Abstract: The apparatus of the invention includes a mounting frame which is pivotally mounted on the load drum carriage and is pivotally positioned by a pneumatic positioner. A cleaning brush assembly is rotatably mounted on the mounting frame so that, as the actuater moves the mounting frame toward the load drum surface, the cleaning brush assembly engages the periphery of the load drum to clean same. A drive motor is provided for rotating the cleaning brush assembly as it is pressed against the surface of the drum. The pneumatic actuator is connected to a regulated fluid pressure source so that the force with which the cleaning brush assembly is pressed against the drum surface can be regulated and is maintained below the unloaded threshhold force at which the load drum controller is set to prevent automatically rezeroing the load set point of the load drum.

Abstract: A pressure sensor (38) is proposed with strain gauges (18, 20, 22, 24) such as thick-film resistance strain gauges arranged on a diaphragm, these gauges being preferably connected to form a Wheatstone bridge, where branches of the bridge circuit have compensating resistors (26, 28, 30, 32). The compensating resistors are arranged outside the active area (17) of the diaphragm.

Abstract: An apparatus for automatically adjusting the rim width between upper and lower rims on a tire uniformity machine of the type includes an upper spindle rotatable about the axis thereof, a lower spindle located opposingly in vertical alignment with the upper spindle, the lower spindle being rotatable about the axis thereof and movable in the axial direction, and upper and lower rims detachably mounted coaxially on opposing end portions of the upper and lower spindles, respectively, to release grip therebetween a testing tire to be rotated and held in contact with a load wheel for inspection of uniformity. The rim width adjusting apparatus includes a ring-like adapter threaded on a lower end portion of the upper spindle and vertically movably supporting the upper rim on the upper spindle; and a rotation blocking device mounted on a bearing housing over the adapter for blocking rotation of the adapter relative to the upper spindle.

Abstract: A rim mounting mechanism for a tire uniformity machine has on the side of upper and lower spindles thereof an upper rim and a lower rim to be fitted in bead portions of a tire, respectively, and arranged to lift up the tire by a tire transfer means, grip the tire from the upper and lower sides thereof by means of the upper and lower rims and rotate the tire T about its axis by rotation of the upper spindle about the axis thereof. The rim mounting mechanism includes a rim assembly transfer device delivering a rim assembly R, formed by assembling together an upper rim, a lower rim and a lower spindle at a place outside the machine, to a position above the tire transfer device and in vertical alignment with the axis of the upper spindle and to dismantle a tested tire from the machine at a position immediately beneath the upper spindle.

Abstract: In a micromachined silicon pressure sensor comprising a resonantly vibratable beam supported on a diaphragm, the beam is indirectly excited into resonant vibration by directing an optical excitation signal at the beam resonant frequency onto a part of the sensor other than the beam, preferably the diaphragm. Preferably, the optical excitation signal is of a wavelength to which the sensor is fairly transparent, and is directed through the beam and diaphragm to be absorbed by a suitable coating on the underside of the diaphragm. The optical excitation signal produces local heating, and the resulting expansions and contractions at the beam resonant frequency propagate through the sensor structure to excite the beam into resonant vibration. Another optical signal is used to detect the frequency of vibration of the beam, and a positive feedback loop maintains the frequency of the excitation signal equal to the detected beam vibration frequency.

Abstract: A device and the use of, are disclosed for pressure testing the integrity of coolant systems of the internal combustion engine, and more particularly to a compressed air operated pressure tester for performing diagnostic services on water cooled engines and their related components which include the radiator, the coolant flow passages within the engine itself, the pressure type radiator filler cap with available adapters, and the connecting hoses. The device includes a connecting means and restriction component for discharging compressed air into the coolant system with an adjustable pressure relief valve for limiting the maximum pressure.

Abstract: The combination tire valve and pressure gauge of the present invention is formed to be substantially the same size as current tire valve stems, such that it may be used as a replacement part therefore. The device includes a pressure sensitive bellows disposed within the stem, the movement of which is counteracted by a calibrated spring. Movements of the bellows, caused by changes in the tire pressure, are mechanically translated to a rotary motion of a pressure indicator. A window is formed in the tire stem to permit viewing of the pressure indicator, whereby different numerals corresponding to different tire pressures become visible in the window upon rotation of the indicator which is caused by movement of the bellows. An air channel is formed through the device to permit air to be pumped into the tire. A rotary indicator having an internal spiral groove rotates upon a driving rod formed with projecting driving pin members that project into the spiral groove to cause the rotation of the indicator.

Abstract: A tire uniformity measuring instrument which does not suffer from a temperature drift and assures accurate measurement of uniformity of a tire. The instrument includes a spindle to which a tire is removably mounted for coaxial integral rotation, a holder, a bearing for supporting the spindle for rotation around the spindle axis, and a driven drum supported for rotation around a fixed axis parallel to the axis of the spindle. The holder is movable in a direction perpendicular to the axis of the spindle until a tire connected to the spindle is contacted with the drum to allow the tire to be rotated by the drum when the drum is driven to rotate. A detector is held on the holder for measuring uniformity of a tire fixed to the spindle when the tire is rotated by the drum. The holder has a cooling water passage formed therein in the proximity of the bearing, and cooling water is circulated in the cooling water passage in the holder and cools the holder and the bearing.

Abstract: An omnidirectional speed sensing system includes a rotatable member; a channel supported by the rotatable member and having an inlet and an outlet; a single pressure sensing port in the system disposed the channel between the inlet and the outlet for sensing the dynamic pressure of the fluid flow through the channel which pressure is a function of the rotational speed of the rotatable member and the velocity of the rotatable member through the fluid; transducer means responsive to the pressure at the sensing port for producing a pressure signal; means responsive to the pressure signal for extracting the first harmonic of the pressure signal; and means responsive to the magnitude and phase of the first harmonic of the pressure signal for indicating the velocity and direction of the sensed speed.

Abstract: The subject apparatus enables detecting changes in pressure of the fluid in a conduit from outside the conduit without disturbing the conduit or its function. The detection is made by sensing changes in diameter of the conduit caused by pressure changes, using a linear measurement electrical transducer. The transducer is mounted in a cylindrical sleeve which telescopes in a second sleeve which is externally threaded at both ends. A fixture is threaded onto one end with the sensing probe of the transducer extending through a hole in the fixture. An auxilliary sleeve is installed between the transducer support sleeve and the fixture, and also extends through the fixture and is forced toward the fixture by a compression spring between the transducer sleeve and auxilliary sleeve. A knurled knob is threaded onto the second sleeve and is used to adjust the position of the transducer along the axis of the sleeve.

Abstract: A micromachined silicon pressure transducer employs a vibrating bridge that is formed from the same silicon slab as the pressure responsive diaphragm. The resonant frequency of the bridge is a temperature insensitive representation of the pressure.

Abstract: A semiconductor chip with a gauge pressure sensor section and an absolute pressure sensor section is anodically bonded, in a vacuum, to a glass mount with an evacuated space between the absolute-pressure sensor section and the mated surface portion of the glass mount. The pressure to be measured is received by the reverse surface of the gauge pressure sensor section. Since no complicated package is mounted within the outer package, the assembly of the sensor is easy. Further, since the pressure sensor has two sensor sections, namely, the gauge pressure sensor section and the absolute pressure sensor section, the sensor can be used as an absolute pressure sensor of the reverse-surface pressure-receiving type.

Abstract: A pressure detection apparatus is provided with a semiconductor pressure sensor interposed between a reference pressure side and a measured pressure side and adapted to detect pressure in fluid corresponding to the difference between the reference pressure and the measured pressure. In addition, the apparatus is connected to an output side of the semiconductor pressure sensor and also includes a sensor offset compensation circuit for adjusting an output value from the semiconductor pressure sensor at a predetermined temperature to provide zero-point temperature compensation, thereby making it possible to compensate for an offset value of the semiconductor pressure sensor. This apparatus is not affected by the external atmospheric temperature, thus enabling it to provide fully stable operation.

Abstract: A sensor for measuring the relative velocity of an oncoming medium includes a tubular and preferably radially symmetrical sensor body having a leading front end, and a wall with an inner surface defining an axial hollow space being open to the outside at the leading front end. The sensor body includes a preferably streamlined sensor head portion associated with the front end, and a remainder of the sensor body forming a sensor shaft. The wall has at least one conduit being radial or having a radial component. The at least one conduit is separated from the axial hollow space and spaced apart from the front end. The at least one conduit is open to the outside from one of the portions. A method of measuring the relative velocity of the medium includes detecting a first measured value representing the sum of the static pressure and the velocity-dependent dynamic pressure of the medium with an axial pitostatic tube discharging at the front end of a sensor body.

Abstract: A wind tunnel having a test section and a fan section, interconnected by two passageways to form a recirculating air flow through said sections. There is a diffuser immediately downstream of the test section, and a second diffuser immediately downstream of the fan section. Each diffuser has an intermediate flow section where the side wall extends radially outwardly in a downstream direction at a relatively sharp angle. At the upstream end of the intermediate section there is a peripheral suction slot to draw in boundary layer air, and a by-pass passageway to discharge the air tangentially in a downstream location of the diffuser. This enables a substantial reduction in air velocity in a relatively short axial length.

Abstract: The differential pressure measuring apparatus comprises a single chamber differential pressure sensor filled with a fluid and having two measuring capacitors whose capacitances vary in opposite senses in response to the differential pressure to be measured and in the same sense in response to the temperature said capacitances being transformed by means of associated capacitance measuring circuits into measurement signals which are supplied to a calculation circuit for calculating the temperature and the differential pressure. A temperature measuring means which comprises a temperature sensor mounted on the differential pressure sensor and a temperature measuring circuit connected to the temperature sensor measures directly the temperature of the single chamber differential pressure sensor.

Abstract: In a pressure transducer (11), the diaphragm (14) is fastened at the front side of the housing (10) facing the combustion chamber of an internal combustion engine by weld connections. The pressure acting on the diaphragm (14) is transmitted via the plunger (16) to a sensor block (18) including a plurality of piezoelectrically acting crystals (19, 20). The quartz disks (19, 20) are glued together with one another and with an intermediate electrode (21) as well as with the housing (10) of the pressure transducer (11) by a conducting glue. The plunger (14), the abutment (23) and the piezoelectrically acting crystals (19, 20) are connected in the housing (10) so that force transmission to the crystals (19, 20) occurs without mechanical pretensioning. The pressure transducer (11) is virtually free of dynamic temperature errors and enables a relatively exact determination of the pressure curve with respect to time in the combustion chamber of an internal combustion engine in long-term operation.

Abstract: A vibratory force transducer comprising a vibratory beam (21) of rectangular transverse cross section having a uniform thickness t, a major span section of length L.sub.1 and width w.sub.1, and at least one end of the major span having an adjoining tab of greater width W.sub.2 and length L.sub.s. The beam is driven by electrical excitation to vibrate at resonant frequency in a given direction. The tab provides the beam with an effective length which is a function of length of the beam sections and their moments of inertia in the given direction and a criterion by which t, w.sub.1, L.sub.1 and L.sub.s are selected such that resonant frequency and higher harmonic modes of the beam in the given direction are different from the resonant frequency and higher harmonics in any other direction. The transducer may comprise dual beams (31,32) as a double-ended tuning fork with moment decoupling number (45) at the joined end. For each beam comprising a major span of length L.sub.

Abstract: A method and apparatus for non-destructive ultrasonic testing of tires is disclosed wherein an ultrasonic transmitter is positioned outside of the tire and applies pulses of ultrasound to the tire at a plurality of locations around the tire's circumference for transmission through the tire wall and receipt by an ultrasonic receiver located within the tire. The ultrasonic receiver generates signals in response to the received ultrasonic transmissions and a computer processes these signals to generate characterizing data from which defects in the tire may be determined. Signals representative of the defects are then processed to generate a graphic display illustrating the location of the defects with the tire.

Abstract: In a pressure transmitter, a central region of an isolator diaphragm with a substantially flat shape at an undeflected position near room temperature has a depressed shape at a deflected position at a colder temperature. The isolator diaphragm is over a shaped concavity in a transmitter body with a concave shape which corresponds to the depressed diaphragm shape to reduce output error.