Work-Tool Mounting Mechanism Lock Pin Ejection Prevention
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Solution Overview
Problem
Conventional work-tool mounting mechanisms face issues with lock pins falling out of engaging-hole portions due to external forces, particularly when the connecting shafts are not securely locked, leading to potential detachment of work tools during operation.
Innovation Solution
A work-tool mounting mechanism featuring a link portion with a regulating portion that prevents the lock pin from falling out by using a rotatable lever and adjustable link components, including a first part and a second part with distinct diameters, where the second part's enlarged diameter prevents insertion into the first part's hole, ensuring the lock pin remains locked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lock pin is made movable to allow detachment of work tools, then the ease of operation is improved, but the reliability deteriorates because the lock pin may fall out of the engaging-hole portion due to external forces
Solution Approach 1:
The patent introduces a regulating portion as an intermediary component between the lock pin and the external environment. This regulating portion restricts the movement range of the lock pin, allowing it to move between locked and unlocked positions while preventing it from falling out due to external forces. The intermediary structure mediates between the need for movability and the need for security.
Solution Approach 2:
The lock pin is designed to be movable rather than fixed, allowing dynamic transition between locked and unlocked states. The regulating portion provides dynamic constraint, permitting movement within a controlled range while preventing movement beyond safe limits. This dynamic design enables both secure locking and easy detachment when needed.
2Manufacturing precision
If the link portion is made rigid to ensure precise locking, then the manufacturing precision is improved, but the ease of operation deteriorates because play is needed in the operation of the link portion
Solution Approach 1:
The link portion is designed with different local qualities: the connection points (first part and second part) have precise fitting characteristics for secure engagement, while the intermediate section allows for controlled play. This local differentiation enables precise locking at critical interfaces while maintaining operational flexibility in the linkage mechanism.
Data Source
AI summary
A work-tool mounting mechanism detachably attaches a predetermined work tool that includes an engaged portion including an engagement hole. The mechanism includes: an engaging portion that engages the engaged portion and includes; a lever that is rotatably attached to the engaging portion; a lock pin that is movable between a locked position and an unlocked position, the lock pin being inserted into the engagement hole in the locked position, and not inserted into the engagement hole in the unlocked position; and a linking tool that moves the lock pin between the locked position and the unlocked position with a rotation of the lever. The linking tool includes a regulating portion that regulates the lock pin at the locked position from moving to the unlocked position.