Abstract: A multi-purpose exercise machine is composed of a grip frame and a treading frame. The grip frame is of a U-shaped construction and is fastened at both ends thereof with the treading frame which can be folded to join with the grip frame so as to reduce the volume of the exercise machine for easy storage and shipping. The treading frame is provided with a plurality of rolling cylinders capable of affording an exerciser ther massaging exercise, the jogging exercise, and the walking exercise.

Abstract: An exercising apparatus including a folding frame having two rectangular frames pivoted in the middle, a rotary seat hinged to one rectangular frame, and two elastic ropes having each one end respectively fastened to the folding frame at the bottom and an opposite end coupled with a respective handle, and wherein the folding frame can be alternatively set into the operative position to support the rotary seat for permitting the player to sit on the rotary seat and pull the handles, or the collapsed position closely attached to the rotary seat at the bottom for permitting the player to stand on the rotary seat and pull the handles.

Abstract: Disclosed is a stepping exerciser for exercising the muscles of the legs. The stepping exerciser comprises two parallel pedals respectively pivoted to two opposite supports on a base frame and supported on the two opposite ends of a rocker arm for stepping the legs up and down alternatively, which rocker arm being balanced on a support at its center and caused to move in seesaw fashion, springs respectively supported between the base frame and the free end of either pedal, and two elastic cords respectively and bilaterally connected to the base frame at one end for pulling with the hands in keeping the body balanced as the user is alternatively stepping on the pedals.

Abstract: A connecting device comprising a inverted U-shaped holder plate mounted on a foot plate, which has a stub tube at the bottom inserted in either of a row of longitudinally aligned holes on the foot plate and two eyed lugs at the top to which a hydraulic cylinder is pivoted, a cam inserted in between two opposite vertical side walls of the holder plate and disposed below the foot plate, and a T-shaped key inserted through two polygonal through holes on the two opposite vertical side walls of the holder plate and a polygonal hole on the cam to connect the cam to the holder plate permitting the holder plate to be firmly retained to the foot plate, wherein rotating the T-shaped key in one direction causes the holder plate to be tightened to the foot plate; rotating the T-shaped key in the reverse direction causes the holder plate to be loosened from the foot plate.

Abstract: A weighing scale of the type comprising a scale is disclosed wherein the weighing scale is table for bearing the thing to be measured; a first hydraulic cylinder disposed below the scale table; a feeler transmitting the pressure applied at the scale table to the first hydraulic cylinder; a second hydraulic cylinder connected to the first hydraulic cylinder by a pipe and disposed at a level below the first hydraulic cylinder to bear the pressure transmitted through the feeler; a probe forced to make a linear displacement corresponding to the amount of the pressure transmitted from the first hydraulic cylinder to said second hydraulic cylinder; and an electronic inductor to detect the range of the linear displacement and convert it into a corresponding digital data for display.