Land vehicles – Skates – Runner type
Patent
1995-09-29
1999-01-12
Boehler, Anne Marie
Land vehicles
Skates
Runner type
280601, 310317, 310326, 473282, 473318, 473521, A63C 5075
Patent
active
058576940
ABSTRACT:
A sports implement including an electroactive element, such as a piezoceramic sheet attached to the implement and a circuit attached to the electroactive element. The circuit may be a shunt, or may include processing such as amplification and phase control to apply a driving signal which may compensate for strain sensed in the implement, or may simply alter the stiffness to affect performance. In a ski, the electroactive element is located near to the root in a region of high strain to apply damping, and the element captures between about one and five percent of the strain energy of the ski. The region of high strain may be found by modeling mechanics of the sports implement, or may be located by empirically mapping the strain distribution which occurs during use of the implement. In other embodiments, the electroactive elements may remove resonances, adapt performance to different situations, or enhance handling or comfort of the implement. Other embodiments include striking implements intended to hit a ball or object in play, such as golf clubs and tennis racquets, wherein the strain elements may alter the performance, feel or comfort of the implement.
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patent: 5499836 (1996-03-01), Juhasz
patent: 5590908 (1997-01-01), Carr
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patent: 5645260 (1997-07-01), Falangas
Allen Jonathan C.
Jacques Robert N.
Lazarus Kenneth B.
Moore Jeffrey W.
Active Control Experts, Inc.
Boehler Anne Marie
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