Fastener Driver Blocking Member Prevents Unintentional Firing
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Solution Overview
Problem
Existing power-assisted fastener driving devices lack an additional safety feature that prevents unintentional firing when the work contact element is not depressed, as they often rely on mechanical linkages that can fail to block the firing mechanism effectively.
Innovation Solution
A device with a driver assembly and a work contact element that includes a blocking member, where the blocking member moves between a blocking and a pass-by position based on the work contact element's position, preventing the driver assembly from providing expulsion force when the work contact element is extended, thus ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical linkage between the work contact element and trigger is used, then the safety mechanism is integrated with trigger operation, but an additional independent safety feature is lacking
Solution Approach 1:
The safety mechanism is segmented into two independent parts: the traditional trigger-linked safety and the new blocking member safety. The blocking member operates independently from the trigger mechanism, providing a separate safety layer that prevents firing even if the trigger safety is bypassed or fails.
Solution Approach 2:
The blocking member acts as an intermediary element between the work contact element and the driver assembly. It translates the work contact element's depressed state into a physical blockage that prevents the driver assembly from operating, without requiring direct mechanical linkage to the trigger.
2Reliability
If the blocking member is positioned in the driver member's path when the work contact element is extended, then unintentional firing is prevented, but the device cannot fire when the work contact element is not depressed
Solution Approach 1:
The blocking member is designed to dynamically change position based on the work contact element's state. When the work contact element is depressed (normal operation), the blocking member moves out of the driver member's path, allowing firing. When the work contact element is extended (safety condition), the blocking member enters the path and prevents firing.
3Reliability
If traditional trigger-linked safety mechanisms are used, then trigger operation controls safety, but an additional layer of safety independent from trigger operation is lacking
Solution Approach 1:
The blocking member safety feature is extracted from the traditional trigger-linked safety system. Instead of relying solely on the trigger mechanism, the invention extracts a separate safety function that operates through the work contact element and blocking member, providing redundancy without completely redesigning the trigger system.
Data Source
AI summary
A device for driving a plurality of fasteners includes a driver assembly having a drive block, a flywheel and a driver mount. The driver mount is configured to move between a first position where the flywheel is removed from the drive block and a second position where the flywheel engages the drive block. The device also includes a work contact element configured to move between an extended position and a depressed position. A blocking arm is connected to the work contact element and configured to move with the work contact element. The blocking arm is positioned in a path of movement of the driver mount when the work contact element is in the extended position. The blocking arm is removed from the path of movement of the driver mount when the work contact element is in the depressed position.