Abstract: Write head coils for magnetic disk systems are commonly formed through electroplating onto a seed layer in the presence of a photoresist mask. It is then necessary to remove the seed layer everywhere except under the coil itself. The present invention achieves this through etching in a solution of ammonium persulfate to which has been added the complexing agent 1,4,8,11 tetraazundecane. This suppresses the reduction of Cu++ to Cu, thereby increasing the dissolution rate of copper while decreasing that of nickel-iron. Two ways of implementing this are described—adding the complexing agent directly to the ammonium persulfate and introducing the 1,4,8,11 tetraazundecane through a dipping process that precedes conventional etching in the ammonium persulfate.

Abstract: A clamping apparatus for fixing and non-rotatably clamping threaded shafts, particularly threaded shafts used as electrodes for eroding threads, comprises a hollow cylindrical shaft with a clamping sleeve member located at its front end. The clamping sleeve member has a central bore and a rectangular aperture opening into that central bore. A rectangular clamping member is slidably received in the aperture and comprises at its front surface, facing the central bore, a number of thread convolutions matching the thread convolutions of the shaft to be clamped. For moving the clamping element towards a threaded shaft received in the central bore, a rotating collar is provided, located around the outside of the clamping sleeve member, and having a an inner circular surface with a diametrically gradually enlarging recessed portion into which the clamping element protrudes.

Abstract: A tapered polygon coupling for an impeller and pinion. The pinion has a tapered bore having a polygonal cross-section. The impeller includes a corresponding tapered polygon plug configured to be placed in the bore of the pinion. A fastener is provided for securing the impeller to the pinion. The fastener passes through a passage in the plug of the impeller. The plug of the impeller is split so that when the fastener is inserted into the passage the plug expands to contact the bore and create an interference fit between the pinion and the impeller.

Abstract: A mechanical locking connector having a wedge, a wedge receiver, and an actuator. A wedge aligns closely to the interior of a wedge receiver and is forced by an actuator to expand opposing sides of the wedge receiver outwardly to frictionally engage any suitably shaped receptor having two corresponding opposing engageable sides.

Abstract: A mounting assembly for mounting a pump to a fluid cylinder comprising a tie rod threaded at one end and providing a second end drivingly engageable with a sleeve-like threaded connection for clamping attachment directly into the cylinder block by the direct thread engagement of the connector internally of the cylinder block. The invention eliminates the requirement of machining a fluid cylinder block to provide engageable flanges and form nut pockets, thereby minimizing fabrication time and costs, while increasing strength, stability and alignment accuracy between pump pony rods and plunger assemblies of fluid cylinders generally of the type used for high pressure industrial applications.

Abstract: A device for connecting structural components (10, 12), with a base part (16; 116), which is disposed at the one structural component (10), a spacer (18; on 118), which is in threaded engagement with the base part (16; 116) and is supported with one end at the other (12) structural component, and a connecting screw (20), which is inserted frictionally engaged through the spacer (18; 118), wherein the spacer (18; 118) is surrounded by any jacket (32; 126) of a softer material, preferably of a plastic which, at least in the state, in which the spacer and the base part together have the smallest axial dimension, is flush with the front surface of the spacer (118) or of the hard core (50) of the same or protrudes with respect to this front surface.

Abstract: A holding connector system is provided for connecting a microdevice feeder to an assembly line table having a plurality of alignment pins. A connector body having a slot provided therein engages one of the plurality of alignment pins and a table recess in the connector body holds it to the assembly line table. A threaded knob secures the connector body to the assembly line table. The microdevice feeder is provided with an alignment plate, which has fingers engaging the alignment pins to cause the microdevice feeder to be properly aligned with the assembly line table. A clamping plate on the microdevice feeder engages a portion of the connector body, which holds down the microdevice feeder.

Abstract: Replacement of a damaged post for a parking meter can be accomplished by cutting the post off near the ground and affixing a replacement post to the stub of the original post with a retaining device which grips the two portions of the post from inside the post. The retaining device is only reachable through the post when the meter head is removed, thus preserving the integrity of the post from vandals.

Abstract: A high-pressure apparatus with driving device (10) and pressure generating device (30) has a frame configuration (20) through which the driving device and the pressure generating device are connected but detachable (FIG. 1A).

Abstract: A dowel including an anchor rod (2) provided at front, in a setting direction, end with a head portion (4) widening in the setting direction, and a sleeve (5) having a through-bore and axially displaceable along the anchor rod, with the sleeve (5) having, at its end adjacent to the head portion (4) an expansion region (6) formed by a plurality of expansion tabs (7) separated from each other by substantially axially extending slots (8) and radially expandable upon a relative displacement of the sleeve (5) and the anchor rod (2), and a sleeve section adjoining the expansion region (6) and having, in its rear end region (10), a larger diameter (G) than in its front end region (12) adjoining the expansion region (6), with the sleeve section having a narrowing intermediate region (11) extending between the rear end region (10) and the front end region (12) and having a smallest outer diameter (M) which is smaller than an outer diameter (F) in the front end region (12).

Abstract: In an eccentric screw pump having a pump shaft which at one end is in the form of a hollow shaft mounted near a joint head or the like connecting portion and connected thereto, and which is fitted on to the output shaft of a pump drive and is connected thereto, the pump shaft and the output shaft are connected by a force-locking connection. There is also provided a clamping device which produces radial forces and which embraces the drive end of the pump shaft, said end being in the form of a hollow shaft. The clamping device is arranged near the end edge of the cylinder wall at a first support portion.

Abstract: A joint connects one end of a tube to the side of a hollow member. It employs a pair of wedge elements that have sloping sides. A threaded fastener passes freely through a proximal wedge and then is threaded through a distal wedge. The fastener first passes through a hole in the side of the member and the wedges are inserted into the end of the tube. Tightening the fastener draws the wedges toward the member and causes the wedges to cooperate with one another to grip the inner surfaces of the tube to create a strong joint stable in many directions. Joints shown for tubes with various shapes.