Powder Actuated Tool Charge Advance Ratchet Alignment
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Solution Overview
Problem
Existing powder actuated fastening tools fail to accurately advance powder charge strips, leading to potential misalignment and damage or unintended activation, which can be dangerous and destructive.
Innovation Solution
A powder actuated fastening tool with a rotatable ratchet and alignment member mechanism that ensures proper alignment of the powder charge strip with the barrel, using a rotatable ratchet with teeth engaging receptacles and a charge advance member coupled to the trigger to advance the strip, and an alignment member that prevents rotation when the barrel is closed, maintaining alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a powder charge strip is advanced through the tool without an alignment mechanism, then the operation is simpler, but the charge may be out of alignment with the barrel causing damage or unintended activation
Solution Approach 1:
The alignment member is positioned in advance to engage with the ratchet mechanism before the powder charge is advanced, ensuring proper alignment is established prior to the advancement operation. This preliminary positioning prevents misalignment during the charging process.
Solution Approach 2:
The alignment member acts as an intermediary element between the ratchet mechanism and the powder charge strip. It mediates the interaction by providing a reference surface that ensures the charge is correctly aligned with the barrel during advancement.
2Reliability
If the ratchet is allowed to rotate freely during barrel closing, then the mechanism is simpler, but the charge moves out of alignment with the barrel
Solution Approach 1:
The alignment member applies a preliminary counter-action to the ratchet rotation during barrel closing. By engaging with the ratchet's straight side, it prevents the ratchet from rotating in a direction that would cause misalignment, thereby maintaining charge alignment with the barrel.
Solution Approach 2:
The ratchet mechanism is designed to be dynamic, allowing rotation during charging operations but becoming constrained when the alignment member engages with the straight side during barrel closing. This dynamic behavior enables the system to adapt its degrees of freedom based on the operational phase.
3Manufacturing precision
If the alignment member engages with the ratchet during barrel closing, then alignment is maintained, but the mechanism becomes more complex
Solution Approach 1:
The ratchet is designed with asymmetric features including straight sides that engage with the alignment member. This asymmetry allows the alignment member to selectively engage with specific portions of the ratchet mechanism, providing precise alignment control without requiring a completely separate alignment system.
Solution Approach 2:
The alignment member serves multiple functions: it aligns the powder charge with the barrel, prevents ratchet rotation during closing, and works in conjunction with the existing ratchet mechanism. This multi-functionality reduces the need for additional separate alignment devices.
Data Source
AI summary
A powder actuated fastening tool including a charge advance apparatus for advancing a powder charge strip relative to a barrel of the tool, wherein the charge advance apparatus includes a rotatable ratchet having teeth for engaging receptacles formed in the powder charge strip, and a charge advance member coupled to a trigger of the tool, wherein the charge advance member acts on the rotatable ratchet to rotate the ratchet in response to actuation and/or release of the trigger, such that the rotation of the ratchet causes advance of the powder charge strip relative to the barrel.