Dock Leveler Lip Extender and Counterbalancing Spring Design
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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 design incorporates a deck plate with a lip assembly featuring a lip subplate for structural rigidity, a pivot anchor to reduce material costs and internal loads, a counterbalancing assembly with uniform spring constants, and a friction-increasing coating on traction surfaces to enhance safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conical-ended springs are used to facilitate attachment, then attachment is easier, but material costs increase and manufacturing complexity increases
Solution Approach 1:
The patent removes the conical end feature from the spring design, extracting the problematic element that caused manufacturing difficulties. The spring is designed with a standard cylindrical end that can be attached using conventional methods, eliminating the need for specialized conical machining while maintaining attachment functionality.
Solution Approach 2:
The patent employs standard, readily manufacturable spring components instead of custom conical-ended springs. By using conventional spring designs with cylindrical ends, the system achieves cost-effectiveness through standardization and reduced manufacturing complexity, accepting that the springs are replaceable components.
2Ease of operation
If conical portion is added to spring, then attachment is facilitated, but spring constant varies and decreases across the conical portion
Solution Approach 1:
The patent applies uniform cylindrical geometry throughout the spring design, ensuring consistent cross-sectional area and uniform spring constant along the entire length of the spring. This eliminates the varying spring constant problem associated with conical portions while maintaining localized attachment features through standard cylindrical ends.
3Strength
If face plate is extended lower to provide support, then structural support is improved, but material costs increase and internal loads increase
Solution Approach 1:
The patent divides the support structure into separate functional elements: the face plate provides frontal support, while additional support members (such as vertical stiles or braces) provide lateral and bottom support. This segmentation allows each component to be optimized for its specific function, reducing overall material usage while maintaining structural integrity.
Solution Approach 2:
The patent employs composite construction techniques, combining different materials with complementary properties to achieve optimal strength-to-weight ratio. This may include using thicker materials in high-stress areas and thinner materials in low-stress areas, or combining metals with reinforcing polymers, to reduce overall material costs while maintaining structural support.
4Adaptability or versatility
If manual operation is used, then operational flexibility is maintained, but burring occurs at interaction points and operator fatigue increases
Solution Approach 1:
The patent incorporates protective features such as rounded corners, chamfers, and padded interaction surfaces at points where operators manually handle the dock leveler. These pre-designed protective elements prevent burring and reduce the risk of injury during manual operation, while maintaining the flexibility of manual control.
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 improves weight distribution, reduces material costs, simplifies manufacturing, enhances operational safety, and provides reliable traction and durability on dock leveler surfaces, addressing the inefficiencies and safety concerns of existing systems.
Implementation Method 1
The counterbalancing assembly includes a spring configured to counterbalance the dock leveler assembly
Implementation Method 2
applying a coating to the traction surface... the friction-increasing particles being applied as a part of the powder coating to the dock leveler... curing the coating on the traction surface... to increase friction on the traction surface
Data Source
AI summary
A dock leveler comprises a face plate disposable adjacent a dock wall, a deck plate hingedly connected to the face plate, a lip assembly hingedly connected to the deck plate. The dock leveler further comprises a lip extender support coupled to the face plate, and a lip extender. The lip extender has a first end rotatably coupled to the lip assembly, and a second end selectively engageable with the lip extender support to extend the lip assembly with respect to the deck plate.