Abstract: Internal combustion engine for gaseous fuels having a combustion chamber (2) in which gaseous fuel is burned. The gaseous fuel is kept at an operating pressure in a gas tank (7) and fed to the combustion chamber (2) via a supply line (6). The combustion chamber (2) is connected to a fresh air line (10) through which ambient air is fed to the combustion chamber (2). The exhaust gas from the combustion chamber (2) is fed to an exhaust gas catalytic converter (14) via an exhaust pipe (13). A pressure relief line (16, 16?) with a switchable release valve (17, 17) branches off from the supply line (6), via which gaseous fuel can be discharged from the supply line (6).

Abstract: An electrochemical cell is proposed having an electrical unit, a first frame part and a second frame part, wherein the electrical unit is clamped in the area of the clamping surfaces between the first frame part and the second frame part, characterized in that the electrical energy unit and the first frame part have shape features which match one another and engage in one another such that a relative position of the electrical unit with respect to the first frame part is at least substantially fixed, at least in a state in which the clamping assembly of the frame parts and the electrical unit is released. This allows the electrical unit to be prefixed in the first frame part before production of the clamping assembly, making it possible to prevent the electrical unit from being installed obliquely.

Abstract: An exemplary electrical switch cabinet for use in the low voltage range with voltages up to 500 V and electric currents up to 63 A, is constructed as a wall hung cabinet for surface or recessed mounting or as a standing cabinet, from a rear wall and side wall parts connected thereto. The cabinet can include at least one movable front door, and can be provided with internal fittings for the connection of switching devices arranged in the switch cabinet. The side wall parts and the rear wall are modularly configured and rigidly connected to one another, and the at least one movable front door can be guided in grooves through straps.

Abstract: The invention relates to a medical or dental-medical instrument (2) having a memory element (10p) for identification and/or operational parameter data. IN order to extend the range of possible applications of the instrument, the memory element (10p) is constituted for the overwriting of the data by other data.

Abstract: The invention relates to a medical or dental-medical instrument (2) having a memory element (10p) for identification and/or operational parameter data. IN order to extend the range of possible applications of the instrument, the memory element (10p) is constituted for the overwriting of the data by other data.

Abstract: An arrangement for the carrying of dental implements, consisting of a carrying plate arranged on a supporting member, and which has one side facing upwardly including positioning elements provided for the implements on the upwardly facing plate side thereof. The dental implements which are located on the support plate can consist of hand instruments, for example, probes, mirror, tamping instruments, pincettes or the like. Furthermore, the implements can also be formed of cotton receptacles, medication flasks, waste receptacles, as well as worktool, handpiece and anglepiece supports. The positioning elements for the implements can be arranged directly on the carrying plate or also in flat trays, or can even be formed by the flat trays themselves.

Abstract: A switching arrangement for the control of setting or control elements which are associated with the treatment instruments of a dental treatment location, including a control data memory in which there are stored predetermined control data constants for the treatment instruments. The data is retrievable through a control component for the adjustment of the presently considered control element, and includes a first signal or voltage output arrangement which, through its supplied signals or voltages, facilitates changes in the control data which are conveyed to the control component from the control data memory. A second voltage output arrangement is connected with the control component which supplies a voltage variable from an initial or zero value, and wherein in the active switching thereof, there is prevented the receipt or delivery of signals from the control data memory and of signals or voltages from the first signal or voltage output arrangement through the control component.

Abstract: A circuit arrangement for controlling the action of an adjusting device, in particular of a patient chair, which comprises, as target value indicator, a digital-analog converter (1) and, as actual value indicator controllable by the adjusting device, a potentiometer (2), which receives an equalized feed voltage which serves to operate the digital-analog converter, and which is connected via a branch (13) to a comparator unit (12), whose other input is connected to output (8) of the digital-analog converter (1), and which controls the adjusting device (31, 32, 33). According to this circuit design, the digital-analog converter (1), and the potentiometer (2), form a Wheatstone bridge of which one diagonal is supplied with a single feed voltage, while the other diagonal contains the comparator unit (12).

Abstract: A dental treatment apparatus comprising at least one dental treatment instrument, a control data store in which certain fixed control data values are stored and from which they can be called-up as and when necessary, and a display device. In order to permit modification of the control data emitted in each case from the control data store, without the need to refer to the display device, a control member is coupled with the control data store and converts the control data emitted in each case from the control data store into corresponding analog voltages, which can be modified by the emission of an analog voltage corresponding to a desired modification, and which act as operating signals for the instruments.

Abstract: A dental treatment apparatus having a plurality of dental instruments which are adapted to be deposited and releasably retained in an instrument holding device. The dentist is a position to store for the individual treatment instruments operating data of his own selection which will constitute fixed values. The treatment instrument will begin with these fixed values when taken into operation. However, the dentist can deviate from the fixed values and vary the operating data. The fixed values, as well as the varied operating data can be read off by the dentist on a display arrangement. After termination of the treatment, the treating instrument upon again being placed in operation commences at the stored fixed value. A data converter provides that the operating data are indicated on the display arrangement. It is possible to call up, by means of a single selecting sequence, the sets of data informations typical for treatments by all instruments which are to be employed.

Abstract: A dental treatment installation comprising at least one dental handpiece having an air operated drive motor and an outlet for discharging operating media used for dental purposes, a spray handpiece, a control arrangement for controlling the supply of operating media to the handpieces, and a storage device for the handpieces having storage switching-means which are arranged to place the handpieces on stand-by to receive operating media upon extraction of the handpieces from the storage device. The control arrangement includes supply sleeves having ducts for supplying operating media to both types of handpiece, couplings for releasably coupling the supply sleeves to the handpieces, and a foot-operated device for regulating the supply of operating media to the handpieces and including first switching-means for controlling the supply of air to drive the motor of the dental handpiece and second switching means for controlling the supply of spray to the dental handpiece.

Abstract: A circuit arrangement is provided for controlling the drive of dental treatment instruments by means of driving devices associated therewith and the operating data of which are adapted to be fed to a separate forward/backward counter when the particular treatment instrument is selected for use. A starter switch is connected to the forward/backward counter and is operable, when actuated, to vary the particular stored count of the counter step-wise for the purpose of varying the operating data and for transmission to a control element, for the control thereof, which is associated with the particular treatment instrument. Upon actuation of the starter switch in order to vary the stored count of the forward/backward counter, the counting speed of the counter is increased with increasing actuation time of the starter switch by reason of the fact that the counter receives a number of counter pulses which increase per unit time.

Abstract: An arrangement for a dental treatment facility for detecting the removal of work tools and/or drive elements utilized during the operation of the work tools from receiving locations provided therefor.

Abstract: A dental treatment installation comprises a plurality of dental treatment instruments, a plurality of tools having different operating parameters and replaceably mountable in the instruments, and a main control device arranged to be supplied with the operating parameters of a selected instrument and optionally with further operating parameters, and to compute therefrom the operating point for the drive of the selected instrument and also the working data of the selected tool. The main control device includes stores which store the operating parameters of the tools under corresponding tool addresses or operating data addresses for the automatic control of the combined tool and instrument operation. A tool receiving station has receiving locations in which the tools are replaceably mounted and means is provided for transmitting automatically from said station to said main control device the tool address specific to a particular tool upon extraction of the latter from its receiving location.

Abstract: A dental treatment apparatus having a plurality of dental instruments releasably retained in an instrument-holding device. A control and display arrangement controls the operation of an instrument upon extraction from the holding device, and displays the magnitude of an operating parameter of the instrument on a display device. A control data store is arranged to store pre-determined fixed control data values for the operating parameters of the instruments. To enable the user to alter the predetermined fixed values, a forward-backward counter is connected to the data store which can also store the altered values. A data converter is connected to the counter and to the display device for converting the instantaneous value stored in the data store to a corresponding service datum instantaneous value to be displayed by the display device.

Abstract: A dental unit having pressure-medium operated handpieces, a holder for each handpiece, a control unit operable to control the supply of pressure medium to each handpiece, and switch means associated with each holder and with said control unit, each switch means being operable upon removal of the respective handpiece from its holder to initiate operation of the control unit for the supply of pressure medium to the handpiece.