Patent ID: 6371254
Filing Date: 2002-04-16
Classification: B66B,B66F

Abstract:
An arresting device for halting relative motion between a main cylinder and a second cylinder of a hydraulic elevator, wherein the second cylinder moves within the main cylinder, wherein the second cylinder has a perimeter and an external radius of curvature, said arresting device comprising:two lever arms, each of said two lever arms having an approximately semi-cylindrical braking surface and a pivot point, said approximately semi-cylindrical braking surface having an internal radius of curvature which is smaller than the external radius of curvature of the second cylinder, and said pivot point being offset from said braking surface, said lever arms having a first position wherein said lever arms are capable of being rotated away from the second cylinder with said braking surface out of contact with the perimeter of the second cylinder, and a second position wherein said lever arms are capable of pressing said braking surface against the perimeter of the second cylinder to generate a braking force.