Three-Stage Parking Jack Automatic Lockbolt Safety
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Solution Overview
Problem
Extensible jacks, particularly three-stage jacks, face issues with the third tubular body unintentionally slipping or being extracted due to gravity or vibrations during use or transport, leading to safety concerns and potential loss.
Innovation Solution
An automatic safety device with a movable lockbolt is integrated, allowing sliding between the third and second tubular bodies in one position and preventing sliding in the other, automatically switching to the preventive position when a preselected distance is reached, ensuring the third tubular body remains securely attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the extension adjusting device allows tubes to be decoupled for easy adjustment, then the ease of operation is improved, but the reliability deteriorates as tubes may slip off or fall due to gravity
Solution Approach 1:
A safety device comprising a lockbolt acts as an intermediary element between the operator and the tube adjustment mechanism. The lockbolt automatically engages to prevent tube decoupling during normal operation, yet allows intentional decoupling when needed, thus mediating between safety and ease of adjustment requirements
Solution Approach 2:
The safety device is designed to automatically engage and disengage based on operational conditions without requiring continuous operator intervention. The system self-regulates tube retention, providing reliable protection against accidental decoupling while maintaining ease of operation when adjustment is intentionally required
2Adaptability or versatility
If the jack allows tube extraction for extension adjustment, then the adaptability is improved, but the loss of substance worsens as tubes may be lost during transport due to vibrations
Solution Approach 1:
The lockbolt serves as a protective intermediary that remains engaged during transport conditions, preventing tube extraction and potential loss while allowing intentional extraction when extension adjustment is required, thus mediating between adaptability and loss prevention
3Reliability
If a safety device is added to prevent tube slippage, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The safety function is extracted as a separate, dedicated device rather than being integrated into the existing tube adjustment mechanism. This modular approach improves reliability through specialized safety functionality while keeping the overall device complexity manageable through clear functional separation
Solution Approach 2:
The safety device operates automatically without requiring additional control mechanisms or complex actuation systems. The self-actuating nature of the lockbolt engagement and disengagement minimizes the added complexity while maximizing the reliability benefit
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
The solution enhances safety by preventing unintentional extraction of the third tubular body, maintaining stability during use and transport, and allowing easy adjustment of the jack's extension without direct operator intervention.
Implementation Method 1
an elastic member capable of rotating the lockbolt between the first position and the second position by inserting at least one portion of the second section into the second slot
Data Source
AI summary
A jack (1), which is extensible, comprising: a first tubular body (5), a second tubular body (30) slidably associated with the first tubular body (5) and movable along a predetermined longitudinal direction (A), a third tubular body (95) slidably associated with the second tubular body (30) and movable along the longitudinal direction (A), a base (115) for support associated with an end (105) of the third tubular body (95) distal from the second tubular body (30), characterized in that it comprises an automatic safety device (145) provided with a lockbolt (150) movable between a first position, wherein it allows relative sliding between the third tubular body (95) and the second tubular body (30), and a second position wherein it prevents the third tubular body (95) from sliding relative to the second tubular body (30).