Drawer system and drawer lock
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Solution Overview
Problem
Existing drawer systems, including desks and file cabinets, often allow multiple drawers to be pulled out simultaneously, leading to unstable or unsafe conditions due to the lack of effective locking mechanisms for bidirectional drawers.
Innovation Solution
A bidirectional drawer system with a drawer interlock mechanism that includes cams and cam followers, which prevent simultaneous movement of drawers by engaging cam surfaces and locks, ensuring that only one drawer can be extended at a time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple drawers are allowed to be pulled out simultaneously, then ease of operation is improved, but stability deteriorates due to instability arising when multiple drawers are extended at the same time
Solution Approach 1:
The drawer lock mechanism applies preliminary anti-action by preventing the harmful action (simultaneous extension of multiple drawers) before it can occur. The lock mechanism is positioned to engage with drawer stops before any drawer can be fully extended, thereby preemptively blocking the unstable configuration from forming.
Solution Approach 2:
The drawer lock serves as an intermediary mechanism between the drawers and the frame. It mediates the interaction by selectively allowing or preventing drawer extension based on the positions of other drawers, thus maintaining stability while still permitting operation.
2Stability of the object's composition
If a drawer lock mechanism is implemented to prevent simultaneous drawer extension, then stability is improved, but device complexity increases due to additional locking components
Solution Approach 1:
The drawer lock mechanism merges multiple functions into a single integrated component structure. The lock body, locking members, and engagement features are combined into one assembly that performs both locking and guiding functions, thereby reducing overall device complexity despite adding stabilization capability.
Solution Approach 2:
The drawer lock mechanism is designed to be self-actuating through the natural movement of drawers. As drawers are extended or retracted, the locking members automatically engage or disengage based on drawer position, eliminating the need for external actuators, motors, or complex control systems.
3Ease of manufacture
If a passive drawer lock mechanism is used, then ease of manufacture is improved, but reliability deteriorates because passive mechanisms may not reliably prevent simultaneous drawer movement
Solution Approach 1:
The locking members utilize curved cam surfaces that passively convert the linear motion of drawer extension into rotational engagement. This curved geometry ensures reliable locking action through mechanical geometry alone, without requiring active control, while maintaining ease of manufacture through simple machined surfaces.
Solution Approach 2:
The passive lock mechanism incorporates dynamic elements that adapt to drawer positions in real-time. The locking members are designed to automatically adjust their engagement state based on the movement and position of adjacent drawers, ensuring reliable prevention of simultaneous extension without requiring external actuation.
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 effectively prevents simultaneous extension of drawers, maintaining stability and safety by ensuring that only one drawer can be moved to an extended position at a time, thereby preventing unstable conditions.
Implementation Method 1
a cam with a cam surface, and a cam follower operable to interface with the cam surface
Implementation Method 2
the cam followers to bindingly engage the respective cam surfaces
Data Source
AI summary
A bidirectional drawer system is disclosed. The bidirectional drawer system can include a frame. The bidirectional drawer system can also include first and second drawers slidably coupled to the frame. Each of the first and second drawers can be movable between a retracted position and first and second extended positions on opposite sides of the retracted position. In addition, the bidirectional drawer system can include a drawer interlock mechanism. The drawer interlock mechanism can include first and second interlock portions associated with the first and second drawers, respectively. The first interlock portion can have a cam with a cam surface, and a cam follower operable to interface with the cam surface. The second interlock portion can have a cam lock with a cam lock surface, and cam follower operable to interface with the cam lock surface. With the first and second drawers in the retracted positions, movement of the first drawer toward the first extended position can cause the cam follower of the first interlock portion to engage the cam surface and the cam follower of the second interlock portion to engage the cam lock surface thereby preventing movement of the second drawer out of the retracted position.