Abstract: Method and system for measuring and adjusting pressure of tires of vehicles in order to set the appropriate pressure to a tire when the latter is in temperature and pressure conditions different from nominal conditions, the method and system comprising the steps of measuring the pressure inside the tire, measuring the temperature inside the tire, calculating a pressure value equivalent to the nominal value as a function of said measured values, visualizing the measured values, introducing said values in an air supplying machines, and supplying said calculated pressure to the tire.

Abstract: The present invention is related to air pressure valve stems and gauges. More particularly, this invention relates particularly to tire stem valves possessing a built-in calibrated air pressure regulator and an optional integrated air pressure indicator.

Abstract: An inflation valve provided to inflate a cycle tire assembled without an air tube on a rim. The valve has a body crossed by a conduit, with a first part being designed to cross the casing of the rim, and a second part adapted to connect an inflating means. The valve has an injection nozzle located in the extension of the first part, a sealing joint located around the injection nozzle, and in that the first part or nozzle has an assembly device designed to cooperate with the complementary assembly device of the rim.

Abstract: A rotary union assembly for use in an automatic tire inflation system for maintaining the desired pressure in the tires on a tractor trailer or other vehicle having pressurized axles. The assembly communicates the valve stems on a pair of adjacent tires with the axle interior through the use of a flexible tube extending between a stationary first fitting threadably engaged in the axle spindle and a rotary housing secured against the outside end surface of the hub cap so as to be positioned exteriorly of the wheel lubrication compartment and rotatable with the hub cap. The first fitting defines an open channel extending axially therethrough and includes an o-ring seal extending about the channel and forming an airtight seal within the fitting about the tube.

Abstract: A tire pressure control system and method includes a pneumatic control unit, a pressure sensor, a rotary seal associated the tire and a wheel valve rotating with the tire. The system is connected to a compressed air source and the control unit is connected through a connecting line and the rotary seal with the wheel valve. The position of the wheel valve is a function of the pressure in the connecting line. To inflate and vent a tire and to reduce the number of components, the wheel valve has a closed position, an open position wherein a connection is established between the control unit and the tire, and a venting position that opens to the atmosphere. The wheel valve is maintained in its open position as long as an inflation pressure exists in the connecting line. The wheel valve moves into its venting position as long as the pressure in the connecting line that exceeds the inflation pressure by at least a pre-determined value.

Abstract: A fast and accurate pressure charge controller to inflate a tire or a pressure container to a desired pressure with an air or a gas compressor supplied pressure without regulation of the supplied pressure and without using a pressure gauge or any hand-held pressure measurement device to measure the charged pressure at the vicinity of the tire or the container, to stop charging and to send out either an audio or a visual signal when desired tire or the container's pressure is reached. The controller is also able to release over charged tires or pressure containers to desired pressure.

Abstract: The invention provides apparatus and methods for injecting fluid such as sealing and balancing fluid into tires while they are inflated and mounted on wheels and especially for two tires mounted on a dual rim wheel. The invention overcomes problems of limited access to the valve stems and includes tools for bending the stem in place to facilitate application of the apparatus.

Abstract: A device for maintaining inflation pressure within a tire interior of a tire mounted on a rotating wheel with a rim. The device includes a compressor with piston penetrateably mountable on the wheel rim or in communication with a valve stem that incorporates air delivery to the compressor as mounted within the tire. The piston is in communication with a compressible piston driver having a distal end in contact with the inner floor of the mounted tire where the outer side of the tire contacts the ground once every revolution of the wheel. Repeated deformation of the rotating tire where it contacts the ground outside the distal end of the driver is transferred to the air compressor through a piston compression stroke. When such ground contact is not occurring, centrifugal force causes radial movement to accomplish the intake stroke of the piston. In this repetitious manner a small amount of air is forced into the tire during each rotation thereof when needed to maintain desired inflation pressure.

Abstract: A tire inflation apparatus and method involves first evacuating a seated pneumatic tire via a vacuum pump and then inflating the tire with a purified, dried gas under pressure, such as pressurized nitrogen, without allowing any ambient air to reenter the evacuated tire. The apparatus includes a three way valve which attaches to the source of compressed dry gas, to the tire valve, and to the vacuum pump with a micron vacuum gauge provided for monitoring the state of vacuum within the evacuated tire.

Abstract: Apparatus injects fluid such as sealing and balancing fluid into inflated tires, even two tires on a dual rim wheel, while on a vehicle. It seals to the valve stem so that the valve core can be unscrewed and retracted under pressure, providing an unobstructed fluid injection path before replacing the core without significant pressure loss. Tools for bending tire stems in situ facilitate apparatus installation.

Abstract: An inflator device uses a compressed gas cylinder or cartridge for inflating a tire or the like having an inflator valve. It has an internally screwthreaded supply bore adapted to have screwed into it the neck of the cylinder or the cartridge closed by a capsule and at the bottom of which is provided a perforator surrounded by a supply seal. The supply bore communicates via an axial hole with a distribution bore, the communication being controlled by a selectively operated valve carried by a distributor moveable axially. The device further includes a cavity adapted to receive in sealed fashion the inflator valve of the tire or the like and communicating with the distribution bore. The seal is assured by a valve seal which has two coaxial circular parts joined by a transverse annular part. The valve seal is placed in the cavity with the annular part facing outwards and held in the cavity by a cap provided with a passage for the valve of the tire or the like.

Abstract: An apparatus for inflating a deflated member from a source of compressed air includes a flexible tube member having a first end and a second end; a first coupling at the first end of the tube for connecting to the deflated member; and a second coupling, different from the first coupling, at the second end of the tube for connecting to the source of compressed air; wherein the first coupling includes a check valve for preventing flow from the deflated member to the tube, whereby the first coupling can be connected to the deflated member and the second coupling can be sequentially connected to a plurality of sources of compressed air.

Abstract: A computer based system for adjusting the pressure in pneumatic tires prompts the operator for pressure and vehicle type information. Comparison of vehicle type with predetermined pressure ranges is used to detect erroneously entered pressure values. A remote pressure sensor is used together with a intermittent inflation/deflation schedule to permit equalization of the hose and tire pressure without metering valves. The sampling rate of pressure in the schedule is based on total tire volume input by the user or deduced from the inflation rate.

Abstract: An on-board storable system for repairing a flat tire on an automobile comprising a utensil adapted to endow a power impact wrench to actuate a scissors jack. Such system preferably includes an air compressor for inflation of a replacement tire after mounting the wheel bearing the replacement tire has been secured to the hub with the impact wrench. An alternative system utilizing the utensil and a power impact wrench comprises an air reservoir; compressor; electro-mechanical means for driving the compressor; a pneumatic distribution system; the pneumatic distribution system conveying air from said reservoir to an air distribution post for each wheel of the automobile; and tubular means for conveying air from said posts to a tire proximate each said post. The electro-mechanical power transmission means being selected from the group comprising an engine driven belt powered pulley; an auxiliary battery and associated electric motor; and an electric motor driven by the automobile electric system.

Abstract: A tire valve extension attachment connected to tire valve for fascilitating inflation of the tire. The extension attachment comprises a housing, a top element an upper holder element, a lower holder element and a depressing rod, wherein the depressing rod is passed through both holder members and fixedly connected with the top element; the holder members each have protrusions surrounding the depressing rod to limit the transverse movement of the depressing rod. The top element, when the extension attachment is connected to an air pump, is depressed and allows air to pass into the extension attachment from an aperture formed between the top element and the housing and finally through the tire valve to inflate the tire, the depressing rod being simultaneously depressed so as to force the tire valve to open. Every two adjacent protrusions of the holder members have a vent hole in between for air to pass through the holder members in inflating the tire.

Abstract: A dual tire assembly including a first tire defining a first interior space; a second tire defining a second interior space; and a tire pressurization assembly including a manifold having a first inlet, a first chamber communicable with the first inlet and the first interior space, a second inlet, a second chamber communicable with the second inlet and the second interior space, a by-pass passage communicating between the first and second chambers, and a flow regulator housed by the by-pass passage.

Abstract: A portable tire valve extension is disclosed which is capable of enabling the inflation of an inner tire while it remains mounted to a second outer tire, as is often the case with many trucks, buses, recreational vehicles, and motor homes. A cylinder including an air valve (of identical size, shape, and configuration as is traditionally used on a tire) is located at one end of the cylinder, and an air valve (of identical size, shape, and configuration as is traditionally used on an air pump) is located at a second end. In a preferred embodiment, the cylinder is of approximately 12 inches in length and 1/4 inch in diameter, so as to allow it to fit through the rim of the outer tire to access the inner tire valve.

Abstract: The valve of a spare tire (1) has a 1 meter flexible extension to allow easier inflation. The extension comprises a flexible tube (4) having an air-supply adaptor (6) at one end and a tire valve connector (5) at the other end. A cord is inserted within the tube which maintains an open passage for air when the tube is kinked at a bend or is squeezed from load. A finger plate allows comfortable support of the air-supply adaptor when it is pressed against an air-supply nozzle.

Abstract: A method and system for monitoring and measuring the amount of deflection of a pneumatic tire wherein said monitoring system in the tire detects tire sidewall deflection by measuring the length of the tire contact patch area relative to the total circumference of the tire. The embedded sensor device generates a signal which varies as it passes through the tire contact patch within the tire on a moving vehicle. If the vehicle is moving at a constant speed, the ratio of time which the sensor spends inside the contact patch to the time the sensor spends outside the contact patch is proportional to tire deflection. Sensor electrical signals are digitized and counted to determine deflection, tire speed and the number of tire revolutions to improve performance of both the tire and the vehicle.

Abstract: A bicycle pump and tire repair apparatus incorporating into a single unit an air pump for inflating a bicycle tire, a tire lever for removing a tire from a bicycle rim, a spoke wrench for repairing and adjusting the spokes of a rim, and a compartment for storing a patch for repairing a punctured bicycle tire is disclosed. The air pump is compactly designed for carrying on a bicycle. A thumblock on the head of the pump performs a dual function of locking the nozzle of the pump onto the valve of a tire being inflated, and it functions as a tire removal lever. A cap on the head of the pump has a knurled surface for abrading an inner tube to prepare it for application of a patch. A slot in the pump handle holds a second tire lever, and a compartment in the end cap of the handle stores a self-adhesive patch for repairing a punctured tire.

Abstract: Improved valve presents a threaded end, suitable for permitting the positioning of a valve core which is in charge of performing the opening or closing of the passage of air. Over the end threaded portion, a device is mounted with assembly for closing the mouth of the valve and for actuating the valve core, the device including a main body, or a main body and an external body coupleable with each other, a rod and a spring. The device presents a mouth of preferably trunco-conical shape and various peripheral external ribs. The rod presents a cylindrical shape having at the rear end an axial orifice, and at the front end a head preferably of trunco-conical shape, the valve permitting the charging and discharging operation of air in a tire, capable of performing an air-tight closure caused by the action of a toric joint mounted on the pushing rod of the valve.

Abstract: Damping of the bounce in elastomeric tires is desirable to eliminate the tendency of a machine, such as a loader, to lope or bounce when carrying a load for a distance. The subject invention substantially reduces the lope or bounce by filling the cavity or closed chamber of a tire of a wheel assembly with a liquid, mounting an accumulator to a rim, and controllably interconnecting the closed chamber and the accumulator. By controlling the rate of fluid flow between the closed chamber and the accumulator, the elastomeric tire retains some resiliency while forcing the springs and shock absorbers of the machine to control the tendency for the machine to bounce or lope.

Abstract: A digital computer computes the optimum air pressure in the tires of a vehicle which minimizes fuel consumption, tire wear, and road deterioration, and transmits to a pressurized air supply system an output signal for adjusting the tire pressure to this optimum tire pressure. The computer uses input from sensors including both vehicle speed and acceleration.

Abstract: A vehicular tire air pressurization system having an intelligent controller is connected to one or more manifolds each connected to at least one set of tires with the controller for selecting current operation conditions and controlling the manifolds to maintain tire pressure at desire air pressures, the controller having non volatile memory for storing dynamic parameters used to control manifolds having inflation and deflation valves for pressurizing the sets of tires to the desired pressures subject to dynamic parameters which are field programmable and which may be updated after each pressure adjustment cycle so that the tires are efficiently pressurized to the desired pressures even during changing dynamic characteristics caused by changing conditions such as temperature, altitude and tire wear, the non volatile memory is also for storing operational data after installation to reselect operating functions and to reset operating parameters.

Abstract: A vehicular tire air pressurization system having an intelligent controller for macro control is connected to one or more intelligent manifolds for micro control so as to distributively process air pressurization functions, with the controller having non volatile memory which is field programmable and alterable for storing current operating conditions, functions and parameters for communicating desired air pressures to the manifolds each connected to at least one set of tires and each including non volatile memory for storing pressurization parameters used to control inflation and deflation of the sets of tires to the desired pressures subject to the pressurization parameters which are also field programmable and alterable and which are updated after periodic pressure adjustment cycles, so that, the tires are efficiently pressurized and maintained at the desired pressures even during changing performance characteristics.

Abstract: A computer based system for adjusting the pressure in pneumatic tires prompts the operator for pressure and vehicle type information. Comparison of vehicle type with predetermined pressure ranges is used to detect erroneously entered pressure values. A display device visually indicates the operation sequence along with displaying pressure and system error and operator error messages. A remote pressure sensor is used together with a intermittent inflation/deflation schedule to permit equalization of the hose and tire pressure without metering valves. Monitoring historical hose pressure is used to detect a number of failure modes.

Abstract: An improved all-weather vehicle tire having traction enhancing studs located in a position outside the normal tread area which allows a vehicle operator to selectively choose operation as a conventional tire on dry roads or as a studded tire on ice-coated roads by the simple expedient of reducing or increasing the air pressure within the tire. Specifically designed for areas which experience ice storms or freezing rain which remains on roadways for relatively short periods of time, the tire provides excellent traction on ice, yet may be quickly and conveniently returned to conventional tire operation with little effort by the vehicle operator.

Abstract: The described device maintains an equal pressure in each associated tire as long as that pressure is above an adjustable, threshold amount and isolates the tires when the pressure attempts to go below the threshold. The apparatus comprises a body with ports (each communicating with a tire) having in series a conventional tire valve (each of which is actuated simultaneously by one pressure sensitive piston). One end of each of the conventional tire valves communicates with a chamber in the body that can be pressurized.

Abstract: An improved central tire inflation system wherein positive air pressure is used to control the air pressure in the associated vehicle tire includes a vehicle wheel assembly having a tire mounted thereon and defining a pressurized tire air chamber, and a positive pressure air source. A normally closed inflation valve is connected between the tire air chamber and the positive pressure air source, and a normally closed deflation valve is connected between the tire air chamber and the atmosphere. A control valve selectively actuated by a central control unit is provided to operatively connect the inflation valve and the deflation valve to the positive pressure air source. The system further includes a sensor for measuring the tire pressure in the tire air chamber. The sensor is operative to generate a signal corresponding to the air pressure in the tire air chamber to the central control unit.

Abstract: A pressure relief valve (61) including a body (110, 114) interconnecting an inflatable volume (20a,22a) with a source of pressurized fluid (30) and the atmosphere. A pair of valve members (120, 122) cooperate to allow controlled inflation and deflation of the volumes (20a,22a) as well as to close off the fluid path between the source and the volumes and vent fluid from the volumes to the atmosphere in order to achieve at least two predetermined fluid pressures in the volume.

Abstract: An apparatus for adjusting and controlling air pressure in pneumatic vehicle tires. The apparatus, which is microcomputer based, automatically checks tire pressure, checks for tire and system leaks and controllably inflates and deflates the tires as conditions warrant. The apparatus also includes unique tire inflation valves which are designed to accommodate high levels of particulate contamination within the system.

Abstract: An air inflation system for attachment to rotating wheels having outwardly directed studs for inflating a tire thereon. An elongate support is threadably attached to a stud on the wheel for supporting the support. An adjustable arm is rotatably connected to the support and in turn supports a rotatable air coupling. An air supply line is connected to the coupling and an outlet line from the coupling supplies air to a tire on the wheel.

Abstract: A tire inflation pressure sensor mounted on the outside of the wheel. The sensor housing includes a diaphragm, a cylinder, a magnet holder, a spring, a magnet holding member connected with a magnet, a guide member and a stopper. When the inflation pressure of a tire is normal, the magnet holding member stops at a position where the magnet indicates a north pole. When the inflation pressure goes down below a specified value, the magnet holding member travels a predetermined distance and at the same time the magnet holding member rotates at a predetermined angle indicating a south pole. This changeover of magnetic polarity is detected by an external magnetic induction element to operate a warning device.

Abstract: System for inflating tires comprised of a pressure air supply apparatus with a series of push-buttons (2) for different pressures and completed with a series of collars (6) which may be mounted on the outside of the valve of the tire with identification or characteristics which match those of one of the push-buttons. The pressure air supply apparatus includes a control unit (12) which acts on a pressure inlet electrovalve (93) or on a pressure discharge electrovalve (95) said control unit (12) having an amplifier (14), a transducer (13), a converter (15) and a zero adjusting circuit formed by two potentiometers (16). Two air supply hoses (9) are each fitted at their ends with a mouthpiece (10) terminated by clamping elements which tend to move towards one of the inclined grooves (20) through the action of a pushing element (22) biased by a spring (23).

Abstract: An adaptive tire pressure control strategy for a central tire inflation system 10 wherein the programmed demand pressure setting P.sub.D may be increased automatically if certain criteria are met. These criteria are indicative of a running condition wherein tire temperature may be increasing to unacceptable levels due to underinflation. Additionally, air may also be added to tires in this condition in order to increase the load capacity of the tire, reduce tire temperature and prolong tire life.

Abstract: An apparatus for inflating inflatable articles, such as bicycle tire inner tubes, and for securing mobile articles, such as bicycles, to other objects. In one preferred embodiment, a first length of cable and a second length of cable are kept within a housing until needed to secure the article to an object. A cable holding sleeve holds the lengths of cable in a substantially side-by-side relationship when the cables are within the housing. When needed, the lengths of cable are withdrawn from the housing, passed through the frame of the article, around the object and the two ends of the cables are locked together by way of, for example, a cylindrical combination lock. When the first and second lengths of cable are unlocked, a constant tension spring, provided in some embodiments, retracts the lengths of cable back into the housing. Other embodiments of the invention are provided with a pump piston at the end of the lengths of cable which remain within the housing.

Abstract: Multiple tires are mounted adjacently parallel to each other on a single wheel. Respective inner spaces of the multiple tires communicate with each other by way of an airflow pipe for the transfer of air. The airflow pipe includes a pneumatic pressure control valve that opens or closes in response to air leaking from one or more of the multiple tires. When one of the multiple tires leaks air rapidly, the pneumatic pressure of the other normal tire decreases, thereby forcing the driver to notice the puncture. If one tire leaks air slowly, its air is replenished from another tire. Thus the respective pneumatic pressures of the individual tires become equal, whereby the driver can continue to drive for a time without risking the serious accident that could occur if he were unaware of the leak.

Abstract: An apparatus, method and vehicle in which the tires operate in accordance with stiff modes in order to increase the damping of their oscillations, the tires being filled practically completely with non-compressible fluid and being subject to the establishing of communications between at least one pair by connections filled with a constant volume of non-compressible fluid.

Abstract: A gas transfer system is provided for establishing or maintaining a predetermined gas pressure within a plenum, such as a tire. In an exemplary embodiment, the gas transfer system includes a power source, a pressure sensor, a control unit, and a gas transfer mechanism. Preferably, a gas transfer mechanism includes a micromechanical device, comprising one or more pumping units that transfer gas from one pressure zone to another. In one embodiment, pumping is accomplished, in part, by heating the gas within a sealable chamber of a pumping unit to cause the pressure of the gas to increase. In another embodiment, the change in pressure of the gas caused by compression of a tire provides a pumping force. Valves are provided for regulating movement of the gas through the gas transfer mechanism and can include electromechanical valves responsive to signals from the control unit, or passively biased valves responsive to applied gas pressure.

Abstract: Flatproofing liquid is provided to tires through a one-way disposable valve assembly. In accordance with the method, the valve stem core is removed from the tire to allow the liquid to be freely admitted. A one-way valve is attached to the valve stem, and the tire is filled with the flatproofing material. The flatproofing material is then allowed to cure in the tire and in the valve. After curing, the valve is removed and discarded. The apparatus includes an inexpensive one-way valve for connection to the valve stem at one end and supply hoses at the other.

Abstract: A central tire inflation system for vehicles including but not limited to trailers of tractor-trailer rigs is provided. The system requires no modification to the wheel hubs or axle tubes and therefore may be incorporated as original equipment or in the form of retrofit kits. Communication is provided between a pressurized air reservoir through the axle tubes and through a spindle sleeve disposed on the end of each tube into a sealed chamber. The chamber is defined by the spindle hub, hub cover, rotary seal and spindle sleeve or seal carrier attached to a spindle nut. The seal carrier encloses the end of the axle. At least one air passageway is provided in the spindle hub which provides communication to the wheel valves. The control system includes a plurality of multi-port two-way pneumatic valves.

Abstract: An apparatus for regulating the pneumatic pressure of a tire according to the invention calculates the pressure difference between the specified pneumatic pressure entered therein through an input section and the actual pneumatic pressure of a tire measured by a pressure sensor and operates its air charging or discharging valve by specifying an extent of openness of the valve and a time for keeping the valve open as a function of the obtained pressure difference. Thereafter, it calculates the rate of change in the pneumatic pressure of the tire from the actual pneumatic pressure of the tire measured for the second time during the valve is kept open and, at the same time, the pressure difference between the specified pneumatic pressure value and the actual pneumatic pressure of the tire measured for the second time.

Abstract: An automobile tire inflator that embodies an air-flow passage way with two identical air chuck adapters, one attached at each end of the passage way, and an air-flow cut-off clip that can be closed or opened by hand attached to the air-flow passage way so as to open or close the air-flow passage way to the flow of air.

Abstract: A self-contained anti-skid device to be used with a pneumatic tire (32) for boosting traction against slippery roadways covered with ice and snow while all designated characteristics of the tire against other road conditions are fully preserved, comprising: a plurality of projectable and retractable anti-skid pins (20) to be positioned radially at a tread (34) of the tire (32) for being projected from the tread (34), as often as required, when a plurality of expandable pneumatic chambers (26) adjacent to the pins (20) are pressurized using merely a fraction of the actual pressurized air of the tire (32). To retract the pins (20), air from the expandable pneumatic chambers (26) is released and preferably recycled back into the tire (32) through an air recycling device (64) implanted within the tread (34) and actuated by rotation of the tire (32) on a roadway. An air valve directs a flow of air from the tire (32) to the expandable pneumatic chambers (26) and therefrom preferably to an air recycling device.

Abstract: A control system and method for controlling deflation operations in a CTIS (10, 200). During deflation to a selected pressure (P.sub.D), the tires will be deflated to a target pressure (P.sub.T) lower than the selected pressure and then inflated to the selected pressure.

Abstract: A tire structure includes bag-like members capable of expansion and contraction and which are buried in anti-slip grooves in the tire surface, and an air supply coupled to the bag-like members for supplying air to inflate the bag-like members to cause them to expand and project outwardly of the tire surface. The air supply may include stems coupled to an air source in the wheel part of the tire structure. Normally, the tire structure can be run as a usual tire. When running on a frozen road or the like, the tire structure permits functions and effects like a tire with a chain coupled thereto to be obtained by a simple operation to inflate and expand the bag-like members to cause them to project outwardly of the tire surface, and without need of any cumbersome operation of mounting a chain to the tire.

Abstract: Apparatus for use in co-operation with a conventional tire inflation valve which enables the pressure in a tire to be reduced to a pre-determined value in a one step process. A movable pressure regulator member, comprising a pin and slot arrangement, co-operates with a valve regulating spring to close a valve member, once the pressure in the tire has reached the required valve.

Abstract: An air inflation system for tires on a vehicle having at least one driven axle in which the axle includes a longitudinal extending air passageway connected to each tire at the end of the axle and a rotatable air coupling connected between an air line and the air passageway. The coupling includes a stationary tubular sleeve surrounding the axle and first and second seals, respectively, at opposite ends of the sleeve in which the seals rotate with the axle and sealingly engage the axle. The seals are biased into engagement with the sleeve. Preferably, the ends of the sleeve and the coacting seals include beveled sealing surfaces.

Abstract: An apparatus for adjusting the air pressure in a vehicle tire is provided. The apparatus includes an air source, a manifold, a transducer, a valve, and a controller. The valve includes a valve seat with a first and a second chamber and a piston which is movable reciprocally with the valve body between the two chambers. The valve also includes a poppet that is movable between the two chambers relative to the piston with a wobbling action. The piston is connected to the valve body by a deformable diaphragm.

Abstract: An apparatus provides individual vehicle motorists with a simple, low-cost way to adjust and balance the pressure within their individual vehicle's tires without accidentally exceeding the maximum pressure level of the tires. The apparatus, interconnects the four tires with itself, and a pressure gauge and a conventional tire air-valve permits the internal air pressure of all four tires to be adjusted uniformly from one air source through a unique low cost combination of a commercial connector and a specially designed shut-off valve and to be disconnected without a loss of air in any of the four tires. If a pre-set air pressure level has been exceeded while air is being pumped into the tires, a safety air pressure-relief valve, coupled to a whistle, is triggered, notifying the motorist of this condition.