Abstract: A pressure gauge has a pressure-sensing unit including an inner casing that contains a pressure-responsive contact unit, a conductive high-pressure contact unit and a conductive low-pressure contact unit. The pressure-responsive contact unit includes an air impervious and length variable tubular member, and a conductive contact member on one end of the tubular member. In the event of an over-inflated condition, the pressure-responsive contact unit moves in the inner casing to establish physical contact with the high-pressure contact unit, thereby controlling a signal-transmitting unit to transmit a first pressure signal. In the event of an under-inflated condition, the pressure-responsive contact unit moves in the inner casing to establish physical contact with the low-pressure contact unit, thereby controlling the signal-transmitting unit to transmit a second pressure signal.

Abstract: A valve cap for an installation having interior air pressure. The cap includes an upper sleeve portion with a central recess for receiving a pair of pressure indicating inserts. The inserts are received in the recess, and each displays one digit of a desired inflation pressure on its upper surface. The inserts also have a formation thereon which enable them to be snapped snugly in place within the recess. Other embodiments include a tray nesting with the inserts. A single insert is also taught.

Abstract: A tire pressure detector connected to the air valve of a vehicle tire to detect its inside pressure, the detector including a tubular shell fastened to the air valve of the vehicle tire, a transparent top cover fastened to the shell to hold down a socket inside the shell, a valve block moved in the socket subject to the condition of the tire pressure of the vehicle tire, and a display bolt supported on a spring member in the valve block, wherein the air pressure of the vehicle tire passes through the air valve of the vehicle tire and the air holes at the socket to push the valve block upwards in the top cover relative to the display unit upon connection of the shell to the air valve of the vehicle tire, and the air pressure of the vehicle tire is read out by viewing the area of the lower portion and upper portion of the display bolt being blocked by the valve block.

Abstract: An improved new wheel (10) is disclosed which has an integral air pressure gauge (24, 100, 200). A passage (34) extends from the rim surface (22) exposed to the tire interior directly to the tire gauge (24, 100, 200) mounted within a recess (26) within the wheel hub portion (12). An adjustable numericaless colored scale (32) is adjusted to indicate proper inflation at the position of the indicator needle (30) when the tire is first inflated to the proper pressure to calibrate the scale. The tire gauge (200) can be precalibrated at the factory by positioning the dial scale (202) in a predetermined orientation to the case so that, at the desired predetermined pressure, the indicator needle (30) is aligned in the area (116) of proper inflation along the center line (104).

Abstract: A tire pressure alarm system includes a tire pressure sensor and radio transmitter circuit, that detects the air pressure of a tire and sends the detected tire pressure value to a radio receiver and alarm circuit by radio transmission communication. A radio receiver and alarm circuit receives the radio signal from a tire pressure sensor and radio transmitter circuit having a tire pressure sensor and radio transmitter circuit that has a power supply circuit. The power supply circuit includes a power source and a power switch, and the power switch has first and second metal contacts respectively connected to the positive and negative terminals of the power source. A metal spring member has a fixed end connected to a first metal contact and a free end mounted with a metal weight and is spaced from a second metal contact.

Abstract: The invention herein relates to a kind of tire pressure alarm device that mainly consists of a cap installed on a connector body, with a trigger device and a power supply fixture installed within the internal space surrounded by the said connector body and the said cap; a pressure switch that includes an active recessed seat having a circular contact edge and which is capable of upward and downward movement within the confines of a guide ring mount, with the lower section positioned against the top of a diaphragm; a hollow threaded base that is fastened onto a mounting base at the upper extent of the active recessed seat and in which the coil spring contained inside the active recessed seat is secured with an adjustment screw; and a conductive ring, the circular edge of which contacts the outer circumference of the active recessed seat such that electric power is conducted between the conductive ring and the trigger device.

Abstract: A tire pressure indicator carried on a tire being monitored for inflation pressure. The indicator includes a housing enclosing an indicating member bearing color coding corresponding to proper inflation. Preferably, additional color coding is provided corresponding to excessive tire pressure and to low or inadequate tire pressure. The indicating member occupies a chamber having a coil spring acting on the indicating member from one direction, and air pressure from the tire acting on the indicating member from the other direction. Differential in forces acting on the indicating member move the indicating member such that the appropriate color coding is revealed through a window formed in the housing. Optionally, the pressure indicator includes a conduit enabling inflation of the tire without requiring removal of the indicator. In alternative embodiments, the novel indicator threads to a conventional filling valve, and replaces the conventional filling valve.

Abstract: A method for operating devices on wheels having pneumatic tires to signal the tire pressure, i.e. the air pressure in the pneumatic tire, in which a pressure sensor measures the tire pressure at regular intervals, and an analysis circuit compares the tire pressure readings with a reference pressure and, in the event of deviations of the tire pressure reading from the reference pressure which exceed a threshold value .DELTA.p, transmits by radio, to an indicating device arranged separately from the wheel, a signal reporting the deviation, such that the device meets its energy needs from an electrical battery. Radio operation is discontinued as long as the pressure measured by the pressure sensor is below a preselected second pressure threshold, in particular a preselected absolute pressure value.

Abstract: A tire pressure drop detecting method, capable of accurately detecting whether the pneumatic pressure of a tire has dropped even if a large driving torque is exerted on the tires. The rotational angular velocities of tires provided for a vehicle are detected and a front/rear acceleration of the vehicle is detected, and then it is discriminated whether the vehicle is in a predetermined decelerated state or not, based on the detected front/rear acceleration of the vehicle. If the vehicle is in the predetermined decelerated state, it is judged whether the pneumatic pressure of the tires has dropped, based on the detected rotational angular velocities. The pneumatic pressure drop of the tire is judged only when the vehicle is in the decelerated state where a difference between the rotational angular velocity of the tire at the time of pneumatic pressure drop and that at the time of a normal inner pressure is relatively large.

Abstract: A tire pressure cover utilizing colors to indicate tire pressure includes mainly a transparent cover and a metal housing. The metal housing houses an alarm bolt, a spring, a floating seat, a rubber pad, an air ventilating plate, and a gasket. When the tire pressure cover is locked to the air nozzle of a tire, the air inside the tire will enter the tire pressure cover and pass through the air ventilating plate to push the rubber pad, which in turn forces the floating seat thereon to rise so that the spring disposed in the floating seat is compressed. The floating seat will become stationary when the internal and external pressure of the tire pressure cover and the tire are balanced. The alarm bolt has a red section and a yellow section. When the floating seat elevates, it may conceal the alarm bolt completely or in part. The user may, by looking at the color exposed on the alarm bolt to determine whether the tire pressure is sufficient.

Abstract: Under-inflation of a tire caused by natural deflation is subject to speci monitoring when all of the tires are in an established temperature range.

Abstract: The main tool housing of a multi-purpose tool is provided with an adapter that is adapted for coupling with a tire air valve, a finger piece disposed in the adapter and adapted to open the tire air valve, and an air inlet formed in the finger piece to permit entry of air into the main tool housing. A tire tread depth measuring unit includes a measuring rod that extends movably into the main tool housing, and a position sensor for generating an electrical displacement signal corresponding to length of the measuring rod that is extended out of the main tool housing when the measuring rod is used to measure depth of a tire tread. A tire pressure measuring unit includes a pressure sensor disposed in the main tool housing adjacent to the finger piece. The pressure sensor generates an electrical pressure signal corresponding to pressure of the air that enters into the main tool housing via the air inlet.

Abstract: A method of detecting a deflated tire on a vehicle by comparing the rolling radii of the tires by means of comparing angular velocity speed signal values C1, C2, C3 and C4 from wheel speed sensors on wheels 1-4 at the left-hand front, the right-hand front, the left-hand rear and the right-hand rear wheel position respectively, comprising the step of calculating an error value DEL' in normal driving by processing the four angular velocity speed signal values C1-C4 in a central processing unit (10) which subtracts the sum of the signal values from one pair of diagonally opposite wheels from the sum of the signal values from the other pair of diagonally opposite wheels and expressing the results as a percentage of the mean of the sumsDEL'=(C1+C4-C2-C3).times.50/((C1+C2+C3+C4)/4),sensing when the magnitude of the error value DEL' is between a DEL' min value of 0.05 and a DEL' max value of 0.

Abstract: A tire pressure indicator includes a cylindrical connecter, a lamp cover combined with the connecter, and an electric conducting unit arranged in the lamp cover. The connecter has an air guide disc to press open an air valve of a tire to let air in the tire flow out into the connecter, If the air pressure in the tire is sufficient, a bellows in the connecter expands inward to push an inverted T-shaped disc inward, which then pushes inward a battery laterally put in an insulating ring so that the negative of the battery disconnected from a negative washer fitted on the inverted T-shaped disc, turning off an LED lamp fixed in the lamp cover. If the air pressure in the tire is insufficient, the bellows shrinks back, permitting the battery move back by elasticity of a spring and contact with the negative washer as to turn on the lamp.

Abstract: A tire air pressure measuring device comprised of a first housing adapted for coupling with a valve stem of a tire. A valve pressure indicator is secured within a second housing. The second cylindrical housing couples with the first cylindrical housing. The valve pressure indicator has a needle extending outwardly therefrom. The needle extends through the first cylindrical housing to engage a contact point of the valve stem of the tire. A battery is secured within a third housing. The third cylindrical housing couples with the second cylindrical housing. The battery has wiring extending outwardly therefrom to electrically couple with the valve pressure indicator. A transmitter is secured within a cylindrical housing. The fourth cylindrical housing couples with the third cylindrical housing. The transmitter has a pair of wires one of which extends outwardly therefrom to electrically couple with the battery and another wire coupling with the valve pressure indicator.

Abstract: A tire air warning apparatus attached to a wheel of the vehicle is disclosed. The apparatus includes a sensor which detects tire air pressure lower than a predetermined value and a transmitter which outputs a signal in accordance with an instruction from the sensor. The transmitter accommodates a transmitting substrate, an electric power source and an antenna electrically connected with the substrate. The transmitter is filled up with a non-conductive resin to fix the substrate, power source and antenna in the transmitter.

Abstract: The invention is directed to a method for allocating the wheel positions to air pressure control devices (6a to 6d) in an air pressure control system and is directed to an air pressure control system for carrying out the method. First measuring devices are provided which are permanently allocated to air pressure control devices 6a to 6d, and a second set of measuring devices 4a to 4d is provided which are permanently assigned to the wheel positions of the motor vehicle. The first measuring devices and the second measuring devices measure a same measurement value. The measurement values measured by the first measuring devices 16a to 16d and the measurement values measured by the second measuring devices 4a to 4d are transmitted to a central unit 10. In addition, the air pressure control devices each transmit an individual identifier to the central unit 10.

Abstract: A pressure gauge of a tire pressure indicator for a set of pneumatic tires of a vehicle includes a casing formed with an aperture and adapted to be secured to a metal wheel of a respective one of the pneumatic tires such that the casing is concealed by the respective one of the pneumatic tires, and a signal generating device disposed in the casing. The signal generating device wirelessly transmits a pressure signal when pressure within the respective one of the pneumatic tires is not within a predetermined normal operating pressure range.

Abstract: The invention provides a method and apparatus for monitoring tires on a vehicle to detect adverse tire operating states, by continuously measuring the distance between the associated vehicle axle (or a vehicle body part rigidly connected thereto) and the road while the vehicle is in operation. From this measurement, the tire deflection is determined, which represents a comparatively exact measure of the respective tire load. When the tire deflection determined leaves a predetermined desired range, a warning signal is transmitted.

Abstract: A double tire inflation balancer and tire pressure indicator including a main body, a tire pressure indicator and an inflation tube. The tire pressure indicator is disposed in the main body and the main body is connected to the tire valve by an inflation hose. A pair of one-way valves formed by the round head rods and the small springs are provided in the main body, during inflation, the air first goes into the tire with less tire pressure. After the pressure of the inner tire is equalized with that of the outer tire, the two tires are then simultaneously inflated until the tire pressure reaches a normal pressure value. A transmission piston of the tire pressure indicator is compressed by the air, whereby a user can observe three indications of red, green and yellow colors of the front end of the transmission piston. The red color indicates insufficient tire pressure, the green color indicates normal tire pressure, while the yellow color indicates excessive tire pressure.

Abstract: A tire monitoring system is disclosed for a single or dual wheel tire assembly having a pair of analog/digital readout pressure gauges and associated valve stems for individually monitoring and pressurizing the tire or tires of the wheel assembly. The monitoring assembly may be located on a full wheel streamlined hub cap which can be mounted to the outside wheel of the dual wheel assembly by a U-shaped bracket connected to the wheel through the wheel bolts with the hub cap connected thereto by quarter turn fastener assemblies to insure a strong mounting to the wheel.

Abstract: The invention relates to an indicator device 1, especially for use as a manometer, with a housing 2 provided with an inlet for the pressurized medium to be measured and a spring-loaded piston 13 which can come into contact with the pressurized medium. The precision of the pressures indicated can be increased and the size can be made especially compact when the piston is designed as a control piston 13 and is in a working connection with an indicator element 5 via a groove and projection combination 39, 40 which translates the stroke of the control piston 13 into a rotating movement of the indicator element 5.

Abstract: A system and method that monitors four wheel sensors of an automotive vehicle to determined changes in the effective rolling radii of any wheel and a low pressure tire condition. Certain vehicle operating conditions, such as excessive or very low speeds, braking, and turns, are determined from the sensor outputs and are used to prevent erroneous detection of changes in effective rolling radii. Data from the sensors that is determined to be acceptable is accumulated over time as displacement values for each wheel. When the displacement values exceed a predetermined value, a metric function is used to compare differences detected in accumulated displacement values for the front pair of wheels and for the rear pair of wheels. If the difference between compared pairs of wheels is excessive, as compared with a predetermined baseline metric value, a low tire condition is detected.

Abstract: In accordance with a tire air-pressure reduction detecting apparatus of the present invention, if it is judged that the tires all have a normal air pressure, it is judged whether or not a count value (C) is not less than a steady-state count (L.sub.2), and then if the count value (C) is not less than the steady-state count (L.sub.2), a counter (CNT) is decremented. That is, the count value (C) is kept to the steady-state count (L.sub.2) at the lowest, from which incrementation is started. On the other hand, if it is judged that a tire air pressure is reduced, it is judged whether or not the count value(C) is less than an upper counting limit (L.sub.1), and then if the count value (C) is less than the upper counting limit (L.sub.1), the counter (CNT) is incremented. That is, the count value (C) is kept to the upper counting limit (L.sub.1) at the highest, from which decrementation is started. Then, if the count value (C) is not less than a warning threshold count (N.sub.

Abstract: A tire monitoring system, device and method are disclosed for detecting and indicating the presence of one or more predetermined abnormal conditions of tires on a vehicle. The system includes a plurality of monitoring devices (each of which is inserted in a different one of the vehicle tires to be monitored with the monitoring devices being unattached, and thus freely movable, when within the tire) and a receiver unit (mounted to be readily accessible, such as within the cab of the vehicle). Each monitoring device includes a sensor unit and an associated transmitter unit both of which are enclosed within a housing unit that is cushioned, as needed.

Abstract: A pressure indicator for tires comprised of a lower cylindrical housing dimensioned for removable coupling with a valve stem of a tire. A flexible diaphragm is disposed within the lower cylindrical housing. An upper cylindrical housing is coupled with the lower cylindrical housing. A T-shaped indicating pin extends through the upper cylindrical housing to couple with the flexible diaphragm. A tri-level spring is coupled around the T-shaped indicating pin. A magnifying dome couples with the upper cylindrical housing. The magnifying dome has an indicating chart positioned therein.

Abstract: A handheld detachable gas pressure gauge shaped like a hypodermic syringe. The gas pressure gauge has an upper pair of side arms mounted perpendicular to an inner cylinder and a lower pair of side arms each below and parallel to each of the upper pair of side arms. A socket in the inner cylinder has pivotal gripping fingers for grasping about a gas pressure valve. Compressing the upper and lower arms together moves the gripping fingers inwardly to grip about the valve which depresses a spring loaded valve core and allows pressure to be measured. Various embodiments use an extendible metering stick, a digital readout, and a dial gauge/Bourdon tube to measure the pressure. Extra attachments include an angled head for improved accessibility to valves located in confined areas, a side adapter socket for allowing gas to be added, a purge button to allow the gauge to release excessive gas pressure and a locking lever for allowing the gas pressure gauge to remain clamped about the valve.

Abstract: A pressure gauge reset mechanism including a cylinder having a pressure measuring head at one end, a piston forced by a first spring toward the pressure measuring head, a toothed pressure rod extending out of the cylinder, an actuating rod member having one end stopped at the piston and an opposite end fixedly connected to the toothed pressure rod, a second spring fixedly connected to the actuating rod member to push it upwards against the piston, and a pressure gauge coupled to the cylinder, the pressure gauge having an index shaft with a gear meshed with the toothed pressure rod, and a torsional spring mounted on the inside to hold down the index shaft and having one end stopped at the inside of the pressure gauge and an opposite end extending out of the pressure gauge and fixedly connected with a button, wherein the second spring member is compressed and the index shaft is turned by the toothed pressure rod to move the index of the pressure gauge when the piston is forced by the pressure being applied to t

Abstract: The present invention a tire valve cap pressure gauge comprises a hollow, cylindrical cap made of transparent material and having a series of pressure level markings, an inner piece and a valve stem. The inner piece having a cap top at its top end and a cap pin at its lower end is concentrically placed in the cylindrical cap, which is made of transparent material, and an inflatable diaphragm is internally attached to the inner piece and the cylindrical cap. The cap is then threadably attached to a valve stem found on typical tire, whereupon depressing the top portion of the inner piece causes the lower end of the inner piece to depress valve core inside the valve stem and thereby releasing the air inside the tire which in turn inflates the diaphragm. An indicator freely placed on the diaphragm rises with the inflating diaphragm and gives a tire pressure reading.

Abstract: Apparatus for visually indicating when the pressure of a pneumatic tire falls below a desired level includes a support and two arms independently slidably movable along the support. The arms are selectively locked against movement relative to the support and the arms are retractable for storage purposes. The invention also encompasses a method of utilizing the apparatus to monitor the pressure of a pneumatic tire.

Abstract: A process for monitoring tire pressure by comparing and evaluating the rotating speeds of the individual wheels of the vehicle which is based on the formation of speed correction factors. The values of the individual correction factors, correlations between the correction factors for typical travel situations, and tolerances for the correction factors, which depend on the actual travel situation, are determined during a learning phase (i.e. phase 1). The deviations of the correction factors from the learned values are determined and evaluated during a subsequent identification phase (i.e. phase 2), taking into account the travel situation-dependent tolerances and the progression of the learning process.

Abstract: A tire pressure detector includes a casing that receives a battery unit and a signal generating unit therein and that is provided with an adaptor to engage an inflating valve of a tire. A switch unit is mounted in the adaptor for connecting electrically the battery unit and the signal generating unit, and includes a resilient disc member with a peripheral portion secured to an inner wall of the adaptor, and a central portion moving in accordance with pressure inside the tire. An annular conductive piece is disposed on an inward protrusion of the adaptor and is connected to the signal generating unit. A conductive tubular body is disposed on the central portion of the disc member and extends slidably through the inward protrusion of the adaptor. The tubular body has a peripheral flange projecting outwardly from an upper end thereof and extending above the conductive piece. A hollow conductive seat member is mounted in the adaptor above the tubular body. The seat member is connected to the battery unit.

Abstract: A tire air pressure warning device for dual tires mounted on a common hub of a vehicle comprises a housing mounted on a hub component and having first and second pressure sensors connected in flow communication with a corresponding one of the vehicle tires. A first indicator is pivotally mounted on the housing for displacement between stored and actuated positions, and a second indicator is mounted on the first indicator for displacement therewith and for pivotal displacement relative thereto in response to displacement of the first indicator from the stored to the actuated position thereof.

Abstract: An Automatic Tire Pressure Control System (APS) compensates for fluctuations in the air pressure and temperature of vehicle tires and automatically adjusts the tire pressure. This provides the vehicle operator with a convenient means to automatically regulate the pressure of a vehicles' tires for optimum safety and performance. The system provides nonwearing ferrofluid seals for zero air leakage and a special axle sleeve with multiple air channels for reduced inflation time and an air flow path that is isolated from lubricants, an air compressor powered by a vehicle engine and a microprocessor controlled distributor which distributes air to each tire, depending on a tire pressure and temperature sensor signalling air and temperature requirements. A tire venting system is also provided.

Abstract: A device for monitoring tires, including a central processing unit and for ach wheel a measuring sensor connected by an electrical connection to a mobile antenna integral with a hub of the wheel as well as a stationary antenna integral with the hub carrier of the wheel and coupled to the stationary antenna. The central processing unit supplies the sensor with power and analyzes the measurement signals of the sensor. The electrical connection includes at least one electric conductor passing through a bolt for fastening the wheel on the hub.

Abstract: A visual tire cap pressure gauge which comprises a cap member. A structure within the cap member is for securing the cap member to a valve stem on a tire in a motor vehicle. A lens is mounted in a top end of the cap member. An assembly within the cap member is for visually indicating when air pressure within the tire drops below a set point, so as to enable a person at a glance to tell if the tire needs more air.

Abstract: A valve cap is screwed onto a pneumatic tire and generates an indication whether a prefilled tire pressure is still existent or not. For this purpose a valve cap (1) comprises a deflectable diaphragm (30) in an inner housing separating a pressure chamber from a reference pressure chamber. The reference pressure chamber registers the prefilled tire pressure. The diaphragm (30) is deflected toward the closed housing end when the actual existent tire pressure drops in comparison with the registered tire pressure. Onto the diaphragm (30) a permanent magnet (40) is placed, which can be in a first position (normal position of the diaphragm) or in a second position adjacent to the housing end. The check of the magnet position and the generation of an indication signal indicative of the actual tire pressure status will be executed by a hand device, which must be brought into a defined position with respect to the valve cap.

Abstract: A truck tire/wheel assembly detection system in which the moving thermal dynamics of a truck are measured before cooling off, by passing over and around contact or non-contact thermometers directed toward the tire/wheel assembly and transmits the approximate temperature of each tire/wheel assembly to a computer which will compares the output data and identifies each abnormally overheated tire/wheel assembly and print out location on rig and other information that may be required. A modem controlled by the computer is used to advise other interested parties of rig condition at this check out point.

Abstract: A tire pressure indicator is provided which has a screw-threaded socket for long term but removable association with a tire valve. The body of the indicator houses a movable operator member; actuator member; and resilient member located between the operator member and actuator member. The arrangement is such that the actuator member is held in a "rest" position by the resilient means which is compressed when the actuator member is moved to a "test" position. The degree of compression and resilience of the resilient means are arranged such that the air release pin of the tire valve is depressed only in the event of air pressure in the tire being inadequate to counter the force exerted thereon through the resilient means. The sound of the air escaping in the "test" position is indicative of a low tire pressure.

Abstract: A system for monitoring the steady state condition of a motor vehicle shock absorber is used to identify conditions in which a tire may be under- or over-inflated, or in which a shock absorber needs adjustment or replacing. A device for measuring distance, such as a measuring tape, is affixed along the length of a movable portion of a shock absorber, and is monitored by a shock absorber sensor, which is mounted in a fixed position relative to the measuring device. The vertical distance through which the movable portion of the shock absorber moves and the velocity of the oscillations of said movable portion is thereby monitored, and data is transmitted from the sensor to a circuit for transforming said data into a visual display for visual monitoring by the vehicle driver. Said data is further sent through a comparator circuit for comparing to other data received simultaneously from at least one other sensor similarly mounted in relation to another shock absorber of the vehicle.

Abstract: A tire pressure management system including a tire condition monitor connected to the tire so as to be interactive with air pressure in the tire and for selectively measuring a pressure in the tire, a controller, and a display. The tire condition monitor includes a transmitter and a receiver. The controller also has a transmitter and a receiver connected thereto. The transmitter of the controller serves to transmit a first radio signal to the receiver of the tire condition monitor. The receiver of the controller serves to receive a second radio signal from the transmitter of the tire condition monitor. The display is connected to the controller so as to display a humanly perceivable indication of a condition of the tire. An air compressor is mounted to a wheel of the tire so as to deliver air to an interior of the tire when the pressure of the tire is below a predetermined value.

Abstract: A tire air pressure system is disclosed for continuously monitoring the pressure of air in an inflatable tire of a vehicle or aircraft, and activating an audio and/or visual alarm when the air pressure drops below a predetermined level. An electrically conducting sensor is attached to a tire valve stem, and a decrease in air pressure causes a normally electrically insulated, spring biased piston to contact the sensor, thereby grounding the piston. The piston is electrically connected to an insulated disk having a conducting ring, mounted between a wheel and a hub. A contact brush disposed at the ring is connected to an alarm maintained at positive potential.

Abstract: A tire pressure warning system for use under a frame of a tandem axle vehicle comprising a plurality of springs, each spring having one end adapted to be coupled to an equalizer mechanism and the other end adapted to be coupled to the frame, an equalizing mechanism for equalizing the position of each spring relative to each axle when the pressure in the tires on each axle has been set, and an indicator mechanism coupled to the equalizing mechanism for determining and showing when the equalizing mechanism has been displaced, whereby providing confirmation of lost tire pressure.

Abstract: A qualitative indication of the pressure in a pneumatic tire is provided by a sliding marker in a sleeve. The marker moves in a chamber formed by a hollow lens closing one end of the sleeve and a diaphragm within the sleeve. A spring forces the marker toward the diaphragm and air pressure from the tire is applied to the opposite side of the diaphragm from the marker. A pressure above a predetermined amount is indicated by the end of the marker substantially filling the hollow lens and a pressure below the predetermined amount is indicated by the end of the marker withdrawing into the sleeve.

Abstract: A tire pressure indicator which includes a valve stem over-pressure indicator and a valve stem cap under-pressure indicator. The valve stem includes an air porting scheme that releases over-inflation air for escape through a whistling reed configuration. The valve stem cap includes a top translucent panel for coaction with a diaphragm spring contained therebelow. Normal tire pressure distends the diaphragm spring to an upward convex attitude in contact with the underside of the translucent panel to project a visual indicator.

Abstract: Device (1, 2, 3, 4) for warning of the under-inflation of a tire, mounted the wheel of the tire, includes a stationary element (10, 71) with two inner chambers (11, 12, 73, 74), one (11, 73) of which is brought to the inflation pressure, the other (12, 74) to the atmospheric pressure, and a centrifugal mass (20, 72). A blocking device (30, 90) blocks any displacement of centrifugal mass (20, 72) when the inflation pressure is greater than a certain threshold and frees the centrifugal mass (20, 72) when the inflation pressure decreases below the inflation threshold. Centrifugal mass (20, 72) can then become off-centered under the effect of centrifugal forces and creates a dynamic imbalance able to be sensed by the driver of the vehicle.

Abstract: An indicator gauge may utilize a motion amplifying gauge movement. The motion amplifying mechanism makes it possible for a diaphragm-type pressure gauge to provide large angular displacements for an indicating pointer. The indicator gauge may be configured to have a maximum readout visibility in the range from about 0.degree. to about 270.degree.. A single-piece crankshaft located on an adjustable mounting translates the short range of motion of a diaphragm button to a pivotal gear segment. The crankshaft may be configured as a C-shaped crankshaft or an L-shaped crankshaft. The pivotal gear segment may be wedge-shaped or have an extension arm for contact with the crankshaft. The crankshaft may also contact a downwardly or upwardly extending boss located on the pivotal gear segment.

Abstract: An indicator housing is arranged in operative communication to a plurality of sensor housings, each mounted to a backing plate of an associated vehicle, such that each sensor housing includes a sensor rod reciprocatingly and slidably projecting from the sensor housing, such that upon the respective tire relative to each sensor housing losing air pressure and bulging, deflection of the sensor rod is indicated within the vehicle through the indicator housing.

Abstract: A method and apparatus for detecting a partially deflated tire on a vehicle having four tires each mounted on a wheel. Each wheel being provided with a signal generator for producing a series of digital signals or pulses spaced apart by equal increments by angular rotation of the respective tire and wheel assembly characterized by calculating from one of the series of signals reflective of the vehicle speed. The method includes selecting an appropriate interval for deflation detection, measuring the speed of rotation for each of the four wheels, storing the speeds found, repeating the measuring step for at least three consecutive successive equal intervals, averaging the speeds to produce an average speed signal for each wheel, processing the four signals in a processing unit which subtracts the sum of the signals from one pair of diagonally opposite wheels from the sum of the signal from the other pair of diagonally opposite wheels, sensing when the magnitude of the result is between 0.05% and 0.

Abstract: A device for optically displaying the pressure of a medium comprises a housing, a piston within the housing which is movable along a longitudinal axis against a restoring force, and an optically transparent element within the housing having a display surface which is visible from outside the housing. An inner wall of the optically transparent element delimits a cavity which is open towards the piston. A surface of a first color, e.g., green, is mounted on the piston and is movable therewith, the colored surface being received within the cavity of the optically transparent element. The optically transparent element includes a circumferential zone of a second color, e.g., red, which colored zone is not directly visible from outside the housing through the display surface.