Floating Lock Mounting for Door Handle Tolerance Compensation

Solution Overview

Problem

Existing door leaf manufacturing processes face challenges in accommodating manufacturing tolerances of locks, leading to suboptimal connections between doors and handles, which can result in functional defects and mechanical damage.

Innovation Solution

A locking device with a floating bearing system, where the handle pin or lock nut can move elastically in radial directions, allowing for tolerance compensation between the lock and door handle, ensuring precise and secure assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If machine milling is used to produce receptacles for door handle bearings, then productivity is improved, but manufacturing precision deteriorates due to tolerance accumulation

Engineering Contradiction:

Improveindustrial mass production capabilityVSAvoidpositioning precision of handle bearing receptacles

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent changes the geometric parameters of the handle receiving opening by providing a larger opening diameter than the handle pin diameter, enabling elastic floating mounting that accommodates tolerance variations while maintaining secure connection

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adaptability through elastic floating mounting, allowing the handle pin to move elastically within the receiving opening to compensate for positioning tolerances, transforming a static rigid connection into a dynamic adaptive one

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If tolerances on the lock are reduced, then manufacturing precision is improved, but cost increases significantly

Engineering Contradiction:

Improvelock component toleranceVSAvoidproduction cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent introduces the elastic floating mounting mechanism as an intermediary element between the lock and handle, which absorbs tolerance variations without requiring tighter manufacturing tolerances on the lock components themselves

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the geometric parameters of the handle receiving opening by providing a larger opening diameter than the handle pin diameter, enabling elastic floating mounting that accommodates tolerance variations while maintaining secure connection

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If a frictional connection is used instead of positive connection, then ease of manufacture is improved, but reliability deteriorates due to wobbling and mechanical damage

Engineering Contradiction:

Improveassembly simplicityVSAvoidhandle connection stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the geometric parameters by providing a larger handle receiving opening diameter than the handle pin diameter, enabling elastic floating mounting that provides both positive connection and tolerance compensation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adaptability through elastic floating mounting, allowing the handle pin to move elastically within the receiving opening to compensate for positioning tolerances, transforming a static rigid connection into a dynamic adaptive one

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 enables simpler and cost-effective industrial mass production of door leaves with long-lasting, comfortable door handles, while maintaining high-quality functional reliability and appearance.

Implementation Method 1

the handle pin (44) is elastically floatingly mounted in the handle receiving opening (110) for limited movement in any direction perpendicular to the axis of rotation (106)

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

the lock nut (104) is floatingly mounted in the lock case (100) for limited movement in any direction perpendicular to the axis of rotation (106)

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP4563774A1Lock device with floating mounting for tolerance compensation, door leaf provided therewith and production method

Publication Date: 2025.06.04 HUGA KG

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AI summary

In order to enable simpler industrial large-scale production of door leaves (10) which are provided with locking devices (8) which can be provided inexpensively and with door handles (42) which can be operated comfortably over a long period of time, the invention provides a locking device (8) for a door leaf (10), comprising a lock (30) and a handle pin (44), wherein the lock (30) has a lock case (100) with a through-opening (102) for the handle pin (44) and a lock nut (104) which is rotatably received in the lock case (100) about a rotational axis (106) extending through the through-opening (102), said nut having a handle receiving opening (110) for the positive and rotationally fixed reception of the handle pin (44),wherein a) the handle pin (44) is elastically floatingly mounted in the handle receiving opening (110) for limited movement in any direction perpendicular to the rotation axis (106), and/or b) the lock nut (104) is floatingly mounted in the lock case (100) for limited movement in any direction perpendicular to the rotation axis (106). Furthermore, a method for manufacturing the door leaf (10), including the assembly of door handles (42), is described.