Abstract: A portable swing trainer has a wedge body of a triangular shape, and a stick sensor having a vertical adjustment and a horizontal adjustment. The stick sensor has a deployed position and a collapsed position. The stick sensor is mounted behind the wedge body. A restoring mechanism can be for restoring the stick sensor from the collapsed position to the deployed position. The restoring mechanism is mounted behind the wedge body. The stick sensor is pivotally mounted to the restoring mechanism. A catch mechanism is for catching the stick sensor in collapsed position. The catch mechanism is mounted behind the wedge body. A pair of electronic beam sensors can be mounted in a pair of depressions formed on a face of the wedge body.

Abstract: A golf swing modeling device includes a base having a first row of sensors, a striking row of sensors, a second row of sensors and a third row of sensors. The various sensors output individual signals. The striking row of sensors comprises a striking row inside sensor and a striking row outside sensor. A ball striking assembly has a lower ball mounted on a lower ball arm which is mounted on a lower retainer and an upper ball mounted on an upper ball arm which is mounted on an upper retainer. The upper ball has a sensor which outputs a signal when struck. A striking face of the lower ball is placed between the striking row inside sensor and striking row outside sensor. A processor receives individual signals from the sensors. The processor calculates club speed, and club head orientation from individual signals, and the processor provides output.

Abstract: A golf swing assistance device has a base having a flat upper surface with a hitting spot, a shallow lower surface indented adjacent to a hitting spot of the upper surface. The hitting spot is located in the middle of a golf swing that a user takes. A rear position sensor is located behind the golf swing, and behind the hitting spot. A front position sensor is located after the swing and in front of the hitting spot. A ball holder has a ball holding plate, a ball holding arm and a ball holder connector. A block receives the ball holder connector. An adjusting mechanism allows vertical adjustment of the ball holder connector. A ball target has a ball end, a ball target arm and a ball target connector. Also, position sensors mounted on stands can monitor other sections of the golf swing.

Abstract: A Golf “Swing For Accuracy” Mat for promoting accurate and consistent contact between a golf club and a golf ball as a golfer swings the golf club, wherein the first preferred embodiment of the Golf “Swing For Accuracy” Mat includes a mat, a ball device including an upper sphere having a connecting arm, a lower sphere having a connecting arm, wherein the two spheres are vertically aligned above the mat with a predetermined distance between the spheres, and a means for supporting the ball device in position above the mat.

Abstract: An American football includes a ball cover including four elliptical cover pieces sewn edge to edge together, wherein each cover piece comprises an outer elliptical cover skins, an elliptical inner lining for supporting between the outer cover skin, and an air layer having an predetermined elliptical shape disposed between the outer cover skin and the inner lining, and an inflatable bladder disposed within said ball cover for propping up said ball cover after inflation. So, a predetermined volume of air is provided in the air layer for increasing the elasticity of the outer cover skin, so as to increase the softness of the American football with lower manufacturing cost.

Abstract: A golf swing practice device for assisting a golfer in the development of a correct golf swing includes a flat support base, an upright supporting member extending upwardly from a surface of the base, and a bracket vertically adjustably mounted on the upright member. An arm extends laterally and is angularly adjustably mounted on the bracket. At least one, and preferably several pendulum members are suspended on the arm to serve as indicators that a practice golf swing did not travel in an optimum intended swing path.