Abstract: A resolver includes a first assembly having transmitter windings and a first winding of a first transformer. The resolver also includes a second assembly having receiver windings, a first winding of a second transformer, and a first winding of a third transformer. A third assembly of the resolver includes a second winding of the first transformer, a second winding of the second transformer, and a second winding of the third transformer. The three assemblies are rotatable relative to each other about an axis. The windings of the first transformer, the windings of the second transformer, the windings of the third transformer, the transmitter windings, and the receiver windings are arranged opposite each other in each case, separated by a radial gap.

Abstract: A resolver includes a first assembly having transmitter windings and a first winding of a first transformer. The resolver also includes a second assembly having receiver windings, a first winding of a second transformer, and a first winding of a third transformer. A third assembly of the resolver includes a second winding of the first transformer, a second winding of the second transformer, and a second winding of the third transformer. The three assemblies are rotatable relative to each other about an axis. The windings of the first transformer, the windings of the second transformer, the windings of the third transformer, the transmitter windings, and the receiver windings are arranged opposite each other in each case, separated by a radial gap.

Abstract: In a resolver for determining the relative angular position between two subassemblies, each subassembly includes a winding, the winding being situated inside a housing made up of two housing shells. The housing shells have tabs which are oriented with an axial directional component and joined in interlocking manner with axial overlap at a mutual offset in the circumferential direction.

Abstract: In a resolver for determining the relative angular position between two subassemblies, each subassembly includes a winding, the winding being situated inside a housing made up of two housing shells. The housing shells have tabs which are oriented with an axial directional component and joined in interlocking manner with axial overlap at a mutual offset in the circumferential direction.

Abstract: In the case of a handpiece (3) for medical purposes, preferably for a cutting treatment of a dental root canal, with a tool holder (5) arranged in the front end region of the handpiece (3), with a retaining coupling (16) for detachable fastening of the tool (6) in the tool holder (5) and with a drive connection (8) extending lengthwise through the handpiece (3) for a rotary and/or reciprocating drive of the tool holder (5), an overload coupling (14) that limits the transmittable torque to a maximum torque value is arranged in the drive connection (8).

Abstract: A brushless resolver having a stator and a rotor, and a resolver part axially displaced to one another and a transformer part and having associated windings is provided. An additional short-circuited winding arranged parallel with the transformer rotor winding with few turns on the iron core thereof is also provided. A lowpass filter is thereby formed, which compensates the unwanted frequency-dependent phase displacement between the input voltage and the output voltages for the respective frequency.

Abstract: In a tooth cleaning instrument (1) with an elongate handpiece, which carries a tooth cleaning tool (3) on its forward end, which can be set into vibration by a motor driven vibration generator (7) which is associated with the tooth cleaning instrument (1), whereby the tooth cleaning instrument (1) is connected or is detachably connectable at its rear end to a supply hose (6) having energy and/or media supply lines, the tooth contact element (17) is areal or quasi-areal and has a surface structure which is suitable for the abrasion of the tooth coating.

Abstract: In a handpiece (2) having a housing (3), a drive sleeve (7) mounted therein, into which drive sleeve a tool (9) can be inserted with its shaft (11) and which drive sleeve is mounted in the housing to be rotatable around its middle axis (9a) by a drive, a releasable coupling for rotational locking connection of the shaft (11) in the drive sleeve (7), and a releasable coupling for axial connection of the shaft (11) with the drive sleeve (7), whereby each coupling is formed by a coupling recess (18) in the shaft (7) and a coupling pin (19) on the drive sleeve (7) engaging in the coupling recess, the two couplings are formed by at least one common coupling recess (18) and the common coupling pin (19) is mounted to be moveable between a coupling position engaging in the coupling recess (18) and a decoupling position releasing the coupling recess (18) and is biased into its coupling position and against the shaft (11) by the force of a spring (34).

Abstract: A dental laser treatment unit, especially for medical or dental purposes having a control unit and a supply device, connected with the control unit by a releasable connection, for a laser treatment instrument.

Abstract: A rod-shaped light conductor for medical purposes, for example, which is employed in the dental medicine. The light conductor is protected against thermal stresses through the intermediary of a special surface coating, as a result of which there is prevented any deterioration in the discharge of light from the end surfaces of the light conductor.

Abstract: A tartar-removing dental handpiece, consisting of an elongated gripping sleeve on which there is arranged a vibration generator, which is connected to a vibratable tartar-removing instrument arranged at one end of the gripping sleeve for transmitting vibrations thereto. The gripping sleeve incorporates at least one medium supply conduit which is connected through a coupling member located at the end of the gripping sleeve distant from the instrument to a connecting conduit leading to a medium source.

Abstract: There is disclosed a dental handpiece comprising a grip sleeve, a head portion provided at one end of the handpiece, a drive unit provided in the head portion for driving a dental implement, and a connecting portion arranged at an opposite end of the handpiece for rotation relative to the grip sleeve and releasably connected at one end to the grip sleeve. The connecting portion serves to convey operating media for the handpiece, and is adapted for connection at its other end to a supply tube for supplying the operating media. In order to provide built-in illumination in the region of the dental implement, an elongate photoconductive device is provided which extends generally longitudinally within the handpiece and includes, within the rotatable connecting portion, a light transmitting portion in the form of either a section of a strand like photoconductor, or an electrically operated bulb.

Abstract: A dental handpiece with a gripping sleeve-like base member which is detachably connected with a headpiece mounting a work tool, a connecting sleeve of the headpiece being insertable into the power-take off end of the base member, wherein a roll body is radially movably supported in each of one or more cutouts in the base member wall, inwardly extending therethrough with a portion of its volume, which is movable through the intermediary of a coupling element movably arranged on the base member, and which includes an inclined plane for the engagement with the roll body under the assumption of a clamping fit in contact against the connecting sleeve.

Abstract: A dental handpiece having a holding sleeve, an air-driven unit mounted at one end of the sleeve to drive a dental tool, and a connecting member releasably and relatively rotatably connected to the other end of the sleeve. A supply hose for conveying fluid pressure media is coupled releasably and non-rotatably to the end of the connecting member remote from the sleeve, and communicating fluid pressure lines in the connecting member and in the sleeve convey fluid pressure media between the hose and consumers of fluid pressure media at the free end of the sleeve, such as the tool-drive unit. The releasable connection between the connecting member and the sleeve is provided by a pin on the connecting member which is received by a passage in the sleeve. The fluid pressure lines in the connecting member extend also generally lengthwise along the pin, but terminate in radial portions having outlet apertures which are axially spaced along the outer periphery of the pin.

Abstract: A dental handpiece having a sleeve, an axial drive shaft in the sleeve for driving a dental instrument at one end of the handpiece, a first coolant supply line in the handpiece, a second coolant supply line extending axially towards the dental instrument, and a coolant duct in the wall of the sleeve which intercommunicates the first and second coolant lines. The coolant duct extends rectilinearly and generally radially between an inner end which faces the interior of the sleeve and which communicates with the first coolant line, and an outer end which communicates with and is releasably connected to the second line at a location in the wall of the sleeve and which permits manipulation externally of the handpiece for releasing and connecting the duct and the second line.

Abstract: A miniature motor for driving a hand-held instrument such as a dental handpiece, the motor having at one end a connecting member for supplying coolant to a motor coolant line and motive energy to the motor, and at the other end a coupling member to which a hand-held instrument can be releasably connected. An intermediate coolant line in the coupling member serves to transfer coolant from the motor coolant line to a coolant supply line in the instrument which directs the coolant to a working implement at one end of the instrument. The coolant line in the motor comprises a tubular member which is removably mounted in the motor and has a releasable connection at its inlet end to a coolant supply connector in the connecting member, and a releasable connection at its outlet end to the intermediate coolant line in the coupling member. At least one of these releasable connections is provided in a closure member which is removable in order to render the tubular member accessible for servicing.

Abstract: An electrolytic method for making tin (II) sulfate wherein tin is anodically dissolved in a sulfuric acid solution and wherein the anode space is separated from the cathode space by a diaphragm, the diaphragm being composed of an inorganic, ceramic material which has been densified by sintering at above 1,000.degree. C.As a result of this process, tin (II) sulfate solutions can be obtained which have a very low content of tin (IV) compounds and from which a highly pure bivalent tin sulfate can be recovered.

Abstract: A device for clamping and unclamping dental tools as, for example, drills, in a dental handpiece with an angled head in which the tool is held by means of a two-part clamping unit. One part of this clamping unit has a collet for holding the tool, and the other part of the clamping unit has a driven rotary hollow shaft located in the head. The collet is movable lengthwise inside the hollow shaft. To assume its clamped or unclamped position, the collet and hollow shaft are threadable into one another. One of the two parts of the clamping unit has at least one key surface accessible from the exterior at the tool end of the head. The other part of the clamping unit has also at least one key surface accessible from the exterior. A U-shaped carrier is provided with a first flange having a stationary key with parts for engagement with the key surfaces located at the tool end of the head.

Abstract: Connector for rotary dental tools and the like, comprising a housing, a support sleeve rotatably journaled in the housing to receive a shaft of a dental tool, wherein the sleeve is in the form of a circumferentially closed tubular member that surrounds the shaft without any play, and clamping means between the sleeve and the shaft, for immobilizing the tool prior to imparting rotary movement thereto, the clamping means being elastically deformable in the radial direction, and short in comparison to the length of the sleeve. Two exemplary embodiments are disclosed, one including a mechanism that includes a follower and a clamping nut for the tool, while the other has an inner turbine wheel and a conical support ring with a collar and a biasing spring acting on the clamping means.

Abstract: A dental handtool in which an extended sleeve has at its center, a driving shaft for rotary movement of the tool used for dental treatment. The driving shaft is at one end of the sleeve, and a freely rotating driving part is attached to the handtool at the opposite end of the sleeve. A coolant pipe between the driving part and the handtool, feeds coolant to the treatment area of the dental tool.