Patent ID: 9302543
Filing Date: 2016-04-05
CPC Classification: B60B

Claim Text:
1. A trolley for reciprocation upwardly and downwardly in a track having a generally rectangular hollow cavity with smooth inner walls, said track having a front side with a vertical slot, a rear side, a right side and a left side, said trolley comprising a generally elongated platform having a longer axis and having an attachment point for a lifting cable at an upper end, said trolley having a front face and a rear face with upper and lower trolley wheels mounted on wheel axles on the rear face transverse the longer axis, said upper and lower trolley wheels in rolling contact with the front and rear smooth inner walls of the track, upper and lower spacer wheels mounted on spacer axles perpendicular to a bottom face of the platform inboard of the wheel axles, said upper and lower spacer wheels in rolling contact with the right and left smooth inner walls of the track, said trolley reachable through the vertical slot in the track for attachment of a lifting cradle.