Abstract: A robotic cleaner includes a housing, a suction conduit with an opening, and a leading roller mounted in front of a brush roll. An inter-roller air passageway may be defined between the leading roller and the brush roll wherein the lower portion of the leading roller is exposed to a flow path to the suction conduit and an upper portion of the leading roller is outside of the flow path. Optionally, a combing unit includes a plurality of combing protrusions extending into the leading roller and having leading edges not aligned with a center of the leading roller. Optionally, a sealing strip is located along a rear side of the opening and along a portion of left and right sides of the opening. The underside may define side edge vacuum passageways extending from the sides of the housing partially between the leading roller and the sealing strip towards the opening.

Abstract: An identification badge is shown and includes a washable worker identification badge including a photograph of a worker using the garment, wherein an image from the photograph is sublimated or printed on the badge. In one embodiment the badge includes a security device providing radio frequency identification capabilities. According to another embodiment, a garment with a washable worker identification badge is provided. In still other embodiments, a security system and procedure is provided using the badges or garments.

Abstract: An identification badge is shown and includes a washable worker identification badge including a photograph of a worker using the garment, wherein an image from the photograph is sublimated or printed on the badge. In one embodiment the badge includes a security device providing radio frequency identification capabilities. According to another embodiment, a garment with a washable worker identification badge is provided. In still other embodiments, a security system and procedure is provided using the badges or garments.

Abstract: A hollow airfoil (10) for a gas turbine engine having a leading edge (12), a trailing edge (14), a pressure side (20), and a suction side (22) includes a plurality of internal spanwise stiffening ribs (31-35) that are arranged in a logarithmic pattern. The particular arrangement of internal fibs (31-35) optimizes stiffness of the airfoil (10) without significantly increasing the weight thereof.

Abstract: Purge flow openings through chordwise ribs in hollow fan blades are formed by making partial circular cuts at the rib edges before diffusion bonding the blade halves. A full semi-circular section is used on the pressure side, but only a segment of a semicircular section is used on the suction side.