Power Tool Holding Unit With Damping for Fall Arrest Loads
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Solution Overview
Problem
Hand-held power tools face damage or breakage during falls due to force peaks and abrupt braking when using rigid arresting cables with low tensile elongation, particularly with bow or gripping-stirrup handles, which can lead to damage or breakage of the tool's housing or handles.
Innovation Solution
A holding unit with a receiving opening and a damping element, such as an elastic element, is integrated into the hand-held power tool's housing to absorb and distribute fall forces, using a fastening part that encloses the opening to secure the tool without damage, even with low-cost rigid arresting cables, and includes a movably mounted braking element to distribute forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid arresting cable with low tensile elongation is used to prevent the power tool from falling, then the tool can be secured without damage, but force peaks occur during abrupt braking that can damage the tool's housing or handle
Solution Approach 1:
The patent incorporates a damping element in advance within the holding unit, positioned between the arresting cable and the power tool housing. This cushioning element is pre-installed to absorb force peaks before they can damage the tool during a fall arrest event, resolving the contradiction between reliable fall protection and prevention of force peak damage.
Solution Approach 2:
The damping element acts as an intermediary component between the rigid arresting cable and the power tool housing. It mediates the force transmission by absorbing shock, allowing the arresting cable to provide reliable fall protection while preventing direct transmission of damaging force peaks to the tool structure.
2Object-affected harmful factors
If a damping element is added to absorb force peaks, then damage during falls is prevented, but the device complexity increases
Solution Approach 1:
The damping element is integrated into the existing holding unit structure rather than being added as a separate external component. The holding unit combines the fastening part, receiving opening, and damping element into a single integrated assembly, preventing force peak damage while minimizing the increase in overall device complexity.
Solution Approach 2:
The holding unit is designed to serve multiple functions: it provides the fastening connection to the arresting cable, defines the receiving opening for cable insertion, and incorporates the damping element for shock absorption. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving force peak protection.
3Ease of operation
If the receiving opening axis is transverse to the control switch actuation direction, then fall protection is provided for intuitive handles, but the structural design becomes more complex
Solution Approach 1:
The receiving opening is positioned with its axis transverse to the control switch actuation direction at a specific location on the housing. This local structural arrangement optimizes handle ergonomics and fall protection without requiring a complete redesign of the overall device architecture, thereby limiting the increase in device complexity while improving ease of operation.
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 effective damping and force distribution, preventing damage to the hand-held power tool during falls by cushioning force peaks and ensuring secure attachment to arresting cables or carabiner clips, thus enhancing safety and reducing the risk of tool breakage.
Implementation Method 1
at least one damping element for damping a force transferred from the holding means to the hand-held power tool
Implementation Method 2
the damping element be realized as an at least substantially elastic element
Data Source
AI summary
A hand-held power tool, in particular a saber saw, having at least one holding unit for fastening the hand-held power tool to a holding device, in particular to an arresting cable and/or carabiner clip. The holding unit includes at least one receiving opening for receiving the holding device, and at least one damping element for damping a force transferred from the holding device to the hand-held power tool, in particular to a housing of the hand-held power tool. The damping element includes an at least substantially elastic element that at least partially encloses the receiving opening and receives in a form-fitting manner a fastening part delimiting the receiving opening.