Roller Assembly Height Adjustment Mechanism
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Solution Overview
Problem
Existing roller assemblies for heavy sliding doors face issues with wear and tear due to direct steel-on-steel contact in adjustment mechanisms, and struggle to allow the carriage assembly to freely pivot and move vertically without stressing intermediate components.
Innovation Solution
A roller assembly with an intermediate adjusting mechanism that includes a rotatable adjustment screw engaging with a fixed nut, allowing the carriage body to move lengthwise within slanted passages while freely pivoting, reducing wear and enabling self-leveling of the wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an adjustment screw is placed in direct contact with the carriage assembly, then height adjustment is enabled, but wear and tear increases due to steel on steel contact
Solution Approach 1:
An intermediate adjusting mechanism is introduced between the adjustment screw and the carriage assembly. This intermediate mechanism includes a threaded bore that engages with the adjustment screw, allowing the screw to rotate without directly contacting the carriage. The intermediate mechanism translates the rotational motion of the screw into linear motion that moves the carriage along slanted passages, thereby enabling height adjustment while eliminating direct steel-on-steel contact and reducing wear.
2Ease of operation
If an adjustment screw is in direct contact with the carriage assembly, then height adjustment is achieved, but the carriage assembly cannot freely pivot within the diagonal slot
Solution Approach 1:
The intermediate adjusting mechanism serves as a mediator that decouples the adjustment function from the pivoting function. The mechanism includes slanted passages that guide the carriage movement and allow it to pivot freely within the housing while still enabling height adjustment through the adjustment screw. The intermediate mechanism accommodates both movements without constraint.
3Reliability
If intermediate components are placed between the screw adjustment and the carriage assembly to reduce wear, then wear is reduced, but the carriage assembly cannot freely move up and down and pivot without stressing the intermediate components
Solution Approach 1:
The adjusting mechanism is segmented into distinct functional components: the adjustment screw for height control, the intermediate mechanism with threaded bore and slanted passages for motion translation, and the carriage assembly for free pivoting. This segmentation allows each component to perform its specific function without interfering with the others, enabling both wear reduction and free movement.
Solution Approach 2:
The intermediate adjusting mechanism is designed with dynamic characteristics that allow it to accommodate both linear movement (up and down) and rotational movement (pivoting) of the carriage assembly. The slanted passages provide guided movement paths that adapt to the carriage's motion requirements without creating stress concentrations or binding conditions.
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 reduces wear and tear, allows for smooth height adjustment, and ensures the carriage assembly can freely pivot and move vertically, maintaining even contact with the surface and distributing load effectively.
Implementation Method 1
an adjustment mechanism accessible from a first end of the housing, wherein movement of the adjustment mechanism causes the intermediate adjusting mechanism to move lengthwise with respect to the housing
Implementation Method 2
the carriage body being free to rotatably pivot about the pivot axis
Data Source
AI summary
A roller assembly comprising: a roller housing comprising first and second side walls and first and second end walls forming an enclosure; a carriage assembly comprising a carriage body and at least two carriage wheels rotatably attached to the carriage body, wherein the carriage assembly is located within the enclosure such that the at least two carriage wheels are arranged to protrude from the bottom of the enclosure during use; wherein the carriage body comprises a support portion and at least two concentric pivot points arranged to locate within slanted passages formed in the first and second side walls to allow the carriage body to rotatably pivot about the pivot points; an intermediate adjusting mechanism slidably engaged with the roller housing and arranged to move lengthwise within the enclosure, the intermediate adjusting mechanism comprising a first engagement surface located on an extending member, wherein the extending member extends in a direction substantially perpendicular to the lengthwise movement of the intermediate adjusting mechanism and the first engagement surface is arranged to engage with the support portion; and an adjustment mechanism that passes through an adjustment aperture formed in the first end wall, whereupon movement of the adjustment mechanism the intermediate adjusting mechanism is caused to move lengthwise within the enclosure, wherein the movement of the intermediate adjusting mechanism causes the carriage body to move along the slanted passage.