Ladder Foot Mechanism With Cam Locking for Stable Positioning
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Solution Overview
Problem
Conventional ladders, particularly extension ladders, face challenges in maintaining their feet in a desired position during transportation and setup, leading to potential safety hazards and damage due to inadvertent pivoting.
Innovation Solution
A ladder leg design featuring a foot mechanism with a housing member, a pivotal foot, and biasing members that maintain the foot in specific positions through a cam groove and pin system, ensuring the foot remains in a chosen configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional pivoting feet are used on extension ladders, then the foot can be positioned in either a standard position or a pick position, but the foot inadvertently pivots between positions making it difficult to maintain the desired position
Solution Approach 1:
The foot mechanism uses a dynamic spring-loaded system that allows the foot to pivot between positions when force is applied, but automatically returns to and maintains the desired position through spring biasing. The cam groove and follower pin create a dynamic locking mechanism that holds the foot firmly in either the standard or pick position once positioned.
Solution Approach 2:
The spring-loaded follower provides continuous feedback to the foot's position through the cam groove mechanism. When the foot pivots, the follower moves along the cam groove, and the spring force provides immediate resistance and feedback, alerting the user to position changes and automatically correcting unintended pivoting.
2Adaptability or versatility
If the foot is allowed to pivot freely between positions, then the user can switch between standard and pick positions, but this creates safety hazards and potential damage to supporting surfaces
Solution Approach 1:
The spring-loaded mechanism applies preliminary counteracting force to prevent inadvertent pivoting before it occurs. The biased follower continuously exerts force on the cam groove to maintain the foot in its current position, creating resistance against any unintended movement that could lead to safety hazards or surface damage.
3Reliability
If a fixed foot design is used, then the foot maintains a consistent position, but the ladder cannot adapt to different ground conditions requiring pick position engagement
Solution Approach 1:
The foot mechanism transforms a fixed design into a dynamic system that can adapt to different ground conditions. The spring-loaded follower allows the foot to pivot to the pick position when needed for soft or uneven ground, while the cam groove mechanism ensures the foot returns to and maintains the standard position on hard surfaces, providing both consistency and adaptability.
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 design stabilizes the ladder feet in desired positions, enhancing safety and preventing damage to surfaces by ensuring they do not inadvertently pivot, thus improving ladder functionality and stability.
Implementation Method 1
At least one biasing member is configured to maintain a biasing force between the housing member and the foot at each of the first position and the second position
Data Source
AI summary
Various embodiments of ladders, ladder legs, ladder feet, foot mechanisms for ladders, and related methods are provided herein. In one embodiment, a foot is pivotal relative to a leg or rail of the ladder between a first position and at least a second position. A biasing force is applied to the foot to maintain the foot in either of the user-selected positions until a force is applied to pivot the foot to another position. In one embodiment, the foot mechanism maintaining the foot at a desired position may include a pair of pins that couple the foot to another component (e.g., a housing member, an insert member or a rail of the ladder). At least one of the two pins may be displaceable relative to the other pin during pivoting of the foot.