Actuation Switch Safety Device for Hand-Held Setting Tools
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Solution Overview
Problem
Existing positioning and actuation devices for hand-held setting tools require high pressing forces and have limited movement paths, leading to inconsistent actuation angles and inefficiencies when the tool is tilted from a vertical orientation.
Innovation Solution
A safety device with radially circumferential annular recesses allows the blocking element to move between two positions, maintaining rotational symmetry and enabling longer movement paths with reduced force expenditure, allowing actuation at various orientations including tilted positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball-controlled safety locking device with a single annular receiving space is used, then the setting tool can be actuated only in a vertical or almost vertical orientation opposite to the force of gravity, but the diameter of the ball defines the maximum movement path which is available in the release position, requiring a very high pressing force for this short movement path
Solution Approach 1:
The single annular receiving space is segmented into two separate annular recesses (first and second recesses) positioned at different locations. The blocking element can move between these two recesses, creating distinct blocking and release positions. This segmentation allows the holder to have a longer movement path while maintaining the safety locking function, thereby reducing the required pressing force.
Solution Approach 2:
The solution transitions from a single-dimensional blocking mechanism (one receiving space) to a two-dimensional arrangement (two annular recesses positioned radially opposite each other). This dimensional change enables the blocking element to traverse a longer path through spatial redistribution, reducing the force concentration and allowing actuation at various orientations including tilted positions.
2Reliability
If a ball-controlled safety locking device with a single annular receiving space is used, then the safety device prevents actuation when oriented vertically, but widely differing angles result when the setting tool is lifted upward until released and when lowered until blocked again
Solution Approach 1:
The two annular recesses are positioned asymmetrically in the rotational direction relative to each other, creating a rotational asymmetry in the blocking mechanism. This asymmetric arrangement ensures that the blocking element engages at specific angular positions, providing consistent limiting angles regardless of whether the tool is lifted upward or lowered downward, thereby improving adaptability across different orientations.
Solution Approach 2:
The blocking element is designed to dynamically move between the two annular recesses based on the orientation and movement direction of the setting tool. This dynamic behavior allows the safety device to adapt to different actuation scenarios (lifting upward or lowering downward) while maintaining consistent angular limitations, enhancing the versatility of the device.
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
The solution provides a compact and efficient safety mechanism that prevents unintended actuation while allowing optimal force/path behavior, enabling actuation with reduced force and maintaining functionality across a range of orientations.
Implementation Method 1
A positioning device with actuating switching means for a hand-held setting tool... a safety device for preventing actuation of the actuation switch of the setting tool at a predetermined orientation of the setting tool
Data Source
AI summary
A positioning device for a hand-held setting tool (10) includes an actuating switching device having an actuation element (24), a switching link (30) for connecting an actuation element (24) to the actuation switch (13) of the setting tool (10) and having a switching member axially displaceable relative to a stationary, with respect to the holder, structural component. The device further includes a safety device (50) for preventing actuation of the actuation switch (13) at a predetermined orientation of the setting tool (10). The safety device (50) includes a displaceable blocking element (55), first and second annular recesses (51, 52) for receiving the blocking element and extending radially circumferentially about the structural component and about the switching member, respectively. The first (51) and the second (52) annular recesses are open toward the switching member and the structural component, respectively. The blocking element (55) is completely positionable in one of the first and second annular recesses (51) in an operational position of the actuation switching means.