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Publication numberUS3811787 A
Publication typeGrant
Publication dateMay 21, 1974
Filing dateAug 7, 1972
Priority dateAug 7, 1972
Also published asCA981083A, CA981083A1
Publication numberUS 3811787 A, US 3811787A, US-A-3811787, US3811787 A, US3811787A
InventorsBeaty R, Martenson E
Original AssigneeBarber Greene Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Screed attached grade reference mechanism
US 3811787 A
Abstract
A mobile grade reference device is connected to the paving machine for travel therewith, such grade reference device being disposed forwardly of the screed and inboard of the lateral extremities thereof. A longitudinally extending grade reference beam has the forward end thereof pivotally mounted to the mobile grade reference device at the longitudinal midpoint of the latter, such pivot point being located rearwardly of the pivot axes of the draft arms engaged with the screed. The rearward end of this beam is pivotally mounted to the screed. The control system for raising and lowering the pivot axes of the draft arms has the sensor thereof supported from the screed adjacent to and forward of the forward portion of the screed; this sensor is engaged by a stringline mounted on said beam.
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United StatesPatent .1191 Beauty et 5 i [54] sCREED ATTACHED GRADE REFERENCE MECHANISM [75] Inventors: RonaldW. Beaty, Aurora; Earl D. Martenson, North Aurora, both of May 21, 1974' Primary ExamineF-Marion Parsons, Jr. Attorney, Agent, or Firm--.McDougall, Hersh & Scott [57] ABSTRACT screed. The rearward end of this beam is pivotally mounted to the screed. The control system for raising and lowering the pivot axes of the draft arms has the sensor thereof supported from the screed adjacent to and forward of the forward portion of the screed; this sensor is engaged by a stringline mounted on said 12 Claims, 8 Drawing Figures 9/l966 3,285,148 ll/1966 3,466,990 9/1969 3,519,770 7/1970 3,618,434 1171971 Long ..404/11s FOREIGN PATENTS 0R APPLICATIONS -41,773 ll/l965 Germany ..404 s4 SHEEI 1 BF 2 FIG .45

PATENTEDHAYN I974 PATENTED m 2 1 m4 SHEEI 2 OF 2 SCREED A'I'IIACHED GRADE REFERENCE MECHANISM BACKGROUND OF THE INVENTION 1. Field of the Invention The field of the present invention relates to improvements in road finishing machines or-pavers of the type which lay and finish bituminous or like paving materials along a'roadwa-y or subgrade. More particularly, the present invention relates to a grade reference mechanism forming part of the automatic screed control system for such a paving machine.

As is known to those skilled in the art, an automatic screed control system for a paver includes'a feeler or sensor which engages an external reference wire or stringline. This-external reference establishes areference plane independently of the paving machine. The feeler or sensor activates a control system, usually electrically or hydraulically operated, to vary the screed angle of attack by raising or lowering the pivot points of the draftarms which mount the screed or by pivoting the screed with respect to the draft arms. Such a system permits the paving machine to lay a pavement with a ment. However, this type of grade reference is not the.

most desirable as erection of the line or wire is expensive, time consuming and constitutes an inconvenience to the ready movement of workmen and vehicles at the job site.

When a.curb or gutter extends along the roadway,

the upper surface thereof may be used as the external grade reference. Of course, whether this grade reference may be used will depend on whether such a curb or gutter is available along the particular roadway to be paved. The use of this form of external reference is obviously quite limited.

A preferred way-of establishing the necessary grade reference datum for an automatic screed control system includes the use of a mobile grade reference device which supports thestringline engaged by the sensor of the control system. This mobile grade reference device is towed by the paving machine. Such a mobile grade reference device is most often constituted by a beam, ski or straight-edge, of some substantial length, usually 30 feet or so, but in any case of a length at least equal to the span of the track or wheels of the paving machine. A mobile grade reference device of this type is preferably constituted by a series of articulated arms supported by plural subgrade engaging skids or wheels; reference is made to,the pending application of Mun-' yon and Beaty, Ser. No. 202,127, filed Nov. 26, 1971, now U.Si Pat. No. 3,771,892, and assigned to the assignee of the present application, for a complete disclosure and explanation of this type of grade reference device. Such a device spans hollows and sags and lengthens humps byproviding a ramp action on either side thereby ensuring a minimum thickness of material over control systems of the such hump. A mobile grade reference device of this formactuates the screed control sensing means such that the hollows and sags are filled with asphalt material and the humps covered with the asphalt material to provide an optimum pavement profile.

As explained in Munyon U.S. Pat. No. 3,285,148, as-

signed to the assignee of the present application, optimum results are achieved by locating the sensor of the automatic screed control system a short distance forwardly of the leading portion of the screed. As set forth in the aforementioned application of Munyon and Beaty, optimum results are obtained from the use of an elongated mobile grade reference device when the sensor engages the stringline at the longitudinal midpoint of such mobile grade reference device. Accordingly, in constructing a system embodying the advantageous principles referred to in both the aforementioned'Munyon patent and application of Munyon and Beaty, it necessarily follows that the mobile grade reference device must be located outboard of the lateral extremity of the screed in order that the latter is cleared by the trailing portion of the former. In many instances, the mobile grade reference device cannot be so positioned because the surface of the area adjacent the surface to be paved is unsuitable for movement of the mobile grade reference device,-due.to roughness or other undesirable conditions, such as obstructions.

When these conditions are encountered, the only practical alternative is to mount the mobile grade reference device forwardly of the screed and within the lat- 'eral extremities thereof. However, such a location of the grade reference device resultsin a substantial reductionin accuracy of the automatic control system with consequent unevenness in the pavement profile. This undesirable result obtains because the effective length of the mobile grade reference device will be substantially reduced as the sensor will engage the stringline on the mobile grade reference device adjacent the trailing end of the latter and not at its longitudinal midpoint. It will be recalled that according to the teachings of the above mentioned Munyonpatent, the sensor should be mounted. just forwardly of the leading portion of the screed. In an arrangement such as the one just described, the effective length of the mobile grade reference device will be approximately two times the distance from the trailing end of the grade reference device (which will be located as near the leading edge of the screed as practical) to the point on the stringline established by'engagement of the sensor, the stringline being of course carried by the mobile grade reference device. Such an arrangement will level only very short undulations in the subgrade and will more or less reproduce longer deviations from the means grade.

In Long U.S. Pat. No. 3,618,484, a grade reference device consisting only of a pair of side-by-side wheels is mounted forwardly of the screed and within the approximate lateral extremities thereof. A longitudinally extending beam carrying a stringline is supported at its opposite ends by a pair of vertically disposed, fluid operated cylinders. The piston rod of the cylinder at the forward end of the beam is supported by the aforesaid pair of wheels;.the piston rod of the cylinder at the rear end of the beam is supported by the screed. A sensor unit is provided to actuate the fluid cylinders in a manner to maintain the beam level or at a predetermined slope. Therefore, according to this device vertical movements of the grade reference device constituted by the pair of wheels are not transmitted to the stringline but rather are compensated for by the forward fluid cylinder. Further, the mechanism shown in this Long patent is disadvantageous in that it does not employ the preferred form of grade reference device having plural, longitudinally spaced, subgrade engaging skids or wheels.

SUMMARY AND OBJECTS OF THE INVENTION which means actuate the sensor of the automatic systern with such a high degree of accuracy that the hollows and sags are filled with asphalt materials and the humps covered with an adequate layer of such material to provide a highly desirable pavement profile.

A primary object of the present invention is the provision of unique means for attaching a mobile grade reference device to the screed forwardly and within the lateral extremities thereof.

Another object of the present invention is the .provision of a mobile grade reference mechanism of the type described, which mechanism includes a grade reference beam extending longitudinally of the direction of travel of the paving machine, such beam having the forward end thereof pivotally mounted to the mobile grade reference device at the longitudinal midpoint thereof and at a location rearwardly of the pivot axes of the draft arms for the'screed, such beam having its trailing end pivotally attached to the screed.

Still another object of the present invention is the provision of a mobile grade reference mechanism as referred to in the preceding object and wherein the sensor engages the longitudinally extending beam at a location forwardly of the leading portion of the screed.

' These and other objects and advantages of the invention will become apparent from the following specification disclosing a preferred embodiment shown in the accompanying drawings.

DESCRIPTION OF THE DRAWINGS DESCRIPTION OF A PREFERRED EMBODIMENT Referring in particular to FIG. 1, an asphalt paving machine of well known type is generally designated 10. This paving machine includes a screed 12 towed behind the machine by a pair of draft arms, one arm being illustrated and designated 14. The draft arms are mounted to the paving machine for pivoting movement the pivot axis for the draft arm 14 is designated 15 (FIG. 4A). Power means, such as hydraulic cylinders, are attached to the forward ends of the draft arms for raising and lowering the pivot axes thereof for varying the angle of attack of the screed thereby to control the thickness of the pavement layer or lift, all in a manner well known to those skilled in the art. Reference should be had to the aforementioned Munyon patent for a complete description of the screed and the means for mounting and controlling the same.

The mobile grade reference device, generally designated 18, includes a first arm or beam 19 pivotally mounted at its respective opposite ends to the longitudinal midpoints of other arms or subbeams 20 and 21. The arm 20 has the opposite ends thereof respectively pivotally engaged with a pair of skids or shoes 23, 24. Similarly, the respective opposite ends of the arm 21 are pivotally engaged with another pair of skids or shoes 25, 26. It will be understood that the skids 23 trough 26 engage and slide along the subgrade. As used herein, the tenn subgrade has reference to the surface which is to receive the bituminous or asphalt material being laid by the paving machine, whether such surface is formed by previously laid bituminous material, graded earth or a layer of aggregate placed on the earth.

The paver 10 mounts a laterally disposed towing arm 28 which is braced by a diagonal arm '29, one end ofthe latter being connected to theframe of the paving machine. The distal end of the towing arm 28 is pivotally connected with a towing link 30, the latter being suitably pivotally engaged with a bracket 31 mounted on the arm orsubbeam 20. It will be apparent that the mobile grade reference device 18 will be towed by the paving machine 10. It is desirable to provide lateral stability to the mobile grade reference device by employing a link 33, one end being pivotally engaged with a bracket 34 on the arm 21 and the other end of such link being pivotally secured to the paver.

A post or column 36 is rigidly secured to the arm 19 at the longitudinal ,midpoint of the latter and which point is also the longitudinal midpoint of the mobile grade reference device 18. This column is telescopingly received within a tube 37; preferably, frictional means adapted to be operated by a handle 38 are provided for adjusting the amount of insertion of the column 36 within the tube 37.

As best seen in FIG. 3, the upper end of the tube 37 is rigidly connected to an upwardly disposed channel member 40, which member receives one end of a grade reference beam 42. which may be an I-beam or wide flange rolled section. A latch spring 43 extends over the beam 42 and has opposite ends thereof suitably secured to the channel member 40. The spring 43 provides for connecting and disconnecting the beam 42 and tube 37 and also permits pivotalmovement between the beam 42 and the tube 37, such pivoting movement being about a horizontal axis designated 44 (FIG. 4A). At this time it should be mentioned, for reasons which will be explained hereinbelow, that this horizonal pivot-axis thereof, which. post in turn mounts a bar 49 in horizontally disposed fashion. Preferably, means are provided for adjustably positioning the bar 49 in a horizontalplane. One end of the bar 49 is engaged by a diagonal brace 52, the latter being secured to the post 48. This same end of the bar 49'mounts a post 54, the lower end of which post mounts asensing mechanism 55, which sensing mechanism may be of the type disclosed in the aboye mentioned Munyon'patent. The sensing mechanism 55 includes a sensor arm 56, one end of which is engaged with astringline 57, opposite ends of such stringline being secured to upstanding pins 58 secured to the beam 42 adjacent its respective ends. Preferably, the bar 49' mounts the post 54 for.vertical adjustable movement. It will be understood that the sensor mechanism 55 ismounted, consistent with the teachings of the above mentioned Munyon patent, forwardly of the forward portion of the screed 12 and preferably adjacent to the forward portion of the screed. In a preferred form of this invention, the beam 42 has a length twice the distance between the rearward pivot point thereof and the point of engagement betweenthe sensor arm 56 and the stringline 57; in other words, the sensor arm engages the stringline at the midpoint of the beam 42 It will be understood that movement of the sensor armt56, in response to movement of the stringline 57, will activate the control system for actuating the hydraulic rams to raise or lower the pivot axes of the draft arms thereby to vary the angle of attack of the screed, all in a manner well knownto those skilled in the art. Again reference is made to the Munyon patent for a description of the control system for so raising and lowering the pivot axes of the draft arms.

The operation of the present invention can be best understood by reference to FIGS. 4A through 4E.

arm pivot axis upwardly thereby to restore the screed to the proper angle of attack.

It will be apparent that if the horizontal pivot axis 44' between the tube 37 and the beam 42 were disposed forwardly of the pivot axis 15 for the draft arm, the systern would then be inoperable as the resultant movement of the sensor arm 56 would be the opposite of that just described causing the automatic screed control system to run out of control. Accordingly, in the use of the present invention it is critical that the pivot axis 44 be located rearwardly of the pivot axes of the draft arms. The horizontal displacement of the pivot axis 44 rearwardly of the draft arm pivots may be small to allow for maximum length of the grade reference beam 42. a

FIG. 4D illustrates the situation wherein the pivot axis of one or both of the draft arms is movedupwardly as the result of corresponding upwardmovement of the paving machine itself. It is apparent that the sensing arm 56 will be moved so as to actuate theassociated control system to move the pivot axis of one or both of the draft arms downwardly. FIG.- 4E illustrates the opposite situation wherein the pivot axis of the draft arm is moved downwardly as the result of corresponding FIG. 4A illustrates the system in what may be termed a static condition. In'such condition, the sensing arm 56 l is in a zero positionjfor establishing the predetermined angle of attack of the screed.

Disturbances, i.e., errors, may be introduced at the screed itself, as well as at the draft arm pivot axes, in

- either case causing the screed to deviate from the desired path. By way of example, these errors at the screed can be the result of changes in the forward speed .of the paving machine, changes in mix temperature affecting mix viscosity and variations in the quantity of the mixture in the distribution auger chamber.

FIGS. 48 and 4C illustrate the manner in which the screed attached grade reference mechanism of the present invention makes corrections'for disturbances at in which the present invention corrects for disturbances or 'movements at the pivot axes of the draft arms in response to vertical displacements of the paving machine as it. travels over humps or hollows in the subgrade.

Referring to FIG. 4B, an error at the screed has the screed itself; FIGS. 4D and 4E illustrate the manner movement of the paving machine, in which situation the sensing arm 56 is moved for raising the pivot axis of the draft arm thereby to restore the screed to its proper angleof attack disposition.-

It is preferable that the automatic screed control system with which thepresent invention is associated include power means for raising and lowering the pivot axes of both draft arms. However, power means may be provided for only one draft arm with manually actuated means being provided for raising and lowering the pivot axis of the other draft arm. As is known to those skilled vided at both sides of the paving machine orat one side of the machine and in combination with transverse slope control mechanism, the latter being shown in the aforementioned Munyon patent.

It is apparent that the present invention permits the sensor of the sutomatic screed control system to be 10- cated in its optimum position forwardly of the forward portion of the screed. Further, it is apparent that the present invention permits mounting of the mobile grade reference device forwardly of the screed within the lateral extremities thereof and with sensings from the mobile grade reference device being taken at the longitudinal midpoint thereof. It is also noted that the present invention permits the mobile grade reference device to be of rather substantial length which is, of course, a desired feature.

We claim:

1. In a paving machine of the type having a screed which is pulled at the rear of the machine by a pair of draft arms, the forward ends of said draft arms being pivotally engaged with the machine, wherein powered actuating means are provided for varying the angle of attack of the screed, and wherein a control system operates said powered actuating means in response to movement of a grade reference sensor, the improvement comprising:

a. a mobile grade reference device elongated longitudinally in the direction of travel of the paving machine;

. a grade reference beam extending longitudinally of the direction of travel of the paving machine;

. rigid connecting means securing the forward end of said beam to said grade reference device intermediate the ends thereof such that vertical movements of the latter are directly transmitted to the former whereby said forward end of said beam and the portion of said grade reference device adjacent said connecting means move vertically in unison, said rigid connecting means including first horizontal pivot means pivotally connecting said forward end of said beam with said grade reference device and defining a horizontal pivot axis located rearwardly of the pivot axes of the draft arms;

d. second horizontal pivot means pivotally connecting the rearward end of said beam with the screed;

e. support means mounting said sensor for movement with the screed and at a location intermediate the ends of said beam;'and

f. said beam including an element engaged by said sensor for moving the latter thereby to activate said v control system in response to relative vertical displacements between said mobile grade reference device and said screed.

2. The improvement according to claim 1 further defined by said connecting means mounting said mobile grade reference device forwardly of said screed and within the lateral extremities thereof, said first pivot means including a member connected to said mobile grade reference device adjacent the longitudinal midpoint thereof, and said sensor being -located adjacent the longitudinal midpoint of said beam.

3. The improvement according to claim 1 wherein said second pivot means pivotally connects said beam with the screed adjacent the rearward portion of the latter.

4. The improvement according to claim 1 wherein said support means mounts said sensor forwardly of the forward portion of the screed and adjacent thereto.

5. The improvement according to claim 1 wherein said element is defined by a stringline on said beam.

6. The improvement according to claim 2 further defined by, said second pivot means including a member rigidly connected to said screed and upstanding therefrom -so as to cooperate with said rigid connecting means to mount said beam in substantial horizontal disposition and at an elevation above said screed.

7. The improvement according to claim 6 wherein I said one member of said second pivot means is connected to said screed adjacent the rearward portion thereof.

8. The improvement according to claim 2 further defined by, said mobile grade reference device including a plurality of longitudinally extending articulated arms supported from plural subgrade engaging members.

9. in a paving machine of the type having a screed which is pulled at the rear of the machine by a pair of draft arms, the forward ends of said draft arms being pivotally engaged with the machine, wherein powered actuating means are provided for varying the angle of attack of the screed, and wherein a control system operates said powered actuating means in response to movement of a grade reference sensor, the improvement comprising:

a. a mobilegrade reference device including a plurality of articulated arms supported by plural subgrade engaging members, which arms extend longitudinally of the direction of travel of the paving machine;

b. means connecting said mobile grade reference device to the paving machine for movement therewith and in a positionforward of the screed and within the lateral extremities thereof;

c. a grade reference beam extending longitudinally of the direction of travel of the paving machine;

d. rigid connecting means securing the forward end of said beam to said grade reference device intermediate the ends thereof such that vertical movements of the latter are directly transmitted to the former whereby said forward end of said beam and the portion of said grade reference device adjacent said connecting means move vertically in unison, said rigid connecting means including first horizontal pivot means pivotally connecting said forward end of said beam with said grade reference device and defining a horizontal pivot axis located rearwardly of the pivot axes of the draft arms;

second horizontal pivot means pivotally connecting the rearward end of said beam with said screed;

f. support means mounting said sensor for movement with the screed and at a location intermediate the ends of said beam; and

g. said beam including an element engaged by said sensor for moving the latter thereby to activate said control system in response to relative vertical displacements between said mobile grade reference device and said screed.

10. The improvement according to claim 9 wherein said support means mounts said sensor forwardly of the forward portion of said screed and adjacent thereto and at a location adjacent the longitudinal midpoint of said beam.

11. The improvement according to claim 10 wherein said second pivot means connects said beam to said screed adjacent the rearward portion of the latter.

12. The improvement according to claim 11 wherein said element on said beam is engaged by said sensor adjacent-the longitudinal midpoint of said beam.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3272099 *Jan 31, 1963Sep 13, 1966Drake Frank MStringline attachment for paving machine
US3285148 *Mar 1, 1963Nov 15, 1966Barber Greene CoGrade control system on bituminous pavers
US3466990 *Oct 6, 1967Sep 16, 1969Gordon H Ball IncPaving machine
US3519770 *Jul 19, 1968Jul 7, 1970Anson Howard GSwitching apparatus for servo system
US3618484 *Sep 11, 1969Nov 9, 1971Long GeorgeTraveling grade controller
DD41773A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4140420 *Mar 16, 1978Feb 20, 1979Cmi CorporationPortable grade averaging apparatus
US4213719 *Sep 28, 1978Jul 22, 1980Cmi CorporationGrade averaging apparatus
US4270801 *Aug 14, 1979Jun 2, 1981Cmi CorporationSteering and cutter drum positioning in a paved roadway planing machine
US4722636 *Aug 4, 1986Feb 2, 1988Astec Industries, Inc.Self-adjusting, self-leveling tandem screed
US4852278 *Jun 23, 1987Aug 1, 1989Kajima CorporationMethod and apparatus for grading and measuring a surface having a curved profile
US4948292 *Jul 24, 1989Aug 14, 1990Cedarapids, Inc.Paving machine having transversely and longitudinally adjustable grade sensors
US5356238 *Mar 10, 1993Oct 18, 1994Cedarapids, Inc.Paver with material supply and mat grade and slope quality control apparatus and method
US5401115 *Aug 25, 1994Mar 28, 1995Cedarapids, Inc.Paver with material supply and mat grade and slope quality control apparatus and method
US5607205 *Jun 6, 1995Mar 4, 1997Caterpillar Inc.Object responsive implement control system
US6113310 *Jun 19, 1998Sep 5, 2000Hesse, Jr.; RonaldRoad repair apparatus and method for pavement patching
US8591141 *Sep 8, 2011Nov 26, 2013SMG Sportsplatzmachinebau GmbHMobile paving machine
US20120063847 *Sep 8, 2011Mar 15, 2012SMG Sportplatzmachinebau GmbHMobile paving machine
Classifications
U.S. Classification404/84.1, 404/118
International ClassificationE01C19/00, E01C19/48
Cooperative ClassificationE01C19/4873, E01C19/008
European ClassificationE01C19/00C3, E01C19/48D3
Legal Events
DateCodeEventDescription
Dec 23, 1991ASAssignment
Owner name: CATERPILLAR PAVING PRODUCTS INC. AN OK CORPORAT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BARBER-GREENE COMPANY, A CORPORATION OF DE;REEL/FRAME:005957/0281
Effective date: 19910417
Dec 23, 1991AS02Assignment of assignor's interest
Owner name: BARBER-GREENE COMPANY, A CORPORATION OF DE
Effective date: 19910417
Owner name: CATERPILLAR PAVING PRODUCTS INC. AN OK CORPORATION
Dec 9, 1991ASAssignment
Owner name: BARBER-GREENE COMPANY, ILLINOIS
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITIZENS AND SOUTHERN TRUST COMPANY (GEORGIA) N.A., AS SECURITY TRUSTEE FOR THE BENEFIT OF FIRST NATIONAL BANK OF CHICAGO, THE ; SEE DOCUMENT FOR OTHER ASSIGNORS.;REEL/FRAME:006129/0278
Effective date: 19910417
Owner name: CITIZENS AND SOUTHERN TRUST COMPANY (GEORGIA), GEO
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ILLINOIS
Free format text: AMENDMENT TO A PREVIOUSLY RECORDED SECURITY AGREEMENT DATED APRIL 27, 1989;;ASSIGNORS:BARBER-GREENECOMPANY;ROADTEC, INC.;TRENCOR JETCO, INC.;REEL/FRAME:006113/0075
Effective date: 19910301
Jun 14, 1990ASAssignment
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Free format text: SECURITY INTEREST;ASSIGNORS:BARBER-GREENE COMPANY;ROADTEC, INC.;TRENCOR JETCO, INC.;AND OTHERS;REEL/FRAME:005357/0010
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Owner name: BARBER-GREENE COMPANY
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE
Owner name: ROADTEC, INC.
Owner name: TELSMITH, INC.
Effective date: 19900516
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Owner name: BARBER-GREENE COMPANY, 400 NORTH HIGHLAND, AURORA,
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Owner name: FIRST AMERICAN NATIONAL BANK OF NASHVILLE, TENNESS
May 27, 1987ASAssignment
Owner name: BARBER-GREENE COMPANY, 400 NORTH HIGHLAND AVENUE,
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:B.V. OCEANIC FINANCE COMPANY;REEL/FRAME:004730/0767
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Jan 16, 1987AS17Release by secured party
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Effective date: 19840203