Adjustable Torque Screwdriver With Slip Limit for Screw Protection
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Solution Overview
Problem
Conventional screwdrivers lack the ability to set a torque during rotation, leading to potential damage to screws due to excessive force application.
Innovation Solution
A torque screwdriver with a screwdriver handle, auxiliary scale ring, and internal components that allow for setting a precise torque limit, featuring a mechanism that disengages further rotation once the preset torque is reached, protecting the screw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a general screwdriver is used to drive screws, then the screw can be rotated and driven, but the torque cannot be set during rotation causing potential damage to the screw
Solution Approach 1:
The patent implements torque control by changing the mechanical parameter of the screwdriver through an adjustable torque limit mechanism. The torque limit component can be adjusted to different positions, changing the torque threshold at which the screwdriver engages the screw. This allows precise control of the torque parameter during screw driving, preventing excessive force that would damage the screw while maintaining sufficient force for proper installation.
Solution Approach 2:
The patent incorporates a feedback mechanism where the torque limit component provides continuous feedback on the applied torque. As the screwdriver rotates and applies force to the screw, the torque limit component monitors the torque level and provides feedback through mechanical engagement. When the preset torque limit is reached, the feedback mechanism prevents further torque transmission, protecting the screw from damage while allowing the user to understand when the torque threshold is exceeded.
2Productivity
If high force is applied to the screw during rotation, then the screw can be driven faster, but the thread of the screw will be damaged
Solution Approach 1:
The patent applies beforehand cushioning by pre-setting a torque limit before the screw driving operation begins. The torque limit component is configured to engage at a predetermined torque value, creating a protective cushion against excessive force. This preemptive measure ensures that even if high force is applied during rapid screw driving, the torque limit mechanism prevents the force from exceeding the safe threshold, thereby protecting the screw threads from damage while allowing high productivity.
3Measurement precision
If the torque limit is adjustable, then the precision of torque control is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the torque control function into distinct modular components. The torque limit component is segmented from the main screwdriver body, allowing independent adjustment and calibration. This segmentation enables precise torque control through a separate adjustable mechanism while keeping the overall device structure manageable. The modular design allows the torque limit mechanism to be optimized for precision without proportionally increasing the complexity of the entire screwdriver system.
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 device ensures that screws are not damaged by preventing further rotation beyond the set torque, ensuring precise and safe screw tightening.
Implementation Method 1
a first spring (10) is arranged on a side surface of the gasket (4)... One end of the first spring (10) is in contact with the third steel ball (16)
Implementation Method 2
a second spring (12) is arranged on a side surface of one end, located outside the screwdriver handle (1), of the screw rod (5)
Implementation Method 3
a bearing (15) is arranged on a side surface of the screw rod (5)
Data Source
AI summary
The present disclosure relates to the technical field of screwdrivers. Specifically, the torque screwdriver includes a screwdriver handle and an auxiliary scale ring; a screw rod is arranged inside the screwdriver handle; a bearing is arranged on a side surface of the screw rod; a main scale pipe is connected to an outer side of the bearing; an outer side of the main scale pipe is connected with the auxiliary scale ring; and a nut is arranged on an outer side of the auxiliary scale ring. During use of the device, when the screwdriver reaches a fixed torque, the device will slip if the device is continued to be rotated, so as to protect a screw and avoid the screw from being damaged.