Telescopic Ladder Locking Mechanism with Extraction Linkage
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Solution Overview
Problem
Conventional telescopic devices for ladders face difficulties in adjusting individual telescoping bodies on uneven surfaces, require excessive effort for locking and unlocking, and often compromise on the strength of the insertion element due to internal locking mechanisms and operating member placement.
Innovation Solution
A telescopic device with a pair of outer casings, insertion bodies, and a locking mechanism that allows simultaneous or individual unlocking of locking units using an operating rod and handle, featuring a linkage system to prevent rocking disengagement and enable easy telescoping adjustments, with the insertion body constructed as a tubular body for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locking mechanism is disposed inside the insertion element and a long operating member is disposed inside the insertion element to enable remote operation, then the locking mechanism can be operated from a remote location, but the insertion element cannot be constructed as a tubular element and requires excessive effort for operation
Solution Approach 1:
The locking mechanism and operating member are extracted from the insertion element and disposed in the outer casing instead. This allows the insertion element to be constructed as a tubular element with improved strength while reducing operational effort, as the locking mechanism is now accessible from the exterior of the outer casing.
Solution Approach 2:
The operating member is designed as a short, simple lever that can be easily manipulated by hand. This short operating member provides sufficient leverage for locking and unlocking operations without requiring excessive force, replacing the need for a long operating member that would extend deep into the insertion element.
2Ease of operation
If the locking mechanism is disposed inside the insertion element to enable remote operation, then the locking mechanism can be operated from a remote location, but the insertion element strength is compromised and requires thick construction or reinforcement members
Solution Approach 1:
The locking mechanism is extracted from the insertion element and relocated to the outer casing. This extraction allows the insertion element to be constructed as a simple, strong tubular element without internal locking components, significantly improving its strength-to-weight ratio and structural integrity.
3Reliability
If the handle is supported for movement perpendicular to rocking direction and the latching portion is fitted in the latching hole to prevent rocking motion, then the locking member is restrained against rocking disengagement, but the locking mechanism requires complex movement control
Solution Approach 1:
The disengagement preventing portion is designed to proactively prevent accidental disengagement by physically blocking the latching portion from moving out of the latching hole. This preliminary anti-action ensures reliable locking without requiring complex control systems, as the prevention is built into the mechanical structure itself.
Data Source
AI summary
A telescopic device achieves both simultaneous unlocking of paired locking units and easy unlocking of one locking unit, and includes: outer casings; insertion bodies; vertically-arranged rung members; a locking mechanism; and an operating mechanism having an operating member. The locking mechanism comprises retention portion of the insertion body and locking member supported on the outer casing for engagement with and disengagement from the retention portion by separating-approaching motion. The locking member is interlocked to operating member extending from the locking mechanism toward the upper rung member. The operating mechanism has an operating rod for coupling the paired operating members for concurrent movements in unlocking direction. Each end of the operating rod and one operating member are fitted together so that, when manipulating one end of the operating rod in unlocking direction, the operating rod is inclined for movement of one operating member in unlocking direction.