Descending stroke adjustable device for a lifting tool

A descending stroke adjustable device for a lifting tool, the lifting tool comprising:

• a frame, a trigger, a support rod, a descending stopping spring, a lifting piece, and a lifting reset spring, the support rod being axially arranged in a penetrating manner in the frame;
• a lower end of the support rod being located out of the frame and a support leg being arranged at the lower end of the support rod;
• a lifting leg being arranged at a lower end of the frame;
• and
• a separation distance between the lifting leg and the support leg being adjusted by moving the support rod,
• the support rod, being located inside the frame, being equipped with a lifting piece which is capable of driving said support rod to move downwards;
• the lifting reset spring being arranged between the lifting piece and the frame;
• the lifting piece being connected to a trigger driving the lifting piece to incline downwards;
• and
• the trigger being hinged to the frame and forming an included angle with a grip on one side of an upper part of the frame, wherein the descending stroke adjustable device is mounted out of an upper end of the frame, the descending stroke adjustable device comprises a height descending device and a stroke adjusting device, the height descending device is penetrated by the support rod and a descending stopping spring is compressively mounted between the height descending device and an upper end surface of the frame,
• wherein the height descending device and the support rod keep a descending stopping inclination angle;
• and
• wherein the stroke adjusting device achieves an adjustable step-down stroke by controlling an up-down moving range when the height descending device is pressed.