Asymmetric Direction Indicator for Threaded Body
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Solution Overview
Problem
Existing threaded bodies, such as nuts and bolts, lack a clear visual and tactile distinction between right-handed and left-handed screws, making it difficult to determine the correct rotation direction for assembly, as the external appearance of both types is similar.
Innovation Solution
A directional indication structure is introduced, featuring an asymmetric direction indicator on the outer surface of the threaded body, comprising a facet in the form of an asymmetric triangle with distinct corners indicating the forward, reverse, and proceeding directions of rotation, allowing for visual and tactile differentiation between left-handed and right-handed screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded body has a right-handed or left-handed screw, then it can be paired with the corresponding threaded body for use, but it is impossible to distinguish between right-handed and left-handed screws based on external appearance or outer surface
Solution Approach 1:
The patent applies asymmetry by providing direction indicators with different shapes on the outer surface of the threaded body. Specifically, a first direction indicator with a first shape is provided for indicating forward rotation direction, and a second direction indicator with a second shape different from the first shape is provided for indicating reverse rotation direction. This asymmetric design allows users to visually and tactilely distinguish between right-handed and left-handed screws, resolving the contradiction between reliable pairing and difficulty of detection.
2Difficulty of detecting and measuring
If direction indicators are added to the threaded body, then visual and tactile distinction between right-handed and left-handed screws is enabled, but manufacturing complexity may increase
Solution Approach 1:
The patent merges the direction indication function with the existing outer surface structure of the threaded body. The direction indicators are integrated into the outer surface rather than being separate components, allowing visual and tactile distinction without significantly increasing manufacturing complexity. The indicators are formed as part of the threaded body structure itself, combining aesthetic appearance with functional indication.
3Ease of operation
If asymmetric direction indicators are provided on the outer surface, then ease of operation is improved by enabling correct identification of rotation direction, but manufacturing precision requirements may increase
Solution Approach 1:
The patent applies local quality by providing direction indicators at specific locations on the outer surface of the threaded body rather than requiring precision throughout the entire structure. The indicators are localized features with specific shapes (first and second shapes) that provide sufficient directional information without demanding high manufacturing precision across the whole component. This allows ease of operation to be improved while keeping manufacturing precision requirements manageable.
Data Source
AI summary
[Problem] The present invention aims to provide, without an increase in cost, a directional indication structure for threaded bodies that enables the visual and tactile distinction between left-hand thread and right-hand thread threaded bodies, enables the identification, from the external appearance and the external surface, of which direction a threaded body should be rotated in order to be tightened or loosened, enables mass production and the like, has a good external appearance, and has form properties that do not impinge the properties inherent in the threaded body or the strength, etc. thereof.[Solution] Directional indicators are asymmetrically provided, in association with the direction of rotation of the threads, to the outer surface of a solid body constituting a threaded body, said directional indicators having corner portions which indicate the forward direction in the direction of rotation, and corner portions which indicate the direction in which the threaded body will advance when rotated in the forward direction in the direction of rotation.