Multi-Mode Chuck Jaw Movement for Fast Adjustment and Secure Clamping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional chucks require numerous turns to adjust jaw openings, leading to inefficiencies and increased downtime due to the linear relationship between sleeve rotation and jaw translation, and increasing the slope of helical threading to enhance jaw opening diameter change results in reduced frictional forces, risking nut slippage and unintended loosening.
Innovation Solution
A chuck design that transitions between rapid jaw adjustment and clamping modes, utilizing a helically threaded coupling with a high slope for rapid diameter changes and a clamping assembly for secure tightening, ensuring high jaw opening diameter change to sleeve turn ratio without slipping or inability to tighten, by using a clamping member and clutch to manage torque and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slope of helical threading is increased to enhance jaw opening diameter change, then the jaw opening diameter change to sleeve turn ratio is improved, but frictional forces are reduced causing nut slippage and unintended loosening
Solution Approach 1:
The system dynamically transitions between two operational modes: rapid adjustment mode where the nut rotates freely with high-slope threading for fast jaw opening changes, and clamping mode where the clamping assembly engages to prevent nut rotation and enable secure tightening. This dynamic mode switching resolves the contradiction by allowing high productivity in adjustment while ensuring reliability in clamping
Solution Approach 2:
The effective threading slope parameter is changed based on operational needs. During rapid adjustment, the high-slope threading is engaged for maximum jaw opening change per sleeve turn. During clamping, the system switches to a different mechanical advantage configuration through the clamping assembly, effectively changing the parameter to prioritize friction and prevent slippage
2Device complexity
If conventional linear threaded coupling is used, then the structure is simple, but numerous sleeve turns are required leading to excessive downtime
Solution Approach 1:
The system transitions from a static single-mode threaded coupling to a dynamic multi-mode system. The clamping assembly introduces a movable element that can engage or disengage based on operational phase, enabling rapid adjustment mode with reduced sleeve turns while maintaining structural simplicity through modular design
Solution Approach 2:
The threaded coupling system is segmented into two functional pathways: one for rapid adjustment with high-slope threading and minimal sleeve turns, and another for secure clamping through the clamping assembly. This segmentation allows the system to optimize for speed during adjustment while maintaining simplicity in each individual component
3Reliability
If the nut is rotationally fixed with the jaws in clamping mode, then secure clamping is achieved, but the sleeve can no longer rotate the nut for adjustment
Solution Approach 1:
The system uses dynamic mode switching where the clamping assembly acts as a gatekeeper. When disengaged, the nut is free to rotate for adjustment. When engaged, the nut is rotationally fixed for secure clamping. The operator controls the transition between these states, ensuring both adjustment capability and clamping security are available when needed
Solution Approach 2:
The clamping assembly serves as an intermediary mechanism between the sleeve and the nut. It mediates the rotational connection, allowing it to be flexible during adjustment and rigid during clamping. This intermediary enables the system to achieve both ease of operation and reliability without direct conflict
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
Enables rapid jaw adjustments with a high jaw opening diameter change to sleeve turn ratio while ensuring secure clamping without slipping or loosening, by decoupling the nut's rotational movement in clamping mode and using a clamping assembly to generate sufficient friction for tightening.
Implementation Method 1
The nut teeth may be operably coupled with at least some of the jaw teeth in a helically threaded coupling. In the rapid jaw adjustment mode, the sleeve may be configured to rotate the clamping member with the nut to cause rotational movement of the nut relative to the jaws and the body, which may cause translational movement of the jaws relative to the body.
Implementation Method 2
ensuring high jaw opening diameter change to sleeve turn ratio without slipping or inability to tighten, by using a clamping member and clutch to manage torque and friction.
Data Source
AI summary
A chuck for use with a power driver having a rotatable drive spindle is provided. The chuck may include a clamping assembly comprising a clamping member that operably couples the sleeve to a nut. The clamping assembly may be configured to transition the chuck between a rapid jaw adjustment mode and a clamping mode. In the rapid jaw adjustment mode, a sleeve may be configured to rotate the clamping member with the nut to cause rotational movement of the nut relative to jaws and a chuck body, which may cause translational movement of the jaws relative to the chuck body. In the clamping mode, the nut may be rotationally fixed with the jaws and the clamping member may rotate relative to the nut to cause the nut to move axially relative to a center axis of the chuck which causes the jaws to translate relative to the body and clamp onto a working bit.