Zero-turn mower front wheel cam and dawg restriction mechanism
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Solution Overview
Problem
Zero-turn lawn-mowers experience uncontrolled turning and speed movements of front wheels while driving on slopes, making them difficult to control.
Innovation Solution
A zero-turn lawn-mower design featuring cams on each front wheel and an actuating rod with a dawg that can be selectively operated by a rod pedal to restrict or allow turning movements, ensuring controlled movements by applying force for straight-ahead direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If zero-turn lawn-mower is designed for maneuverability, then turning capability is improved, but control stability on slopes deteriorates
Solution Approach 1:
The patent implements a dynamic control system where the operator can switch between free-turning mode (for maneuverability) and restricted-turning mode (for slope stability) based on operating conditions. The actuating rod and dawg mechanism dynamically adjust the front wheel's rotational freedom, allowing the system to adapt between two operational states to resolve the contradiction between maneuverability and control stability.
2Speed
If front wheels are allowed free rotation, then turning radius is reduced, but control difficulty on slopes increases
Solution Approach 1:
The mechanism allows dynamic switching between free rotation (fast turning) and restricted rotation (controlled movement) based on slope conditions. The operator can engage the dawg to restrict wheel rotation when on slopes, preventing uncontrolled turning while maintaining the ability to turn quickly when needed on level ground.
3Device complexity
If simple restriction mechanism is used, then device complexity is reduced, but control effectiveness may deteriorate
Solution Approach 1:
The patent introduces an intermediary mechanical linkage system (actuating rod connected to pedal and dawg) that translates operator pedal input into precise restriction of front wheel rotation. This intermediary mechanism provides reliable control effectiveness while maintaining relative simplicity by using direct mechanical connection rather than complex hydraulic or electronic systems.
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
Enables controlled movement and prevents uncontrolled turning of the lawn-mower on slopes by allowing the operator to restrict front wheel rotation, enhancing safety and maneuverability.
Implementation Method 1
a cam (24) mounted on each front wheel (20) and a corresponding dawg (32) extending from an actuating rod (30)
Data Source
AI summary
A Zero-turn lawn-mower that selectively restricts movement of front wheels to achieve controlled movement while on slope is disclosed herein. Lawn-mower includes a mower frame, at least one front wheel disposed underneath mower frame, at least one cam, an actuating rod and a dawg. The cam is fixedly connected to mower frame and in the vicinity of front wheel and is further defined with a notch. Actuating rod of said lawn mower is swivelably connected to mower frame and operable by a driver, typically by a rod pedal. Dawg extends from actuating rod to selectively engage with notch to restrict angular movement of front wheel and selectively disengage from notch to enable angular movement of front wheel. This provides the user to control drift of the mower on an angled or inclined surface. Furthermore, A spring is provided at other end of pedal to reduce tension and provide smooth rotation of actuation rod.