Adaptable Cart Lifter Lock Release Mechanism
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Solution Overview
Problem
Existing refuse container lifters on collection vehicles face challenges when mounted on vertical surfaces, as they cannot retract to a recessed position in the lowered state and may get stuck, and lack adaptability to engage obstacles, limiting their operational flexibility.
Innovation Solution
A lock/release mechanism is introduced that prevents relative movement between upper and lower hooks in the inverted position but allows it in the retracted position, enabling the lifter to pivot freely around obstacles and adapt to vertical surfaces by using a pivotably connected locking bar and biased mechanism that engages and disengages as the lifter moves between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lifter is mounted on vertical surfaces, then the mounting flexibility is improved, but the lifter cannot retract to a recessed position and may get stuck
Solution Approach 1:
The patent applies the dynamics principle by making the connection between the lift arm and second actuator arm movable rather than fixed. The pivotable connection allows the assembly to change its configuration dynamically - locked during inversion for stability, and movable during retraction for adaptability. This resolves the contradiction by enabling the system to exhibit different mechanical characteristics (rigid vs. flexible) depending on the operational phase.
2Stability of the object's composition
If the lifter structure is fixed and rigid, then the engagement stability is improved, but the lifter cannot adapt to obstacles or pivot freely
Solution Approach 1:
The patent implements dynamics by introducing a pivotable connection that transitions between locked and movable states. During container engagement and inversion, the lock prevents relative movement ensuring stable engagement. During retraction or obstacle encounter, the pivotable connection allows the second actuator arm to move freely relative to the lift arm, enabling adaptation to various mounting surfaces and obstacles.
3Reliability
If the lock mechanism prevents relative movement, then the engagement reliability is improved, but the lifter loses operational flexibility
Solution Approach 1:
The patent resolves this contradiction by making the lock mechanism dynamic rather than static. The lock is engaged during the inversion operation to ensure reliable container handling, but can be released or bypassed during retraction to allow operational flexibility. The pivotable connection serves as a mechanical fuse that protects the system while allowing necessary movements for adaptability.
Data Source
AI summary
A refuse collection cart lifter is provided with a lock/release mechanism that prevents relative movement between the upper and lower hooks when the lifter is in the inverted position, but permits such relative movement when released so as to permit the lifter to have a an adaptable or “breakaway” feature This allows the lifter to be mounted on vertical surfaces that may prevent the lifter from retracting to a recessed position when in the lowered or retracted position, but still permit the first actuator arms supporting the lower hook to pivot freely with respect to the lift arms should an obstacle be engaged.