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Dahlheimer

John C. Dahlheimer, Laconia, NH US

Patent application numberDescriptionPublished
20080258406Radial Shaft Seal with Large Radial Offset Accommodation - A radial shaft seal is provided for accommodating large radial offset of the shaft relative to a housing. The seal includes an annular retainer insert provided for engaging the seal to a fixed housing. An annular elastomeric seal body is molded to the retainer insert and includes flexible axially extending portion extending from an inner surface of the retainer insert. A seal portion extends axially from a radially inward end of the radially inwardly extending portion and includes a seal lip with a garter spring disposed radially outward of the sealing lip and an elastomeric bearing surface disposed adjacent to the sealing lip. The bearing surface includes a plurality of raised pads adapted to engage the shaft. The pads each include a rounded edge on lateral sides thereof for encouraging the creation of a lubricating film between the pads and shaft. The pads are lubricated by direct exposure to the fluid being sealed.10-23-2008
20080284110Prelubricated Multi-Lipped Radial Shaft Seal With Large Radial Offset Accommodation - A radial shaft seal is provided for accommodating large radial offset of the shaft relative to a housing. The seal includes an annular retainer insert provided for engaging the seal to a fixed housing. An annular elastomeric seal body is molded to the retainer insert and includes a flexible axially extending portion extending from an inner surface of the retainer insert. A seal portion extends from a radially inward end of the flexible portion and includes first and second seal lips and an elastomeric bearing surface disposed between the first and second sealing lips. The bearing surface includes a plurality of raised pads adapted to engage the shaft. The pads each include a rounded edge on lateral sides thereof for encouraging the creation of a lubricating film between the pads and shaft. The pads are lubricated by a lubricant disposed in a lubricant chamber disposed between the first and second seal lips.11-20-2008
20090261650Unitized Seal With Integral Spacer - A unitized seal assembly is provided for installation between linkages of a chain drive designed for tracked vehicles. The seal assembly facilitates field preventative maintenance on the drive chain by utilizing an integral spacer that holds the critical sealing surfaces together at all times, and has a seal head that can be easily removed from the outer link bore of a chain link. Removal of the seal head from the outer link bore causes as-installed clearance passageways between the seal head and seat portions and the spacer to forcefully close and prevent abrasive particles from getting inside the seal and reaching the interior interface junction of the dynamic sealing surfaces during seal maintenance. The seal assembly also includes additional sealing features that provide improved performance.10-22-2009

Patent applications by John C. Dahlheimer, Laconia, NH US

Stefan Dahlheimer, Kleinostheim DE

Patent application numberDescriptionPublished
20100081363DEVICE FOR MACHINING A DIE PLATE OF AN EXTRUDER - Methods and devices for machining a die plate of an extruder for pelletization are provided. The device can include a grinding wheel with a grinding surface rotatably disposed on a drive mechanism of a cutter head associated with the extruder. The grinding surface can include a hard coating aligned with the die plate.04-01-2010
20100289166DROP PELLETIZING DEVICE AND METHOD FOR THE OPERATION THEREOF - A drop pelletizing device and method for producing pellets from a low-viscosity plastic melt are provided. The drop pelletizing device can include a die plate with holes, in which the plastic melt can be subjected to a harmonic pressure oscillation such that the plastic melt emerging from the holes forms individual pellet droplets, a pressure vessel, in which prevails an overpressure above the ambient pressure, a discharge device adapted to discharge the individual pellet droplets from the pressure vessel and to reduce the overpressure, a separator adapted to separate the individual pellet droplets from the coolant; and at least one circulating device adapted to agitate the coolant to separated and unclump the individual pellet droplets in the coolant and for producing turbulence within the coolant.11-18-2010
20110061261DRYING APPARATUS FOR DRYING PELLETS - One or more embodiments of a drying apparatus for drying pellets from a process fluid are provided. The drying apparatus can include at least one screen device. The at least one screen device can have a screen area with screen openings. The drying apparatus can also have an oscillating device that sets at least the screen area of the screen device into oscillation. The oscillations can move the pellets relative to the screen openings, and the process fluid can drain off through the screen openings.03-17-2011
20110062262SHREDDER FOR PRODUCING PARTICLES FROM A SHEET MATERIAL - A shredder for producing particles from a sheet material is disclosed herein. The shredder can have a longitudinal cutting device with a first cutting roller and a second cutting roller. A transverse cutting device can be positioned after the longitudinal cutting device. The first cutting roller and the second cutting roller can each have special profiles.03-17-2011
20110215494DEVICE AND METHOD FOR CONTINUOUS CASTING AND GRANULATION OF STRANDS FROM THERMOPLASTIC - The invention relates to an apparatus for continuous casting and granulating strands of a thermoplastic material which uses a nozzle head having a plurality of nozzle apertures of a maximum diameter of 4 mm each, and water-moistened guide means for cooling and guiding the plastic strands exiting the nozzle aperture via inlet rollers to the inlet of the cutting unit for chopping up the plastic strands into granules approx. 2-3 mm in length. The flow rate of the melt, with the strands being cooled down on their way from the nozzles via the guide means to the feed rollers of the cutting unit, of at least 100 nm/min in the central spatial region of the nozzle apertures will be increased to such an extent that the cutting unit will chop up the strands at a cutting rate of >2,000 cuts/s.09-08-2011

Patent applications by Stefan Dahlheimer, Kleinostheim DE