Rotating Handrail Mounting via Locking Bolt and Receiving Hole

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Solution Overview

Problem

Existing handrails face challenges in manufacturing complexity, increased production costs, and aesthetic issues due to welding or screw-based mounting methods, which compromise stability and safety, especially for secure installations like stairs and public transport.

Innovation Solution

A handrail design featuring a gripping body with a receiving hole and a fastening arm equipped with a locking bolt, allowing for simple and secure attachment by rotation, enabling separate manufacturing and assembly, reducing cleaning complexity, and enhancing stability and flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the holding device is welded directly to the gripping body, then the connection strength is improved, but the manufacturing complexity and production cost increase

Engineering Contradiction:

Improveconnection strengthVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The handrail system is divided into separate components: the gripping body and the holding device are manufactured independently and then connected through a receiving hole and locking mechanism, avoiding direct welding while maintaining connection strength

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The holding device is inserted into the gripping body through a receiving hole, with the locking bolt engaging inside the hollow gripping body, creating a nested structure that eliminates welding complexity

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If the holding device is screwed to the gripping body using a plate with four bores, then the manufacturing simplicity is improved, but the aesthetic impression and handling are worsened

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidaesthetic impression

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The mounting plate with four bores is completely removed from the design. Instead, a single locking bolt with a small head is used, which can be positioned aesthetically on the gripping body without requiring a large visible plate

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of attaching the holding device to the outside of the gripping body with a plate, the locking mechanism is inverted to work from the inside through a receiving hole, allowing the bolt head to be positioned minimally and aesthetically

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If the holding device is screwed to the gripping body using a plate with four bores, then the manufacturing simplicity is improved, but the stability is worsened due to remaining play

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidstability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The receiving hole is pre-formed in the gripping body with precise dimensions and positioning, ensuring that the locking bolt engages firmly without play. The locking mechanism is designed in advance to provide stable connection through the hollow body structure

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The locking bolt acts as an intermediary element that transfers loads firmly between the holding device and the gripping body through the receiving hole, eliminating play while maintaining manufacturing simplicity

Inventive Principle:

Principle #24Intermediary (Mediator)

4Strength

If welding is used to attach the holding device, then the connection strength is improved, but the cleaning complexity increases

Engineering Contradiction:

Improveconnection strengthVSAvoidcleaning complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

By separating the holding device and gripping body into distinct components connected through a receiving hole, the design eliminates welded joints and associated cleaning requirements, allowing each component to be cleaned independently and simply

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP3246487B1Handrail with fixing handle which can be rotated inwards

Publication Date: 2019.08.21 TIBU HOLZTREPPENBAU

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Figure 3A~3B

AI summary

The invention relates to a handrail comprising a gripping body and a fastening arm, wherein the fastening arm has a locking bolt and the gripping body has a receiving hole aligned to it, so that the fastening arm can be fixed in the gripping body by rotation.