Drop-in Anchor Setting Tool Axial Impact Transmission
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Solution Overview
Problem
Existing setting tools for drop-in anchors in stone or mineral construction materials face inefficiencies in drilling and driving due to the lack of effective transfer of percussive energy, leading to incomplete borehole formation and reduced drilling performance.
Innovation Solution
A setting tool comprising a first part with a percussive shank and plunger, and a second part with a slip-on sleeve and drill bit, where the plunger's impact surface allows for direct transmission of shock waves to the drill bit, minimizing parasitic energy loss and ensuring proper borehole depth, with a cylindrical design and elastic plastic sleeve for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the setting tool uses indirect impact transmission through drill bit and hood, then the device complexity is reduced, but the energy transmission efficiency deteriorates causing cavities and incomplete borehole formation
Solution Approach 1:
The setting tool is divided into two separate parts: a driving tool with plunger and impact surface, and a drilling tool with drill bit. This segmentation allows direct axial impact transmission from plunger to drill bit through the expansion body, eliminating energy loss pathways while keeping each component relatively simple in structure.
Solution Approach 2:
The expansion body serves as an intermediary element that directly transmits the impact force from the plunger to the drill bit along the axis. This intermediary structure ensures efficient energy transmission without the need for complex indirect transmission mechanisms through hood and drill bit assemblies.
2Productivity
If the setting tool uses indirect impact transmission through hood and drill bit, then the manufacturing simplicity is improved, but the drilling performance deteriorates due to parasitic energy channels
Solution Approach 1:
By separating the driving function (plunger) from the drilling function (drill bit) and connecting them through direct axial impact transmission via the expansion body, the system achieves high drilling performance while maintaining manufacturing simplicity. Each segmented component can be manufactured independently using standard processes.
Solution Approach 2:
The harmful indirect transmission pathway through hood and drill bit assembly is extracted and eliminated. Only the essential direct axial impact transmission path is retained, removing parasitic energy channels that would otherwise reduce drilling performance.
3Loss of energy
If the setting tool allows radial contact between parts, then the assembly stability is improved, but the energy transmission efficiency deteriorates due to secondary impact channels
Solution Approach 1:
The impact transmission is localized to the axial direction only, with the plunger contacting the expansion body at a specific impact surface. Radial contact surfaces are eliminated or minimized, ensuring that percussive energy is transmitted only along the intended axial path without diversion into radial secondary channels.
Solution Approach 2:
The contact geometry is designed asymmetrically where the plunger has a specific impact surface orientation that allows axial impact transmission but prevents radial contact. This asymmetric design ensures unidirectional energy flow from plunger through expansion body to drill bit, stabilizing the energy transmission path.
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
Enhances drilling performance by efficiently transferring percussive energy, preventing cavity formation and ensuring accurate anchor setting, while maintaining drilling efficiency and user feedback through contact with the substrate.
Implementation Method 1
Contact of the plunger with the slip-on sleeve permits conveyance of an impact wave from the shank to the tip of the drill bit on the axis
Data Source
AI summary
The setting tool (1) has a first part (2) for driving in a drop-in anchor and a second part (3), placeable on the first part along an axis (8), for drilling a drill hole for the drop-in anchor. The first part (2) has an insertion end (5) for a percussive portable power tool, a plunger (6) having an impact surface (12) and a piece (16) of a rotary coupling. The second part (3) has a slip-on sleeve (20), which coaxially surrounds the plunger (6) and bears against the impact surface (12) of the plunger (6), a counterpart (33) for the rotary coupling and a drill bit (23) permanently connected to the slip-on sleeve (20).