1
Rick A Elstein, Svein Faret, John J Gazzo: Sports technique and reaction training system. Innovating Training Products, Scully Scott Murphy & Presser, October 27, 1987: US04702475 (367 worldwide citation)

A system for technique and accelerated reaction training of a person by a training program in which an array of lights is positioned visibly in front of the person, with each light signifying a different particular movement pattern to be executed by the person in a given amount of time. A control sy ...


2
Samuel F Stewart: Racket weighting means. Lee & Smith, October 4, 1977: US04052061 (60 worldwide citation)

An improved racket weighting device for use with any existing racket having a shaft with a throat connected to a frame during warm-up, practice or actual play in sports such as tennis, badminton, squash or the like. The device includes a non-continuous flexible member adapted to be wrapped at least ...


3
Bjorklund Leon V, Hubbard Richard T: Arm exercising device. Wells St John & Roberts, June 4, 1974: US3814419 (56 worldwide citation)

A device for exercising the extensor muscles of the arm comprises two elongated rigid arm members connected together by a pair of coil springs for pivotal movement about a transverse axis. The arm members include straps for mounting the device to a user's arm with one arm member alongside the user's ...


4
Koch Alvin F: Athletic testing device. Von Behren Esq Norvell E, July 29, 1975: US3897058 (47 worldwide citation)

An athletic testing device for use by athletes in a game where an athletic club is utilized for playing the game and where a controlled force application on the club handle by the user's hand or hands is desirous as the club is swung. The testing device is adapted to be used with a golf club, a tenn ...


5
Hurwitz Arthur: Aid for relieving or preventing tennis elbow injury. Miller Gustave, January 7, 1975: US3858881 (37 worldwide citation)

This device is a tennis aid for assisting the tennis player in holding the tennis racquet at the proper angle and for acting as a preventive against developing 'tennis elbow' or arm strain or injury, as well as providing relief to those who already have such difficulties with their elbow or forearm. ...


6
Zak Thomas J: Tennis training ball target and projector. Dominik Knechtel Godula & Demeur, November 11, 1975: US3918711 (36 worldwide citation)

A tennis trainer assembly for use indoors or outdoors wherein a user practices tennis shots from a user's mat with feet indicia recommending stances for forehand and backhand shots. The user drives a ball toward a non-rebound target which intercepts the driven ball and drops it into a lower trough m ...


7
Alan W Marty, Thomas A Edwards, Ridge McGhee: Trajectory detection and feedback system. Pillar Vision, Kwan & Olynick, January 7, 2014: US08622832 (35 worldwide citation)

A disclosed device provides a trajectory detection and feedback system. The system is capable of detecting one or more moving objects in free flight, analyzing a trajectory of each object and providing immediate feedback information to a human that has launched the object into flight, and/or one or ...


8
William E Lancellotti: Tennis elbow brace. Salter & Michaelson, March 4, 1980: US04191373 (33 worldwide citation)

A brace adapted for wear by a tennis player for minimizing and/or preventing tennis elbow comprising in its most basic form a pair of discs adapted for respective generally nonslip compressive contact with that portion of the player's arm directly overlying the medial and lateral eipcondyles thereof ...


9
Oppenheimer Jess: Swing-accommodation apparatus. Nilsson Robbins Bissell Dalgarn & Berliner, April 8, 1975: US3876212 (29 worldwide citation)

A device for training a user to properly swing an implement such as a golf club. The device includes an overhead arched support mounted on rollers, which support is adapted to be rotated about a fixed axis to selected positions on a supporting surface. Extending downward from the support, and slidea ...


10
William O Dollar Jr, Kenneth D Smith: Golf swing position indicator. Mitchell B Wasson, Raphael V Lupo, Martin P Hoffman, December 6, 1988: US04789160 (28 worldwide citation)

A device for insuring that the striking surface of a sports implement is properly oriented prior to the initiation and completion of a contact swing. Two position orientation sensors are affixed to the shaft of the sports implement. One sensor senses the roll position of the striking surface, and th ...