Pull down bed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pull-down beds have design flaws that compromise the exterior appearance and allow dust and particles to enter the cabinet, as side undercuts are necessary for leg rotation but disrupt the cabinet's continuity and visibility of legs when closed, and fail to effectively conceal the legs within the cabinet.
Innovation Solution
A synchronization mechanism using a control rod, swinging arms, and guide members synchronizes the rotation of the bed frame and legs, allowing the legs to rotate between extended and retracted positions without side undercuts, ensuring the legs are concealed and preventing dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If side undercuts are provided on the panel to enable leg rotation, then the legs can rotate freely between extracted and retracted positions, but the exterior appearance of the cabinet is compromised and legs remain visible when the bed frame is closed
Solution Approach 1:
The synchronization mechanism performs preliminary action by coordinating the leg retraction to occur before or during the panel closure, ensuring legs are already retracted into the cabinet interior before the panel reaches the closed position. This eliminates the need for side undercuts and maintains appearance continuity.
Solution Approach 2:
The synchronization mechanism acts as an intermediary between the bed frame rotation and leg rotation, coordinating their movements through mechanical linkage (rack and pinion or lever-rod-plate system). This intermediary ensures legs retract in sync with panel closure, resolving the conflict between operation freedom and appearance continuity.
2Ease of operation
If side undercuts are provided on the panel to enable leg rotation, then the legs can move between positions, but dust and foreign particles can easily penetrate the cabinet when the bed frame is closed
Solution Approach 1:
The synchronization mechanism ensures legs are retracted into the cabinet interior before the panel completes its closure motion. This preliminary retraction action seals the cabinet interior from dust and particles, eliminating the harmful effect of particle penetration while maintaining leg rotation capability through coordinated motion.
Solution Approach 2:
The synchronization mechanism serves as an intermediary control system that coordinates leg retraction with panel closure, ensuring the cabinet remains sealed against dust and particles. The mechanical linkage (rack and pinion or lever-rod-plate) acts as the intermediary that translates bed frame motion into synchronized leg retraction.
3Shape
If a synchronization mechanism is added to coordinate leg rotation with bed frame rotation, then the legs can be concealed within the cabinet and appearance maintained, but the device complexity increases
Solution Approach 1:
The synchronization mechanism uses a simple intermediary system (rack and pinion or lever-rod-plate) that translates the rotational motion of the bed frame into coordinated leg retraction. This intermediary approach achieves appearance uniformity without requiring complex control systems, maintaining relatively simple device architecture.
Solution Approach 2:
The synchronization mechanism is self-service in that it automatically coordinates leg retraction with bed frame rotation through pure mechanical linkage. No external control systems, motors, or complex electronics are needed - the mechanical system self-regulates the coordination based on the inherent kinematics of the linkage.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A pull down bed (1) comprising: a cabinet (2) which is provided with a bed compartment; a plate-shaped bed frame (3) which is adapted to support a mattress and is hinged on the cabinet (2) so that it can rotate between a raised position in which the bed frame (3) is substantially vertical and is lodged inside said bed compartment, and a lowered position in which the bed frame (3) is substantially horizontal, at least partially outside said bed compartment; a leg (18), which is hinged onto the bed frame (3), and a synchronization mechanism (20) which is structured so as to synchronize the rotation of the leg (18) between a first and a second operating position with the rotation of the bed frame (3) between the lowered position and said raised position, respectively. In the first operating position, the leg (18) extends cantilevered below the lying plane of the bed frame (3) so as to be arranged resting on the ground (S), and in the second operating position, the leg (18) protrudes cantilevered from the bed frame (3) so as to be transverse to the lying plane of the bed frame (3) so as to be housed inside the bed compartment.