An apparatus to keep score during a tennis or other racket match being affixed to a set of racket strings, the apparatus includes a housing having a perimeter, a front surface and a rear surface, each surface configured with indicia to indicate game and set score, said perimeter includes a groove therearound to removeably affix housing to the racket strings, wherein the housing includes a pair of stacked polygon apertures, the front polygon being a hexagon and the second being a pentagon, and a pair of stacked pluggable dials, the front polygon being a hexagon and the second being a pentagon, wherein said pluggable dials include a finger grip, indicator, base or stop, and annular male female snap, and thus to facilitate keeping game and set score during a match and to provide vibrational dampening.

A shock absorber or a racket contains: a body and at least two magnetic elements. The body is mounted on strings of the racket and includes an accommodation groove defined therein, the at least two magnetic elements are housed in the accommodation groove of the body, wherein one of the at least two magnetic elements slides in the accommodation groove of the body, and the at least two magnetic elements are fixed at a same magnetic pole and face to each other so that magnetic repulsion produces between the at least two magnetic elements.

A shock absorber or a racket contains: a body and at least two magnetic elements. The body is mounted on strings of the racket and includes an accommodation groove defined therein, the at least two magnetic elements are housed in the accommodation groove of the body, wherein one of the at least two magnetic elements slides in the accommodation groove of the body, and the at least two magnetic elements are fixed at a same magnetic pole and face to each other so that magnetic repulsion produces between the at least two magnetic elements.

A racket including: a grip; an annular frame provided with a plurality of through holes extending through from an inner peripheral face to an outer peripheral face; a shaft connecting the grip and the frame; and a grommet to be attached to the outer peripheral face of the frame, the grommet including: a plurality of tube sections to be inserted into each of the plurality of through holes provided to the frame; and a base section that connects the plurality of tube sections to one another, the tube sections each including a communicating hole that communicates a base section side opening on the base section side with a tip end side opening on the side to be inserted through the through hole, the tip end side openings of at least some number of the tube sections, of the plurality of tube sections through which a string to be strung in a direction along a longitudinal direction of the racket is inserted, being wider than the base section side openings in a direction in which the plurality of tube sections is arranged.

[Object] To analyze a contact phenomenon between objects can with a simpler configuration.

[Solution] Provided is an analysis apparatus including: an acquisition unit configured to acquire vibration data showing a vibration generated in a first object by having a second object come into contact with a first position on the first object; a first analysis processing unit configured to specify the first position by comparing a vibration characteristic shown by the vibration data, and a vibration characteristic defined for each position where the second object may come into contact with the first object; and a second analysis processing unit configured to estimate a velocity after the contact of the second object based on a velocity of the first object and the first position.

[Object] To analyze a contact phenomenon between objects can with a simpler configuration.

[Solution] Provided is an analysis apparatus including: an acquisition unit configured to acquire vibration data showing a vibration generated in a first object by having a second object come into contact with a first position on the first object; a first analysis processing unit configured to specify the first position by comparing a vibration characteristic shown by the vibration data, and a vibration characteristic defined for each position where the second object may come into contact with the first object; and a second analysis processing unit configured to estimate a velocity after the contact of the second object based on a velocity of the first object and the first position.

An apparatus including a sensor carried by a racquet and an indicator in communication with the sensor. The sensor outputs a notification based on (a) the number of hits by the racquet based on signals from the sensor and (b) at least one of an elapsed time since a last stringing of the racquet and an input skill level of a person using the racquet. Additionally, an apparatus including a racquet, a sensor carried by the racquet, and an indicator in communication with the sensor. The sensor can be a strain gauge, a load cell, an acoustic sensor and a vibro-acoustic sensor. The sensor outputs a notification based on the number of hits by the racquet based on signals from the sensor.

An apparatus including a sensor carried by a racquet and an indicator in communication with the sensor. The sensor outputs a notification based on (a) the number of hits by the racquet based on signals from the sensor and (b) at least one of an elapsed time since a last stringing of the racquet and an input skill level of a person using the racquet. Additionally, an apparatus including a racquet, a sensor carried by the racquet, and an indicator in communication with the sensor. The sensor can be a strain gauge, a load cell, an acoustic sensor and a vibro-acoustic sensor. The sensor outputs a notification based on the number of hits by the racquet based on signals from the sensor.

A shatter proof enclosure and mount for a motion capture element that couples to equipment, where the enclosure and optionally the mount is shatter proof or shatter resistant. Exposed areas of the enclosure or mount or both that are subject to impact may be covered with a protective layer that prevents fragments of the enclosure or internal components from exiting the layer, even in the event of an impact. For example, the protective layer may incorporate flexible materials such as silicone rubber. Alternatively, the protective layer may be rigid but effectively unbreakable, using materials such as polycarbonate. The protective layer may also include a mesh that prevents internal components from existing the enclosure.

A golf club simulation apparatus includes an elongate shaft housing having opposed lower and upper ends and defining an interior area. A club head member is coupled to the lower end of the shaft housing. A battery is situated in one of the club head member and the shaft housing. An input member configured to receive club selection data is coupled to an outer surface of the shaft housing and electrically connected to the battery. A mass variability assembly is electrically connected to the input member and includes a weight member situated in the shaft housing that is selectively movable therein according to the club selection data. An electronics module having an angular sensing sensor is situated in the club head member. A bend variability assembly is included in the shaft housing for selectively altering a feel characteristic of the shaft housing during a swing motion.