Impact Driver Sleeve and Chuck Mechanism for Downward Force
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Solution Overview
Problem
Current impact drivers, both manual and motorized, fail to precisely drive screws into a desired position and direction, particularly when dealing with stubborn fasteners, as they do not effectively deliver downward force.
Innovation Solution
The impact driver design includes a sleeve with a bore and a striking unit, featuring a guiding element, hammer, pusher, and a chuck with a ring, tube, spring, and balls, which allows for precise alignment and downward force application through a combination of mechanical and spring-loaded mechanisms to drive screws into materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motor is used to automatically deliver rotational forces, then speed and operator fatigue are improved, but downward force is lost
Solution Approach 1:
The patent combines the advantages of both manual and motorized impact drivers by integrating a motor-driven rotation mechanism with a manual striking mechanism. The housing can be rotated automatically by a motor while simultaneously being struck manually to deliver downward force, merging automated speed with manual force delivery capability
Solution Approach 2:
The impact driver is designed to perform multiple functions: it can rotate automatically via motor for high-speed applications, accept manual striking for downward force delivery, and combine both modes simultaneously. This multi-functionality allows the tool to adapt to different fastening scenarios requiring different force characteristics
2Force
If manual striking is used to deliver downward force, then downward force is improved, but speed is reduced
Solution Approach 1:
The patent merges manual striking capability with automated rotation by providing both a striking surface for manual impact delivery and a motor-driven rotation mechanism. Users can strike the housing manually to deliver downward force while the motor simultaneously rotates the housing, combining the benefits of both approaches
Solution Approach 2:
The housing is designed with dynamic characteristics that allow it to respond differently to different inputs: it can be rotated automatically by motor power for speed, or struck manually for force delivery. The housing's mass and geometry are optimized to translate both rotational motion and impact forces effectively to the fastener
3Force
If torque is prioritized for driving screws, then torque is improved, but precision in position and direction is lost
Solution Approach 1:
The housing acts as an intermediary element that receives both rotational motion from the motor and impact forces from manual striking, then transmits these forces through the bit to the fastener. This intermediary structure allows precise control of both torque and directional forces, ensuring the screw is driven precisely in the desired position and direction while maintaining adequate torque
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
This design enables precise driving of screws into a desired position and direction, ensuring the screw axis is perpendicular to the material surface, effectively addressing the limitations of existing impact drivers by delivering controlled downward force.
Implementation Method 1
The spring is compressed between the annular rib and the sleeve. The ball includes a portion placed in the aperture and another portion movable into the polygonal bore.
Implementation Method 2
The striking unit can strike a bit partially inserted in the sleeve through the open end
Implementation Method 3
The tube includes a polygonal section movably inserted in the polygonal section of the bore of the sleeve
Data Source
AI summary
An impact driver includes a sleeve, a striking unit and a chuck. The sleeve includes a bore with an open end and a polygonal section near the open end. The striking unit can strike a bit partially inserted in the sleeve through the open end. The chuck includes a ring, a tube, a spring and a ball. The tube includes a polygonal section movably inserted in the polygonal section of the bore of the sleeve, a circular section extended through the ring, an annular rib formed thereon, a polygonal bore for receiving the bit, and at least one aperture in communication with the polygonal bore. The spring is compressed between the annular rib and the sleeve. The ball includes a portion placed in the aperture and another portion movable into the polygonal bore.