One-Handed Rocker Latch for Plastic Enclosures
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Solution Overview
Problem
Existing industrial enclosures require two hands to operate the latch device due to the need for significant force to counteract the spring force of the sealing gasket, making it difficult to close the lid, especially when installed in high places, and often feature complex mechanisms with many movable parts.
Innovation Solution
A plastic enclosure with a latch device comprising a rocker and handle arm that provides a mechanical advantage through a lever effect, allowing the lid to be locked or released with one hand, using a simple structure with snap-fit joints and a resilient sealing gasket to amplify the force applied, enabling efficient sealing without complex mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resilient sealing gasket with spring force is used to provide sealing, then sealing reliability is improved, but the force required to operate the latch device increases
Solution Approach 1:
The latch device uses a rocker mechanism that pivots about an axis to dynamically convert a small input force applied at the handle arm into a large output force at the hook portion. The rocker rotates between a release position and a locking position, enabling the operator to overcome the sealing gasket's spring force through rotational motion rather than direct linear force application.
Solution Approach 2:
The solution transitions from direct linear force application to rotational force application. The rocker mechanism allows the operator to apply force in a rotational dimension (turning the handle arm) which is then converted into linear compressive force on the sealing gasket, making operation feasible with one hand even at high mounting positions.
2Reliability
If a latch device with sufficient closing force is designed, then sealing effectiveness is improved, but the device complexity increases
Solution Approach 1:
The latch device is segmented into distinct functional components: a rocker body, a hook portion for engaging the lug, a handle arm for manual operation, and pivot axles for rotation. This segmentation allows each component to perform its specific function efficiently while keeping the overall structure simple and maintainable.
Solution Approach 2:
The rocker acts as an intermediary mechanism between the operator's hand and the sealing gasket. Instead of directly compressing the gasket, the operator turns the handle arm, which rotates the rocker, which then uses its hook portion to engage and compress the gasket via the lug. This intermediary mechanism provides mechanical advantage while maintaining simplicity.
3Area of stationary object
If the enclosure is installed at a high place above installer's head, then space utilization is improved, but the ease of operation decreases
Solution Approach 1:
The dynamic rocker mechanism allows the operator to generate sufficient closing force through rotational motion of the handle arm, even when working with outreached hands at high mounting positions. The pivot-based rotation enables force amplification that would be difficult to achieve through static direct pressing.
Solution Approach 2:
By converting the closing action from direct linear pressing to rotational turning of the handle arm, the operator can more easily generate the required force even at extended reach positions. The rotational dimension provides mechanical leverage that compensates for the disadvantaged positioning of working above head level.
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
Enables easy one-handed operation of the latch device with reduced force requirement, providing a secure seal for industrial components while maintaining a simple and robust design, suitable for various industrial applications.
Implementation Method 1
The output force of the hook portion exerted to the lug is amplified by a mechanical advantage provided by a lever effect of the rocker when being turned to the locking position by an input force exerted to the handle arm.
Implementation Method 2
the hook portion is turned to protrude laterally outwards through the through-hole of the lug and to compress the sealing gasket by pressing the sealing flange against the sealing gasket to create a spring force against which the hook portion holds the lug.
Data Source
AI summary
The invention relates to a plastic enclosure for enclosing industrial components. The enclosure comprises a case (2), a lid (9), and a latch device (13) for locking the lid to the case. The lid (9) has a grip means formed as a rigid lug (14) molded to be monolithic with the lid (9), the lug comprising a throughhole (19) to which a hook portion (17) of a rocker (15) can grip. The lug (14) is arranged, in the closed position of the lid, to extend over and at a distance from the second wall (7) to be substantially in parallel with a wall of the case to limit an intermediate space between the wall (7) and the lug (14) when the lid is in the closed position. The hook portion (17) is arranged so that, in the release position (II) of the rocker (15), it is turned inside the intermediate space away from the path of the lug (14) and, in the locking position (I) of the rocker, the hook portion is turned to protrude laterally outwards through the through-hole (19) of the lug (14) and to compress the sealing gasket (12) by pressing the sealing flange (8) against the sealing gasket (12) to create a spring force against which the hook portion holds the lug (14). The output force of the hook portion (17) exerted to the lug (14) is amplified by a mechanical advantage provided by a lever effect of the rocker (15) when being turned to the locking position by an input force exerted to the handle arm (18).