GB1589844A

GB1589844A - Conveyor belt drum

Info

Publication number: GB1589844A
Application number: GB3872377A
Authority: GB
Original assignee: Steller Co KG Fritz GmbH
Current assignee: Steller Co KG Fritz GmbH
Priority date: 1977-09-16
Filing date: 1977-09-16
Publication date: 1981-05-20

Description

(54) CONVEYOR BELT DRUM (71) We, FRITZ STELLER GmbH Co.

K.G., of Wittener Strasse 73c, 5600 Wuppertal 2, Federal Republic of Germany, a Kommanditgesellschaft organised under the laws of the Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent by be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a conveyor belt drum of the kind comprising a peripheral wall surrounding two end members through both of which a shaft or axle passes and which are secured to the said shaft or axle, each end member of the drum being frictionally connected to the peripheral wall of the drum exclusively by means of at least one rubber-elastic insert element which is clamped between the outer peripheral surface of the end member and the inner surface of the peripheral wall of the drum.A conveyor belt drum of the foregoing kind is described in West German Published Specification 1,804,044. The advantage of the known conveyor belt drum consists in that the merely frictional connection made between the end members of the drum and the peripheral wall of the latter by means of the rubberelastic insert elements permits compensation for movement. This compensation for movement takes into account the deflection under load of the drive shaft of a driving conveyor belt drum and also the deflection under load of the axle of a non-driven guide conveyor belt drum, while the peripheral surface of the drum is itself relatively rigid in respect of shape. Despite its fundamental advantages the known conveyor belt drum is found disadvantageous because the insertion of the end members is very difficult.With the known conveyor belt drum the rubber-elastic elements are in fact inserted along an annular inserting device provided with an external or internal cone. In one embodiment the end member of the drum is pressed along the inner cone into the peripheral wall of the drum together with the insert element surrounding it on its outer periphery. In another embodiment the annular insert element is held approximately in its final insertion position on the outer end face with the aid of an additional device, while the end member of the drum together with the inserting device which precedes it, and which is provided with an external cone, is pressed into its inserted position from the interior of the drum.

In the case of the known conveyor belt drum the insertion operation described above requires expensive hydraulic clamping devices, while during the insertion operation the peripheral wall of the drum must be so secured as to be axially immovable. The replacement of drum walls in large belt conveyor systems, which is required because of wear, can therefore normally be effected only in the workshop, but not on the site, for example in underground mines.

Moreover, the known conveyor belt drum is disadvantageous becuase it does not permit readjustment of the insert elements, although this is desirable after a certain amount of wear, particularly wear caused by ageing. From another object of a rather different kind, namely a conveyor belt roller not transmitting driving torques, it is known (German Democratic Republic Patent Specification 8430) for an annular elastic intermediate member to be clamped by means of clamp screws on the outer periphery of a double roller end member which opens conically in the direction of the outer periphery, the clamp screws passing axially through the double end member.This arrangement has the fundamental disadvantage that the clamping of the elastic intermediate member through the axial compression of the double end member of the roller is possible only because the elastic intermediate member is deformed quasi-hydraulically. By this quasihydraulic deformation, however, the elastic material is squeezed radially outwards by transverse forces acting axially, which is detrimental to the elastic material. However, even if it were desired to tolerate this disadvantage, the double end member of the roller according to the last-mentioned Patent could scarcely be utilised in a conveyor belt drum either from the economic or from the constructional point of view.

It should also be mentioned that the elastic insert element of the known conveyor belt drum of the kind first described above is subjected to considerably shearing loads over a vcry long distance while the end member of the drum is being pressed in.

The disadvantages of known arrangements having been realised, and taking as starting point the object of the West German Published Specification 1,804,044, the invention is based on the problem of providing a conveyor belt drum in which the end members can be installed and removed comparatively simply and moreover permit readjust mcnt of the rubber-elastic insert elements.

Accordingly, the present invention consists in a conveyor belt drum, comprising a peripheral wall surrounding two end memhers through both of which a shaft or axle passes and which are secured to the said shaft or axle, each end member of the drum being frictionally connected to the peripheral wall of the drum exclusively by means of at least one rubber-elastic insert element which is clamped between the outer peripheral surface of the end member and the inner surface of the peripheral wall of the drum, characterised in that between the outer peripheral surface of each said end member and the inner surface of the peripheral wall of the drum there are provided pressure members which receive the insert element and which by means of adjusting elements, engaging said members, are at least radially adjustable in relation to the axis of rotation of the drum and securable in their adjusted position.

The cpnveyor belt drum of the invention firstly offers the advantage in respect of assembly that no expensive hydraulic clamping device is necessary for installing and removing the end members of the drum.

With the aid of the means of the invention the end members of the drum can be installed in a simple manncr without workshop intervention by placing the end members of the drum in their final inserted position in relation to the peripheral wall of the drum, radially adjusting by means of the adjusting elements the pressure members receiving the insert elements, and securing them in their adjusted position. Thus, the rubber-elastic inserted elements are thereby subjected to clamping. In contrast to the object of the Specification 8430, according to which the elastic intermediate member is compressed in order to achieve a radial adjusting movement, the pressure members of the present invention, which receive the insert elements, are themselves radially adjusted while providing the grcatest possible protection for the elastic material.

Whereas in the case of the object of the West German Published Specification 1,804,044 the rubber-elastic insert elements are subjected to a not inconsiderable detrimental shearing loading in the course of the pressing-in of the end members of the drum, which occurs over a relatively long distance, in the case of the conveyor belt drum of the invention it was found possible for this shearing loading to be reduced to a minimum. This advantage is achieved for the reason that the end members of the drum are already in their final inserted position before the clamping of the inserted elements is effected. Moreover, by virtue of subsequent operation of the adjusting elements the invention permits individual readjustment of the insert element, particularly in cases whein the insert elements have worn to a certain extent.

As a further development of the invention the outer peripheral surface of the end member of the drum has a frusto-conical region on which the pressure members, which are in the form of wedge members, are adjustable substantially parallel to the axis of the drum, that is to say axially. For the purpose of clamping the insert elements a substantially radial adjusting movement is made through axial adjustment of the wedge members on the rising frusto-conical surface of the end member of the drum. The abovedescribed arrangement permits the advantage that the wedge members can be adjusted from the end face of the drum, which in particular permits re-tightening while the conveyor belt is still in place.

According to further optional features of the invention the pressure or wedge members have substantially the shape of a segment of a circle viewed from the end face of the drum.

The outer surface of each wedge member, facing the inner surface of the peripheral wall of the drum, expediently extends substantially parallel to the inner surface of the peripheral wall of the drum, while the inner surface of each wedge member, facing the end member of the drum, extends substantially parallel to the frusto-conical region of the end member of the drum. This embodiment of the invention permits on the one hand the close fitting of the cooperating wedge surfaces and on the other hand reliable clamping of the elastic insert elements.

According to a preferred embodiment, in which the wedge members made of metal, preferably of steel, lie with their wedge surfaces directly on the frusto-conical region of the drum end member, which is preferably of cast steel, the insert elements are disposed between the wedge members and the inner surface of the peripheral wall of the drum. In certain applications it may, however, be expedient for the insert elements to be disposed between the wedge members and the frusto-conical region of the end member of the drum.

According to further optional featurcs of the invention, the wedge members can be anchored in an expedient manner through the fact that the frusto-conical region of the end member of the drum is bounded at its radially outermost point by a shoulder extending around it and at least partly forming a support for the adjusting element, this shoulder being situated at a radial distance from the inner surface of the peripheral wall of the drum. More precisely, it has been found expedient to adopt a method of anchoring the wedge member in which the shoulder has axially directed screwthreaded bores in which adjusting screws serving as adjusting elements are held, these screws being supported externally against the wedge members and passing through the latter, for which purpose plain bores shaped in the form of slots in the radial direction are provided in the said wedge members.In such arrangement the plain bores having the shape of slots in the radial direction take into account the radial adjustment path of the wedge members.

Another embodiment of the conveyor belt drum according to the invention, in which the outer peripheral surface of the end member of the drum is made substantially symmetrical to a radial plane and in the form of a double truncated cone of a flat inverted V-shape, makes it possible for a relatively large number of wedge elements to be disposed on the respective end member of the drum, particularly in cases where in a driving conveyor belt drum relatively large driving torques have to be transmitted. In such cases it is expedient for the wedge members, together with their respective insert elements, to be disposed in pairs on the double frustoconical outer surface, substantially symmetrically to the radial plane.Preferably, in this arrangement a separate support, for example one associated with the end member of the drum, can be dispensed with if one wedge member of each pair of wedge members, constituting the support, has a substantially axially directed screwthreaded bore which receives as adjusting element an adjusting screw which passes in a plain bore through the wedge member lying axially opposite and at the outer end face of this bore is supported against the wedge member.

Each pair of wedge members in this arrangement can be conveniently operated with a few adjusting screws, or in the limit case with a single adjusting screw. It is an advantage that an adjusting screw of this kind can easily be operated from outside if the wedge member is disposed with the plain bore adjoining the respective end face of the drum.

Reliable displacement of the insert element, particularly also during the installation operation, is ensured in accordance with another optional feature of the invention in that each wedge member is provided with a shoulder seat which is situated at a radial distance from the inner surface of the peripheral wall of the drum and extends substantially coaxially to the axis of rotation of the drum, and which during the clamping adjusting movement presses axially against the insert element.

Furthermore, it has been found advantageous in practice for each insert element to be adhesively joined to its appertaining pressure member, for example by vulcanisation or adhesive bonding.

In order to achieve reliable and durable fastening of wedge members and insert elements by means of the adjusting elements, as another optional feature of the invention it is proposed that the adjusting elements should be held in the shoulder of the end member of the drum and also in the wedge members so as to be secured against deflection.

In this connection one embodiment is characterised in that each screwthreaded bore provided in the shoulder is in alignment with a plain bore in the respective appertaining wedge member, each of these bores lying with its centre longitudinal axis in a radial plane of the conveyor belt drum and extending substantially parallel to the coacting wedge surface.

In a further development of the invention the frusto-conical region of each end member of the drum, viewed in cross-section, forms a double arrangement of a substantially flat inverted V-shape with a collar provided on the ridge, each collar forming openings surrounding an adjusting element with clearance and directed substantially axially, for example slots whose greater width extends radially, the plain shank portion of each adjusting element passing through a plain bore in a wedge member, while the screwthreaded end of the adjusting element is received in a respective screwthreaded bore of an additional wedge element disposed substantially in mirror image symmetry in relation to the collar.

In order that the invention may be more readily understood, reference is made to the accompanying drawings which illustrate diagrammatically and by way of example embodiments thereof, and in which: Fig. 1 is a partial longitudinal section through a conveyor belt drum in accordance with the invention, Fig. 2 is an end view in the direction of the arrow II in Fig. 1 Fig. 3 is an enlarged view of the detail B in Fig. 2, Fig. 4 is an enlarged view of the detail A in Fig. 1 in longitudinal section on the line IV-IV of Fig. 3.

Fig. 5 shows another embodiment in a view similar to that of Fig. 4.

Fig. 6 shows a further embodiment in a view similar to that of Figs. 4 and 5, Fig. 7 is a partial longitudinal section through another embodiment of a conveyor belt drum Fig. 8 is an enlarged view of the detail B in Fig. 2, but relating to the embodiment of Fig. 7, Fig. 9 is an enlarged view of the detail Al in Fig. 7 in longitudinal section on the line IX-IX in Fig. 8, and Fig. 10 shows another embodiment in a view similar to that of Fig. 9.

For reasons of simplicity of illustration, Figs. 1 and 7 of the drawings show only part of a conveyor belt drum 10, which is shown in axial longitudinal section. In particular, the conveyor belt itself and the mounting of the conveyor belt drum have been omitted in the drawings.

A peripheral drum wall 11 of sheet steel and of circular cross-section encloses substantially disc-shaped drum end members 12, which are preferably of cast steel. The end members 12 are fastened on a drum axle or drum shaft, for rotation therewith, by damping means 13, the axis of rotation of the axle or shaft 14 being designated x.

The outer peripheral surface 15 of the end members 12 of the drum is frusto-conical in shape. On the frusto-conical surface 15 a coacting surface 16 of a wedge member 17, l7a, 17b, 17e or 17this seated with a close fit.

As can be seen particularly in Fig. 2, a number of these wedge members are uniformly distributed over the periphery of the end members 12 of the drum.

While the coacting surface 16 extends sub stantially parallel to the frusto-conical outer peripheral surface 15 of the end member 12 of the drum, the outer surface 19 of each wedge member, facing the inner surface 18 of the peripheral wall 11 of the drum, extends substantially parallel to the inner surface 18.

The outer surface 19 carries rubberelastic insert element 20. In the embodiment shown in Figs. I to 5 and 7 to 10 this insert element 20 is supported at the end ncar the end face of the drum on a shoulder seat 21 of the wedge member 17, l7a, 17c or 17d, and is joined adhesively, for example by vulean- isation or adhesive bonding to its wedge member.

The plain shank portion of an adjusting screw 22 passes in the axial direction (substantially parallel to the axis of rotation x) through a plain bore 23 in the wedge members 17, this bore 23 being shaped in the radial direction as a slot in Figs. 1 to 4. The slot-like shape of the bore 23 can be seen particularly in Fig. 3, in which three bores 23 are shown before the insertion of the adjusting screws 22. It can be seen particularly clearly from Figs. 2, 3 and 8 that the wedge members have substantially the shape of a segment of a circle. In the embodiments illustrated in Figs. 5 to 10, circular cylindrical plain bores 27 are provided.

In Figs. 1 to 4 and 9 the screwthreaded portion of the adjusting screw 22 passes, inside a screwthreaded bore 25, through a shoulder 24 extending around the end member 12 of the drum and projecting radially outwards.

As shown in Fig. 9, the plain bore 27 is in alignment with the screwthreaded bore 25, the centre longitudinal axes (not shown) of the two bores 25, 27 lying in a radial plane of the conveyor belt drum 10 and extending substantially parallel to the coacting surface 16.

It will easily be realised that when the adjusting screw 22 is tightened the wedge member moves towards the interior of the conveyor belt drum 10 relative to the end member 12 of the drum and parallel to the centre longitudinal axis of the screw 22, and at the same time is displaced radially outwards. It will also easily be appreciated that the relative movement of the insert element 20 relative to the peripheral wall 11 of the drum can be kept comparatively slight, thereby reducing to a minimum the shearing load on the insert element 20. In the drawings the arrangement is already shown in its clamped position, in which the insert element 20 is urged against the inner surface 18 of the peripheral wall of the drum.It can also clearly be seen that both the shoulder seat 21 and the shoulder 24 are situated radially at a distance from the inner surface 18 of the peripheral wall of the drum, so that an adequate movement of the end members 12 of the drum relative to the peripheral wall 11 of the drum is ensured.

As can be seen from Figs. 3 to 6, 9 and 10, the adjusting screws 22 are secured on the outwardly directed surfaces of the wedge members 17, 17a, 17b, 17e or 17d, by means of spring washers 28 against unintentional slackening.

Other embodiments are shown in Figs. 5 and 6. The two conveyor belt drums 10 are characterised in that they do not require an abutment in the form of a separate shoulder 24, as in the embodiment of Fig. 4, but that each two edge members 17a and 17b clamp one another mutually. The end members 12 of the drum are here provided on their outer peripheral surface with a double frustoconical outer surface which has the shape of a flat inverted V and which is formed of two frusto-conical regions 15 placed at an obtuse angle one against the other.

The respective wedge members shown on the right in Fig. 5 and Fig. 6 of the drawings are provided with a screw-threaded bore 26 which passes through them and each of which receives the screwthreaded end of an adjusting screw 22. The axial bore 27 inside the respective wedge members shown on the left in Figs. 5 and 6 is circular cylindrical and plain.

In the embodiment shown in Fig. 5, the insert elements 20 are located between the outer surfaces 19 of the wedge members and the inner surface 18 of the peripheral wall 11 of the drum, whereas in the embodiment shown in Fig. 6 the insert elements 20 are located between the coacting surfaces 16 of the wedge members and the frusto-conical outer peripheral surfaces 15 of the end members 12.

In Figs. 3 to 5 and 7 to 10 it can be clearly seen that when the arrangement is in the clamped state, as illustrated, the shoulder seats 21 are situated radially at a distance from the inner surface 18 of the peripheral wall 11 of the drum. This likewise applies similarly to the shoulder seats 21 shown in Fig. 6, which are situated radially at a distance from the frusto-conical outer peripheral surfaces 15 of the end member 12 of the drum, so that in this embodiment also, as in the other embodiments, a relative movement (nutating movement) is possible between the peripheral wall 11 and the end member 12 of the drum.

The particular feature of the embodiment shown in Fig. 10 consists in that, viewed in cross-section, the frusto-conical outer peripheral surface 15 of the end member 12 of the drum forms a double arrangement of substantially a flat inverted V-shape with a collar 24 provided on the ridge. In this arrangement the collar has an opening directed substantially axially and surrounding with clearance the adjusting screw 22. In the present case this opening forms a slot 29 whose greatest width extends in the radial direction of the conveyor belt drum 10.The arrangement is such that the plain shank portion of the adjusting screw 22 passes through a plain bore 27 in the wedge member 1 7e shown on the left in Fig. 10, while the screwthreaded end of the adjusting screw 22 is received in a screwthreaded bore 26 in the wedge member 1 7e shown on the right in Fig. 10. The screwthreaded bore 26 and plain bore 27 are in line with one another. The wedge members 17c, which are disposed substantially in mirror image symmetry in relation to the collar 24, move towards one another when the adjusting screw 22 is tightened, while at the same time the insert elements 20 are clamped in the radial direction.

In work sites where the atmosphere is particularly heavily dust-laden, for example in underground mines or ore handling sites, it may be expedient for the gaps left between pressure or wedge member 17 distributed over the periphery of the conveyor belt drum 10 to be sealed. Sealing of this kind is advantageous particularly when the conveyor belt drum 10 is a non-driven guide drum with inner mounting provided between the two end members 12 of the drum. The sealing can advantageously be effected by filling the previously mentioned gaps between the pressure or wedge member 17 with a permanently elastic or permanently plastic plastics material.

WHAT WE CLAIM IS: 1. A conveyor belt drum, comprising a peripheral wall surrounding two end members through both of which a shaft or axle passes and which are secured to the said shaft or axle, each end member of the drum being frictionally connected to the peripheral wall of the drum exclusively by means of at least one rubber-elastic insert element which is clamped between the outer peripheral surface of the end member and the inner surface of the peripheral wall of the drum, characterised in that between the outer peripheral surface of each said end member and the inner surface of the peripheral wall of the drum there are provided pressure members which receive the insert element and which by means of adjusting elements, engaging said members, are at least radially adjustable in relation to the axis of rotation of the drum and securable in their adjusted position.

2. A conveyor belt drum according to claim 1, wherein the outer peripheral surface of each end member has a frusto-conical region on which the pressure members in the form of wedge members are adjustable substantially parallel to the axis of rotation of the drum, that is to say axially.

3. A conveyor belt drum according to claim 2, wherein the wedge members have substantially the shape of a segment of a circle, viewed from the end face of the drum.

4. A conveyor belt drum according to claim 2 or claim 3, wherein an outer surface of each wedge member, facing the inner surface of the peripheral wall of the drum, extends substantially parallel to the inner surface of the peripheral wall of the drum, while a coacting surface of each wedge member, facing the end member of the drum, extends substantially parallel to the frusto-conical region of the end member of the drum.

5. A conveyor belt drum according to any of claims 2 to 4, wherein the insert elements are disposed between the wedge members and the inner surface of the peripheral wall of the drum.

6. A conveyor belt drum according to any of claims 2 to 4, wherein the insert elements are disposed between the wedge members and the frusto-conical region of the end member of the drum.

7. A conveyor belt drum according to any of claims 2 to 6, wherein the frustoconical region of each end member of the drum is provided at one point with a shoulder extending around it and at least partly

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. respective wedge members shown on the left in Figs. 5 and 6 is circular cylindrical and plain. In the embodiment shown in Fig. 5, the insert elements 20 are located between the outer surfaces 19 of the wedge members and the inner surface 18 of the peripheral wall 11 of the drum, whereas in the embodiment shown in Fig. 6 the insert elements 20 are located between the coacting surfaces 16 of the wedge members and the frusto-conical outer peripheral surfaces 15 of the end members 12. In Figs. 3 to 5 and 7 to 10 it can be clearly seen that when the arrangement is in the clamped state, as illustrated, the shoulder seats 21 are situated radially at a distance from the inner surface 18 of the peripheral wall 11 of the drum. This likewise applies similarly to the shoulder seats 21 shown in Fig. 6, which are situated radially at a distance from the frusto-conical outer peripheral surfaces 15 of the end member 12 of the drum, so that in this embodiment also, as in the other embodiments, a relative movement (nutating movement) is possible between the peripheral wall 11 and the end member 12 of the drum. The particular feature of the embodiment shown in Fig. 10 consists in that, viewed in cross-section, the frusto-conical outer peripheral surface 15 of the end member 12 of the drum forms a double arrangement of substantially a flat inverted V-shape with a collar 24 provided on the ridge. In this arrangement the collar has an opening directed substantially axially and surrounding with clearance the adjusting screw 22. In the present case this opening forms a slot 29 whose greatest width extends in the radial direction of the conveyor belt drum 10.The arrangement is such that the plain shank portion of the adjusting screw 22 passes through a plain bore 27 in the wedge member 1 7e shown on the left in Fig. 10, while the screwthreaded end of the adjusting screw 22 is received in a screwthreaded bore 26 in the wedge member 1 7e shown on the right in Fig. 10. The screwthreaded bore 26 and plain bore 27 are in line with one another. The wedge members 17c, which are disposed substantially in mirror image symmetry in relation to the collar 24, move towards one another when the adjusting screw 22 is tightened, while at the same time the insert elements 20 are clamped in the radial direction. In work sites where the atmosphere is particularly heavily dust-laden, for example in underground mines or ore handling sites, it may be expedient for the gaps left between pressure or wedge member 17 distributed over the periphery of the conveyor belt drum 10 to be sealed. Sealing of this kind is advantageous particularly when the conveyor belt drum 10 is a non-driven guide drum with inner mounting provided between the two end members 12 of the drum. The sealing can advantageously be effected by filling the previously mentioned gaps between the pressure or wedge member 17 with a permanently elastic or permanently plastic plastics material. WHAT WE CLAIM IS:

1. A conveyor belt drum, comprising a peripheral wall surrounding two end members through both of which a shaft or axle passes and which are secured to the said shaft or axle, each end member of the drum being frictionally connected to the peripheral wall of the drum exclusively by means of at least one rubber-elastic insert element which is clamped between the outer peripheral surface of the end member and the inner surface of the peripheral wall of the drum, characterised in that between the outer peripheral surface of each said end member and the inner surface of the peripheral wall of the drum there are provided pressure members which receive the insert element and which by means of adjusting elements, engaging said members, are at least radially adjustable in relation to the axis of rotation of the drum and securable in their adjusted position.

forming a support for the adjusting member, this shoulder being situated at a radial distance from the inner surface of the peripheral wall of the drum.

8. A conveyor belt drum according to claim 7, wherein the shoulder is provided at the radially outermost point of the end member of the drum and has an axially directed screwthreaded bore in which an adjusting screw is held as an adjusting element, said screw being supported externally against the wedge member and passing through the latter, for which purpose a plain bore in the form of a slot in the radial direction is provided in the said wedge member.

9. A conveyor belt drum according to any of claims 2 to 7, wherein the outer peripheral surface of each end member of the drum is made substantially symmetrical to a radial plane and has the shape of a double truncated cone of a flat inverted V-shape.

10. A conveyor belt drum according to claim 9, wherein the wedge members, together with their respective insert elements, are disposed in pairs on the double frustoconical outer surface substantially symmetrically to the radial plane.

11. A conveyor belt drum according to claim 10, wherein one wedge member of each pair of wedge members constitutes a support for the adjusting element and has a substantially axially directed screwthreaded bore which receives as adjusting element an adjusting screw which passes in a plain bore through the wedge member lying axially opposite, and at the outer end face of this bore is supported against the wedge member.

12. A conveyor belt drum according to claim 11, wherein the wedge member with the plain bore is disposed adjoining the respective end face of the drum.

13. A conveyor belt drum according to any of claims 2 to 12, wherein each wedge member is provided with a shoulder seat which is situated at a radial distance from the inner surface of the peripheral wall of the drum and extends substantially coaxially to the axis of rotation of the drum, and which during the clamping adjusting movement presses axially against the insert elements.

14. A conveyor belt drum according to any of the preceding claims, wherein each insert element is joined adhesively, for example by vulcanisation or adhesive bonding, to its appertaining pressure member.

15. A conveyor belt drum according to claim 7, wherein each adjusting element is held in the shoulder and also in the wedge member so as to be secured against deflection.

16. A conveyor belt drum according to claim 8, wherein each screwthreaded bore provided in the shoulder is in alignment with a plain bore in the respective appertaining wedge member, each of these bores lying with its centre longitudinal axis in a radial plane of the conveyor belt drum and extending substantially parallel to said coating surface.

17. A conveyor belt drum according to claim 2, wherein the frusto-conical region of each end member of the drum, viewed in cross-section, forms a double arrangement of substantially flat inverted V-shape having a collar provided on the ridge, each collar forming openings surrounding an adjusting element with clearance and directed substantially axially, for example slots whose greater width extends radially, a plain shank portion of each adjusting element passing through a plain bore in a wedge member, while the screwthreaded end portion of the adjusting element is received in a respective screwthreaded bore of an additional wedge element disposed substantially with mirror image symmetry in relation to the collar.

18. A conveyor belt drum, substantially as herein described with reference to and as shown in the accompanying drawings.