Downward Biased Dock Leveler Ramp with Lip Lifting Mechanism

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Solution Overview

Problem

Conventional upwardly biased mechanical dock levelers require frequent maintenance and adjustment for their hold down mechanisms to keep the ramp in the lowered position, and they often necessitate physical effort to raise and lower the ramp, whereas downwardly biased dock levelers lack a lock or hold down mechanism but still require effort to manage the ramp's position.

Innovation Solution

A downwardly biased dock leveler with a counterbalance system and lip lifting mechanism that allows the ramp to be raised and lowered with reduced effort, where the lip lifting mechanism engages to support the ramp in a raised position and disengages to allow the ramp to return to a downward bias under its own weight, eliminating the need for additional hold-down mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If upwardly biased mechanical dock levelers are used, then the ramp can be raised automatically with stored energy, but frequent maintenance and adjustment of hold down mechanisms is required

Engineering Contradiction:

Improveautomatic ramp raisingVSAvoidhold down mechanism maintenance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent inverts the conventional upward bias approach by implementing a downwardly biased dock leveler. Instead of using springs or stored energy to automatically raise the ramp, the system uses the ramp's own weight to automatically lower it to the operational position. This inversion eliminates the need for complex hold down mechanisms that require frequent maintenance, while still providing automatic positioning functionality through the counterbalance system.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts and eliminates the hold down mechanism entirely from the system. By removing this problematic component that requires frequent maintenance and adjustment, the design simplifies the overall system while maintaining reliable operation. The lip lifting mechanism replaces the need for hold down mechanisms, providing a more reliable solution.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If downwardly biased dock levelers are used, then hold down mechanisms are eliminated, but physical effort is required to raise and lower the ramp

Engineering Contradiction:

Improveelimination of hold down mechanismsVSAvoidphysical effort to move ramp

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent implements a counterbalance system using springs to offset the weight of the ramp. This counterbalance mechanism reduces the physical effort required by operators to raise and lower the ramp while maintaining the downward bias configuration. The counterbalance springs provide assistance during manual operation, making the system both reliable (without hold down mechanisms) and easy to operate.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Productivity

If conventional dock levelers are used, then the ramp can be positioned for loading, but frequent maintenance of hold down mechanisms reduces productivity

Engineering Contradiction:

Improveloading operation efficiencyVSAvoidmaintenance time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The downwardly biased dock leveler with lip lifting mechanism provides self-service functionality. The system uses its own weight and the lip lifting mechanism to automatically position and secure the ramp in the operational state without requiring manual intervention for hold down adjustments. This self-service capability eliminates maintenance downtime and improves overall productivity by keeping the loading dock operational.

Inventive Principle:

Principle #25Self-service

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 reduces the physical effort required to operate the dock leveler and eliminates the need for frequent maintenance of hold-down mechanisms, as the weight of the dock leveler itself keeps it in the lower position during use, enhancing operational efficiency and reliability.

Implementation Method 1

A downwardly biased dock leveler with a counterbalance system and lip lifting mechanism that allows the ramp to be raised and lowered with reduced effort

Methodology Applied

Scientific EffectSpring: Spring

Implementation Method 2

the lip lifting mechanism engages to support the ramp in a raised position and disengages to allow the ramp to return to a downward bias under its own weight

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Implementation Method 3

allowing the ramp to return to a downward bias under its own weight

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS8407842B2Dock levelers and associated systems and methods

Publication Date: 2013.04.02 4FRONT ENGINEERED SOLUTIONS INC

AI summary

Dock levelers, such as mechanical dock levelers, are described herein. In one embodiment, a mechanical dock leveler includes a ramp having a lip pivotally attached to a forward edge. A ramp lifting system is configured to assist upward rotation of the ramp as it is manually raised. In this embodiment, a lip lifting system is operably coupled to the ramp lifting system so that the ramp is initially “downward biased” prior to being raised, and then becomes at least partially supported in a raised position by the lip lifting mechanism, once the lip lifting mechanism is engaged.