Retractable Access Platform Bridge and Cage Mechanism
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Solution Overview
Problem
Existing access platforms fail to provide safe, longitudinally adjustable, and retractable access to adjacent thoroughfares without intruding into clearance envelopes, posing safety and operational challenges.
Innovation Solution
A retractable access platform system comprising a raised walkway with a movable tracking platform, a pivoting turret, a rotatable bridge, and a horizontally extending cage that can be raised to clear thoroughfare clearance envelopes, ensuring safe access and non-intrusive retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access platform is made retractable to avoid intruding into clearance envelopes, then safety is improved, but device complexity increases
Solution Approach 1:
The access platform employs dynamic components including a movable tracking platform that can travel along the raised walkway, a rotatable turret that can pivot 180 degrees, and a vertically rotatable bridge that can move between horizontal and vertical positions. These dynamic elements enable the platform to adjust its position and orientation to avoid intruding into clearance envelopes while maintaining safety.
Solution Approach 2:
The access platform is divided into separate functional segments: the raised walkway structure, the movable tracking platform, the rotatable turret, the vertically rotatable bridge, and the horizontally rotatable cage. This segmentation allows each component to be optimized independently and facilitates the retractable operation needed to clear clearance envelopes.
2Adaptability or versatility
If the cage is raised vertically to clear clearance envelopes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The bridge is designed with vertical rotatability, allowing it to pivot between a horizontal position (for access) and a vertical position (for retraction). This dynamic capability enables the cage to adapt to different operational requirements while clearing clearance envelopes without permanent structural modification.
Solution Approach 2:
The cage clearance is achieved by moving the bridge and cage assembly from the horizontal plane to the vertical dimension. By rotating the bridge vertically, the cage is lifted out of the horizontal clearance envelope, providing adaptability while maintaining a compact retracted profile.
3Adaptability or versatility
If the tracking platform is made movable along the entire length of the raised walkway, then adaptability is improved, but device complexity increases
Solution Approach 1:
The tracking platform is designed to be movable along the entire length of the raised walkway, enabling it to adapt to different positions and orientations relative to the thoroughfares. This dynamic positioning capability enhances versatility while requiring sophisticated movement mechanisms.
Data Source
AI summary
An apparatus for providing access to vehicles and containers on a pair of railways or thoroughfares. The apparatus is comprised of a raised walkway between the pair of thoroughfares having a tracking platform movable thereon. Pivotally attached to and carried by the tracking platform is a turret. Carried on the turret and hinged thereto is a bridge that is rotatable in a vertical plane. At the end of the bridge is a cage pivotally attached to the bridge so that the cage remains horizontal when the bridge is rotated vertically on the turret. The bridge and cage are dimensioned so that, when the turret is rotated such that the bridge is directed between and parallel to the thoroughfares and the bridge and cage are raised, the apparatus is entirely out of the clearance envelopes of the thoroughfares.