Rotatable Trolley Handle for Compact Stacking
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Solution Overview
Problem
Existing manually movable trolleys face challenges in ergonomic handle design that compromises space efficiency during transport, as vertically aligned handles protrude above the trolley when not in use, making it difficult to stack them and requiring handles to be positioned in a way that prevents them from obstructing each other when pushed together.
Innovation Solution
A push handle system where the handle part is rotatably mounted about a transverse fastening axis, allowing it to pivot from a lying or downward position during transport to an upright position for use, which can be fixed in a coordinated sliding position, ensuring ergonomic alignment without protruding excessively and allowing for efficient stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vertically aligned handles are used for ergonomic operation, then ease of operation is improved, but the height of the trolley increases making stacking difficult
Solution Approach 1:
The handle is designed to be rotatable about a transverse fastening axis, allowing it to dynamically change orientation between an upright ergonomic position for use and a lying/downward transport position for compact stacking. This dynamic adjustment resolves the contradiction by enabling the handle to adapt its height based on operational needs.
Solution Approach 2:
Instead of only vertical adjustment, the handle is given rotational freedom about a transverse axis, adding a rotational dimension to the adjustment mechanism. This allows the handle to achieve a compact profile in the vertical dimension during transport while maintaining ergonomic vertical alignment during use.
2Ease of operation
If the handle is designed to protrude for ergonomic grasping, then ease of operation is improved, but the device complexity increases due to additional fastening mechanisms
Solution Approach 1:
The rotatable fastening mechanism serves multiple functions: it secures the handle in the upright position during use, enables rotation to the transport position, and allows secure fastening in both orientations. This multi-functionality reduces the need for separate mechanisms for each state, thereby limiting the increase in device complexity.
3Volume of stationary object
If the handle is made rotatable to reduce transport height, then volume of stationary object is improved, but reliability decreases due to additional moving parts
Solution Approach 1:
The fastening mechanism utilizes changes in the angular parameter of the handle orientation to achieve compact transport configuration. By controlling the rotation angle and providing fixed positions, the system achieves volume reduction while maintaining reliability through defined stable states that prevent unintended movement.
Data Source
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AI summary
The invention relates to a push handle for a transport cart that can be moved by hand, comprising a fastening element (2) for fastening the push handle to a handle support arm of the transport cart, wherein the fastening element (2) forms a fastening axis (S), which extends at least substantially transversely, for a handle part (3), and wherein the longitudinal axis of the handle part (3) is arranged at least substantially perpendicular to the fastening axis (S), wherein the handle part (3) is rotatably supported about the fastening axis (S) and wherein the handle part (3) can be fixed in at least one position.