Bolt Coupling Recess Openings for Fastening State Detection
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Solution Overview
Problem
Conventional bolts have issues with a thick threaded part due to the need for a deep tool coupling recess, which limits the height of the head part and makes it difficult to detect the fastening state, and are prone to loosening under vibration or shock due to the head part not being securely fixed.
Innovation Solution
A bolt design with openings in the coupling recess that expose tool portions, allowing for a lower head part height without a thick threaded part, enabling detection of the fastening state and preventing loosening through anti-loosening protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tool is completely accommodated in the tool coupling recess, then stable coupling is achieved, but the fastening state cannot be detected
Solution Approach 1:
The head part is designed with selective transparency through openings in specific locations. These openings allow local visibility of the tool and fastening state while maintaining overall coupling stability. The local quality change (transparent openings in specific areas) enables detection without compromising the recess's ability to accommodate and stabilize the tool.
2Length of stationary object
If the head part is made compact, then overall bolt size is reduced, but the head part cannot be fixed to prevent loosening under vibration
Solution Approach 1:
The coupling recess is divided into multiple sections with openings, allowing the head part to maintain compact dimensions while incorporating anti-loosening features. The segmented design enables the head to be fixed to the structure through the threaded part extending into the workpiece, preventing loosening under vibration while keeping the head part height reduced.
Data Source
AI summary
Disclosed herein is a bolt provided with openings. The bolt includes a head part and a threaded part, and is fastened to a structure through the threaded part while being rotated by a tool. The bolt further includes: a coupling recess formed in the head part or the threaded part while forming a recess shape having a cross section corresponding to that of the tool, and configured to allow the tool to be coupled thereto; and one or more openings formed in portions of the coupling recess in hole shapes, and configured to expose at least portions of the tool, coupled to the coupling recess, out of the head part or the threaded part.