Adjustable Ladder Leg Assembly for Uneven Surfaces
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Solution Overview
Problem
Conventional ladders lack an effective mechanism to adjust for wear and accommodate uneven flooring surfaces, leading to instability and potential movement issues when used on different floor conditions.
Innovation Solution
An adjustable leveling leg assembly for ladders, featuring a telescoping leg with a non-slip material and a user-actuatable bumper that allows for extension or retraction of the leg to accommodate wear and uneven surfaces, utilizing a connecting rod and cap assembly to adjust the leg's position and prevent rotation within an outer tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-length leg is used, then the ladder structure is simple, but the ladder cannot accommodate wear or uneven flooring surfaces
Solution Approach 1:
The leg assembly transitions from a fixed-length design to a dynamically adjustable design. The telescoping mechanism allows the leg length to be changed based on floor conditions or wear, enabling the ladder to adapt to various environments while maintaining a relatively simple overall structure.
Solution Approach 2:
The adjustable leg employs a telescoping design where one tube is nested within another. The outer tube houses the inner tube, allowing the leg to extend or retract as needed. This nested configuration provides adjustability without significantly increasing the space or complexity of the leg assembly.
2Reliability
If a non-adjustable leg is used, then the manufacturing cost is low, but the ladder becomes unstable on uneven surfaces
Solution Approach 1:
The leg assembly incorporates a telescoping mechanism with lockable positions that allow adjustment to compensate for uneven flooring surfaces. This dynamic adjustment capability ensures the ladder remains stable and secure on various floor conditions without requiring complex manufacturing processes.
3Duration of action of stationary object
If the leg length is fixed, then the structure is simple, but the leg cannot accommodate wear over time
Solution Approach 1:
The telescoping leg assembly allows the effective length to be adjusted as the leg material wears over time. By extending the leg to compensate for wear, the operational service life of the ladder is extended without requiring complete replacement of the leg assembly.
Solution Approach 2:
The adjustable design allows the functional length of the leg to be recovered or restored by extending it to compensate for wear. This effectively recovers the service life of the leg without requiring manufacturing of a new component.
4Stability of the object's composition
If a telescoping leg with rotation prevention is used, then the leg position is stable, but the mechanism becomes more complex
Solution Approach 1:
The connection between the inner and outer tubes employs asymmetric features such as flat surfaces or keys that prevent rotation while allowing linear extension and retraction. This asymmetric design provides rotational stability without requiring complex locking mechanisms, maintaining simplicity while ensuring stable leg positioning.
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 stable and adjustable ladder that can be adapted to various floor conditions, ensuring the ladder remains stationary and secure, reducing wear and tear on the legs while allowing for easy replacement of worn parts.
Implementation Method 1
The pusher assembly includes a threaded bore (e.g., at one end). The leg assembly also includes a connecting rod extending along an axis with a threaded first end that is in mesh with the threaded bore of the pusher assembly.
Data Source
AI summary
A rolling ladder includes opposing side members between which a plurality of treads are disposed at predetermined locations to define a ladder. The ladder further includes a support structure coupled to the ladder and including a front wheel support coupled to a plurality of rolling devices. A leg assembly has a user-adjustable length leg, allowing the user to extend or retract either leg to accommodate uneven or irregular floor surfaces. The leg length may also be adjusted to allow for wear in the material of the leg. A lock mechanism is responsive to user actuation and is configured to move the rolling devices from a rolling position to a retracted position, wherein the leg of the leg assembly contacts the floor to thereby inhibit movement of the ladder.