Shear Wrench Sleeve Assembly for Balanced Torque and Bolt Tip Ejection
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Solution Overview
Problem
Shear wrench tools cause user fatigue due to the need to counteract the moment of force from the motor and transmission weight, and existing designs complicate the removal of sheared bolt tips.
Innovation Solution
A shear wrench tool with an electric motor, planetary gear transmission, and an ejection mechanism that includes a handle positioned to balance moments of force and a mechanism for rotating output sleeves in opposite directions, along with a spring-actuated ejection system to remove sheared bolt tips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor and transmission are positioned at the rear of the tool, then the structural layout is simplified, but user fatigue increases due to unbalanced moment of force
Solution Approach 1:
The patent positions the handle at a specific location along the axial length of the tool to create a counterbalancing moment of force. The handle acts as a counterweight that offsets the moment generated by the rear-mounted motor and transmission, thereby balancing the tool and reducing user wrist fatigue during operation.
2Productivity
If the output sleeves are designed to mate with nuts and bolt tips, then the shearing function is achieved, but the removal of sheared bolt tips becomes complicated
Solution Approach 1:
The patent designs the second output sleeve with features that enable easy extraction of sheared bolt tips. The sleeve includes mechanisms such as reduced friction surfaces, tapered edges, or magnetic fields that actively assist in releasing and extracting the sheared bolt tip from the sleeve after the shearing operation is complete.
3Extent of automation
If the ejection mechanism uses a spring-actuated system with impact parts, then the sheared bolt tip removal is automated, but the device complexity increases
Solution Approach 1:
The ejection mechanism is designed to operate automatically using the rotational energy already present in the system. The spring-actuated impact parts utilize the rotation of the output sleeves to trigger the ejection sequence, eliminating the need for external actuators or complex control systems. The mechanism serves itself by harnessing the operational energy of the 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
Reduces user fatigue by balancing moments of force and facilitates easy removal of sheared bolt tips through a spring-actuated ejection mechanism, enhancing operational efficiency.
Implementation Method 1
biasing means for urging the first active surface into engagement with the second active surface... the biasing means subsequently urges the first impact part back into engagement with the second impact part for generating an impulse
Implementation Method 2
transmission having a plurality of planetary gear stages... the electric motor is configured to provide torque via the transmission to the output section for causing the first and second output sleeves to be rotated in opposite directions
Data Source
AI summary
A sleeve assembly for a shear wrench tool including an output sleeve configured to mate with a nut to facilitate winding of the nut onto a threaded bolt and having a plurality of circumferentially arranged locking features for interlocking with those of a transmission sleeve. A transmission sleeve for transferring torque between the output sleeve and at least one feature of a shear wrench tool transmission section. The transmission sleeve has a first set of circumferentially arranged locking features for interlocking with the locking features of the output sleeve and a second set of circumferentially arranged locking features for cooperating with a locking sleeve. A locking sleeve coupled to the output sleeve in a manner which permits the locking sleeve to rotate between first and second rotational positions relative to the output sleeve.