WO1985004435A1

WO1985004435A1 - Paving machine

Info

Publication number: WO1985004435A1
Application number: PCT/BE1985/000006
Authority: WO
Inventors: Luc Thieffry; Simone Christophe
Original assignee: Luc Thieffry; Simone Christophe
Priority date: 1984-03-23
Filing date: 1985-03-22
Publication date: 1985-10-10
Also published as: EP0179777A1; BE899230A

Abstract

Paving machine comprising a motor vehicle (1) provided with a tool holder member (4, 6), and a grip (10) for clamping a plate of paving stones (52), said grip (10) comprising support means (28, 36, 37), which are individually detachable, front (29) and rear (30) gripping elements on its base frame, second adjustment means (27, 35), enabling to adjust the mutual gap between each of the front gripping elements (29) and third adjustment means (27, 35) enabling to adjust the mutual gap between each of the rear gripping elements (30).

Description

"Paving machine"

The present invention relates to a paving machine having the features described in the preamble of claim 1.

Machines have been known for some time for clamping, transporting and laying a plate of paving stones, these machines being constituted by a motor vehicle equipped with a clamp. A general overview of the state of the art in this area is clear from an article by R. Krômer (see R. Krδmer, Bedeutung, Anforderungen und Môglich eiten rationeller Veriegung von Betonpflastersteinen, in Betonwerk + Fertigteil-Technik, volume 3/198 *, p. 167 to 175).

Paving machines conforming to the preamble of claim 1 are known, for example those placed on the market by the company Optimas, Bauelemente und Baugerâte GmbH or those having pliers manufactured by the company Ernst Probst

Greif- und Fordergerâte. The first of these machines has the major drawback of having a mechanically operated clamp. As is known, the gripping force of a mechanical clamp is a direct function of the weight of the paving stone plate to be transported. However, it is the light paving slabs that are the most difficult to transport, because they are the thinnest slabs. If the pavers are to be held together, the clamping force applied to the vertical faces of the paver plates must be greater the thinner the plate, and therefore lighter. It is the opposite that occurs when using mechanical pliers. On the other hand, neither above mentioned machines does not allow an "adjustment of the mutual spacing between each of the front and rear clamping elements. The position and the number of these are determined on the frame of the clamp, without possibility of modification, which prevents the use of a single clamp for the placement of different shapes of paving plates, which can be several thousand. If it is not possible to adapt the spacing of the clamping elements before and rear, in many cases, rows of blocks of the plate to be clamped are not subject to clamping between the front and rear sides of the plate, which can lead to a fall of the plate during its transport. as regards the means for adjusting the distance between the front and rear clamping elements provided in these machines, they do not allow the individual adjustment of the spacing between two opposite clamping elements this which again poses problems when the surfaces to be clamped are for example wavy. On the other hand, the clamp manufactured by the firm Probst is quite rudimentary as regards its guidance by the driver of the motor vehicle, and it must include guide sleeves which a worker manipulates next to the vehicle. Also known is a paving machine put on the market by the firm Hydromak Lehnen GmbH & Co. KG which includes a completely hydraulic control of the pinching elements. These are however arranged in a perfectly rigid manner on the frame of the clamp and the machine therefore almost needs a different clamp for each different form of paving stone plate.

Finally, all these paving machines are intended only for clamping, transporting and laying paving slabs and do not in any way allow their use for the other common stages of paving. In addition, the motor vehicles used are sometimes four-wheel drive vehicles not equipped with a steering system. The rear wheels of such a vehicle slip on the self as soon as the vehicle leaves a straight line. This shifting is a drawback, because it disturbs the good order of the pavers freshly laid on iesquels the vehicle must circulate and it leaves traces on it black tires.

The present invention aims to remedy the drawbacks described above, by the development of an improved paving machine, comprising a universal clamp usable for all paving slabs and a motor vehicle capable of supporting this clamp and suitable for all paving work, without having the drawbacks of skidding the rear wheels.

This problem has been solved, according to the invention, by a paving machine of the type described at the start, which has the features of the characterizing part of claim 1.

Other advantageous and improved embodiments of the paving machine according to the invention appear from claims 2 to 20.

Other details or particularities of the invention will emerge from the description given below, without implied limitation and with reference to the appended drawings.

FIG. 1 represents a schematic view in elevation, in profile, of an embodiment of a paving machine according to the invention, in a position just before the laying of a plate of paving stones on the support bed.

FIG. 2 represents a ^: elevation view, in profile, of the same paving machine, just before the removal of a plate of pavers from a package. For reasons of ease, we took advantage of this view to represent the raised position of the rear casters and the lowered position of the rear drive wheels, although this position is not used during the représen¬ ted operation.

Figure 3 shows a perspective view, on an enlarged scale, of a clamp according to the invention. Figures 8 show schematically the paving machine at different stages of paving, with its corresponding accessory.

In the various drawings, identical or analogous elements are designated by the same references. The paving machine according to the invention illustrated in FIGS. 1 and 2 comprises a motor vehicle 1 generally provided with two front drive wheels 2 and two rear drive wheels 3. This machine comprises a tool-carrying member in the form of two articulated cantilever arms 4 (of which only one is shown), integral, and controlled by jacks 5 (of which only one is also shown) so as to be able to pivot between a high position and a low position.

These cantilever arms support a fastening element 6, arranged on these arms so as to be able to pivot around a horizontal axis 7 and controlled by a jack 8. On this fastening element is provided a system of quick attachment (not shown) of work accessory.

The paving machine illustrated in Figures 1 to 3 further comprises a clamp holder 9 having a quick fixing mechanism (not shown) capable of cooperating with the fixing system of the hooking element 6. This clamp holder 9 supports a clamp 10, which, in Figure 1, clamps a plate of paving stones and transports it to the place of installation. In the illustrated embodiment, the clamp holder

9 comprises two parts, a hanging frame 11, the elements of which form approximately a pyramid with a rectangular base, which carries at its top two legs 12 (only one of which appears in the figures) between which is fixed a pin 13 with a horizontal axis. On this pin, an axis 14 is articulated, at one of its ends, so as to be able to pivot freely and its opposite end 15 is in the form of a plate. The plate 15 supports a bar 16 (see FIG. 3) which is crossed by the pivot axis 1Ψ and which has on its face oriented towards the plate 15 a corresponding plate 17, so as to allow rotation of the bar 16 around axis 14, with a minimum of friction. It is possible, for example, to provide, in a manner not shown, in the plate 15 very slight grooves every 90 ° and in the plate 17 a rib capable of cooperating with the aforesaid grooves. ”This arrangement allows to rotate by hand, effortlessly, 90 ° or 180 ° in both directions, the clamp 10 around the axis 14.

In the illustrated embodiment, the second part of the clamp holder 9 is a lifter formed by the bar 16 which carries at its ends two wings 18 (of which only one is shown), each of these wings supporting at each of its ends a chain 19. These chains are connected to the chassis of the collet 10.

In the position shown in Figure 1, the arms 4 are being lowered and the piston of the cylinder 8 is in the extended position. In this position, the projection 20 fixed on the lugs 12 of the attachment frame 11 so as to be inclined downwardly towards the axis 14 is spaced from this axis by a small distance, and the axis 14 freely suspended from the pin 13 of the legs 12 is arranged vertically by gravity. As the four chains 19 have the same length, the clamp and the paving stone plate are supported horizontally.

In the position shown in Figure 2, the piston of the cylinder 8 is in the retracted position and the attachment frame 11 is therefore slightly raised upwards. It follows that the projection 20 comes into contact with the axis 14 and causes a slight inclination of the latter relative to the vertical. The part of the clamp, which is opposite to the motor vehicle, is then brought into a slightly higher position than the part of the clamp which faces the motor vehicle.

As can be seen in Figures 1 and 2, the motor vehicle further comprises rollers 21 capable of freely pivoting about a horizontal axis 22 and freely rotating around a vertical axis 23 off-axis with respect to the 'horizontal axis. These rollers are arranged at the rear of the motor vehicle on a bracket 24. A wing of this bracket is connected to a horizontal shaft 25, supported by the chassis of the vehicle so as to be able to pivot around its axis. A cylinder 26 is. articulated, on the one hand, to the chassis of the vehicle and, on the other hand, to one end of a connecting rod 54, the other end of which is integral with the shaft 25. ^• Under the control of the jack 26, the rollers 21 are capable of pivoting between a raised position (see FIG. 2), in which the four driving wheels of the motor vehicle are in contact with the ground, and a low position (see Figure 1) in which the rear drive wheels are out of contact with the ground.

In Figure 3 is shown in more detail¬ lée the clamp used on the embodiment of paving machine illustrated. This clamp comprises a base frame formed in this embodiment of two parallel bars 27, which are kept at a constant distance between by U-shaped spacers 28 and which are suspended at their ends by the chains 19 of the lifter of the door. - pliers. On this base chassis are supported front clamping elements 29, rear clamping elements 30, and, as lateral clamping elements, clamping jaws 31 and 32.

The aforementioned U-shaped spacers 28 are arranged so as to form means for supporting the front clamping elements 29 and rear 30 on the parallel bars 27. Each of the vertical arms 33 and 34 of each U-shaped spacer 28 is provided with its free end of common fastening means, such as a clamp 35. The core 36 of each spacer is arranged so as to be able to be telescopically extendable along its axis, towards the outside, at its two ends. The extendable arms 37 of the core 36 each carry at their free end a clamping element, front or rear as the case may be.

This arrangement therefore allows individual adjustment of the spacing between two front and rear clamping elements oppo¬ ed, by axial extension of the web 36 of the U-shaped spacer 28. It also allows individual adjustment of the position of each spacer 28 on the parallel bars 27 by loosening the clamps 35, sliding the spacers along the bars 27 and tightening the clamps 35. It is therefore possible to adjust the spacing between the front clamping elements 29 as well as between the elements rear pinching 30. Finally,. this arrangement also makes it possible to remove or add easily front and rear clamping elements on the parallel bars. Thus, whatever the shape of the paver plate and the number of rows of pavers between the front and rear sides of the plate, there will be with the pliers according to the invention a front clamping element and a rear clamping element in front of each row, at an adjusted distance, which was not possible until now with the known pliers.

In the illustrated embodiment, the front clamping elements 29 are claws which are mounted at the end of an extendable arm 37 so as to be able to pivot around an axis transverse to the axis of the arm. Each of these extendable arms also supports, in an articulated manner, an individual control means, in the form of a hydraulic cylinder 38 whose piston 39 is connected in an articulated manner to the upper end of a claw 29 and can therefore rotate it between a high rest position and a low clamping position. One of these jacks 38 is connected, on the one hand, to the hydraulic system of the motor vehicle and, on the other hand, to the other jacks 38 arranged in parallel. The rear clamping elements 30 are, in the example illustrated, simple fixed stops which project downwards relative to the extendable arms 37 which support them.

It is obvious that other arrangements can be provided. For example, the spacers of the parallel bars may be independent of the means for supporting the front and rear clamping elements and these could also be envisaged in an independent form for the front clamping elements and for the rear clamping elements. One could also imagine rotary clamping claws instead of the rear stops 30.

Finally, as can be seen in FIG. 3, the front clamping elements 29 and rear 30 are equipped with a slide 61 in which a slide 60 can be fixed in height adjustable, using bolts clamping 62. A clamping plate 63 is fixed to the lower end of each slide 60 and its height position can with this arrangement be adjusted according to variations in the thickness of the blocks of the block of blocks to tighten. This clamping plate 63 is provided with orifices 64 for fixing application elements, when the shape of the edge of the paving stone plate requires it. In the illustrated case, such elements have not been shown because the longitudinal edges of the plate are planar. The parallel bars 27 support between their extremi¬ tees two pivot shafts 40 and 41, so as to allow them to pivot freely about their axis. A drive pinion 42, 43 is fixedly connected to each of these shafts. These pinions are mutually connected by a transmission chain 44. In the example illustrated, the lower strand of this chain passes directly from a pinion to the 'other. The upper strand of the chain, coming from the pinion 42 is connected to the end 45 of a piston, in the withdrawal position in FIG. 3, of a hydraulic cylinder 46, this piston being capable of projecting out of the cylinder 46 in the opposite direction to the pinion 42. The upper strand of the chain, coming from the pinion 43 is connected to the cylinder of the cylinder 46, by means of wings 48, which are arranged projecting upwards on the cylinder and between which the upper strand of the chain freely passes from the pinion 42. The jack 46 is suspended both by the flexible conduits for circulation of the hydraulic medium and by the tension to which it subjects the chain 44.

The pivoting shafts 40 and 41 fixedly support the lateral clamping jaws 31 and 32 to which can be quickly fixed, for example by bolting, application pieces 49 suitable for the shape of the short sides of the plate. blocks to be clamped and to the width of the blocks of blocks to be clamped Under the control of the actuator 46, the jaws can therefore pivot around the pivot shafts 40 and 41 between a clamping position, shown in FIG. 3, and a high, resting position, located approximately 180 ° from the previous one. , so that in the high position the jaws do not protrude relative to the overall dimensions of the clamp.

The application pieces 49 can for example be provided on their internal face with elastic elements capable of compensating for the unevenness of shape of the short sides of the block of paving stones to be clamped, in particular when the latter is of wavy shape. These pieces can also, as illustrated in Figure 3, be equipped with small pushers 50 every two rows of blocks and alternately on the left jaw and on the right. The forked end of these pushers is crossed by the axis of a ball bearing 51. This arrangement makes it possible, when the pavers are parallelepipedal, to mutually slide the rows of pavers of the paver plate 52 in the position illustrated in the figure 3, while this plate, in storage, is sometimes in a rectangular shape. This arrangement is therefore advantageous for the laying pattern with "selvedge with alternating joints" from a pack of ordinary pavers, not provided for the mechanical laying of this pattern.

The operation of the paving machine according to the invention is as follows:

As the motor vehicle 1 must travel on the pavers which have just been laid and have not yet been compacted in order to reach the place of laying, it is desirable to prevent any shifting of the rear wheels 3 of the vehicle. This operation makes it possible to prevent any deposit of rubber on the newly laid pavement, following said shifting. To do this, the driver of the vehicle controls the lowering of the rollers 21, which has the effect of raising the rear wheels of the vehicle which are then no longer in contact with the ground.

In the meantime, the clamp is adapted according to the shape of the paver plates to be clamped and the number of rows of pavers that each plate comprises. Therefore the necessary number of claws 29 and rear stops 30 is mounted on the shafts 27 with the appropriate spacing between claws and between stops as well as with the appropriate spacing between each claw and its opposite stop. Application pieces corresponding to the width of the paving slab and to the shape of its edge are bolted to the side jaws as well as possibly also to the claws and the stops, for example when the longitudinal edges of the paving slabs do not are not plan.

Finally, depending on the height of the pavers, the clamping plates

63 of the claws and of the stops are adjusted in height using the slides 60. The clamp holder 9 is then hooked to the arms 4 of the vehicle 1 and the clamp 10 is suspended from the lifter of the clamp holder 9.

As shown in FIG. 2, the vehicle is then advanced towards a pack of blocks 53 with the arms 4 raised and the piston of the jack 8 slightly retracted so that the projection 20 arranged at the top of the attachment frame 11 abuts against the axis 14 which connects this chassis to the lifter to which the collet clamp is suspended 10. As a result, the front side of the collet is slightly raised relative to the rear side. At this time, all the front claws 29 and the side jaws 31 and 32 are controlled in the raised position by means of their control means.

As can be seen from FIG. 2, the pilot can easily bring the clamp 10 in this position above a pack of pavers, while aligning the rear stops 30 opposite the rows of pavers of the paver plate 52 to be clamped . When the - rear stops

30 come into contact with the front edge of the block of blocks 53, the clamp is automatically centered relative to the width of the latter and it can thus be deposited, without any problem from this point of view, on the plate of blocks 52 above. The side jaws

31 and 32 of the clamp are then brought into the clamping position which allows perfect centering of the paving stone plate with respect to the length of the paving stone plate and brings the claws 29 and stops 30 strictly opposite their row of paving stones respective to tighten. The front claws 29 are then only brought into the clamping position. On the other hand, if, as shown in FIG. 3, the paving stone plate must have an installation pattern with "selvedges with alternating joints", the front claws 29 are first brought into the clamping position and this is only then that the lateral jaws 31 and 32, then provided with pushers 50, are brought into the clamping position and cause the rows of blocks to shift in relation to one another. This shifting can be carried out on the pack of pavers 53 itself, but it is preferable to carry it out next to the packet so that the plate of pavers subjected to the shifting does not risk entraining the lower plates of the packet. In his movement.

The pilot can then transport the plate of paving stones to the place of installation, as illustrated in FIG. 1. There, again, it is desirable to raise the lateral jaws by 180 ° beforehand, in order to facilitate installation in any conditions. of space. 'The plate once installed, the claws are raised and the operation can start again.

The motor vehicle can, thanks to its quick attachment attachment system, be used for each of the paving operations, that is to say the spreading of a bed intended to receive the paving slabs and its leveling (see figure 4), leveling the bed, moving packets of pavers (see figure 5), spreading sand to fill the joints (see figure 6), compacting the pavement in place ( see figure 7), the sweep of the finished work (see figure 8) and the loading of the cuttings. The paving machine according to the invention therefore further comprises, in particular a toothless bucket 55 for spreading the bed intended to receive the paving slabs, equalization strips (not shown) for the - leveling of the bed , a pallet puller 56 to bring the packets of pavers near the workplace, a sand spreader 57 to fill the joints of the pavement laid, a vibrating plate 58 for compacting the pavement and / or a rotary brush 59 for sweeping excess sand. These operations can be carried out by the same motor vehicle and consequently there is a great reduction of investment for the contractors, not only in the cost of the apparatuses, but also in the storage and the depreciation of those- this.

It should be understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made thereto without departing from the scope of this patent.

One can for example consider, instead of hydraulic cylinders as control elements, pneumatic or electric means. The length of the parallel bars is designed to be able to clamp plate lengths varying between 1000 and 1300 mm between the side jaws. Instead of application pieces of various shapes correspondingly adapted, as provided above, it is possible to provide extendable bars at their ends.

One can also provide that the pressure force impri¬ mated by the control elements 38 on the claws 29, to drive the latter in their clamping position, is adjustable not only by a central control of a valve not shown in the circuit motor vehicle hydraulics, but also be adjustable separately to each control element. To do this, it is provided, for example, as can be seen from FIG. 3, that each claw 29 carries an arcuate part 65 which projects upwards and at which the free end of the piston rod 66 of each cylinder 38 can be connected in an articulated manner, in several different height positions, a row of perforations 67 being provided in an arc from top to bottom of this part 65 for the connection of the piston rod 66. It is thus possible to adjust a more or less strong pressure to each claw 29 as a function of the connection point between the piston rod and its arcuate part.

Claims

CLAIMS 1. Paving machine comprising a motor vehicle (1) provided with a tool-carrying member (4,6), and a clamp (10) for clamping, transporting and laying a plate of paving stones (52), this clamp comprising a base chassis, front (29), rear (30) and lateral (31, 32 ⁾ clamping elements supported by this base chassis, first adjustment means (36, 37) making it possible to adjust the spacing between, on the one hand, the front clamping elements (29) and, on the other hand, the rear clamping elements (30) and remote control means (38, 46) capable to move at least part of the clamping elements between a rest position and a clamping position and vice versa, characterized in that the clamp (10) comprises ^{* "*} support means (28, 36, 37), individually detachable , front (29) and rear (30) pinching elements on the base frame, second adjustment means (27, 35) allowing adjustment er the mutual separation between each of the front clamping elements (29) and third adjustment means (27, 35) making it possible to adjust the mutual separation between each of the rear clamping elements (30).

2. Paving machine according to claim 1, characterized in that it comprises a selectable number of front nipping elements (29) and rear nipping elements (30), as a function of the number of rows of blocks of the block of pavers (52) to be tightened.

3. Paving machine according to claim 2, characterized in that, as first adjustment means, the clamp

(10) comprises individual adjustment means (37) for each corresponding clamping element.

4. Paving machine according to claim 3, characterized in that each support means is a support bar (36) which carries at one of its ends a front clamping element (29) or rear (30) and optionally at its at the other end, a rear (30) or front (29) clamping element, each support bar being individually detachable from the support frame.

5. Paving machine according to claim 4, characterized in that each support bar (36) is provided extensi¬ ble telescopically at its end or ends carrying a clamping element, thereby simultaneously forming one of the first adjustment means above (36, 37).

6. Paving machine according to any one of claims I to 5, characterized in that each of the front clamping elements is a claw (29) supported by its support means (28, 36, 37) so as to be able to pivot between a clamping position and a rest position, under the action of one of the control means (38) and in that each of the rear clamping elements is a stop (30) fixedly supported by its support means (28, 36, 37).

7. Paving machine according to any one of claims 1 to 5, characterized in that each of the front clamping elements (29) and rear (30) is a claw supported by its support means (28, 36, 37) so as to be able to pivot between a rest position and a clamping position, under the control of one of the control means (38).

8. Paving machine according to any one of claims 1 to 5, characterized in that it further comprises fourth adjustment means (60, 61, 62) making it possible to adjust the height of the front clamping elements and rear relative to the base chassis.

9. Paving machine according to claim 8, characterized in that each of the front clamping elements is a claw (29) supported by its support means (28, 36, 37) so as to be able to pivot between a clamping position and a rest position, in that each of the rear clamping elements is a stop (30) supported by its support means (28, 36, 37), possibly in order to be able to pivot between a clamping position and a position rest, and in that each claw and / or stop comprises, as a fourth adjustment means (60, 61, 62), a slide arrangement (61), an element capable of sliding (60) in this slide ¬ between a high position and a low position and locking means (62) of the sliding element (60) in the adjusted position depending on the thickness of the pavers.

10. Paving machine according to any one of claims 1 to 9, characterized in that, as second and third adjustment means, the base frame of the clamp (10) comprises two parallel bars (27) and fasteners

(35) each capable, in its clamping position, of fixing one of said support means (28, 36, 37) to one of the parallel bars (27) and, in its released position, of allowing this support means to be displaced (28, 36, 37) along the parallel bar (27) or even a removal of this support means out of the bar.

11. Paving machine according to any one of claims 1 to 10, characterized in that said remote control means (38, 46) are connected to the cockpit of the vehicle by hydraulic, pneumatic or electric means.

12. Paving machine according to any one of claims 1 to 11, characterized in that the base frame of the clamp (10) comprises two pivot shafts (40, 41) which each support, by way of lateral clamping element, a clamping jaw (31, 32) capable of covering at least part of one of the short sides of the block of blocks (52) to be clamped and which allow the jaw to pivot through 180 ° around an axis parallel to the surface of the paving stone plate to be clamped, between a clamping position in which the jaw is applied to the short side of the paving stone plate, and a raised position of rest, in which the clamping jaw does not exceed the overall dimensions of the base frame.

13. Paving machine according to claim 12, characterized in that said remote control means for the lateral clamping elements (31, 32) comprise a drive pinion (42, 43) fixedly arranged on each pivot shaft (40, 41), a transmission element (44) for the simultaneous rotation drive of the two pinions and a linearly extendable hydraulic, pneumatic or electric control member (46), connected to each of its ends at one end of the element of transmission (44).

14. Paving machine according to either of claims 12 and 13, characterized in that each lateral clamping jaw (31, 32) comprises an application piece (49) on the short side of the plate pavers (52) to be clamped which is easily replaceable depending on the shape of the paver plate and the width thereof.

15. Paving machine according to claim 14, characterized in that each application piece (49) is provided on its internal face with elastic elements capable of compensating for the unevenness of shape of the short sides of the plate of paving stones to be clamped.

16. Paving machine according to any one of claims 12 to 15, characterized in that each clamping jaw (31, 32) is provided with pushers (50) making it possible to mutually slide the rows of pavers to form a laying pattern called

"with selvedges with alternating joints".

17. Paving machine according to any one of claims I to 16, characterized in that the tool-carrying member (4, 6) of the motor vehicle (1) has a known mechanism for quick attachment of accessories, and in that the paving machine comprises a clamp holder (9). which is connectable to the tool-carrying member (4, 6) by the quick fixing mechanism and which supports the clamp (10) so as to allow it to pivot about an approximately vertical axis.

18. Paving machine according to claim 17, characterized in that the clamp holder (9) comprises two parts, a hanging frame (11) connected to the tool holder member (4, 6) by the mechanism of quick attachment and a suspension part (16, 19) of the clamp (10), these two parts being mutually connected so as to allow the suspension part (16, 19) to pivot around an approximately vertical axis and a pivoting of the hooking frame (11) about an approximately horizontal axis.

19. Paving machine according to either of claims 17 and 18, characterized in that the attachment frame (11) is provided with a pivoting drive means (20), capable of slightly pivoting the suspension part (16, 19) about an approximately horizontal axis.

20. Paving machine according to claim 19, characterized in that the suspension part (16, 19) is suspended from the attachment frame (1 1) by a vertical suspension axis (14) around which it can pivot, this suspension pin itself being suspended from the attachment frame (11) by a pin (13) fixedly supported between two parallel legs (12) of the attachment frame (11) and in that the frame d 'hooking (11) has at its extremi¬ ty connected with the suspension part (16, 19) a projection (20) which, in the low position of the hooking frame (11), is free and which, in the high position of the hanging frame (11), abuts against the vertical suspension axis (14) and inclines the latter upwards.

21. Paving machine according to any one of claims 1 to 20, characterized in that the motor vehicle (l) is a four-wheel drive vehicle (2, 3) which further comprises a row of at least two casters free (21), supported at the rear of the vehicle so as to be able to pivot between a raised position and a lowered position, in which the rear driving wheels (3) of the vehicle are raised so that they are no longer in contact with the ground .

22. Paving machine according to any one of claims 17 to 21, characterized in that it comprises, as paving accessory, in addition to the collet, a tool easily hookable to the tool-carrying member (4, 6 ) for each of the paving operations, such as a toothless bucket (55) for spreading the bed intended to receive the paving slabs, equalization strips for leveling the bed, a pallet holder (56) to bring the packets of pavers near the workplace, a sand spreader (57) on the pavement laid to fill the joints, a vibrating plate (58) for compacting the pavement and / or a rotary brush (54) for sweeping of excess sand.

23. Paving machine according to claim 7, characterized in that it comprises fifth adjustment means (65, 67) allowing the force imparted by the control means (38) to be individually adjusted on each of the elements pinch (29, 30) to rotate them between their rest position and their clamping position.