Counterbalanced Shear Wrench With Automatic Bolt Tip Ejection
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Solution Overview
Problem
Shear wrench tools face challenges in user fatigue due to the need to counteract the moment of force caused by the weight of the motor and transmission, and existing designs do not efficiently remove the sheared bolt tip for reuse.
Innovation Solution
The shear wrench tool incorporates an electric motor with a transmission system featuring planetary gear stages and an ejection mechanism with a biasing system to rotate output sleeves in opposite directions, allowing for balanced handling and automatic ejection of the sheared bolt tip using a spring-activated impact mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor and transmission are positioned at the rear of the tool, then the tool can provide sufficient torque for shearing bolt tips, but the user experiences fatigue due to the unbalanced moment of force
Solution Approach 1:
The patent positions the motor and transmission assembly at the rear of the tool, using the weight of these components as a counterbalance to offset the moment of force generated during operation. This counterweight arrangement reduces the net moment that the user must counteract with their wrist, thereby reducing fatigue while maintaining the high torque output needed for shearing bolt tips.
2Device complexity
If the sheared bolt tip remains in the output sleeve after shearing, then the tool structure remains simple, but the user must manually remove the tip before tightening another bolt, reducing efficiency
Solution Approach 1:
The patent incorporates an ejection mechanism that automatically removes the sheared bolt tip from the output sleeve immediately after the shearing operation is complete. This preliminary action of tip ejection eliminates the need for manual removal, allowing the user to quickly proceed to the next bolt without interruption, thereby significantly improving operational efficiency.
Solution Approach 2:
The ejection mechanism is designed to be self-activating, using the rotational motion already present in the system after shearing to trigger the ejection of the bolt tip. The mechanism automatically performs the removal function without requiring additional user intervention or complex external systems, maintaining relative simplicity while enabling automated tip ejection.
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 reduces user fatigue by balancing moments of force during use and enables efficient removal and reuse of the sheared bolt tip, enhancing operational efficiency and convenience.
Implementation Method 1
biasing means for urging the first active surface into engagement with the second active surface
Data Source
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AI summary
A shear wrench tool comprising: an electric motor, an output section having first and second output sleeves and a transmission for transferring torque from the motor to the output section wherein in use the output sleeves are caused to be rotated in opposite directions relative to each another, the first output sleeve configured for mating with a nut and the second output sleeve configured for mating with a tip of a bolt to be sheared; the shear wrench tool further comprising an ejection mechanism having a first impact part which is both rotationally and axially movable and which has a first active surface, a second impact part which is rotationally restricted but axially movable and which has a second active surface, the ejection mechanism also having biasing means for urging the first active surface into engagement with the second active surface, wherein in use the first impact part receives torque from the electric motor for causing the first impact part to rotate relative to the second impact part whereby during such rotation interaction between the first and second active surfaces causes the first impact part to disengage from the second impact part against force of the biasing means whereby the biasing means subsequently urges the first impact part back into engagement with the second impact part for generating an impulse which is transferred via the second impact part to a sheared bolt tip for urging the sheared bolt tip out of the second output sleeve.