Jack Stand Pawl Head for Obstruction-Free Height Adjustment
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Solution Overview
Problem
Existing jack stands for large workpieces face limitations in height adjustment due to handle collisions with nearby obstructions, requiring time-consuming repositioning and posing safety risks.
Innovation Solution
A jack stand design featuring a pawl mechanism that allows unidirectional height adjustment by engaging with a threaded nut's ridges, enabling full adjustment despite obstructions through a spring-tensioned pawl that rotates in one direction and remains still in the opposite direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional stop nuts with handles are used for height adjustment, then height adjustment capability is provided, but the handles collide with nearby obstructions when jack stands are placed in close proximity, limiting the adjustment range
Solution Approach 1:
The patent inverts the traditional stop nut design by eliminating the external handle and instead using a pawl mechanism that engages with ridges on the nut itself. This allows the nut to rotate in one direction for height adjustment while being blocked in the opposite direction, enabling full adjustment range without external handles that would collide with obstructions.
Solution Approach 2:
The pawl acts as an intermediary mechanism between the operator's input and the threaded nut. Instead of directly rotating the nut with a handle, the pawl engages with the ridges on the nut and translates limited rotational input into full height adjustment through its engagement mechanism, eliminating the need for handle rotation that would collide with nearby obstructions.
2Reliability
If jack stands are placed in close proximity to support workpiece ends, then proper support coverage is achieved, but the stop nut cannot rotate fully due to collision with nearby jack stands or obstacles, eliminating height adjustment ability
Solution Approach 1:
Instead of requiring full rotation of an external handle, the patent uses a pawl mechanism that engages with ridges on the threaded nut. The pawl allows the nut to rotate in one direction for height adjustment while being blocked in the opposite direction, enabling full adjustment range without external handles that would collide with obstructions.
Solution Approach 2:
The adjustment mechanism is segmented into distinct functional components: the pawl for directional control, the ridges on the nut for engagement, and the threaded rod for height adjustment. This segmentation allows each component to perform its specific function efficiently, with the pawl handling directional control and the threaded mechanism handling the actual height adjustment.
3Ease of operation
If traditional handles on stop nuts are used, then manual adjustment is enabled, but significant effort and time are required to readjust jack stand positions when full rotation is blocked, requiring additional equipment and worker time
Solution Approach 1:
The pawl acts as an intermediary mechanism that translates limited rotational input into full height adjustment. When the pawl engages with the ridges on the threaded nut, it allows the nut to rotate in one direction for height adjustment while being blocked in the opposite direction, enabling full adjustment range without requiring multiple readjustment operations.
Solution Approach 2:
The pawl mechanism is self-contained within the jack stand assembly, requiring no external handles or additional equipment for operation. The mechanism automatically provides directional control and full adjustment range through its internal ridge engagement system, eliminating the need for repositioning or additional equipment like forklifts.
4Ease of operation
If stop nuts with external handles are used, then height adjustment is possible, but the handles extend outward and collide with nearby obstructions, limiting the rotation range and essentially eliminating height adjustment
Solution Approach 1:
The patent extracts the external handle from the stop nut design, eliminating the geometric conflict with nearby obstructions. Instead of a handle extending outward, the adjustment function is achieved through a compact pawl mechanism that engages with ridges on the threaded nut, allowing full rotation without external protrusions.
Solution Approach 2:
The patent inverts the traditional stop nut design by eliminating the external handle and instead using a pawl mechanism that engages with ridges on the nut itself. This allows the nut to rotate in one direction for height adjustment while being blocked in the opposite direction, enabling full adjustment range without external handles that would collide with obstructions.
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
Enables full height adjustment of jack stands without full rotation, improving efficiency and safety by minimizing the need for repositioning and reducing worker risk.
Implementation Method 1
a pawl under spring tension that engages with a series of groves on the stop nut
Data Source
AI summary
A jack stand head comprising a threaded rod; a head affixed to the threaded rod; a threaded nut in operable communication with the threaded rod; and a central housing comprising a pawl, wherein the pawl engages the threaded nut so the threaded nut rotates when the housing is rotated in one direction.