US3232408A - Method for retrieving magnetic roadway signal devices - Google Patents

Method for retrieving magnetic roadway signal devices Download PDF

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US3232408A
US3232408A US393706A US39370664A US3232408A US 3232408 A US3232408 A US 3232408A US 393706 A US393706 A US 393706A US 39370664 A US39370664 A US 39370664A US 3232408 A US3232408 A US 3232408A
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signal
roadway
signal device
metallic
signal devices
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US393706A
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Edward M Asbury
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/70—Storing, transporting, placing or retrieving portable devices

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  • This invention relates to a roadway signal device retriever and more particularly to a metallic roadway signal device retriever wherein metallic roadway signal devices are picked up from the road surface by a magnetic device and conveyed to a haulage vehicle.
  • Roadway sigral devices are used to alert motorists of recently painted lines on the roadway.
  • the signal devices are positioned at spaced intervals on the road surface adjacent the newly painted lines and remain on the road surface until the paint has dried.
  • Recent improvements in the method and apparatus for painting the lines on the road surface have increased the speed at which the paint is applied to the road surface. The method of positioning and retrieving the signal devices has not kept pace with these improvements.
  • the vehicle used to retrieve the signal devices has a platform extending laterally therefrom on which a workman is stationed.
  • the platform is usually built close to the road surface and the vehicle is steered so that the workman can reach out and manually retrieve the signal devices.
  • my invention includes a retriever connected to the rear of a haulage vehicle.
  • the retriever includes a magnetic member adjacent the road surface that picks up the metallic signal devices and deposits them on the upper conveying run of the endless conveyor.
  • the conveyor conveys the signal devices up to the haulage compartment of the vehicle. With this arrangement the haulage vehicle straddles the newly painted lines and the signal devices positioned adjacent thereto and the magnetic member picks up the devices from the roadway as the magnetic device passes thereover.
  • My improved retriever is especially suitable to be used with metallic roadway signal devices as described and claimed in my patent entitled Signal Device," U.S. Patent No. 3,0l6,035 dated January 9, 1962. It should be understood that although my retriever is described heroin and illustrated retrieving signal devices similar to that disclosed in my Patent No. 3,016,035, my retriever device is also suitable for use with other types of metallic roadway signal devices.
  • the principal object of this invention is to provide a signal device retriever that picks up the signal devices over which it passes.
  • Another object of this invention is to provide a signal device retriever that has a magnetic member that picks up the signal devices and positions them on a conveyor.
  • FIGURE 1 is a perspective view of my retriever connected to a -haulage vehicle.
  • FIGURE 2 is a view in section illustrating my magnetic tail pulley and the guide means for the fiexible sta of the signal device.
  • FIGURE 3 is a top plan view of the guide member which deects the flexible stafi of the signal device.
  • FIGURE 4 is -a fragmentary top plan View of the conveyor and illustrates the laterally extending wings which direct the signal devices toward the tail pulley.
  • a haulage vehicle 12 has a haulage compartment 14 into which the signal devices are deposited.
  • the retriever 10 is connected to a trailer bitch '16 extending from the frame of vehicle '12.
  • l signal devices 18 similar to those illustrated and described in my Patent No. 3,0l6,035 are shown positioned on the road surface adjacent a newly painted line 20.
  • the -wheels of the truck 12 straddle both the painted line 20 and the signal devices 18 and as the truck 12 progresses' down the roadway the signal devices '18 are picked up by means of retriever 16 and deposited in the haulage compartment 14 of *truck 12.
  • the signal devices 18 have a base member 22 and a flexible stad portion 24 with a flag 26 secured thereto.
  • the flexible staff 24 may be *bent relative to the base 22, as is clearly described in my previously mentioned patent.
  • the retriever 10 has a frame 28 with suitable lateral cross members (not shown). Rotatably secured to the frame 28 adjacent one end is a head pulley 30. Wheels 32 and 34 are nonrotatably secured to an axle 36 and the axle 36 is, in turn, rotatably secured to an end portion of frame 28 in a conventional manner so that the wheels 32 and 34 and axle 36 are supported by frarne 23 and rotatable relative to the frame 28.
  • Nonrotatably secured to the axle 36 is a tail pulley 38 which is fabricated of a series of magnets longitudinally secured or embedded in the cylinder so that the outer surface of tail pulley 38 Will attract magnetic members as subsequently described.
  • an endless conveyor belt 40 Reeved around the head 'pulley 30 and the tail pulley 38 is an endless conveyor belt 40 which is fabricated of nonmagnetic material and preferably has corrugations 42 to provide an uneven or wafiie like outer surface so that the signal devices will not slide 'as they are conveyed thereon.
  • the endless belt 40 is maintained in tension between the head pulley 30 and tail pulley 38 by means of a suitable take-up device (not shown) that adjusts the head pulley 30 relative to tail pulley 38 and tensions the belt 49 therebetween.
  • the endless belt 40 defines 'a conveying run 44 and a return run 46.
  • the signal devices 18 are conveyed up the inclined conveying run 44, as later described.
  • a bracket 48 is rigidly secured to the sides of frame 28 and connecting members 52 and 54 depend therefrom.
  • the members 52 and 54 are preferably of tubular construction and portions of the trailer hitch 16 are inserted in the respective tubular members 52 and 54 and secured therein by means of bolts 56.
  • my retriever 10 is connected to the rear of vehicle 12 and is arranged to follow behind the vehicle 12 and st'addle both the newly painted line 20 and the signal devices 18.
  • a pair of side boards 60 and 62 are secured to the respective sides of frame 28 by means of brackets 64.
  • the side boards 60 and 62 are arranged to prevent the signal devices 18 from falling ofi the side of the endless belt 40 as they are conveyed upwardly to the vehicle haulage compartment 14.
  • Secured to the side Walls of frame member 28 are depending wings 66 and 68.
  • the wings 66 and 68 are spaced slightly above the road surface and serve to guide the signal devices 18 inwardly toward the tail pulley 38.
  • the side members of frame 28 have Secured thereto and depending therefrom a V shaped guide member 79 (see FIGURES 2 and 3) which is arranged to bend or deflect the flexible staff 24 of signal device 18 so that the metallic base 22 is pcked up by the tail pulley 38.
  • a chute 72 is 'Secured to a side wall of frame 28 and extends longitudinally therewith.
  • the chute 72 terminates adjacent the road surface and is used to convey signal operation
  • My improved roadway signal device retriever 10 operates as follows.
  • the retriever 10 is secured to the trailer hitch 16 and rear of vehicle 12 so that it follows essentially the same path as vehicle 12.
  • the tail pulley 38 being Secured to the live aXle 36 rotates at the same angular velocity as the wheels 32 and 34 and propels the belt 40 -around tail pulley 38 and head pulley 30.
  • the wings 66 and 68 direct the signal devices toward the under side of my retriever device 10 in proximity with the magnetic tail pulley 38.
  • the guide means 70 defiects the staff member 24 so that the metallic base member 22 passes under the tail pulley 38.
  • the tail pulley 38 due to the permanent magnets Secured to its cylindrical surface, picks up the signal device 18 by the base portion 22.
  • the signal device 18 adheres to the tail pulley 38 although the conveyor belt 40 is positioned therebetween.
  • the signal device 18 which adheres to the tail pulley 38 rotates about the axis of axle 36 with the tail pulley 38 until the signal device 18 is positioned on the conveying run 44 of conveyor belt 40. The signal device 18 is then disengaged from the magnetic tail pulley 38 and progresses up the inclined conveying run 44 and is discharged into the vehicle haulage compartment 14.
  • My improved signal device retriever It is apparent with my improved signal device retriever that it is now possible to retrieve metallic roadway signal devices without manually picking up the signal devices from the road surface and rnanually depositing them in the haulage compartment of a vehicle.
  • My improved signal device retriever is Secured to the rear portion of the vehicle and does not create any hazard to oncoming ve ⁇ hicles.
  • My improved signal device retriever also includes a means for easily and simply positioning the signal de- Vices at spaced intervals along a newly painted line on the road surface.
  • a method for retrieving metallic signal devices from 'a roadway surface which comprises the steps of,
  • a method for continuously retrieving metallic signa1 devices from a roadway surface which comprises the steps of,

Description

E. M. ASBURY 3,232,408
METHOD FOR RETRIEVING MAGNETIC ROADWAY SIGNAL DEVICES Feb. 1, 1966 Original Filed Oct. 5, 1962 IN V EN TOR.
[DW/%PD /ld 455050 Big United States Patent Ofiice &232,%8
Patented Feb. 1, 1966 3,232,408 MLETHOD FOR RETRIEVING MAGNETIC ROADWAY SIGNAL DEVTCES Edward M. Asbury, 450 Burton Drive, Pittsburgh, Pa. Original application Oct. 3, 1962, Ser. No. 228,()93, now Patent No. 3,157,267, dated Nov. 17, 1964. Dvided and this application Sept. 1, 1964, Ser. No. 393,706 The portion of the term of the patent subsequent to Nov. 17, 1981, has been disclaimed 2 Claims. (Cl. 198-7) This invention relates to a roadway signal device retriever and more particularly to a metallic roadway signal device retriever wherein metallic roadway signal devices are picked up from the road surface by a magnetic device and conveyed to a haulage vehicle.
This application is a division of my copending application Serial No. 228,093 filed October 3, 1962, now Patent No. 3,157,267.
Roadway sigral devices are used to alert motorists of recently painted lines on the roadway. The signal devices are positioned at spaced intervals on the road surface adjacent the newly painted lines and remain on the road surface until the paint has dried. Recent improvements in the method and apparatus for painting the lines on the road surface have increased the speed at which the paint is applied to the road surface. The method of positioning and retrieving the signal devices has not kept pace with these improvements.
Of more importance, however, is the manner in which the signal devices are now being picked up or retrieved from the road surface. The vehicle used to retrieve the signal devices has a platform extending laterally therefrom on which a workman is stationed. The platform is usually built close to the road surface and the vehicle is steered so that the workman can reach out and manually retrieve the signal devices.
This method of retrieving signal devices is extremely hazardous in that the workman stationed on the platform is not protected from oncoming vehicles and the laterally extending platform is an unnatural structure unfamiliar to the average motorist. There have been instances where the platform has been struck by oncoming vehicles and the workman either killed or seriously injured. With my roadway signal device retriever this unsafe practice of stationing a workman on the laterally extending platform is eliminated. In fact, with my retriever it is no longer necessary to require manual retrieving of the sigral devices.
Briefiy, my invention includes a retriever connected to the rear of a haulage vehicle. The retriever includes a magnetic member adjacent the road surface that picks up the metallic signal devices and deposits them on the upper conveying run of the endless conveyor. The conveyor conveys the signal devices up to the haulage compartment of the vehicle. With this arrangement the haulage vehicle straddles the newly painted lines and the signal devices positioned adjacent thereto and the magnetic member picks up the devices from the roadway as the magnetic device passes thereover.
My improved retriever is especially suitable to be used with metallic roadway signal devices as described and claimed in my patent entitled Signal Device," U.S. Patent No. 3,0l6,035 dated January 9, 1962. It should be understood that although my retriever is described heroin and illustrated retrieving signal devices similar to that disclosed in my Patent No. 3,016,035, my retriever device is also suitable for use with other types of metallic roadway signal devices.
Accordingly, the principal object of this invention is to provide a signal device retriever that picks up the signal devices over which it passes.
Another object of this invention is to provide a signal device retriever that has a magnetic member that picks up the signal devices and positions them on a conveyor.
The method and apparatus which comprise this invention accomplish the foregoing and other functions in a novel way as will now be explained. Further features, objects and advantages will either be specifically pointed out or become apparent when, for a better understanding of the invention, reference is made to the following written description, taken in conjunction with the accornpanying drawings which form a part hereof, and in which:
FIGURE 1 is a perspective view of my retriever connected to a -haulage vehicle.
FIGURE 2 is a view in section illustrating my magnetic tail pulley and the guide means for the fiexible sta of the signal device.
FIGURE 3 is a top plan view of the guide member which deects the flexible stafi of the signal device.
FIGURE 4 is -a fragmentary top plan View of the conveyor and illustrates the laterally extending wings which direct the signal devices toward the tail pulley.
Referrng to the drawings and particularly to FIGURE 1 there is illustrated my signal device retriever generally designated by the numeral 10. A haulage vehicle 12 has a haulage compartment 14 into which the signal devices are deposited.
The retriever 10 is connected to a trailer bitch '16 extending from the frame of vehicle '12. In FIGURE l signal devices 18 similar to those illustrated and described in my Patent No. 3,0l6,035 are shown positioned on the road surface adjacent a newly painted line 20. The -wheels of the truck 12 straddle both the painted line 20 and the signal devices 18 and as the truck 12 progresses' down the roadway the signal devices '18 are picked up by means of retriever 16 and deposited in the haulage compartment 14 of *truck 12.
The signal devices 18 have a base member 22 and a flexible stad portion 24 with a flag 26 secured thereto. The flexible staff 24 may be *bent relative to the base 22, as is clearly described in my previously mentioned patent.
The retriever 10 has a frame 28 with suitable lateral cross members (not shown). Rotatably secured to the frame 28 adjacent one end is a head pulley 30. Wheels 32 and 34 are nonrotatably secured to an axle 36 and the axle 36 is, in turn, rotatably secured to an end portion of frame 28 in a conventional manner so that the wheels 32 and 34 and axle 36 are supported by frarne 23 and rotatable relative to the frame 28.
Nonrotatably secured to the axle 36 is a tail pulley 38 which is fabricated of a series of magnets longitudinally secured or embedded in the cylinder so that the outer surface of tail pulley 38 Will attract magnetic members as subsequently described. Reeved around the head 'pulley 30 and the tail pulley 38 is an endless conveyor belt 40 which is fabricated of nonmagnetic material and preferably has corrugations 42 to provide an uneven or wafiie like outer surface so that the signal devices will not slide 'as they are conveyed thereon. The endless belt 40 is maintained in tension between the head pulley 30 and tail pulley 38 by means of a suitable take-up device (not shown) that adjusts the head pulley 30 relative to tail pulley 38 and tensions the belt 49 therebetween. The endless belt 40 defines 'a conveying run 44 and a return run 46. The signal devices 18 are conveyed up the inclined conveying run 44, as later described.
A bracket 48 is rigidly secured to the sides of frame 28 and connecting members 52 and 54 depend therefrom. The members 52 and 54 are preferably of tubular construction and portions of the trailer hitch 16 are inserted in the respective tubular members 52 and 54 and secured therein by means of bolts 56. In this manner my retriever 10 is connected to the rear of vehicle 12 and is arranged to follow behind the vehicle 12 and st'addle both the newly painted line 20 and the signal devices 18.
A pair of side boards 60 and 62 are secured to the respective sides of frame 28 by means of brackets 64. The side boards 60 and 62 are arranged to prevent the signal devices 18 from falling ofi the side of the endless belt 40 as they are conveyed upwardly to the vehicle haulage compartment 14. Secured to the side Walls of frame member 28 are depending wings 66 and 68. The wings 66 and 68 are spaced slightly above the road surface and serve to guide the signal devices 18 inwardly toward the tail pulley 38. The side members of frame 28 have Secured thereto and depending therefrom a V shaped guide member 79 (see FIGURES 2 and 3) which is arranged to bend or deflect the flexible staff 24 of signal device 18 so that the metallic base 22 is pcked up by the tail pulley 38.
A chute 72 is 'Secured to a side wall of frame 28 and extends longitudinally therewith. The chute 72 terminates adjacent the road surface and is used to convey signal operation My improved roadway signal device retriever 10 operates as follows. The retriever 10 is secured to the trailer hitch 16 and rear of vehicle 12 so that it follows essentially the same path as vehicle 12. As the vehicle 12 moves along the roadway the wheels 32 and 34 rotate at substantially the same angular velocity as the wheels of vehicle 12. The tail pulley 38 being Secured to the live aXle 36 rotates at the same angular velocity as the wheels 32 and 34 and propels the belt 40 -around tail pulley 38 and head pulley 30.
As the vehicle 12 straddles both the newly painted line 20 and signal devices 18 and progresses down the roadway, the wings 66 and 68 direct the signal devices toward the under side of my retriever device 10 in proximity with the magnetic tail pulley 38. The guide means 70 defiects the staff member 24 so that the metallic base member 22 passes under the tail pulley 38. The tail pulley 38, due to the permanent magnets Secured to its cylindrical surface, picks up the signal device 18 by the base portion 22. The signal device 18 adheres to the tail pulley 38 although the conveyor belt 40 is positioned therebetween. The signal device 18 which adheres to the tail pulley 38 rotates about the axis of axle 36 with the tail pulley 38 until the signal device 18 is positioned on the conveying run 44 of conveyor belt 40. The signal device 18 is then disengaged from the magnetic tail pulley 38 and progresses up the inclined conveying run 44 and is discharged into the vehicle haulage compartment 14.
It is apparent with my improved signal device retriever that it is now possible to retrieve metallic roadway signal devices without manually picking up the signal devices from the road surface and rnanually depositing them in the haulage compartment of a vehicle. My improved signal device retriever is Secured to the rear portion of the vehicle and does not create any hazard to oncoming ve` hicles. My improved signal device retriever also includes a means for easily and simply positioning the signal de- Vices at spaced intervals along a newly painted line on the road surface.
According to the provisions of the patent statutes, I have explained the principle, preferred Construction, and mode of operation of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.
I claim:
1. A method for retrieving metallic signal devices from 'a roadway surface which comprises the steps of,
passing over said metallic signal device with a rotating magnetic field, magnetically engaging said metallic signal device to a portion of said rotating magnetic field and lifting said metallic signal device from said roadway surface,
transporting said metallic signal device engaged to said rotating -magnetic field to a location spaced above the roadway surface, and
disengaging said metallic signal device from said rotating magnetic field at a location spaced above the roadway surface.
2. A method for continuously retrieving metallic signa1 devices from a roadway surface which comprises the steps of,
passing over said metallic signal device with a moving non-'magnetic conveying device, applying a moving magnetic force to said metallic signal device by a rotating magnetic field,
engaging said metallic signal device to a portion of said moving nonmagnetic -conveying device by the magnetic forces of said rotating magnetic field, lifting said metallic signal device from said roadway surface by the movement of said nonmagnetic con Veying device and the rotation of said magnetic field,
maintaining said metallic signal device engaged to said portion of said moving nonmagnetic conveying device by the magnetic forces of said rotating magnetic field while said metallic signal device is lifted to a location above the roadway surface, disengaging said metallic signal device from the magnetic forces of said rotating magnetic field and maintaining said metallic signal device in engagement with said portion of said moving nonmagnetic con- Veying device, and
thereafter conveying said metallic sign al device on said nonmagnetic conveying device to an elevated location above the roadway surface.
References Cited by the Examie' FOREIGN PATENTS 236,221 10/1925 Great Britain.
HUGO O. SCHULZ, Prmary Examner.
WILLIAM B. LA BORDE, SAMUEL F. COLEMAN,
Exam'ners.
RALPH E. KRISHER, Assistant Exam'ner.

Claims (1)

1. A METHOD FOR RETRIEVING METALLIC SIGNAL DEVICES FROM A ROADWAY SURFACE WHICH COMPRISES THE STEPS OF, PASSING OVER SAID METALLIC SIGNAL DEVICE WITH A ROTATING MAGNETIC FIELD, MAGNETICALLY ENGAGING SAID METALLIC SIGNAL DEVICE TO A PORTION OF SAID ROTATING MEGNETIC FIELD AND LIFTING SAID METALLIC SIGNAL DEVICE FROM SAID ROADWAY SURFACE, TRANSPORTING SAID METALLIC SIGNAL DEVICE ENGAGED TO SAID ROTATING MAGNETIC FIELD TO A LOCATION SPACED ABOVE THE ROADWAY SURFACE, AND DISENGAGING SAID METALLIC SIGNAL DEVICE FROM SAID ROTATING MAGNETIC FIELD AT A LOCATION SPACED ABOVE THE ROADWAY SURFACE.
US393706A 1962-10-03 1964-09-01 Method for retrieving magnetic roadway signal devices Expired - Lifetime US3232408A (en)

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US228093A US3157267A (en) 1962-10-03 1962-10-03 Roadway signal device retriever
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709360A (en) * 1971-01-15 1973-01-09 R Baker Mechanized collection of solid waste material
US3744164A (en) * 1970-04-17 1973-07-10 Dunlop Holdings Ltd Transportable conveyor for clearing surfaces
US5054648A (en) * 1990-01-23 1991-10-08 Luoma Eugene H Highway cone dispenser and collector
WO1994016150A1 (en) * 1993-01-07 1994-07-21 Gareth Ashby Bliss Apparatus for laying road cones
US20040159667A1 (en) * 2003-02-19 2004-08-19 Illinois Tool Works Inc. Temporary raised pavement marker (TRPM) applicator macihne for automatically applying pavement markers to road surfaces
US20060054461A1 (en) * 2004-08-31 2006-03-16 Jordan Alan L Cone collecting and laying apparatus
US20060147264A1 (en) * 2005-01-06 2006-07-06 Doran John T Jr Highway marker transfer vehicle
US10319227B2 (en) 2015-06-29 2019-06-11 Royal Truck & Equipment, Inc. Roadway work area safety truck
US10556545B2 (en) 2015-06-29 2020-02-11 Royal Truck & Equipment, Inc. Over-cab rack for traffic delineators
CN111335211A (en) * 2020-04-03 2020-06-26 安徽省徽腾智能交通科技有限公司 Automatic traffic cone taking and placing device based on intelligent transportation
US10801169B2 (en) 2015-06-29 2020-10-13 Royal Truck & Equipment, Inc Truck safety modules for assisting workpersons to place and retrieve traffic delineators
US11008717B2 (en) 2015-06-29 2021-05-18 Royal Truck & Equipment, Inc. Safety truck attachments, and methods of safety truck use

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB236221A (en) * 1924-06-26 1925-10-01 August Klein Improvements in feeding devices for elevators

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB236221A (en) * 1924-06-26 1925-10-01 August Klein Improvements in feeding devices for elevators

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744164A (en) * 1970-04-17 1973-07-10 Dunlop Holdings Ltd Transportable conveyor for clearing surfaces
US3709360A (en) * 1971-01-15 1973-01-09 R Baker Mechanized collection of solid waste material
US5054648A (en) * 1990-01-23 1991-10-08 Luoma Eugene H Highway cone dispenser and collector
US5213464A (en) * 1990-01-23 1993-05-25 Addco Manufacturing, Inc. Method and apparatus for dispensing and retrieving highway warning markers
WO1994016150A1 (en) * 1993-01-07 1994-07-21 Gareth Ashby Bliss Apparatus for laying road cones
US20040159667A1 (en) * 2003-02-19 2004-08-19 Illinois Tool Works Inc. Temporary raised pavement marker (TRPM) applicator macihne for automatically applying pavement markers to road surfaces
US7011328B2 (en) * 2003-02-19 2006-03-14 Illinois Tool Works Inc. Transversely extending pivotal hitch mechanism
US7581918B2 (en) 2004-08-31 2009-09-01 Alan L Jordan Cone collecting and laying apparatus
US20060054461A1 (en) * 2004-08-31 2006-03-16 Jordan Alan L Cone collecting and laying apparatus
US20060147264A1 (en) * 2005-01-06 2006-07-06 Doran John T Jr Highway marker transfer vehicle
US7306398B2 (en) * 2005-01-06 2007-12-11 Doran Jr John Terrence Highway marker transfer vehicle
US10319227B2 (en) 2015-06-29 2019-06-11 Royal Truck & Equipment, Inc. Roadway work area safety truck
US10556545B2 (en) 2015-06-29 2020-02-11 Royal Truck & Equipment, Inc. Over-cab rack for traffic delineators
US10801169B2 (en) 2015-06-29 2020-10-13 Royal Truck & Equipment, Inc Truck safety modules for assisting workpersons to place and retrieve traffic delineators
US11008717B2 (en) 2015-06-29 2021-05-18 Royal Truck & Equipment, Inc. Safety truck attachments, and methods of safety truck use
CN111335211A (en) * 2020-04-03 2020-06-26 安徽省徽腾智能交通科技有限公司 Automatic traffic cone taking and placing device based on intelligent transportation

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