Method and device for emptying a drum filled with solids

Information

  • Patent Grant
  • 6237808
  • Patent Number
    6,237,808
  • Date Filed
    Monday, November 1, 1999
    25 years ago
  • Date Issued
    Tuesday, May 29, 2001
    23 years ago
Abstract
In a method for emptying drums which are filled with solids and the lids of which have already been removed, the drum base is separated from the drum and the solids are forced out of the drum with the aid of a pressing body.An apparatus for emptying drums filled with solids has a cutting ring for removing the drum base. For the purpose of emptying the drum freed from the drum base and the rum lid, the apparatus has a pressing body which is in the form of a ram and, driven by hydraulic cylinders, can be displaced along the longitudinal axis in the direction of the cutting ring. A stop supports the drum against force acting in the direction of displacement while the solids are being forced out of the drum by the ram.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




The invention relates to a method for emptying drums filled with solids and to an apparatus for emptying drums filled with solids.




2. Discussion of the Prior Art




To fully exploit the holding capacity of drums, drums are nowadays often filled with solids with the aid of a so-called “drum compactor”, i.e. the solids are highly compressed as they are introduced into the drums and are stored in compacted form in the drum. The compaction gives rise to a compact mass of solids in which in some cases the individual parts and particles adhere firmly to one another. A drum packed in this way and filled with a firmly cohering mass of solids can often no longer be emptied simply with the aid of gravity by turning the drum over with the lid end downwards after removal of the drum lid. Highly viscous materials, which of course behave in a similar way to firmly cohering solids, are also often virtually impossible to remove from their drums. Simply turning the drums over and repeatedly jerking the inverted drum upwards are often unsuccessful both in the case of drums containing highly viscous materials and those containing compacted solids. Attempts to empty the drum with the aid of an auger are likewise often unsuccessful. Burning the drums with their contents in the case of waste drums is generally not justifiable from an ecological point of view and is moreover uneconomical since the drums may damage the lining of the incineration furnaces. The downtimes for repairing an incineration plant and the costs of repair themselves make it uneconomical to incinerate the drums, especially in the case of incineration furnaces for special waste.




SUMMARY OF THE INVENTION




It is therefore the object of the present invention to provide a method and an apparatus for emptying drums filled with solids in a simple and effective manner.




In the method according to the invention, a drum which has been freed from its lid is separated from its drum base and the solids which it contains, which may also include highly viscous materials, are forced out of the drum with the aid of a pressing body which penetrates into the drum. The advantage of this method resides in the fact that the drum can always be emptied, irrespective of the composition and consistency (compaction) of the solids. Loose solids fall more or less spontaneously out of the drum when they are pushed out of the drum by a pressing body, while highly compacted solids are driven out of the drum in the form of a plug by the pressing body.




It is advantageous if the drum base is cut off the drum by means of a cutting ring on which the drum is placed approximately vertical on its drum base. This ensures that the cutting forces which occur are distributed uniformly over the approximately circular cutting line defined by the cutting ring.




A particular advantage is obtained if a cutting force acting on the longitudinal axis of the drum is applied since this ensures that only forces parallel to the drum wall act on the drum. The cutting ring then acts like a punching tool.




If the pressing body penetrates into the drum at the lid end, the lid having previously been removed, the separation of the drum base from the drum and the emptying of the drum can be performed in a single working step. Another advantage of this procedure is that the cutting force is transmitted to the cutting ring via the solids inside the drum and via the drum base, and deformation of the drum can therefore be largely avoided.




An apparatus according to the invention makes it possible to use a cutting ring to separate a drum base from the drum, giving access to solids in the drum at the lid end and at the base end. This enables the solids to be forced out of the drum, with the aid of a pressing body provided in the apparatus and of a stop. Arranging the cutting ring, the stop and the pressing body on a longitudinal axis which corresponds to the longitudinal axis of the drum to be positioned enables the drum to be left in the same position in the apparatus for all the working steps. While the solids are forced out of the drum, the drum is supported by a drum wall edge on the stop. This ensures that the only forces acting on the drum wall as the solids are forced out are axial and this is particularly advantageous.




It is advantageous if the pressing body is arranged in such a way relative to the cutting ring and the stop that it penetrates into the drum at the lid end and the drum is emptied at the bottom. This allows the separated drum base to be forced out of the drum and disposed of together with the solids without the risk that the drum base will tilt in the drum.




In a particularly advantageous embodiment, the cutting ring is dimensioned in such a way that it cuts within the drum wall. This makes it easier to position the drum on the cutting ring since the projecting drum wall generally surrounds the drum base in the form of a bead. It is also advantageous if the cutter of the cutting ring is designed with teeth, ideally with triangular teeth, since this means that the cutting force initially acts only pointwise at the tips of the teeth, facilitating penetration of the cutter into the drum base.




It is particularly advantageous to configure the stop in such a way that the drum wall edge rests over its entire circumference on the stop since this ensures uniform distribution of the forces acting on the drum wall over the entire drum wall. A grid or a plate or something similar having an aperture concentric with the cutting ring can be used as the stop, for example. The radius of this aperture preferably corresponds to at least an external radius of the pressing body since this allows the drum to be emptied without obstruction. Moreover, it allows the pressing body to be moved through such an aperture in the stop without problems.




In a particularly advantageous embodiment, the cutting ring is arranged in a fixed manner and the pressing body can be displaced along the longitudinal axis in the direction of the cutting ring in the form of a ram. Such an embodiment allows the drum base to be cut off and the solids to be forced out of the drum in a single working step.




In such an embodiment, it is advantageous if the cutting ring is fixed in a holding device which simultaneously forms the stop.




In addition to the cutting ring secured in or on the holding device, it is advantageous to provide an additional stop, which is arranged between the drum to be positioned and the holding device and can be displaced along the longitudinal axis. Such a stop has an aperture with a radius that is greater than the external radius at the cutting ring and can be displaced between a holding position and a stop position. In the holding position, the stop is positioned ahead of the cutting ring in the direction of the drum while, in the stop position, the cutter of the cutting ring is positioned ahead of the stop in the direction of the drum. This allows the stop to be used both for positioning the drum on the cutting ring and, after emptying, to be used again to release the drum from the cutting ring.




If the stop can be displaced beyond the holding position in the direction of the pressing body, it can be used to help compress the drum wall against a stop plate. In this arrangement, the stop plate is situated on the pressing-body side, opposite the stop, and at least one times the drum height from the latter. To stabilize the drum wall during compression, it is particularly advantageous to leave the pressing body within the drum wall until the pressing operation is complete.




A positioning device which positions the drum in the apparatus and preferably also removes the emptied drum from the apparatus allows the emptying of drums to be automated.




If the apparatus is positioned above a container, the solids can be collected in the container. Positioning the apparatus above a container in this way is recommended, for example, for emptying waste drums, the apparatus being arranged, for example, over a pit or a waste bunker.




If the entire apparatus is arranged in such a way that the drum is upright during emptying and the pressing body performs its working stroke from the top downwards, the action of gravity can additionally be used to empty the drum. In this case, moreover, there is no need for any additional holding devices for the drum since the drum is held on the cutting ring and the stop by gravity.




The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the inanition, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.











BRIEF DESCRIPTION OF THE DRAWINGS




The invention will be explained by way of example below with reference to the Figures, which are purely schematic and of which:





FIG. 1

shows an apparatus for emptying drums filled with solids, with a drum positioned in the apparatus before being positioned on a cutting ring of the apparatus;





FIG. 2

shows the apparatus and the drum from

FIG. 1

with the drum positioned on the cutting ring;





FIG. 3



a


is a side view of another preferred embodiment of the apparatus with a drum positioned in the apparatus, it being possible to move the stop towards the pressing body against a stop plate, thereby allowing a drum wall to be compressed in the direction of the longitudinal axis of the drum;





FIG. 3



b


shows the apparatus from

FIG. 3



a


in section along the line B—B; and





FIGS. 4



a


to


4




e


show a longitudinal section through a third preferred embodiment of the apparatus with a drum positioned in the apparatus at various stages of the process.











DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS





FIGS. 1 and 2

show an apparatus


10


according to the invention with a cutting ring


12


, a stop


14


and a pressing body


16


accommodated in such a way on a longitudinal axis


17


in a supporting frame


9


that the drum


18


to be positioned can be introduced vertically into the apparatus


10


with its drum base


58


at the bottom, as illustrated in

FIGS. 1 and 2

. The cutting ring


12


is then approximately horizontal underneath the drum


18


.




The cutting ring


12


is secured in a holding device


21


with the aid of a clamping ring


28


for example. The cutter


22


of the cutting ring


12


projects beyond the holding device


21


towards the drum


18


. In the embodiment shown in

FIGS. 1 and 2

, the opposite edge


26


of the cutting ring


12


from the cutter


22


is supported in a cutout


30


. A hole


34


in the holding device


21


, said hole being situated directly below the cutout


30


and arranged concentrically with respect to the cutting ring


12


, has a hole radius r


3


equal to the internal radius r


3


of the cutting ring


12


.




As can be seen clearly in

FIG. 2

, the cutting ring


12


is dimensioned in such a way that the cutter


22


cuts within the drum wall


32


. The external radius rl of the cutting ring


12


is thus smaller than the internal radius r


2


of the drum. The cutter


22


of the cutting ring


12


is in the form of triangular teeth


24


.




The pressing body


16


is in the form of a hydraulic ram


36


, which has a ram plate


38


. The ram plate


38


has a plate radius r


5


and the following applies: r


5


<r


2


<r


3


, r


4


. The ram


36


can be displaced from its rest position A along the longitudinal axis


17


by means of three hydraulic cylinder/piston units


40


, it being possible to move the ram plate


38


through the cutting ring


12


and the hole


34


in the holding device


21


during one working stroke. This makes it possible to prevent the cutting ring


12


and the hole


34


from becoming blocked.




In the example illustrated in

FIGS. 1 and 2

, the stop


14


is designed in such a way that it can be used both to position the drum


18


on the cutting ring


12


and to release the emptied drum


18


from the cutting ring


12


. For this purpose, the stop


14


is in the form of a plate


42


with an aperture


46


, the aperture radius r


6


of which is greater than the external radius rl of the cutting ring


12


. The stop


14


, designed as a plate


42


, is positioned in front of the holding device


21


relative to the drum


18


and arranged in such a way that the aperture


46


and the cutting ring


12


are concentric. The plate


42


can be displaced along the longitudinal axis


17


by means of hydraulic cylinders


48


, more specifically between a stop position a, in which the stop


14


rests on the holding device


21


of the cutting ring


14


(c.f. FIG.


2


), and a holding position b, in which the stop


14


is spaced apart from the holding device


21


in such a way that it is positioned ahead of the cutter


22


of the cutting ring


12


(c.f.

FIG. 1

)




In the example shown in

FIGS. 1 and 2

, the hydraulic cylinders


48


are firmly connected to the holding device


21


, underneath the latter. The associated pistons


50


are passed through access openings


52


in the holding device


21


and firmly connected to the plate


42


. To allow easy positioning on the plate


42


and prevent sideways slipping of the drum


18


during the movement of the plate


42


, a hollow cylinder, for example, or some other retaining device


54


with a location opening


56


concentric with the hole


46


can be arranged on the plate


42


, as illustrated by broken lines in FIG.


1


. The location opening


56


is dimensioned in such a way that the drum


18


fits in with a clearance.




The apparatus


10


′ shown in

FIGS. 3



a


and


3




b


is of essentially identical construction to the apparatus


10


illustrated in

FIGS. 1 and 2

. Identical elements are therefore denoted by the same reference symbols. In contrast to apparatus


10


, the pressing body


16


in the apparatus


10


′ shown in

FIGS. 3



a


,


3




b


has not only a ram plate


38


but also a jacket cylinder


80


surrounding the hydraulic cylinders


40


and connected to the ram plate


38


. The jacket cylinder


80


prevents solids


60


which pass though a lateral gap between the drum wall


32


and the ram plate


38


from reaching the opposite side of the ram plate


38


from the drum


18


when the pressing body


16


penetrates into the drum


18


and possibly soiling the ram plate


38


and the hydraulics


40


. For this purpose, the ram plate


38


is either an accurate fit in the jacket cylinder


80


or the jacket cylinder


80


has the same external radius r


5


as the ram plate


38


and is placed against the ram plate


38


on the side away from the drum. It is very important, particularly in the case of drums filled with special waste, to prevent contamination of the opposite side of the ram plate from the drum with the contents of the drum.




Another difference with respect to the apparatus


10


illustrated in

FIGS. 1 and 2

is that a stop plate


82


is arranged on the same side as the pressing body


16


, opposite the cutting ring


12


. The stop


14


can be displaced hydraulically along the longitudinal axis


17


beyond its holding position b and into a pressing position c against this stop plate


82


, thereby allowing the drum wall


32


to be compressed once the drum


18


has been emptied. In this example, the hydraulic cylinders


48


for the pistons


50


which move the stop


14


are arranged on the same side as the pressing body


16


, the pistons being passed through openings


84


in the stop plate


82


. concentrically with the cutting ring


12


and the pressing body


16


, the stop plate


82


has another opening


86


to allow the pressing body


16


to be passed through.




As illustrated in

FIGS. 4



a


to


4




e


, it is also possible to provide the stop plate


82


with a hydraulic cylinder/piston unit


90


on the side remote from the drum and thus make the stop plate


82


movable in the direction of the stop


14


. It is also possible for the stop plate


82


and stop


14


to be designed in such a way that they can be moved towards one another.




For the sake of simplicity, the method for emptying a drum


18


filled with solids


60


, which is also taken to include highly viscous substances, will be described with reference to the apparatuses illustrated in the figures.




A drum


18


, the lid of which has already been removed, is transported into position by means, for example of a roller drive


88


of the type illustrated in

FIG. 3



a


and is set up on the stop


14


, which is in the holding position b, by means of a positioning device


92


, for example, of a driven hollow cylinder of adjustable diameter or a corresponding robotic grab of the type illustrated in

FIG. 4



a


. Here, the drum stands on the plate


42


of the stop


14


concentrically with the aperture


46


in the stop


14


, with its drum base


58


facing downwards. The stop


14


is now displaced into the stop position c, the drum


18


coming to rest by its base


58


on the cutting ring


12


, as shown in

FIGS. 2 and 4



b


. The ram


36


is now displaced against the cutting ring


12


along the longitudinal axis


17


, as shown in

FIG. 4



b


. The ram


16


penetrates into the drum


18


at the lid end and its ram plate


38


initially compresses the solids


60


in the drum


18


against the drum base


58


. When the solids


60


cannot be compressed further, the pressure acting in a uniformly distributed manner on the solids


60


via the ram plate


38


is transmitted fully to the drum base


58


and to the cutting ring


12


. The pressure acting in the direction of the cutting ring, parallel to the drum wall, acts as cutting force and presses the drum base into the teeth


24


of the cutting ring


12


. Finally, the drum base


58


is separated from the drum


18


as in a punching process.




The drum base


58


can now be collected in a collecting container


94


underneath the cutting ring


12


together with the solids


60


from the drum


18


. However, it is also possible for the drum base


58


to be separated from the contents beforehand by means of a corresponding transport apparatus


96


and transported into a separate container


98


for the drum material.

FIG. 4



b


shows a transport apparatus


96


with a hydraulic cylinder


70


and an associated piston


72


as an example. A dish-type element


76


with a flange


78


is connected by a joint


74


to the piston


72


at the front end of the piston


72


. While the drum base


58


is being separated from the drum


18


, the dish-type element


76


is underneath the cutting ring


12


to catch the drum base


58


if it falls downwards after being cut off. The drum base


58


is transported hydraulically on the dish-type element


76


until it is above container


98


. By means of the joint


74


, the dish-type element


76


is tilted through at least 90° above the container


98


and the drum base


58


is dropped from the dish-type element


76


into the container.




The working stroke of the pressing body


16


continues and the drum


18


is pressed down together with its contents above the cutting ring


12


until the edge


62


of its wall strikes the stop


14


and is held by the latter against the pressure of the pressing body


16


. The solids


60


are pushed further downwards by the ram


36


and forced out of the drum


18


at the bottom and then through the hole


34


in the holding device


21


into the collecting container


94


. If the drum base


58


sticks to the solids


60


from the drum


18


, it is pushed out of the drum


18


together with the solids


60


and can be stripped laterally off the solids


60


by means of the flange


78


when it reaches the dish-type element


76


.




The separation of the drum base


58


from the drum


18


and the emptying of the drum


18


are thus performed in a single working step. In this process, relatively loose solids


60


are first of all compacted by the ram


36


before the drum base


58


is separated from the drum


18


and fall in compacted form out of the drum


18


or fall out loose if compaction has not caused the solid particles in the drum


18


to stick together. Solids


60


stored in a highly compacted form in the drum


18


, on the other hand, cannot generally be compacted further and are forced out of the drum like a plug.




After emptying, the stop


14


is displaced back into the holding position, the drum


18


, which rests by the edge


62


of its wall on the stop


14


, being pushed upwards beyond the cutting ring


12


and released from the cutting ring


12


.




In the embodiment of the apparatus


10


illustrated in

FIGS. 1 and 2

, the empty drum


18


is now removed from the stop


14


by means, for example, of a positioning device


92


, as shown in

FIG. 4



a


, or a removal device and is disposed of in a collecting container


96


, for example.




In the apparatuses


10


′,


10


″ illustrated in

FIGS. 3



a


,


3




b


and


4




a


to


4




e


, the cylindrical drum wall


38


is then compressed in the direction of the longitudinal axis


17


following the emptying of the drum


18


. For this purpose, either the stop


14


can be moved hydraulically up to the stop board


82


, as in

FIG. 3



a


, or the stop board


82


can be moved hydraulically towards the stop


14


, as shown in

FIGS. 4



a


to


4




e


. For the purpose of stabilization, the jacket cylinder


88


of the pressing body


16


remains in the center of the drum wall


58


as the latter is compressed, as can be seen from

FIG. 4



c


. Finally, the compressed drum wall


32


′ can be removed from the apparatus


10


,


10


″ by means of a corresponding device


100


, as illustrated in

FIG. 4



d


, and can, for example, likewise be transported into the container


98


for the drum material.




Finally, a new drum


18


filled with solids


60


can be positioned and the process can begin again.




Instead of a cutting force applied solely in the form of a pressure acting parallel to the drum wall, it is also conceivable for the cutting ring to be rotated rapidly in addition, giving rise to sheer forces, with the result that the separation of the drum base


58


from the drum


18


resembles less a punching operation than a cutting operation.




The apparatus


10


,


10


′,


10


″ can of course also be arranged with its longitudinal axis


17


horizontal or sloping downwards. An upward slope or even a mirror-inverted arrangement is also conceivable but, with these embodiments, a special holding device must be provided to hold the drum


18


since it is not held on the cutter


22


of the cutting ring


12


by gravity.




Instead of the displaceable stop


14


, it is also possible, for example, for the holding device


21


of the cutting ring


12


to be provided as stop


14


. The stop


14


and the stop plate


82


can also be implemented as a grid instead of as a plate or in the form of bracing formed, for example, by beams.




Displacement of the cutting ring


12


and of the stop


14


together with the drum


18


against a pressing body


16


is also conceivable and would lead to the same goal, as would moving elements


12


,


14


and


16


/


36


towards one another.




The pressing body


16


/


36


can also be driven into the drum


18


at the bottom and the solids


60


can be forced out at the lid end. In that case, however, the drum base


58


may have to be removed in a separate step or be pushed through the drum


18


with the solids


60


.




Even holding the drum


18


during the working stroke of the pressing body by some other means than the stop


14


is conceivable provided the forces for holding the drum are not greater than the resistance to deformation of the drum walls


32


. However, this should seldom be the case with drums containing compressed materials and made from conventional drum materials.




The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the scope of protection defined by the appended patent claims.



Claims
  • 1. A method for emptying a drum which has a base and is filled with solids and has been freed from its drum lid, comprising the steps of:separating the drum base from the drum; and forcing the solids out of the drum with a pressing body that penetrates into the drum.
  • 2. A method as defined in claim 1, wherein the separating step includes separating the drum base from the drum with a cutting ring by positioning the drum approximately vertically with the drum base on the cutting ring.
  • 3. A method as defined in claim 2, wherein the cutting ring is horizontally arranged beneath the drum.
  • 4. A method as defined in claim 2, further including applying a pressure, acting in a direction of a longitudinal axis of the drum, to the cutting ring as a cutting force for separating the drum base from the drum.
  • 5. A method as defined in claim 4, wherein the step of applying pressure includes applying the cutting force by means of the pressing body via the solids in the drum and the drum base.
  • 6. A method as defined in claim 1, wherein the pressing body penetrates into the drum at the lid end and the solids are forced out of the drum at the base end, and the separation of the drum base from the drum and the forcing out of the solids taking place in one working step.
  • 7. A method as defined in claim 6, further including supporting the drum by a drum wall edge against a stop while the solids are being forced out.
  • 8. A method as defined in claim 1, further including the step of compressing a drum wall in a direction of a longitudinal axis of the drum.
  • 9. A method as defined in claim 8, wherein the pressing body remains in a center of the drum wall to perform a stabilizing function during the compressing step.
  • 10. An apparatus for emptying a drum which is filled with solid and has been freed from its drum lid, comprising:a cutting ring for separating a base from the drum; a pressing body for forcing the solids out of the drum by penetrating into the drum; and a stop for supporting a drum wall edge of the drum while the solids are being forced out of the drum, the cutting ring, the pressing body and the stop being arranged on a longitudinal axis corresponding to a longitudinal axis of the drum positioned in the apparatus, the stop and the pressing body being arranged so that the drum is placeable between them, at least one of the stop and the pressing body being displaceable along the longitudinal axis.
  • 11. An apparatus as defined in claim 10, wherein the pressing body is arranged relative to the cutting ring and the stop so that it penetrates into the drum at the lid end and forces the solids out of the drum at the base end during performance of a working stroke.
  • 12. An apparatus as defined in claim 10, wherein the cutting ring is dimensioned so that it cuts the drum base within the drum wall.
  • 13. An apparatus as defined in claim 12, wherein the cutting ring includes a toothed cutter.
  • 14. An apparatus as defined in claim 13, wherein the toothed cutter has triangular teeth.
  • 15. An apparatus as defined in claim 10, wherein the stop is designed so that it supports the drum wall edge over its entire circumference, the stop having a circular aperture arranged approximately concentrically with respect to the cutting ring and having a radius that is no larger than an internal radius of the drum.
  • 16. An apparatus as defined in claim 15, wherein the stop is formed as one of a grid and a plate.
  • 17. An apparatus as defined in claim 15, wherein the radius of the circular aperture of the stop is at least as large as a radius of the pressing body.
  • 18. An apparatus as defined in claim 10, wherein the cutting ring is arranged in a fixed manner, the pressing body being a ram displaceable towards the cutting ring so as to have an amplitude of motion corresponding to at least one times the drum height.
  • 19. An apparatus as defined in claim 18, and further comprising a holding device, the cutting ring being fixed in the holding device.
  • 20. An apparatus as defined in claim 19, wherein the holding device is a body with an approximately circular hole, the cutting ring being secured concentrically one of in and above the hole, the holding device forming the stop.
  • 21. An apparatus as defined in claim 20, wherein the holding device is formed as one of a grid a plate.
  • 22. An apparatus as defined in claim 19, wherein the stop is arranged between the drum to be positioned and the holding device of the cutting ring and is displaceable along the longitudinal axis, more specifically between a stop position in which a cutter of the cutting ring projects beyond the stop in the direction of the drum, and a holding position in which the stop is spaced apart from the holding device in such a way that it projects beyond the cuter of the cutting ring in the direction of the drum so as to position the drum on the cutting ring and to release the drum from the cutting ring after emptying the drum.
  • 23. An apparatus as defined in claim 22, wherein the stop rests on the holding device of the cutting ring.
  • 24. An apparatus as defined in claim 22, wherein a stop plate is arranged at a level of a rest position of the pressing body and wherein one of the stop and the stop plate is movable so that a drum wall can be compressed between the stop and the stop plate.
  • 25. An apparatus as defined in claim 18, wherein the ram includes a ram plate.
  • 26. An apparatus as defined in claim 25, wherein the ram plate is connected to a jacket cylinder so that no contents of the drum can reach a side of the ram plate which lies opposite to the drum.
  • 27. An apparatus as defined in claim 18, wherein the ram has a ram radius which is smaller than an internal radius of the cutting ring and the amplitude of motion during a working stroke extends from a rest position of the ram.
  • 28. An apparatus as defined in claim 10, wherein the stop is designed so that it supports the drum wall edge over its entire circumference, the stop having a circular aperture arranged approximately concentrically with respect to the cutting ring and having a radius that is no larger than an internal radius of the drum, the cutting ring being arranged in a fixed manner, the pressing body being a ram displaceable towards the cutting ring so as to have an amplitude of motion corresponding to at least one times the drum height, the holding device being a body with an approximately circular hole, the cutting ring being secured concentrically one of in and above the hole, the holding device forming the stop, the ram having a ram radius which is smaller than an internal radius of the cutting ring and the amplitude of motion during a working stroke extending from a rest position of the ram through the cutting ring and one of the aperture and the hole in the stop.
  • 29. An apparatus as defined in claim 10, and further comprising means for positioning the drum above the cutting ring.
  • 30. An apparatus as defined in claim 10, and further comprising a container arranged below the drum so that the solids forced out of the drum enter the container.
Priority Claims (1)
Number Date Country Kind
2199/98 Oct 1998 CH
US Referenced Citations (4)
Number Name Date Kind
4126160 Gurtler Nov 1978
4396340 Clinton Aug 1983
4735368 Janko et al. Apr 1988
5109763 Morris et al. May 1992
Foreign Referenced Citations (2)
Number Date Country
2 082 540 Mar 1982 GB
2 099 928 Dec 1982 GB