Pantograph down stop for trolley

A pantograph assembly configured to transfer electrical power from an overhead conductor to a machine, the pantograph assembly comprising:

• a pantograph base detachably mounted to the machine;
• an articulated linkage assembly comprising:
• a thrust rod pivotally mounted to the pantograph base,
• a lower arm having a lower arm first end connected to the thrust rod, and
• an upper arm having an upper arm first end pivotally connected to a lower arm second end of the lower arm;
• a collector rail assembly operatively connected to an upper arm second end of the upper arm of the articulated linkage assembly and having a locking bar,
• wherein rotation of the thrust rod in a first thrust rod direction raises the articulated linkage assembly relative to the pantograph base and rotation of the thrust rod in a second thrust rod direction opposite the first thrust rod direction lowers the articulated linkage assembly relative to the pantograph base;
• a stop member mounted on and rotatable with the thrust rod, and having a lower limit surface that rotates into engagement with the pantograph base to prevent the articulated linkage assembly and the collector rail assembly from being lowered toward the pantograph base below a predetermined lower limit position;
• and
• a plurality of latch assemblies,
• each latch assembly, of the plurality of latch assemblies, being mounted on the pantograph base and operable to move between a latch locked position and a latch unlocked position,
• wherein the latch assembly is actuated to move to the latch locked position and engage the locking bar when the articulated linkage assembly is in the predetermined lower limit position,
• wherein the latch assembly when engaging the locking bar prevents the articulated linkage assembly and the collector rail assembly from moving upwardly from the predetermined lower limit position as the machine moves over a work surface, and
• the stop member and the plurality of latch assemblies reducing a downward movement of the pantograph assembly and reducing a possibility of the plurality of latch assemblies unlatching from the locking bar.

A pantograph assembly configured to transfer electrical power from an overhead conductor to a machine, the pantograph assembly comprising:

• a pantograph base detachably mounted to the machine;
• an articulated linkage assembly having a linkage assembly lower end operatively connected to the pantograph base and a linkage assembly upper end pivotally connected to the linkage assembly lower end;
• a collector rail assembly operatively connected to the linkage assembly upper end,
• wherein the collector rail assembly comprises a locking bar;
• a stop member operatively connected to the articulated linkage assembly and engaging the pantograph base to prevent the articulated linkage assembly and the collector rail assembly from being lowered toward the pantograph base below a predetermined lower limit position;
• and
• a plurality of latch assemblies, each of the plurality of latch assemblies comprising:
• a latch member pivotally mounted on the pantograph base, and
• a latch actuator operatively connected to the latch member and operable to move the latch member between a latch locked position and a latch unlocked position,
• the latch member preventing the articulated linkage assembly and the collector rail assembly from moving upwardly from the predetermined lower limit position as the machine moves over a work surface, and
• the stop member and the plurality of latch assemblies reducing a downward movement of the pantograph assembly and reducing a possibility of the plurality of latch assemblies unlatching from the locking bar.