AFTech (lawn mowers)
One of the most common customer wishes when it comes to lawn mowers with collecting bins is to minimize the number of times the bin has to be emptied. In order to fill it properly, and avoid clogging the chute, grass needs to be tossed in as far as possible – which is more complex than it may sound. First, the airstream that leads to the bin has to be even and unrestricted at all times. Second, the grass must be thrown at a perfect angle and velocity to make it merge with the airflow.
“Our patent pending AFTech was developed to minimize all resistance in the distance between the cutting blades and the collecting bin, which was achieved in three crucial steps. Computational fluid dynamics was used to optimize airstreams by matching the shape of the cutting blades with the interior hood design, hands-on experiments revealed the best place for the cutting deck hole and numerous chute angles were carefully evaluated. The result? The most efficient grass collecting to date,” says Jörgen Johansson, R&D Group Manager Product Design.
Air Injection (chainsaws)
Just as lawn mower users want to minimize the interruption of having to empty collecting bins, chainsaw users want to spend as little time as possible cleaning air filters. Getting dust particles inside the mechanics of a chainsaw does not only mean more downtime, it also means more wear and tear. In 1986 however, Husqvarna became a pioneer in this field by offering a new way of making the air as clean as possible even before it reaches the air filter. In fact, the new innovation – called Air Injection – made it at least 97 per cent dust free when used in normal conditions.
“The secret lies in the shape of the channel around the flywheel that helps separate heavy dust particles from lighter air molecules. Using the centrifugal force, 97 per cent of all debris is removed before it hits the filter. When we received the patent, this type of technology has not been used in chainsaws yet, which made our work even more exciting. Most users went from having to clean their filters once or twice a day to approximately just once a week – in an instant,” says Dan Ericsson, Central R&D Manager.
Boundary Wire System and GPS Assisted Navigation (Husqvarna Automower®)
Husqvarna’s iconic signature product, the robotic Husqvarna Automower®, has offered spare time to gardeners all over the world since 1995. When it comes to patents, the quiet and emission-free robot mower is fully loaded. However, an important and early example is actually found outside the product itself.
Husqvarna’s unique boundary wire system enables Husqvarna Automower® to move freely within its boundaries, constantly cutting from different angles and therefore leaving a carpet-like finish. Besides that, Husqvarna’s wire system prevents track marks like no other competitor on the market. Husqvarna Automower® has three different ways of returning to the charging station. It can follow the guide or boundary wire, either closely or from a distance – or it can simply set course for the magnetic fields that surround the station. By alternating between these options each time it’s time to recharge, track marks along the wires are kept at a minimum.
“Another favorite is the patent pending GPS Assisted Navigation found in the 330X model. During the first couple of work days, the mower creates its own digital map of the lawn and registers how much energy has been put into each section. The map is then used to further ensure that all areas get the same amount of attention, without having to pre-program the mower,” says Oscar Holmberg, Product Manager Robotic Mowers.