Inversion Chair Lock Assembly with Dual Pawl Safety
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Solution Overview
Problem
Existing inversion chairs lack a comfortable, secure, and easy-to-use securing mechanism, which is essential for user safety and effective spinal decompression.
Innovation Solution
A lock assembly comprising a ratchet plate, position lock pawl, and safety lock pawl, where the position lock pawl is pivotally connected to a second tube portion and selectively engages the ratchet plate through a slot, and the safety lock pawl engages the position lock pawl only when the user support is in the inverted position, preventing accidental disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple securing mechanism like seat belts or lap bars is used, then the device complexity is reduced, but the reliability and security of the securing mechanism deteriorates
Solution Approach 1:
The securing mechanism is divided into two independent pawls: a position lock pawl for normal operation and a safety lock pawl for security. This segmentation allows each component to perform its specific function effectively, with the position lock pawl providing easy adjustment and the safety lock pawl ensuring accidental release prevention, thereby resolving the contradiction between simplicity and reliability
Solution Approach 2:
The safety lock pawl is pre-configured to automatically engage when the user support reaches the inverted position, preventing accidental release before it can occur. This preliminary safety action ensures that the securing mechanism maintains reliability without requiring complex user intervention or additional controls
2Reliability
If a secure locking mechanism is implemented, then the reliability improves, but the ease of operation deteriorates
Solution Approach 1:
The safety lock function is extracted as a separate, passive component that automatically engages based on the user support position, rather than being integrated into the manual operation. This allows the user to easily adjust the position lock pawl without worrying about safety locking, maintaining ease of operation while ensuring reliability through the automatically activated safety mechanism
3Reliability
If the position lock pawl is always engaged, then the reliability is maximized, but the ease of operation deteriorates due to inability to adjust position
Solution Approach 1:
The securing mechanism transitions from a static always-locked state to a dynamic system where the position lock pawl can be easily disengaged and reengaged at different positions. The safety lock pawl provides automatic engagement at the inverted position, while the position lock pawl remains manually adjustable, allowing the system to adapt between security and adjustability based on operational needs
Data Source
AI summary
A lock assembly for use with an inversion apparatus includes a ratchet plate, a position lock pawl, and a safety lock pawl. The ratchet plate is operatively connected to a first tube portion and is accessible through a slot in a second tube portion of the inversion apparatus' securing assembly. The position lock pawl is pivotally connected to the second tube portion to selectively engage the ratchet plate through the slot. The safety lock pawl is pivotally connected to the second tube portion. The safety lock pawl does not engage the position lock pawl when the user support is in the loading position and is configured and arranged to pivot relative to the second tube portion as the user support moves from the loading position into the inverted position to engage the position lock pawl.