Vertical sit-up exerciser

Abstract

A vertical sit-up exerciser includes a hydraulic cylinder mounted at a post; a support unit including a sliding tube on the post, a bent bar having an upper end affixed to the sliding tube, a flat seat pivotably connected to a lower end of the bar, and a link having both ends pivotably connected to the seat and a lower end of the post; and a foot fastening unit including two pairs of linking members each having a lower end pivotably secured to the bar, two leg rests each pivotably secured to the lower ends of the linking members of the same pair, two foot engagement members each pivotably secured to upper ends of the linking members of the same pair, a connection member having either side pivotably secured to the upper ends of the linking members of the same pair, and a member for locking the foot engagement members.

1 . A vertical sit-up exerciser comprising: 
 a frame including a post and a base;    a lift mechanism mounted on the post and including a controller and a hydraulic cylinder mounted at the post and electrically connected to the controller;    a support unit including a sliding tube sleeved on the post, a bent bar having an upper end fixedly connected to the sliding tube, a flat seat pivotably connected to a lower end of the bar, and a link having both ends pivotably connected to the seat and a lower end of the post respectively; and    a foot fastening unit including two pairs of linking members, each linking member having a lower end pivotably secured to the bar, a pair of parallel leg rests each pivotably secured to the lower ends of the linking members of the same pair, a pair of parallel foot engagement members each pivotably secured to upper ends of the linking members of the same pair, a connection member having either side pivotably secured to the upper ends of the linking members of the same pair, and a locking member extended downward from the connection member;    wherein prior to beginning an operation of executing a sit-up using the exerciser, the back of a user is adapted to lie on the seat with the calves rested on the leg rests and tops of the feet secured to top ends of the foot engagement members by the locking member pressed on the foot engagement members such that operating the controller in a first half cycle of the sit-up will move the hydraulic cylinder upward along the post to lift the bar until being stopped with the seat pivoted counterclockwise from a horizontal position to a vertical position, the link pivoted clockwise a predetermined angle, and the arms of the user moved to dispose in a vertical position; and in a second half cycle of the sit-up will move the hydraulic cylinder downward along the post to lower the bar until being stopped with the seat pivoted clockwise from the vertical position to the horizontal position, the link pivoted counterclockwise the predetermined angle, and the arms of the user moved to dispose in a horizontal position.