Hook Spanner Oblique Abutting Surface for Nut Groove Engagement
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Solution Overview
Problem
Conventional hook spanners fail to stably turn nuts with inclined groove surfaces due to linear contact, leading to disengagement during turning.
Innovation Solution
A hook spanner with a hook protrusion featuring an obliquely extending abutting end surface that aligns with the inclined groove surface of the nut, ensuring surface contact and stable engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the abutting end surface is a vertical flat surface, then the structure is simple, but it cannot extend along the inclined groove surface and only contacts in linear contact
Solution Approach 1:
The abutting end surface changes from a vertical orientation to an inclined orientation that matches the groove surface angle. This parameter change allows the spanner to extend along the inclined groove surface, transforming linear contact into surface contact and significantly improving engagement stability while maintaining manufacturing simplicity
Solution Approach 2:
The contact interface transitions from one-dimensional linear contact to two-dimensional surface contact by aligning the abutting end surface with the inclined groove surface. This dimensional change increases the contact area and enhances the reliability of the engagement
2Area of stationary object
If the abutting end surface is a vertical arced convex surface, then the structure provides some contact area, but it still cannot extend along the inclined groove surface and contacts in linear contact
Solution Approach 1:
The orientation parameter of the abutting end surface is changed from vertical to inclined, matching the groove surface angle. This allows the spanner to extend along the inclined groove surface, transforming linear contact into surface contact and significantly improving engagement stability
3Device complexity
If linear contact is used between the abutting end surface and inclined groove surface, then the structure is simple, but the spanner cannot stably turn the nut and is easily disengaged
Solution Approach 1:
The abutting end surface is inclined to match the groove surface angle, transforming the contact mode from linear to surface contact. This parameter change maintains structural simplicity while dramatically improving turning stability and preventing disengagement
Solution Approach 2:
The contact interface expands from one-dimensional linear contact to two-dimensional surface contact by aligning the inclined abutting end surface with the inclined groove surface, increasing contact area and improving turning stability
Data Source
AI summary
A hook spanner has a spanner body having two opposite side surfaces, a handle segment, and a hooking segment formed on an end of the handle segment. The hooking segment has an abutting end surface located away from the handle segment and having an abutting end surface extending obliquely from one of the two opposite side surfaces of the spanner body to the other side surface. The hook spanner is adapted to turn a nut having multiple grooves arranged around the nut. Each groove has an inclined surface extending obliquely and inwardly from a peripheral surface of the nut. The abutting end surface is aligned with the inclined groove surface of one of the grooves of the nut to stably turn the nut.