Mast safety system
AssigneeSaudi Arabian Oil Company
InventorMohammed Ali Jathmi
Life of this patent
Estimating the term…
Abstract
A spool may include a drum rotatably supported on an axle shaft and flanges integrally formed with opposite ends of the drum. The drum has a continuous groove on the outer surface of the drum to guide the movement of the safety wireline. Both of the flanges may include an opening, internal threads circumscribing the opening, and a plurality of mechanical brakes. Each of the mechanical brakes may include a rotor rotatably supported on the axle shaft of the spool and a pawl arranged within the opening. The pawl is pivotally linked to the rotor such that when the rotation of the axle shaft is in a 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.
Claims19
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.
A spool comprising:
- a drum,
- an axle shaft rotatably supporting the drum,
- 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.
Dependencies are inferred from the claim text.