Eccentric Pivot Restraint Bar Alignment
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Solution Overview
Problem
Existing restraint systems for industrial truck drivers face alignment issues due to production tolerances in vehicle pillars, leading to potential damage or restricted movement, especially when pillars twist during assembly.
Innovation Solution
Incorporating an eccentric mechanism that allows adjustable alignment of protective bars relative to pillars, with a self-locking feature to maintain stability and prevent accidental pivoting, along with a retaining means for additional security, and using curved surfaces for smooth pivoting without friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective bar is rigidly fixed to the pillar, then the connection is stable, but alignment errors occur due to pillar twisting and production tolerances
Solution Approach 1:
The protective bar is made adjustable through an eccentric mechanism that allows the bar to be repositioned angularly relative to the pillar. This dynamic adjustment capability enables compensation for pillar twisting and production tolerances, resolving the contradiction between rigid connection stability and alignment precision.
2Manufacturing precision
If the protective bar is made adjustable to compensate for pillar tolerances, then alignment precision improves, but the risk of accidental pivoting during accidents increases
Solution Approach 1:
The eccentric mechanism incorporates a self-locking feature where the eccentric geometry itself prevents unintended rotation. The asymmetric shape of the eccentric creates mechanical interference that blocks reverse motion, allowing the system to maintain its adjusted position without additional locking components while still permitting controlled adjustment.
3Device complexity
If a simple fixed connection is used, then the device complexity is low, but the system cannot accommodate pillar twisting and production tolerances
Solution Approach 1:
The eccentric mechanism changes the geometric parameters of the connection by introducing an offset center of rotation. This parameter change allows the protective bar to be positioned at different angular orientations relative to the pillar, providing adaptability to tolerance variations while maintaining a relatively simple mechanical structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures accurate alignment and high stability of protective bars, preventing damage and maintaining effective protection during vehicle maneuvers and accidents, while accommodating various vehicle geometries and tolerances.
Implementation Method 1
at least one eccentric is provided, the at least one protective bar being able to be aligned thereby relative to the at least one pillar to which said protective bar is fastened. Thus by rotating the at least one eccentric the angular position of the at least one protective bar may be adjusted
Implementation Method 2
The at least one eccentric has the particular advantage relative to other adjusting options that it acts in a self-locking manner. As a result, in the case of an accident it is prevented that the at least one protective bar is pivoted outwardly
Implementation Method 3
Additionally, the at least one protective bar is also lockable by at least one retaining means. The at least one retaining means is preferably in this case a screw but may also be implemented in a different manner.
Implementation Method 4
using curved surfaces for smooth pivoting without friction
Data Source
AI summary
A restraint system for a driver of a vehicle comprises at least one protective bar (6), being supported on at least one pillar (2). To achieve an alignment, at least one protective bar (6) is pivotably supported by at least one eccentric (8). The protective bar is lockable.