Dock Leveler Air Bag Actuator for Hygienic Loading
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Solution Overview
Problem
Existing loading dock levelers face challenges in maintaining hygiene and safety, particularly in environments where hydraulic oil leaks are a concern, such as food or drug processing facilities, and require designs that simplify maintenance and repair.
Innovation Solution
A loading dock leveler utilizing a bellows assembly with inflatable air bags as pneumatic actuators, which move the deck between upper and lower positions, and a mechanical motion transfer device to facilitate smooth movement and maintenance access, eliminating the need for hydraulic oil and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hydraulic cylinders are used to move the deck, then the lifting force and structural strength are improved, but the risk of oil contamination and hygiene issues worsen
Solution Approach 1:
The patent replaces hydraulic cylinders with pneumatic air bags as the actuating mechanism. The air bags use compressed air instead of hydraulic oil to generate lifting force, thereby eliminating oil contamination risks while maintaining the necessary strength to move the deck between loaded and unloaded positions.
Solution Approach 2:
The invention substitutes the hydraulic mechanical system with a pneumatic system. By using air bags that expand and contract based on air pressure, the system achieves the same mechanical function of moving the deck without the harmful effects of hydraulic fluid leakage.
2Object-affected harmful factors
If air bag actuators are used to eliminate contamination risk, then hygiene and safety are improved, but the lifting force and structural support capability may worsen
Solution Approach 1:
The air bag actuators are designed to operate at high pressures to generate sufficient lifting force. By controlling the air pressure and using appropriately sized air bags, the system achieves the necessary mechanical strength to support and move the deck while maintaining the hygiene advantage of using air instead of hydraulic fluid.
3Strength
If complex mechanical linkages are used to move the deck, then the lifting capability is improved, but the complexity of the system and maintenance difficulty worsen
Solution Approach 1:
The patent extracts and eliminates complex mechanical linkages, cables, and intermediate transmission mechanisms from the system. By using air bags that directly expand and push the deck upward, the invention simplifies the overall system architecture while maintaining full lifting capability, thereby reducing maintenance requirements and improving reliability.
Solution Approach 2:
The air bag actuators provide self-contained lifting action without requiring complex external mechanical linkages. The air bags directly convert pneumatic pressure into mechanical motion, eliminating the need for intermediate mechanical components that would increase system complexity and maintenance needs.
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 safe, hygienic, and easily maintainable loading dock leveler that ensures reliable operation by using pressurized air actuators, reducing the risk of contamination and simplifying maintenance processes.
Implementation Method 1
an inflatable air bag with a bottom surface engaging the base and a top surface engaging a lever arm hingedly mounted to the base, the lever arm and air bag moving between an inflated position and a deflated position, the air bag having an internal chamber in communication with a source of pressurized air
Data Source
AI summary
A loading dock leveler having: a base with an inward end; a deck with a top platform, the deck having an inward end hingedly mounted to the inward end of the base for movement between an upper position and a lower position; a bellows assembly spaced a distance below the deck, the bellows assembly including an inflatable air bag with a bottom surface engaging the base and a top surface engaging a lever arm hingedly mounted to the base, the lever arm and air bag moving between an inflated position and a deflated position, the air bag having an internal chamber in communication with a source of pressurized air and an air vent; a support strut having an upper end engaging the deck and a lower end engaging the base, the support strut being moveable with the deck between: the lower position; and the upper position wherein the support strut supports the deck, and; a mechanical motion transfer device engaging the lever arm of the bellows assembly and engaging the base, the motion transfer device transferring relative motion between the base and the lever arm to the support strut, wherein the motion of the lever arm from the deflated to the inflated position moves the support strut from one of: the lower position to the upper position; and the upper position to the lower position.