摘要:
A device for guiding torque of one drive shaft (3) connected with a driving appliance (2) onto a first or a second output shaft (4, 5). A torque fed via the drive shaft (3) can be applied, respectively, to one of the two output shafts (4, 5) depending on a control of a changeover device (6). The changeover device (6) comprises one electromagnetic clutch (7) which can produce a power flow between the drive shaft (3) and the first or the second output shaft (4 or 5). The electromagnetic clutch (7) comprises a coupling element (8) which is guided and displaced in an axially and rotatable manner and is fixedly connected with the drive shaft (3) and depending on a current supply of the electromagnetic clutch (7) produces the power flow between the drive shaft (3) and the first or the second output shaft (4 or 5).
摘要:
The invention relates to a method for the case-hardening of higher-molybdenum-alloy sintered steels.It is provided that, immediately after the sintering, the sintered steels are cooled down to a temperature range at which a minimum portion of .gamma.-iron is present in sintered steel and that the sintered steels are subjected to a heat treatment in this temperature range in the presence of carbon.
摘要:
Expression of a multigene RNA having self-splicing activityAn RNA is expressed which can release two or more active genes by means of inserted ribozyme structures. The expression can be carried out in plants or other organisms.
摘要:
A device having cores of metal oxide ceramic (for example, Y-Ba-Cu-O) for limiting a short circuit current in power supply systems. The concept provides that a choke core, when operated at a rated current, is superconductive and its shielding currents keep the resulting inductance in the choke at a low level. In the event of an overload, the winding of the choke generates a correspondingly high magnetic field in the core which puts the core into the normally conducting state. This causes the shielding currents to disappear in connection with a rise in the resulting inductance, thus limiting the current. In order to realize a particularly high inductance in the normally conductive case, the superconductive choke core may be made hollow and may be filled at least in part with a ferromagnetic material.
摘要:
An apparatus for clamping workpieces which have to be machined by a machine tool. The apparatus comprises a rectangular frame including two longitudinal frame members and two transverse frame members. Clamping means are provided to fix the workpieces to be machined to said rectangular frame. The clamping means comprise at least one auxiliary frame which is removably inserted in said rectangular frame. Each of the auxiliary frames includes two clamping bars which can be adjustably connected to each other and the ends thereof being adapted to be connected to the longitudinal frame members of the rectangular frame such that they are adjustable in the longitudinal direction of the longitudinal frame. The clamping bars comprise a plurality of continuous threaded bores running essentially perpendicular to the clamping bars, said bores being enlarged to a predetermined nominal diameter and said bores being adapted to selectively receive a clamping screw.
摘要:
The invention provides an apparatus for fixing a workpiece to be machined by a machine tool to the worktable of the machine tool in an exactly determined positional relationship with reference to a reference point located on the worktable of the machine tool. The apparatus of the invention comprises a workpiece receiving means adapted to removably receive the workpiece to be machined, and first positioning means comprising a first group of positioning apertures provided in the workpiece receiving means, and a first group of positioning studs provided on the worktable of the machining tool, said first group of positioning apertures and said first group of positioning studs cooperating to determine the position of the workpiece receiving means in X- and Y-direction.Further, there are provided second positioning means comprising a second group of positioning apertures and a second group of positioning studs, said second groups of positioning apertures and positioning studs being located distantly from said first groups of positioning apertures and positioning studs and cooperating with each other. The cooperating second groups of positioning apertures and positioning studs determine the position of the workpiece receiving means either only in X-direction or only in Y-direction, but not simultaneously in both directions.
摘要:
The invention provides a manufacturing jig to precisely position a workpiece with reference to a workpiece receiving means. The jig comprises a workpiece supporting member to which the workpiece is fixed and a receiving member on which said workpiece supporting member is releasably mounted. The receiving member comprises two registering pins protruding from one surface thereof. The workpiece supporting member comprises two centering apertures adapted to engage the two registering pins upon mounting the workpiece supporting member on the receiving member. The two centering apertures are located distantly to each other. The first centering aperture has a fixed position with reference to the workpiece supporting member and the second centering aperture is displaceable with reference to the workpiece supporting member in a direction along a tie line between the centers of the first and second centering apertures, but movable in a direction running perpendicular to said tie line.
摘要:
An apparatus for clamping non-rotating work pieces which have an elongate portion or an elongate shank with polygonal, preferably square cross section, comprising a clamping body member with a hollow clamping chamber provided therein, which has a corresponding polygonal cross section. The chamber has at least one opening through which the work piece may be inserted. Clamping members are provided to clampingly fix the work piece in the clamping chamber. To define the position of the work piece at least in X- and Y-direction as well as with regard to its angular orientation, the clamping chamber is provided with a first web and a second web each projecting from a first inner side wall towards the interior of the clamping chamber and arranged in a certain distance from each other, and a third web projecting from a second, adjacent inner side wall towards the interior of the clamping chamber. The clamping members are located essentially opposite to the first and third webs such that it clamps the work piece inserted into the clamping chamber towards the first, second and third webs. The apparatus is particularly suitable to clamp electrode blanks and finished electrodes used in an electro erosive machining apparatus where high positional accuracy is required, even if the work piece is repeatedly inserted and removed from the apparatus.
摘要:
The invention refers to a tool assembly for cuttingly machining of an at least partially closed inner surface of a workpiece, e.g. a bore. It comprises an essentially rod-shaped tool support having a machining tool mounted on its end and which is adapted to be inserted into the cavity to be machined. The tool support comprises a rod member with a continuous opening extending in axial direction and with parallel supporting surfaces arranged in the region of the both ends and extending with an angle to the longitudinal axis of the rod member. A machining tool supporting member having a machining tool mounted at one end is slidably mounted at one end of the rod member and rests against the first supporting surfaces of the rod member. A control member is slidably mounted at the other end of the rod member perpendicularly to the axis of the tool support and resting on the second supporting surface, serving for the pushing-out and retiring of the tool supporting member. To this purpose a connecting member extending through the opening of the rod member is provided, being connected, with its one end, to the machining supporting member and, with its other end, to the control member, thereby coupling these elements together in a predetermined distance.
摘要:
An electrically heated steam iron operable by a drip system includes a drip valve arranged to have a variable rate of flow of water therethrough, and a water tank the interior of which is vertically divided into two chambers and by a partition wall, the two chambers being in flow communication with each other via an opening. A vaporizing chamber is disposed below the drip valve. A vertically adjustable slide member is arranged to slide relative to the partition wall while being sealingly engaged therewith, and adjustment means comprising a valve rod is connected to the slide member. The valve rod passes through a top surface of the tank, wherein vertical adjustment of said slide member by means of the valve rod is effective to vary the height of the column of water above the drip valve, thereby adjusting the rate of flow of water.