Pull-Out Guide Spring Bar Clamping to Reduce Slippage and Wear
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Solution Overview
Problem
Existing pull-out guides for household appliances face issues with weak holding forces, slippage, and high wear due to rigid locking mechanisms, which lead to ineffective rail fixation and potential jams.
Innovation Solution
A pull-out guide with integrally formed spring bars on the rails that clamp the rolling element cage, creating frictional forces for secure rail fixation without additional components, using a clamping mechanism that avoids slippage and reduces wear by utilizing elastic design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rigid locking device with an embossment is used to fix the rail position, then the structure is simple, but the holding force is low and slippage occurs
Solution Approach 1:
The patent replaces the rigid locking mechanism with a dynamic spring bar that can flex and adapt. The spring bar is designed to be elastically deformable, allowing it to dynamically adjust to the rolling element cage and maintain optimal clamping force, thereby increasing holding force while maintaining structural simplicity.
Solution Approach 2:
The patent changes the physical state of the locking element from rigid to elastic. By using a spring bar with specific elastic properties, the system can vary the clamping force parameter dynamically, ensuring sufficient holding force without increasing structural complexity.
2Device complexity
If a rigid embossment locking device is used, then the structure is simple, but wear is high and locking forces reduce over time
Solution Approach 1:
The spring bar's elastic nature allows it to absorb and distribute wear more effectively. Instead of a rigid contact that concentrates stress, the flexible spring bar distributes the contact forces, reducing wear on both the locking device and the rolling element cage, thereby maintaining reliable locking forces over time.
Solution Approach 2:
By changing from a rigid to an elastic material property, the system reduces the contact stress and distributes wear more evenly. This parameter change in material flexibility directly improves the durability and reliability of the locking mechanism over extended use.
3Force
If additional locking components are added to increase holding force, then the holding force is sufficient, but the device complexity increases
Solution Approach 1:
The spring bar integrates multiple functions into a single component: it provides the clamping force, acts as the locking element, and serves as a wear-compensating mechanism. This merging of functions achieves sufficient holding force without adding separate locking components, thereby maintaining device simplicity.
Solution Approach 2:
The spring bar is designed as a multi-functional element that simultaneously provides structural support, locking force, and wear compensation. This universal component replaces what would traditionally require multiple specialized parts, achieving high holding force while minimizing component count.
4Device complexity
If a rigid locking mechanism is used, then the structure is simple, but jams can occur due to unfavorable ball impact
Solution Approach 1:
The flexible spring bar acts as a shock absorber, dynamically responding to impacts from the rolling elements. Instead of rigidly transmitting impact forces that could cause jamming, the spring bar flexes to absorb the shock, ensuring smooth operation while maintaining the simplicity of the locking structure.
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 reliable and durable rail fixation with adjustable holding forces, preventing slippage and jams, while maintaining a compact design suitable for various applications in household appliances and furniture.
Implementation Method 1
the elastic design of the spring bar prevents blockage of the drawer guide
Implementation Method 2
forces are applied perpendicular to the longitudinal direction of the rails by the spring bar to the rolling element cage and the other rail, which leads to frictional forces that hold the movable rail
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
An extension guide (1) comprises at least two rails (2, 5) movable relative to each other, between which rolling elements (13) held in a rolling element cage (14) are arranged and which can roll on raceways on the rails (2, 5), wherein the rails (2, 5) are detachably held in at least one position by a holding device (9), the holding device (9) comprising at least one spring bar (10) formed integrally with one of the rails (2, 5), by means of which the rolling element cage (14) can be clamped onto the other rail (2, 5). This allows the movable rail to be held in a predetermined position on the stationary rail by simple means.