  23  of  elastomeric  material such  as  a  thermoplastic
                                                              elastomer (TPE) or rubber is applied to the grip section of
                                                              the body and to a portion of the barrel. This sleeve fits into
                                                              a recessed area 24 in the body and overlies the entire grip
                                                              section and the transition section, with rounded tabs 23a ex-
                                                              tending forward on opposite sides of the barrel. In addition
                                                              to making the handle easier to grip, the elastomeric mate-
                                                              rial also provides cushioning that makes the handle more
                                                              comfortable to grip.
                                                               A gimbal head 26 is affixed to an axle 27 at the front of
                                                              the body for rotation about axis 21. The axle extends along
                                                              the axis and is rotatively mounted in a bearing assembly 28
                                                              within the handle. The bearing assembly includes a pair of
                                                              low friction ball bearings 29, 31 which are spaced apart along
                                                              the axis and centered about it. The axle passes through the
                                                              bearings and is constrained from axial movement by an en-
         Figure 20: Isometric view of one embodiment of a jump rope and   larged head 27a at one end of the axle, a cylindrical spacer
         handle assembly.                                                                      continued on next page

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