Ergonomic Pull Start Handle Structure for Secure Cord Replacement
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Solution Overview
Problem
Existing engine pull start handles are difficult to grip and uncomfortable, making it hard to start engines, and replacing them is also challenging due to the risk of the recoil cord being recoiled back into the engine without an attached handle.
Innovation Solution
A handle with an ergonomic design featuring a U-shaped tubular member, elastomeric surfaces, and a secure mechanism to attach to the recoil cord, allowing for easy replacement without the cord being accidentally recoiled into the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional pull start handle is used, then the engine can be started, but the handle is difficult and uncomfortable to grip
Solution Approach 1:
The handle is divided into multiple components: a U-shaped tubular member, a separate elastomeric grip surface, and a cord attachment mechanism. This segmentation allows each part to be optimized independently - the tubular member provides structural support while the elastomeric surface provides comfort, resolving the contradiction between ease of operation and device complexity.
Solution Approach 2:
The handle combines different materials - a rigid U-shaped tubular member (likely metal or hard plastic) with a separate elastomeric grip surface. This composite structure provides both the structural integrity needed for operation and the comfort of a soft grip surface, directly addressing the grip comfort issue while maintaining structural strength.
2Ease of repair
If an existing handle is severed from the cord for replacement, then a new handle can be installed, but the entire cord may be recoiled back into the engine without any attached handle
Solution Approach 1:
The cord attachment mechanism is designed to be engaged with the cord before the old handle is completely removed. The U-shaped tubular member allows the cord to be threaded through and secured in advance, preventing the cord from being accidentally recoiled into the engine during the replacement process. This preliminary action ensures reliability while maintaining ease of repair.
Solution Approach 2:
The U-shaped tubular member acts as an intermediary between the cord and the handle grip. It provides a secure attachment point for the cord while allowing the handle to be easily removed and replaced. This intermediary structure ensures that the cord remains securely attached throughout the replacement process, preventing accidental recoiling.
3Ease of manufacture
If a simple handle design is used, then manufacturing is easier, but the handle is uncomfortable to grip
Solution Approach 1:
By separating the handle into a simple U-shaped tubular member and a separate elastomeric grip surface, the manufacturing process is simplified. The tubular member can be produced using basic forming processes, while the elastomeric surface can be molded separately and attached. This segmentation maintains ease of manufacture while providing comfortable grip characteristics.
Solution Approach 2:
The elastomeric grip surface functions as a flexible shell that conforms to the user's hand. This thin, flexible layer can be easily molded and attached to the rigid tubular member, providing comfort without complicating the overall manufacturing process. The flexible surface adapts to user anatomy while the rigid structure maintains structural integrity.
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 ergonomic handle provides a comfortable grip and secure attachment to the recoil cord, facilitating easier engine starting and reducing the risk of the cord being recoiled into the engine during replacement.
Implementation Method 1
The handle may include an elastomeric material to provide a comfortable grip
Data Source
AI summary
An apparatus and a method relating to a handle having a neck portion having a throat extending along an axis and having a reduced axial opening and a slit extending along the throat and alongside the axial opening are disclosed.