US 11,851,953 B2
Mast safety system
Mohammed Ali Jathmi, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on May 5, 2020, as Appl. No. 16/867,031.
Prior Publication US 2021/0347616 A1, Nov. 11, 2021
Int. Cl. B66D 5/00 (2006.01); E21B 15/00 (2006.01); E04H 12/34 (2006.01); B66D 5/04 (2006.01); B66D 1/14 (2006.01)
CPC E21B 15/00 (2013.01) [B66D 5/04 (2013.01); E04H 12/345 (2013.01); B66D 1/14 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system comprising:
a spool comprising:
a drum rotatably supported on an axle shaft,
first and second flanges integrally formed with opposite ends of the drum, both having an opening and internal threads circumscribing the opening, and
a plurality of mechanical brakes, each mechanical brake comprising:
a rotor rotatably supported on the axle shaft, and
a pawl configured to engage with the internal threads circumscribing the opening,
where the rotor and the pawl are arranged within the opening, and
where the pawl is pivotally linked to the rotor such that when the rotation of the axle shaft is in a rotation direction and at a rotation speed that exceeds a threshold then the pawl is moved by centrifugal force and engages with the internal threads circumscribing the opening and does not permit the spool to rotate, and
a safety wireline having a first end and a second end, where the first end is anchored to the drum and the second end is configured to be coupled to a mast.