US3069983A - Method of laying roads and apparatus therefor - Google Patents

Method of laying roads and apparatus therefor Download PDF

Info

Publication number
US3069983A
US3069983A US727684A US72768458A US3069983A US 3069983 A US3069983 A US 3069983A US 727684 A US727684 A US 727684A US 72768458 A US72768458 A US 72768458A US 3069983 A US3069983 A US 3069983A
Authority
US
United States
Prior art keywords
machine
line
mat
asphalt
circuit
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
Application number
US727684A
Other languages
English (en)
Inventor
Pizzarotti Pietro
Leoncini Giovanni
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.)
Impresa Pizzarotti & C Srl
Impresa Pizzarotti & Csrl
Original Assignee
Impresa Pizzarotti & C Srl
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 Impresa Pizzarotti & C Srl filed Critical Impresa Pizzarotti & C Srl
Application granted granted Critical
Publication of US3069983A publication Critical patent/US3069983A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • E01C19/004—Devices for guiding or controlling the machines along a predetermined path
    • E01C19/006—Devices for guiding or controlling the machines along a predetermined path by laser or ultrasound
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B69/00—Steering of agricultural machines or implements; Guiding agricultural machines or implements on a desired track
    • A01B69/007—Steering or guiding of agricultural vehicles, e.g. steering of the tractor to keep the plough in the furrow
    • A01B69/008—Steering or guiding of agricultural vehicles, e.g. steering of the tractor to keep the plough in the furrow automatic
    • 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
    • E01C19/48—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 laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E01C19/4833—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 laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means
    • E01C19/4853—Apparatus designed for railless operation, e.g. crawler-mounted, provided with portable trackway arrangements
    • E01C19/486—Apparatus designed for railless operation, e.g. crawler-mounted, provided with portable trackway arrangements with non-vibratory or non-percussive pressing or smoothing means; with supplemental elements penetrating the paving to work the material thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G01C15/002—Active optical surveying means
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S37/00—Excavating
    • Y10S37/907—Automatic leveling excavators

Definitions

  • this invention has to do with an improved method for laying road mats of bituminous mix by employing asphalt finishing machines or tampingleveling finishers.
  • the machines of this kind have given a remarkable contribution towards the solution of the problem of properly laying, on road bases, airstrip bases, turnpike road bases and the like, a uniform, compact and level mat of bituminous mix.
  • Said asphalt finishers or tamping-leveling finishers are only capable of smoothing or minimizing short-wave ripples, whereas they are almost inefficient if it is desired to suppress variations in transverse grade variations and wavy irregularities of the road base having a wavelength exceeding four yards approximately, since the finishing machines referred to above are generally designed to lay road bases, surface base courses, or surface courses of a uniform preselected thickness.
  • the asphalt finishing machines receive motive power from a tractor unit through crawlers or wheels traveling on the road base, and comprise, in their general constructional outline, a receiving hopper for the bituminous mix located in the front portion of the machine, a spreading mechanism for said bituminous mix, a tamping unit, generally of vibratory type (in some cases a relatively bulky tamper is provided which is vertically reciprocated at a somewhat low rate), and a mechanism for controlling the thickness of the finished pavement.
  • the method according to this invention comprises the steps of providing at least a reference line parallel to a preselected theoretical grade line, and of continuously adjusting the mat thickness control member of a nishing machine so that the profile of the bituminous mat being laid by the machine is in every instant of time parallel to said reference line, and, consequently, parallel to the grade line desired.
  • said reference line consists either of a beam of luminous rays or a line of sight such as provided by a surveying instrument.
  • the reference line parallel to the grade line is the axis of a beam of luminous rays provided by illuminating means external to the finishing machine and placed ahead of the machine, photoelectric means being provided aboard the machine, which are responsive to the displacements of a fixed point of the machine relatively to the axis of said beam of luminous rays, said photoelectric means operating a servomechanism intended for actuating the members adapted to control the thickness of the bituminous mat.
  • a screen for example a translucent screen of the so-called Reflex type, adapted to collect the trace of the beam of luminous rays referred to above, said screen having fiducial lines or marks thereon, adapted to individualize and check the displacements of a fixed point of the screen relative -to the luminous spot formed by the luminous beam, the axis of which, fixed in the space, defines the desired grade line.
  • An observer checking the luminous spot on the screen is enabled to immediately appreciate by what distance the profile of the bituminous mat being laid departs from the grade line, and to readily intervene by manipulating the mat thickness control members with which an asphalt finisher is conventionally equipped.
  • Reflex screen (or the photoelectric cells, if a servomechanism, for actuating the mat thickness control members, is adopted) be solidly aixed to the mat thickness control members of the asphalt finishing machine.
  • the reference line parallel to the preselected grade line is a line of sight provided by a surveying instrument placed ahead of the traveling asphalt finisher and at suitable distance, for example from to 150 yards therefrom.
  • a line of sight provided by the cross-hairs of a telescope of a suitable surveying instrument such as for example a level or a theodolite, will be put in collimating relationship with a vertical sigh-ting stake placed in a convenient location on the finishing machine. In such a case, the attendant Will not be aboard the machine, but will take readings with the sighting instrument.
  • Telecontrol can be effected either by an electric cable or by radio.
  • the operator who attends to taking readings of the surveying instrument has a pushbutton panel available, which is connected, by means of a fiexible electric cable, to the servo-mechanis for example an electric servomotor, so that the operator himself can actuate the mat thickness control members of the machine.
  • control pulses are transmitted by the operator by means of a pushbutton set controlling a small radio transmitter placed near the surveying instrument and are received by a small receiving set installed on the asphalt finisher; and these pulses are amplified to actuate the servomechanism for controlling the mat thickness control members of the asphalt finisher.
  • FIG. 1 diagrammatically represents an asphalt finishing machine equipped according to one embodiment of this invention with an apparatus comprising a training reticle and with photoelectric cells for controlling a servoinotor on the machine, a source of luminous rays for actuating the control mechanism being also shown;
  • FIG. 2 shows in front elevation, partly in section, the reticle and the photoelectric cells
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2;
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 2;
  • FIG. 5 is a wiring diagram of the control circuit for the servomotor shown in FIG. l;
  • FIG. 6 shows in a somewhat diagrammatic fashion an asphalt finishing machine equipped according to another embodiment of this invention with a radio telecontrol apparatus
  • FIG. 7 is a wiring diagram of the transmitter unit of the apparatus shown in FIG. 6;
  • FIG. 8 is a wiring diagram of the receiver unit of apparatus shown in FIG. 6;
  • FIG. 9 shows m a somewhat diagrammatic fashion an asphalt finishing machine equipped according to still another embodiment of this invention with a cable telecontrol apparatus.
  • FIG. l() shows in .some detail this servomotor control circuit.
  • a tamping-leveling asphalt finisher generally designated by the reference character VF, can be seen.
  • machines of this kind commonly in use, comprise, proceeding ⁇ from the front portion to the rear portion of the machine, a receiving hopper i. for the bituminous mix, a spreading mechanism 2, a tamper 3 and a pressure member 4 (also called a screed or leveling shoe) whose height is adjustable in order that the thickness of the bituminous mat being laid might be controlled.
  • This mat thickness control member is generally formed by a screw 5 connected to the leveling shoe 4 and actuated, for example via a handwheel, by an attendant aboard the machine.
  • a base piece 6 is connected which protrudes from one side of the machine VF, said base piece 6 being intended to support, for example by means ot a mounting pillar 7 affixed thereto, a control and sighting unit 8 comprising a translucent screen 9, for example of the Reflex type, and one pair of photoelectric cells 10 and I0.
  • FIGURES 2, 3 and 4 of the accompanying drawings clearly show the translucent screen and the two photoelectric cells as well.
  • the translucent screen 9 is employed whenever it is desired to control the thickness of the bituminous mat by the manual control method. If this is the case, the luminous spot provided by the instrument l1, comprising a projector Il (fed by a battery B, FlG. l) and a training telescope 11, is projected on the screen 9.
  • the luminous spot impinges in the area 9 at the center of the reticle provided on the screen 9
  • the attendant is assured that the asphalt finisher is following the preselected grade line within the prescribed tolerances.
  • the adjustment of the instrument 11i with respect to the screen 9 is effected, before starting to work with the asphalt finisher, by collimating with the telescope l1" on the fiducial line 9 of the screen 9, since the distance between 9 and 9 is equal, by construction, to the distance between 11' and Il.
  • the two photoelectric cells 10 and l0 are mounted, as shown in FIG. 2. These photoelectric cells are in use when it is desired to adopt the automatic operation of the mat thickness control members 4 and 5 by means of a servomechanism, as will be explained more, in detail hereinafter.
  • the two photoelectric cells 10 and I0 are electrically connected to a unit i?. which, in turn, controls a servomotor 13.
  • the servomotor i3 actuates, for example via a Cardan joint 14 and a worm-and-wheel gearing comprising a worm i5 and a worm wheel l5', the elevation screw S of the leveling shoe 4.
  • the worm wheel 1S will be keyed to the shaft of the screw 5.
  • the two photoelectric cells in and itl are equally illuminated, there is no potential difference between the terminals x, y of the bridge circuit (FIG. 5) and the machine VF will follow the preselected grade line.
  • the beam of luminous rays coming from the projector lli' illumistates the two photoelectric cells unevenly, there will be :a potential difference between the terminals x and y (FIG.
  • FIG. 5 shows in ⁇ some detail the control circuit which is not itself a part of the present invention.
  • the two cells l() and itl are bridged, and the terminals x, y of the bridge circuit are connected to an amplifying stage DA and, via a polarized relay IBR, control the switch unit i2 and therethrough the servo-motor i3.
  • the sense of rotation of the servo-motor 13 will dependl upon the sign of the difference of potential existing at the bridge output, so that lifting or depressing of the leveling shoe or screed t takes place accordingly.
  • FIG. 5 actually represents the position the circuit assumes when there is no difference of potential between the terminals x, y, and the polarized relay PR is in its inoperative or rest position.
  • AV is a vibrator feed-er such as those extensively used in the power packs of autoradios and other portable equipment.
  • FIG. 6 shows the arrangement to be adopted when it is desired to employ the radio telecontrol method for actuating the thickness control members, the reference line being a line of sight.
  • a radio-receiver generally connoted by the symbol RR, connected to a control unit l2 whose wiring diagram is very much similar to that of the unit 12 of the diagram of FIG. 5.
  • the servo-motor 13 and the mechanical means adapted to connect it to the screed 4 are in this case very much the same as described in connection with FIG. l.
  • a vertical sighting stake VS is also installed and is borne by a pillar 7 connected to the basepiece 6 solidly affixed to the creed 4.
  • a surveying instrument for example a level or a theodolite, is placed and provides a line of sight, visible in the drawing, parallel to the preselected grade line.
  • the attendant at the surveying instrument actuates, through a pushbutton set PB, a small radio-transmitter RT whose signals are received by the receiving set RR on the machine VF.
  • FIGURES 7 and 8 show the transmitting and receiving circuits of the apparatus shown in FIG. 6.
  • FIG. 7 illustrates the transmitter circuit.
  • the two push-buttons F and G, shown in FIG. 6 also, are shown and serve to close the circuit.
  • Said circuit comprises a 60 kHz. oscillator OSC, a 65 kHz. oscillator OSC', a modulating stage (with a cathode follower) MOD-CF and a 30 kHz. oscillator OSC".
  • the circuit is fed by a vibrator AV and a 6 v. battery.
  • the antenna is a semi-dipole (1A lambda).
  • the push buttons F and G actuate either of the oscillators OSC, OSC' at 60 and 65 kHz. respectively. Either of these frequencies provides a screen-grid modulation, through the cathode-follower modulating stage, for the 30 MHz. frequency generated by the oscillator OSC.
  • FIG. 8 shows the receiver circuit which comprises a semi-dipole (1A lambda), a 30 MHz. detect unit DU generating either 60 or 65 kHz. signals, an aperiodic ampliiier AMP amplifying said signals, two band-pass filters BPF, BPF tuned to 60 and 65 kHz. respectively, two detectors D' and D at 60 and 65 kHz. respectively, two power amplifiers PA, PA', a vibrator AV and two relays R', R" actuated by the nal power stages PA, PA respectively.
  • circuits brietiy described in the foregoing need not any further illustration since they can be readily understood by all those skilled in the art.
  • FIG. 9 shows the arrangement which is adopted when it is desired to employ the telecontrol by electric iiexible cable.
  • the general arrangement is that described in connection with FIG. 6 unless, obviously, the two radio sets are lacking, and the control push-button set PB is directly connected by a cable to the unit 12' (FIG. 6) for actuating the servo-motor 13.
  • the readings on the instrument 16 are taken in very much the same way as described in connection with FIG. 6 and the attendant at the instrument manipulates the push-buttons F and G of the push-button set PB just as already described.
  • FIG. represents still more in detail the control circuit for the servomotor 13.
  • the servo-motor 13 is preferably, a direct-current reversible series motor, i.e. a motor having two exciting windings coiled in reverse senses.
  • the simple circuit diagram shows the two relays 20 and 21, for lifting and depressing the leveling shoe 4, respectively.
  • Two pilot lamps 20 and 21', shunted to the coils of the relays 20 and 21, respectively, are also shown in the drawing.
  • the terminals A, B, C of the servo-motor 13 can be connected to a three-leg plug, for example A"", B"", C" (FIG. 5) of the control system employing photoelectric cells, or to a three-leg plug A, B", C" (FIG. 8) of the control system employing radio waves, or also to a three leg plug A', B', C (FIG. 10) of the control system by cable.
  • a three-leg plug for example A"", B"", C" (FIG. 5) of the control system employing photoelectric cells, or to a three-leg plug A, B", C" (FIG. 8) of the control system employing radio waves, or also to a three leg plug A', B', C (FIG. 10) of the control system by cable.
  • a method for laying a road mat according to a grade line with a road finishing machine equipped with a road leveling member, means for adjusting said member vertically to control the thickness of said mat and the location of its upper surface, and an electrical circuit for actuating said adjusting means comprising the steps of irst providing a fixed reference line of sight extending parallel to said grade line from a stationary point ahead of the finishing machine to a second point on the machine which is in iixed relation to said leveling member, continuously checking during the operation of said machine the position of said reference line with respect to said second point by sighting along said reference line from said stationary point toward said second point, and manually controlling said circuit for actuating said adjusting means remotely from said second point to maintain said second point in said reference line with said reference line in constant parallel relationship with the grade line.
  • a method for laying a road mat according to a grade line with a road finishing machine equipped with a road leveling member and with radio-wave telecontrol-operated means for adjusting said member vertically to control the thickness of said mat and the location of its upper surface comprising the steps of first setting up a telescope in a stationary position at a point spaced ahead of said machine within a distance of approximately yards, adjusting said telescope so that a reference line extending between the cross-hairs thereof is parallel to said grade line, providing a second point on the machine which is in fixed relation to said leveling member and coincident with said reference line when said member is in its desired vertical position relative to said grade line, continuously checking during the operation of said machine the position of said reference line with respect to said second point by sighting through said telescope along said reference line toward said second point, and manually controlling the transmission of radio waves from a position adjacent said telescope for selectively controlling the operation of said adjusting means to thereby maintain said second point coincident with said reference line as said machine approaches said telescope.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Road Paving Machines (AREA)
US727684A 1957-06-18 1958-04-10 Method of laying roads and apparatus therefor Expired - Lifetime US3069983A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT909957 1957-06-18

Publications (1)

Publication Number Publication Date
US3069983A true US3069983A (en) 1962-12-25

Family

ID=33042646

Family Applications (1)

Application Number Title Priority Date Filing Date
US727684A Expired - Lifetime US3069983A (en) 1957-06-18 1958-04-10 Method of laying roads and apparatus therefor

Country Status (2)

Country Link
US (1) US3069983A (en))
NL (2) NL228825A (en))

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141418A (en) * 1960-01-04 1964-07-21 Pullman Inc Method and apparatus for determining track and road surfaces and the like
US3321248A (en) * 1965-03-09 1967-05-23 Hughes Tool Co Tunneling machine guidance by impingement of laser beam on pair of machine carried targets
US3482103A (en) * 1965-10-11 1969-12-02 Boyles Bros Drilling Co Apparatus for controlling travel path of a movable device
US3566759A (en) * 1968-12-17 1971-03-02 Gurries Mfg Co Mounting arrangement for sidewalk building equipment or the like
JPS4976302A (en)) * 1972-11-24 1974-07-23
US4117712A (en) * 1976-01-23 1978-10-03 Armstrong Cork Company Emissimeter and method of measuring emissivity
US4403889A (en) * 1981-06-08 1983-09-13 Gillotti John A Grade control alignment device and method
US4752156A (en) * 1987-01-27 1988-06-21 Owens Joe M Laser-guided portable screed
US4978246A (en) * 1989-07-18 1990-12-18 Quenzi Philip J Apparatus and method for controlling laser guided machines
US5129803A (en) * 1988-05-24 1992-07-14 Shimizu Construction Co., Ltd. Concrete leveling machine
US5524368A (en) * 1994-03-01 1996-06-11 Sno-Way International, Inc. Wireless snow plow control system
US6203244B1 (en) 1998-01-15 2001-03-20 Van-Boh Systems, Inc. Screeding apparatus
US20030161684A1 (en) * 2002-02-27 2003-08-28 Quenzi Philip J. Apparatus and method for subgrade preparation
US6691435B1 (en) 2002-09-25 2004-02-17 Sno-Way International, Inc. Plow system including a hydraulic fluid diverter
US20060008323A1 (en) * 2004-07-06 2006-01-12 Torvinen Jeffrey W Apparatus and method for subgrade preparation
RU2600002C1 (ru) * 2015-05-26 2016-10-20 Дмитрий Геннадиевич Козлов Способ определения траектории криволинейного движения трактора

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2295519A (en) * 1940-08-04 1942-09-08 Jaeger Machine Co Apparatus for surfacing roads
US2441532A (en) * 1945-02-23 1948-05-11 Jaeger Machine Co Machine or apparatus for surfacing roads
US2491275A (en) * 1945-09-26 1949-12-13 Jaeger Machine Co Leveling means or mechanism for road surfacing machines
US2591502A (en) * 1949-04-02 1952-04-01 Jaeger Machine Co Road paving machine
US2601277A (en) * 1945-03-03 1952-06-24 George P Green Road machine
US2796685A (en) * 1951-12-15 1957-06-25 Bensinger Isabell Mck Method and apparatus for earth grading and allied arts
US2844882A (en) * 1955-10-17 1958-07-29 Guntert & Zimmerman Const Div Automatic leveling mechanism for concrete slab laying machines
US2916836A (en) * 1955-06-24 1959-12-15 Karl J Stewart Photoelectric automatic blade level control

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2295519A (en) * 1940-08-04 1942-09-08 Jaeger Machine Co Apparatus for surfacing roads
US2441532A (en) * 1945-02-23 1948-05-11 Jaeger Machine Co Machine or apparatus for surfacing roads
US2601277A (en) * 1945-03-03 1952-06-24 George P Green Road machine
US2491275A (en) * 1945-09-26 1949-12-13 Jaeger Machine Co Leveling means or mechanism for road surfacing machines
US2591502A (en) * 1949-04-02 1952-04-01 Jaeger Machine Co Road paving machine
US2796685A (en) * 1951-12-15 1957-06-25 Bensinger Isabell Mck Method and apparatus for earth grading and allied arts
US2916836A (en) * 1955-06-24 1959-12-15 Karl J Stewart Photoelectric automatic blade level control
US2844882A (en) * 1955-10-17 1958-07-29 Guntert & Zimmerman Const Div Automatic leveling mechanism for concrete slab laying machines

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141418A (en) * 1960-01-04 1964-07-21 Pullman Inc Method and apparatus for determining track and road surfaces and the like
US3321248A (en) * 1965-03-09 1967-05-23 Hughes Tool Co Tunneling machine guidance by impingement of laser beam on pair of machine carried targets
US3482103A (en) * 1965-10-11 1969-12-02 Boyles Bros Drilling Co Apparatus for controlling travel path of a movable device
US3566759A (en) * 1968-12-17 1971-03-02 Gurries Mfg Co Mounting arrangement for sidewalk building equipment or the like
JPS4976302A (en)) * 1972-11-24 1974-07-23
US4117712A (en) * 1976-01-23 1978-10-03 Armstrong Cork Company Emissimeter and method of measuring emissivity
US4403889A (en) * 1981-06-08 1983-09-13 Gillotti John A Grade control alignment device and method
US4752156A (en) * 1987-01-27 1988-06-21 Owens Joe M Laser-guided portable screed
US5129803A (en) * 1988-05-24 1992-07-14 Shimizu Construction Co., Ltd. Concrete leveling machine
US4978246A (en) * 1989-07-18 1990-12-18 Quenzi Philip J Apparatus and method for controlling laser guided machines
US5524368A (en) * 1994-03-01 1996-06-11 Sno-Way International, Inc. Wireless snow plow control system
USRE38665E1 (en) 1994-03-01 2004-12-07 Sno-Way International, Inc. Wireless snow plow control system
US6203244B1 (en) 1998-01-15 2001-03-20 Van-Boh Systems, Inc. Screeding apparatus
US20030161684A1 (en) * 2002-02-27 2003-08-28 Quenzi Philip J. Apparatus and method for subgrade preparation
US6691435B1 (en) 2002-09-25 2004-02-17 Sno-Way International, Inc. Plow system including a hydraulic fluid diverter
US20060008323A1 (en) * 2004-07-06 2006-01-12 Torvinen Jeffrey W Apparatus and method for subgrade preparation
US7311466B2 (en) 2004-07-06 2007-12-25 Somero Enterprises, Inc. Apparatus and method for subgrade preparation
RU2600002C1 (ru) * 2015-05-26 2016-10-20 Дмитрий Геннадиевич Козлов Способ определения траектории криволинейного движения трактора

Also Published As

Publication number Publication date
NL228825A (en)) 1963-05-15
NL106265C (en)) 1963-10-15

Similar Documents

Publication Publication Date Title
US3069983A (en) Method of laying roads and apparatus therefor
CA2600070C (en) Method and system for controlling a construction machine
US20190212143A1 (en) Self-Propelled Civil Engineering Machine System With Field Rover
US10087588B2 (en) Road finishing machine with lateral operation unit
US2367907A (en) Panoramic radio receiving system
EP3650602B1 (en) Asphalt paver
US20060032063A1 (en) Method and system for controlling railroad surfacing
CN113597490A (zh) 沥青滚平机
US3181441A (en) Control apparatus
US3111070A (en) Paving machine with automatically controlled screed
CN110738582A (zh) 基于无人机的沥青路面压实方法、装置、计算机设备
US2965893A (en) Vehicle detector
US2838753A (en) Radio range-indicating systems
US3000121A (en) Automatic vertical control of earth moving machines
US3029716A (en) Paving machine control system
ES426668A1 (es) Procedimiento y maquina para batear y nivelar vias.
CA1098691A (en) Single beam reference system for railway surveying
JP2021085770A (ja) 移動体の位置情報取得方法、移動体の位置情報取得システム及び移動体の位置情報取得のためのコンピュータプログラム
US3796864A (en) Vehicle separation measuring system
CN203188267U (zh) 一种削坡机及其控制系统
US3018367A (en) Speed control system utilizing frequency change from inductive pickup
US2632135A (en) Automatic instrument landing system for air-borne craft
US3018368A (en) Speed control system utilizing frequency change from inductive pickup
US3141418A (en) Method and apparatus for determining track and road surfaces and the like
US2585605A (en) Navigational system