# US 5,704,881 A · Apparatus for counterbalancing rehabilitating patients > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,881 A - Document ID: US5704881A - Status: Granted - Kind: A - Application number: 08/546,689 - Filed: 1995-10-23 - Granted: 1998-01-06 - Earliest claimed: 1995-10-23 - Assignees: LiftAire - Inventors: Robert H. Dudley - Web page: https://patentgrep.com/patent/US5704881A ## CPC - A63B 22/0235: {driven by a motor} - A63B 21/00181: {comprising additional means assisting the user to overcome part of the resisting force, i.e. assisted-active exercising} - A63B 69/0064: {Attachments on the trainee preventing falling} - A63B 71/0009: {for handicapped persons} - A61H 3/008: {using suspension devices for supporting the body in an upright walking or standing position, e.g. harnesses} - A61H 2201/0157: portable - A61H 2201/0165: Damping, vibration related features - A61H 2201/1616: Holding means therefor - A61H 2201/1621: Holding means therefor - A61H 2201/1635: Hand or arm, e.g. handle - A61H 2201/164: Feet or leg, e.g. pedal - A61H 2201/1652: Harness - A63B 3/00: Parallel bars or similar apparatus - A63B 21/4007: {to the chest region, e.g. to the back chest} - A63B 2071/0683: {Input by handheld remote control} - A63B 2225/50: Wireless data transmission, e.g. by radio transmitters or telemetry - 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 counterbalancing assembly reduces the weight of an exercising person by pulling the exercising person upwardly. The counterbalancing assembly includes a monolithic support structure which is secured to a base. A cantilever support extends out from the top of the monolithic support structure. A cable extends from the top of the monolithic support structure, down through a linear actuator, and back up through the monolithic support structure to the cantilever support. The cable extends down from the end of the cantilever support to a position suitable for an exercising person to comfortably exercise on a piece of exercising equipment. A spring at the fixed end of the cable provides an unloading force accommodating to the exercising patient movement and dampens sudden movements created by the exercising person. A linear actuator is used to adjust the length of the cable extending down from the cantilever support and to tension the spring. ## Claims ### Claim 1 A counterbalance assembly for reducing the weight of an exercising person, said counterbalancing assembly comprising: a base; a monolithic support structure extending upwardly substantially perpendicular to ground, said monolithic support structure defining a base engaging end and a top end, said base engaging end secured to said base; a cantilever support fixedly secured to said top end extending out from said monolithic support structure generally perpendicularly thereto; a flexible force transmitting device having a fixed end, a load bearing end, and a length therebetween, said flexible force transmitting device extending through said monolithic support structure and said cantilever support, said load bearing end extending down from said cantilever support; a harness secured to said load bearing end to receive the exercising person disposed outside and adjacent to said monolithic support structure; a linear adjuster secured to said flexible force transmitting device to move said load bearing end upwardly; and a resilient member operatively connected to said flexible force transmitting device in a manner in which said resilient member is compressed when the exercising person exerts a downward force on said load bearing end thereby dampening pulses of force received by the exercising person in a linear fashion, said resilient member including a spring fixedly secured to said top end of said monolithic support structure. ### Claim 2 (depends on 1) A counterbalance assembly as set forth in claim 1 wherein said linear adjuster is secured to said flexible force transmitting device along said length thereof. ### Claim 3 (depends on 2) A counterbalance assembly as set forth in claim 2 including a plurality of directional members disposed adjacent said flexible force transmitting device to alter the direction of the force received by the exercising person. ### Claim 4 (depends on 3) A counterbalance assembly as set forth in claim 3 wherein said linear adjuster is a linear actuator. ### Claim 5 (depends on 4) A counterbalance assembly as set forth in claim 4 wherein said flexible force transmitting device is a cable. ### Claim 6 (depends on 5) A counterbalance assembly as set forth in claim 5 wherein said plurality of direction members is a plurality of pulleys. ### Claim 7 (depends on 6) A counterbalance assembly as set forth in claim 6 wherein said base includes first, second, and third legs. ### Claim 8 (depends on 7) A counterbalance assembly as set forth in claim 7 wherein said third leg extends out from said monolithic support structure below said cantilever support. ### Claim 9 (depends on 8) A counterbalance assembly as set forth in claim 8 wherein said monolithic support structure includes a plurality of controls electrically connected to said linear actuator to remotely control said linear actuator. ### Claim 10 A counterbalance assembly for reducing the weight of an exercising person, said counterbalancing assembly comprising: a base; a monolithic support structure defining a housing and extending upwardly substantially perpendicular to ground, said monolithic support structure defining a base engaging end and a top end, said base engaging end fixedly secured to said base; a cantilever support fixedly secured to said top end extending out from said monolithic support structure generally perpendicular thereto; a flexible force transmitting device having a fixed end, a load bearing end, and a length therebetween, said flexible force transmitting device extending through said housing and said cantilever support, said load bearing end extending down from said cantilever support; a harness secured to said load bearing end to receive the exercising person; a linear adjuster secured to said flexible force transmitting device to adjust said load bearing end upwardly such that the exercising person experiences reduced weight by pulling the exercising person up countering gravity; and a tension spring assembly secured to said monolithic support structure and said fixed end of said flexible force transmitting device in a manner in which said tension spring assembly is linearly compressed when the exercising person exerts a downward force on said load bearing end thereby dampening pulses of force received by the exercising person. ### Claim 11 (depends on 10) A counterbalance assembly as set forth in claim 10 including a weight reduction scale to measure said force provided by said tension spring assembly. ### Claim 12 (depends on 11) A counterbalance assembly as set forth in claim 11 wherein said weight reduction scale is fixedly secured to said tension spring assembly. ### Claim 13 (depends on 12) A counterbalance assembly as set forth in claim 12 including a remote control device for remotely controlling said linear adjuster.