Dry Fire Lockout Link for Nail Gun Safety Trip
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Solution Overview
Problem
Existing fastener driving devices, such as pneumatic nail guns, risk damaging the contact safety trip when accidentally dropped due to the dry fire lockout mechanism preventing movement, which can lead to undesirable driver marks on workpieces during actuation without fasteners.
Innovation Solution
A dry fire lockout mechanism that allows the contact safety trip to move when the device is dropped, incorporating a link and biasing member that disengages when the fastener supply is low, preventing accidental actuation and protecting the contact safety trip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dry fire lockout mechanism is activated to prevent accidental actuation, then operational safety is improved, but the contact safety trip becomes vulnerable to damage during drops
Solution Approach 1:
The contact safety trip is divided into two functional segments: the lower contact arm that remains locked in the dry fire lockout position to prevent accidental actuation, and the upper contact arm that can move independently to absorb impact during drops. This segmentation allows each part to perform its specific function without compromising the other.
Solution Approach 2:
The link acts as an intermediary element between the lower contact arm and the upper contact arm. It transmits the locking action from the lower contact arm to the upper contact arm during normal operation, but allows the upper contact arm to move independently during drops, thereby protecting the contact safety trip while maintaining operational safety.
2Reliability
If the contact safety trip is locked in place during dry fire lockout, then accidental actuation is prevented, but the device becomes more vulnerable to damage during drops
Solution Approach 1:
The contact safety trip transitions from a static locked position to a dynamic system where the upper contact arm can move independently. The link maintains the locking function during normal operation but allows controlled movement during drops, providing both prevention of accidental actuation and resistance to damage.
Solution Approach 2:
The upper contact arm is positioned and configured to act as a cushioning element before damage can occur. During drops, it moves independently to absorb impact forces, protecting the lower contact arm and the trigger mechanism from damage while maintaining the dry fire lockout function.
3Reliability
If the dry fire lockout portion of the lifter engages the link, then fastener supply monitoring is improved, but the link cannot move to bypass the lockout
Solution Approach 1:
The link is designed with dynamic movement capability. When the dry fire lockout portion of the lifter engages the link, the link can still move against the bias of the biasing member to a second orientation. This dynamic behavior allows the system to maintain fastener supply monitoring while providing bypass capability in case of drops or abnormal conditions.
Solution Approach 2:
The link's position changes between a first orientation (interconnected with the lower contact arm) and a second orientation (not interconnected). This parameter change allows the system to transition between locked and bypassed states, providing both reliable fastener supply monitoring and adaptability for abnormal conditions.
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 mechanism effectively prevents accidental actuation of the fastener driving device while allowing the contact safety trip to move, reducing the risk of damage during drops and maintaining operational safety.
Implementation Method 1
a biasing member positioned between the link and the upper contact arm. The biasing member is configured to bias the link in the first orientation so that the link is interconnected with the lower contact arm
Implementation Method 2
The dry fire lockout portion of the lifter is configured to engage the dry fire lockout portion of the link, when the supply of fasteners is less than a predetermined number of fasteners, and move the link against the bias of the biasing member to a second orientation
Data Source
AI summary
A dry fire lockout assembly for a fastener driving device includes a bypass feature. A link is movably mounted to an upper contact arm and interconnected with a lower contact arm when the link is in a first orientation. The link includes a dry fire lockout portion. A dry fire lockout portion of a lifter is configured to engage the dry fire lockout portion of the link, when a supply of fasteners in the fastener driving device is less than a predetermined number of fasteners, and move the link against the bias of the biasing member to a second orientation in which the link is not interconnected with the lower contact arm.