Ratcheting Jack Stand Locking for Easy Height Adjustment
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Solution Overview
Problem
Conventional jack stands face issues with safe and easy adjustment of load height due to cumbersome pin-based mechanisms and pawl disengagement problems, leading to potential slippage and accidents during load manipulation.
Innovation Solution
A ratcheting mechanism with a spring-loaded engagement element and a release button is integrated into the jack stand, allowing automatic engagement and disengagement of the central shaft, enabling easy height adjustment and secure locking without removable parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin insertion mechanism is used for height adjustment, then the jack stand can be locked at desired heights, but the adjustment process becomes cumbersome and time-consuming
Solution Approach 1:
The pawl automatically engages with the teeth on the central shaft without requiring manual intervention. The spring-loaded finger automatically inserts and secures the pawl in the recess, eliminating the need for users to manually insert pins or locking elements while maintaining secure locking at desired heights.
Solution Approach 2:
The patent replaces the manual pin insertion system with a spring-loaded mechanical system. The spring-loaded finger automatically positions and secures the pawl in the recess through elastic mechanical action, substituting the cumbersome manual pin handling with an automated spring-based mechanism.
2Adaptability or versatility
If a removable locking element is used, then the jack stand can be adjusted to different heights, but the locking element may be misplaced or lost
Solution Approach 1:
The patent merges the locking element (pawl) with the adjustment mechanism by integrating it into the central shaft structure. The pawl is permanently attached to the handle assembly and cannot be removed, eliminating the risk of misplacement while maintaining full height adjustability through the ratcheting mechanism.
Solution Approach 2:
The spring-loaded finger automatically secures the pawl in the recess without requiring user intervention to attach or secure the locking element. This self-securing mechanism ensures the locking element remains reliably in place throughout operation while allowing easy height changes.
3Ease of operation
If a pawl mechanism is used for automatic engagement, then height adjustment is easier, but the pawl may inadvertently disengage under load
Solution Approach 1:
The spring-loaded finger proactively prevents pawl disengagement by automatically inserting the pawl into the recess before load can cause inadvertent disengagement. The spring maintains constant pressure to keep the pawl securely engaged with the teeth, counteracting any forces that might cause disengagement under load.
Solution Approach 2:
The spring-loaded finger acts as an intermediary between the pawl and the central shaft. It mediates the engagement by automatically positioning the pawl in the recess and maintaining secure contact, preventing direct but potentially unstable pawl-to-teeth engagement that could lead to inadvertent disengagement.
4Reliability
If multiple components are used for the ratcheting mechanism, then the mechanism provides reliable locking, but the device complexity increases
Solution Approach 1:
The patent merges multiple components into integrated assemblies. The handle assembly combines the lever, pawl, and spring-loaded finger into a single unified component. The collar integrates the ratcheting mechanism with the central shaft structure. These mergers reduce the number of separate parts while maintaining reliable locking functionality.
Solution Approach 2:
The handle assembly serves multiple functions: it provides the lever for manual operation, houses the pawl for locking engagement, and contains the spring-loaded finger for automatic pawl insertion. This multi-functionality reduces overall device complexity by eliminating the need for separate components for each function.
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 ratcheting mechanism ensures safe and effortless adjustment of load height, preventing accidental disengagement and slippage, thus enhancing safety and stability during load manipulation.
Implementation Method 1
a spring-loaded pawl and external release button allows for automatic engagement and disengagement of the central shaft
Implementation Method 2
using a lever and spring-loaded finger to engage and disengage slots on the central shaft
Data Source
AI summary
Aspects of the disclosure include a jack stand. The stand may include one or more of: a housing, elongated support, engagement element, engagement element receiver, and a modulator. The housing may be adapted for receiving the elongated support. The elongated support may be configured for being associated with the housing, and may include one or more, e.g., a plurality of engagement element receivers. The plurality of receivers may be positioned sequentially along a length of the support and may be configured for receiving a portion an engagement element. The engagement element, therefore, may be adapted for removably engaging the engagement element receivers in sequential fashion, wherein the sequential engagement of the engagement element receivers by the engagement element causes the elongated support to move. The modulator may be associated to the engagement element and configured for modulating the engagement of the engagement element with the plurality of receivers.