Title of Invention

A DEVICE FOR SURVEYING THE RADIAL DEFORMATION STATE OF A TIRE.

Abstract The invention a device for surveying the radial deformation of a tire, said surveying being reached by means of a measure of the relative pressure of the gas inside the tire, the device comprising an envelope (12) and a threaded body (11, 11a, 11b) connected to each other, a means (26) freely and axially moving inside the envelope (12) with respect to the threaded body (11, 11a, 11b), the means (26) comprising at least a sensor, an amplifier, a transducer and an actuator, a spring (24) pushing the means (26) towards the distal end of the envelope (12) with respect to a known inflating valve of a tire, not belonging to the device. The features comprising the means (26) being enabled to perform the functions of measuring, amplifying and transducing the signal due to the difference between the pressure of the gas inside the tire and the environmental pressure, the features being further enabled for signalling the exceeding of a pre-established threshold difference value, estimating the radial deformation state of a loaded tire, said deformation being proportional to the difference between the pressure of the gas inside the tire and the environmental pressure.
Full Text BACKGROUND OF THE INVENTION
The present invention relates to a device capable of surveying the radial deformation state of a tire. Said invention relating to an industrialised embodiment resulting suitable for mass production of the device also presenting particular solutions for the employment safety of the device.
PRIOR ART
EP-A 0 893 284 of applicant discloses a surveying device comprising a sensor capable of identifying the difference between the pressure of the gas inside the tire and the environmental pressure, and of externally signalling when this difference in pressure decreases under a pre-established threshold value. This device is not used for automatic and cheap mass production and it does not present systems assuring the employment safety in any dynamic condition.
AIMS AND FEATURES OF THE INVENTION
The purpose of the invention is to remedy these defects. The invention, as claimed, solves the problem of creating a device for surveying the radial deformation condition of a tire. By using the present invention the purpose is reached consisting of measuring the radial deformation state of a loaded tire since said deformation is proportional to the difference between the pressure of the gas inside the tire and the environmental pressure.

A device for surveying the radial deformation state of a tire is described by a prior art document. This device is adapted to be mounted on a tire to indicate and to survey the interior pressure and the radial deformation state, which permits the compressed air to be charged in the tire without being removed from the tire.
The device comprises a hollow body, inflatable means disposed in the hollow body and means capable of maintaining the tire valve in a normally closed or open position. The inside of the tire is in communication with the interior of the inflatable means. Means automatically indicating the interior pressure of the tire at any given moment of time are further provided. The device is secured to the tire valve and is capable of having compressed air charged directly there through for inflating the tire. In addition, means for automatically closing the tire valve are provided, said means acting when the interior pressure of tire has dropped below a predetermined value.
Another prior art document relates to a tire pressure-warning device. This device comprises a body adapted to be screwed into the tire valve rod, a pressure sensing valve in the body, and a compression spring acting on the sensing valve to open it when the pressure in the tire is below a predetermined value. An alarm in the body is provided being adapted to produce an audible signal in response to airflow through the sensing valve. The body includes a distendable diaphragm as a pressure sensor and a compression spring for closing a switch when the air pressure is below a predetermined value. A radio transmitter in the body transmits a warning signal when the switch is closed. A monitor detects a transmitted audio or radio signal and compares it with a stored reference signal and produces an output signal only when the transmitted signal corresponds to the stored signal. A third prior art document discloses a filler and pressure indicator valve. The indicator valve presents a housing with a main valve openable upon depression by a conventional filler tool upon adding air to the tire and

automatically closeable upon release of the tire-filling tool. A shaft is slidable through the main valve and on the inner of the shaft there is a sensor valve. The sensor valve is normally closed but it responses to a low pressure condition within the tire to open, moving the shaft inwardly and releasing a pop-up cap on the end of the shaft to trigger a visual sensor element. The device can be adjusted to settings for different desired air pressure levels below which the sensor valve will be actuated.
In these and other available prior art documents first axial helical profiles are not provided resting on homologous axial helical profiles found on the base of an envelope and capable of sliding on them when a proper high screwing torque is applied to the envelope. Second side axial profiles engage homologous axial profiles found on the base of the envelope when an unscrewing torque is applied to it.
So doing, it is possible to transmit a torque in both directions between the envelope and the cylindrical member, which can axially translate inside the hollow found on the base of the threaded body and of the envelope against the force of the spring.
Neither cylindrical surfaces delimiting a zone having an internal diameter shorter than the one of the internal cylinder of a sleeve are provided in the available prior art documents as well as the protuberances having an axial extension limited according to the stroke available for the group sensor/amplifier/transducer/actuator/ inside the chamber in order to allow the disengaging of the protuberances from an open elastic ring when said group is in contact with the wall.

A second purpose of the invention is to signal to the external when the difference between the pressure of the gas inside the tire and the environmental pressure decreases under a pre-established threshold value. A further aim is to supply the device with apparatuses assuring the employment safety in every dynamic condition.
BRIEF DESCRIPTION OF THE DRAWINGS
Other advantages, features and aims of the invention, may be more readily understood by referring to the accompanying drawings, which concern preferred embodiments, in which: Z Fig. 1 shows an axial section of a device according to the present invention
in loading condition; Z Fig. 2 represents an axial section of a device according to the present
invention in unloading condition; Z Fig. 3 is a perspective view of some internal members of the device; Z Fig. 4 is a sectional view of an internal member of the device; Z Fig. 5 is a perspective of some internal members of the device; Z Fig. 6 is a sectional view of some internal members of the device;
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Fig. 1 shows the device (1) mounted on an usual inflating valve for tires. The valve consists of a metal tube (2) containing a body (3) the internal of which is fixed by means of a sealed threaded connection (4) in which a self-closing closure member (5) axially slides with a sealing gasket (6) maintained in closing position by a spring (7). The closure member (5) is capable of automatically

opening when the pressure in the chamber (8) connected to the atmosphere, multiplied by the effective surface of the sealing gasket (6), generates on the closure member (5) an axial downwards force higher than the force due to the pressure in the chamber (9) connected to the tire, multiplied by the efficient surface of the sealing gasket (6) plus the force of the spring (7). Vice-versa, the closure member (5) remains closed when the force due to the pressure in the chamber (8) is lower than the force due to the pressure inside the tire (chamber (9)) plus the force of the spring (7). Of course, the closure member (5) can also be opened from the outside by a mechanical action of a force acting on its end and turned towards the inside, as represented in Fig. 1. The device (1) is screwed on the valve instead of the usual protection cap. The device (1) and most of its internal components have an axial symmetrical shape. The device (1) comprises a threaded body (11) consisting of two welded parts (11a and lib). The body (11) engages a threaded end (10) of the tire valve. An external envelope (12) is connected to the body (11) through an unscrewing free wheel mechanism, surveying the maximum torque applied to the device (1) and generating an axial pushing. The unscrewing mechanisms act also as anti-sabotage and anti-theft apparatuses. Said devices form an unidirectional free wheel mechanism, allowing the transmission of a torque between the envelope (12) and the threaded body (11) in the screwing direction only. So doing, when the closure of the whole device is completed, and a sufficient clamping torque (capable of contrasting an unscrewing torque) is assured and controlled through proper apparatuses, it is impossible to unscrew the device from the valve, since the unscrewing torque applied to the envelope (12) cannot be transmitted to the threaded body (11).

The clamping is necessary to avoid the device can be unscrewed and lost during the movement of the vehicle because of the external forces and vibrations and, moreover, it is necessary to assure the efficiency of the functions to be carried out by the device.
According to a preferred embodiment as shown in Fig. 3, front teeth (13), that is parallel to the axis of the device, obtained on the external circumference of the threaded body (11), engage homologous axial front teeth (14) obtained on a cylindrical member (15) to be coaxially mounted to the body (11) and capable of a so downwards axially sliding with respect to the body (11) with a sufficient quantity to disengage the homologous teeth, while a spring (16) causes a soft pushing upwards on the cylindrical member (15) tending to maintain the teeth (13,14) in mutual contact.
The cylindrical member (15) is fitted with radial protuberances (17) producing on a side axial helical profiles (18) resting on homologous axial helical profiles (19), as shown in Fig. 4. The profiles (19) are on the base of the envelope (12) and capable of sliding on them when a properly high screwing torque is applied to the envelope (12). On the other side, axial profiles (20) are provided, engaging homologous axial profiles (21) on the base of the envelope (12), when an unscrewing torque is applied to the envelope (12).
So doing, it is possible to transmit a torque in both directions between the envelope (12) and the cylindrical member (15), which can axially translate inside the hollow (22) on the base of the body (11) and of the envelope (12) against the force of the spring (16).

A screwing torque applied on the envelope (12) is transmitted to the cylindrical member (15), the axial teeth (14) of which engage the homologous axial teeth (13) of the threaded body (11). So doing, the screwing torque is transmitted to the body (11) screwing up to the whole clamping on the end (10) of the tire valve.
The clamping of the device on the valve is correctly completed when the clamping is achieved by a not excessive, sufficient and proper final torque. Both in case of manual screwing of the device on the end of the tire valve and, above all, in case of using of tools or ancillary apparatuses for applying a higher clamping torque, the risk is to apply a too much high torque, which can damage the device and/or a sealing gasket (23) located between the threaded body (11) and the end (10) of the valve.
An insufficient clamping torque can result dangerous, since it cancels the efficiency of the sealing gasket (23 until causing the unexpected unscrewing of the device because of the vibrations due to the running of the vehicle. The device is used for assuring the efficient and full clamping of the threaded members (11,10) and of the gasket (23), even in case of using by an unskilled person without adequate tools (and, therefore, unable to verify if the applied screwing torque is sufficient for the purpose).
An embodiment can be suggested which assures the full and efficient clamping of the threaded body (11) on the tire valve, and, therefore, capable of advising the driver when the screwing torque is achieved a proper and sufficient value for the purpose. The embodiment avoids an excessive clamping by the application of screwing torques having value higher than the proper and sufficient value for the purpose.

In order to obtain the above mentioned embodiment, it is suggested, for example, to apply a screwing torque limiting device acting on the external envelope (12) of the threaded body (11) through the free wheel mechanism. The torque limiting device is obtained by the coupling of the axial helical profiles (18) with the homologous axial helical profiles (19), capable of sliding on the profiles (18) when a sufficiently high screwing torque is applied to the envelope (12) capable of generating a component of axial pushing P on the envelope (12) (Fig. 2). The pushing P is higher than the upwards pushing due to a spring (24). The spring (24) is located between the threaded body (11) and a centring sleeve (25) by means of which the spring (24) pushes upwards the sensor/amplifier/transducer/actuator group (26) which, before the screwing clamping manoeuvre of the device (1) on the tire valve, is unloaded. Therefore, the group (26) rests on the upper wall (27) at the end opposite to the threaded body (11), the wall (27) being rigidly fixed to the envelope (12). The sealing is obtained by means of a gasket (28) located between the end of the envelope (12) and an abutting end on the wall (27).
When the screwing torque applied to the envelope (12) is sufficiently high to generate on the envelope (12) the component of axial pushing P having a value higher than the upwards pushing of the spring (24), any further increasing of the applied torque causes a helical movement of the envelope (12) which slides towards the valve (2) and, at the same time, causes a pushing from the wall (27) to the sensor/amplifier/transducer/actuator group (26). The group (26) presses the spring (24).

The pushing of the wall (27) causes the translation of the group (26) until the limit end on the upper wall (29) of the threaded body (11). During the descent of the envelope (12) the lower end (30) of the housing (31) of the group (26) pushes the closure member (5) towards the inside of the valve (2) against the forces of the spring (7) and of the tire gas pressure on the efficient section of the gasket (6), and connects the chamber (9) to the chamber (8) delimited by the end (10) of the valve (2), the upper wall (29) of the threaded body (11), the gasket (23) and by a gasket (32) obtaining the sealing between the lower end (30) of the housing (31) of the group (26) and the cylindrical hollow (33) of the upper wall (29) of the threaded body (11).
The gasket (6) is open until the group (26) is displaced towards the threaded body (11), while it automatically closes when the group (26) is far from the threaded body (11).
The group (26) contains apparatuses suitable for the measuring, amplifying and transducing the signal/due to the difference between the tire gas pressure and the environmental pressure, and for signalling the exceeding of the pre-established threshold. These apparatuses are technically equivalent to the ones described in EP-A 0 893 284, therefore, in order to better understand said apparatuses please read this text.
An annular gasket (35) separates the chamber (36), located between the wall (27) and the group (26), from the chamber (37) located between the centring sleeve (25) and the environment. The chamber (37) is connected to the environment through a not shown hole at the basis of the threaded body (11). This gasket (35) co-operates with the spring (24) in order to realise the same function of the bellows of EP-A 0 893 284.

The screwing torque applied on the envelope (12) causes the screwing and the clamping of the device (1) on the threaded end (10) of the valve (2). Then the torque causes the helical movement of the envelope (12), the wall (27) of which pushes the nearest part of the group (26) in order to reach the loading of the device according to EP-A 0 893 284.
The unscrewing of the device (1) acting on the envelope (12) is prevented by the free wheel mechanism if the threaded body (11) was closed during the screwing causing a clamping torque higher than the unscrewing torque which is very low but it exists. In order to assure a higher clamping torque, in addition to the usual friction between the two parts, which are fixed through the threading when both ends are in abutting end, further apparatuses can be used, as for example:
Self-closing technologies of the threaded body (11) on the male thread (10), as for a partial deformation of the female thread of the threaded body (11) or the interposition, at the upper end of the threaded body (11), of a deformable component capable of causing a strong friction torque on the threading (10), as used for self-closing nuts (See Filippi, Disegno di Macchine, Vol. II, Hoepli for some known examples, neither limiting nor exhaustive);
Further components allowing a strong friction and an high clamping torque between the two parts (11, 10) fixed together, as for example elastic washers like UNI 1751 and 1752 or DIN 128, corrugated or knurled elastic washers, plane or conical elastic washers with teeth according to UNI 3703, 3704, 3705, 3706, etc (See Filippi), which can be applied at the end stop of the male thread (10) in order to avoid any damage to the male thread.

The elastic washer (34) located between the end (10) of the valve (2) and the upper wall (29) of the threaded body (11) carries out the same function. The external contour of the envelope (12) in the clamping zone for the torque (either manually or by using proper tools or manoeuvring keys) has a cylindrical shape or shapes more suitable for a better clamping and a better transmission of the torque, as for example knurling, grooved or polygonal contours. The wall (27) is made of transparent material, but its internal contour is shaped by concentric nuts (38) having geometrical features, with respect to the index of refraction of the used material, cause from an external view a neutral colouring when the group (26) is far from the wall (27) (Fig. 1), and vice versa a bright colouring according to the tonality of a component (39), shaped with concentric protuberances (40) capable of being introduced with precision inside the nuts (38) of the inner part of the wall (27), when the group (26) is found in condition of Fig. 2. So doing, the position of the group (26) is signalled to the external part since the neutral colouring shows the loaded device (1), whereas the bright colouring shows the unloaded device according to EP-A 0 893 284. The sleeve (25) supports the group (26), to which it transmits the pushing of the spring (24). An apparatus is provided suitable to prevent the translation of the group (26) from the unloading condition of Fig. 2 in which it is fixed to the wall (27) towards the upper wall (29) of the threaded body (11) because of the centrifugal force due to the rotation of the wheel. The force acts on the group (26) and on the envelope (12).
The apparatus is better shown in Figs 5, 6. The sleeve (25) of Fig 5 presents radial protuberances (42) towards the inside, the cylindrical surfaces (46) of which delimit a zone having an internal diameter shorter than the diameter of the internal cylinder of the sleeve (25). The protuberances (42) have an axial

extension limited according to the stroke available for the group (26) inside the chamber (36), in order to allow the disengaging of the protuberances from an open elastic ring (41) when the group (26) is in contact with the wall (27). The elastic ring (41) is found inside a groove (43) being in the upper part of the threaded body (11b) shaped in order to prevent the axial coming out of the ring (41). Radial recesses (44) are found in the threaded body (11b), said recesses capable of housing the radial protuberances (42) of the sleeve (25) when the group (26) translates towards the upper wall (29) of the threaded body (11).
When the translation of the group (26) towards the upper wall (29) of the threaded body (11) begins, the lower end (45) of each radial protuberance (42) intercepts the ring (41) which, in its rest condition, has an external diameter longer than the diameter of the cylindrical surfaces (46). In order to continue the translation, it is necessary an additional axial stress on the sleeve (25) in addition to the pushing which exceeds the pushing of the spring (24), said stress being capable of overcoming the elastic resistance of the ring (41) for causing the decreasing of the diameter up to allow the passage of the protuberances (42).
If the action of the centrifugal force on the group (26) and on the envelope (12) is lower than the additional stress the translation of the group (26) is stopped. The elastic reaction of the ring (41) and the shaping of the radial protuberances (42), in particular of their lower ends (45), are so planed to cause the stopping of the translation of the group (26) and the envelope (12) due to the action of the centrifugal forces also very intense according to the vehicle speed.

A stopping of the descent of the envelope (12) in case of a translation without helical movement, as in case of action due to the centrifugal force only, is then realised by means of further radial protuberances found on the external contour of the cylindrical member (15) extending at the basis the protuberances (17), as shown in Fig 3, by means of peripheral contours (46). In the envelope (12) radial protuberances (47) towards inside are found (Fig 4), which interfere with the peripheral contours (46) in case of translation of the envelope (12) without helical movement, for example because of the centrifugal force, as shown in Fig 7.
The centrifugal force, due to the rotation of the wheel, presents a component aca pushing the device together with all its components towards the inside of the wheel. The push tends to cause the translation of the components moving with respect to the envelope (12), including the group (26) and the closure member (5).

WE CLAIM:
1. A device for surveying the radial deformation of a tire, said surveying being reached by means of a measure of the relative pressure of the gas inside the tire, the device comprising an envelope (12) and a threaded body (11, 11a, 11b) connected to each other,
a means (26) freely and axially moving inside the envelope (12) with respect to the threaded body (11,11a, 11b),
the means (26) comprising at least a sensor, an amplifier, a transducer and an actuator,
a spring (24) pushing the means (26) towards the distal end of the envelope (12) with respect to a known inflating valve of a tire, not belonging to the device, characterized in that:
the features comprising the means (26) being enabled to perform the functions of measuring, amplifying and transducing the signal due to the difference between the pressure of the gas inside the tire and the environmental pressure, the features being further enabled for signalling the exceeding of a pre-established threshold difference value, estimating the radial deformation state of a loaded tire, said deformation being proportional to the difference between the pressure of the gas inside the tire and the environmental pressure.

2. A device as claimed in claim 1, wherein, for outside signalling the radial
deformation state of the tire, the group (26) is found in a first distal position where
the means (26) is in contact with a wall (27), and in a second proximal position
where the means (26) is far from the wall (27),
the wall (27) is made of transparent material, and its internal contour is shaped by concentric nuts diggings (38),
the geometrical features of the nuts diggings (38), according to the refractive index of the transparent material of the wall (27), produce, from an external view, a neutral colouring when the means (26) is far from the wall (27), and
vice-versa a bright colouring is obtained, according to the tonality of a component (39), when the means (26) is in contact with the wall (27),
the component is a part of the means (26),
said means (26) being shaped with concentric protuberances (40) capable of introducing with precision inside the nuts diggings (38) of the inner part of the wall (27) when the means (26) is in contact with the wall (27).
3. A device as claimed in claim 1, wherein, for outside signalling the radial
deformation state of the tire, the means (26) reaches the first distal position
because of the pushing of the spring (24), and the second proximal position by
means of the action of a force acting against the pushing of the spring (24).

4. A device as claimed in claim 3, wherein a torque applied to the envelope (12) causes a helical movement of the envelope (12) which slides towards the valve (2), and, at the same time, causes a pushing from the wall (27) to the means (26) which, in its turn, presses the spring (24).
5. A device as claimed in claims 3 and 4, wherein a screw mechanism is provided causing the helical movement, and, therefore, the translation of the external envelope (12) with respect to the valve (2) and the threaded body (11, 11a, 11b) in direction of the valve (2),
in addition, said screw mechanism causes the displacement of the means (26) until the abutting with the threaded body (11, 11a, 11b) in direction of the valve (2), that is towards the proximal position, and the opening of the self-closing member (5) of the valve (2) due to the pushing of the end (30) of the housing (31) of the means (26).
6. A device as claimed in one of the previous claims, wherein the screw
mechanism consists of first radial protuberances (17) obtained on a cylindrical
member (15), the cylindrical member (15) being coaxial to the threaded body (11,
11a, 11b),
helical contours (18) being obtained on the first radial protuberances (17), the contours (18) resting on homologous axial helical contours (19), integral with the envelope (12).

7. A device as claimed in one of the previous claims, wherein front teeth (13),
that is parallel to the axis of the device, obtained on the on the external circumference of the threaded body (11), engage homologous axial front teeth (14) obtained on the cylindrical member (15),
the cylindrical member (15) being coaxial to the threaded body (11),
the cylindrical member (15) being capable of axially downwards sliding with respect to the threaded body (11), moving away from the external circumference and from the front teeth (13) of a quantity sufficient to disengage the homologous teeth (13,14), while a spring (16) causes a soft pushing upwards on the cylindrical member (15) tending to maintain the teeth (13,14) in contact.
8. A device as claimed in claim 1, wherein a gasket (23) closes the connection
between a chamber (8), communicating with the tire, when the device is in the
second proximal position of the means (26), and the atmosphere when the
threaded body (11,11a, 11b) is clamped on the valve (2),
to tighten the gasket (23) by means of the threaded body (11, 11a, 11b) threaded body is screwed until abutting on the external thread (10) of the valve (2) the gasket having the purpose of assuring safety conditions.
9. A device as claimed in claim 1, wherein, in order to assure the safety in all
dynamic conditions, second radial protuberances (47) are further provided, said
protuberances (47) being turned towards the internal part of the tire,

the second radial protuberances (47) interfering with peripheral contours (46) integral with the threaded body (11, 11a, 11b) for preventing the axial translation of the envelope (12) causing the opening of the self-closing member (5) of the valve (2) in absence of helical movement; said translation is due to an external centrifugal force generated by the rotation of the wheel.
10. A device as claimed in claim 8, wherein, to assure the right clamping of the gasket (23), the geometrical features of the screw mechanism prevent the relative sliding of the homologous axial helical contours (18, 19), until the clamping torque of the gasket (23) applied to the envelope (12) reaches a pre-established threshold.
11. A device as claimed in claim 8, wherein the value of the threshold of the clamping torque of the gasket (23) depends on the pushing of the spring (24) moving the means (26) towards the first distal position, since the means (26) rests on the wall (27) of the envelope (12),
the relative sliding of the homologous axial helical contours (18, 19) occurring when the threshold of the clamping torque has been exceeded.
12. A device as claimed in claim 1, wherein the spring (24) works together with
the resisting screwing couple of the threaded body (11a) on the threaded end (10)
of the inflating valve of the tire and with the resisting couple die to the axial
compression of the gasket (23),

said resisting couple contrast the geometry of the screw mechanism, and in particular the inclination of the axial helical contours (18, 19), for reaching a right value of threshold of the clamping couple of the gasket (23) and for preventing the clamping couple from being insufficient, so that the gasket (23) does not seal, or from being excessive, so that the gasket (23) is damaged.
13. A device as claimed in claim 1, wherein an elastic ring (41), a sleeve (25), and radial recesses (44) are further provided,
the elastic ring (41) being housed by a groove (43) obtained on the threaded body (11, 11a, 11b), the groove (43) being shaped in order to prevent the axial coming out of the ring (41),
the sleeve (25) being located between the spring (25) and the means (26), the sleeve (25) presenting third radial protuberances (42) towards the inside of the tire, the cylindrical surfaces (46) of the third radial protuberances (42) delimit a zone having an internal diameter shorter than the one of the internal cylinder of the sleeve (25), and
the radial recesses (44) being capable of housing the third radial protuberances (42) of the sleeve (25) when the means (26) slides towards proximal position, the third radial protuberances (42) having an axial extension limited according to the stroke available for the means (26) in order to allow the disengaging of the protuberances (42) from the elastic ring (41) when the means (26) is found in the distal position, for hindering the displacement of the means (26) towards the

second proximal position and the opening of the self-closing member (5) of the valve (2) due to the action of the axial component of the centrifugal force, since the lower end (45) of each radial protuberance (42) intercepts the ring (41) that, in its rest condition, has an external diameter longer than the one of the cylindrical surfaces (46),
in order to continue the translation it is necessary an additional axial pushing on the sleeve (25) with respect to the one which exceeds the pushing of the spring (24), said pushing being capable of overcoming the elastic resistance of the ring (41) and causing the decreasing of the diameter up to allow the passage of the protuberances (42), the obtained additional axial pushing acting on the sleeve (25) exceeding the action of the axial component of the centrifugal force on the means (26) and on the envelope (12).

The invention a device for surveying the radial deformation of a tire, said surveying being reached by means of a measure of the relative pressure of the gas inside the tire, the device comprising an envelope (12) and a threaded body (11, 11a, 11b) connected to each other, a means (26) freely and axially moving inside the envelope (12) with respect to the threaded body (11, 11a, 11b), the means (26) comprising at least a sensor, an amplifier, a transducer and an actuator, a spring (24) pushing the means (26) towards the distal end of the envelope (12) with respect to a known inflating valve of a tire, not belonging to the device. The features comprising the means (26) being enabled to perform the functions of measuring, amplifying and transducing the signal due to the difference between the pressure of the gas inside the tire and the environmental pressure, the features being further enabled for signalling the exceeding of a pre-established threshold difference value, estimating the radial deformation state of a loaded tire, said deformation being proportional to the difference between the pressure of the gas inside the tire and the environmental pressure.

Documents:

583-kol-2003-granted-abstract.pdf

583-kol-2003-granted-claims.pdf

583-kol-2003-granted-correspondence.pdf

583-kol-2003-granted-description (complete).pdf

583-kol-2003-granted-drawings.pdf

583-kol-2003-granted-examination report.pdf

583-kol-2003-granted-form 1.pdf

583-kol-2003-granted-form 13.pdf

583-kol-2003-granted-form 18.pdf

583-kol-2003-granted-form 2.pdf

583-kol-2003-granted-form 26.pdf

583-kol-2003-granted-form 3.pdf

583-kol-2003-granted-form 5.pdf

583-kol-2003-granted-priority document.pdf

583-kol-2003-granted-reply to examination report.pdf

583-kol-2003-granted-specification.pdf


Patent Number 239971
Indian Patent Application Number 583/KOL/2003
PG Journal Number 16/2010
Publication Date 16-Apr-2010
Grant Date 16-Apr-2010
Date of Filing 11-Nov-2003
Name of Patentee BARBANTI GIOVANNI
Applicant Address VIA PODGORA 1, I 40033 CASALECCHIO DI RENO
Inventors:
# Inventor's Name Inventor's Address
1 BARBANTI GLOVANNI VIA PODGORA 1, I 40033 CASALECCHIO DI RENO
PCT International Classification Number B60C23/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA