Handle Holder with Self-Locking Hook for One-Handed Release

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Solution Overview

Problem

Existing handle holders require two hands for assembly and active locking, pose a risk of injury, and necessitate significant force to twist the screw cap, making them cumbersome and unsafe.

Innovation Solution

A handle holder design where a spring-prestressed locking lever automatically locks the adapter part to the function carrier, allowing one-handed release with an external force, using a latching hook that pivots into a locking position upon insertion and can be released manually, ensuring self-locking engagement and safe detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a twist-lock fastener with rotary knob is used to lock the adapter part, then the locking is secure, but two hands are required for assembly and a relatively large amount of force is needed to twist the screw cap

Engineering Contradiction:

Improvelocking securityVSAvoidassembly ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The locking hook is designed to automatically lock itself into the latched position through its own pivoting motion during insertion, without requiring manual twisting or active locking actions by the user. The spring automatically returns the locking hook to the latched position after insertion, making the system self-servicing.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The complex twist-lock mechanism with rotary knob is replaced by a simpler pivoting hook mechanism that uses spring force and geometric constraints to achieve automatic locking, eliminating the need for twisting motions and reducing the required degrees of freedom.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If wire-shaped hook elements are used for connection, then the adapter part can be detachably connected, but there is a risk of injury particularly on the wire-shaped hook elements

Engineering Contradiction:

Improvedetachable connectionVSAvoidinjury risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The locking hook is designed as a robust, replaceable component that can be easily replaced if damaged, and the overall mechanism is designed to minimize injury risk while maintaining detachable functionality. The patent acknowledges potential injury risks and provides design considerations for safe disposal or replacement of damaged components.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If both latching lugs must be pressed in at the same time for detachment, then the connection is secure, but the process is time-consuming

Engineering Contradiction:

Improveconnection securityVSAvoiddetachment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The detachment process is segmented into sequential steps rather than requiring simultaneous action. The user first presses the actuating lever to move the locking hook to the release position, then pulls the adapter part, allowing the locking hook to disengage in a controlled sequence rather than requiring simultaneous pressing of multiple lugs.

Inventive Principle:

Principle #1Segmentation

4Ease of operation

If the push button or locking lug is pressed in while the adapter part is being pulled out, then release can be achieved, but there is a risk of injury

Engineering Contradiction:

Improverelease easeVSAvoidinjury risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The actuating lever is pressed in advance to move the locking hook to the release position before the adapter part is pulled out. This preliminary action ensures that the locking hook is in the correct position for safe detachment, eliminating the need to press buttons or lugs during the pulling motion itself.

Inventive Principle:

Principle #10Preliminary action

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 automatic locking and one-handed release of the adapter part from the function carrier, reducing assembly complexity and safety risks while eliminating the need for excessive force, enhancing user safety and convenience.

Implementation Method 1

Prestressing the locking lever by means of a spring in such a way that the locking hook automatically assumes the locking position

Methodology Applied

Scientific EffectSpring force: Spring

Data Source

PatentEP2845531B1Handle holder for actuating handles or the like

Publication Date: 2016.03.09 NOLLE PROFI BRUSH BURSTEN UND PINSELTECHN E K

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Figure 3~4b
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AI summary

The present invention relates to a handle holder for connecting an operating handle to a functional carrier, e.g., a bristle carrier or the like, comprising an adapter part (1) with a handle receptacle (6) and connecting means attached to the adapter part (1) for detachably connecting the adapter part (1) to the functional carrier. The connecting means consist of a locking hook which is pivotably mounted about a pivot axis (11) of the adapter part (1) such that it can be pivoted from a locked position against the force of a spring (12) to an unlocked position. An operating lever (13) has an operative connection with the locking hook such that the locking hook can be moved into its unlocked position by pivoting the operating lever (13).