Ladder Tray Locking Mechanism Single-Handed Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ladder tray locking mechanisms are cumbersome, requiring two hands to operate and can cause pinching, while also being space inefficient and not providing adequate rigidity, especially when in the open position.
Innovation Solution
A locking mechanism with dual sliding rods biased by springs for single-handed operation, eliminating the need for hinges and links, and incorporating metal strike plates for alignment and wear protection, with locking pins positioned above the pivot to enhance strength and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If links are used to provide locking and support for the tray, then the tray can be locked in the use position, but two hands are required to release the lock mechanism and there is potential for pinching
Solution Approach 1:
The patent removes the links from the mechanism entirely, extracting the problematic component that required two-handed operation and created pinching hazards. The locking function is achieved through a different mechanism using sliding rods and cam-actuated locking pins that can be operated with one hand.
Solution Approach 2:
The patent replaces the link-based mechanical system with a sliding rod and cam-actuated locking pin system. This substitution eliminates the need for two-handed operation while maintaining reliable locking, as the new mechanism uses cam surfaces to amplify the locking action during a single-handed squeezing motion.
2Strength
If links are used for locking mechanism, then the tray can be supported, but the mechanism takes up space beneath the tray
Solution Approach 1:
The patent extracts the links from the system entirely, eliminating the space they occupied beneath the tray. The support function is redistributed to the tray's structural ribs and the compact locking mechanism integrated into the handle assembly.
Solution Approach 2:
The patent moves the locking mechanism from a horizontal arrangement (links extending beneath the tray) to a vertical arrangement (locking pins moving vertically within the handle assembly). This dimensional change eliminates space occupation beneath the tray while maintaining locking functionality.
3Reliability
If traditional locking mechanism is used, then the tray can be attached to the ladder, but the operation is cumbersome and requires two hands
Solution Approach 1:
The patent implements a self-latching mechanism where the cam surfaces automatically engage the locking pins when the sliding rods are squeezed together. The springs provide automatic return to the locked position, making the system self-servicing and eliminating the need for two-handed manual manipulation.
Solution Approach 2:
The patent changes the operational parameter from requiring two separate hand movements to a single squeezing motion. The force applied by one hand simultaneously actuates both sliding rods, which through cam surfaces amplify this force into secure locking of both sides of the tray.
4Adaptability or versatility
If hinges are used to attach the tray, then the tray can be pivotally mounted, but the structure becomes more complex
Solution Approach 1:
The patent removes hinges from the mechanism entirely, extracting the source of structural complexity. The pivotal mounting function is replaced by a direct attachment system using the sliding rods and locking pins that secure the tray to the handle without requiring rotational joints.
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 provides a secure, rigid, and easy-to-operate ladder tray locking mechanism that reduces space usage and eliminates the need for separate storage and handling of the tray, enhancing user convenience and operational efficiency.
Implementation Method 1
springs to bias the locking pins in the locked position and the stored position of the tray
Data Source
AI summary
A locking mechanism for a ladder tray is disclosed. The locking mechanism includes two locking points on the frame or handle of the ladder while allowing single-handed operation.