Power Drill Chuck with Automatic Jaw Adjustment for Faster Bit Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional chucks require numerous turns to adjust the jaw opening for different-sized working bits, leading to inefficiencies and excessive downtime when changing bits, especially in high-throughput environments.
Innovation Solution
A chuck design featuring a jaw spring that automatically adjusts the jaws and a clamping assembly allowing for quick and secure engagement of working bits, utilizing a push plate and nut with helically threaded coupling to translate the jaws into a closed position with minimal turns of the sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional chucks use moveable jaws adjusted by rotating an external sleeve, then the jaw opening can be changed to receive various working bits, but numerous turns of the sleeve are required leading to excessive downtime and inefficiency
Solution Approach 1:
The jaw spring is pre-loaded in the compressed state during assembly, storing elastic potential energy that automatically urges the push plate forward to close the jaws when the nut is rotated. This preliminary preparation of the spring eliminates the need for multiple manual turns to close the jaws, reducing bit changing time while maintaining adaptability.
Solution Approach 2:
The jaw spring automatically performs the work of closing the jaws by converting its stored elastic energy into forward motion of the push plate. This self-service mechanism eliminates the need for manual operation to close the jaws, significantly reducing the time required for bit changes while preserving the ability to adjust to various bit sizes.
2Speed
If the jaw spring applies continuous forward force to automatically close the jaws, then bit changing speed is improved, but the jaws may not maintain secure clamping pressure on the working bit
Solution Approach 1:
The helically threaded coupling converts rotational motion of the nut into periodic linear advancement, creating a ratcheting effect where the jaws advance in discrete steps toward the working bit. This periodic action allows the spring force to be applied intermittently rather than continuously, maintaining secure clamping pressure while enabling rapid closure.
Solution Approach 2:
The helically threaded coupling replaces a purely spring-based mechanical system with a combined screw-mechanism that converts rotational input into controlled linear advancement. This substitution provides both the speed advantage of spring force and the reliability of positive mechanical engagement through the threaded coupling.
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 and secure adjustment and clamping of working bits, reducing downtime and improving efficiency by allowing automatic jaw adjustment and secure clamping with fewer turns of the sleeve.
Implementation Method 1
a jaw spring configured to apply a forward directed force to urge the push plate forward
Implementation Method 2
a nut with helically threaded coupling configured to translate the jaws into a closed position
Data Source
AI summary
Various chucks for use with a power driver having a rotatable drive spindle are provided. One chuck includes a plurality of jaws disposed at a forward end of the chuck, a body, a push plate, a jaw spring, and a nut. The plurality of jaws may be disposed in the body and configured to rotate with the body about a center axis of the chuck. The push plate may be operably coupled to each of the jaws. The jaws may be configured to translate forward to close the jaw opening in response to the push plate translating axially forward. The jaw spring may be configured to apply a forward directed force to urge the push plate forward. The nut may have nut teeth that cause the jaws to translate forward and clamp onto the working bit in response to the nut being rotated in a tightening direction.