A lifting device for poles, such as a mast for a sailing ship, a Christmas tree, a pole for supporting wires or the like, are either raised to a vertical position or laid down to a horizontal position, i.e. the lifting device may be used both when a pole is brought from a horizontal to a vertical position and when a pole is brought from a vertical to a horizontal position.
LIFTING DEVICE FOR POSITIONING AND ORIENTING A POLE
2022-03-10
Patent
Elektronische Ressource
Englisch