Drawer Slide Positioning Mechanism for Ball-Bearing Tolerance
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Solution Overview
Problem
Existing slide assemblies face challenges with assembly tolerance, load restrictions, and compatibility with soft-closing or push-open designs, particularly due to high precision requirements that can lead to awkward operation when tolerance ranges are exceeded.
Innovation Solution
A slide assembly featuring a support member with a resilient arm and dowel system that compensates for installation tolerance by allowing limited movement, combined with ball bearing retainers for smooth sliding, and a connection frame with a slot and latch for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ball bearings are used as sliding media to bear high loads, then load capacity is improved, but assembly tolerance requirement becomes more stringent leading to awkward operation when tolerance is exceeded
Solution Approach 1:
The patent changes the physical state of the positioning mechanism from rigid to elastic by using an elastic arm instead of a rigid positioning structure. This allows the system to adapt to assembly tolerance variations while maintaining ball bearing load capacity, resolving the contradiction between high load capacity and stringent tolerance requirements
Solution Approach 2:
The positioning device transitions from a static rigid structure to a dynamic elastic structure that can deform within elastic limits. The elastic arm bends to accommodate assembly misalignments, allowing the ball bearings to function properly even when assembly tolerance is exceeded, thus maintaining both high load capacity and operational smoothness
2Ease of operation
If high precision ball bearings are used, then operational smoothness is improved, but the drawer and cabinet squeeze the ball bearings when assembly tolerance exceeds permissible range
Solution Approach 1:
The patent changes the rigidity parameter of the positioning structure by introducing an elastic arm that can deform. This allows the system to absorb assembly tolerance errors without transmitting squeezing forces to the ball bearings, maintaining operational smoothness while being less sensitive to manufacturing precision variations
Solution Approach 2:
The elastic arm acts as a pre-designed cushioning element that absorbs assembly tolerance errors before they can reach the ball bearings. This beforehand cushioning prevents the squeezing effect that would otherwise occur when assembly tolerance exceeds permissible ranges, protecting the operational smoothness
3Manufacturing precision
If rollers are used as sliding media to allow larger assembly tolerance, then manufacturing cost is reduced, but load capacity is restricted
Solution Approach 1:
The patent merges the advantages of both rollers and ball bearings by using an elastic positioning device with ball bearings. The elastic arm provides the assembly tolerance accommodation characteristic of roller systems, while the ball bearings provide the high load capacity characteristic of precision systems, combining both benefits into a single solution
Solution Approach 2:
The elastic arm serves as an intermediary between the rigid ball bearing assembly and the potentially misaligned drawer-cabinet interface. It mediates the transmission of forces and positions, allowing the ball bearings to maintain their load capacity while the elastic arm absorbs the assembly tolerance variations that would otherwise limit performance
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 enables flexible compensation for assembly tolerance, supports high loads, and integrates with soft-closing designs, ensuring smooth and reliable operation of drawers despite variations in assembly precision.
Implementation Method 1
The support member has a fixing portion and a resilient arm connected to the fixing portion
Data Source
AI summary
A slide assembly includes a first rail, a second rail and at least one positioning device. The first rail has a first elongate body. The second rail is slidable relative to the first rail and has a second elongate body. At least one of the first elongate body and the second elongate body has an opening. The at least one positioning device has a support member and a dowel. The support member has a fixing portion and a resilient arm connected to the fixing portion. The fixing portion is fixed to the at least one of the first elongate body and the second elongate body. The dowel is disposed on the resilient arm and corresponds in position to the opening.