# US 4,681,319 A · Racket having unique string mount > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,681,319 A - Document ID: US4681319A - Status: Granted - Kind: A - Application number: 06/303,361 - Filed: 1981-09-18 - Granted: 1987-07-21 - Earliest claimed: 1978-10-05 - Inventors: Gene Zilinskas - Web page: https://patentgrep.com/patent/US4681319A ## CPC - A63B 49/028: Means for achieving greater mobility of the string bed - A63B 49/022: String guides on frames, e.g. grommets - A63B 2049/0217: {with variable thickness of the head in the string plane} - Y10S 273/23: High modulus filaments - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A racquet is provided having a transverse compliant edge system that supports the racquet strings and has independent elastic transverse movement of the string supports while inhibiting accompanying radial movement. The transverse compliant edge system includes rigid string support rails inside an outer channel in the racquet frame. Each string support rail has an outer groove that contains and supports the racquet string and an inside contact surface supported by the racquet frame and that acts as a pivot point. The string support rails are spaced away from the walls of the outer channel in the racquet frame and the spaces are bridged with compliant material or springs. This arrangement allows the string support rail to rotate about its inside contact surface pivot, thus allowing elastic transverse string movement while inhibiting accompanying radial movement, independent of transverse string movement caused by the elasticity of the ball, strings, or racquet. This transverse compliant edge system enlargens the racquet's `sweet spot`, and increases the ball's dwell-time on the racquet; which improves the hitting power, ball control, and ability to spin the ball by the player using the racquet. ## Claims ### Claim 1 A compliant system comprising: a string for interacting with an object; transverse compliance means for providing transverse compliance of said string in response to interaction with an object, wherein said transverse compliance means includes (a) a string support rail for providing transverse motion of said string, (b) a pin for attaching said string support rail to a frame structure, and (c) elastic material for providing transverse compliance of said string in response to the transverse motion; and a frame structure for mounting said transverse compliance means. ### Claim 2 (depends on 1) The system as set forth in claim 1 above, further comprising means for reducing radial motion. ### Claim 3 (depends on 2) The system as set forth in claim 2 above, wherein said transverse compliance means and said radial motion reducing means are constructed with a pivot having a pivotal axis that permits motion in the transverse direction and having a rigid support that inhibits motion in the radial direction. ### Claim 4 (depends on 2) The system as set forth in claim 2 above, wherein said transverse compliance means and said radial motion reducing means are constructed with a roller having a rolling axis in the transverse direction and having a rigid support in the radial direction. ### Claim 5 (depends on 1) The system as set forth in claim 1 above, wherein said frame structure comprises a racquet frame for supporting said transverse compliance means, said racquet frame including a plurality of holes for passing said string therethrough, wherein said holes are elongated in the transverse direction to reduce friction due to transverse motion. ### Claim 6 (depends on 2) The system as set forth in claim 2 above, wherein said string is arranged in a planar form, wherein said radial motion reducing means is arranged to maintain the planar form of said string by reducing radial motion, and wherein said transverse compliance means is arranged to provide the transverse motion of said planar form string in response to interacting with an object. ### Claim 7 (depends on 2) The system as set forth in claim 2 above, wherein said string has relatively greater friction due to radial motion and relatively lower friction due to transvese motion, wherein said radial motion reducing means inhibits the greater friction-related radial motion, and wherein said transverse compliance means permits the lower friction-related transverse motion for improved motion with reduced friction. ### Claim 8 A compliant system comprising: a string for interacting with an object; transverse compliance means for providing transverse compliance of said string in response to interaction with an object, wherein said transverse compliance means includes (a) a string support rail for supporting said string, (b) a roller for providing transverse motion of said string by rolling on a frame structure, and (c) elastic material for providing transverse compliance of said string in response to the transverse motion; and a frame structure for supporting said roller. ### Claim 9 (depends on 8) The system as set forth in claim 8 above, wherein said frame structure includes (1) an outer surface for supporting said roller and (2) means for mounting said roller to roll on said outer surface. ### Claim 10 (depends on 8) The system as set forth in claim 8 above, wherein said frame structure includes (1) a concave outer surface for supporting said roller and (2) means for mounting said roller to roll on said concave outer surface. ### Claim 11 (depends on 8) The system as set forth in claim 8 above, wherein said frame structure comprises a racquet frame for supporting said transverse compliance means, said racquet frame including a plurality of holes for passing said string therethrough, wherein said holes are elongated in the transverse direction to reduce friction due to transverse motion. ### Claim 12 A racquet system comprising: a string arrangement for hitting a ball; transverse compliance means for providing transverse compliance of said string arrangement in response to hitting of a ball; and a frame for supporting said transverse compliance means, said frame including a plurality of holes elongated in the transverse direction for passing string from said string arrangement therethrough. ### Claim 13 A racquet system comprising: a string arrangement for hitting a ball; a pivot for supporting said string arrangement; transverse compliant means for permitting transverse motion of said pivot supported string arrangement in response to hitting a ball, wherein said pivot is supported in the transverse direction with compliant material; and radial support means for inhibiting radial motion of said pivot supported string arrangement with a rigid radial support in response to hitting a ball, wherein said pivot is supported in the radial direction by rigid material. ### Claim 14 A racquet system comprising: a string arrangement for hitting a ball; a roller for supporting said string arrangement; transverse compliant means for permitting transverse motion of said roller supported string arrangement in response to hitting a ball, wherein said roller has an axis of rolling supported with compliant material in the transverse direction; and radial support means for inhibiting radial motion of said roller supported string arrangement with a rigid radial support in response to hitting a ball, and wherein said roller cannot roll in the radial direction and is supported by rigid material in the radial direction. ### Claim 15 A racquet system comprising: a string arrangement for hitting a ball; transverse compliant means for permitting transverse motion of said string arrangement with a transverse compliance support in response to hitting a ball; radial support means for inhibiting radial motion of said string arrangement with a rigid radial support in response to hitting a ball; and a racquet frame for supporting said transverse compliant means and said radial support means, said frame including a plurality of holes for passing string therethrough, wherein said holes are elongated in the transverse direction to reduce friction due to transverse motion. ### Claim 16 A racquet comprising; string means for hitting a ball; a pivot for supporting said string means; elastic means for providing elastic transverse movement of said pivot supported string means, wherein said pivot is supported in the transverse direction with elastic material; and rigid means for inhibiting radial movement of said pivot supported string means, wherein said pivot is supported in the radial direction with rigid material. ### Claim 17 A racquet comprising: string means for hitting a ball; a pivot for supporting said string means; elastic means for providing compliant pivotal motion in a transverse direction; and rigid means for providing rigid support for said pivot in a radial direction. ### Claim 18 A racquet system comprising a string arrangement having a plurality of strings for hitting a ball and means for reducing friction between strings by permitting transverse motion and by inhibiting radial motion in response to hitting of a ball, wherein said friction reducing means includes pivot means oriented for pivotal motion in the transverse direction and oriented for rigid support in the radial direction. ### Claim 19 A racquet system comprising: a string arrangement having a plurality of strings for hitting a ball and means for reducing friction between strings by permitting transverse motion and by inhibiting radial motion in response to hitting a ball, wherein said friction reducing means includes roller means oriented for rolling motion in the transverse direction and oriented for rigid support in the radial direction.