Patent ID: 9717934
Date: 2017-08-01
CPC Classifications: A62B,E04G,E04H,F16M

Claim:
1. A fall protection apparatus comprising: a telescopic mast comprising: a plurality of tubular mast sections including an outer section, a first inner section slidable longitudinally within the outer section and a second inner section slidable longitudinally within the first inner section; each of the sections having a rectangular cross-section so that each has first, second, third and fourth faces parallel to and immediately adjacent respective first, second, third and fourth faces of each of the other sections; the sections being slidable from a retracted position where the first and second inner sections are at least partly within the outer section to an extended position; a drive arrangement for causing said sliding movement of the first inner section longitudinally of the outer section to the extended position thereof; and an extension cable and pulley arrangement for causing the movement of the first inner section to the extended position to be communicated to the second inner section to cause said sliding movement of the second inner section longitudinally of the first inner section to the extended position thereof; the extension cable and pulley arrangement including a first and a second extension pulley each mounted on the first inner section and an extension cable arrangement connected at one end to the outer section and at an opposed end to the second inner section so as to pull the second inner section to the extended position as the first inner section moves out of the outer section; wherein said drive arrangement is arranged also to also cause said sliding movement of the first inner section longitudinally of the outer section to the retracted position thereof, said drive arrangement including a retraction cable and pulley arrangement for causing the movement of the first inner section to the retracted position to be communicated to the second inner section to cause said sliding movement of the second inner section longitudinally of the first inner section to the retracted position thereof; said retraction cable and pulley arrangement including a first and a second retraction pulley each mounted on the first inner section and a retraction cable arrangement connected at one end to the outer section and at an opposed end to the second inner section so as to pull the second inner section to the retracted position as the first inner section moves into the outer section.