Abstract: The present invention is a tire inspection device for a tire wheel made from nonmetallic material having a detecting part fitted inside the wheel. The detecting part is equipped with a sensor for detecting the tire internal pressure, the strain of the wheel and the like, and also an electric circuit for conveying out of the wheel an electric signal corresponding to the tire state sensed by the sensor.

Abstract: A device for inspecting the pressure, temperature, etc. in a tire includes a pressure sensor attached to a valve mounted on the tire rim and having an output that varies depending upon the tire internal pressure, and a resonator including a resonant coil and capacitor which resonates in the presence of an external radiation electromagnetic wave. An oscillation coil of an oscillator which generates the external radiation electromagnetic wave projects from the main body of the inspection device. The main body encloses a signal processor which detects and processes any change in oscillation state which has taken place at the oscillator, as caused by the resonance state of the resonator, and a display to display the result of the signal processing by the signal processor.

Abstract: An air spring comprises a substantially tapered flexible air sleeve, a piston connected to the small-diameter portion of the air sleeve, and an end cap connected to the large-diameter portion of the air sleeve. In this air spring after the inflation, the length of freely deformable portion of the air sleeve is longest at a position in its peripheral direction and shortest at a position opposite to the longest position in radial direction and is gradually changed between the longest position and the shortest position.

Abstract: A tire inner pressure drop alarming device comprises an oscillation section mounted on a vehicle body in the vicinity of a vehicle wheel, a resonance section mounted on a peripheral portion of a tire and including a resonance coil, a signal processing and alarming section mounted on the vehicle body in spaced relation with the vehicle wheel, and a coaxial cable connecting the oscillation section and the signal processing and alarming section. The resonance coil has a major length measured in the direction of rotation and longer than a minor length of the resonance coil in a direction perpendicular to the direction of rotation. The ratio of the minor length to the major length ranges from 0.2 to 1.0.

Abstract: An alarm device for signalling a reduction of pneumatic vehicle tire pressure comprises an oscillator 6 having an oscillation coil secured to a chassis of a vehicle; and a resonator 1 secured to the peripheral portion of a wheel having a tire adjacent to the oscillation coil and consisting of a pressure switch 4 for sensing an abnormal tire pressure change and a resonance coil and a capacitor 5 tuned to an electromagnetic wave radiated from the oscillation coil. A signal processing device contains a means for sensing a change in an oscillation condition generated in the oscillator due to a resonant condition of the resonator switched on and off in accordance with abnormal internal tire pressure and for processing a signal from the sensing means; and an alarm for generating a warning signal in accordance with the output of the signal processing device.

Abstract: An alarm device for signalling a reduction of pneumatic pressure of vehicle tires comprises an oscillator 6 having coil secured to a chassis of a vehicle, and a resonator 1 secured to the peripheral portion of a wheel having a tire adjacent to the coil and consisting of a pressure switch 4 for sensing an abnormal change of tire pressure, and a resonant coil and a capacitor 5 tuned to an electromagnetic wave radiated from the oscillation coil. A signal processing device contains means for sensing a change in an oscillation condition generated in the oscillator due to a resonant condition of the resonator switched on and off in accordance with abnormal internal tire pressure and for processing a signal from the sensing means, and an alarm for generating a warning signal in accordance with the output of the signal processing device.

Abstract: A safety pneumatic tire which can improve running distance under punctured condition comprising an annular resilient reinforcing body having a maximum thickness corresponding to 4 to 9% of the tire maximum width and a JIS hardness of at least 60.degree. in which a ratio of the tire maximum width TW to the rim width RW is 1.0.ltoreq.TW/RW.ltoreq.1.3.

Abstract: This invention is concerned with a tire pressure drop alarming apparatus for signaling an abnormal pressure drop of a pneumatic tire by transforming the pressure drop into an electric signal.The apparatus comprises a resonating circuit including a resonance coil and a resonance condenser and includes a retaining body made of metal.

Abstract: A pressure sensing switch for transducing the change of pneumatic pressure to an electrical signal comprises a diaphragm made of a material having a Young's modulus E of 1.0.times.10.sup.4 -2.1.times.10.sup.4 kg/mm.sup.2, a Poisson's ratio V of 0.3, a thickness t of 0.02-0.2mm, a diameter d measured at a radially inner edge of a side wall portion being 5-10mm, a ratio of a radius or curvature R measured at a deflectable portion to a diameter d measured at the radially inner edge of the side wall portion being 2.

Abstract: This invention is concerned with a tire pressure drop audible warning-giving apparatus, which is provided in an air chamber defined by a pneumatic tire and a wheel rim assembled with the pneumatic tire so as to strike the wheel rim for emitting an alarming sound when a tire inner pressure is dropped in the air chamber below an allowable limit. The apparatus comprises in combination: a securing member secured to the wheel rim; a blow hammer provided spacedly from the securing member in the direction perpendicular to the radial direction of the wheel rim; and a connecting member made of a resilient material and having one end connected with the radially outer end of the securing member and the other end connected with the blow hammer; wherein the blow hammer has at its radially outer end a protrusion extending radially outwardly from the radially outer end of the connecting member, and at its radially inner end a blow portion.

Abstract: A low tire pressure alarm system for pneumatic tires, wherein a radio transmitter which is adapted to produce an alarm signal of a predetermined frequency upon detection of an abnormal pressure drop is accommodated in a hollow casing for mounting on a wheel cap casing of a vehicle wheel. The alarm signal is transmitted through the hollow casing per se or through a metal coating on the hollow casing where the latter is formed from a non-conductive material. The transmitted signal is received by a receiving set which includes a receiving antenna located on the underside of the vehicle body for shielding the same from spurious or extraneous signals and a radio receiving unit mounted within a luggage compartment of signals. Upon reception of the alarm signal, the radio receiver actuates an alarming device which produces a flashing light or sound to indicate the pressure drop to an operator of the vehicle.