| 摘要 |
PURPOSE:To overlap the stroke of respective piston thus to shorten the overall length by providing interlocking means for selectively blocking or allowing intrusion of second piston rod into the containing hole of first piston. CONSTITUTION:Upon advance of the first piston 6 near to the end of advance, the first piston 6 will go over the tip section of a tubular member 18 thus to remove the tubular member 18 relatively from the containing hole 17 of the first piston 6. Under this state, second piston 7 will start to advance and upon projecting of the engaging click 21 of the second piston rod 19 from the tubular member 18, the engaging click 21 will enlarge the outer diameter larger than the inner diameter of the containing hole 17 through the resiliency of itself. Consequently, the second piston rod 19 will contact against the left endface of the first piston 6 thereby an object 16 to be pressed is subjected to large energizing force from the first and second pistons 6, 7 interlocked each other.
|
