Torque Wrench Lock Device with Nested Self-Service Mechanism
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Solution Overview
Problem
Conventional torque wrenches lack a reliable mechanism to prevent accidental adjustment of the torque limit value during operation and suffer from friction issues when setting the torque limit, which affects user efficiency.
Innovation Solution
A torque wrench design featuring a lock device with a movable locking sleeve, a restoring elastic member, and a positioning assembly that allows for secure locking and unlocking of the handle relative to the hollow shank, along with a clutch assembly and torque elastic member to manage torque application, reducing friction through ball recesses and a polygonal adjusting end for easy torque setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock device is added to prevent accidental rotation of the grip member, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The locking member is disposed within the grip member, and the locking groove is formed on the shank. The locking mechanism is nested within the existing structure components, with the locking member movable within the grip member to engage with the locking groove on the shank, preventing accidental rotation while maintaining a compact design
Solution Approach 2:
The locking member is biased by a spring to automatically engage with the locking groove on the shank. When the grip member is rotated to adjust the torque limit, the locking member automatically disengages from the locking groove and re-engages at the new position, providing automatic locking without requiring additional user actions or complex control mechanisms
2Adaptability or versatility
If the clutch assembly is moved relative to the shank to set torque limit, then adjustability is improved, but friction increases making operation difficult
Solution Approach 1:
The clutch assembly is extracted from the fixed position on the shank and made movable relative to the shank through the rotation of the grip member. The clutch assembly can be independently positioned by rotating the grip member, which moves the clutch assembly along the shank to different locations, enabling torque limit setting while reducing the direct friction between the clutch assembly and shank during adjustment
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 solution effectively prevents accidental torque limit adjustments and minimizes friction, enhancing user safety and efficiency by ensuring precise torque control and reducing the force required to set the torque limit.
Implementation Method 1
The torque elastic member is disposed in the hollow shank and abuts against the adjusting threaded member. The clutch assembly is disposed between the driving rod and the torque elastic member and is pushed by the torque elastic member to produce a clutch action.
Implementation Method 2
a restoring elastic member arranged between the locking sleeve and the handle
Implementation Method 3
at least one positioning elastic member disposed in the at least one positioning hole. The at least one positioning member is selectively engaged in the positioning recess as the locking sleeve moves relative to the handle.
Implementation Method 4
when setting the torque limit value, the clutch assembly must be moved relative to the shank, so the friction between the clutch assembly and the shank will affect the user to apply the force to rotate the grip member.
Data Source
AI summary
A torque wrench has a lock device, which includes a locking sleeve, a restoring elastic member, a clamping member, a locking hole, a locking member, and a positioning assembly. The locking sleeve is provided with an accommodating recess, an abutting portion, and a positioning recess. When the lock device is in a lock position, the locking member is pushed by the abutting portion and pressed against a hollow shank to restrict a handle from rotating relative to the hollow shank. When the lock device is in an unlock position, the locking member is detached from the abutting portion, so that the handle is rotatable relative to the hollow shank.