초록 ▼

An ambulatory power lift including a base and a movable lifting platform connected by a scissor lever assembly. Hydraulic power cylinders expand said scissor assembly in a manner which applies a substantially vertical lifting force to said platform. A modular power unit directs hydraulic fluid to sa

An ambulatory power lift including a base and a movable lifting platform connected by a scissor lever assembly. Hydraulic power cylinders expand said scissor assembly in a manner which applies a substantially vertical lifting force to said platform. A modular power unit directs hydraulic fluid to said cylinders and allows the remote control of the lifting operation. A retractable bridge assembly on one end of the platform automatically raises as said lift is lowered, and a retractable wheel assembly allows the lift to be selectively transported in a lowered condition. A retractable guardrail closes at least one end of the lift platform. Safety means are also provided to prevent tampering with said power unit and to prevent entrapment between the platform and base.

대표청구항 ▼

In an ambulatory dock lift having a base and a loading platform which can be raised and lowered with respect to said base, the improvement comprising a retractable throw-over bridge system for joining the loading platform to an adjacent loading surface such as a truck bed or the like, said bridge sy

In an ambulatory dock lift having a base and a loading platform which can be raised and lowered with respect to said base, the improvement comprising a retractable throw-over bridge system for joining the loading platform to an adjacent loading surface such as a truck bed or the like, said bridge system comprising: an elongate bridge member of a predetermined weight joined at a pivot point to one end of said loading platform and being pivotal between an upright retracted position through an intermediate position above the horizontal and lowered position below horizontal, and having a selected length so that said bridge member will span a selected space between the loading platform and an adjacent loading surface; a bridge retractor assembly joining siad bridge member to said platform, said retractor assembly including biasing means for applying a lifting force to said bridge member at a selected lifting point to bias said bridge member upwardly toward said upright retracted position; said lifting force of said biasing means being of a value in relation to the weight of said bridge member such that said lifting force is initially insufficient to pivot said bridge member upwardly from said lowered position and becomes sufficient to pivot said bridge member automatically to said retracted position when, through external forces, said bridge member is pivoted upwardly and reaches said intermediate position.