Sliding Door Drop Seal Actuation Without Hinge Advantage

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Solution Overview

Problem

Automatic drop seals have not been effectively implemented in sliding doors due to the lack of a mechanical advantage typically available in swing doors, hindering their advancement.

Innovation Solution

A sliding door system with a drop seal mechanism that includes a frame, a sliding door, and a drop seal mechanism mounted within the door, utilizing a projection to drive the seal from a retracted to a deployed state as the door slides, featuring a channel member, seal member, actuation lever, and transmission to facilitate sealing with the frame.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If automatic drop seals are implemented in sliding doors, then sealing effectiveness is improved, but the lack of mechanical advantage at the hinge edge makes actuation difficult

Engineering Contradiction:

Improvesealing effectivenessVSAvoidactuation difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

A projection extending from the door frame acts as an intermediary element that engages with the drop seal mechanism. This projection provides a mechanical interface that translates the sliding motion of the door into the actuation force needed to deploy the seal, overcoming the lack of hinge-based mechanical advantage

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the traditional hinge-based mechanical advantage system with a sliding-door-compatible actuation mechanism. Instead of relying on rotational leverage at a hinge, the system uses a projection-driven mechanism that converts linear sliding motion into seal deployment, substituting the mechanical advantage source to match the sliding door's movement characteristics

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If external actuators are used to deploy the drop seal, then sealing function is achieved, but device complexity and external components increase

Engineering Contradiction:

Improvesealing functionVSAvoidnumber of external components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The drop seal mechanism is merged with the door structure itself, with the seal and actuation components integrated into the door assembly. The projection from the frame works directly with the integrated mechanism, eliminating the need for separate external actuators and reducing overall system complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The door's own sliding motion serves to actuate the drop seal mechanism. As the door slides into the closed position, the projection automatically engages and deploys the seal without requiring external actuators or additional power sources, allowing the system to self-actuate using its inherent movement

Inventive Principle:

Principle #25Self-service

3Ease of operation

If the drop seal mechanism is concealed within the door, then aesthetics and safety are improved, but mechanism design complexity increases

Engineering Contradiction:

Improveaesthetics and safetyVSAvoidconcealment mechanism design

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The drop seal mechanism is nested within the door assembly, with components arranged in a compact configuration that fits within the door's structure. The seal and actuation elements are housed within the door body, creating a nested arrangement that conceals the mechanism while maintaining functionality

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Instead of having the mechanism extend outward from the door, the design inverts the arrangement by placing the actuation elements on the frame side (projection) and having them engage with seal components that deploy from within the door. This inverted configuration allows concealment while simplifying the overall mechanism design

Inventive Principle:

Principle #13The other way round (Inversion)

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 provides a seamless seal with reduced user resistance and concealed components, enhancing functionality and safety by eliminating the need for external actuators, while ensuring the seal extends along the door's length.

Implementation Method 1

Automatic drop seals have been utilized in swing doors, these mechanisms often rely upon the large mechanical advantage provided at the hinge edge of the closure

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Implementation Method 2

The seal member is actuated by the actuation lever between a retracted position and a deployed position through a transmission

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12509937B2Sliding door seal

Publication Date: 2025.12.30 SCHLAGE LOCK CO LLC

AI summary

Certain embodiments of the present application relate to a sliding door system. An example sliding door system includes a frame, a sliding door, and a drop seal mechanism. The sliding door is mounted in the frame for sliding movement between an open position and a closed position. The drop seal mechanism is mounted within the sliding door, and has a deployed state in which the drop seal mechanism forms a seal with the frame, and a retracted state in which the drop seal mechanism does not form a seal with the frame. The frame comprises a projection configured to drive the drop seal mechanism from the retracted state to the deployed state as the sliding door slides from the open position to the closed position.