Abstract: A lawn mower having an endless cutting band guided across a slotted cutter bar to cut grass projecting through the slots. Drive means moves the cutting band continuously in one direction.

Abstract: A piston comprising a head, a pair of opposed boss-carrying elements depending from the head and a pair of opposed skirt portions separated from each other and from the head. The skirt sections are supported from the boss-carrying elements by upper and lower pairs of struts each joined at one end to an adjacent skirt section and at the other end to an adjacent boss-carrying element. The end portions of each strut of the lower pair form an angle of between about 90.degree. and 180.degree.. The end portions of each strut of the upper pair form a substantially smaller angle than the end portions of the struts of the lower pair. The lower struts are stiffer than the upper struts.