Folding Door Hinge Rack and Pinion Adjustment

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Solution Overview

Problem

Existing hinges for folding doors require cumbersome adjustments with clamping screws, leading to unstable intermediate conditions and limited stepless variable adjustment due to the need for teeth in elongated holes, making it difficult to accommodate different panel thicknesses.

Innovation Solution

A transmission device that converts rotary movement into longitudinal movement for adjustable hinges, allowing for self-locking, stepless adjustments without loosening and tightening clamping screws, ensuring stability and precision in adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an elongated hole with fine teeth and a clamping screw is used for adjustment, then locking stability is maintained, but the adjustment process becomes cumbersome and time-consuming

Engineering Contradiction:

Improvelocking stabilityVSAvoidadjustment process

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the traditional mechanical adjustment system (elongated hole with teeth and clamping screw) with a rack and pinion gear mechanism. The rotary movement of the pinion gear directly drives the rack to move longitudinally, eliminating the need to loosen and tighten clamping screws while maintaining stable locking through the self-locking nature of the gear mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The rack and pinion transmission device is self-locking, meaning it automatically maintains its position without requiring additional locking mechanisms. Once the pinion gear is rotated to the desired position, the rack remains locked in place due to the mechanical engagement of the gear teeth, eliminating the need for separate clamping screws to maintain the adjusted position.

Inventive Principle:

Principle #25Self-service

2Reliability

If an elongated hole with teeth is used for adjustment, then locking stability is maintained, but stepless variable adjustment is not possible

Engineering Contradiction:

Improvelocking stabilityVSAvoidstepless variable adjustment

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent replaces the discrete tooth-based positioning system with a continuous rack and pinion gear mechanism. The rack features continuous linear engagement surfaces rather than discrete teeth, allowing the pinion gear to rotate to any position and lock the rack at any point along its range, enabling stepless variable adjustment while maintaining stability through the gear engagement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If clamping screws are loosened for adjustment, then adjustment is possible, but unstable intermediate conditions occur

Engineering Contradiction:

Improveadjustment capabilityVSAvoidintermediate stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The rack and pinion transmission device maintains continuous mechanical engagement throughout the adjustment process. The pinion gear remains meshed with the rack at all times, providing constant positional stability. The adjustment is achieved by simply rotating the pinion gear, which smoothly moves the rack to the desired position without requiring the disengagement or loosening of any clamping elements.

Inventive Principle:

Principle #25Self-service

4Manufacturing precision

If multiple hinges are adjusted simultaneously, then consistency is achieved, but the process becomes more time-consuming

Engineering Contradiction:

Improveadjustment consistencyVSAvoidadjustment speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The simplified rack and pinion mechanism reduces the adjustment process to a single rotational motion, making it faster and easier to replicate across multiple hinges. The self-locking nature of the gear mechanism ensures that each hinge can be quickly adjusted and locked without requiring multiple steps or tools, thereby increasing productivity while maintaining consistency through the standardized gear engagement mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 simple, stable, and precise stepless adjustments in hinge length, maintaining stability throughout the process and accommodating various panel thicknesses without the need for teeth, improving usability and flexibility.

Implementation Method 1

a transmission device for converting a rotary movement into a longitudinal movement is provided

Methodology Applied

Scientific EffectRack and pinion mechanism: Rack and Pinion

Data Source

PatentUS8707517B2Hinge for a folding door

Publication Date: 2014.04.29 JULIUS BLUM GMBH

AI summary

A hinge for a folding door, in particular for movable furniture parts, has at least one abutment part with a first section for securing the hinge to a furniture part and a second section which is at an angle thereto and is adjustable in length. The adjustment in length of the second section is performed using a transmission device for converting a rotary movement into a longitudinal movement.