Progressive-Rate Dock Bumper for Shock-Absorbing Trailer Contact
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Solution Overview
Problem
Conventional dock bumpers transfer shock loads directly to the dock wall or trailer, causing damage due to uneven contact and limited compression capabilities, leading to deterioration over time.
Innovation Solution
A dock bumper with an elastomer spring block featuring a pattern of geometric cavities that provides a progressive spring rate, absorbing energy gradually as the trailer compresses, preventing shock loads from being imparted to the trailer or dock wall by increasing resistance until full compression is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional rubber strips or molded rubber bumpers are used, then the bumper assembly can be simple in construction and easy to manufacture, but the shock loads are transferred directly to the dock wall causing damage and deterioration
Solution Approach 1:
The elastomeric material incorporates a pattern of geometric cavities (porous structure) that progressively collapse under compression, allowing the bumper to absorb shock loads through cavity collapse rather than transferring them directly to the dock wall. This porous structure enables progressive spring rate while maintaining material simplicity.
Solution Approach 2:
The geometric cavities are designed with varying cross-sectional areas that change along the compression direction, creating a progressive spring rate. As compression increases, the cavity geometry changes to provide increasing resistance, transforming the force-displacement characteristics of the bumper material.
2Loss of energy
If the rubber strips are compressed to absorb impact energy, then some shock absorption is achieved, but the rubber undergoes only limited compression and higher loads transfer directly to the dock wall or trailer
Solution Approach 1:
The geometric cavities within the elastomeric material provide progressive collapse mechanisms that extend the compression range. As cavities collapse in sequence from largest to smallest, the bumper absorbs energy over a longer compression distance, preventing premature load transfer to the dock wall or trailer.
Solution Approach 2:
The bumper combines elastomeric material with an embedded geometric cavity pattern, creating a composite structure that exhibits progressive spring rate characteristics. This composite design enables extended compression capability and improved energy absorption compared to solid rubber materials.
3Ease of manufacture
If the rubber strips contact the dock wall unevenly, then the bumper assembly is simple to construct, but the shock loads are not distributed evenly causing concentrated point loads that damage the dock wall
Solution Approach 1:
The geometric cavity pattern is precisely controlled during manufacturing to ensure uniform distribution throughout the elastomeric material. This controlled porosity ensures even load distribution across the entire bumper contact area with the dock wall, preventing concentrated point loads while maintaining manufacturing simplicity.
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 progressive spring rate design effectively absorbs impact energy, preventing damage to the trailer and dock wall by distributing loads evenly and providing a 'hard stop' for the trailer, thus protecting both from repeated shocks.
Implementation Method 1
an elastomeric material defining a pattern of geometric cavities. The cavities are configured to provide a progressive spring rate
Implementation Method 2
The geometric cavities can provide an increasing spring rate as a trailer compresses the bumper. The energy of the trailer impacting the bumper may be gradually absorbed
Data Source
AI summary
A dock bumper for a loading dock includes a rear mounting plate for use in securing the dock bumper to a loading dock wall, a front contact surface configured to engage a vehicle backing into the loading dock, and an elastomer spring block positioned between the rear mounting plate and the front contact surface. The elastomer spring block includes an elastomeric material defining a pattern of geometric cavities. The geometric cavities are configured to provide a progressive spring rate in a longitudinal direction relative to the loading dock.