07070545 is referenced by 43 patents and cites 672 patents.

An exercise machine composed of a frame, a first four bar linkage system, a second four bar linkage system, and a means for transferring an incident force from the legs of a user is disclosed. The first four bar linkage system is operably mounted on the frame and operably connects the transferring means to the frame to allow for back and forth movement of the transferring means along a path of travel about an instantaneously changing axis of rotation. The second four bar linkage system operably engages the first four bar linkage system. Either or both of the first four bar linkage system and the second four bar linkage system are operably connected to a resistance means, whereby the second four bar linkage system operates in conjunction with the first four bar linkage system and the resistance means to create a mechanical disadvantage to the user.

Title
Leg press and abdominal crunch exercise machine
Application Number
10/211409
Publication Number
7070545 (B2)
Application Date
August 1, 2002
Publication Date
July 4, 2006
Inventor
Gregory M Webb
Independence
VA, US
Andrew P Lull
Boulder
CO, US
Agent
Dorsey & Whitney
Assignee
Nautilus
WA, US
IPC
A63B 21/062
A63B 21/06
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