Low-Torque Electrical Connector Interface With Cam Engagement

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Solution Overview

Problem

Existing interface systems for securing and locking electrical connectors suffer from issues such as high torque requirements, wear on components, and the need for lubrication, which can damage sensitive electronics and lead to cross-threading and tilting problems, affecting the reliability and longevity of the connection.

Innovation Solution

The proposed interface system includes a receiver and test adapter with a latch post, drive shaft, drive screw, and springs, which provide a low-torque engagement mechanism using a threaded exterior portion of the drive screw engaging with the drive shaft, allowing for precise alignment and secure mating without the need for excessive lubrication, thereby reducing wear and torque requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional screw engagement mechanisms are used, then secure locking of electrical connectors is achieved, but high torque requirements and wear on components occur

Engineering Contradiction:
Improvelocking strengthVSAvoidcomponent wear
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The engagement mechanism is divided into multiple cam lobes (typically two or more) distributed around the circular path, each contributing to the locking action. This segmentation distributes the mechanical stress and wear across multiple contact points rather than concentrating it on a single screw thread, thereby reducing component wear while maintaining secure locking strength.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The mechanism employs a circular or curved cam path instead of linear screw threads. The cam lobes are shaped with curved surfaces that rotate along a circular trajectory, converting the traditional linear threading motion into rotational camming action. This curvature allows for smoother engagement with reduced impact loads and distributed wear, while the cam profile geometry provides the necessary mechanical advantage for secure locking.

Inventive Principle:
Principle #14Spheroidality (Curvature)

2Ease of operation

If lubrication is applied to reduce friction, then smooth operation is improved, but damage to sensitive electronics and cross-threading occurs

Engineering Contradiction:
Improveoperation smoothnessVSAvoidelectronic component damage
Core Design Contradiction:
Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional screw-threading mechanical system with a cam-based rotational engagement system. Instead of relying on threaded friction for engagement, the cam lobes provide mechanical advantage through their geometric profile, pushing the connector into place through controlled rotational motion. This substitution eliminates the need for lubrication entirely, as the cam action provides smooth operation through its inherent mechanical geometry rather than friction reduction.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cam mechanism is designed to be self-lubricating through its geometric design, where the cam profile and follower surfaces are shaped to minimize friction through proper contact angles and distributed loading. The mechanical advantage is derived from the cam geometry itself rather than from lubricated threads, making the system inherently smooth-operating without requiring external lubrication that could harm electronic components.

Inventive Principle:
Principle #25Self-service

3Strength

If standard screw engagement is used, then connector securing is achieved, but tilting and misalignment problems occur

Engineering Contradiction:
Improveconnector securingVSAvoidalignment precision
Core Design Contradiction:
StrengthVSManufacturing precision

Solution Approach 1:

The circular cam path provides a guided rotational trajectory that naturally maintains alignment between the mating connectors. As the cam lobes rotate along the circular path, they guide the engagement surfaces into proper alignment throughout the motion, preventing tilting and misalignment issues that can occur with linear screw engagement. The curved cam profile ensures that forces are applied centrally and symmetrically, maintaining precision alignment during the entire engagement process.

Inventive Principle:
Principle #14Spheroidality (Curvature)

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 system achieves reliable and durable engagement of electrical connectors with reduced wear and torque, ensuring consistent performance over the system's cycle life while protecting sensitive components from lubrication-related damage.

Implementation Method 1

a spring or a plurality of springs extending from the drive screw and having an enlarged portion at its distal end... the latch post tip must be inserted into the enlarged portion of the spring

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

the threaded exterior portion of the drive screw engaging with the threaded interior portion of the drive shaft

Methodology Applied
Scientific EffectFriction: Friction

Implementation Method 3

a low-torque engagement mechanism using a threaded exterior portion of the drive screw engaging with the drive shaft

Methodology Applied
Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentEP2499707B1interface
Publication Date: 2018.04.04 VIRGINIA PANEL
  • EP2499707B1 patent drawingFigure 1A~1B
  • EP2499707B1 patent drawingFigure 1C~1D
  • EP2499707B1 patent drawingFigure 2

AI summary

An interface having a receiver and a test adapter. The receiver has a body and a latch post connected to the body. The latch post has a body, a neck, and a tip with the tip being larger than the neck. The test adapter has a frame and an engagement assembly. The engagement assembly has a drive shaft having first and second ends, a drive knob connected to the first end of the drive shaft, a drive nut connected to the drift shaft near the second end of the drive shaft. The drive nut has a threaded interior portion. The drive assembly further has a drive screw and a drive screw housing. The drive screw has a threaded exterior portion such that the threaded exterior portion of the drive screw engages with the threaded interior portions of the drive nut. A spring extends from the drive screw longitudinally away from the threaded portion of the drive screw. The spring has an enlarged portion at its distal end. The drive screw housing surrounds the springs and has a recessed portion adjacent the enlarge portion of the spring when the engagement assembly is in a disengaged position.