Patent Description:
To date, clamps of many different kinds which are removably applicable to vehicle tyres are known. These clamps are configured with a central pin to support measuring devices or targets for adjusting vehicle alignment and/or for calibrating the vehicle's sensors such as, for example, ADAS sensors. In this situation, while taking a measurement or performing calibration, the clamp is fixed securely to the vehicle wheel in such a way that the measuring device and/or the calibration target preferably occupy a central position relative to the wheel.

Prior art clamps comprise a body provided with a central portion from which a plurality of arms extend.

Normally, in clamps that are connected to the tyres, the plurality of arms comprises three arms that are angularly spaced at approximately <NUM>° from each other. Slidably mounted on each arm, there is a slider that is provided with a gripping portion configured to engage the tyre tread so that the clamp can be securely applied to the tyre.

Each slider is operatively connected, for example, by means of connecting levers, cables and the like, to a plurality of toothed elements which can be driven in rotation, for example, by means of a handle in such a way that a rotational movement of the toothed elements corresponds to a sliding movement of the sliders along the arms.

More in detail, the sliders can be moved between a closed position, where they are close to the central portion so that the gripping portions hold the tyre tightly and the clamp is applied to the tyre as one therewith, and an open position, where the sliders are away from the central portion of the clamp so that the clamp can be fitted to/removed from the tyre.

In other words, by moving the handle, the toothed elements are set in rotation and the kinematic chain they form part of causes the sliders to move as well, so that the clamp can be fitted to/removed from the tyre. Examples of these clamps are described in <CIT>, <CIT>, <CIT>, <CIT> and <CIT>.

Disadvantageously, prior art clamps are structurally complex and relatively unreliable.

In particular, the presence of kinematic chains defined by a plurality of intermeshed toothed elements not only makes the clamp difficult and complex to construct but also particularly expensive.

Moreover, after being applied to the tyre, these clamps tend to slacken (or open) and thus come away from the tyre.

More in detail, once the slider gripping portions have been tightened around the tyre, the sliders tend to slip towards the open position on account of the elastic return effect of the tyre, thus gradually losing their grip on the tyre.

To overcome this drawback, some prior art clamps, such as, for example, the clamp described in documents <CIT> (<CIT>) and <CIT>, are provided with locking devices configured to prevent the sliders from moving away from the tyre.

More in detail, the prior art locking devices are configured to operate on the toothed elements to prevent them from moving, thereby preventing the sliders from moving towards the open position.

Thus, in use, once the sliders have been moved to the closed position so that the clamp engages the tyre, the locking devices are activated to hold the sliders in position and stop the clamp from slackening.

In the case described in document <CIT>, the locking device is embodied as a lever that is movable in rotation and is provided, at one end, with a toothed wheel that is meshable with one or more of the toothed elements of the clamp and, at the other end, with an elastic return element configured to move the locking device from a working position, where it operates on the toothed elements, to a rest position, where it is clear of the toothed elements. At the working position, the locking device operates on the toothed elements in such a way as to prevent them from rotating freely, and instead, at the rest position, the locking device allows the toothed elements to turn so that the sliders can move from the closed position to the open position or vice versa.

Disadvantageously, this clamp, too, has inherent drawbacks in terms of structural complexity.

Although the locking device obviates the problem of opening or slackening the clamp, it is particularly complex because the locking device needs to interact with the toothed elements.

In effect, in use, when the locking device is activated, it interacts with one or more of the toothed elements in order to prevent the sliders from moving towards the open position.

In terms of its construction, therefore, the locking device described above is complex and expensive.

Another disadvantage is due to the structural complexity of the clamp as a whole, on account of the toothed elements. This structural complexity contributes to making the clamp particularly cumbersome and heavy.

The drawbacks of the prior art also include the fact that placing the prior art clamps, hence applying and removing them, is a particularly time-consuming operation.

The technical purpose of this invention is to overcome the above mentioned disadvantages of the prior art by providing a clamp which is applicable to a wheel tyre and a method for applying the clamp.

The aim of this invention is to provide a clamp that is easy to make and use.

A further aim of this invention is to provide a clamp that is quick and practical to fit and remove to and from the vehicle tyre.

A further aim of this invention is to provide a clamp that is simple in terms of construction.

A further aim of this invention is to provide a clamp that is robust and inexpensive.

A further aim of this invention is to provide a simple and reliable method for applying the clamp.

The technical purpose indicated and the aims specified are substantially achieved by a clamp which is applicable to a wheel tyre and a method for applying the clamp comprising the technical features described in one or more of the accompanying claims. The dependent claims correspond to possible embodiments of the invention.

More specifically, the technical purpose indicated and the aims specified are achieved by a clamp which is applicable to a wheel tyre and which comprises a body including a plurality of arms extending radially from a central axis and angularly distributed about the central axis.

According to an aspect of this disclosure, the body comprises a central portion of substantially circular shape from which the arms extend. In this situation, the central portion and the arms define a substantially star-like shape.

The arms are three in number and, in a preferred embodiment, are angularly spaced from each other by an angle different from <NUM>°.

According to an aspect of this disclosure, the clamp also comprises a supporting element - for example, a pin - extending away from the body along the central axis. This supporting element is configured to reversibly engage a measuring device, a calibration target or similar accessories useful for vehicle wheel alignment and/or for calibrating vehicle sensors. The clamp also comprises a plurality of sliders, each slidably coupled to a respective arm to move radially between a retracted position and an extracted position.

More in detail, at the retracted position, each slider is at a first distance from the central axis and at the extracted position, it is at a second distance from the central axis, greater than the first distance.

The sliders are configured to engage the vehicle tyre to allow the clamp to be firmly and securely applied to the tyre.

Each slider includes a side abutment surface configured to abut against the tyre tread so as to hold the clamp on the tyre.

The side abutment surface defines a first portion of the slider and extends perpendicularly to the plane defined by the clamp body on the side opposite the supporting element.

In a possible embodiment, the side abutment surface has a pattern on it, for example, knurling, configured to increase its grip on the tyre tread when in abutment against it.

According to a further aspect of this invention, each slider also comprises a front abutment surface configured to abut against a sidewall of the tyre when the clamp is being applied to the tyre.

The front abutment surface defines a second portion of the slider and extends in parallel with the arm on which the slider is mounted, so that when the clamp is applied to the tyre, the front abutment surface is interposed between the sidewall of the tyre and the respective arm and acts as a shim which helps prevent contact between the arm and the wheel rim.

Thus, the sliders are each defined by a first and a second portion making, between them, a right angle, which makes the slider substantially L-shaped.

According to an aspect of this disclosure, each slider also comprises an engagement portion configured to engage the arm so that the slider can slide along the respective arm.

In an embodiment, the first and the second portion are made in one piece with the engagement portion.

Alternatively, each slider comprises an auxiliary portion extending in parallel with the second portion and configured to connect the first and second portions to the engagement portion.

More in detail, the auxiliary portion is slidably movable in a cavity made in the engagement portion between a least extracted position and a most extracted position. In this situation, the clamp can also be applied to tyres larger in diameter than those which the sliders, at the extracted position, would be able to grip. In effect, the auxiliary portion can slide out of the cavity to allow the first portion to be extended beyond the end part of the arm, thereby acting as an extension of the arm.

The clamp also comprises a manoeuvring member connected to the body; the manoeuvring member constitutes an operating means which has the function to operate the radial movement of the sliders between the retracted position and the extracted position.

The clamp also comprises a plurality of connecting levers, each having a first end that is articulated to the manoeuvring member and a second end that is articulated to a corresponding slider of the plurality of sliders to allow a simultaneous movement of the sliders so that a movement of the manoeuvring member in a first direction corresponds to a movement of the sliders towards the retracted position and a movement of the manoeuvring member in a second direction, opposite to the first direction, corresponds to a movement of the sliders towards the extracted position.

In a possible embodiment (the one illustrated), the manoeuvring member is rotatably connected to the body to rotate about the central axis so that a rotation of the manoeuvring member in a first direction corresponds to a movement of the sliders towards the retracted position and a rotation of the manoeuvring member in a second direction, opposite to the first direction, corresponds to a movement of the sliders towards the extracted position. It should therefore be noted that any reference to the movement of the manoeuvring member as this disclosure continues may be understood as being a rotation according to this embodiment. Alternatively, the manoeuvring member might be movable in translation (or according to another predetermined trajectory, for example, roto-translation) so that a translation (or more generally speaking, any movement) of the manoeuvring member in a first direction corresponds to a movement of the sliders towards the retracted position and a translation (or more generally speaking, any movement) of the manoeuvring member in a second direction, opposite to the first direction, corresponds to a movement of the sliders towards the extracted position.

In a possible embodiment, the manoeuvring member is embodied as a disc with a circular cross section centred on the central axis; in this case, moving the manoeuvring member comprises rotating the disc.

Alternatively, the manoeuvring member may have any shape. For example, the manoeuvring member might be slidable (by translation) along the central axis or along an axis parallel thereto or along an axis defined by a slideway that is inclined (transverse) to the plane defined by the clamp body. In this case, the manoeuvring member is kinematically connected to the sliders by connecting levers (one connecting lever for each slider) which, by effect of the movement of the manoeuvring member towards or away from the clamp body, undergo corresponding oscillations such that their inclination to the plane defined by the clamp body varies according to the movement of the manoeuvring member (towards or away from the clamp body). For example, each connecting lever has one end that is articulated to the manoeuvring member and another end that is articulated to the respective slider, if necessary by a cam (for example, defined by a slot). That way, translating the manoeuvring member along a transverse axis (for example, the central axis), corresponds to simultaneously translating the sliders along the radial axes defined by the arms of the clamp body (thus defining a self-centring system). In another example embodiment with a slidable manoeuvring member, the connecting levers might be hinged to sliders that are pivoted to the ends of the arms of the clamp body so that translating the manoeuvring member along the transverse axis (for example, the central axis) corresponds to simultaneously rotating the sliders (defining a self-centring system) from a released position, where the first portion of each slider (with the related side abutment surface) is rotated backwards towards the user (so as not to interfere with the tyre), and a gripping position, where the first portion of each slider (with the related side abutment surface) is rotated forward towards the tyre (so as to grip the tyre tread).

The rest of this description also applies to the embodiment wherein the manoeuvring member is rotary (e.g., a disc).

The connecting levers directly engage the manoeuvring member at hinge points.

Advantageously, the absence of elements, such as ring nuts or toothed wheels, for transmitting motion from the manoeuvring member to the connecting levers makes the clamp less complex, less heavy and less expensive.

The clamp also comprises a handgrip which is connected to (integral with) the manoeuvring member and which can be gripped by a user to directly move the manoeuvring member (in the first and second directions).

The handgrip is integral with the manoeuvring member; in other words, the handgrip is fixed to the manoeuvring member (so that the handgrip has a rigid mechanical connection to the manoeuvring member). Therefore, the handgrip can be gripped by a user to move the manoeuvring member directly (in fact, a movement of the handgrip directly determines a corresponding movement of the manoeuvring member). Advantageously, the absence of elements, such as worm screws or toothed wheels, for transmitting motion from the tool operable by hand by the user and the manoeuvring member makes the clamp particularly simple, light and cheap.

According to an aspect of this disclosure, the handgrip is disposed eccentrically relative to the central axis; in other words, the handgrip is spaced from the central axis (hence, relative to the central axis, it is at a non-zero radial distance which constitutes a lever arm for a force that generates an angular momentum on the clamp body).

In an example embodiment, the handgrip is oriented along an axis perpendicular to the central axis.

In a possible example embodiment, the handgrip has the shape of a bar. Alternatively, the handgrip might have the shape of a knob or other shape which is convenient for the user to grip.

According to an aspect of this disclosure, the handgrip comprises a rod having a first end that is connected to the manoeuvring member to be integral therewith and a second end that extends radially relative to the central axis. The second end may comprise a portion that is covered with a non-slip material (rubber, for example) to make it easier for the operator to grip it.

According to another aspect of this disclosure, the handgrip is made in one piece with the manoeuvring member. More specifically, the handgrip is an extension of the manoeuvring member and is suitably contoured to allow an operator to grip it. In this situation, the handgrip has a first end that is integral with the manoeuvring member and a second end that extends radially relative to the central axis and that may, if necessary, be covered with a non-slip material (rubber, for example) to make it easier to grip.

According to an aspect of this disclosure, the clamp also comprises an additional grip connected to the clamp body and positioned in a plane containing one of the arms and the central axis.

In a possible embodiment, the additional grip is cantilevered to the clamp arm so it can be easily gripped by the user.

Advantageously, the additional handgrip makes it easier for the user to position the clamp.

In use, therefore, the user grips the additional handgrip with one hand, to orient the clamp in such a way that the arm with the additional handgrip on it is disposed vertically, and the handgrip with the other hand. In this situation, the user moves the manoeuvring member in the second direction so the sliders slide towards the extracted position.

In the case of a tyre having a particularly large diameter, that is to say, in the case where the radial distance between the sliders at the extracted position and the central axis is smaller than the radial distance between the centre of the wheel and the tyre tread, the user extracts the auxiliary portion from the engagement portion of the sliders so that the first portion of each slider extends further out from the respective arm.

Next, the side abutment surface of the slider corresponding to the vertically disposed arm can be positioned at the tyre tread by the user.

In an alternative positioning method, the user moves the clamp near the tyre so that the central axis lies in proximity to the axis of rotation of the tyre. In these situations, the clamp is moved closer to the tyre until the front abutment surfaces of each slider are in contact with the sidewall of the tyre.

The user then moves the manoeuvring member in the first direction so that the sliders move towards the tyre. In other words, the user moves the handgrip towards the second handgrip.

In a possible embodiment in which the manoeuvring member is rotatably connected to the clamp body, the handgrip describes an angle of rotation less than or, at most, equal to <NUM>° about the additional handgrip. When the sliders are at the extracted position, the handgrip is inclined by a first angle less than or equal to <NUM>° relative to the additional handgrip, and when the sliders are in contact with the tyre tread, the handgrip is inclined to the additional handgrip by a second angle which is different from (less than or, alternatively, greater than) the first angle. That means the clamp is easier for the user to use because it is more ergonomic and handier.

There are two embodiments for moving the handgrips, hence the sliders (that is, the jaws which operatively grip the tyre): in a first embodiment, the sliders are closed by moving the handgrips closer together and, in a second embodiment, the sliders are closed by moving the handgrips away from each other (in the latter case, the operator can apply more force using their body weight).

In an embodiment alternative to the above, the sliders can be brought from the extracted to the retracted position by moving the handgrip away from the additional handgrip so that the operator can more conveniently tighten the sliders around the tyre (also with the help of the weight of their body). In this situation, therefore, moving the handgrip away from the additional handgrip corresponds to sliding the sliders towards the retracted position, that is, towards the tyre, whereas moving the handgrip towards the additional handgrip corresponds to sliding the sliders towards the extracted position.

Once the sliders have been brought into contact with the tyre, the side abutment surface of each applies a gripping pressure on the tyre tread so as to hold the clamp on the wheel.

To prevent this pressure from slackening on account of the elastic return of the tyre tread or in any case to ensure a correct hold, the clamp comprises a locking device that is movable between a locked position, where it acts on the manoeuvring member to prevent it from moving in the second direction, and an unlocked position, where it allows the manoeuvring member to move in the first and second directions. According to an aspect of this disclosure, the locking device, when it is at the locked position, can allow movement in the first direction so that the user can ensure that the clamp is securely tightened on the tyre.

In a possible embodiment, the locking device comprises a braking element which, at the locked position, is configured to apply a locking pressure on the manoeuvring member by means of a vice connected to the clamp body.

Alternatively, the manoeuvring member comprises a plurality of recesses and the locking device comprises a pin that is movably associated with the clamp body to move in translation between a spaced-apart position, where the pin is distal from the manoeuvring member to create the unlocked position of the locking device, and a close-together position, where the pin is at least partly inserted in one of the recesses to create the locked position. In a mirror symmetrical embodiment, the plurality of recesses is formed in the clamp body and the pin is movably associated with the manoeuvring member.

In an embodiment, the manoeuvring member comprises an outer toothed profile and the locking device comprises a stop tooth, for example, a pawl, configured to engage with one of the teeth of the outer toothed profile when the locking device is at the locked position.

To switch the locking device from the locked to the unlocked position and vice versa, the clamp comprises an actuating mechanism connected to the locking device and operable by the user.

This mechanism may comprise levers, keys, pushbuttons and any other actuating element.

According to an aspect of this disclosure, the actuating mechanism may be made on the handgrip (or in proximity thereto) so that, when the sliders have moved into contact with the tyre, a user with a hand operatively holding the handgrip can operate the locking device to prevent the sliders from slipping towards the extracted position.

According to another aspect of this disclosure, the handgrip itself may constitute the actuating mechanism so that when the sliders have moved into contact with the tyre, the locking device can be activated by turning the handgrip about its axis, by a tilting or similar movement.

According to a further aspect of this disclosure, the actuating mechanism may be made on the additional handgrip so that, when the sliders have moved towards the retracted position, a user with a hand operatively holding the additional handgrip can operate the locking device to prevent the sliders from slipping towards the extracted position.

Alternatively, the actuating mechanism may be made on the clamp body and activated when the user lets go of the handgrip.

In use, therefore, once the sliders have moved simultaneously from the extracted position to the retracted position in contact with the tyre tread, the locking device is activated and the clamp securely grips the tyre.

Also an object of this disclosure is a method for applying a clamp to a vehicle wheel. The method comprises a step of preparing a clamp comprising a body including a plurality of arms disposed radially around a central axis and a plurality of sliders slidably coupled to the arms to move radially between a retracted position, where they are proximal to the central axis, and an extracted position, where they are distal from the central axis.

The clamp also comprises an manoeuvring member connected to the sliders by a plurality of connecting levers and to the clamp body to move in a first direction to bring the sliders towards the retracted position and in a second direction, opposite to the first direction, to bring the sliders towards the extracted position. The clamp then comprises a locking device, such as, for example, a brake, a pin, a pawl or the like, movable between a locked position, where it prevents the manoeuvring member from moving in the second direction, and an unlocked position, where it allows the manoeuvring member from moving in the first and second directions. The clamp also comprises a handgrip which is integral with the manoeuvring member and which can be gripped by a user to move the manoeuvring member.

If the manoeuvring member is rotatably connected to the clamp body (as shown in the accompanying drawings) to rotate about the central axis, the locking device, when it is at locked position, is configured to allow the manoeuvring member to rotate in the second direction and, when it is at the unlocked position, to allow the manoeuvring member to rotate in the first and second directions.

After the step of preparing, the method comprises a step of directly moving the manoeuvring member by acting on the handgrip.

In a possible embodiment, the manoeuvring member is moved translationally. Alternatively, the manoeuvring member is moved roto-translationally.

In the embodiment illustrated in the drawings accompanying this disclosure, the step of directly moving is performed by acting on the handgrip to turn the manoeuvring member in the second rotation direction to move the sliders towards the extracted position, with the locking device at the unlocked position. The method also comprises a step of moving the clamp towards the vehicle wheel so that each slider, with its side abutment surface, rests on the tyre tread and a step of driving the manoeuvring member in the first direction with the handgrip, to move the sliders simultaneously towards the retracted position.

In the step of driving it, the manoeuvring member can be moved rotationally. Alternatively, the manoeuvring member can be moved translationally or roto-translationally.

The method then comprises a step of moving the locking device from the unlocked position to the locked position to stop the sliders from unwantedly slipping towards the extracted position.

When the clamp has finished being used, the locking device is moved from the locked position to the unlocked position so as to allow moving the sliders towards the extracted position, hence slackening the clamp from the tyre.

Advantageously, the method is simple and reliable, allowing the clamp to be applied to the tyre in little time.

Further features and advantages of this invention are more apparent in the indicative, hence non-limiting, description of an embodiment of a clamp which is applicable to a vehicle wheel tyre and a method for applying a clamp to a vehicle wheel.

With reference to the accompanying drawings, the numeral <NUM> denotes a clamp which is applicable to a tyre P of a vehicle wheel.

The clamp <NUM> comprises a body <NUM> including a plurality of arms <NUM> extending radially from a central axis X and angularly distributed about the central axis X.

According to an aspect of this disclosure, the clamp body <NUM> is shaped like a plate and has a front face 10a and a rear face 10b.

In a possible embodiment, the clamp body <NUM> also comprises a central portion <NUM> which has a substantially circular cross section and from which the arms <NUM> extend to give the clamp body <NUM> a substantially star shaped structure.

In a possible embodiment, the clamp <NUM> comprises three arms <NUM> which are angularly spaced from each other by an angle of <NUM>°. Alternatively, as shown in the accompanying drawings, the angle may be different from <NUM>°.

The clamp body <NUM> also comprises a level configured to indicate the slope of the body <NUM> itself relative to a reference plane, specifically relative to a horizontal plane (at right angles to the vector of the force of gravity). The level is oriented according to a reference axis; preferably, the reference axis of the level is perpendicular to one of the arms <NUM>. It should be noted that in an example embodiment, there are three arms and one of the three is central relative to the other two (that is, between a right arm and a left arm), being angularly spaced from the right arm and from the left arm by an angle of less than <NUM> degrees (but preferably greater than <NUM> degrees). In this example, the reference axis of the level is preferably perpendicular to the central arm.

In a possible embodiment, the central portion <NUM> of the clamp body <NUM> comprises a housing that is configured to receive the level firmly and securely.

The clamp <NUM> also comprises a plurality of sliders <NUM>, each slidably coupled to a respective arm <NUM> to move radially between a retracted position, where each slider <NUM> is at a first distance from the central axis X (<FIG>), and an extracted position, where it is at a second distance from the central axis X (<FIG>), greater than the first distance.

The sliders <NUM> are steplessly slidable along the respective arm <NUM> and may adopt any position intermediate between the extracted position and the retracted position.

According to an aspect of this disclosure, each arm <NUM> comprises a groove 11a running along the direction of extension of the arm <NUM> and configured to guide the sliding movement of the respective slider <NUM> from the extracted position to the retracted position or vice versa.

To facilitate sliding each slider <NUM> along the respective groove 11a, the part of the slider <NUM> that is slidably engaged in the groove 11a is made from a low-friction material such as Teflon, for example.

As shown in the accompanying drawings, each slider <NUM> comprises an engagement portion <NUM> which slidably engages the respective arm <NUM> so as to allow the aforesaid sliding movement from the extracted position to the retracted position and vice versa.

As shown in the accompanying drawings, each slider <NUM> also includes a side abutment surface 20a configured to abut against, and apply a gripping pressure on, the tread B of the tyre P so as to hold the clamp <NUM> on the tyre P.

The side abutment surface 20a defines a first portion <NUM>' of the slider <NUM> extending perpendicularly to the plane defined by the clamp body <NUM> on the side of the rear face 10b of the clamp body <NUM> itself.

According to a further aspect of this disclosure, each slider <NUM> also comprises a front abutment surface 20b configured to abut against a sidewall of the tyre P when the clamp <NUM> is applied to the tyre P (<FIG>).

The front abutment surface 20b defines a second portion <NUM>" of the slider <NUM> and extends in parallel with the arm <NUM> on which the slider <NUM> is slidably mounted. In this situation, each slider <NUM> is substantially in the shape of an L, where the side abutment surface 20a and the front abutment surface 20b are substantially at right angles to each other.

According to an aspect of this disclosure, the side abutment surface 20a is knurled (or wavy) so it can firmly grip the tyre P, whereas the front abutment surface 20b is smooth so it can abut up against and slide on the sidewall of the tyre P.

Two possible alternative embodiments of the sliders <NUM> are shown in <FIG>.

When the clamp <NUM> is applied to the tyre P, the sliders <NUM> are first made to slide towards the extracted position to allow the clamp body <NUM> to move closer to the tyre P and then to slide in such a way that the side abutment surface 20a is in contact with the tread B of the tyre P while the front abutment surface 20b is interposed between the sidewall of the tyre P and the respective arm <NUM>. In this situation, the front abutment surface 20b acts as a spacer which disposes the clamp <NUM> in a plane parallel to the wheel so the arm <NUM> does not come into contact with the wheel rim and thus prevents scraping and scratching of the rim (<FIG>).

Scratching and other damage to the wheel rim are also avoided by the fact that the clamp <NUM> is applied to the tyre P and not directly to the wheel rim. More specifically, unlike prior art clamps, where the gripping fingers or sliders are inserted directly into the rim, the clamp <NUM> of this disclosure is configured to act with the side abutment surfaces 20a in such a way as to apply a gripping pressure with the help of the elastic deformation of the tread B of the tyre P. This aspect will become clearer as this description continues.

According to an aspect of this disclosure, each slider <NUM> also comprises an auxiliary portion <NUM> extending in parallel with the second portion <NUM>" and slidably insertable into a cavity made in the engagement portion <NUM> so the first portion <NUM>' can extend radially by a quantity greater than the extension which the groove 11a of the arm <NUM> allows the slider <NUM>.

In other words, the auxiliary portion <NUM> acts as a prolongation of the respective arm <NUM> so as to allow the side abutment surface 20a to abut against the tyre P even in the case of tyres of particularly large diameter.

In effect, in use, once the slider <NUM> has reached the extracted position and cannot slide any further along the arm <NUM>, the auxiliary portion <NUM> can be extracted from the engagement portion <NUM> so that the first portion <NUM>' protrudes radially further out from the arm <NUM> and can abut up against the tread B of the tyre P.

According to an aspect of this disclosure, the auxiliary portion <NUM> can be retracted into and extracted from the cavity in the engagement portion <NUM> to occupy a plurality of positions intermediate between a least extracted position (shown in the accompanying drawings) and a most extracted position so as to adapt the clamp <NUM> to the diameter of the tyre P it is being applied to.

For each slider <NUM>, the clamp <NUM> also comprises a stop mechanism <NUM> (shown, for example, in <FIG>) configured to stop the auxiliary portion <NUM> from sliding in the cavity once the auxiliary portion <NUM> has been extracted or retracted to adopt a desired intermediate position.

In a possible embodiment, the stop mechanism <NUM> consists of a succession of holes, made on the auxiliary portion <NUM>, into which a pin or a rod <NUM> can be inserted through a hole in the engagement portion <NUM> in such a way as to stop the auxiliary portion <NUM> at the desired intermediate position.

Alternatively, the auxiliary portion <NUM> might be stopped in the engagement portion <NUM> by means of an elastic element, a tightening element, a set screw (or the like), configured to be pressed against the auxiliary portion <NUM> to stop it at an intermediate position or to release the auxiliary portion <NUM> to allow it to slide in the engagement portion <NUM>.

In use, therefore, if the clamp <NUM> needs to be applied to a tyre P whose diameter is larger than a maximum diameter accessible to the sliders <NUM> at the extracted position, an operator extracts the auxiliary portion <NUM> of each slider <NUM> from the cavity in the engagement portion <NUM> until it reaches a desired intermediate position, that is to say, a position where the first portion <NUM>' is able to abut up against the tread B of the tyre P. In this situation, the operator activates the stop mechanism <NUM> to prevent the auxiliary portion <NUM> from unwantedly continuing to slide in or out of the engagement portion <NUM>.

More in detail, the step of extracting the auxiliary portion <NUM> of each slider <NUM> is carried out in such a way that the auxiliary portions <NUM> of the sliders <NUM> of the clamp <NUM> all protrude from the respective engagement portions <NUM> by the same amount. In this situation, once the auxiliary portions <NUM> of the sliders <NUM> have all been extracted by the same amount, the stop mechanism <NUM> of each slider <NUM> is activated to prevent the auxiliary portions <NUM> from sliding and so as to maintain the symmetry of the clamp <NUM>.

If the position of the first portions <NUM>' of the sliders <NUM> relative to the respective engagement portions <NUM> needs to be changed again, for example, in the case where the clamp <NUM> has to be mounted on a tyre P whose diameter is smaller than the preceding one but in any case larger than the diameter that can be reached by the sliders <NUM> at the extracted position, the operator releases the stop mechanism <NUM>, retracts the auxiliary <NUM> into the cavity of the engagement portion <NUM> until reaching the desired intermediate position and then activates the stop mechanism <NUM> again.

Advantageously, the possibility of extracting the first portion <NUM>', which defines the side abutment surface 20a of the slider <NUM>, relative to the engagement portion <NUM> allows applying the clamp <NUM> also to tyres P whose diameter is larger than that accessible by the sliders <NUM> at the extracted position.

The clamp <NUM> of this disclosure also comprises an manoeuvring member <NUM> that is movably connected to the clamp body <NUM>.

In the embodiment illustrated in the accompanying drawings, the manoeuvring member <NUM> is rotatably connected to the clamp body <NUM> to rotate about the central axis X.

As shown in <FIG>, the manoeuvring member <NUM> is mounted on the front face 10a of the clamp body <NUM> so that when the clamp <NUM> is applied to the tyre P, the manoeuvring member <NUM> faces towards a user of the clamp <NUM>.

More in detail, the manoeuvring member <NUM> is mounted on the central portion <NUM> of the clamp body <NUM>.

According to an aspect of this disclosure, the manoeuvring member <NUM> is made in the form of a disc, preferably a metal disc, centred on the central axis X.

Alternatively, the manoeuvring member <NUM> may be embodied in any shape.

According to an aspect of this disclosure, the clamp <NUM> also comprises a supporting element <NUM>, such as, for example, a pin or a hook, built into the clamp body <NUM> and configured to support a calibration target and/or a measuring device to perform a calibration or a variation in the alignment of a vehicle once the clamp <NUM> has been applied to the vehicle tyre P.

The supporting element <NUM> extend away from the front face 10a of the clamp body <NUM> along a direction transverse thereto, and, more specifically, it extends along the central axis X.

As shown in <FIG>, the clamp <NUM> also comprises a plurality of connecting levers <NUM>.

In a possible embodiment, the connecting levers <NUM> are made in the form of rods or links, preferably made of metal.

The connecting levers <NUM> each have a first end (not shown in the accompanying drawings) that is articulated to the manoeuvring member <NUM> and a second end 40b that is articulated to a corresponding slider <NUM> of the plurality of sliders <NUM> to allow the sliders <NUM> to move simultaneously so that a movement of the manoeuvring member <NUM> in a first direction corresponds to a movement of the sliders <NUM> towards the retracted position and a movement of the manoeuvring member <NUM> in a second direction, opposite to the first direction, corresponds to a movement of the sliders <NUM> towards the extracted position.

In other words, the connecting levers <NUM> allow the sliders <NUM> associated with them to slide simultaneously along the respective arm <NUM> so they all simultaneously occupy the same radial position relative to the central axis X.

This aspect is advantageous because it allows self-centring the clamp <NUM> while it is being applied to the tyre P.

In the embodiments shown in the accompanying drawings, the manoeuvring member <NUM> is movable in rotation about the central axis X and the first rotation direction of the manoeuvring member <NUM> corresponds to an anticlockwise direction, while the second rotation direction corresponds to a clockwise direction.

Each connecting lever <NUM> is pivoted by its first end at a hinge point made directly on the manoeuvring member <NUM>, and by its second end 40b to a respective slider <NUM> so that the latter slides along the groove 11a of the respective arm <NUM>.

Advantageously, the fact that the connecting levers <NUM> are connected directly to the manoeuvring member <NUM> without any interposed parts considerably simplifies the operation of the clamp <NUM>.

The absence of interposed parts (such as, for example, a kinematic gear chain) between the manoeuvring member <NUM> and the connecting levers <NUM> simplifies the assembly and maintenance of the clamp <NUM> and reduces its overall weight and associated costs.

To move the manoeuvring member <NUM>, the clamp <NUM> also comprises a handgrip <NUM> which is integral with the manoeuvring member <NUM> and which can be gripped by a user to move the manoeuvring member <NUM> directly, for example, in rotation about the central axis X.

In this situation, unlike prior art clamps, a movement of the handgrip <NUM> corresponds directly to a movement of the manoeuvring member <NUM> and a sliding action of the sliders <NUM> without any kinematic chain of transmission parts such as toothed wheels or gears being interposed between the handgrip <NUM> and the sliders <NUM>.

This aspect is advantageous because it makes the clamp <NUM> simple in structure, light in weight and dependable in use.

According to an aspect of this disclosure, the handgrip <NUM> is mounted eccentrically about the central axis X. This aspect is particularly advantageous because it allows the handgrip <NUM> to be held easily and conveniently by the user. In an embodiment, the handgrip <NUM> is perpendicular to, and preferably incident upon, the central axis X. Furthermore, the position of the handgrip <NUM> relative to the central axis X is such that the handgrip <NUM> does not hamper the movement of the connecting levers <NUM> and of the sliders <NUM>.

In a possible embodiment, the handgrip <NUM> is made in the form of a knob.

Alternatively, the handgrip <NUM> comprises a rod made in one piece with the manoeuvring member <NUM> and extending away from it. Looking in more detail, the rod has a first end that is integrated in the manoeuvring member <NUM> and a second end that extends radially from the central axis X. The second end might be covered with a non-slip material, such as rubber, for example, to make it easier for an operator to hold the handgrip <NUM>.

In another embodiment, the handgrip <NUM> comprises a rod that is applied to the manoeuvring member <NUM> in such a way that its first end is integral with the manoeuvring member <NUM> itself and its second end extends radially from the central axis X. The second end might be covered with a non-slip material, such as rubber, for example, to make it easier to hold the handgrip <NUM>.

Advantageously, the fact that the handgrip <NUM> comprises a rod makes it easier and more convenient to rotate the manoeuvring member <NUM>, particularly when the clamp <NUM> is being applied to the tyre P, because it acts as a lever.

More in detail, for the clamp <NUM> to be held securely on the tyre P, the manoeuvring member <NUM> continues to move (in the embodiment shown in the accompanying drawings, to rotate) in the first direction even after the sliders <NUM> have come into contact with the tyre P. In effect, in this situation, it is important that the sliders <NUM> do not simply abut up against the tyre tread B with their side abutment surfaces 20a but press hard against it so as to ensure that the clamp <NUM> has a firm grip on the tyre P.

In this situation, the fact that the handgrip <NUM> comprises a rod whose second end can be conveniently held by the operator makes it easier to continue moving the manoeuvring member <NUM> even after the side abutment surface 20a has come into contact with the tyre tread B. Thus, the operator is able to overcome easily and conveniently at least some of the elastic resistance of the tyre tread B, thereby forcing the sliders <NUM> to adhere to the tyre tread B and ensuring that the clamp <NUM> gets a firm grip on the tyre P.

In a possible embodiment, the rod is foldable. In this embodiment, the rod has a first portion which extends from the first end and a second portion which extends from the second end and which is connected to the first portion by a hinge element; that way, when the manoeuvring member <NUM> stops being rotated, the rod can be folded so it occupies less space. Alternatively, the rod is telescopic and can be extended to allow the operator to grip the handgrip <NUM> when the manoeuvring member <NUM> needs to be rotated, and retracted when the manoeuvring member <NUM> does not need to be turned.

To further facilitate placing the clamp <NUM> on the tyre P, the clamp <NUM> comprises an additional handgrip <NUM>, connected to the clamp body <NUM> and positioned in a plane containing one of the arms <NUM> and the central axis X. According to an aspect of this disclosure, the additional handgrip <NUM> is applied directly to one of the arms <NUM>.

In a possible embodiment, the additional handgrip <NUM> is cantilevered to the end of the arm <NUM> so that it juts out from the arm <NUM> and can be easily gripped by the operator.

In use, therefore, when the clamp <NUM> needs to be applied to the tyre P, the operator grips the handgrip <NUM> and the additional handgrip <NUM> to orient the clamp <NUM> so that the arm <NUM> with the additional handgrip <NUM> on it is vertical relative to the ground (<FIG>).

Next, the operator moves the manoeuvring member <NUM> in the second direction so as to move the second end 40b of each connecting lever <NUM> away from the central axis X. In this situation, the sliders <NUM> are moved simultaneously towards the extracted position so as to occupy a position that is radially spaced from the central axis X by a distance greater than that between the axis of rotation of the tyre and the tyre tread B (<FIG>).

If the sliders <NUM> at the extracted position are not spaced far enough apart to allow the clamp <NUM> to move close to the tyre P, the operator can extract the auxiliary portion <NUM> of each slider <NUM> from the respective engagement portion <NUM> so as to obtain a sort of extension of each arm <NUM>. Next, the clamp <NUM> is moved up to the tyre P so that one of the sliders <NUM> abuts against an upper portion of the tyre tread B or the central axis X lies along the axis of rotation of the tyre P and the front abutment surface 20b of each slider <NUM> is in contact with the sidewall of the tyre P.

In this situation, using the additional handgrip <NUM> to hold the clamp <NUM> in contact with the tyre P, the operator uses the handgrip <NUM> to move the manoeuvring member <NUM> in the first direction.

In the case where the manoeuvring member <NUM> is rotatably connected to the clamp body <NUM>, the handgrip <NUM> is moved progressively closer to the additional handgrip <NUM> so the second ends 40b of the connecting levers <NUM> move closer to the central axis X, thereby causing the sliders <NUM> to slide simultaneously along the respective arms <NUM> towards the retracted position (<FIG> and <FIG>).

In a preferred embodiment, the handgrip <NUM>, when it is moved in order to operate manoeuvring member <NUM>, describes an angle of rotation α (measured from the additional handgrip <NUM>) less than or equal to <NUM>°. As clearly shown in <FIG> and <FIG>, the handgrip <NUM> describes a first angle less than or equal to <NUM>° relative to the additional handgrip when the sliders <NUM> are at the extracted position, whereas, during the passage of the sliders <NUM> towards the retracted position (<FIG>), the handgrip <NUM> is moved closer to the additional handgrip <NUM> and the angle of rotation α is progressively reduced until the handgrip <NUM> and the additional handgrip <NUM> make between them a second angle smaller in size than the first angle.

This aspect is advantageous because it makes the clamp <NUM> particularly ergonomic. To move the sliders <NUM> from the extracted position to the retracted position, and vice versa, the operator only has to rotate the handgrip <NUM> by an angle smaller than <NUM>°, which means the operator does not have to exert much physical effort and makes using the clamp <NUM> easier.

The sliders <NUM> stop moving towards the retracted position when the side abutment surfaces 20a of the sliders <NUM> abut up against the tread B of the tyre P and apply pressure on it so as to securely tighten the clamp <NUM> around the tyre P.

To enable the sliders <NUM> to remain at the position reached after moving the manoeuvring member <NUM> in the first direction (that is to say, to allow the sliders <NUM> to keep their hold on the tyre P) by applying pressure on the tread B, the clamp <NUM> comprises a locking device <NUM>.

More specifically, the locking device <NUM> is movable between a locked position, where it acts on the manoeuvring member <NUM> to prevent it from moving in the second direction, and an unlocked position, where it allows the manoeuvring member <NUM> to move in the first and second directions.

In other words, when the clamp <NUM> is applied to the tyre P and the sliders <NUM> are gripping the tyre tread B, the locking device <NUM> is configured to prevent the sliders <NUM> from unwantedly slipping towards the extracted position and thus from releasing the clamp <NUM> from the tyre P.

The locking device <NUM> thus prevents the sliders <NUM> from slackening their grip on the tyre P on account of an elastic return force applied by the tyre P itself on the sliders <NUM>.

In use, therefore, once the manoeuvring member <NUM> has been moved (rotated, for example) in the first direction to bring the sliders <NUM>, specifically their side abutment surfaces 20a, into abutment against the tyre tread B, the operator moves the locking device <NUM> to the locked position to prevent the manoeuvring member <NUM> from moving in the second direction and thus stopping the sliders <NUM> from slipping towards the extracted position.

In a possible embodiment, shown in <FIG>, the locking device <NUM> comprises a braking element 50a which, at the locked position, is configured to apply a locking pressure on the manoeuvring member <NUM> by means of a vice.

The braking element 50a thus acts on the manoeuvring member <NUM> like a disc brake, where the vice holds the manoeuvring member <NUM> in place and stops it from unwantedly moving.

Alternatively, as shown in <FIG>, the locking device <NUM> comprises a stop tooth 50b, for example, a pawl, which is configured, when it is at the locked position, to stop the manoeuvring member <NUM> from moving in the second direction.

Looking in more detail, in this embodiment, the manoeuvring member <NUM> has an outer toothed profile 30a which is engaged by the stop tooth 50b to stop the manoeuvring member <NUM> from moving (in the case of the embodiment illustrated, from rotating).

In a possible embodiment, the entire outer profile 30a of the manoeuvring member <NUM> is toothed.

Alternatively, only part of the outer profile 30a of the manoeuvring member <NUM> is toothed, as shown, for example, in <FIG>.

According to an aspect of this disclosure, the locking device <NUM>, at the locked position, prevents the manoeuvring member <NUM> from moving in the second direction but allows it to move in the first direction. This aspect is advantageous because it enables the sliders <NUM> to be pressed even harder against the tyre P even if the locking device <NUM> is at the locked position, thereby ensuring that the clamp <NUM> firmly grips the tyre P. According to a further aspect of this disclosure, as shown in <FIG>, the locking device <NUM> might comprise a pin 50c operatively insertable into a hole of a plurality of holes. For example, the pin 50c is movably associated with the manoeuvring member <NUM>, whilst the holes are made in the clamp body <NUM> or in a plate that is integral therewith. The pin 50c is movable in translation between a spaced-apart position, where the pin 50c is distal from the manoeuvring member <NUM> to create the unlocked position of the locking device <NUM>, and a close-together position, where the pin 50c is at least partly inserted in a recess of a plurality of recesses made in the clamp body <NUM> to create the locked position.

Alternatively, the locking device <NUM> might comprise a pin 50c that is movably associated with the clamp body <NUM> and is insertable into recesses made in the manoeuvring member <NUM>. Alternatively, the recesses are made on a fixed auxiliary disc <NUM> interposed between the clamp body <NUM> and the manoeuvring member <NUM>. When the manoeuvring member <NUM> is locked, the pin 50c is brought to the close-together position so it is inserted into one of the recesses under it.

In a possible embodiment, the recesses are angularly distributed around the central axis X.

Alternatively, the recesses are made in a circular sector defined by the angle of rotation α described by the handgrip <NUM> to take the sliders <NUM> from the extracted position to the retracted position, and vice versa.

In use, therefore, the manoeuvring member <NUM> is moved using the handgrip <NUM> to make the sliders <NUM> slide towards the tyre tread B. Once the side abutment surfaces 20a of the sliders <NUM> are pressed against the tyre tread B, the pin 50c is actuated and moves in translation from the spaced apart position to the close-together position to be inserted into a recess under it. The position of the manoeuvring member <NUM> is thus fixed by the pin 50c, which prevents it from moving.

To switch the locking device <NUM> between the locked and the unlocked position, the clamp <NUM> comprises an actuating mechanism <NUM>, operatively connected to the locking device <NUM> and operable by the user.

In a possible embodiment, the actuating mechanism <NUM> includes a control member 80a, for example, a lever or a button or a movable knob, operable by the user with the hand that is holding the additional handgrip <NUM>.

An example is shown in <FIG>, where the braking element 50a is actuated by a lever positioned near the additional handgrip <NUM> and connected to the braking element 50a by a connecting cable.

In use, therefore, to actuate the braking element 50a, it is sufficient for the operator to operate the lever (for example, by pressing it towards the additional handgrip <NUM>) using the hand that is holding the additional handgrip <NUM> itself, thus preventing the manoeuvring member <NUM> from rotating.

With regard to the configuration where the control member 80a is in the form of a lever, there are, for example, two possible methods of actuating the lever which are opposite in their operating logic.

In a first actuating method, at its default position (at rest), the brake (like a bicycle brake) is inactive and can be applied by operating on the lever, which can then be locked at the braking position using a mechanical catch.

In a second actuating method, at its default position (at rest), the brake is locked and the lever must be operated on to enable the manoeuvring member <NUM> to be moved. The second actuating method would appear to have some practical advantages (when the correct position is reached, the user can simply let go of the brake to hold the clamp at the correct position).

In a possible embodiment, once the lever has been brought to an actuating position (that is to say, once it has been brought towards the additional handgrip <NUM>) in order to activate the braking element 50a, the lever is held at that actuating position by a mechanical catch (for example, a metal slot). In this situation, the lever keeps the braking element 50a locked on the manoeuvring member <NUM>. When the braking element 50a is released, the mechanical catch is inactivated (or disengaged) relative to the lever and the lever thus returns to a rest position (that is to say, a position distal from the additional handgrip <NUM>) so as to release the braking element 50a to allow the manoeuvring member <NUM> to move (for example, rotate) freely.

Alternatively, when the lever is at the rest position, it might keep the braking element 50a locked on the manoeuvring member <NUM>. In this situation, when the manoeuvring member <NUM> has to be set in motion, the lever is moved to the actuating position which, in this case, corresponds to a position where the lever releases the braking element 50a so as to allow the manoeuvring member <NUM> to move.

This embodiment allows improving the grip that the clamp <NUM> has when it is in position on the tyre P.

In a further possible embodiment, the actuating mechanism <NUM> can be operated manually by the operator after moving the manoeuvring member <NUM> in the first direction. In this situation, the operator holds the additional handgrip <NUM> with one hand and with the other hand, activates the actuating mechanism <NUM> using the control member 80a.

An example of this is the embodiment shown in <FIG>, where the stop tooth 50b is actuated manually by the operator placing a hand directly on a knob which is connected to the stop tooth 50b by a connecting bar and which acts as control member 80a such that moving the knob causes the stop tooth 50b to engage one of the teeth of the manoeuvring member <NUM>. Another example of this is shown in <FIG>, where the stop tooth 50b is actuated manually by the operator placing a hand on a knob which is made on the clamp body <NUM> and which acts as a control member 80a such that rotating the knob causes the stop tooth 50b to move.

Alternatively, the actuating mechanism <NUM> can be operated manually by the operator operatively holding the handgrip <NUM>.

In this situation, the operator operatively grips the handgrip <NUM> and moves the manoeuvring member <NUM> in the first direction to bring the sliders <NUM> into contact with the tyre P. Then, by continuing to hold the handgrip <NUM>, the operator can activate the actuating mechanism <NUM> to move the locking device <NUM> to the locked position.

According to a possible aspect of this disclosure, the handgrip <NUM> itself constitutes the control member 80a to activate the actuating mechanism <NUM> of the locking device <NUM>. In this situation, the handgrip <NUM> is moved (for example, rotated, lifted or lowered) in order to drive the actuating mechanism <NUM> to activate the locking device <NUM>.

Examples of embodiments where the handgrip <NUM> itself constitutes the control member 80a are shown in <FIG>, <FIG>.

In these embodiments, by way of non-limiting example, the locking device <NUM> is embodied as a pin 50c which is integral with the manoeuvring member <NUM> and movable in translation between the spaced-apart position and the close-together position (corresponding to the unlocked and locked positions) where it is extracted from or inserted into a respective recess (made on the clamp body <NUM> or on the auxiliary disc <NUM>) thanks to the command imparted to the actuating mechanism <NUM> by the operator's hand holding the handgrip <NUM>.

With reference to <FIG>, the actuating mechanism <NUM> comprises a containing body <NUM> made on the manoeuvring member <NUM> to protect the pin 50c.

The actuating mechanism <NUM> also comprises a connecting bar <NUM> extending into the containing body <NUM> radially to the central axis X and, more specifically, along a direction defined by an axis of extension A of the handgrip <NUM>.

The connecting bar <NUM> is rotatable about the axis A and one end of it is configured to engage the handgrip <NUM> in such a way that the latter rotates as one with the connecting bar <NUM>.

In this situation, rotating the handgrip <NUM> causes the connecting bar <NUM> to rotate also.

The actuating mechanism <NUM> also comprises an eccentric <NUM> (or a variable radius cam) fitted to the connecting bar <NUM> and disposed above the pin 50c. The eccentric <NUM> is configured to impart a thrust force by which the pin 50c is pushed towards the close-together position.

The actuating mechanism <NUM> also comprises an opposing spring <NUM> interposed between the eccentric <NUM> and the pin 50c and configured to cause the pin 50c to spring back to the spaced-apart position when the eccentric <NUM> stops applying the thrust force on it.

In use, therefore, the operator grips the handgrip <NUM> and moves the manoeuvring member <NUM> (for example, by rotating it about the central axis) so as to bring the sliders <NUM> into contact with the tyre tread B.

To lock the sliders <NUM> at that position, the operator, with the hand still operatively holding the handgrip <NUM>, rotates the handgrip <NUM> about its axis of extension A, thereby activating the actuating mechanism <NUM> and causing the pin 50c to pass from the spaced-apart position to the close-together position where it locks the manoeuvring member <NUM>.

Looking in more detail, rotating the handgrip <NUM> causes the connecting bar <NUM> to rotate as one therewith. In this situation, the eccentric <NUM> fitted thereon is rotated and presses the pin 50c in such a way as to cause it to move translationally from the spaced-apart position to the close-together position where it is inserted into one of the recesses to prevent unwanted movement of the manoeuvring member <NUM> which would slacken the grip of the clamp <NUM> on the tyre P.

To remove the clamp <NUM> from the tyre P, the operator rotates the handgrip <NUM> in the direction opposite to the previous direction. In this situation, the eccentric <NUM> rotates as one with the connecting bar <NUM>, thereby interrupting the thrusting action applied on the pin 50c. Thanks to the opposing spring <NUM>, the pin 50c is returned to the spaced-apart position, where it is outside the recess. In this situation, the manoeuvring member <NUM> is free to move in the second direction to cause the sliders <NUM> to slide towards the extracted position, allowing the clamp <NUM> to be removed from the tyre P.

In this embodiment, therefore, the handgrip <NUM> itself constitutes the control member 80a to activate the actuating mechanism <NUM>, hence the locking device <NUM> constituted by the pin 51c.

Another embodiment in which the handgrip <NUM> constitutes the control member 80a is shown in <FIG>.

In this embodiment, the actuating mechanism <NUM> comprises a connecting bar <NUM> extending radially to the central axis X between a first and a second end.

The first end is integral with the handgrip <NUM>, whilst the second end is operatively connected to an opposing spring <NUM> extending away from the manoeuvring member <NUM> and configured to be compressed or extended when the connecting bar <NUM> is moved.

At a hinge point C located between the first and the second end, the connecting bar <NUM> is also hinged to a support <NUM> which is integral with the manoeuvring member <NUM> and which, when the handgrip <NUM> is tilted, performs a tilting movement between a rest position, where the connecting bar <NUM> is rotated in such a way that the second end compresses the opposing spring <NUM>, and an active position, where the connecting bar <NUM> is parallel with the manoeuvring member <NUM> and does not compress the opposing spring <NUM>.

In this embodiment, the pin 50c is pivoted to the connecting bar <NUM> at a pivot point F between the hinge point C and the first end so that the tilting movement of the connecting bar <NUM> corresponds to the translational movement of the pin 50c between the close-together position and the spaced-apart position.

More specifically, when the connecting bar <NUM> is at the rest position, the pin 50c is at the spaced-apart position, whereas, when the connecting bar <NUM> is at the active position, the pin 50c is at the close-together position.

In use, therefore, the operator grips the handgrip <NUM> and tilts it so that the connecting bar <NUM> is tilted towards the rest position. In this situation, the first end of the connecting bar <NUM> compresses the opposing spring <NUM> and the pin 50c is moved to the spaced-apart position, that is to say, outside the recess so that the manoeuvring member <NUM> can be rotated in the first direction to move the sliders <NUM> into contact with the tyre tread B.

The operator keeps the handgrip <NUM> at this position for as long as the manoeuvring member <NUM> needs to be moved in the first direction.

To lock the sliders <NUM> in position after the sliders <NUM> have come into contact with the tyre tread B, the operator releases the handgrip <NUM> so the connecting bar <NUM> is tilted to the active position. In effect, in this situation, the first end of the connecting bar <NUM> is pushed by the opposing spring <NUM> and the pin 50c is moved in translation to the close-together position where it is inserted into one of the recesses to prevent unwanted movement of the manoeuvring member <NUM> which would lead to the clamp <NUM> slackening its hold on the tyre P.

Alternatively, as shown in <FIG>, to avoid the need for the operator to have to hold the connecting bar <NUM>, hence the handgrip <NUM>, at the rest position for as long as the manoeuvring member <NUM> needs to be moved in the first direction, the pin 50c is inserted fixedly into the first end of the connecting bar <NUM>, while the opposing spring <NUM> is interposed between the first end of the connecting bar <NUM> and the hinge point C.

In this embodiment, the bottom of each recesses (whether it is made on the auxiliary disc <NUM> or on the clamp body <NUM>) is provided with a magnet M which magnetically attracts the pin 50c. In this situation, unlike what is described above with regard to the embodiment of <FIG>, the connecting bar <NUM> is at the active position when it is rotated in such a way that its first end moves the pin 50c near the magnet M in the recess, whilst it is at the rest position when it is disposed in parallel with the manoeuvring member <NUM> so the pin 50c is clear of the magnet M.

In use, therefore, the operator grips the handgrip <NUM> and keeps it parallel to the manoeuvring member <NUM>, that is to say, keeping the connecting bar <NUM> at the rest position.

The operator keeps the handgrip <NUM> at this position for as long as the manoeuvring member <NUM> needs to be moved in the first direction so the sliders <NUM> are brought into contact with the tyre tread B.

To lock the sliders <NUM> at this position, the operator tilts the handgrip <NUM> so the connecting bar <NUM> is tilted to the active position. In this situation, the first end of the connecting bar <NUM> carries the pin 50c to the close-together position where it is inserted into one of the recesses. By so doing, the pin 50c is held inside the recess by the magnetic retaining action applied by the magnet M in the recess.

Advantageously, actuating the locking device <NUM> by activating the actuating mechanism <NUM> using the handgrip <NUM> directly makes fitting the clamp <NUM> to the tyre P even more simple, practical and fast.

Alternatively to the embodiments described above, where the handgrip <NUM> itself constitutes the control member 80a, the control member 80a might be made in proximity to the handgrip <NUM> so that the operator can activate it while keeping one hand on the handgrip.

Examples of embodiments where the control member 80a is made in proximity to (or on) the handgrip <NUM> so that it can be activated while the operator keeps one hand on the handgrip <NUM> are shown in <FIG>.

With reference to <FIG>, the actuating mechanism <NUM> comprises a containing body <NUM> and a connecting bar <NUM> extending into the containing body <NUM> radially to the central axis X.

The actuating mechanism <NUM> also comprises a wedge <NUM> which is mounted integrally with the connecting bar <NUM> and which is configured to press down on the pin 50c from above to cause it to move translationally towards the close-together position.

The actuating mechanism <NUM> also comprises an opposing spring <NUM> interposed between the wedge <NUM> and the pin 50c and configured to cause the pin 50c to spring back to the spaced-apart position.

The actuating mechanism <NUM> also comprises an elastic element <NUM>, for example, a spring, applied to a wall of the containing body <NUM> and configured to come into abutment against a first end of the connecting bar <NUM>.

The actuating mechanism <NUM> also comprises a release button <NUM> made on the handgrip <NUM> and operatively associated with a second end of the connecting bar <NUM>, opposite to the first end, to move the bar translationally along its axis of extension A between a rest position, where the first end of the connecting bar <NUM> compresses the elastic element <NUM> and the wedge <NUM> is beside the pin 50c so the latter is at the spaced-apart position, and an active position, where the first end of the connecting bar <NUM> is distal from the elastic element <NUM> and the wedge <NUM> is above the pin 50c so as to push down on the latter so it adopts the close-together position.

In use, therefore, the operator holds the handgrip <NUM> and keeps the release button <NUM> pressed with one finger so as to keep the connecting bar <NUM> at the rest position. In this situation, the pin 50c is at the spaced-apart position and the manoeuvring member <NUM> can be rotated in the first direction to bring the sliders <NUM> into contact with the tyre tread B.

To lock the sliders <NUM> at this position, the operator lets go of the release button <NUM> so the connecting bar <NUM> moves translationally to the active position. In this situation, the elastic element <NUM> is released and the wedge <NUM> is positioned above the pin 50c which is thus made to move translationally from the spaced-apart position to the close-together position where it is inserted into one of the recesses to prevent unwanted movement of the manoeuvring member <NUM> which would slacken the grip of the clamp <NUM> on the tyre P.

To remove the clamp <NUM> from the tyre P, the operator presses the release button <NUM> again so the connecting bar <NUM> moves translationally to the rest position. In this situation, the wedge <NUM> does not operate on the pin 50c which, thanks to the opposing spring <NUM>, is returned to the spaced-apart position, where it is outside the recess. The manoeuvring member <NUM> is thus free to move in the second direction to cause the sliders <NUM> to slide towards the extracted position, allowing the clamp <NUM> to be removed from the tyre P.

As shown in <FIG>, instead of the release button <NUM>, the actuating mechanism <NUM> might comprise a knob 87a movable translationally by the operator in such a way as to cause the connecting bar <NUM> to move translationally between the active position and the rest position. Advantageously, actuating the locking device <NUM>, such as the pin 50c, for example, by activating the handgrip <NUM> or using a control member 80a located in proximity thereto, makes fitting the clamp <NUM> to the tyre P even more simple, practical and fast.

Also an object of this invention is a method for applying a clamp <NUM> to a vehicle wheel. The method comprises a step of preparing a clamp <NUM> comprising a body <NUM> including a plurality of arms <NUM> disposed radially around a central axis X.

The clamp <NUM> also comprises a plurality of sliders <NUM> slidably coupled to the arms <NUM> to move radially between a retracted position, where they are proximal to the central axis X, and an extracted position, where they are distal from the central axis X.

In a possible embodiment, each arm <NUM> comprises a groove 11a configured to guide the sliding movement of a respective slider <NUM>.

The clamp <NUM> also comprises an manoeuvring member <NUM>, connected to the sliders <NUM> by a plurality of connecting levers <NUM> and also connected to the clamp body <NUM>.

In a possible embodiment, the manoeuvring member <NUM> is rotatably connected to the clamp body <NUM> to rotate about the central axis X. Alternatively, the manoeuvring member <NUM> is movable translationally relative to the clamp body <NUM>.

In a possible embodiment, the manoeuvring member <NUM> is embodied as a disc, while the connecting levers <NUM> are in the form of links or rods.

The manoeuvring member <NUM> is connected to the clamp body <NUM> to move in a first direction to bring the sliders <NUM> towards the retracted position and in a second direction, opposite to the first direction, to bring the sliders <NUM> towards the extracted position.

At the extracted position, the sliders <NUM> are further away from the central axis X than they are when they are at the retracted position.

The clamp <NUM> also comprises a handgrip <NUM> which is integral with the manoeuvring member <NUM> and which can be gripped by a user to move the manoeuvring member <NUM>.

More in detail, moving the manoeuvring member <NUM> using the handgrip <NUM> directly causes the sliders <NUM> to slide simultaneously along the respective arms <NUM>. In effect, the connecting levers <NUM> are hinged directly to the manoeuvring member <NUM> without interposed parts such as toothed elements, ring nuts and the like.

In a possible embodiment, the clamp <NUM> also comprises an additional handgrip <NUM> which is integral with one of the arms <NUM> and which is positioned in a plane containing one of the arms <NUM> and the central axis X. The clamp <NUM> also comprises a locking device <NUM> which is movable between a locked position, where it prevents the manoeuvring member <NUM> from moving in the second direction, and an unlocked position, where it allows the manoeuvring member <NUM> to move in the first and second directions.

In the embodiment illustrated, since the manoeuvring member <NUM> is movable in rotation about the central axis X, the locking device <NUM> is movable between a locked position, where it prevents the manoeuvring member <NUM> from rotating in the second rotation direction, and an unlocked position, where it allows the manoeuvring member <NUM> to rotate in the first and second rotation directions.

The locking device <NUM> may be made in different ways and may, for example, comprise a braking element 50a configured to apply a locking pressure on the manoeuvring member <NUM>.

Alternatively, the locking device <NUM> may comprise a stop tooth 50b configured to stop in abutment against a respective tooth of a toothed profile made on the manoeuvring member <NUM>.

Alternatively, the locking device <NUM> may comprise a pin 50c which is movable in translation to be inserted into one of the recesses made in the clamp body <NUM> and/or in an auxiliary disc <NUM> which is interposed between the clamp body <NUM> and the manoeuvring member <NUM>.

The locking device <NUM> may also comprise an actuating mechanism <NUM> configured to operate on the locking device <NUM> to move it from the unlocked to the locked position.

According to an aspect of this disclosure, the actuating mechanism <NUM> is controlled by a control member 80a which is activated manually by the user with the hand that is operatively holding the additional handgrip <NUM> connected to the clamp body <NUM>.

Alternatively, the actuating mechanism <NUM> is controlled by a control member 80a which is activated manually by the operator with the hand that is operatively holding the handgrip <NUM> or by the operator releasing the handgrip <NUM>.

Alternatively, the control member 80a and the handgrip <NUM> may be one and the same part, meaning that moving the handgrip drives the actuating mechanism <NUM> to activate the locking device <NUM>.

After the step of preparing the clamp <NUM>, the method comprises a step of directly moving the manoeuvring member <NUM>.

In a possible embodiment, the manoeuvring member <NUM> is moved translationally. Alternatively, the movement may be roto-translational.

In the embodiment illustrated, directly moving the manoeuvring member <NUM> is accomplished by rotation in the second rotation direction, by operating on the handgrip <NUM>, in order to move the sliders <NUM> towards the extracted position. In this situation, the locking device <NUM> is at the unlocked position to allow the sliders <NUM> to move along the respective arms <NUM>.

In other words, the sliders <NUM> are brought to the extracted position so their position on the arms <NUM> is at a radial distance from the central axis X which is greater than the distance between the centre of the tyre P and its tread B.

Next, the method comprises a step of moving the clamp <NUM> close to the vehicle wheel.

The clamp <NUM> is moved close to the tyre P in such a way that the arm <NUM> with the additional handgrip <NUM> on it is vertical to the ground. In this situation, the slider <NUM> corresponding to the arm <NUM> which is disposed vertically is located in proximity to the tyre tread B.

Looking in more detail, the clamp <NUM> is moved close to the tyre P so that each slider <NUM>, with its side abutment surface 20a, abuts up against a corresponding part of the tread B of the tyre P.

In an embodiment, the clamp <NUM> is moved close to the tyre P so that each slider <NUM> abuts up against a sidewall of the tyre P with a corresponding front abutment surface 20b, transverse to the side abutment surface 20a.

Advantageously, the side abutment surface 20a acts as a shim which prevents contact between the arms <NUM> and the wheel rim.

Once the clamp <NUM> has been moved up to the tyre P, the method comprises a step of actuating the manoeuvring member <NUM> in the first direction, for example in rotation, using the handgrip <NUM> in order to move the sliders <NUM> simultaneously towards the retracted position.

In the case where the manoeuvring member <NUM> is movable in rotation, the operator rotates the manoeuvring member <NUM> by moving the handgrip <NUM> close to the additional handgrip <NUM> so that the sliders <NUM> move progressively and simultaneously. By so doing, the side abutment surface 20a of each slider <NUM> comes into firm contact with the tread B of the tyre P and applies thereon a gripping pressure which allows it to hold the clamp <NUM> on the tyre P.

Advantageously, the fact that the sliders <NUM> move simultaneously along the respective arms <NUM> allows the clamp <NUM> to self-centre when it is being applied on the tyre P.

Once the sliders <NUM> have been brought into contact with the tyre tread B, to hold the sliders <NUM> in place and prevent the clamp <NUM> from slackening its hold on account of the elastic return of the tyre P, the method comprises a step of moving the locking device <NUM> from the unlocked position to the locked position. In this situation, the manoeuvring member <NUM> is unable to move in the second direction and thus the sliders <NUM> are prevented from sliding towards the extracted position and the clamp <NUM> from slackening its grip.

As mentioned above, in a possible embodiment, the manoeuvring member <NUM> comprises an at least partly toothed outer profile 30a and the locking device <NUM> comprises a stop tooth 50b. In this situation, the step of activating comprises a sub-step of moving the stop tooth 50b in which the stop tooth 50b engages with a tooth of the outer toothed profile 30a.

In another possible embodiment, the locking device <NUM> comprises a braking element 50a. In this situation, the step of activating comprises a sub-step of tightening the braking element 50a on the manoeuvring member <NUM> so that the braking element 50a applies a locking pressure.

In another possible embodiment, the manoeuvring member <NUM> (or, where applicable, the clamp body <NUM> or an auxiliary disc <NUM> interposed between the clamp body <NUM> and the manoeuvring member <NUM>) comprises a plurality of recesses and the locking device <NUM> comprises a pin that is movably associated with the clamp body <NUM> to move in translation between a spaced-apart position, where the pin is distal from the manoeuvring member <NUM> to create the unlocked position of the locking device <NUM>, and a close-together position, where the pin is at least partly inserted in one of the recesses to create the locked position.

In this situation, the step of activating comprises a sub-step of inserting the pin <NUM> translationally into a recess of the manoeuvring member <NUM>. Therefore, when the step of moving the manoeuvring member <NUM> in the first direction is over, the locking device <NUM> is activated and brought to the locked position.

According to a further aspect of this disclosure, the step of activating the locking device <NUM> also comprises a sub-step of actuating the control member 80a to activate the actuating mechanism <NUM> so that the locking device <NUM> moves from the unlocked position to the locked position.

More specifically, in this step, the control member 80a, which may be embodied, for example, as a button, a knob, a lever and the like, is actuated by the user when switching the locking device <NUM> from the unlocked position to the locked position.

According to an aspect of this disclosure, the locking device <NUM>, at the locked position, is configured to allow the manoeuvring member <NUM> to move in the first direction. In this situation, the method comprises a further step of actuating the manoeuvring member <NUM> in the first direction with the handgrip <NUM> while the locking device <NUM> is at the locked position. By so doing it is possible to ensure that the sliders <NUM> grip the tyre P with a strong enough hold.

This invention achieves the preset aims and overcomes the disadvantages of the prior art.

The clamp <NUM> is light in weight thanks to the absence of kinematic chains of toothed parts.

The clamp <NUM> is handy to use thanks to the presence of the additional handgrip <NUM>.

Claim 1:
A clamp (<NUM>) applicable to a tyre (P) of a vehicle wheel and comprising:
- a body (<NUM>) including a plurality of arms (<NUM>) extending radially from a central axis (X) and angularly distributed about the central axis (X);
- a plurality of sliders (<NUM>), each slidably coupled to a respective arm (<NUM>) to move radially between a retracted position, where it is at a first distance from the central axis (X), and an extracted position, where it is at a second distance from the central axis (X), greater than the first distance, each slider (<NUM>) including a side abutment surface (20a), configured to abut against a tread (B) of the tyre (P);
- a single manoeuvring member (<NUM>) that is movably connected to the clamp body (<NUM>);
- a plurality of connecting levers (<NUM>), each connecting lever (<NUM>) having a first end that is articulated to the manoeuvring member (<NUM>) and a second end (40b) that is articulated to a corresponding slider (<NUM>) of the plurality of sliders (<NUM>) to allow the sliders (<NUM>) to move simultaneously so that a movement of the manoeuvring member (<NUM>) in a first direction corresponds to a movement of the sliders (<NUM>) towards the retracted position and a movement of the manoeuvring member (<NUM>) in a second rotation direction, opposite to the first direction, corresponds to a movement of the sliders (<NUM>) towards the extracted position;
- a locking device (<NUM>) that is movable between a locked position, where it acts on the manoeuvring member (<NUM>) to prevent it from moving in the second rotation direction, and an unlocked position, where it allows the manoeuvring member (<NUM>) to move in the first and second rotation directions, the clamp (<NUM>) being characterized in that it comprises a single handgrip (<NUM>) which is integral with said manoeuvring member (<NUM>) and configured to be gripped by a user to move the manoeuvring member (<NUM>) directly.