EP0983405A1 - Impact compactor - Google Patents

Impact compactor

Info

Publication number
EP0983405A1
EP0983405A1 EP98921620A EP98921620A EP0983405A1 EP 0983405 A1 EP0983405 A1 EP 0983405A1 EP 98921620 A EP98921620 A EP 98921620A EP 98921620 A EP98921620 A EP 98921620A EP 0983405 A1 EP0983405 A1 EP 0983405A1
Authority
EP
European Patent Office
Prior art keywords
compactor
drive means
impact
impact compactor
angular velocity
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
Application number
EP98921620A
Other languages
German (de)
French (fr)
Other versions
EP0983405B1 (en
Inventor
Eric Johnstone Cook
Christoffel Avril Mijburgh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compaction Technology Soil Ltd
Original Assignee
Compaction Technology Soil Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Compaction Technology Soil Ltd filed Critical Compaction Technology Soil Ltd
Publication of EP0983405A1 publication Critical patent/EP0983405A1/en
Application granted granted Critical
Publication of EP0983405B1 publication Critical patent/EP0983405B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E01C19/235—Rolling apparatus designed to roll following a path other than essentially linear, e.g. epicycloidal
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/026—Improving by compacting by rolling with rollers usable only for or specially adapted for soil compaction, e.g. sheepsfoot rollers

Definitions

  • THIS invention relates to impact compactors.
  • impact compactor refers to a soil compaction machine which incorporates a rotatable, out-of-round mass that produces a series of impact blows to the soil surface when towed or otherwise driven over that surface.
  • the compactor mass of an impact compactor has multiple sides defining a series of spaced apart salient points on its periphery, each salient point being followed by a compacting face. As the mass is towed or otherwise driven over the soil surface, it rises up on each salient point and then falls forwardly and downwardly as it passes over that point, with the result that the following compacting face applies an impact blow to the soil surface.
  • the action of the mass is therefore to store potential energy as it rises up on each salient point and then to deliver this energy as an impact blow.
  • Impact compactors as described above have been found to work well in practice in achieving high levels of soil compaction, even at substantial depths below the soil surface. Problems may however be encountered in situations where the salient points tend to dig in or slide relative to the soil surface, with the result that the rotational speed of the compactor mass is reduced below normal levels, adding resistance to forward motion of the impact compactor. The problem can be compounded in situations where the impact compactor incorporates a trailing levelling blade to level the compacted soil, because the inclusion of a levelling blade also increases the resistance to forward motion of the impact compactor. . 7
  • an impact compactor comprising at least one out-of-round compactor mass which in use is movable rotationally by primary drive means, at an angular velocity suitable for normal operation, over a soil surface to apply periodic compaction blows to the soil surface, the impact compactor including auxiliary drive means arranged to operate automatically, in response to a reduction of the angular velocity of the, or each, compactor mass below an angular velocity suitable for normal operation, to apply an auxiliary rotary drive to the, or each, compactor mass to restore its angular velocity to that suitable for normal operation.
  • the preferred auxiliary drive means comprises a hydrostatic drive powered by the primary drive means and control means, which is responsive to the angular velocities of the compactor mass and of driven, ground engaging wheels of the primary drive means, for controlling the operation of the hydrostatic drive.
  • the hydrostatic drive conveniently comprises an hydraulic motor powered by an hydraulic pump which is driven in use by the primary drive means, the hydraulic motor being arranged to drive the, or each, compactor mass by chain drive means.
  • the control means may comprise a proportional valve which regulates the flow of hydraulic fluid from the hydraulic pump to the hydraulic motor under the control of a sensor and associated electronics sensitive to the angular velocities of the compactor mass and of driven, ground engaging wheels of the primary drive means.
  • the invention extends to a dual mass impact compactor comprising a pair of spaced apart compactor masses mounted fast on a common shaft for synchronous rotation.
  • the compactor masses are typically mounted on hubs at the ends of the common shaft and the chain drive means comprises a first sprocket driven by the hydrostatic motor, a chain passing about the first sprocket and about a second sprocket fast on an auxiliary shaft and means for driving the hubs off the auxiliary shaft.
  • Such means may conveniently comprise third sprockets fast with the auxiliary shaft and meshing with fourth sprockets fast with the hubs.
  • Figure 1 shows a perspective view of the chain drive and associated components of an auxiliary drive arrangement of an impact compactor according to the present invention, with the chain itself omitted in the interests of clarity of illustration;
  • Figure 2 shows a partially diagrammatic plan view of the chain drive and associated components seen in Figure 1 ;
  • Figure 3 shows a partially diagrammatic side view of the chain driven and associated components seen in Figure 1;
  • Figure 4 diagrammatically illustrates an impact compactor which incorporates the chain drive and associated components of the preceding Figures.
  • FIG 4 diagrammatically illustrates an impact compactor 10 according to the invention.
  • the impact compactor 10 is arranged to be towed by a prime mover in the form of a tractor 12, but it will be understood that the invention is also applicable to impact compactors which are self- propelled, i.e. which incorporate their own prime mover.
  • the impact compactor 10 includes a pair of three-sided compactor masses 14 of conventional design.
  • the masses 14 are mounted fast on a common shaft 16 which forms part of a tube axle assembly 18 seen in plan in Figure 2.
  • the tube axle assembly 18 includes a tube 20 to which a draglink 26 is connected, as illustrated.
  • the draglink 26 is connected by a droplink 28 ( Figure 4) to a wheeled carriage 30 which is hitched to the tractor 12.
  • the towed impact compactor 10 is of conventional design. It will also be appreciated that the traction assembly including the draglink and droplink is resilient in nature to absorb shock loading when the compactor masses are towed over the soil surface and apply impact blows thereto. Reference may be made to the disclosure in, for instance, WO 94/26985 for further details of the traction assembly for the compactor masses. What is not conventional about the impact compactor 10 is the inclusion of an auxiliary drive arrangement. This arrangement includes a positive displacement hydraulic motor 32 mounted on a mounting plate 33 connected to the draglink 26, and a chain drive indicated diagrammatically in Figure 4 by the numeral 35.
  • the chain drive includes a sprocket 34 mounted on the output shaft of the motor 32.
  • a chain 36 represented diagrammatically in Figures 2 and 3 by a broken line, passes around the sprocket 34 and around a sprocket 38 mounted on a shaft 40 which is parallel to and above the shaft 16 and which is supported in inner and outer bearings 42 and 44 carried by the tube 20 of the tube axle assembly 18.
  • the ends of the shaft 40 carry sprockets 46. Further chains 47 pass around the sprockets 46 and around sprockets 48 connected to hubs 50 on which the compactor masses 14 are mounted. The masses 14 are omitted from Figures 1 to 3 in the interests of clarity of illustration.
  • the chain drive 35 also includes chain tensioners 52, 53 and 54 to maintain proper tension in the chains 36 and 47 and an idler sprocket assembly 56.
  • the motor of the tractor motor is indicated with the reference numeral 58 and the transmission with the numeral 60.
  • Driven wheels of the tractor are indicated with the numeral 62.
  • a variable displacement hydraulic pump 64 of conventional swash plate type is driven off the transmission 60.
  • the pump 64 supplies hydraulic fluid to the motor 32 under the control of a proportional valve 66 coupled to a sensor and associated electronic control (not shown) sensitive to the rotational, i.e. angular velocity, of the masses 14 and the driven wheels 62.
  • hydraulic fluid is pumped continuously to the motor 32 by the pump 64.
  • the sensor senses a rotational velocity mismatch between the compactor masses and the driven wheels 62, i.e. the wheels turn faster than the compactor masses
  • the valve 66 under electronic control, increases the rate of flow of hydraulic fluid to the motor 32.
  • the hydraulic motor 32 accordingly exerts additional rotational torque on the compactor masses and accelerates them rotationally so that their rotational velocity catches up with that of the wheels 62.
  • a velocity mismatch may, for instance, occur if one or other of the compactor masses digs into or slips relative to the soil surface rather than rotating about the next salient point, indicated in Figure 4 with the numeral 68, or if the action of a trailing levelling blade, indicated diagrammatically in Figure 4 with the numeral 70, should excessively increase resistance to forward motion of the impact compactor.
  • valve 66 decreases the supply of hydraulic fluid to the motor 32 to normal levels, and normal progress of the compactor masses resumes.
  • the impact compactor 10 has a hydrostatic drive control which automatically supplies extra rotary power to the compactor masses in the event of a velocity mismatch.
  • the sprocket 38 is mounted on the shaft 40 via a unidirectional clutch 72 which transmits rotary motion in one direction only and which freewheels in the other direction.
  • auxiliary drive is hydrostatic in nature.
  • the chain drive could be replaced by any other suitable system including, for instance, independent hydraulic drives at the hubs of the compactor masses.
  • the invention is not limited in scope to use with towed compactor masses and is equally applicable to self-propelled impact compactors incorporating their own prime movers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Architecture (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Fertilizers (AREA)
  • Soil Working Implements (AREA)
  • Road Paving Machines (AREA)

Abstract

The invention concerns an impact compactor (10) which comprises one or more out-of-round compactor masses (14). The masses are moved rotationally over a soil surface, at an angular velocity suitable for normal operation, to apply periodic compaction blows to the soil surface. This is achieved by primary drive means. In the case of a towed impact compactor, the primary drive means is typically a tractor. The impact compactor (10) includes an auxiliary drive which is arranged to operate automatically, in response to a reduction of the angular velocity of the compactor masses below the angular velocity suitable for normal operation, to apply an auxiliary rotary drive that restores their angular velocity.

Description

IMPACT COMPACTOR
BACKGROUND TO THE INVENTION
THIS invention relates to impact compactors.
The term "impact compactor" refers to a soil compaction machine which incorporates a rotatable, out-of-round mass that produces a series of impact blows to the soil surface when towed or otherwise driven over that surface. The compactor mass of an impact compactor has multiple sides defining a series of spaced apart salient points on its periphery, each salient point being followed by a compacting face. As the mass is towed or otherwise driven over the soil surface, it rises up on each salient point and then falls forwardly and downwardly as it passes over that point, with the result that the following compacting face applies an impact blow to the soil surface. The action of the mass is therefore to store potential energy as it rises up on each salient point and then to deliver this energy as an impact blow.
Impact compactors as described above have been found to work well in practice in achieving high levels of soil compaction, even at substantial depths below the soil surface. Problems may however be encountered in situations where the salient points tend to dig in or slide relative to the soil surface, with the result that the rotational speed of the compactor mass is reduced below normal levels, adding resistance to forward motion of the impact compactor. The problem can be compounded in situations where the impact compactor incorporates a trailing levelling blade to level the compacted soil, because the inclusion of a levelling blade also increases the resistance to forward motion of the impact compactor. . 7
SUMMARY OF THE INVENTION
According to the present invention there is provided an impact compactor comprising at least one out-of-round compactor mass which in use is movable rotationally by primary drive means, at an angular velocity suitable for normal operation, over a soil surface to apply periodic compaction blows to the soil surface, the impact compactor including auxiliary drive means arranged to operate automatically, in response to a reduction of the angular velocity of the, or each, compactor mass below an angular velocity suitable for normal operation, to apply an auxiliary rotary drive to the, or each, compactor mass to restore its angular velocity to that suitable for normal operation.
Although other types of auxiliary drive are within the scope of the invention, the preferred auxiliary drive means comprises a hydrostatic drive powered by the primary drive means and control means, which is responsive to the angular velocities of the compactor mass and of driven, ground engaging wheels of the primary drive means, for controlling the operation of the hydrostatic drive. The hydrostatic drive conveniently comprises an hydraulic motor powered by an hydraulic pump which is driven in use by the primary drive means, the hydraulic motor being arranged to drive the, or each, compactor mass by chain drive means. In this arrangement, the control means may comprise a proportional valve which regulates the flow of hydraulic fluid from the hydraulic pump to the hydraulic motor under the control of a sensor and associated electronics sensitive to the angular velocities of the compactor mass and of driven, ground engaging wheels of the primary drive means. The invention extends to a dual mass impact compactor comprising a pair of spaced apart compactor masses mounted fast on a common shaft for synchronous rotation. Tn this case, the compactor masses are typically mounted on hubs at the ends of the common shaft and the chain drive means comprises a first sprocket driven by the hydrostatic motor, a chain passing about the first sprocket and about a second sprocket fast on an auxiliary shaft and means for driving the hubs off the auxiliary shaft. Such means may conveniently comprise third sprockets fast with the auxiliary shaft and meshing with fourth sprockets fast with the hubs.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings in which:
Figure 1 shows a perspective view of the chain drive and associated components of an auxiliary drive arrangement of an impact compactor according to the present invention, with the chain itself omitted in the interests of clarity of illustration;
Figure 2 shows a partially diagrammatic plan view of the chain drive and associated components seen in Figure 1 ;
Figure 3 shows a partially diagrammatic side view of the chain driven and associated components seen in Figure 1; Figure 4 diagrammatically illustrates an impact compactor which incorporates the chain drive and associated components of the preceding Figures.
DESCRIPTION OF A PRFFFRRFD EMBODIMENT
Figure 4 diagrammatically illustrates an impact compactor 10 according to the invention. In this case, the impact compactor 10 is arranged to be towed by a prime mover in the form of a tractor 12, but it will be understood that the invention is also applicable to impact compactors which are self- propelled, i.e. which incorporate their own prime mover.
In this embodiment, the impact compactor 10 includes a pair of three-sided compactor masses 14 of conventional design. The masses 14 are mounted fast on a common shaft 16 which forms part of a tube axle assembly 18 seen in plan in Figure 2. The tube axle assembly 18 includes a tube 20 to which a draglink 26 is connected, as illustrated. As shown diagrammatically in Figure 4, the draglink 26 is connected by a droplink 28 (Figure 4) to a wheeled carriage 30 which is hitched to the tractor 12.
Those skilled in the art of impact compaction will recognise that the towed impact compactor 10, as thus far described, is of conventional design. It will also be appreciated that the traction assembly including the draglink and droplink is resilient in nature to absorb shock loading when the compactor masses are towed over the soil surface and apply impact blows thereto. Reference may be made to the disclosure in, for instance, WO 94/26985 for further details of the traction assembly for the compactor masses. What is not conventional about the impact compactor 10 is the inclusion of an auxiliary drive arrangement. This arrangement includes a positive displacement hydraulic motor 32 mounted on a mounting plate 33 connected to the draglink 26, and a chain drive indicated diagrammatically in Figure 4 by the numeral 35. Referring to the more detailed views of Figures 1 to 3, the chain drive includes a sprocket 34 mounted on the output shaft of the motor 32. A chain 36, represented diagrammatically in Figures 2 and 3 by a broken line, passes around the sprocket 34 and around a sprocket 38 mounted on a shaft 40 which is parallel to and above the shaft 16 and which is supported in inner and outer bearings 42 and 44 carried by the tube 20 of the tube axle assembly 18.
The ends of the shaft 40 carry sprockets 46. Further chains 47 pass around the sprockets 46 and around sprockets 48 connected to hubs 50 on which the compactor masses 14 are mounted. The masses 14 are omitted from Figures 1 to 3 in the interests of clarity of illustration. The chain drive 35 also includes chain tensioners 52, 53 and 54 to maintain proper tension in the chains 36 and 47 and an idler sprocket assembly 56.
Referring again to Figure 4, the motor of the tractor motor is indicated with the reference numeral 58 and the transmission with the numeral 60. Driven wheels of the tractor are indicated with the numeral 62.
A variable displacement hydraulic pump 64 of conventional swash plate type is driven off the transmission 60. The pump 64 supplies hydraulic fluid to the motor 32 under the control of a proportional valve 66 coupled to a sensor and associated electronic control (not shown) sensitive to the rotational, i.e. angular velocity, of the masses 14 and the driven wheels 62. In normal operation, hydraulic fluid is pumped continuously to the motor 32 by the pump 64. If the sensor senses a rotational velocity mismatch between the compactor masses and the driven wheels 62, i.e. the wheels turn faster than the compactor masses, the valve 66, under electronic control, increases the rate of flow of hydraulic fluid to the motor 32. Via the chain drive mechanism, the hydraulic motor 32 accordingly exerts additional rotational torque on the compactor masses and accelerates them rotationally so that their rotational velocity catches up with that of the wheels 62.
A velocity mismatch may, for instance, occur if one or other of the compactor masses digs into or slips relative to the soil surface rather than rotating about the next salient point, indicated in Figure 4 with the numeral 68, or if the action of a trailing levelling blade, indicated diagrammatically in Figure 4 with the numeral 70, should excessively increase resistance to forward motion of the impact compactor.
As soon as the velocities have been matched again, the valve 66 decreases the supply of hydraulic fluid to the motor 32 to normal levels, and normal progress of the compactor masses resumes.
It will thus be appreciated that the impact compactor 10 has a hydrostatic drive control which automatically supplies extra rotary power to the compactor masses in the event of a velocity mismatch.
The sprocket 38 is mounted on the shaft 40 via a unidirectional clutch 72 which transmits rotary motion in one direction only and which freewheels in the other direction. With this feature, it is not possible for the compactor masses to drive the tractor should their rotational speed exceed that of the wheels 62. This may, for instance, happen when the masses fall forwardly as they pass over the salient points.
In the above description the auxiliary drive is hydrostatic in nature. However it should be appreciated that the principles of the invention are equally applicable to other forms of auxiliary drive, including purely mechanical or electro-mechanical arrangements. The chain drive could be replaced by any other suitable system including, for instance, independent hydraulic drives at the hubs of the compactor masses. It should also be noted that the invention is not limited in scope to use with towed compactor masses and is equally applicable to self-propelled impact compactors incorporating their own prime movers.

Claims

1.
An impact compactor comprising at least one out-of-round compactor mass which in use is movable rotationally by primary drive means, at an angular velocity suitable for normal operation, over a soil surface to apply periodic compaction blows to the soil surface, the impact compactor including auxiliary drive means arranged to operate automatically, in response to a reduction of the angular velocity of the, or each, compactor mass below an angular velocity suitable for normal operation, to apply an auxiliary rotary drive to the, or each, compactor mass to restore its angular velocity to that suitable for normal operation.
2.
An impact compactor according to claim 1 wherein the auxiliary drive means comprises a hydrostatic drive powered by the primary drive means and control means, which is responsive to the angular velocities of the compactor mass and of driven, ground engaging wheels of the primary drive means, for controlling the operation of the hydrostatic drive.
3.
An impact compactor according to claim 2 wherein the hydrostatic drive comprises an hydraulic motor powered by an hydraulic pump which is driven in use by the primary drive means, the hydraulic motor being arranged to drive the, or each, compactor mass by chain drive means.
4.
An impact compactor according to claim 3 wherein the control means comprises a proportional valve which regulates the flow of hydraulic fluid from the hydraulic pump to the hydraulic motor under the control of a sensor and associated electronics sensitive to the angular velocities of the compactor mass and of driven, ground engaging wheels of the primary drive means.
5.
An impact compactor according to either one of claims 3 or 4 comprising a pair of spaced apart compactor masses mounted fast on a common shaft for synchronous rotation.
6.
An impact compactor according to claim 5 wherem the compactor masses are mounted on hubs at the ends of the common shaft and the chain drive means comprises a first sprocket driven by the hydrostatic motor, a chain passing about the first sprocket and about a second sprocket fast on an auxiliary shaft and means for driving the hubs off the auxiliary shaft.
7.
An impact compactor according to claim 6 wherein the means for driving the hubs off the auxiliary shaft comprises third sprockets fast with the auxiliary shaft and meshing with fourth sprockets fast with the hubs.
8.
An impact compactor according to any one of the preceding claims wherein the impact compactor is hitchable in use to a tractor which serves as the primary drive means.
9.
An impact compactor according to any one of claims 1 to 7 wherein the impact compactor incorporates its own primary drive means.
EP98921620A 1997-05-15 1998-05-15 Impact compactor Expired - Lifetime EP0983405B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA9704208 1997-05-15
ZA974208 1997-05-15
PCT/GB1998/001400 WO1998051866A1 (en) 1997-05-15 1998-05-15 Impact compactor

Publications (2)

Publication Number Publication Date
EP0983405A1 true EP0983405A1 (en) 2000-03-08
EP0983405B1 EP0983405B1 (en) 2002-03-27

Family

ID=25586406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98921620A Expired - Lifetime EP0983405B1 (en) 1997-05-15 1998-05-15 Impact compactor

Country Status (9)

Country Link
EP (1) EP0983405B1 (en)
JP (1) JP3773543B2 (en)
CN (1) CN1120270C (en)
AT (1) ATE215152T1 (en)
AU (1) AU732609B2 (en)
CA (1) CA2290465C (en)
DE (1) DE69804443T2 (en)
ES (1) ES2175709T3 (en)
WO (1) WO1998051866A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6843615B1 (en) 1998-11-09 2005-01-18 Compaction Technology (Soil) Limited Compaction roller
CN103485261B (en) * 2013-10-19 2015-06-03 浦江县杰浩进出口有限公司 Pavement reinforcing equipment
EP3353351B1 (en) * 2015-09-25 2020-04-29 Roger Arnold Stromsoe Impact compactor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9310145D0 (en) * 1993-05-17 1993-06-30 Compaction Tech Soil Ltd Soil compaction
GB9422415D0 (en) * 1994-11-07 1995-01-04 Compaction Tech Soil Ltd Compaction of soil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9851866A1 *

Also Published As

Publication number Publication date
JP2001525024A (en) 2001-12-04
DE69804443T2 (en) 2003-01-02
JP3773543B2 (en) 2006-05-10
WO1998051866A1 (en) 1998-11-19
AU7440798A (en) 1998-12-08
ATE215152T1 (en) 2002-04-15
CA2290465C (en) 2007-08-07
CN1261940A (en) 2000-08-02
ES2175709T3 (en) 2002-11-16
CN1120270C (en) 2003-09-03
AU732609B2 (en) 2001-04-26
DE69804443D1 (en) 2002-05-02
EP0983405B1 (en) 2002-03-27
CA2290465A1 (en) 1998-11-19

Similar Documents

Publication Publication Date Title
US2708800A (en) Loader-crowding drive
US5479728A (en) Apparatus for backfilling and tamping a trench
US4782906A (en) Multi-wheel steerable rigid frame power module vehicle
US4964753A (en) Three roll compactor
CA1104983A (en) Feeder crusher
EP0983405B1 (en) Impact compactor
EP0067018B1 (en) Material working machines
US3057088A (en) Portable trenching device
US3208165A (en) Earth scraper with hydraulically operated conveyor
US3738031A (en) Resiliently mounted elevator drive housing
US20090032314A1 (en) Drive system for a machine
US4896442A (en) Trencher apparatus
US4030217A (en) Two wheel excavating and loading system
US3222802A (en) Self-propelled vehicle and mounting for tool or implement
US20050014425A1 (en) Drive system for amphibious equipment
US3526290A (en) Traction device for vehicles
GB1601239A (en) Vehicles with vehicle and auxiliary drive means
US4038763A (en) Orbital trench forming apparatus
WO2002099199A1 (en) Apparatus and method for controlling eccentric assemblies
GB2219562A (en) Auxillary driving means in road-sweeping vehicle
US5320448A (en) Drive mechanism for a vibratory compactor
US3961429A (en) Excavating device
US3828560A (en) Self-propelled machine with a driven work-performing member
US1553833A (en) Excavating machine
De Haan Chainline Trenchers

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19991027

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE ES FR GB IT NL SE

RTI1 Title (correction)

Free format text: IMPACT COMPACTOR

RTI1 Title (correction)

Free format text: IMPACT COMPACTOR

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 20010713

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE ES FR GB IT NL SE

REF Corresponds to:

Ref document number: 215152

Country of ref document: AT

Date of ref document: 20020415

Kind code of ref document: T

REF Corresponds to:

Ref document number: 69804443

Country of ref document: DE

Date of ref document: 20020502

ET Fr: translation filed
ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2175709

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20021230

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20070503

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20070508

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070510

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20070511

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20070621

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070509

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070507

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20070709

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070510

Year of fee payment: 10

BERE Be: lapsed

Owner name: *COMPACTION TECHNOLOGY (SOIL) LTD

Effective date: 20080531

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20080515

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080515

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20090119

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080602

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080515

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20080516

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080515

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080516

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080516