Cold Room Sliding Door Bush Assembly for Variable Panel Thickness

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Solution Overview

Problem

Current devices for releasing cold room sliding doors require multiple bush types for different door panel thicknesses and opening directions, leading to increased manufacturing costs and inventory needs.

Innovation Solution

A telescopic bush assembly with adjustable length and dual guide mechanisms for accommodating various door thicknesses and opening directions, allowing a single set of components to be used for multiple door configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple bush types are used for different door panel thicknesses and opening directions, then the device can accommodate various door configurations, but the manufacturing complexity and inventory requirements increase

Engineering Contradiction:

Improveadaptability to different door configurationsVSAvoidnumber of bush types

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The bush is designed with a universal structure that can accommodate multiple door panel thicknesses (70mm, 80mm, 90mm, 100mm, 120mm) and both rightward and leftward opening directions through a single standardized component design, eliminating the need for multiple specialized bush types

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The bush incorporates adjustable elements that allow dynamic adaptation to different door configurations. The bush can be adjusted or configured to work with various thicknesses and opening directions, transforming a static single-purpose component into a dynamic multi-purpose component

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple bush types are stocked for different door specifications, then all door configurations can be serviced, but the inventory requirements and manufacturing costs increase

Engineering Contradiction:

Improvecoverage of door specificationsVSAvoidinventory of bush types

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

A single standardized bush design serves multiple door specifications, allowing manufacturers to stock only one type of bush instead of ten different types, thereby reducing inventory requirements while maintaining coverage for all door configurations

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the bush length is made equal to the door panel thickness, then the bush can be fully incorporated into the door panel, but different bush lengths are required for different door thicknesses

Engineering Contradiction:

Improveintegration of bush into door panelVSAvoidvariety of bush lengths

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bush design incorporates adjustable length capabilities or modular sections that allow it to adapt to different door panel thicknesses while maintaining full integration. This dynamic adjustment capability eliminates the need to manufacture multiple fixed-length bush variants

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

Enables a single set of components to be stocked for a range of door panel thicknesses and opening directions, reducing manufacturing complexity and inventory requirements while maintaining effective door operation.

Implementation Method 1

a preloaded helical spring, mounted coaxially on the central shaft such that one end rests on a relative shoulder provided inside the bush, while the other end of the spring rests on a collar provided on the central shaft, the spring maintaining the shaft-handle assembly in a position withdrawn outward from the door panel when this latter has been released

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a number of pawls projecting radially from said central shaft equal to the number of slots provided in said bush, each pawl engaging in a relative slot; the bush laterally presenting at least two opposing through slots, the axes of which must have their inclination opposite the bush axis

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentEP2439366B1Device for opening sliding doors for cold rooms

Publication Date: 2015.12.30 DERVET

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AI summary

The device (10) enables a cold room sliding door to be released from its closed position, and comprises: a bush (12) incorporated into the thickness of the door panel (56) and fixed to the door panel (56) such that its axis is perpendicular to this latter (56); a central shaft (20) coaxially inserted into the bush (12) to be able both to rotate about the axis of this latter (12) and to move along said axis; means (26, 24; 27, 24) for guiding the movement and rotation of the central shaft (20), which enable it to rotate in the direction compatible with the door opening direction; elastic return means (28) to bring the central shaft (20) into a position withdrawn outwards from the door panel (56) when left free to move coaxially; external means (44) for rotating the central shaft (20); internal means (46) for rotating the central shaft (20) and provided with a striker (54) adapted to come into contact with a fixed point. The bush (12) has a length less than the thickness of all or at least part of the door panels (56) of such doors, a ring cap (14) being provided coupleable coaxially to the bush (12) such that the bush (12)-ring cap (14) assembly has a length adapted to the thickness of the specific door panel (56).