Bevel-Gear Fastener Driver for Long Threaded Rod Access
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Solution Overview
Problem
Existing fastener driving tools struggle to efficiently drive fasteners onto threaded rods, particularly those of larger lengths, due to limitations in torque conversion and accessibility.
Innovation Solution
A fastener driving tool with a transmission assembly comprising multiple bevel gears and bushings that convert input torque from an input shaft to output torque, allowing for efficient rotation of a fastener on a threaded rod, while maintaining accessibility and reducing wear through lubricant flow and stationary bushing support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple direct-drive mechanism is used, then the device complexity is reduced, but the torque conversion efficiency deteriorates
Solution Approach 1:
The patent introduces an intermediate shaft as a mediator between the input shaft and output shaft. This intermediate shaft carries bevel gears that mesh with both the input and output bevel gears, enabling efficient torque conversion while maintaining a relatively simple overall structure. The intermediate shaft acts as a bridge that facilitates the torque transfer path without requiring a complex direct coupling mechanism.
Solution Approach 2:
The transmission mechanism is segmented into three separate rotating components: an input shaft with input bevel gear, an intermediate shaft with intermediate bevel gear, and an output shaft with output bevel gear. This segmentation allows each component to be optimized independently for its specific function while working together to achieve efficient torque conversion, resolving the contradiction between simplicity and efficiency.
2Volume of moving object
If a compact transmission assembly is used, then the tool size is reduced, but the accessibility for driving fasteners on long threaded rods deteriorates
Solution Approach 1:
The patent makes the entire transmission assembly dynamic by allowing the input shaft, intermediate shaft, and output shaft to rotate independently within the housing. This dynamic configuration enables the tool to maintain a compact form factor while providing sufficient accessibility, as the rotating components can accommodate the mechanical movements required for driving fasteners on threaded rods of various lengths without requiring a larger overall tool size.
3Power
If high torque conversion is achieved through multiple gear stages, then the power transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by optimizing the gear arrangement in the critical torque conversion zone. The bevel gears are specifically positioned and sized to achieve the required torque conversion ratio at the most efficient point in the transmission path. This localized optimization allows high power transmission efficiency to be achieved without unnecessarily increasing the overall device complexity, as the gear stages are concentrated where they are most needed rather than distributed throughout the entire tool.
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 tool effectively drives fasteners onto threaded rods of various lengths, enhancing torque transfer efficiency and reducing wear, thereby improving operational reliability and versatility.
Implementation Method 1
A fastener driving tool with a transmission assembly comprising multiple bevel gears and bushings that convert input torque from an input shaft to output torque
Implementation Method 2
reducing wear through lubricant flow and stationary bushing support
Data Source
AI summary
A fastener driving tool is for driving a fastener onto a threaded rod. The fastener driving tool includes a housing, a tower supported by the housing, an input member rotatably supported by the tower, an output member rotatably supported by the tower, and an intermediate member rotatably supported by the tower and operatively coupled between the input member and the output member. The input member defines a first rotational axis. The output member is configured to rotatably support the fastener. The output member defines a second rotational axis. The intermediate member is configured to convert an input torque from the input member about the first rotational axis to an output torque about the second rotational axis.