Patent ID: 6398187
Filing Date: 2002-06-04
Classification: B66F

Abstract:
A jack comprising:a frame; a base including a first end pivotally mounted to the frame and a second end, the base further including an engaging portion; an elevating member securely attached to the second end of the base; a cylinder means including an end pivotally connected to the frame, the cylinder means including a cylinder and a piston rod having a first end slidably received in the cylinder and a second end beyond the cylinder, the second end of the piston rod being connected to the base to move therewith; and an operative rod releasably engageable with one of the engaging portion of the base and the cylinder means; wherein when an end of the operative rod is engaged with the engaging portion of the base, the elevating member is quickly elevated when another end of the operative rod is applied with a force; and wherein when the operative rod is engaged with the cylinder means, the elevating member is elevated under manual operation on the operative rod.