Auxiliary Handle Quick-Release Mechanism for Power Tools

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Solution Overview

Problem

Existing auxiliary handles for hand-held power tools require a large number of turns to release the lag hinge and loosen the clamping section, making re-positioning or removal cumbersome and time-consuming.

Innovation Solution

A quick-release device independent of the tensioning member allows for easy release and re-tightening of the clamping section, enabling rapid re-positioning of the gripping member and auxiliary handle, with a fixation device and actuation member that axially secures and releases the pivot pin, reducing the need for tedious rotation of the tensioning knob.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a tensioning member is used to tighten and loosen the clamping section, then the clamping section can be securely fastened, but a large number of turns are required to release and loosen it

Engineering Contradiction:

Improvesecure fastening of clamping sectionVSAvoidtime required to release and loosen

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention divides the release function into two independent systems: the tensioning member handles tightening while a separate quick-release device handles loosening. This segmentation allows each component to be optimized for its specific function, with the quick-release device providing rapid loosening without requiring multiple turns of the tensioning member.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The quick-release device acts as an intermediary mechanism that bypasses the tensioning member's rotational mechanism. When activated, it directly releases the pivot pin from the bearing section, providing a mediated path for rapid release that does not require reversing the tensioning member's action through multiple turns.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the quick-release device is made independent from the tensioning member, then rapid release and re-tightening is enabled, but the device complexity increases

Engineering Contradiction:

Improvespeed of re-positioning and removalVSAvoidnumber of components

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The quick-release device merges multiple functions into a single integrated mechanism: it controls both the release of the lag hinge and the loosening of the clamping section through one actuation. This combining of functions reduces the need for separate mechanisms while maintaining rapid release capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The quick-release device is designed as a multi-functional component that can both release the pivot pin from the bearing section and simultaneously loosen the clamping section. This universal design allows one device to perform multiple operations that would otherwise require separate mechanisms, thereby managing complexity while enhancing productivity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8186018B2Auxiliary handle for hand-held power tool

Publication Date: 2012.05.29 HILTI AG

AI summary

An auxiliary handle for a hand-held power tool (7) includes a lockable lag hinge (46) provided between the clamping section (21) and the gripping member (34) and having a pivot pin (47), a tightening member (51) for tightening and loosening the clamping section (21) and arranged on an end (48) of the pivot pin (47) of the lag hinge (46), a locking device (41) for locking and releasing the lag hinge (46), and an independent from the tensioning member (51), a quick-release device (56) for the locking device (41) and the clamping section (21) for displacing the locking device (410 in a position in which the lag hinge (46) is released and for loosening tightening of the clamping section (21).