Patent ID: 8636112

Claim:
A safety lockout system ( 10 ) for releasably locking a mast guided working surface to a mast, wherein the mast guided working surface is translationally engaged with the mast, the safety lockout system ( 10 ) comprising: a) an inner rollcase ( 30 ) connected to the mast guided working surface such that the inner rollcase ( 30 ) translates with respect to the mast guided working surface; b) a lockout assembly ( 50 ) comprising: i) an upper connection plate ( 80 ) for connecting the lockout assembly ( 50 ) to the inner rollcase ( 30 ); ii) an overload mechanism ( 100 ) connected to the upper connection plate ( 80 ), the overload mechanism ( 100 ) including a lifting cradle ( 110 ); iii) a retractable dog ( 200 ) for engaging a portion of the mast, 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; iv) 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; and v) a dog arm ( 230 ) connected to the dog latch ( 220 ) by a dog latch-to-overload pin, wherein a portion of the dog latch-to-overload pin seats on the lifting cradle ( 110 ); and c) wherein upward translation of the inner rollcase ( 30 ) raises the upper connection plate ( 80 ) and overload mechanism ( 100 ) so that the lifting cradle ( 110 ) moves 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.