Bolt Tightening Fixture With Magnetic Hold and Cam Release
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Solution Overview
Problem
Existing tightening devices face challenges in accurately capturing changes in the contact state between a bolt and a work piece due to gaps between the socket and bolt, making it difficult to perform reliable fastening.
Innovation Solution
A tightening device with a holding member and fixing members that maintain a fixed state before tightening, allowing for accurate detection of contact state changes and subsequent reliable fastening, where the fixed state is released after the tightening process begins, utilizing a single power source for rotational power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is arranged between the socket and the bolt to allow position shift during tightening, then the tightening process becomes more flexible and reliable, but the ability to accurately detect changes in contact state deteriorates
Solution Approach 1:
The device is segmented into two functional states: a held state for accurate detection and a fixed state for reliable tightening. The holding member and fixing members create distinct operational phases that separate the detection function from the tightening function, allowing each to optimize for its specific purpose without interference from the other state
Solution Approach 2:
The device dynamically transitions between the held state and the fixed state during operation. The holding member maintains the bolt in a detectable position initially, then the fixing members engage to lock the position for reliable tightening. This dynamic state change allows the system to adapt its characteristics based on the operational phase
2Measurement precision
If the fixed state is maintained before tightening work, then contact state detection precision improves, but the ability of the bolt to follow the work piece during tightening deteriorates
Solution Approach 1:
The holding member performs preliminary action by maintaining the bolt in a fixed held state before tightening begins. This preliminary fixation enables accurate detection of contact state changes. After detection is complete, the fixing members release to allow the bolt to adapt to the work piece during the actual tightening process
Solution Approach 2:
The device employs periodic action by alternating between the held state for detection and the fixed state for tightening. The holding member engages initially for detection, then the fixing members take over for tightening. This periodic switching between states allows the system to achieve both detection precision and tightening reliability
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
Enables accurate detection of contact state changes and reliable fastening by maintaining a fixed state before tightening and releasing it during the process, ensuring the bolt follows the work piece for proper tightening without requiring a separate power source.
Implementation Method 1
the member to be tightened is temporarily held on a tightening device such as a socket or the like that is held by an end effector or the like by a magnetic force of a magnet or the like
Data Source
AI summary
Provided is a tightening device capable of capturing a change in a contact state of a member to be tightened, such as a bolt or the like, and also performing fastening. The tightening device tightens a bolt to a work piece in a state where a main body is engaged with the bolt, and includes: a magnet that holds the bolt with respect to the main body; and at least one lower cam member that enables fixation in a fixed state where a binding force on the bolt is larger than a holding force of holding the bolt by the magnet. The at least one lower cam member is capable of maintaining the fixed state before a tightening work of tightening the bolt to the work piece is performed and releasing the fixed state after the tightening work is started.