# US 5,066,004 A · Leg extension exercise machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,066,004 A - Document ID: US5066004A - Status: Granted - Kind: A - Application number: 07/573,553 - Filed: 1990-08-27 - Granted: 1991-11-19 - Earliest claimed: 1990-08-27 - Assignees: Hammer Corporation - Inventors: Gary A. Jones - Web page: https://patentgrep.com/patent/US5066004A ## CPC - A63B 23/03533: {With separate means driven by each limb, i.e. performing different movements} - A63B 21/4047: {Pivoting movement (weight pivoting A63B21/0615)} - A63B 23/03508: {For a single arm or leg, (A63B21/0726 takes precedence)} - A63B 23/0494: {primarily by articulating the knee joints (A63B23/0405, A63B23/0476 take precedence)} - A63B 21/0615: {pivoting about a fixed horizontal fulcrum} - A63B 2208/0233: in 90/90 position, like on a chair - 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 leg extension exercise machine includes a frame, a declined seat connected to the frame and two independently maneuverable levers pivotally connected to the frame in front of the seat, the levers being pivotal in vertical planes that diverge with respect to the front of the seat. Hubs at the lower, forward ends of the levers hold removable weights. Pads supported by the lower forward ends are adapted to be engaged by the fronts of the legs of a person and raised forwardly, upwardly and slightly outwardly to perform a leg extension maneuver while supported on the declined seat. The diverging vertical planes of movement accommodate the natural musculoskeletal leg movements of a person, thereby maximizing muscular benefit while minimizing joint stress. ## Claims ### Claim 1 A leg extension exercise machine comprising: a frame; a seat supported by the frame in alignment with a vertical midplane through the frame; a lever pivotally connected to the frame, a forward end of the lever adapted to hold a removable weight and adapted to be pivotally raised upwardly by the leg of a person supported on the seat, the level being pivotal through a vertical plane of movement which diverges outwardly from the vertical midplane with respect to a forward facing direction of the seat. ### Claim 2 (depends on 1) The leg extension exercise machine of claim 1 wherein the vertical plane of movement diverges from the vertical midplane at an angle of about 5.degree.. ### Claim 3 (depends on 1) The leg extension exercise machine of claim 1 wherein the lever is pivotally connected to the frame at a central pivot point and said forward end pivots forwardly from an initial angle of about 20.degree. from vertical. ### Claim 4 (depends on 1) The leg extension exercise machine of claim 1 and further comprising: means for selectively adjusting the initial angle of the lever, thereby to limit the range of pivotal motion of the lever. ### Claim 5 (depends on 1) The leg extension exercise machine of claim 1 wherein the lever has a rearward end that includes a counterweight. ### Claim 6 (depends on 1) The leg extension exercise machine of claim 1 and further comprising: a connector arm connected to the forward end of the lever and extending toward the midplane; and a pad supported on the connector arm and adapted to be acted upon by the leg of a person supported on the seat to pivotally raise the lever, the pad spaced from the vertical midplane to facilitate forward accessibility of the seat to the exerciser. ### Claim 7 (depends on 4) The leg extension exercise machine of claim 4 wherein the pad is spaced from the lever at a distance of about 8". ### Claim 8 (depends on 1) The leg extension exercise machine of claim 1 wherein the seat is declined with respect to the frame. ### Claim 9 (depends on 1) The leg extension exercise machine of claim 1 wherein the seat comprises back and bottom supports. ### Claim 10 (depends on 9) The leg extension exercise machine of claim 9 wherein said bottom support is declined about 20.degree. from horizontal. ### Claim 11 (depends on 9) The leg extension exercise machine of claim 9 wherein said back support is declined about 125.degree. from horizontal. ### Claim 12 (depends on 8) The leg extension exercise machine of claim 8 wherein the back and bottom supports have an angle of about 105.degree. therebetween. ### Claim 13 (depends on 9) The leg extension exercise machine of claim 9 and further comprising: a center leg supporting the back and bottom supports, and means for slidably adjusting the back support along the center leg. ### Claim 14 (depends on 13) The leg extension exercise machine of claim 13 wherein the back support further includes a pair of handles, thereby to facilitate slidable adjustment of the back support along the center leg. ### Claim 15 (depends on 13) The leg extension exercise machine of claim 13 wherein said bottom support has a centrally located cutout section to accommodate forward adjustment of the back support ### Claim 16 A leg extension exercise machine comprising: a frame; a declined seat supported by the frame along a vertical midplane, the seat including a bottom portion and a back portion; and a pair of levers pivotally connected to the frame, each lever having a forward end adapted to hold at least one removable weight and adapted to be pivotally raised upwardly by the leg of a person supported on the declined seat, the levers being pivotal in outer vertical planes that diverge outwardly from the vertical midplane with respect to the forward facing direction of the seat. ### Claim 17 (depends on 16) The leg extension machine of claim 16 and further comprising: a declined central leg supporting said bottom and said back portions of said seat; and means for adjusting said back portion along said central leg. ### Claim 18 (depends on 17) The leg extension machine of claim 17 wherein said bottom portion has a centrally located cutout section to accommodate forward adjustment of said back portion along said central leg. ### Claim 19 (depends on 16) The leg extension machine of claim 16 and further comprising: a pair of connector arms, each connector arm extending inwardly from a respective forward end of a lever and adapted to support a pad that is acted upon by an exerciser during a leg extension exercise, the pads and connector arms being spaced from the vertical midplane to facilitate forward access to the seat for the exerciser.