Patent ID: 6089634
Filing Date: 2000-07-18
Classification: B66C

Abstract:
A safety lifting device for detachable interconnection between a lifting means and a lifting lug rigidly attached to a load to be lifted, said safety lifting device comprising:a body member extending downwardly between an upper end and a lower end thereof so as to define a longitudinal axis therebetween, said body member having a throughpassage adjacent its lower end, said throughpassage extending between first and second lateral sides of the body member so as to define an axis of said throughpassage substantially transverse to said longitudinal axis;a shackle means for rigidly connecting the body member to said lifting means;a lift pin member having a head portion of larger cross-sectional dimension than said throughpassage and a shaft portion extending from said head portion along a major axis of the lift pin member to a free end,said lift pin member having a transverse bore axially extending through said shaft portion adjacent the free end in a direction substantially normal to the major axis of the lift pin member, said shaft portion being slidably insertable into said throughpassage in a first axial direction to a fully inserted position, at which fully inserted position a terminal section of the shaft portion containing the free end and the transverse bore projects from the first lateral side of the body member with the transverse bore being substantially vertically oriented, the head portion projects from the second lateral side of the body member, and an intermediate section of the shaft portion extending between the terminal section and the head portion is positioned with respect to the body member so as to provide for contacting, lifting engagement with said lifting lug;a stop pin member having a head portion of larger cross-sectional dimension than said transverse bore and a shaft portion extending from said head portion along a major axis of the stop pin member, said shaft portion being slidably insertable with the assistance of gravity into the transverse bore in a first pin direction to a locked position when the shaft portion of the lift pin member is at the fully inserted portion, at which locked position the head portion of the stop pin member provides interfering contact with the first lateral side of the body member, so as to prevent pulling, sliding withdrawal of the shaft portion of the lift pin member from the throughpassage in a second axial direction opposed to said first axial direction;a lift pin pull line having a proximal end connected to the head portion of the lift pin member and a distal end operatively positioned below the body member, for pulling, sliding withdrawal of the shaft portion of the lift pin member from within the throughpassage in said second axial direction;a stop pin pull line having a proximal end connected to the head portion of the stop pin member and a distal end operatively positioned below the body member, for pulling, sliding withdrawal of the shaft portion of the stop pin member from within the transverse bore in a second pin direction opposed to said first pin direction; anda first guide means for directing tensile force operatively applied upon the stop pin pull line at its distal end to the head portion of the stop pin member in substantially the second pin direction, said first guide means being operatively mounted on the body member.