Sidewalk Drop Spreader Movable Hopper Wall Agitation
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Solution Overview
Problem
Existing granular material spreaders, particularly drop spreaders, face issues with precision control, material bridging, high power demand, noise, and increased maintenance due to the need for secondary agitators or vibrators when spreading deicing materials like salt, leading to inefficient and costly operations.
Innovation Solution
An electrically powered sidewalk drop spreader with a novel agitation system that uses a 12-volt DC gear motor to actuate a moveable hopper wall, eliminating the need for internal augers or vibrators, and featuring a wireless control system for efficient and precise material dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secondary agitator or vibrator is added to assist material flow for deicing materials, then material flow reliability is improved, but device complexity and power demand increase
Solution Approach 1:
The patent combines the agitation function with the hopper wall itself, making the hopper wall both a structural containment element and an active agitation element. The movable hopper wall serves dual purposes: containing material when stationary and agitating material when moved, eliminating the need for separate agitator components.
Solution Approach 2:
The hopper wall is designed to perform multiple functions: structural containment, material agitation through movement, and flow control. This multi-functional design replaces what would traditionally require separate dedicated components for each function.
2Reliability
If a secondary agitator or vibrator is added to prevent material bridging, then material flow consistency is improved, but power demand and noise increase
Solution Approach 1:
The agitation function is merged into the hopper wall structure itself. The movable hopper wall uses a single motor to create material flow agitation, eliminating the need for separate high-power agitator motors while achieving the same material flow consistency.
3Reliability
If a secondary agitator or vibrator is added to assist material flow, then material flow is improved, but maintenance requirements increase
Solution Approach 1:
The agitation function is integrated into the hopper wall structure, reducing the number of separate moving components. This integration eliminates maintenance issues associated with separate agitator mechanisms while maintaining effective material flow assistance.
4Ease of operation
If a cable-controlled gate is used to regulate material flow rate, then flow control is achieved, but reliability decreases due to corrosion
Solution Approach 1:
The patent replaces the cable-mechanical gate control system with an electric motor-driven movable hopper wall system. This substitution eliminates corrosion-prone cables and mechanical linkages while providing reliable material flow rate control through electrical actuation.
5Area of stationary object
If broadcast spreader is used to disperse material centrifugally, then material spread coverage is improved, but spread precision and uniformity worsen
Solution Approach 1:
Instead of centrifugally throwing material outward from a central point (broadcast method), the patent uses a drop spreader approach that meters material vertically downward through a controlled opening, allowing precise control of spread width and rate by controlling the metering mechanism rather than relying on centrifugal dispersion.
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 reliable, economical, and efficient method for spreading deicing materials with precise control, reduced power consumption, minimal noise, and reduced maintenance, enabling uniform and controlled material distribution on narrow walkways.
Implementation Method 1
an agitation system that uses a 12-volt DC gear motor to actuate a moveable hopper wall
Implementation Method 2
A rotor, which is a cylinder that rotates about a horizontal axis, is typically located in the bottom of the hopper to meter material out of an opening in the bottom of the hopper
Implementation Method 3
which do not flow as easily, the use of gravity alone or light agitation frequently results in the stoppage of flow or 'bridging' of material
Data Source
AI summary
The invention is directed to a sidewalk drop spreader for winter services, which is mountable on a vehicle and includes a hopper. The hopper includes a pair of spaced-apart side walls, each one of which extends parallel to the other one of the side walls, a front wall extending between the side walls, and a rear wall extending between the side walls and being spaced apart from the front wall. The hopper also includes a bottom, which in turn includes a rotatable rotor and a compression roller that extend parallel to one another between said the side walls. An agitation system includes a motor mounted to the hopper, which actuates movement of a selected one of the side walls, front wall, and rear wall.