Patent ID: 7950695
Filing Date: 2011-05-31
Classification: B66F

Abstract:
1. A safety guard mechanism for a lifting device, comprising: a lifting device having a lifting member including a slidable linkset member, the lifting device having a frame; an elongated safety guard pivotally attached to the frame of the lifting device, the safety guard being pivotal between a retracted position adjacent the frame and an extended position proximate ground to prevent the lifting device from tipping over; a rotator body fixed to the safety guard, the rotator body having an elongated channel defined therein, the channel having a helical portion extending over a portion of the length of the rotator body; a slider arm attached to the slidable linkset member and constrained to slide linearly when the lifting member is raised, the slider arm having a free end; and a roller attached to the free end of the slider arm, the roller being rotatably disposed in the channel; wherein linear motion of the slider arm when the lifting member is raised pivots the safety guard to the extended position, and linear motion of the slider arm pivots the safety guard to the retracted position when the lifting member is lowered.