Ring Bit Pulling Surface Geometry for Shorter Drilling Tools
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Solution Overview
Problem
Conventional drilling tools with ring bits require long locking elements to withstand striking and pulling forces, leading to elongated ring bits that are inefficient in design and functionality.
Innovation Solution
The ring bit is designed with a protrusion forming a ring bit pulling surface along the longitudinal axis, where the first length of the protrusion at a first surface is greater than the second length at a second surface, allowing for a shorter ring bit while maintaining strength and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If locking elements are made long to withstand striking and pulling forces, then strength and reliability are improved, but the overall length of the ring bit increases
Solution Approach 1:
The patent applies local quality by creating an asymmetric protrusion geometry where the first length (l1) at the first surface is greater than the second length (l2) at the second surface. This localized variation in dimensions allows the locking element to concentrate material where forces are applied (at the first surface facing the pulling direction) while reducing material elsewhere, thereby maintaining strength without increasing overall length
Solution Approach 2:
The patent resolves the contradiction by transitioning from a symmetric one-dimensional approach to a two-dimensional asymmetric design. The protrusion is configured with different lengths in different directions (l1 perpendicular to the longitudinal axis versus l2 parallel to it), effectively using dimensional differentiation to optimize both strength and compactness simultaneously
2Length of moving object
If ring bit length is reduced for compactness, then device complexity and material usage are improved, but locking strength may be compromised
Solution Approach 1:
The asymmetric protrusion design concentrates the locking function at the first surface where l1 provides sufficient material thickness to withstand pulling forces. The reduced l2 at the second surface eliminates unnecessary material while the critical locking region maintains adequate dimensions, achieving compactness without sacrificing locking strength
Solution Approach 2:
The patent changes the geometric parameters of the protrusion from equal dimensions (l1 = l2) to asymmetric dimensions (l1 > l2). This parameter modification allows optimization of the locking surface area at the first surface while reducing the overall protrusion volume, enabling a shorter ring bit that maintains locking capability
Data Source
AI summary
A ring bit comprises an annular or cylindrical shape. The ring bit is configured to be provided around a pilot bit at a distal end of a drilling tool concentrically with the pilot bit. The ring bit comprises at least one protrusion protruding inwards from a first surface provided inside the ring bit, and at least one ring bit pulling surface, which ring bit pulling surface is formed in the protrusion and formed in relation to a radial direction of the ring bit in a direction of a longitudinal axis of the drilling tool in such a manner that a first length of the protrusion at the first surface in the direction of the longitudinal axis is greater than a second length of the protrusion at a second surface. The second surface is defined by the inner-most surface of the protrusion and the first surface is provided at the base of the protrusion on the pulling surface side of the protrusion.