Dock Leveler Curtain Assembly for Lower Edge Gap Sealing
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Solution Overview
Problem
Existing dock levelers face challenges in sealing the gap between the dock face and the vehicle, particularly at the lower edge of the doorway, due to the extension of the lip into the vehicle, which complicates the sealing between the interior and exterior environments.
Innovation Solution
A curtain assembly with universally positionable connectors and a releasable coupling system is installed on the dock leveler, comprising an upper and lower curtain section made of pliable material, which folds in a predetermined pattern to seal the gap and is detachable from the base frame, using fasteners and elastic tensioners to maintain sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dock leveler with a movable deck and lip is used to compensate for height differences, then the ease of operation for loading and unloading is improved, but the ability to seal the gap between the dock face and vehicle is worsened
Solution Approach 1:
The sealing system is divided into multiple independent components: upper seal, lower seal, and side seals. Each seal segment can independently adapt to the movement of the dock leveler components while maintaining sealing effectiveness. The upper seal attaches to the movable deck, the lower seal attaches to the stationary dock face, and side seals fill lateral gaps, creating a segmented sealing strategy that accommodates the movable deck and lip mechanism.
Solution Approach 2:
The patent employs flexible seal elements including fabric or vinyl curtains for the upper and lower seals, and flexible side seals that can deform and conform to the changing geometry created by the movable deck and lip. These flexible materials allow the sealing system to adapt to the dynamic positions of the dock leveler components while maintaining continuous contact to prevent air and contaminant infiltration.
2Object-affected harmful factors
If environmental enclosures are installed along the upper and lateral edges to reduce gaps, then the sealing performance is improved, but the device complexity is worsened
Solution Approach 1:
The dock leveler components serve multiple functions: the deck provides both the loading surface and the mounting structure for the upper seal, while the lip provides both the height adjustment function and the mounting structure for the lower seal. The side seals simultaneously address both lateral edge gaps. This multi-functionality reduces the need for separate dedicated sealing components, thereby reducing overall system complexity while maintaining comprehensive sealing performance.
Solution Approach 2:
The sealing system is designed to be self-adjusting through the movement of the dock leveler components themselves. As the deck and lip move to different positions, the seals automatically adjust their positions and contact points without requiring additional actuators or complex control mechanisms. The movable deck carries the upper seal with it, and the lip carries the lower seal, creating a self-service sealing system that adapts automatically to the operational positions.
3Ease of operation
If the lip extends beyond the dock face to bridge the gap, then the ease of operation for loading is improved, but the ability to seal along the lower edge is worsened
Solution Approach 1:
The lower seal acts as an intermediary element between the extended lip and the dock face. It attaches to the lip structure and provides the sealing interface with the dock face, allowing the lip to extend for loading operations while the lower seal maintains the sealing function. This intermediary sealing component resolves the conflict between the lip's need to extend for ease of operation and the need to maintain sealing along the lower edge.
Solution Approach 2:
The sealing solution moves from a single-plane sealing approach to a three-dimensional sealing system. The lower seal not only seals the horizontal gap between the lip and dock face but also addresses vertical and lateral sealing needs through its positioning and configuration. Side seals add another dimensional component by sealing the lateral edges, creating a multi-dimensional sealing envelope that accommodates the extended lip position while preventing infiltration from multiple directions.
Data Source
AI summary
Example dock leveler apparatuses are disclosed. A dock leveler apparatus includes a curtain assembly that includes an upper curtain section and a lower curtain section. The curtain assembly is movable between a folded configuration and a pendant configuration. The curtain assembly having a longer length in the pendant configuration than in the folded configuration. A connector couples to the upper curtain section to a deck pivotally coupled to a base frame of a dock leveler. A releasable coupling between the upper curtain section and the lower curtain section. The releasable coupling is to removably couple the lower curtain section and the upper curtain section.