Driving Head-Changeable Tool With Arc Surface Ribs
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Solution Overview
Problem
Existing driving head tools with polygonal ball heads and receiving slots suffer from high friction, leading to sticking issues during high-speed rotation, security problems, and the need for multiple tools for different applications, which reduces efficiency and increases costs.
Innovation Solution
A driving head-changeable tool and sleeve assembly featuring a connecting sleeve with axial protruding ribs and recesses, an outer sleeve for telescopic movement, and limitation members that allow easy head replacement and reduce friction through arc surfaces and stepped portions, enabling smooth rotation and swapping of driving heads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a polygonal ball head is received in a polygonal receiving slot with surface contact, then the connecting structure is simple, but friction is large causing sticking during high-speed rotation
Solution Approach 1:
The patent applies curvature by forming arc surfaces on the protruding ribs of the connecting sleeve and corresponding arc surfaces on the polygonal ball head. These curved surfaces replace the traditional flat polygonal contact surfaces, enabling point or line contact instead of surface contact. This curvature design significantly reduces friction during rotation, preventing sticking while maintaining structural simplicity.
2Reliability
If flanges are added to stop corner portions of the polygonal ball head, then security is improved, but device complexity increases
Solution Approach 1:
The patent merges the limiting function into the existing protruding ribs by forming arc surfaces on them. Instead of adding separate flanges to stop corner portions, the curved surfaces on the protruding ribs themselves provide the limiting action. This integration achieves the security function without increasing device complexity, as the same structural elements serve dual purposes: reducing friction through curvature and limiting motion through their geometric configuration.
3Device complexity
If a fixed driving head is used, then the tool structure is simple, but adaptability is reduced requiring multiple tools
Solution Approach 1:
The patent implements a dynamic, changeable driving head system where the driving head can be selectively installed and removed from the connecting sleeve. The protruding ribs with arc surfaces interact with corresponding features on different driving heads, allowing rapid replacement to adapt to different working requirements. This dynamic configuration enables one tool to perform multiple functions without significantly increasing overall structure complexity.
4Productivity
If high-speed rotation is enabled, then productivity is improved, but friction causes energy loss and sticking
Solution Approach 1:
The arc surfaces formed on the protruding ribs and corresponding polygonal ball head surfaces enable high-speed rotation by reducing friction from surface contact to point or line contact. This curvature design minimizes energy loss due to friction, allowing the tool to operate at high speeds efficiently without sticking, thereby improving productivity while reducing energy consumption.
Data Source
AI summary
A driving tool is provided, including a tool set and a driving head. The tool set includes a connecting sleeve, an outer sleeve and at least one limitation member. The connecting sleeve has a receiving slot and a driving end. A plurality of protruding ribs extending axially and a plurality of recesses disposed between the protruding ribs are disposed on an inner wall of the receiving slot. The recesses are provided for a polygonal ball head to insert therein. A recessed portion and a protruding portion are disposed on the inner wall. The outer sleeve is slidable between a first position and a second position. When the outer sleeve is at the first position, the limitation member can restrict the polygonal ball head. When the outer sleeve is at the second position, the polygonal ball head is withdrawable from the receiving slot.