Pneumatic jack with downward pressing bladder

An apparatus comprising:

• a jack body;
• a lifting arm pivotally coupled to the jack body;
• a lower mount pivotally coupled to a proximal end of the lifting arm;
• an upper mount attached to the jack body;
• a bladder disposed between the lower mount and the upper mount;
• a plurality of wheels attached to the jack body, at least one of the plurality of wheels comprising a caster;
• and
• a valve adapted to receive a compressed gas and to control inflation and deflation of the bladder with the compressed gas;
• wherein, with the plurality of wheels resting on a horizontal surface:
• the upper mount is positioned higher than the lower mount;
• inflating the bladder applies downward pressure on the lower mount, causing the lower mount to move downward;
• deflating the bladder while it is at least partially inflated removes the downward pressure on the lower mount, allowing the lower mount to move upward;
• downward movement of the lower mount lowers the proximal end of the lifting arm and raises a distal end of the lifting arm;
• and
• upward movement of the lower mount raises the proximal end of the lifting arm and lowers the distal end of the lifting arm.