Abstract: A stem cell which is obtainable from the non-embryonic tissue isolated from the dental follicle of tooth or wisdom tooth which are able to differentiate into a periodontal ligament like membrane structure.

Abstract: A stem cell which is obtainable from the non-embryonic tissue isolated from the dental follicle of tooth or wisdom tooth which are able to differentiate into a periodontal ligament like membrane structure.

Abstract: In a piston pump for providing high-pressure fuel in a common-rail fuel injection system including a camshaft (2), which is mounted rotatably in a pump housing (1) and which has at least one eccentric cam 93) for operating a pump piston (4, 14) in an approximately radial direction with respect to the camshaft (2), in order to reduce the wear of the piston pump, a piston-rod element (6, 16, 26, 36, 46) is arranged between each pump piston (4, 14) and the eccentric cam (3) so as to transmit the stroke movement (5) and the force from the eccentric cam of the camshaft (2) to the pump piston (4, 14) by a rolling movement.

Abstract: In a piston pump for providing high-pressure fuel in a common-rail fuel injection system including a camshaft (2), which is mounted rotatably in a pump housing (1) and which has at least one eccentric cam 93) for operating a pump piston (4, 14) in an approximately radial direction with respect to the camshaft (2), in order to reduce the wear of the piston pump, a piston-rod element (6, 16, 26, 36, 46) is arranged between each pump piston (4, 14) and the eccentric cam (3) so as to transmit the stroke movement (5) and the force from the eccentric cam of the camshaft (2) to the pump piston (4, 14) by a rolling movement.

Abstract: An injector for a fuel injection system is provided with an injector housing in which a piezoelectric stack is located and with a valve housing connected with the injector housing in which a valve closing device with a jet needle is displaceably located. The valve closing device can be actuated by the piezoelectric stack. The valve closing device can be reset by a return device. A hydraulic following amplifier is located between the piezoelectric stack and the jet needle of the valve closing device. The amplifier has a displacement piston actuated by the piezoelectric stack. A control piston located downstream from the displacement piston and increases the displacement travel. A working piston that actuates the jet needle and increases the actuating force.

Abstract: In a valve for the dosed discharge of fluids particularly a fuel injection valve for fuel injection systems of internal combustion engines, the valve includes in an valve housing at the front end of an injector housing a valve structure at a fluid discharge end of the valve housing and a stack of piezo elements disposed in the opposite end of the injector housing and a high pressure fluid passages leads to the fluid discharge end which is isolated from the area in which the stack of piezo elements is disposed and which is in communication with a low pressure drain passage such that the piezo elements are not exposed to the high pressure fluid. Isolation is obtained by a compensation cylinder movably disposed in an annular space between, and in sealing relationship with, the valve housing, the piezo stack being enclosed in a piezo guide tube which is sealingly connected to the valve housing.

Abstract: In a piezo-control valve for fuel injection systems of internal combustion engines wherein a piezo-ceramic actuating rod is mounted with one end firmly to one end of a valve housing having a nozzle body with a valve seat disposed at the other end and a nozzle control needle is disposed in the nozzle body and pressed by the piezo-ceramic actuating rod onto the valve seat in the nozzle body when the piezo-ceramic actuating rod is not activated, the valve housing includes a sleeve-like portion disposed around the piezo-ceramic actuating rod which consists of a material compensating for temperature-caused changes in the length of the piezo-ceramic actuating rod.

Abstract: The annular gap-type ball mill for the continuous pulverization in particular of hard mineral substances comprises a closed grinding container (12) driven rotatingly and accommodating a rotor (13) driven in opposite direction. The outer surface of the rotor defines with the inner face of the grinding container (12) a grinding gap (20) which may contain grinding pellets.

Abstract: The invention relates to an annular gap-type ball mill for continuously pulverizing in particular mineral hard materials comprising an upright grinding container closed by a cover, and housing a rotor whose cone-shaped outer surface limits with the cone-shaped inner surface of the grinding container a grinding gap communicating with a feed aperture and containing grinding pellets, the rotor having a top portion being adapted in its shape to the inner surface of the cover, and including within its range a discharge opening. The annular gap-type ball mill is characterized in that the top portion of the rotor is conical to limit with the cone-shaped cover an annular discharge gap whose lower end of maximum diameter ends in an annular chamber at the open upper end of the grinding gap. The grinding pellets are prevented from sinking down in the grinding gap of which 100% are utilized for the grinding operation so that the residence time required for the pulverization of the mineral hard materials is reduced.

Abstract: A hydraulic injection-adjusting device for high pressure injection installations in auto-igniting internal combustion engines. Oil is supplied to operating chambers of the injection-adjusting device by means of a pressure supply pump with an electrically actuatable regulating valve being provided for controlling the flow of oil to inlet of the operating chambers. An electronic control unit is supplied on an input side which signals corresponding to current engine operating parameters with the control unit yielding on an output side thereof a desired value for the regulating valve to apply pressure in a controlled fashion to the injection-adjusting device. An arrangement is provided for measuring the actual value of the adjustment angle at the injection-adjusting device by constant answer-back line provides a feed of the actual value to the control unit.

Abstract: A flexible bonnet portable hair dryer including two separate combination blower and heater units. A flexible U-shaped collar support is connected to the combination blower and heater units and to a lower edge of the bonnet.

Abstract: The housing of a blow dryer has a slender handle shaped to be held in the hand and formed with a pair of windows on the back side, and a large head formed with an outlet. A blower motor is mounted in the handle and carries a fan in the head which blows air past a heater through the outlet. A control circuit housed in the handle is connected to a pair of control elements mounted rotationally on the motor casing and operable through the windows at the back of the handle. One of these controls varies the motor speed and the other establishes the output temperature. The two adjustment members are rotatable about the motor axis, with the temperature-adjustment member formed with teeth connected to a gear carried on a potentiometer and the motor-speed adjustment member connected via an axially extending finger to a motor-speed switch.

Abstract: A hair dryer comprising a generally tubular housing including twogenerally semi-cylindrical grip parts having edges including complimentary grooves and projections which engage each other to secure the grip parts together, the housing accommodating a heating device, a motor and an air transport device therein, a first end grid which is mounted over an intake opening on one end of the housing to secure the grip parts to the first grid as well as to each other, and a second end grid mounted over an exhaust opening at the other end of the housing to secure the semi-cylindrical grip parts to the second grid as well as to each other.