EP1618258A1 - Verfahren zum pneumatischen aufnehmen von erdreich für saugvorrichtungen und absaugrohr hierzu sowie verwendung eines derartigen absaugrohres - Google Patents
Verfahren zum pneumatischen aufnehmen von erdreich für saugvorrichtungen und absaugrohr hierzu sowie verwendung eines derartigen absaugrohresInfo
- Publication number
- EP1618258A1 EP1618258A1 EP04721120A EP04721120A EP1618258A1 EP 1618258 A1 EP1618258 A1 EP 1618258A1 EP 04721120 A EP04721120 A EP 04721120A EP 04721120 A EP04721120 A EP 04721120A EP 1618258 A1 EP1618258 A1 EP 1618258A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crown
- suction
- compressed air
- suction pipe
- soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
- E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head
- E02F3/9262—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with jets
Definitions
- the invention relates to a method for pneumatically picking up soil according to the thin-stream method for suction devices, such as suction excavators, by means of a suction air stream using a pneumatic suction pipe with a crown arranged at the lower end facing the soil, and an air supply device for compressed air to the crown under generation a compressed air flow loosening the soil in the area of the crown, according to the preamble of claim 1. Furthermore, the invention relates to a pneumatic suction pipe for carrying out the method according to claim 5, and also to the use of such a suction pipe according to claim 26.
- suction dredgers When working on buried supply systems as well as for manufacturing them, so-called pneumatic suction dredgers are used to excavate the soil, which work according to the thin-stream method, which means that the masses conveyed are small in quantity in relation to the transport medium air, with a fast-flowing air flow for transport of the soil is used.
- suction dredgers have at their suction end a suction nozzle or a suction pipe which has a crown at the lower end facing the ground, which is serrated and is driven into the ground for each suction process with a predetermined pressure, at least under the weight of the suction pipe.
- Blow lances are known for this purpose, which are supplied with compressed air by a compressor installed on the suction excavator.
- DE 29902561 U1 has disclosed a pneumatic break-open tool for suction excavators, which is tailored to the physical conditions of a suction excavator and is integrated on the suction nozzle of the suction excavator.
- air lance batteries run as a pneumatic release device within the suction pipe, several air lances, which are coupled via a pressure distributor, being mounted on the suction nozzle of the suction excavator, the air lance optionally being arranged inside or outside, but preferably being arranged inside.
- the air lances have nozzles pointing downwards to the ground, which are located inside the suction crown and above the lower end thereof and are protected by the suction crown located on the outside.
- the air lances thus end in front of the lower end of the crown in order to prevent the air lances from hitting the ground when the crown hits the ground.
- the air lances are controlled in a clocked manner via a compressed air distributor, so that either a constant or a pulsed air flow is generated which emerges from the air nozzles at high speed.
- the disadvantage of this arrangement is that in order to achieve an at least reasonably satisfactory loosening effect of the soil, a high energy of the air flow at high speed is required, the speed of the air flow increasing in the supersonic area as it leaves the nozzle. This requires high pressures and high speeds of the air flows. If the ground is very hard, the crown is placed on the ground. The nozzles are then too far away from the soil to be sucked, so that the effect of the nozzles goes to zero, which means that the blowing performance is ineffective despite the supersonic.
- the invention has for its object to provide a method of the type mentioned, with which the disadvantages of the prior art are overcome and in particular high pressures and associated high energy consumption are avoided.
- the advantage of the method according to the invention is that the compressed air is only introduced into the soil within the soil, namely a few centimeters to fifteen centimeters inside the soil below the crown.
- an earth core of approximately the size or smaller of the clear cross section of the crown is pushed up and detached, in particular when several compressed air streams are shot in synchronously, so that this earth core can be sucked off by the suction flow through the suction tube.
- energy for generating the compressed air can be saved because the generated compressed air flow or the compressed air flows no longer have to be increased in the supersonic range.
- a plurality of compressed air streams can be generated below the peripheral edge of the crown or in the region of the peripheral edge of the crown within the soil, starting from the central axis of the crown, and preferably synchronously, wherein the compressed air flows are directed radially outward from the central axis of the crown.
- the compressed air flow is pressed into the same in the form of a series of pulses within the soil, the pulse frequency of the compressed air flow being controlled or regulated by the hardness of the soil by means of a compressed air sensor.
- the compressed air sensor measures the pressure of the compressed air flow within the soil, whereby the pulse frequency increases in the case of harder soil, whereas the pulse frequency is decreased in the case of softer soil.
- a patented pneumatic suction pipe for the pneumatic picking up of soil using the thin-stream method for suction devices, such as suction excavators, when generating a suction air flow, with a crown arranged at the lower end facing the soil, a suction hose being connectable to the upper end of the suction pipe and with an air supply device for Compressed air to the crown producing a compressed air flow loosening the soil in the area of the crown is characterized in that the air supply device comprises at least one pointed tube, which projects downward over the crown in the direction parallel to the central axis of the suction tube and for penetrating into the soil and for blowing in a compressed air stream within the soil in the same below the crown parallel to a cross-sectional plane of the same is suitable for pushing up and detaching an earth core of approximately the size or smaller of the clear cross-section of the crown and suctioning the Earth core through the suction pipe.
- the air supply device can be a single pointed tube running along the central axis of the crown, which in the region of the lower end has at least one outlet opening for the compressed air which is directed radially outward in the cross-sectional plane of the crown. There are preferably three outlet openings, each distributed around the circumference of the pointed tube by 120 degrees.
- the air supply device comprises a plurality of pointed tubes distributed peripherally around the crown, which project downward over the crown in the direction parallel to the central axis of the suction tube and which in the region of their lower ends each have a radially inward direction in the cross-sectional plane of the crown Have central axis directed outlet opening for the compressed air.
- the air supply device comprises an air ring tube which is arranged peripherally around the crown and forms a compressed air tank into which a compressed air tube opens, the pointed tubes being arranged on the air ring tube downwards in a direction parallel to the central axis of the crown.
- the air supply device includes a pressure sensor inside the compressed air tube, which measures the instantaneous pressure inside the pointed tubes and, depending on the measured pressure, opens or closes an air valve arranged on the compressed air tube.
- the air supply device comprises the compressed air tube arranged vertically on the outside of the jacket of the suction tube, preferably perpendicularly in the direction of a surface line.
- the pointed tubes can have a tip at their outermost lower end, the diameter of the outlet opening of the pointed tubes being smaller than the diameter of the inlet opening.
- the pointed tubes can preferably protrude downward from the crown by an amount between 8 and 15 cm.
- the suction pipe has slots above the crown for the inflow of air bypassing the crown opening in the function of a bypass to ensure laminar flow in the suction pipe.
- the slots can extend peripherally around the suction tube, the length of the slots being considerably greater than the width of the slots , preferably in a length to width ratio such as 5: 1 to 20: 1.
- the slots can be closed and obvious, as can be adjustable in length and, if necessary, width.
- the suction pipe is composed of several parts and essentially consists of the crown, a middle piece and a connecting ring that follows.
- the suction pipe can advantageously be arranged in a guided manner and spring-loaded on a fixed upper part, to which a suction hose engages, a deformable connecting bellows being located between the upper part and the suction pipe.
- the upper part is a connecting sleeve which is connected at its lower end to the connecting bellows and at its upper end to the outgoing suction hose.
- a connecting ring can be arranged on the suction pipe at its upper end, which in turn is connected to the connecting bellows at its upper end.
- the upper part and the connecting ring each have at least one tubular or sleeve-shaped guide which coincides with one another, through which a guide shaft is guided, which is fastened within the guide of the upper part and which is movably held within the guide of the connecting ring and which is provided with an outside of the guide at the lower end of the same with a safety device to limit the travel of the guide shaft, a compression spring being arranged between the guide of the upper part and that of the connecting ring, which in the rest position in its greatest length extension has the upper part and the connecting ring on it keep the greatest possible distance.
- a contact device is arranged below the guide shaft, which is at a predetermined
- Travel and compression of the compression spring can be contacted by the guide shaft and triggers a signal, which in turn the air valve Compressed air supply to the pointed pipes opens and is able to supply a compressed air flow to the pointed pipes.
- the upper part can have a quick coupling, by means of which the upper part is detachably connected to the suction pipe.
- the middle piece of the suction tube has cutouts at its lower end, which serve to design the slots when connecting the middle piece to the crown.
- three ears for receiving three guide shafts can be arranged on the upper part for connecting the suction hose, as can the upper part carrying the air valve and a quick coupling for connecting the air pressure pipe to the compressed air supply.
- the invention furthermore relates to the use of a pneumatic suction tube with a crown arranged at the lower end directed towards the ground, a suction hose being connectable to the upper end of the suction tube, and with an air supply device for compressed air to the crown to produce a soil in the area of the crown loosening compressed air flow, the air supply device comprising at least one pointed tube, which projects downward above the crown in the direction parallel to the central axis of the suction tube and for penetrating into the ground and for blowing a compressed air flow within the soil into it below the crown parallel to one Cross-sectional plane of the same is suitable for pushing up and detaching an earth core of approximately the size or smaller of the clear cross section of the crown and suctioning the earth core through the suction tube for use for suction excavators or suction devices for the pneumatic absorption of soil After the thin-stream process when generating a suction air stream.
- the suction pipe according to the invention can thus also be retrofitted to existing suction excavators or suction devices in
- Figure 1 is a side view of a suction pipe of a suction excavator with a suction hose arranged at the upper end and a serrated crown arranged at the lower end of the suction pipe, with a compressed air pipe for supplying compressed air and with an air ring pipe which is arranged around the suction pipe and out of the pointed pipes the compressed air ear can be supplied with compressed air to loosen the soil, as well as with slots in the suction pipe for the supply of air from outside into the suction pipe in the form of a bypass bypassing the crown
- FIG. 2 shows an enlargement from FIG. 1 to show the connection sleeve for the suction hose going upwards, the connection ring for the suction pipe and the connecting bellows arranged between the two and the suction pipe located within the connection ring
- FIG. 3 shows a partially sectioned and enlarged side view of FIG. 1 of the lower part of the suction pipe with compressed air pipe, air ring pipe, the crown and a pointed pipe arranged on the air ring pipe
- FIG. 4 shows a section perpendicular to the longitudinal axis of the suction pipe through the suction pipe in the region of the lower end thereof above of the air ring raw res to the top view of the air ring tube, with the access of the compressed air tube shown in section into the air ring tube and the indicated downward-pointing connections of the pointed tubes to the air ring tube, namely along the section line AA in FIG. 3
- Figure 5 is a bottom view of the air ring tube without suction tube perpendicular to the central axis thereof, showing the connections of the pointed tubes shown in section Figure 5a is a cross section in a horizontal plane of the air ring tube of Figure 5, with the access of the air pressure tube and a connection for a pointed tube
- Figure 6 is a plan view of Figure 1 in the direction of the longitudinal axis of the suction tube on the upper part of the same with the omission of Suction hose, with a valve for supplying the compressed air pipe, the ears for the guide shafts of the suction pipe and the closures for attaching the suction pipe to the suction hose leading to the suction excavator Figure 7, the compressed air pipe guided on the outer wall of the suction pipe with valve in the view Y of Figure 3
- Figure 8 is a plan view of the upper part 4, connecting ring 4, of the suction pipe with the ears for the guide shafts
- FIG. 9 shows a side view of the middle part of the suction pipe, with cutouts at the lower end of the suction pipe carrying the crown and with air suction slots for the air flowing into the suction pipe from the outside in the form of a bypass bypassing the crown
- FIG. 10 shows a cross section through the middle part of the suction pipe perpendicular to its longitudinal axis to show the position of the air intake slots
- Figures 11, 11a, 11b different side views and a top view of the valve at the upper end of the air pressure tube for controlling the compressed air within the air ring tube and
- FIG. 12 shows a side view of one of the three guide shafts for guiding the connecting ring of the suction pipe on the connecting sleeve of the suction hose going upwards.
- Figures 1, 2 and 3 show a side view of a patented example of a suction pipe 3 for a suction device, in particular a suction excavator (not shown), with a suction hose 24 extending from the suction pipe 3 at the upper end and a serrated crown arranged at the lower end of the suction pipe 3 1 1.
- a compressed air pipe 10 for supplying compressed air into an air ring pipe 2 which is arranged in a ring around the suction pipe 3 in the area of the crown 1 1 and as a compressed air reservoir serves.
- Pointed tubes 1 preferably three or three, are arranged on the air ring tube 2, running vertically downward and parallel to the central axis 30 of the suction tube 3 more, the pipe interior of which is connected via an inlet opening 31 to the volume of the air ring pipe 2.
- the pointed tubes 1 protrude downwards from the crown 11 in the direction of the ground, and preferably by a few centimeters up to 25 cm, depending on the density of the ground.
- the normal of the plane of the outlet opening 32 is directed radially to the central axis 30 of the suction pipe 3 and is perpendicular to it, so that the compressed air stream emerging from each pointed pipe 1 is also directed radially to the central axis 30 of the suction pipe 3 in the direction of the normal.
- the pointed tubes 1, which protrude from the crown 11 down to the ground, are driven into the ground when the suction pipe 3 and thus the crown 11 impact on the ground, so that the outlet opening 32 of the pointed pipes 1 for the compressed air is located below the surface of the ground in the ground.
- the compressed air flow is switched on, it is blown into it below the crown 11 parallel to a cross-sectional plane of the crown 11 within the soil, as a result of which an earth core of approximately the size or less of the clear cross section of the crown 11 is pushed up and detached, which is through the suction pipe 3 is suctioned off.
- the diameter of the outlet opening 31 of the pointed tubes 1 is preferably smaller than the diameter of the inlet opening 32, which increases the Leaving air at high speed, which improves the ability to loosen the earth.
- the angle ⁇ of the tip 33 of the pointed tube 1 is preferably 30 °, as can be seen in FIG. 3, so that the pointed tubes 1 are well suited to penetrate into the ground.
- FIG. 2 shows an enlargement from FIG. 1 for a detailed representation of the upper part of the suction pipe 3 and of the holder thereof.
- a connecting ring 4 is fixedly placed on the suction pipe 3, on the upper end of which a bellows 27, for example a rubber hose 27, is placed, which in turn comprises an upper part 5 in the form of a connecting sleeve 5 with its upper end; the bellows 27 is firmly connected at both ends to the connecting ring 4 and the connecting sleeve 5 by means of hose clamps 16; the suction hose 24 leads from the connecting sleeve 5 to the suction excavator.
- the compressed air pipe 10 is welded to the suction pipe 3 from the outside.
- Figure 4 shows a section perpendicular to the central axis 30 of the suction pipe 3 through the suction pipe 3 in the region of the lower end thereof above the air ring pipe 2, namely along the section line AA in Figure 3, for a top view of the air ring pipe 2, with the access 29 shown in section Compressed air tube 10 in the air ring tube 2.
- the dashed indicated downward connections 23 of the pointed tubes 1 to the air ring tube 2 can be seen.
- the access 29 of the compressed air tube 3 and the connections 23 for the pointed tubes 1 can thus be seen.
- the connections 23 for the pointed tubes 1 are evenly distributed over the air ring tube and the arc length between two connections corresponds to an angle of 120 ° and the access 29 of the compressed air tube 10 lies in the middle between two connections 23.
- Figures 5 and 5a show on the one hand a view from below of the air ring tube 2 without suction tube perpendicular to the central axis of the same with the representation of one of the connection openings 23 within the air ring tube 2 with removed pointed tubes which are inserted into the connection openings 23 and on the other hand a cross section in a horizontal Level of the air ring tube 2 of Figure 5, with access 29 of the air pressure tube 10 in the air ring tube 2 and one of the Connection openings 23 for one of the pointed tubes. It can also be seen that the air ring tube 2 has no inner wall. This is not necessary because the air ring tube 2 is welded to the crown 11 or to the lower end of the suction tube 3.
- a guide is arranged both on the connecting sleeve 5 and on the connecting ring 4, which serves to enable a predetermined relative movement of the connecting sleeve 5 and the connecting ring 4 in the direction of their common central axis 30.
- the guide preferably consists of three upper guide sleeves 7, for example in the form of perforated ears 7, which are arranged on the connecting sleeve 5 and three lower guide sleeves or bushings 19, for example GAR-MAX bushings or also in the form of perforated Ears 19, which are arranged on the connecting ring 4.
- the guide sleeves 7, 19 face each other in the vertical direction along their coincident central axes.
- the guide sleeves 7, 19 are preferably arranged at equidistant intervals peripherally around the connecting sleeve 5 and the connecting ring 4.
- a guide shaft 6 is inserted through the opposite guide sleeves 7, 19, which is anchored in the upper guide sleeves 7.
- a nut 39 is screwed onto the lower end of the guide shaft 6, which protrudes from the lower guide sleeve 19 and has a thread.
- a compression spring 39 or a rubber buffer is arranged between the upper and lower guide sleeves 7, 19.
- the compression spring 39 pushes the connecting sleeve 5 and the connecting ring 4 apart so far in their rest position that the nut 39 strikes against the underside of the lower guide sleeve 19; on the other hand, the compressed compression spring 39 specifies the maximum path by which the guide shaft 6 can be compressed. Or on the guide shaft 6, a spacer sleeve 8 is placed, which is shorter by a distance "s" than the maximum distance between the connecting sleeve 5 and the connecting ring 4, so that the length of the spacing sleeve 8 specifies the relative stroke between the connecting sleeve 5 and the connecting ring 4.
- a contact device 25 is arranged below one of the nuts 39 screwed onto the lower end of one of the guide shafts 6.
- the contact Device 25 is then addressed by the downwardly extending guide shaft 6 and emits a control signal if, during the operation of the device, the guide shaft 6 moves downward out of the guide sleeve 19 due to the relative movement between the connecting sleeve 5 and the connecting ring 4 and the nut 39 the contact device 25 triggers.
- FIG. 6 shows a top view of FIG. 1, with the suction hose omitted, in the direction of the longitudinal axis of the suction pipe on the upper part thereof, with a compressed air valve 28 with an integrated pressure sensor for supplying the compressed air pipe 10, the ears 7 for the guide shafts 6 of the suction pipe 3, wherein screws 18 can also be seen, which penetrate the ears 7 and the guide shafts 6 for holding the guide shafts 6 in the ears 7.
- closures 26 can be seen for fastening the suction pipe 3 to the suction hose 24 leading to the suction excavator.
- FIG. 7 shows the compressed air pipe 10 and the compressed air valve 28 from the view Y in FIG.
- FIG. 6 the suction pipe 3 on the outer jacket wall of the suction pipe 3 leading down to the crown 11 and the air ring pipe 2.
- This figure also shows part of the connecting ring 4 of the suction pipe 3 and a quick coupling 21 for connecting the compressed air pipe 10 or the compressed air valve 28 to an external compressed air supply, a screw 22, a clamping part 13 and a base 12 for fastening the compressed air valve 28 ,
- the compressed air valve 28 has a pressure sensor which measures the instantaneous pressure within the compressed air tube 10. In the case of hard ground, that is, when the compressed air flow within the ground encounters increased resistance and the pressure thereby rises, the pulse frequency of the compressed air flow is increased and vice versa reduced.
- FIGS. 1, 9 and 10 A further special feature of the device can be seen from FIGS. 1, 9 and 10.
- the suction pipe 3 has, in the area of its lower end directly above the crown 11, slots 14 which serve to supply outside air into the suction pipe 3 bypassing the opening of the crown 11 in order to produce a laminar flow on the inner wall of the suction pipe 3, to keep them clean.
- FIG. 8 shows a top view of the upper part 4, the connecting ring 4, the suction pipe 3 with the ears 19 for the passage of the guide shafts 6.
- the ears 19 for the guide shafts 6 can be seen to be arranged at equal intervals and welded to the connecting ring 4.
- FIG. 9 shows a side view of a lower part 34 of the suction tube 3 without a crown 11; the suction pipe 3 can be composed of several parts.
- the cylindrical part 34 has cutouts 35 at its lower end within its edge, three such cutouts 35 preferably being distributed at equidistant intervals around the peripheral circumference of the part 34, as can be seen from FIG. 10.
- the cutouts 35 run in a cross-sectional plane of the part 34.
- this laminar flow prevents turbulence in the suction pipe 3, as does the deposition of soil effectively prevented within the suction tube, so that the suction tube 3 can be kept clean by this simple measure. This in turn has the consequence that the suction power does not decrease because there are no turbulences and turbulences in the suction pipe 3.
- FIG. 10 shows a cross section through the lower part 34 of the suction pipe 3 perpendicular to the central axis 30 of the suction pipe to show the position of the air suction slots 14.
- FIGS. 11, 11a and 11b show different side views and a top view of the mounting base 35 of the air pressure valve 28.
- FIG. 12 shows a side view of one of the three guide shafts 6 with a partial section for guiding the connecting ring 4 of the suction pipe 3 on the connecting sleeve 5 for holding the suction hose 24 going upward.
- the transverse bore 37 for the passage of the screw 18 for holding is visible within the partial section the shaft 6 inside the ear 7.
- the object of the invention is industrially applicable to suction dredgers.
- the utility of the invention consists in particular in that the introduction of the compressed air only takes place within the soil, whereby a core of the earth about the size or smaller of the clear cross section of the crown is pushed up and detached, so that this core of the earth is sucked in by the suction flow Suction tube can be suctioned off.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Air Transport Of Granular Materials (AREA)
- Jet Pumps And Other Pumps (AREA)
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10315335 | 2003-04-03 | ||
DE10318720 | 2003-04-25 | ||
DE10320238A DE10320238A1 (de) | 2003-04-03 | 2003-05-07 | Verfahren zum pneumatischen Aufnehmen von Erdreich für Saugvorrichtungen und Absaugrohr hierzu |
PCT/DE2004/000545 WO2004088049A1 (de) | 2003-04-03 | 2004-03-17 | Verfahren zum pneumatischen aufnehmen von erdreich für saugvorrichtungen und absaugrohr hierzu sowie verwendung eines derartigen absaugrohres |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1618258A1 true EP1618258A1 (de) | 2006-01-25 |
EP1618258B1 EP1618258B1 (de) | 2007-09-12 |
Family
ID=28678501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04721120A Expired - Lifetime EP1618258B1 (de) | 2003-04-03 | 2004-03-17 | Verfahren zum pneumatischen aufnehmen von erdreich für saugvorrichtungen und absaugrohr hierzu sowie verwendung eines derartigen absaugrohres |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1618258B1 (de) |
AT (1) | ATE373146T1 (de) |
DE (3) | DE20308281U1 (de) |
WO (1) | WO2004088049A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102146793A (zh) * | 2011-01-14 | 2011-08-10 | 三一重型装备有限公司 | 一种掘进机及其截割机构 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US601521A (en) * | 1898-03-29 | John ernst melcher | ||
GB1110850A (en) * | 1966-07-01 | 1968-04-24 | Nikex Nehezipari Kulkere | Improvements in or relating to dredging equipments |
DK169043B1 (da) * | 1991-05-30 | 1994-08-01 | Ernst Benzoni Von Benzon | Jordbor |
US5535836A (en) * | 1994-05-25 | 1996-07-16 | Ventura Petroleum Services , Inc. | Total recovery drill |
US6446365B1 (en) * | 2000-09-15 | 2002-09-10 | Vermeer Manufacturing Company | Nozzle mount for soft excavation |
-
2003
- 2003-05-25 DE DE20308281U patent/DE20308281U1/de not_active Expired - Lifetime
- 2003-05-25 DE DE20308282U patent/DE20308282U1/de not_active Expired - Lifetime
-
2004
- 2004-03-17 EP EP04721120A patent/EP1618258B1/de not_active Expired - Lifetime
- 2004-03-17 DE DE502004004954T patent/DE502004004954D1/de not_active Expired - Lifetime
- 2004-03-17 WO PCT/DE2004/000545 patent/WO2004088049A1/de active IP Right Grant
- 2004-03-17 AT AT04721120T patent/ATE373146T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2004088049A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE20308282U1 (de) | 2003-10-09 |
DE20308281U1 (de) | 2003-09-18 |
EP1618258B1 (de) | 2007-09-12 |
WO2004088049A1 (de) | 2004-10-14 |
ATE373146T1 (de) | 2007-09-15 |
DE502004004954D1 (de) | 2007-10-25 |
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