Compressed Air Nailer Safety Valve Assembly
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Solution Overview
Problem
Compressed air nailers using contact triggering mode pose a risk of unintentional activation, leading to potential injuries due to the need to hold the trigger pressed while positioning the device, which can result in accidental triggering by body parts or objects.
Innovation Solution
A safety valve arrangement with two control spaces and a displaceable actuating member that requires sequential and simultaneous actuation of the trigger and placing sensor to initiate a driving process, ensuring the safety valve is in an open position only when both are activated, preventing unintentional triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contact triggering mode is used to enable rapid operation, then productivity is improved, but the risk of unintentional activation increases
Solution Approach 1:
The placing sensor is activated in advance when the tool is placed on the workpiece, preparing the system for subsequent trigger activation. This preliminary action ensures that the tool is properly positioned before the driving process can be initiated, preventing unintentional activation during positioning while maintaining rapid operation capability
Solution Approach 2:
The control valve arrangement acts as an intermediary between the trigger and the driving mechanism. It requires both the placing sensor signal and the trigger signal to be present simultaneously to activate the driving process, thereby preventing unintentional activation while enabling rapid sequential operation when both conditions are met
2Ease of operation
If the trigger is held pressed down for continuous operation, then ease of operation is improved, but safety deteriorates due to accidental triggering
Solution Approach 1:
The control valve arrangement serves as a safety intermediary that requires simultaneous activation of both the placing sensor and the trigger. Even if the trigger is held pressed down, the driving process will not activate unless the placing sensor is also activated by proper placement on the workpiece, thus preventing accidental triggering while allowing continuous operation
Solution Approach 2:
The system incorporates feedback from the placing sensor to the control valve arrangement. The control valve monitors the state of both the trigger and the placing sensor, and only permits activation when both are in the correct state. This feedback mechanism ensures safety during continuous operation by preventing activation when the tool is not properly positioned
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
This solution enhances safety by ensuring that a driving process can only be triggered when both the trigger and placing sensor are actuated in a specific sequence, reducing the risk of accidental activation and enhancing operational safety.
Implementation Method 1
controlling the pressure in a first control space (60) and the pressure in a second control space (62), wherein the first control space (60) is connected to the trigger valve (22) such that an actuation of the trigger valve (22) attempts to bring the safety valve arrangement (16) into the locked position
Data Source
AI summary
A compressed air nailer comprises a working piston connected to a driving tappet configured to drive a fastener. A trigger and a placing sensor are configured to be actuated to aerate or deaerate a main control line to enable triggering of the driving process. A control valve assembly is configured to define a locked position and an open position by controlling a first pressure in a first control space and a second pressure in a second control space. The first control space is connected to the trigger valve and actuation of the trigger valve is configured to bring the safety valve assembly into the locked position. When the safety valve assembly is in the open position, an actuation of the placing sensor valve is configured to bring the safety valve assembly into the open position when the trigger valve is actuated.