Abstract: A low volume liquid handling system is described which includes a microdispenser employing a piezoelectric transducer attached to a glass capillary, a positive displacement pump for priming and aspirating liquid into the microdispenser, controlling the pressure of the liquid system, and washing the microdispenser between liquid transfers, and a pressure sensor to measure the liquid system pressure and produce a corresponding electrical signal. The pressure signal is used to verify and quantify the microvolume dispensed and is used to perform automated calibration and diagnostics on the microdispenser.

Abstract: In a microvolume liquid handling system, a system reservoir is connected with tubing to a pressure control system for controlling the liquid system pressure in the system reservoir. The system reservoir is coupled to one or more microdispensers through a distribution tube having a branched section for each microdispenser. In this embodiment, each microdispenser is coupled to its own flow sensor and to enable a system controller to respectively measure and control the flow of liquid in the each microdispenser.

Abstract: A wheel for an inline skate type roller skate includes a wheel rim portion, a tread surface on the wheel rim portion and at least one ball bearing located entirely within the outer contour of the wheel. Disk-type seals mounted on the inner race of the ball bearing cover the axially outer surfaces of the bearing to protect the bearing against the entry of contaminants. The seals are also located entirely within the outer contour of the wheel.

Abstract: A low volume liquid handling system is described which includes a microdispenser employing a piezoelectric transducer attached to a glass capillary, a positive displacement pump for priming and aspirating liquid into the microdispenser, controlling the pressure of the liquid system, and washing the microdispenser between liquid transfers, and a pressure sensor to measure the liquid system pressure and produce a corresponding electrical signal. The pressure signal is used to verify and quantify the microvolume dispensed and is used to perform automated calibration and diagnostics on the microdispenser.

Abstract: A low volume liquid handling system is described which includes a microdispenser employing a piezoelectric transducer attached to a glass capillary, a positive displacement pump for priming and aspirating liquid into the microdispenser, controlling the pressure of the liquid system, and washing the microdispenser between liquid transfers, and a pressure sensor to measure the liquid system pressure and produce a corresponding electrical signal. The pressure signal is used to verify and quantify the microvolume dispensed and is used to perform automated calibration and diagnostics on the microdispenser.

Abstract: A low volume liquid handling system is described which includes a microdispenser employing a piezoelectric transducer attached to a glass capillary, a positive displacement pump for priming and aspirating liquid into the microdispenser, controlling the pressure of the liquid system, and washing the microdispenser between liquid transfers, and a pressure sensor to measure the liquid system pressure and produce a corresponding electrical signal. The pressure signal is used to verify and quantify the microvolume dispensed and is used to perform automated calibration and diagnostics on the microdispenser.

Abstract: A low volume liquid handling system is described which includes a microdispenser employing a piezoelectric transducer attached to a glass capillary, a positive displacement pump for priming and aspirating liquid into the microdispenser, controlling the pressure of the liquid system, and washing the microdispenser between liquid transfers, and a pressure sensor to measure the liquid system pressure and produce a corresponding electrical signal. The pressure signal is used to verify and quantify the microvolume dispensed and is used to perform automated calibration and diagnostics on the microdispenser.

Abstract: An interchangeable ice skate blade for use with a roller skate boot of the inline skate type includes a plurality of elongate bores or slots and a single circular bore or slot of a comparable size in the region of the edge of the blade remote from the ice-engaging edge. The combination of elongate and circular bores or slots allows the blade to be compatible with roller skate boots having different points of attachment of the blade to the boot while securely retaining the blade against unintended lengthwise or transverse movement relative to the boot.

Abstract: A low volume liquid handling system is described which includes a microdispenser employing a piezoelectric transducer attached to a glass capillary, a positive displacement pump for priming and aspirating liquid into the microdispenser, controlling the pressure of the liquid system, and washing the microdispenser between liquid transfers, and a pressure sensor to measure the liquid system pressure and produce a corresponding electrical signal. The pressure signal is used to verify and quantify the microvolume dispensed and is used to perform automated calibration and diagnostics on the microdispenser.

Abstract: An arrangement for optically tracking moving objects and for measuring trajectories of the moving objects using triangulation. The arrangement includes a pair of measuring locations including a first measuring location and a second measuring location disposed at a distance with respect to the first measuring location. The arrangement further includes a plurality of pairs of theodolites for simultaneously tracking and measuring the trajectories of the moving objects, each pair of theodolites being effective for tracking and measuring a trajectory of a corresponding moving object and further having a first theodolite and a second theodolite. First theodolites of each pair of theodolites together form a first set of theodolites disposed on a common azimuthal axis at the first measuring location; and second theodolites of each pair of theodolites together form a second set of theodolites disposed on a common azimuthal axis at the second measuring location.

Abstract: Roller bearing for supporting members with limited axial movement, consisting of bearing elements having confronting raceways and a plurality of rolling elements held in a cage between the raceways. One of the raceways is bounded by flanges defining contact surfaces. At least one end surface of the cage (3) has elastic segments (9), radially oriented sections (10) of which engage in a groove (11) in one of the bearing elements. In the terminal axial positions of the one bearing element (2) relative to the other bearing element (1), the radially oriented sections (10) of the cage (3) rest against the lateral surfaces (13) of the groove (11).

Abstract: In a method and an apparatus for material processing with the aid of a laser the laser light is directed via a laser optical system onto the material and the light reemitted or scattered back by the material is conducted via the laser optical system onto a detector arrangement which is followed by an evaluating circuit for controlling the laser. The amplitude-versus-time profile of the light incident on the detector arrangement is evaluated and used to control the laser and/or an optical switch arranged in the output beam path of the laser.

Abstract: A control device for electrical wheelchairs or the like having a manual control lever which is so supported that it can be moved in any direction desired, and is biased into a central neutral position by means of a spring. Two electro-mechanical adjustment elements, e.g., resistors or potentiometers, are provided, the electrical starting values of which are dependent on their mechanical settings. Two mechanical transmission devices each transfer only one of two movements of the control lever in directions essentially perpendicular to one another to the mechanical-electrical adjustment elements. The mechanical transmission devices comprise two plastic plates slidably-disposed one over the other, each containing an inclined elongated slot disposed at right angles to each other. The plates carry projecting studs which actuate said electro-mechanical adjustment elements when the plates move.

Abstract: A pattern is applied to a travelling web, such as a rug, by delivering a carrier liquid with individually spaced apart quantities of a pattern liquid therein to the surface of the rug. The pattern liquid is delivered into or onto the carrier liquid via various types of applicator means and the individual quantities of pattern liquid are maintained in spaced apart relation at least until being deposited onto the nap of the rug.

Abstract: A support roll assembly adapted to be rotatably journalled between spaced frame members comprising an elongated hollow support roll, and support pins mounted in opposite axial ends of said roll, at least one of said support pins being supported in a ball bearing consisting of an outer ring having a generally cylindrical outer race and terminating in a radially inwardly facing thrust shoulder, an inner member having a groove-shaped inner race and formed integrally with the support pin and a plurality of balls arranged in the annular space between the inner and outer races and elastic means in the form of a sealing plug adapted to be mounted in the thrust shoulder of the outer ring and including an axially inwardly yielding elastic wall confronting the inner axial end face of the inner member and fastening means in the form of a fastening screw member engaging in the threaded bore section of the inner member to secure the inner member and support pin to the frame and being of a predetermined configuration so th

Abstract: A leg support for a wheelchair, comprising a vertical supporting tube, which is detachably mountable on said wheelchair, the upper end of said supporting tube having a horizontal arm mounted thereon, which arm extends in the direction of travel and on which arm a leg support carrier, supporting a foot-plate and a calf-plate, is pivotably mounted by means of its upper end, in which the leg support carrier is formed by an external telescopic tube and an internal telescopic tube inserted into the external telescopic tube, both tubes being pivotably mounted on the arm about their own respective swivel axles.

Abstract: A pattern is applied to a travelling web, such as a rug, by delivering a carrier liquid with individually spaced apart quantities of a pattern liquid therein to the surface of the rug. The pattern liquid is delivered into or onto the carrier liquid via various types of applicator means and the individual quantities of pattern liquid are maintained in spaced apart relation at least until being deposited onto the nap of the rug.

Abstract: An electrically driven wheelchair having steerable rear wheels controllable by means of a joystick control operating an electromechanical steering mechanism including a control circuit.The electrical control circuit includes a voltage divider which receives a voltage determined according to the travelling speed of the wheelchair to enable the turning circle of the steering mechanism to be adjusted in relation to the travelling speed, so that at high speeds a large turning circle only is available while at low speeds a small turning circle is allowed, thereby minimizing the possibility of tipping the wheelchair over by turning too sharply at high speed.

Abstract: Two bearing sections pertaining to feelers on arms are maintained in engagement with journal axles of two rolls and a pair of transducer elements on the arms monitors therein distance from each other in representation of the roll gap. The arms can be pivoted out of the way in that the bearing sections are removed from between the axles.

Abstract: Pole rod electrodes especially for quadrupole mass spectrometers are seated in a pipe of thermally moldable material formed with a number of intersecting adjacent inside flat surfaces in precise relationship with the pole rods parallel to one another within a tolerance of a few micrometers arranged to insure a resolution within the range around the mass number 1000 so that it is possible to separate completely adjacent integral mass numbers, the rods being capable of removal.