Electric Chain Saw
Our team was motivated to develop a safer chain saw to reduce the potential for accidents and injuries resulting from the exposed spinning chain. We are confident the JawSaw is a safe and reliable alternative to the traditional chain saw and could have a dramatic effect on reducing the current number of chain saw related injuries.
UNIQUE PROPERTIES / PROJECT DESCRIPTION:
Our primary objective was to design a chain saw that is safer for the novice user, but also provides improved ease of use and is better adapted to the specific needs of the homeowner. For the safety concern, the chain is enclosed by a jawguard, which prevents unintended contact with the chain by the user. For improved ease of use, we introduced a proprietary, patented chain tensioning system, which prevents over-tightening of the chain, a common novice mistake, and a self-lubricating chain oiler, which many beginners tend to overlook. Finally, our re-design uses a plunge mechanism to actuate the pivoting blade, making the new design intuitive for even a first-time chain saw user.
OPERATION / FLOW / INTERACTION:
The JawSaw is the easiest way to clean up downed logs and branches. It is the only chain saw designed to operate directly on the ground or pavement so the user does not have to lift branches off the ground to cut. The JawSaw also has extended reach for pruning high limbs.
PROJECT DURATION AND LOCATION:
FITS BEST INTO CATEGORY:
Engineering and Technical Design
PRODUCTION / REALIZATION TECHNOLOGY:
SPECIFICATIONS / TECHNICAL PROPERTIES:
The Chainsaw Re-Invented
In addition to chain saw related injury figures which revealed the potential need for a safer chain saw, the focus of the project has been on understanding the actual homeowner's main applications of chain saws and the ergonomics of chain saw users. We carried out field observation and interviews in various regions including North America, Europe and Australia. That resulted in directions for our designers that went beyond the mere mechanical functionality of the tool. As an example, we noticed the amount of work that is related to cutting logs: users have to lift them off of the ground and then bend down in order to cut them, which puts tremendous strain on the back after repetitive use. With our design, we eliminated the need for all that effort because logs are cut directly on the ground with the user standing in an ergonomic upright position. Also, the user has to have both hands on the tool grips in order to operate the saw, so hands are kept out of blade range anytime it is engaged in a cut.
The internal project brief asked our design and R&D team to develop a safer chain saw to reduce the potential for accidents and injuries resulting from improper use of chain saws by non-experienced home owners and do-it-yourselfers. The brief also challenged the team to provide a new saw design which would provide all of the functions and features required by the novice homeowner user. The team was very excited about this challenge since the chain saw can be an intimidating and dangerous tool for most novice users and also the basic design has not changed since its introduction by Andreas Stihl in 1930’s.
TEAM MEMBERS (4) :
Paolo Andriolo, Positec Italia - Executive Vice President of Global Strategy , Warren Brown , Positec Australia – Director of New Product R&D, Andrea Cestonaro, Positec Italia - Senior Designer and
Esteemed Designer, 2011.