DIN Rail Latching Device with Automatic Grounding
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Solution Overview
Problem
DIN rail mounted electrical devices lack sufficient stability and grounding, with movable latches being weak and requiring tools for removal, and existing grounding methods being cumbersome and prone to damage, especially during PCB replacements.
Innovation Solution
A DIN rail latching device with both top and bottom fixed retaining tabs and an automatic grounding mechanism, featuring a single-piece design with a spring section that secures the device to the rail and automatically connects the PCB to ground, using a stamped metal form for enhanced holding force and visibility for tool engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a movable spring-loaded latch is used for DIN rail mounting, then easy installation and removal is achieved, but stability and holding strength are insufficient
Solution Approach 1:
The latching device is divided into two distinct latches: a first latch (movable spring-loaded) for easy engagement and release, and a second latch (fixed retaining tab) for strong holding. This segmentation allows each latch to specialize in its function while working together to achieve both ease of operation and strength.
Solution Approach 2:
The patent combines a movable spring-loaded latch and a fixed retaining tab into a single integrated latching device. The movable latch provides the ease of operation while the fixed tab provides the holding strength, merging both functions into one component that achieves both contradictory requirements.
2Ease of operation
If a tool-activated latch is used for removal, then visibility and control are improved, but device complexity increases
Solution Approach 1:
The movable latch serves multiple functions: it provides the visible release mechanism for easy operation, acts as a spring-loaded actuator, and works in conjunction with the fixed retaining tab to provide secure mounting. This multi-functionality reduces the need for separate components, thereby reducing overall complexity while maintaining visibility and control.
3Reliability
If separate grounding connections are used for PCBs, then grounding reliability is achieved, but installation time and complexity increase
Solution Approach 1:
The latching device incorporates a pre-configured grounding connection through its conductive body. When the device is mounted to the DIN rail, the grounding path is automatically established in advance, eliminating the need for separate grounding connections to be made during installation or PCB replacement. This preliminary setup of grounding reduces installation time while maintaining reliability.
Solution Approach 2:
The latching device automatically provides grounding to the DIN rail through its conductive body and integrated grounding path. This self-service grounding mechanism eliminates the need for external grounding operations, allowing the device to ground itself automatically upon installation, thereby reducing installation time and complexity while ensuring reliable grounding.
4Strength
If a stamped metal spring form is used, then holding force and electrical connection are improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the spring element and the grounding path into a single stamped metal component. This integrated design allows the spring to provide both the mechanical holding force and the electrical grounding function simultaneously. While stamping requires specific manufacturing capabilities, it eliminates the need for separate spring components and grounding elements, reducing assembly steps and overall manufacturing complexity.
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 provides a rugged, easy-to-use latching system that ensures secure attachment and removal of devices, automatic grounding, and improved side-to-side holding force, reducing the risk of damage during installation and maintenance.
Implementation Method 1
a spring section located between the stationary section and the movable section, the spring section maintaining the movable section in a first position wherein the electrical device is secured to the DIN rail and operatively moving the movable section to a second position wherein the electronic device can be removed from the DIN rail
Data Source
AI summary
A DIN rail latching device providing automatic grounding of printed circuit boards inside an electrical device as the electrical device is attached to the DIN rail. The DIN rail latching device includes a stationary section, a movable section and a spring section, all made from a single piece of electrically conductive material. The movable section being moved from a first position wherein the electrical device is secured to the DIN rail by a DIN rail engagement leg of the movable section to a second position wherein the DIN rail engagement leg is retracted such that the electrical device can be removed from the DIN rail. The stationary section being attached to a bottom surface of the electrical device such that it cannot move with respect to the bottom surface. The stationary section also includes a ground stab formed from the stationary section and configured for connecting to a spring type ground terminal of a PCB located inside the electrical device such that removal and installation of PCBs is easily accomplished.