US3783701A - Vibrator - Google Patents
Vibrator Download PDFInfo
- Publication number
- US3783701A US3783701A US00279170A US3783701DA US3783701A US 3783701 A US3783701 A US 3783701A US 00279170 A US00279170 A US 00279170A US 3783701D A US3783701D A US 3783701DA US 3783701 A US3783701 A US 3783701A
- Authority
- US
- United States
- Prior art keywords
- channel
- mass
- passage
- wall
- abutment
- 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.)
- Expired - Lifetime
Links
Images
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
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
- E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
- B06B1/186—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with rotary unbalanced masses
-
- 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
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
- E02D3/074—Vibrating apparatus operating with systems involving rotary unbalanced masses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18544—Rotary to gyratory
- Y10T74/18552—Unbalanced weight
Definitions
- VIBRATOR Inventors: Werner Steprath, Gohr; Manfred Birkholz, Schoenmaschinen, both of Germany [73] Assignee: Maschinenfabrilt Buckau R. Wolf Aktiengesellschaft, Grevenbroich, Germany [22] Filed: Aug. 9, 1972 21 Appl. NO.Z 279,170
- Vibrating rollers for smoothing and/or compacting of soil .or of street and other surfaces make use of the vibrators of the art.
- These vibratorsv are provided with one or more imbalanced weights or masses, which imbalance causes vibrations to be produced when the vibrator is in motion.
- the vibrator may be mounted on a shaft or other device which rotates continuously, thereby providing continuous vibrations.
- the energizing force, that is the force responsible for the vibrations, is the weight imbalance. Since the vibrations are continuous, depressions are formed in the surface during a change in the direction of travel of the roller. This is due to the fact that the vibrations are concentrated on one location for the time which is required to stop movement of the roller and to reverse its direction.
- premature stoppage of the vibrator may impair the cohesiveness of the surface. It is irrevelant, in this regard, whether the roller has one or more rolling wheels and whether a vibrator is provided within each rolling wheel or only .within the driving roller wheel frame. It is to be noted that thesmaller the imbalance the smaller the energizing force and when no imbalance exists no energizing force exists.
- an object of the present invention to provide a vibrator wherein the energizing force can be readily cancelled for a requisite time, e.g. the time necessary to reverse the direction of motion of a compacting roller with which it is associated.
- a further object of the present invention is to provide a vibrator wherein cancellation of the energizing force can occur while the roller with which it is associated,
- An additional object of the present invention is to provide a vibrator which is inexpensive to produce.
- Yet a further object of the present invention is to provide a vibrator which does not require complicated controls.
- Still one more object of the present invention is to provide a vibrator the operation of which will not result in damage or impairment of surfaces to be smoothed, compacted or otherwise finished with the aid of the vibrator.
- v v 7 Basically, then, the invention concerns itself with the problem of creating a continuously adjustable vibrator for apparatus utilizing vibrating rollers, vibrating plates or similar devices, wherein the energizing force resulting from the imbalance of angular offset masses, may be changed by the application of the lowest possible displacement forces. It is further desired to simultaneously make use of the restoring forces arising in operation of the novel apparatus.
- one feature of the invention resides in an apparatus for producing vibrations, having a combination comprising wall means defining an annular channel and at least one mass accommodated in and movable circumferentially of the channel.
- the combination further includes moving means for effecting movement of the mass circumferentially of the channel to respect locations therein. Abutment means are provided in the channel for impeding movement of the mass in excess of a predetermined portion of arc.
- the invention thus pertains to a vibrator for use in vibrating apparatus utilizing vibrating plates, vibrating rollers or similar devices, wherein one or more movable masses are accommodated within an annular channel which is concentric with a shaft.
- the above-mentioned problem is solved, according to the present invention, by using masses of cylindrical form which are located in a rotationally symmetrical channel.
- the channel is provided with at least one abutment element for the cylindrical masses, and is connected to a source of pressure fluid so that such fluid can be admitted into the channel.
- This vibrator operates as an overcritical revolving body and is designed to rotate about its principal inertial axis.
- the cylindrical masses With the help of the pressure fluid and, if nec essary, the abutment elements, the cylindrical masses are set at such relative angular positions within the annular channel that they provide the imbalance neces sary to produce the desired vibrations. If the flow of pressure fluid is interrupted, then, as a result of the inherent restoring forces, the cylindrical masses move circumferentially and almost friction-free, along the inner surface of the outer wall banding the annular channel. This movement continues until the principal inertial axis is again coincident with the axis of symmetry of the vibrator so that the vibrator is once more balanced, i.e., so that no more imbalance exists. It is thus possible, by simplest means, to cancel the energizing force in a fraction of a second.
- the displacement forces for the masses may be held to very low values and, in addition, the restoring forces inherently arising from the relative angular displacement of the masses are put to use.
- a vibrator according to the invention can, for example, be used in a vibrating-plate compactor for an application where different varieties of surfaces are to be compacted or finished and where, accordingly, rapid displacement of the masses is necessary.
- Another feature of the invention lies in a construction wherein the channel is formed from a pair of discs connected to and surrounding a shaft, and a circumferential wall accommodated between the discs and connected to their outer peripheries.
- an annular channel or rectangular cross section is provided which, on technical production grounds, is simple to manufacture.
- a channel of circular cross section with spherical masses accommodated therein, should be used.
- a channel of circular cross section is so much more expensive to produce that the technical advantages of using such a channel are not worth the cost.
- the abutment elements in the channel may be in the form of bolts extending at least partly across the channel, or dividing walls.
- a particularly advantageous configuration provides for two abutment elements which are located diametrically opposite each other. In such a case, when two masses of equal weight are accommodated within the channel, no imbalance can be produced when the vibrator first begins to rotate. The reason for this is that each of the masses initially abuts against one of the abutment elements, thereby causing the two masses to be retained in positions diametrically opposite each other, with the result that the masses balance one another.
- a particularly simple construction is obtained if'one of two cylindrical masses is fastened in the channel by means of one of the abutment elements.
- the second element is then so mounted with the channel, i.e., diametrically opposite the first element, that the second cylindrical mass has a range of travel of 180 of arc circumferentially of the channel. This produces a rotation of the imbalance vector relative to the revolving vibrator during displacement of the mass.
- Another feature of the invention lies in a construction wherein two dividing walls, each constituting an abutment and being located diametrically opposite one another, divide the channel into two portions each of which accommodates one cylindrical mass.
- the imbalance vector remains stationary relative to the revolving vibrator during displacement of the masses.
- the channel will normally always be filled with pressure fluid, it is necessary, in order to displace the masses, to provide means for producing pressure within the channel.
- the shaft on which the channel is mounted is provided with an inlet and an outlet which communicate with the channel on the one hand and are connected to a source of pressure fluid on the other hand.
- the inlet and outlet must communicate with the channel on opposite sides of the fastened mass, as seen in circumferential direction of the channel.
- both dividing walls are provided with at least one transverse passage, each of which communicates with the channel on both sides of the respective dividing wall.
- FIG. 1 shows a vibrator according to the present invention, in a cross-sectional view
- FIG. 2 is an axial section of the embodiment illustrated in FIG. 1, and
- FIG. 3 shows a further embodiment of the invention in a view similar to FIG. 1.
- a shaft 1 is provided with a hub2.
- a pair of discs 3, 4 are connected to and surround the shaft 1 at the axial ends of the hub 2; together with a circumferential wall 5 and the hub 2 these discs 3 and 4 form an annular channel 6 having a rectangular cross section.
- the diameter of the discs 3, 4 is greater than that of the hub 2 and the circumferential wall 5 is fluid-tightly connected to the outer peripheries of the discs 3, 4.
- the channel 6 accommodates two masses 7, 8 which are in the form of cylinders or rolls and whose length is slightly less than the dimension of the channel 6 in axial direction of the shaft 1.
- the mass 7 is fastened in the channel 6 by a diagrammatically illustrated bolt or analogous means 9a.
- the second mass 8 is free to move circumferentially of the channel 6.
- a bolt 9, fast with the cylindrical'hub 2 and extending at least partly across the channel 6, is so located that the mass 8 has a range of travel of 180 of arc circumferentially of the channel 6 between the bolt 9 and the fastened mass 7. Whenever the vibrator is at rest, the mass 8 will be located at the lowest point of channel 6.
- an inlet passage or bore 12 and an outlet passage or bore 13 are provided in the shaft 1 and hub 2.
- the source of pressure fluid 18 may be or may include a reversible pump; such pumps are known per se.
- the center of rotation of the vibrator may shift from the middle of the vibrator towards the position of the center of mass of the masses 7, 8.
- the centrifugal forces of the mass 8 no longer act perpendicularly to the circumferential wall 5 and a restoring force arises which is due to the weight of the mass 8.
- the restoring force acts in such a manner that the mass 8 moves circumferentially away from the mass 7 and continues to move until it reaches a position in which the vibrator is again balanced.
- the mass 8 moves circumferentially of the channel 6 until the masses 7, 8 are again diametrically opposite each other and no imbalance exists.
- the restoring force is approximately proportional to the energizing force.
- the hydraulic pressure is approximately proportional to the energizing force.
- the control range that is, the range of pressure necessary to control the m0- tion of the mass 8, is of the order of magnitude of 0-2 atmospheres in excess of atmospheric pressure.
- this return movement of the mass 8 occurs in a fraction of a second; it can be further accelerated by reversing the flow of the pressure fluid (e.g. by reversing the operation of the reversible pump).
- FIG. 3 shows another embodiment of the invention, it can be seen that here the channel 6 is divided into two portions or compartments 6a, 6b by means of the dividing walls l0, 11. Each portion 6a, 6b accommodates one of the movable cylindrical masses 7, 8. When the vibrator begins to rotate,
- dividing walls 10, 11 are located diametn'cally opposite each other, no imbalance exists.
- a stream of pressure fluid is made to flow through the inlet bore 12.
- the pressure fluid exists from the inlet bore 12 into the transverse passage 14 provided in the dividing wall 10.
- the transverse passage 14 communicates with the portions 6a, 6b at the respective opposite sides of the dividing wall 10.
- the pressure fluid may flow .into the portions 6a, 6b, thereby allowing the portions 6a, 6b to become filled with this fluid.
- a transverse passage 15 is further provided in the dividing wall 11.
- the transverse passage 15 also communicates with the portions 6a, 6b at the respective opposite sides of the dividing wall 11.
- the pressure fluid may flow from the portions 6a,'6b into the transverse passage 15.
- the pressure fluid exits from the transverse passage 15 into the outlet bore 13.
- the inlet bore 12 and the outlet bore 13 are connected to a source of pressure fluid 18 as shown in FIG. 2 and asexplained earlier.
- the source of pressure fluid may include a reversible pump.
- the source of pressure fluid may include a reversible pump.
- the stream of pressure fluid through the transverse passage 14 displaces the mass 8 until it, also, abuts against the dividing wall 11 thereby producing the maximum imbalance.
- the masses 7, 8 move away from each other until they once again lie diametrically opposite one another, thus eliminating the imbalance.
- Both of the bores 12, 13 of FIGS. ll-3 may be connected to the same source of pressure fluid 18, as shown in FIG. 2.
- the source 18 may include, for example, reversible hydraulic or pneumatic means for conveying the pressure fluid from the source 18 into the bores 12, 13.
- the direction of flow of the pressure fluid can be reversed.
- FIG. .3 as an example, it is then possible to convey the pressure fluid into the portions 6a, 6b through either one of the trans verse passages 14, 15 and to let it exit from the portions 6a, 6b through either one of the transverse passages 15, 14.
- the masses 7, 8 accommodated in the portions 6a,06b respectively may be subjected to pressure on either side.
- a combination comprising wall means defining an annular channel; at least one mass accommodated in and movable circumferentially of said channel; moving means for effecting movement of said mass circumferentially of said channel to respective locations therein; abutment means in said channel for impeding said movement of said mass in excess of a predetermined portion of arc; and a source of pressure fluid, and conveying means for conveying said fluid from said source into said channel.
- abutment means comprises abutment elements fast with said wall means, extending at least partly across said channel and dividing said channel into portions.
- said wall means comprises a mounting portion mounting said wall means for rotation about an axis; and wherein said channel surrounds said axis.
- said mounting portion comprises shaft, and a hub provided on said shaft and having two axial ends; and wherein said wall means comprises a pair of discs each surrounding said shaft adjacent one of said axial ends and having a diameter greater than that of said hub, and a circumferential wall connected with the outer peripheries of said discs and defining with the latter and with said hub said annular channel.
- abutment means comprises tow abutment elements provided at diameterically opposite locations of said channel.
- said abutment means comprises at least one bolt fast with said wall means and extending at least partly across said channel.
- said abutment means comprises two dividing walls fast with said wall means, extending at least partly across said channel and dividing said channel into two portions.
- said conveying means comprises at least one inlet and one outlet passage provided in said shaft, and connecting means connecting said passage with said source; and further comprising at least one transverse passage provided in each of said dividing walls and connecting means connecting said inlet passage with said transverse passage of one of said dividing walls and said outlet passage with said transverse passage of the other of said dividing walls.
- each said transverse passage communicates with said channel on both sides of the respective dividing wall.
- said conveying means comprises at least one inlet and one outlet passage provided in said shaft, and connecting means connecting said passage with said source.
- said conveying means comprises at least one inlet and one outlet passage provided in said shaft, and connecting means connecting said passage with said source; and wherein said passages communicate with said channel on opposite sides of said one mass.
- Claim 1 line 9, "and", first occurrence, should read said moving means including 1 Claim 7, line 1, "11” should read l Claim 10, line 1, "11” should read l line 2, “tow” should read two line 3, "diameterically” should read diametrically Claim 13, line 3, cancel "provided in said shaft”; l5 line 1, "11” should read 9 Claim 18, line 1, "1” should read 3 line S, cancel “provided in said shaft”; line 4, "passage” should read passages Signed and sealed this 29th day of October 1974.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Road Paving Machines (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2140006 | 1971-08-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3783701A true US3783701A (en) | 1974-01-08 |
Family
ID=5816339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00279170A Expired - Lifetime US3783701A (en) | 1971-08-10 | 1972-08-09 | Vibrator |
Country Status (8)
Country | Link |
---|---|
US (1) | US3783701A (ja) |
JP (1) | JPS4835467A (ja) |
AT (1) | AT319996B (ja) |
CA (1) | CA962093A (ja) |
CH (1) | CH537218A (ja) |
DE (1) | DE2140006B1 (ja) |
FR (1) | FR2149942A5 (ja) |
GB (1) | GB1368839A (ja) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4176983A (en) * | 1978-07-17 | 1979-12-04 | Ingersoll-Rand Company | Variable eccentric device |
US4262549A (en) * | 1978-05-10 | 1981-04-21 | Schwellenbach Donald D | Variable mechanical vibrator |
US20040200299A1 (en) * | 2003-04-10 | 2004-10-14 | Niemi Eric A. | Shift rod piston seal arrangement for a vibratory plate compactor |
US20060165488A1 (en) * | 2005-01-27 | 2006-07-27 | Keith Morris | Hand held tamping device |
CN100532722C (zh) * | 2004-07-31 | 2009-08-26 | 福州大学 | 压路机激振和激振方向调整机构 |
US20150211195A1 (en) * | 2012-02-01 | 2015-07-30 | Hamm Ag | Compactor roller for a soil compactor |
US9255365B1 (en) * | 2014-07-24 | 2016-02-09 | Caterpillar Paving Products Inc. | Compaction system |
US10166573B2 (en) * | 2015-12-28 | 2019-01-01 | Volvo Construction Equipment Ab | Eccentric assembly for a vibration compacting machine |
US11542770B2 (en) * | 2017-10-24 | 2023-01-03 | Halliburton Energy Services, Inc. | Agitator for use with a drill string |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55135549A (en) * | 1979-04-11 | 1980-10-22 | Yamazaki Seipan Kk | Method of making the base dough of japanese unbaked cake using new powder as the major starting material |
SE443591B (sv) * | 1981-10-28 | 1986-03-03 | Dynapac Ab | Anordning for kontinuerlig omstellning av vibrationsamplituden hos ett roterbart excenterelement |
JPS5966846A (ja) * | 1982-10-05 | 1984-04-16 | Eisai Co Ltd | リゾチ−ム含有食品 |
DE3523955A1 (de) * | 1985-07-04 | 1987-01-08 | Fritz Prof Dr Rostock | Vibratoraggregat |
DE19547698C2 (de) * | 1995-12-20 | 2000-08-17 | Wirtgen Gmbh | Vorrichtung und Verfahren zum Abfräsen von harten Oberflächen, insbesondere von Straßenbelägen |
DE102020132973A1 (de) * | 2020-12-10 | 2022-06-15 | Hamm Ag | Verdichterwalze für einen Bodenverdichter |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2496291A (en) * | 1947-01-03 | 1950-02-07 | High Rie | Pneumatic dual rotary vibrator |
US2703490A (en) * | 1952-01-22 | 1955-03-08 | William C Brueggeman | Pressure controlled vibration producing machine |
US2747418A (en) * | 1954-10-07 | 1956-05-29 | Goodman Mfg Co | Gyratory device |
US2793009A (en) * | 1954-12-02 | 1957-05-21 | Edwin F Peterson | Machine vibrator |
US2829527A (en) * | 1956-05-10 | 1958-04-08 | Burritt G Fleming | Power operated vibrators |
US2831353A (en) * | 1955-09-06 | 1958-04-22 | Int Research & Dev Co Ltd | Force producing apparatus |
-
1971
- 1971-08-10 DE DE2140006A patent/DE2140006B1/de active Pending
-
1972
- 1972-06-28 CH CH966272A patent/CH537218A/de not_active IP Right Cessation
- 1972-06-28 AT AT558672A patent/AT319996B/de not_active IP Right Cessation
- 1972-08-02 GB GB3616172A patent/GB1368839A/en not_active Expired
- 1972-08-07 FR FR7228388A patent/FR2149942A5/fr not_active Expired
- 1972-08-09 CA CA148,993A patent/CA962093A/en not_active Expired
- 1972-08-09 US US00279170A patent/US3783701A/en not_active Expired - Lifetime
- 1972-08-10 JP JP47079567A patent/JPS4835467A/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2496291A (en) * | 1947-01-03 | 1950-02-07 | High Rie | Pneumatic dual rotary vibrator |
US2703490A (en) * | 1952-01-22 | 1955-03-08 | William C Brueggeman | Pressure controlled vibration producing machine |
US2747418A (en) * | 1954-10-07 | 1956-05-29 | Goodman Mfg Co | Gyratory device |
US2793009A (en) * | 1954-12-02 | 1957-05-21 | Edwin F Peterson | Machine vibrator |
US2831353A (en) * | 1955-09-06 | 1958-04-22 | Int Research & Dev Co Ltd | Force producing apparatus |
US2829527A (en) * | 1956-05-10 | 1958-04-08 | Burritt G Fleming | Power operated vibrators |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4262549A (en) * | 1978-05-10 | 1981-04-21 | Schwellenbach Donald D | Variable mechanical vibrator |
US4176983A (en) * | 1978-07-17 | 1979-12-04 | Ingersoll-Rand Company | Variable eccentric device |
US20040200299A1 (en) * | 2003-04-10 | 2004-10-14 | Niemi Eric A. | Shift rod piston seal arrangement for a vibratory plate compactor |
US7165469B2 (en) * | 2003-04-10 | 2007-01-23 | M-B-W Inc. | Shift rod piston seal arrangement for a vibratory plate compactor |
CN100532722C (zh) * | 2004-07-31 | 2009-08-26 | 福州大学 | 压路机激振和激振方向调整机构 |
US20060165488A1 (en) * | 2005-01-27 | 2006-07-27 | Keith Morris | Hand held tamping device |
US20150211195A1 (en) * | 2012-02-01 | 2015-07-30 | Hamm Ag | Compactor roller for a soil compactor |
US9284696B2 (en) * | 2012-02-01 | 2016-03-15 | Hamm Ag | Compactor roller for a soil compactor |
US9255365B1 (en) * | 2014-07-24 | 2016-02-09 | Caterpillar Paving Products Inc. | Compaction system |
US10166573B2 (en) * | 2015-12-28 | 2019-01-01 | Volvo Construction Equipment Ab | Eccentric assembly for a vibration compacting machine |
US11542770B2 (en) * | 2017-10-24 | 2023-01-03 | Halliburton Energy Services, Inc. | Agitator for use with a drill string |
Also Published As
Publication number | Publication date |
---|---|
CH537218A (de) | 1973-05-31 |
FR2149942A5 (ja) | 1973-03-30 |
DE2140006B1 (de) | 1972-05-25 |
JPS4835467A (ja) | 1973-05-24 |
AT319996B (de) | 1975-01-27 |
CA962093A (en) | 1975-02-04 |
GB1368839A (en) | 1974-10-02 |
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