Abstract: A drill chuck and a drill apparatus is provided that includes a drilling machine, which has a motor and a machine spindle that is supported in rotary fashion in a machine housing. The a drill chuck is connected to the machine spindle and can be moved between a clamping configuration and a drilling configuration and has a clamping sleeve and a chuck body in which clamping jaws are movably guided by a threaded connection. When a sliding sleeve is moved relative to the chuck body between a first position that corresponds to the clamping configuration and a second position that corresponds to the drilling configuration, a flow of force traveling from the motor via the machine spindle to the threaded connection is shifted to a flow of force traveling from the motor via the machine spindle to the chuck body and vice versa.

Abstract: A drill chuck having a chuck body, which is produced from plastic, in particular from fibre-reinforced plastic, and has a spindle holder and a tool holder and in which clamping jaws that can be adjusted by a threaded ring are guided. The chuck body has a securing ring on an outer circumference in a region of the tool holder.

Abstract: A drill chuck having a chuck body, on which a threaded ring is guided, which is in engagement with rows of teeth assigned to clamping jaws for the purpose of adjusting the clamping jaws having a thread and guided in the chuck body, as well as comprising a clamping sleeve which surrounds the chuck body and may be coupled with the threaded ring in a torque-transmitting manner and which may be coupled with the chuck body by a locking device. The locking device is formed by a locking sleeve, which has a lock toothing and is rotatably fixedly connected to the threaded ring and which is axially movable between a drilling configuration and a clamping configuration relative to the threaded ring and the clamping sleeve; the locking device is also formed by a mating toothing assigned to the chuck body.

Abstract: A drill chuck having a chuck body, on which a threaded ring is guided, which is in engagement with rows of teeth assigned to clamping jaws via an outer thread for the purpose of adjusting the clamping jaws guided in the chuck body, as well as having a clamping sleeve which surrounds the chuck body and may be coupled with the threaded ring in a torque-transmitting manner. The chuck body is formed in multiple parts from a coupling part having a spindle receptacle and from a jaw guiding part, in which guide receptacles run, inclined toward the chuck axis, for the purpose of guiding the clamping jaws.

Abstract: A method for starting an internal combustion engine in which fuel is injected directly into the combustion chamber using a multiple injection before an initial ignition of a fuel/air mixture, the fuel being injected directly into the combustion chamber during an intake stroke using a first injection and using a second multiple injection, the fuel being injected directly into the combustion chamber during a compression stroke.

Abstract: A computerized prescription process specifying exercise regimens for a patient's chronic condition aids a physician in formulating a prescription and referring the patient to a facility with suitable fitness and health professionals to implement the exercise regimen as medicine for the condition. The system requires minimal time and inputs to access records and process health data unique to a patient, beginning with identification and chronic health conditions to be treated.

Abstract: A power drill has a housing holding a motor and a drive member rotatable about an axis. An arbor extending along the axis outside the housing is rotationally coupled by complementary formations with the drive member. A tube shaft on which is fixed a chuck body holding a plurality of axially displaceable jaws. A sleeve in the tube shaft is rotationally coupled to the arbor. A pusher element braced axially forward against the jaws extends axially rearward into the sleeve, and interengaging screwthreads on the sleeve and pusher element axially displace the pusher element and the jaws on relative rotation of the sleeve and pusher element. A setting sleeve rotationally coupled to the rear end of the tube shaft is axially displaceable between a tightening position engaging a slip coupling on the housing and a drilling position disengaged from the slip coupling and rotationally coupled to the arbor.

Abstract: A power drill has a rotatable spindle extending from a power-unit housing, a chuck body rotationally fixed to the spindle, a jaw guide carried on the chuck body and rotatable relative thereto about the axis, jaws carried in the chuck body, and a pusher element rotatable about the axis in the chuck body and fixed to and bearing axially on the jaws. Screwthreads between the pusher element and the spindle is effective to move the jaws radially on rotation of the spindle about the axis relative to the guide. A coupling sleeve rotationally fixed to the jaw guide is movable between a tightening position rotationally fixed to the housing for movement of the jaws by the pusher element on rotation of the spindle and a drilling position rotationally fixed to the spindle and rotatable relative to the guide for joint rotation of the guide, jaws, and spindle.

Abstract: An apparatus and method provide various desk structures as workstations to receive a user, standing or sitting, walking or stationary, exercising or sedentary. A double duty desk system may include multiple, dedicated “sitting desks” at seated height and fixed to a shared “standing desk,” the height of whose desktop stands accessible to a user exercising on an exercise bike, treadmill, stepper, or the like. A user in an exercise (e.g., standing) position may view materials set on the standing desk and on the attached sitting desks and returns. Heights of desks may be permanently fixed, adjustable, powered, mechanized, manual, or a combination. A user may selectively exercise or sit, in order to read, browse online, attend webinars, edit, monitor, handwrite, type, lecture, listen, answer phones, make calls, develop software, or the like from a standing or sitting position, at will.

Abstract: A drill chuck has a chuck body having a plurality of angularly spaced and axially extending but angled guide grooves each holding a jaw that is axially displaceable between an axially front closed position and an axially rear open position. Each jaw has an outer edge formed with external teeth, and also has an axially rearwardly directed rear face extending at an acute angle to a plane perpendicular to the axis. A ring rotatable on the body about the axis has an internal screwthread meshing with the teeth, and an adjustment sleeve rotationally coupled to the ring is rotatable to move the jaws between the open and closed positions. A cover disk on the rear end of the body is formed with respective throughgoing chip-discharge holes each having an inner end aligned with a respective one of the grooves and an outwardly open outer end.

Abstract: A steady rest has a body juxtposable with a workpiece rotatable about a workpiece axis. Two arm elements are pivoted on the body and carry outer rollers radially engageable with the workpiece. A center element shiftable on the body in a straight line generally radially of the axis carries a center roller engageable radially with the workpiece. The rollers are angularly spaced about the workpiece. An electric actuator mounted on the body is connected by a transmission to the elements for displacing the respective roller radially relative to the workpiece.

Abstract: A power drill shiftable between at least two operational modes has a drill housing, a brushless dc motor in the housing, a drive spindle rotatable about an axis, and a chuck body adjacent the housing. Two elements interconnected by a screwthread are relatively axially shiftable on relative rotation about the axis, and gripping jaws between the chuck body and one of the elements are relatively shiftable radially of the axis on relative axial shifting of the elements. A drive sleeve rotatable by the motor about the axis is connected to the other of the elements. A member is shiftable between positions corresponding to the operational modes of the power drill. A sensor detects which mode the power drill is in, and motor-control means connected between the sensor and the motor adjusts a parameter of the motor as a function of the mode detected by the sensor.

Abstract: A drill chuck has a chuck body centered on an axis, made of plastic, and formed with an axially rearwardly open drive-spindle seat, at least one axially extending slot of ring-segment section opening radially inward into the seat, an axially forwardly open tool-holding cavity, and a plurality of angled jaw guides. Respective jaws are movable in the guides and engaged by a threaded ring axially fixed on the body and rotatable about the axis thereon. A tightening sleeve rotatable about the axis on the body is connected to the ring for rotating same.

Abstract: The invention relates to a method of clamping a tool or a workpiece, using an electric actuator (1) having a housing (2) attached to a work spindle of a machine tool and in which a threaded spindle (3) for moving jaws of a chuck is axially displaceable, and an electric servomotor (4) having a rotor connected with a drive wheel (6) that moves a nut (7) on the threaded spindle (3), a first sensor being associated with the threaded spindle (3) for detecting the axial position thereof, and a second sensor being associated with the spindle nut (7) for detecting the axial position thereof, and including the method step of determining the position of the threaded spindle (3) by the first sensor when a slight axial force occurs due to contact of the clamping jaws with the tool or the workpiece, and continued movement of the spindle nut (7) until a specified sensor difference (12) between the first sensor and the second sensor is determined by the second sensor.

Abstract: A high-frequency spindle has a tube shaft extending along and rotatable about an axis, a chuck carried on a front end of the shaft, adapted to fit with a tool or tool holder, and a ball cage in the shaft and having a radially extending window. A locking ball os radially displaceable in the window between a holding position engaging in a seat of the tool and a freeing position clear of the seat. An angled surface is engageable radially with the ball, and an actuating rod is axially shiftable and coupled to the cage or to the angled surface. An actuator can axially shift the rod and thereby relatively axially displace the ball and the angled surface and cam the ball with the angled surface into the holding position. A primary spring biases the rod so as shift the ball with the angled surface into the holding position.

Abstract: In order to provide a sealing assembly for a fuel cell stack comprising a plurality of fuel cell units, which are arranged consecutively in a stacking direction, wherein each of the fuel cell units comprises a housing with at least one housing part made of a metallic material, which also has an adequate electrical insulation effect and an adequate mechanical strength at a high operating temperature of the fuel cell stack, it is proposed that the sealing assembly comprises at least one intermediate element made of a metallic material, wherein the intermediate element is soldered to a housing part of a first fuel cell unit at at least one location by means of a metal solder and is secured to a housing part of a second fuel cell unit at at least another location, wherein the intermediate element and/or the housing part of the first fuel cell unit is provided with a coating made of a ceramic material.

Abstract: A drill-chuck body is rotatable about an axis and formed with a plurality of passages opening axially rearward at a rear face of the body and radially outwardly at windows in a side of the body. Jaws displaceable between front and rear positions in the passages each have a row of teeth exposed radially outwardly at the respective windows. A tightening ring rotatable about the axis is formed with an internal screwthread engaged at the windows with the teeth such that rotation of the ring moves the jaws between the front and rear positions. A tightening sleeve fitted around and coupled rotationally to the tightening ring extends axially rearward past the windows. This brace ring is radially inwardly engaged with the body and engages radially outwardly between the windows and the rear face with the tightening sleeve so as to coaxially center it on the body.

Abstract: In a fuel cell stack having a plurality of fuel cell units, which are arranged consecutively in a stacking direction, wherein each of the fuel cell units comprises a housing with at least one housing part made of a metallic material, which has an adequate electrical insulation effect and an adequate mechanical strength at a high operating temperature of the fuel cell stack, a sealing assembly is provided and comprises at least one intermediate element made of a metallic material, wherein the intermediate element is soldered to a housing part of a first fuel cell unit at at least one location by a metal solder and is secured to a housing part of a second fuel cell unit at at least another location, wherein the intermediate element and/or the housing part of the first fuel cell unit is provided with a coating made of a ceramic material.