Abstract: A dynamic seal for a drive shaft including a seal housing with at least one inlet for injecting a fluid, (i.e., a liquid or gas) into the seal. The seal also has an expeller device, such as an expeller ring mounted on the drive shaft, for expelling the injected fluid along the drive shaft in the direction of the casing. In addition, the seal may employ sealing rings positioned to prevent the injected fluid from escaping the seal in a direction other than along the shaft toward the casing, such as a glass-filled PTFE ring positioned proximal to the expeller device and a seal adjuster for compressing a graphite-yarn packing ring against the glass-filled PTFE seal ring. Further, the seal may additionally or alternately include a fitted sleeve covering the drive shaft to protect the shaft from wear and corrosion.

Abstract: In a sanding apparatus (10) including a drive roll (14), at least two feed rolls (16, 18), a guide roll (20) and an endless belt (12) arranged to engage each of the feed rolls to thereby define a closed loop; and an elongated smoothing bar (30) located between the two feed rolls with a back side of the belt passing over the smoothing bar, an improvement wherein the smoothing bar is constructed of an elongated metal bar having a mounting face (36), a belt face (34) and a pair of side faces (38, 40). At least one cooling passage (42) is formed in the bar and extends longitudinally from one end of the bar to the other. A plurality of air shower holes (46) are arranged to discharge cooling air onto the back side of the endless belt (12).