Patent ID: 11933277
Assignee: AVIA GEDALYA
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H  Y | IPC F  H

Claim 2:
3. The mechanical apparatus of claim 1, wherein the at least one sheave comprises:
at least one first sheave having a rotatable rounded groove around which the cable is passed, wherein the at least one first sheave is located such as to have a cable part that is proximal to the mast passed therethrough;
at least one second sheave having a rotatable rounded groove around which the cable is passed, the at least one second sheave being located such as to form a non-zero angle between the first part of the cable and a second part of the cable that is attached to the at least one moveable element at an end thereof; wherein the at least one movable element is held angularly to the first part of the cable, such that the gravitational force is applied over the at least one moveable element acting as a weight that can be lifted by upward movements of the at least one piston rigidly connected thereto and retract to a lowered open position of the at least one piston due to gravitational force applied thereover.