The invention discloses a gravity-controlled opening and closing lifting appliance and solves the problem a lifting appliance is high in cost and easy to damage when lifting a box-body heavy object. The gravity-controlled opening and closing lifting appliance is characterized in that four lifting arms having the same structure are arranged on a crane lifting beam respectively; pin shafts are connected with the lower ends of the lifting arms in a penetrating way; the front ends of the pin shafts are hinged to front-end swinging arms; the rear ends of the pin shaft (6) are hinged to rear-end swinging arms; lower pin shafts are connected between the lower ends of the front-end swinging arms and the lower ends of the rear-end swinging arms in a penetrating way; balancing weights are fixed on the lower pin shafts; coniform front shifting blocks are fixed to the front ends of the pin shafts; coniform rear shifting blocks are fixed to the rear ends of the lower pin shafts; and a lifted box body is arranged between the lower ends of two lifting arms. The invention provides the lifting appliance, which is free of manual operation and low in manufacturing cost, doesn't need power and is safe and reliable.
Gravity-controlled opening and closing lifting appliance
2015-12-16
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
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