Bed Telescopic Post Movement Transmission Mechanism

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Solution Overview

Problem

Existing bed side and head/foot part arrangements, such as those described in EP 2 052 707 A1, face issues with tilting and getting stuck when extending or retracting, especially when force is applied to only one end, leading to difficulties in smooth operation.

Innovation Solution

The introduction of movement transmission means, including shafts with gears and flexible tension members, facilitates kinematic coupling between post parts, preventing tilting and enabling smooth extension and retraction by transmitting movement between post parts, even when force is applied to one side.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the side parts are extended to cover more than half the length of the bed, then the security and comfort of the occupant is improved, but the assembly becomes prone to tilting and getting stuck when extending or retracting

Engineering Contradiction:

Improvesecurity of occupantVSAvoidsmooth operation of assembly

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

A movement transmission means is introduced as an intermediary element between the first and second post parts. This intermediary mechanism transmits movement from one post part to the other, ensuring that both post parts move symmetrically and preventing tilting during extension or retraction operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical coupling between post parts with a movement transmission means that uses a shaft with gears and racks. This substitution allows for smoother movement transmission and prevents the mechanical sticking issue that occurs in direct coupling systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If force is applied to only one end of the assembly when extending or retracting, then the operation is simplified, but the post parts may tilt and get stuck

Engineering Contradiction:

Improvesimplified operationVSAvoidstability of post parts

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The movement transmission means acts as a feedback mechanism that automatically balances the movement of both post parts. When force is applied to one end, the transmission means ensures that the other post part moves accordingly, maintaining stability and preventing tilting without requiring force application at both ends.

Inventive Principle:

Principle #23Feedback

3Reliability

If the entire length of the bed is secured by side parts, then the fall prevention is maximized, but the psychological comfort of the occupant may be compromised

Engineering Contradiction:

Improvefall preventionVSAvoidoccupant comfort and preference

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent enables dynamic adjustment of the side part length through the telescopic post parts that can extend and retract. This allows the side parts to be adjusted to different lengths according to occupant preference while maintaining adequate fall prevention, providing adaptability between security and comfort.

Inventive Principle:

Principle #15Dynamics

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

This solution allows for easy and smooth operation of longer bed side and head/foot parts by preventing tilting and ensuring smooth movement, enhancing usability and safety by allowing sections of the bed to be secured without compromising fall prevention.

Implementation Method 1

Gear wheels can be fastened in a rotationally fixed manner on the shaft of the first movement transmission means. The shaft is rotatably mounted either on the first post parts of the first post and the second post, while racks are attached to the second post parts of the first post and the second post, in which the gears engage.

Methodology Applied

Scientific EffectGear mechanism: Gear

Implementation Method 2

The movement transmission means transmits a movement between the first post part and the second post part of the first post to at least one of the two post parts of the second post.

Methodology Applied

Scientific EffectMechanical advantage: Mechanical Advantage

Implementation Method 3

A first flexible tension member, e.g. a rope, a chain, a belt or the like. This first flexible tension member is then connected to the end of the second post part of the first post facing away from the first post part and to the end of the second post part of the second post facing the first post part.

Methodology Applied

Scientific EffectTension: Tension

Data Source

PatentEP2263632B1Assembly forming the side, head and foot parts of a bed with a movement transfer means and bed with such an assembly

Publication Date: 2011.11.09 WISSNER BOSSERHOFF GMBH & CO KG

Figure 1
Figure 1b
Figure 1c

AI summary

The arrangement has two telescopic posts (1, 2) arranged at a distance parallel to each other. Movement between two post parts (21, 22) of one of the posts is transmitted on one of the post parts of the other post. A shaft rotates one of the posts for transmitting the movement to the post parts during the movement between the post parts. A flexible tension member e.g. rope, chain and belt, is connected with ends of the post parts of the posts, where the ends face the post parts. Gear wheels are rotatably fixed at the shaft. An independent claim is also included for a bed comprising upper and lower frames.