Hand-Tight Drill Chuck Self-Locking Structure for Consistent Torque
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Solution Overview
Problem
The existing hand-tight drill chuck locking structures suffer from low locking and unlocking torque, deformation of elastic components, wear of plastic parts, and a short service life due to hanging teeth and inadequate locking mechanisms.
Innovation Solution
A hand-tight drill chuck with a self-locking structure featuring a ring member with internal threads, an elastic piece with an arcuate portion, and a metal member with a control structure that engages through grooves and protrusions to maintain a self-locking state without slack, ensuring high locking and unlocking torque while preventing wear and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional locking structure with elastic piece and pawl is used, then the drill chuck can maintain a locked state, but the locking torque is small and the service life is short due to easy deformation and wear
Solution Approach 1:
The locking structure is divided into separate functional components: the elastic piece provides positioning through its arcuate portion, while the metal member with elastic portion provides the locking engagement through groove-protrusion interaction. This segmentation allows each component to be optimized for its specific function, improving overall reliability and service life.
Solution Approach 2:
The invention combines different materials with complementary properties: the elastic piece (likely polymer or elastomer) provides flexibility and positioning, while the metal member provides structural strength and durable locking engagement. This composite approach resolves the contradiction between maintaining locking torque and extending service life.
2Device complexity
If the elastic piece is placed inside the nut sleeve, then the locking structure is compact, but the elastic piece is easily deformed under stress
Solution Approach 1:
The metal member acts as an intermediary between the elastic piece and the ring of teeth. The elastic piece engages with the metal member's groove-protrusion features rather than directly with rigid structures, distributing stress more evenly and reducing localized deformation while maintaining structural integrity.
3Ease of manufacture
If a plastic front sleeve is used, then the structure is lightweight and easy to manufacture, but it is easy to wear and has short service life
Solution Approach 1:
Different parts of the drill chuck use different materials optimized for their specific functional requirements: the metal member and ring of teeth use wear-resistant materials for locking engagement, while other non-critical components may use lighter materials. This local optimization resolves the contradiction between ease of manufacture and wear resistance.
4Ease of operation
If the groove or protrusion of the elastic piece is positioned away from the middle of the arcuate portion, then the locking mechanism can engage, but the elastic piece experiences uneven stress distribution leading to deformation
Solution Approach 1:
The groove or protrusion on the elastic piece is pre-positioned at the middle of the arcuate portion during manufacturing. This preliminary positioning ensures that when the elastic piece deforms during locking engagement, the stress is distributed evenly throughout the arcuate portion, preventing localized deformation and extending the component's service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced locking performance, extended service life, and prevents wear on internal surfaces by utilizing an elastic match between the arcuate portion and metal member, eliminating hanging teeth and ensuring consistent torque.
Implementation Method 1
an elastic piece having an arcuate portion... the elastic piece is provided with a lock portion and a groove or a protrusion that cooperate with a ring of the teeth... when the groove or the protrusion of the elastic piece tightly withstands against and is engaged with the protrusion or the groove of the metal member by elasticity
Data Source
AI summary
A hand-tight drill chuck with a lock and self-locking structure including an elastic piece with an arcuate portion, arranged on a ring member threadedly connected to a clamping claw. The two ends of the arcuate portion are restricted. The elastic piece has a locking portion and groove or protrusion that cooperate with teeth between two ends of the arcuate portion. The drill chuck has a rotation sleeve with control structure. The control structure includes a metal member with elastic portion having a protrusion or groove that cooperate with the groove or protrusion. When the groove or protrusion of the elastic piece withstands against and is engaged with the protrusion or groove of the metal member via elasticity, the drill chuck is in a self-locking state. This ensures a locking torque and unlocking torque by elastic match between an elastic force which is not slack.