Patent ID: 8851236

Claim:
A lockout assembly ( 50 ) for releasably locking a mast guided working surface to a mast, comprising: a) an overload mechanism ( 100 ) slidably connected to a housing ( 90 ), the overload mechanism ( 100 ) having a lifting cradle ( 110 ) and an overload spring ( 120 ) mounted about an overload spring post ( 122 ), wherein the overload spring post ( 122 ) is connected to an upper connection plate ( 80 ); b) a retractable dog ( 200 ) for engaging a portion of the mast, the retractable dog ( 200 ) connected to the housing ( 90 ) and the retractable dog ( 200 ) including a dog engagement pin ( 210 ), wherein the retractable dog ( 200 ) is movable between an engaged position and a disengaged position; c) a dog latch ( 220 ) releasably engaged with the dog engagement pin ( 210 ), wherein the dog latch ( 220 ) is movable between a latched position and an unlatched position; d) a dog arm ( 230 ) connected to the housing ( 90 ), and wherein the dog arm ( 230 ) is connected to the dog latch ( 220 ) by a dog latch-to-overload pin and a portion of the dog latch-to-overload pin seats on the lifting cradle ( 110 ); and e) wherein upward translation of the overload mechanism ( 100 ) with respect to the housing ( 90 ) causes the lifting cradle ( 110 ) to move the dog latch-to-overload pin in an upward and rearward direction causing the dog latch ( 220 ) to exert a force on the dog engagement pin ( 210 ) such that the retractable dog ( 200 ) moves from the engaged position to the disengaged position.