Hand Tool with Torque-Limiting Socket for Coaxial Cable Locknuts
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Solution Overview
Problem
Existing hand tools for fastening coaxial cable locknuts to electrical connectors in cable TV systems often apply excessive pressure, leading to damage of the locknut or socket, resulting in reduced durability and inability to rotate the locknut positively once wear occurs.
Innovation Solution
A hand tool design featuring a sleeve with a transmission shaft and compression spring, where the tooth blocks and stop blocks are angled to engage and disengage at specific torque values, allowing the tool to run idle and prevent damage by releasing pressure when excessive force is applied, ensuring the locknut and socket are not damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional wrench is used to fasten the locknut, then the locknut can be tightened, but excessive pressure is applied causing damage to the locknut or socket
Solution Approach 1:
The wrench incorporates a dynamic mechanism where the socket can rotate independently of the handle. When excessive torque is applied, the socket rotates to disengage from the locknut, preventing damage. This dynamic behavior allows the tool to adapt to varying torque levels and protect against over-tightening.
Solution Approach 2:
The invention introduces an intermediary mechanism between the handle and the locknut - a rotating socket with a stop block and spring system. This intermediary absorbs excess force by rotating and disengaging, acting as a buffer that protects both the locknut and the tool from damage while still enabling proper fastening.
2Productivity
If the socket is pressed to rotate the locknut, then the locknut can be fastened tight, but the locknut or socket starts to wear and the user cannot rotate the locknut positively
Solution Approach 1:
The socket is designed to rotate dynamically within the handle assembly. When the locknut is properly tightened, the socket rotates to a stop position where the stop block engages with the socket's rotation limit. This dynamic rotation allows the socket to engage positively with the locknut while preventing excessive rotation that would cause wear.
Solution Approach 2:
The spring-loaded stop block provides tactile feedback to the user when the socket reaches its rotation limit. This feedback mechanism indicates when the locknut is properly tightened, allowing the user to stop applying force before damage occurs, thereby maintaining positive rotation capability throughout the fastening process.
3Strength
If the hand tool applies high pressure to fasten the locknut, then the locknut can be secured, but the corner of the locknut is damaged
Solution Approach 1:
The rotating socket acts as an intermediary between the applied force and the locknut. When high pressure is applied, the socket rotates to absorb the excess force, preventing direct transmission of damaging forces to the locknut's corner. This intermediary mechanism maintains locking strength while protecting against harmful effects.
Solution Approach 2:
The invention converts the potentially harmful excessive force into a beneficial rotating motion of the socket. The excess torque that would normally damage the locknut is instead utilized to rotate the socket to its stop position, where it naturally disengages. This transforms a harmful effect into a protective mechanism that prevents damage.
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 hand tool effectively prevents damage to the locknut and socket by automatically disengaging at a predetermined torque, enhancing durability and maintaining positive rotation capabilities even when the locknut is slightly worn.
Implementation Method 1
a compression spring arranged between the cylindrical body and the first bushing
Data Source
AI summary
A tool is configured to receive a locknut of a coaxial cable. The tool includes a sleeve provided with a first inner hole therein; a first block in the first inner hole, wherein the first block has a gradually small cross-sectional area from top to bottom in an axis of the first inner hole; a second block in the first inner hole, wherein the second block has a gradually small cross-sectional area from top to bottom in the axis of the first inner hole; and a third block in the first inner hole, wherein the third block has a gradually small cross-sectional area from bottom to top in the axis of the first inner hole, wherein the third block is configured to be between the first and second blocks, wherein the third block has a first surface configured to contact the first block and a second surface configured to contact the second block.