Fastener Setting Device Linear Actuation Bolt
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Solution Overview
Problem
Existing devices for setting fastening elements require significant effort to move the bolt between advanced and retracted positions, which is inefficient.
Innovation Solution
The device allows the actuating member to be moved in an axially aligned lifting direction to transition between retracted and advanced positions, utilizing a locking arrangement with bolt holding pawls and unlocking pins to facilitate easy displacement of the bolt, reducing the required effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional locking arrangement with rotational actuating element is used, then the bolt can be secured in retracted position, but significant effort is required to move the bolt between advanced and retracted positions
Solution Approach 1:
The patent replaces the traditional rotational actuating mechanism with a linear actuating member that moves axially. This substitution changes the mechanical principle from rotational motion to linear motion, enabling the bolt to be moved between positions with less effort while maintaining secure engagement through the pawl-and-rack locking mechanism that engages during the linear stroke
Solution Approach 2:
The actuating member is designed to move dynamically between extended and retracted positions along the axial direction. The locking arrangement transitions from engaged to disengaged state during this dynamic movement, allowing the bolt to be easily positioned and securely locked. The system adapts its state based on the position of the actuating member, providing ease of operation during transition and reliability when locked
2Ease of operation
If the actuating member moves in axial lifting direction, then effortless movement between positions is achieved, but the device complexity increases due to additional locking components
Solution Approach 1:
The patent combines multiple functions into integrated components. The actuating member serves both as the operational interface for moving the bolt and as part of the locking mechanism itself. The pawls are integrated into the bearing sleeve structure, and the rack teeth are formed on the actuating member, merging the actuation and locking functions into a unified system that achieves effortless operation without excessive complexity
3Reliability
If pawls are biased radially inward, then secure locking of bolt is achieved, but the force required to overcome the bias during actuation increases
Solution Approach 1:
The patent introduces the rack teeth as an intermediary mechanism between the actuating member and the pawls. As the actuating member moves linearly, the rack teeth engage the pawls and progressively lift them against their radial inward bias. This intermediary rack mechanism distributes the force requirement throughout the stroke and provides mechanical advantage, allowing secure locking through strong pawl bias while keeping the actuation force manageable through the gradual engagement of the rack teeth
Data Source
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AI summary
The invention relates to a device for setting a fastener element (55) having an inner pin (56) slidable relative to an outer body (57) and comprising a locking arrangement (32, 33; 38, 39) comprising a bolt (19) provided for acting on the inner pin (56) and secured in a retracted position against axial displacement into an advanced position after relatively spacing a handle body (52) and an actuating organ (8, 46). When the actuating organ (8, 46) is actuated by a displacement opposite the retraction direction, an unlatching organ (40, 41) acts on the locking arrangement (32, 33; 38, 39) and releases the bolt (19) for displacing into the advanced position. Very simple handling of the manually actuated device is thus ensured.