Dock Leveler Lip Plate Reinforcement and Spring Simplification
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Solution Overview
Problem
Dock levelers face challenges such as inadequate weight distribution, high material costs, manufacturing complexities, operational difficulties, traction issues, and malfunctions due to their design and materials, particularly with conical-ended springs and manual operation leading to inefficiencies and safety concerns.
Innovation Solution
The dock leveler system incorporates a deck plate with a lip assembly, a pivot anchor, a counterbalancing assembly, a lift lever retainer, and a maintenance strut, along with a thermosetting super durable polyester powder coating to enhance friction, addressing weight distribution, material costs, operational ease, and traction by providing structural rigidity, reducing internal loads, and improving user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conical-ended springs are used to assist in lifting and lowering the lip, then the attachment to components is facilitated, but manufacturing complexity and material costs increase
Solution Approach 1:
The patent replaces expensive conical-ended springs with standard cylindrical springs that have simple, uniform geometry. These standard springs are easier and cheaper to manufacture, eliminating the need for complex conical shaping while still providing the necessary spring assistance function for lifting and lowering the lip.
Solution Approach 2:
The patent changes the geometric parameters of the spring from conical (variable diameter) to cylindrical (constant diameter). This parameter change simplifies manufacturing while maintaining the spring's functional properties for assisting lip movement.
2Ease of manufacture
If conical portion is added to the spring, then attachment is facilitated, but material costs increase
Solution Approach 1:
The patent uses standard cylindrical springs instead of conical-ended springs, reducing material consumption by eliminating the extra material required for conical shaping. This reduces both material costs and manufacturing complexity while maintaining attachment capability.
3Ease of manufacture
If conical portion is added to the spring, then attachment is facilitated, but spring constant varies and decreases across the conical portion
Solution Approach 1:
The patent changes the spring geometry from conical (variable cross-section) to cylindrical (constant cross-section). This ensures uniform spring constant throughout the spring length, providing consistent and predictable mechanical behavior for lifting and lowering the lip.
4Strength
If dock leveler is made heavy to handle weight loads, then load handling capability is improved, but internal impact and static loads increase
Solution Approach 1:
The patent uses counterbalancing springs to offset the weight of the lip assembly. This reduces the net load on the heavy-duty components during operation, decreasing internal impact and static loads while maintaining the ability to handle external weight loads from trucks and trailers.
Solution Approach 2:
The patent incorporates movable and adjustable components that allow the dock leveler to adapt to varying load conditions. The spring-assisted lip and adjustable positioning mechanisms enable dynamic response to loads, reducing stress on structural components.
5Stability of the object's composition
If support is added at locations lower on the face plate, then structural stability is improved, but material costs and manufacturing complexity increase
Solution Approach 1:
The patent divides the face plate into modular sections with standardized support locations. This segmentation allows for stable structural design while simplifying manufacturing through modular assembly and standardization of components.
6Device complexity
If manual operation mechanism is used, then device complexity is reduced, but burring and safety issues occur at operator interaction points
Solution Approach 1:
The patent designs the manual operation mechanism with self-protecting features. The lifting mechanism includes rounded edges and smooth surfaces that prevent burring formation, and the spring-assisted lip provides automatic positioning that reduces operator exposure to hazardous moving parts.
Data Source
AI summary
A dock leveler comprises a deck plate and a lip assembly hingedly connected to the deck plate. The lip assembly comprises a lip plate and a lip subplate. The lip plate includes a traction side and a bottom side and has a lip plate crown. The lip subplate includes a top side and a bottom side and has a lip subplate crown. The lip subplate is coupled to a bottom side of the lip plate in a manner that provides structural rigidity to the lip plate. The lip subplate crown is aligned and nested with the lip plate crown.