Drawer Pull-Out Guide With Overload-Protected Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drawer extension guides with positive control systems, such as rack-and-pinion arrangements, are prone to damage from overloading or improper handling, leading to non-synchronous movement and potential breakage.
Innovation Solution
Incorporating an overload protection mechanism that reversibly interrupts the force flow on the positive control mechanism when a predetermined threshold is exceeded, using couplings like slipper or magnetic couplings to prevent damage and ensure slip-free movement, allowing the system to re-establish force flow when within tolerable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a positive control system (rack-and-pinion arrangement) is used to establish the movement sequence of rails and carriages, then the movement synchronization is improved, but the system becomes vulnerable to damage from overloading or improper handling
Solution Approach 1:
The patent incorporates an overload protection mechanism that acts as a pre-established safety feature. This mechanism includes a yieldable element (such as a spring or deformable component) that is designed to deform or disengage when excessive force is applied, thereby protecting the rigid positive control system from damage before the damage can occur. The protection is built into the system design in advance, not added as an afterthought.
Solution Approach 2:
The patent introduces an intermediary overload protection mechanism between the external forces and the positive control system. This intermediary element absorbs or redirects excessive forces, preventing them from reaching the vulnerable rack-and-pinion arrangement. The intermediary acts as a buffer that allows normal operational forces to pass through while blocking or dissipating abnormal excessive forces.
2Ease of operation
If a rigid positive control mechanism is used to prevent slip-free movement, then movement control is improved, but the system becomes prone to breakage under abnormal loads
Solution Approach 1:
The patent transforms the static, rigid positive control system into a dynamic system that can adapt its rigidity based on operational conditions. The yieldable element or overload protection mechanism allows the system to be rigid under normal operational loads (providing precise movement control) but becomes flexible or disengages under excessive loads (preventing breakage). This dynamic adaptation enables the system to maintain control when needed while protecting itself when not needed.
Solution Approach 2:
The patent changes the physical parameters of the control system by incorporating elements that can change their mechanical properties. The yieldable element changes from a rigid state under normal loads to a deformed or disengaged state under excessive loads. This parameter change allows the system to maintain its positive control function during normal operation while automatically protecting itself when abnormal forces are applied.
3Measurement precision
If the positive control system continuously transmits force to maintain synchronization, then movement accuracy is improved, but the risk of damage from overloading increases
Solution Approach 1:
The patent converts the potentially harmful effect of excessive forces into a beneficial protective mechanism. The overload protection system is designed so that when excessive forces are applied, the yieldable element deforms or disengages in a controlled manner, transforming the harmful overload into a safe, reversible event. This allows the system to survive overload conditions that would otherwise cause catastrophic damage, and the deformation or disengagement serves as a visual or functional indicator that an overload event has occurred.
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
Prevents damage to the positive control mechanism by decoupling force transmission during overloading, ensuring smooth and synchronized movement between the drawer extension guide components, thereby enhancing durability and reliability.
Implementation Method 1
the overload protection means has at least one—preferably self-switching—coupling which provides for decoupling the positive control as from a predetermined threshold value
Implementation Method 2
In this connection it is advantageously possible, for example, to use slipper couplings which reversibly interrupt the flow of force without an outside influence when a defined torque is reached
Data Source
AI summary
A pull-out guide for drawers includes a body rail to be fastened to a furniture body, a drawer rail to be fastened to the drawer, and a center rail movably mounted between the body rail and the drawer rail. The relative motion sequence of the rails is determined by a forced control unit, and the forced control unit has a synchronization wheel designed as a gear wheel, the synchronization wheel interacting with a running surface arranged or formed on the rails and/or with a running surface of a carriage, which is slidably mounted between the rails. An overload protection device is provided for reversibly lifting the forced control unit of the rails.