Spanner Bending Section Teeth Ratio for Deep Recessed Screw Access
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Solution Overview
Problem
Conventional spanners with bending sections struggle to insert the driving portion deeply into recessed screws due to their design, leading to inadequate nut engagement and potential damage to the engaging head under prolonged use.
Innovation Solution
A spanner with a bending section featuring a handle, a driving portion connected via a bending connecting portion, and an engaging head with teeth where the length of the teeth is longer than the width of the engaging end, maintaining a ratio of 2:1 to 3:1, providing a firm structure for deep insertion and reduced deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the engaging head is made longer to insert deeply into recessed screws, then the insertion depth is improved, but the engaging head may deform or damage under prolonged use
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio between the length of the teeth (L) and the width of the engaging end (W), setting L/W to be between 2 to 3 (preferably 2.5). This specific dimensional relationship allows the engaging head to achieve sufficient insertion depth while maintaining structural integrity and resisting deformation under prolonged use.
2Ease of operation
If the engaging head is made longer to drive nuts, then the driving capability is improved, but the engaging head will deform or damage under prolonged use
Solution Approach 1:
The patent optimizes the geometric parameters of the engaging head, specifically the ratio L/W between tooth length and engaging end width, to fall within the range of 2 to 3. This parameter optimization enables the engaging head to achieve adequate driving capability for nuts while preventing deformation and extending product lifetime under prolonged use.
3Ease of operation
If the driving portion is inserted deeply into recessed screws, then the nut engagement is improved, but the general spanner design is not suitable for this purpose
Solution Approach 1:
The patent applies local quality by designing the engaging head with specific local characteristics - the teeth have a length-to-width ratio (L/W) between 2 to 3, which provides enhanced engagement capability for recessed screws and nuts. This localized geometric optimization enables the spanner to handle fastening operations in deep recesses while maintaining overall spanner functionality.
Data Source
AI summary
A spanner with a bending section comprises a handle and a driving portion; and a bending connecting portion connected between the handle and the driving portion; the driving portion being installed with an engaging head; a front end of the engaging head having an engaging end; a periphery of the engaging head having a plurality of teeth for engaging the driving portion; a length L of each teeth being longer than a width W of the engaging end. The ratio of L/W is from 2 to 3. Preferably, the ratio is 2.5.