Power Tool Attachment Locking for External Release Access
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Solution Overview
Problem
Existing attachments for hand-held power tools require operators to reach into the interior space to release the locking mechanism, which is inconvenient.
Innovation Solution
The locking body is rotatably mounted about the support axis, allowing for a tangential or rotary movement to engage or disengage the locking contour with the counter-locking contour, thereby facilitating easy attachment and detachment without requiring access to the interior space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the locking body is mounted on a rotating component (machine output element), then the locking mechanism can be compactly integrated, but the operator must reach into the interior space to release the lock which is inconvenient
Solution Approach 1:
The locking body is inverted from being mounted on the rotating machine output element to being mounted on the stationary attachment housing. This inversion allows the locking contour to engage with a counter-locking contour on the machine output element while the actuation interface remains externally accessible on the attachment housing, resolving the contradiction between compact integration and operational accessibility.
Solution Approach 2:
A tangential actuating force applied to the locking body serves as an intermediary mechanism. This force, applied through an externally accessible interface on the attachment housing, generates the necessary moment to move the locking contour in or out of engagement with the counter-locking contour, eliminating the need for direct internal access while maintaining secure locking.
2Device complexity
If the locking body moves radially to engage/disengage the lock, then the locking mechanism is simple, but it cannot achieve high tightening torque efficiently
Solution Approach 1:
The locking body utilizes a bayonet-shaped locking contour with curved geometry that engages with a corresponding counter-locking contour. This curved engagement path allows the locking body to convert small tangential movements into effective locking forces, achieving high tightening torque capability while maintaining a simple locking mechanism structure.
Solution Approach 2:
The locking mechanism transitions from static radial movement to dynamic tangential pivoting movement. The locking body pivots about the support axis in a tangential direction, creating a mechanical advantage that amplifies the applied force and enables high tightening torque to be achieved efficiently during the locking and unlocking process.
3Ease of manufacture
If the locking contour rotates with the machine output element, then the locking mechanism is simple to implement, but the locking force varies during rotation reducing reliability
Solution Approach 1:
The locking system is segmented into two independent rotational components: the locking body mounted on the stationary attachment housing and the counter-locking contour on the rotating machine output element. This segmentation allows the locking contour to remain stationary while the counter-locking contour rotates, ensuring consistent locking force throughout the rotation cycle while maintaining simple implementation through the bayonet engagement geometry.
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 design enhances convenience by allowing the attachment to be easily locked and unlocked without the need for operator access to the interior space, improving user experience and efficiency.
Implementation Method 1
a spring assembly, which loads the locking element in the direction of the locking position
Implementation Method 2
the locking body is rotatably mounted about the support axis for adjustment between the locking position and the unlocking position. Thus, the at least one locking contour can be brought into engagement with or disengaged from the counter-locking contour by a tangential pivoting movement or rotary movement of the locking body
Data Source
AI summary
An attachment for a hand-held power tool, wherein the attachment has an attachment housing and a drive element on a drive side, which drive element can be coupled to a machine output element of the hand-held power tool in order to drive the attachment and is firmly connected to an output element of the attachment or is motion-coupled via a gear to drive a working tool, wherein the attachment has a fastening device on the drive side for detachable fastening to the hand-held power tool, wherein the fastening device has at least one support surface that is stationary with respect to the attachment housing for providing support on the hand-held power tool in the direction of a support axis and at least one locking body adjustable between a locking position and an unlocking position and loaded into the locking position by a spring assembly.