# US 2014/0155226 A1 · Low noise wrist strength training ball > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155226 A1 - Document ID: US20140155226A1 - Status: Published application - Kind: A1 - Application number: 13/791,521 - Filed: 2013-03-08 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Nano-Second Technology Co., Ltd. - Applicants: Nano-Second Technology Co., Ltd. - Inventors: Pei-Sung CHUANG - Web page: https://patentgrep.com/patent/US20140155226A1 ## CPC - A63B 23/14: for wrist joints - A63B 21/0004: {Exercising devices moving as a whole during exercise (bar bells or dumb bells A63B21/072; on wheels A63B22/20)} - A63B 21/22: Resisting devices with rotary bodies {(A63B21/0608 takes precedence)} - A63B 21/222: {by overcoming gyroscopic forces, e.g. by turning the spin axis} - A63B 2071/0063: {Shock absorbers} - A63B 2209/08: magnetic - A63B 2225/30: Maintenance - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract A low noise wrist strength training ball includes a case, a sleeve ring, a rotary body and a magnetic element. The sleeve ring is slidably disposed inside the case and is adapted for sliding relative to the case. The rotary body includes two protruding shafts opposite to each other. The two protruding shafts are pivotally connected to the sleeve ring and are adapted for rotating relative to the sleeve ring. The magnetic element is disposed in the sleeve ring and corresponds to one of the two protruding shafts. The magnetic element is adapted for magnetically attracting the one of the protruding shafts to press against the sleeve ring. ## Claims ### Claim 1 A low noise wrist strength training ball, comprising: a case; a sleeve ring slidably disposed inside the case and adapted for sliding relative to the case; a rotary body comprising two protruding shafts opposite to each other, the two protruding shafts being pivotally connected to the sleeve ring and adapted for rotating relative to the sleeve ring; and a magnetic element disposed in the sleeve ring and being corresponding to one of the two protruding shafts, and wherein the magnetic element is adapted for magnetically attracting the one of the protruding shafts to press against the sleeve ring. ### Claim 2 (depends on 1) The low noise wrist strength training ball according to claim 1, wherein the case has an accommodating space and an annular groove, the annular groove is disposed on an inner wall surface of the case forming the accommodating space therein, the rotary body is disposed in the accommodating space, the annular groove surrounds the rotary body, the two protruding shafts are pressed against the annular groove, respectively. ### Claim 3 (depends on 2) The low noise wrist strength training ball according to claim 2, wherein the case comprises a first case portion and a second case portion, the second case portion is installed on the first case portion to form the accommodating space together. ### Claim 4 (depends on 1) The low noise wrist strength training ball according to claim 1, wherein the sleeve ring comprises two pivotal portions opposite to each other, the two protruding shafts are pivotally connected to the two pivotal portions, respectively, for causing the rotary body to rotate relative to the sleeve ring. ### Claim 5 (depends on 4) The low noise wrist strength training ball according to claim 4, further comprising an elastic device, the rotary body having a hollow groove, one side of the elastic device being fixed inside the hollow groove, and the other side of the elastic device being fixed on one of the two pivotal portions of the sleeve ring. ### Claim 6 (depends on 5) The low noise wrist strength training ball according to claim 5, wherein the magnetic element is disposed in the one of the pivotal portions assembled with the elastic device, and the magnetic element is adapted for magnetically attracting the protruding shaft close to the elastic device to press against the one of the pivotal portions close to the elastic device. ### Claim 7 (depends on 6) The low noise wrist strength training ball according to claim 6, wherein each of the two pivotal portions has a through hole, the two protruding shafts penetrate through the two through holes, respectively, the one of the pivotal portions assembled with the elastic device has an accommodating groove, the accommodating groove is close to the through hole of the one of the pivotal portions assembled with the elastic device, the magnetic element is installed in the accommodating groove for magnetically attracting the one of the protruding shafts close to the elastic device to press against an inner wall surface of the corresponding through hole. ### Claim 8 A low noise wrist strength training ball, comprising: a case; a sleeve ring slidably disposed inside the case and sliding relative to the case; a rotary body comprising two protruding shafts opposite to each other, the two protruding shafts being pivotally connected to the sleeve ring and adapted for rotating relative to the sleeve ring; and a shock damping component disposed on the sleeve ring and being corresponding to one of the two protruding shafts, and the shock damping component being pressed against the one of the protruding shafts. ### Claim 9 (depends on 8) The low noise wrist strength training ball according to claim 8, wherein the sleeve ring comprises two pivotal portions opposite to each other, the two protruding shafts are pivotally connected to the two pivotal portions, respectively, for causing the rotary body to rotate relative to the sleeve ring. ### Claim 10 (depends on 9) The low noise wrist strength training ball according to claim 9, further comprising an elastic device, the rotary body having a hollow groove, one side of the elastic device being fixed inside the hollow groove, and the other side of the elastic device being fixed on one of the two pivotal portions of the sleeve ring. ### Claim 11 (depends on 10) The low noise wrist strength training ball according to claim 10, wherein the one of the pivotal portions assembled with the elastic device has an accommodating groove, the accommodating groove is close to the one of the pivotal portion assembled with the elastic device, the shock damping component is installed in the accommodating groove for the shock damping component to press against the one of the protruding shafts close to the elastic device. ### Claim 12 (depends on 11) The low noise wrist strength training ball according to claim 11, wherein the shock damping component comprises an elastic element and a shock absorbing body, the elastic element and the shock absorbing body are disposed in the accommodating groove, and the shock absorbing body is closer to the protruding shaft than the elastic element normally, and the elastic element causes the shock absorbing body to move toward the one of the protruding shafts for pressing against the one of the protruding shafts close to the elastic device. ### Claim 13 A low noise wrist strength training ball, comprising: a case comprising a first case portion, a second case portion, a first concave portion and a second concave portion, the first concave portion and the second concave portion being disposed on the circumference of the first case portion and the circumference of the second case portion, respectively, the second case portion being installed on the first case portion for forming an accommodating space together, the first concave portion and the second concave portion forming an annular groove together, the annular groove having a contact surface, each of the first concave portion and the second concave portion having an inner surface and an outer surface opposite to each other, and the contact surface being connected to the inner surfaces; a sleeve ring slidably disposed inside the annular groove and adapted for sliding relative to the case; and a rotary body comprising two protruding shafts opposite to each other, the two protruding shafts being pivotally connected to the sleeve ring and adapted for rotating relative to the sleeve ring, the two protruding shafts being respectively attached on the contact surface, and ends of the two protruding shafts being disposed between the inner surfaces and the outer surfaces respectively.