Wheelchair Backrest Mounting with Self-Resetting Lock Peg
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Solution Overview
Problem
Existing wheelchair backrest mounting systems are complex and require manual resetting, posing difficulties for users in detachment and potential unlocking issues.
Innovation Solution
A self-locking and automatically resetting mounting system featuring a locking peg and peg receiver with a lock assembly that includes a movable locking member biased to the locked position, automatically resetting to the locked state upon peg retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manual resetting locking system is used, then the backrest can be securely attached, but the system complexity increases and user operation becomes difficult
Solution Approach 1:
The locking member automatically resets to the locked position after the peg is removed, without requiring manual intervention. The spring automatically pushes the locking member back into the locked position after unlocking, making the system self-resetting and reducing operational complexity
Solution Approach 2:
The locking member is pre-positioned in the locked position by the spring, ready to engage with the peg upon insertion. This preliminary positioning ensures immediate secure attachment without requiring additional user actions
2Reliability
If a manual resetting locking system is used, then the backrest can be securely attached, but the ease of operation deteriorates
Solution Approach 1:
The system performs the resetting action automatically through the spring mechanism, eliminating the need for users to manually reset the locking member after removal, thereby significantly improving ease of operation
Solution Approach 2:
The locking member transitions dynamically between locked and unlocked states based on peg presence. The spring provides continuous force to maintain the locked position, and the member automatically transitions when the peg is removed, making operation simpler
3Reliability
If a complex locking arrangement is used, then secure attachment is achieved, but the device complexity increases
Solution Approach 1:
The spring-powered automatic resetting mechanism eliminates the need for complex manual resetting procedures or additional control systems, maintaining consistent security while actually reducing overall system complexity
Solution Approach 2:
The locking and resetting functions are merged into a single integrated mechanism. The locking member and spring work together as one unit, combining security function with automatic resetting in a simple, unified 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
Facilitates easy detachment and secure attachment of the backrest to wheelchair posts with automatic locking, reducing user effort and ensuring consistent security.
Implementation Method 1
a lock biasing member that biases the locking member to the locked position
Implementation Method 2
The pin is biased to the extended position in which a distal end of the pin projects from the distal end of the locking peg
Data Source
AI summary
The invention provides a backrest mounting system to mount a backrest to a wheelchair post. The mounting system comprises a locking peg that is receivable within a peg receiver. The peg receiver comprises a lock assembly comprising a locking member adapted to engage with the locking peg in a locked position. The locking peg comprises a latch pin housing extending along at least a portion of a length of the peg and also comprises a latch pin within the latch pin housing. The latch pin is slidable between a retracted position and an extended position in which the latch pin engages with and holds the locking member in an unlocked position to allow the locking peg to be readily retracted from the peg receiver.