| 摘要 |
A collapsible elevated platform with integrated simultaneously erecting safety rails and handrails formed by two or more conjoined similar regular trapezoidal structures each comprising two supporting members uniformly inclined and equally distant from a common vertical axis and connected by pivoting means to a plurality of horizontal members each having additional pivoting means at the midpoint between the two supporting pivoting means and coincident with the central vertical axis of the regular trapezoid and on one or both sides of this central pivoting means is an additional member parallel to the inclined supporting member pivotally connected to all horizontal members so that when one horizontal member is displaced then all pivoting members move uniformly as a parallelogram arrangement the platform can then be collapsed or extended by one simultaneous operation with the handrails and safety rails collapsing and engaging by the same process and there being restricting means on the central pivoting means of the platform that when the collapsed closed structure is open the restricting means retains the platform as one continuous horizontal structural member. |
