# US 7,611,447 B2 · Leg exercise device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,447 B2 - Document ID: US7611447B2 - Status: Granted - Kind: B2 - Application number: 10/516,509 - Filed: 2003-06-03 - Published: 2006-07-13 - Granted: 2009-11-03 - Earliest claimed: 2002-06-03 - Inventors: Vimala Sarma - Web page: https://patentgrep.com/patent/US7611447B2 ## CPC - A63B 23/03533: {With separate means driven by each limb, i.e. performing different movements} - A63B 21/00069: {Setting or adjusting the resistance level; Compensating for a preload prior to use, e.g. changing length of resistance or adjusting a valve} - A63B 21/008: using hydraulic or pneumatic force-resisters - A63B 21/0085: {using pneumatic force-resisters} - A61H 2209/00: Devices for avoiding blood stagnation, e.g. Deep Vein Thrombosis [DVT] devices - A63B 22/16: Platforms for rocking motion about a horizontal axis {, e.g. axis through the middle of the platform}; Balancing drums; Balancing boards or the like {(exercising apparatus with cantilevered support elements pivoting about an axis A63B22/0056; other exercising apparatus for improving balance A63B26/003)} - A63B 2225/30: Maintenance - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N) ## Abstract A foot and/or leg-exercising device (10) has a first sealed chamber (14) and a second sealed chamber (16) that are interconnected via one or more passageways (34). The chambers (14, 16) are of variable volume and fluid within one chamber may be pumped to the other chamber using the feet and/or legs. In one embodiment each foot is provided with a first chamber and a second chamber and fluid is pumped by a heel and toe rocking action of each foot. The chambers for both feet may be interconnected to allow pumping by an up and down action of the legs. ## Claims ### Claim 1 A leg exercise device having: a rigid base; two first separately sealed variable volume chambers mounted on or partially defined by the base; two second separately sealed variable volume chambers mounted on or partially defined by the base; a volume of fluid less than the combined maximum volume of the first and second chambers being located in each pair of first and second chambers; two first surfaces, each sized and located to receive a respective first part of each of a user's feet and convey compressive force between the first part and a respective first chamber, and two second surfaces, each sized and located to receive a respective second part of each of a user's feet and convey compressive force between the second part and a respective second chamber, and a valve; at least one passageway interconnecting each of said chambers with said valve; said valve having first and second states, wherein: when in the first state the valve isolates first chambers from second chambers and links, via respective passageways, the first chamber provided for one foot with the first chamber provided for the other foot and links, via respective passageways, the second chamber provided for one foot with the second chamber provided for the other foot, and when in the second state the valve isolates chambers of one foot from the chambers of the other foot and links, via respective passageways, the first chamber provided for one foot with the second chamber provided for the one foot and, via respective passageways, links the first chamber provided for other foot with the second chamber provided for the other foot. ### Claim 2 (depends on 1) The device of claim 1 wherein each of said first surfaces includes at least part of the respective first chamber. ### Claim 3 (depends on 1) The device of claim 1 wherein each of said second surfaces includes at least part of the respective second chamber. ### Claim 4 (depends on 1) The device of claim 1 wherein at least part of one of the first and second chambers is defined by a flexible wall or membrane. ### Claim 5 (depends on 4) The device of claim 4 wherein the flexible wall membrane is formed of an elastic material. ### Claim 6 (depends on 4) The device of claim 4 wherein the flexible membrane is formed of a substantially inelastic material. ### Claim 7 (depends on 1) The device of claim 1 further including at least one flexible membrane attached to the base, the base and at least part of the at least one flexible membrane defining at least one first chamber. ### Claim 8 (depends on 7) The device of claim 7 wherein the at least one flexible membrane defines at least one first chamber and at least one second chamber. ### Claim 9 (depends on 7) The device of claim 7 wherein the base has a recess for each chamber. ### Claim 10 (depends on 7) The device of claim 7 wherein the base has a substantially non-recessed surface on which the flexible membrane is mounted. ### Claim 11 (depends on 7) The device of claim 7 wherein the flexible membrane is secured to the base with at least one clamp. ### Claim 12 (depends on 7) The device of claim 7 wherein the at least one passageway includes at least one recesses in a surface of the base. ### Claim 13 (depends on 1) The device of claim 1 wherein the at least one passageway includes at least one external tube communicating one chamber with said valve. ### Claim 14 (depends on 1) The device of claim 1 wherein the base includes first and second portions mounted to each other about a hinge line. ### Claim 15 (depends on 14) The device of claim 14 wherein said first and second portions each include one first and one second chamber. ### Claim 16 (depends on 1) The device of claim 1 including at least one opening to at least one chamber through which fluid may be selectively introduced into or removed from the chamber. ### Claim 17 (depends on 1) The device of claim 1 wherein the resistance to fluid flow between the first and second chambers is the same in both directions. ### Claim 18 (depends on 1) The device of claim 1 including at least one mounting for attachment of the device to another object. ### Claim 19 (depends on 1) The device of claim 1 wherein the base comprises a footrest for one or two of a user's feet.