Abdominal weight lifting apparatus
Patent 4387893 Issued on June 14, 1983. Estimated Expiration Date: 
May 6, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 6, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1969901 3858873 Variable resistance exercising device Patent #: 4256302 InventorAssigneeApplicationNo. 06/261260 filed on 05/06/1981US Classes:482/137, About a horizontal axis482/100Pivoted user interface elementExaminersPrimary: Pinkham, Richard C.Assistant: Browne, William R. Attorney, Agent or FirmInternational ClassesA63B 21/06 (20060101)A63B 21/00 (20060101) A63B 21/062 (20060101) AbstractAn exercising apparatus in which the body is supported while being restricted to rotary movement of upper and lower torso portions one relative to the other. Restriction of movement isolates the abdominal muscle group while accomplishing "full range" exercise as herein defined.The apparatus includes an upper torso engaging backrest and a lower torso engaging backrest and seat so that the user is supported in a generally seated position. Weights and a variable cam provide a variable resistance force to pivotal movement when the upper torso engaging backrest and the lower torso engaging backrest and seat are moved toward and away from each other. | |
