Power Wrench Through-Hole Spindle for Long Bolt Tightening
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Solution Overview
Problem
Conventional power wrenches are limited in their ability to continuously rotate and tighten long bolts due to the bolt abutting the closed end of a blind hole, requiring manual operation and consuming time and labor.
Innovation Solution
A power wrench design featuring a motor, drive unit, and housing unit with a rotatable output spindle and socket members that allow for the passage of long bolts, enabling continuous rotation and tightening of nuts or screws through a gear set and flywheel mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a blind hole with a single opening is used in the power wrench, then the structure is simple and compact, but long bolts cannot pass through completely and require manual operation to finish tightening
Solution Approach 1:
The blind hole is segmented into two separate openings located at opposite ends of the housing, allowing the bolt to pass completely through the power wrench mechanism. This segmentation enables the bolt to be fully inserted and tightened automatically without manual intervention, resolving the contradiction between structural simplicity and tightening efficiency.
Solution Approach 2:
The single blind hole opening is transformed into a through-hole configuration with openings at both ends of the housing structure. This dimensional change from a closed blind hole to an open through-hole allows complete bolt passage while maintaining the compact housing design, thereby improving productivity without significantly increasing complexity.
2Productivity
If the power wrench is designed with a through-hole for complete bolt passage, then continuous rotation and automatic tightening is enabled, but the housing structure becomes more complex
Solution Approach 1:
The housing is segmented to include two opposite openings that form a through-hole path. This segmentation allows the bolt to pass completely through while the housing itself remains a simple enclosures structure, minimizing the increase in overall device complexity while achieving continuous rotation capability.
Solution Approach 2:
The housing unit serves multiple functions: it encloses the motor and drive mechanisms, provides structural support, and creates the through-hole passage for bolt insertion. By integrating the passage function into the housing structure itself rather than adding separate components, the design achieves automatic tightening capability with minimal increase in device complexity.
3Device complexity
If the output spindle has a closed end like conventional designs, then the structure is compact, but the bolt cannot pass through completely requiring manual operation
Solution Approach 1:
The output spindle is redesigned with openings at both ends instead of a closed blind hole structure. This segmentation creates a continuous passage that allows the bolt to pass completely through the output unit, enabling automatic tightening without manual intervention while maintaining a relatively simple spindle structure.
Solution Approach 2:
Instead of having a closed blind hole at the end of the output spindle as in conventional designs, the design inverts the structure to create an open through-hole configuration. This inversion allows the bolt to pass completely through the output unit, transforming the operation from manual to automatic while keeping the output unit structure simple.
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 efficient and labor-saving operation for various bolt lengths by allowing continuous rotation and tightening of fasteners, enhancing convenience and application range with interchangeable socket members.
Implementation Method 1
The motor has a motor shaft
Implementation Method 2
The drive unit is connected to the motor and includes a gear set driven by the motor shaft
Implementation Method 3
enabling continuous rotation and tightening of fasteners, enhancing convenience and application range with interchangeable socket members
Data Source
AI summary
A power wrench includes an output spindle and a socket member. The output spindle has an axial through hole that extends through the output spindle and that open at two axially opposite ends of the output spindle. The socket member is connected to one of the axially opposite ends and has a first socket hole aligned with the axial through hole and configured to engage a nut or the like. The axial through hole is configured to permit passage of a bolt when the nut is tightened by the socket member.