CA2107774A1 - Road marking method - the appliation of rib pads - Google Patents
Road marking method - the appliation of rib padsInfo
- Publication number
- CA2107774A1 CA2107774A1 CA002107774A CA2107774A CA2107774A1 CA 2107774 A1 CA2107774 A1 CA 2107774A1 CA 002107774 A CA002107774 A CA 002107774A CA 2107774 A CA2107774 A CA 2107774A CA 2107774 A1 CA2107774 A1 CA 2107774A1
- Authority
- CA
- Canada
- Prior art keywords
- pads
- rib
- strip
- rumble strip
- pad
- 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.)
- Abandoned
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/16—Devices for marking-out, applying, or forming traffic or like markings on finished paving; Protecting fresh markings
- E01C23/18—Devices for marking-out, applying, or forming traffic or like markings on finished paving; Protecting fresh markings for applying prefabricated markings
-
- 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
- E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
- E01F9/553—Low discrete bodies, e.g. marking blocks, studs or flexible vehicle-striking members
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Signs Or Road Markings (AREA)
- Road Repair (AREA)
Abstract
2107774 9217648 PCTABS00016 The invention concerns a machine for putting down plastic strips or pads (40) in spaced array along a demarcation line of a road or motorway surface to provide a "rumble" strip for traffic. The machine also has a presser (34) for pressing the pads to the road surface to achieve good adhesion in that the pads are either applied to a newly laid white line whilst it is still soft, a previously laid white line on the road surface which has either been softened by heat or to which adhesive or soft plastics bonding material has been applied.
Description
WO92/17648 pcT/GBs2/oo61o 1 21~777~
Road Markin~_Method - The Application of Rib Pads :-~
This invention relates to a method of applying road markings to motorways, trunk roads and the like. Specifically the inven~ion is concerned with the application of rib pads to a road surface, such that the rib pads protrude above the road surfac~ and are applied at spaced intervals along a road.
The application of the said pads is performed by mechanical means such that the application can be accurately performed.
The purpose of such rib pads is, in combination, to cause a vibratory effect on a vehicle upon the vehicle wheels passing over the said rib pads. The rib pads protrude above the road surface and as such, in general terms, shall be evident above road surface water.
At present rib pads are applied to the road surface by means of a complicated and expensive vehicle which is required to lay down fluent and molten material to form a base strip on the æurface as the vehicle travels along the surface with the rib pad itself being formed of a similar material to that of the base strip. During the application, the strip pads are formed by a mechanical shutter mechanism which allows a blob of material to form on the strip. In this form the equipment for the application of the rib comprises a hopper for the material and a heating means. The molten material is applied to the road surface in the form of a base strip and a series of blobs.
' .
As a result of the formation of the ribs from the same material as the base strip and the simultaneous application of the base strip and the ribs, the machinery so described has the disadvantage of requiring the rib application to he performed at the same time as the base strip is laid. This has the effect of slowing down the application process when .
, . . , ...... , ., . ;. . , . - , , , 21~777~ 08 JUlY l993 the time allowed for the process is frequently limited by traffic flow constraints ie in the form of limitation of traffic congestion. Furthermore, if failure occurs in the operation of any part of the application machine, then it is difficult to continue the road marking operation until a ; replacement machine is available.
In addition the simultaneous application of base strip and ribs requires that the consistency of the material forming the strip and ribs be the same. This is wasteful as the composition of the ribs is normally required to be harder wearing than that of the base strip as it is the rib pads with which vehicle wheels are most in contact. Furthermore the vibration effect of a rumble strip is best achieved when the sides of the ribs are vertical. The present method is unable to achieve this as the hot material slumps causing the ribs to lose their definition.
~, The present invention aims in one aspect at the application of rib pads to a surface to form a rumble strip or demarcation strip wherein the pads are applied to a base strip in a molten state or to a road surface independently of a base strip and by an integrated reciprocal or rotary application method comprising placing and securing operations for the application of each rib pad. A further aim is to provide for the manufacture of rib pads such that they need not be manufactured from the same material as is the base strip and said rib pads need not be manufactured simultaneously with the base strip.
According to the present invention in a first aspect there is I provided apparatus for the provision of a rumble strip or demarcation line incorporating a plurality of rib pads on a ; road surface, said apparatus comprises a movable rib pad ~ laying unit and an integrated rib pad application means for .
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the laying of the rib pads wherein said application means is linked to the speed of movement of the unit and the distance required between each rib pad when laid.
.~ .
The three operations of heating, placing and securing of the rib pads so described shall be performed by the rib pad laying road unit in sequence such that the direction and speed of movement of the unit shall be continuous.
,' ~
In the invention the rib pad laying road unit will be capable of applying the rib pads at regular spaced intervals and said spaced intervals will be adjustable to suit the required Y spacing intervals.
.
The machine for the application of the pads will heat the surface to which the rib pads are to be applied by applying heat produced from gas burners mounted in close proximity to the said surface to a state of fluidity sufficient to accept therein the rib pads. :
..
In another embodiment, particularly suited for when the pads may lie at an angle after placing, the wheel will be replaced by a heating head which will heat the pad sufficiently that it will, in effect, form as one with the molten base surface.
'..
The device may in one embodiment be provided with apparatus for the application of a base strip to the road surface prior to the application of the rib pads into the base strip to form the rumble strip or demarcation line. The apparatus may also include a means for spraying reflective beads on to the demarcation line or rumble strip.
Typically the rib pads, prior to application will be held in a magazine and in one embodiment a plurality of said magazines will be provided. Additionally the application . I .
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, ~ .. . ~ ', ! ' ; ' ,: , "~ '' '.'' ' ' ' . ' ' ' , ' ' - ~ ' ' : . , m~c 2~ a7 4610 210777'1 ~8 JUlY 1993 means will comprise a feed wheel having peripheral pockets to receive the pads and deliver same, by rotation of the wheel to the road surface.
~, In one embodiment of the invention there will be provided apparatus such that the rib pads will be applied to a road 'i surface to form a demarcation line or rumble strip wherein said rib pad will be applied to a blob of material in a molten state applied to the road surface prior to the application of the rib pad;
i~
Preferably said rib pad will be applied to the blob of material and said rib pads and blobs of material will be oversprayed or painted with a largely continuous line of material to form a rumble strip.
.
Typically said blob of material will be molten plastic.
In a further embodiment there will be provided apparatus for the application of a layer of adhesive applied to the bottom of the rib pad such that when said rib pad is applied it will adhere to the road surface or base line to which it is applied.
~' Preferably said rib pad after application will be oversprayed with paint to form a rumble strip.
~he invention provide~ an application method wherein the rib pads are applied from a powered road unit capable of variable speed and which can be steered to follow a set path in which 3 the pad~ are to be laid. The i~itorage of rib pads, gas canisters for the burners and associated equipment can be transported on the application unit.
Asi an alternative to the powered road unit the rib pad will ', '' :
.
~ ~ ~ ~ SUB~t'~ J ~
0 8 JULY l993 210777~
., ; be laid by the means of a manually controlled rib pad laying unit wherein the said unit is manually controlled by an operator and the laying operations are controlled by means of mechanical actuation, as the said unit is pushed along.
In a further aspect of the invention there is provided a ~ method for producing a rumble strip comprising a continuous !' line incorporating a series of rib pads; applying a plurality of rib pads to a road surface, said pads provided at spaced intervals to form a demarcation line and said line is oversprayed or painted to form a rumble strip.
In one embodiment the pads are adhered to the road surface by means of an adhesive layer on the bottom of the pads or in a further embodiment the pads are adhered to the road surface by means of blobs of molten plastics material previously applied to the road surface.
In a further aspect of the invention said rib pads will be manufactured from a thermoplastics material remote from the laying of the rib pads and wherein said pads are manufactured from extruded lengths of thermoplastics material.
~ .
In the invention there is provided a rumble strip rib pad of thermoplastics material having a ligh reflective top surface provided by light reflective spheres embedded in the plastics.
, ~,.
Preferably there will be incorporated into the said manufacturing process the capability to apply reflective beads to the rib pads such that the reflective quality of the rib pads is enhanced thereby.
Preferably the said beads will be applied to the rib pads by [~d Kincd~ f~ce ¦ S) ~ 'W'~ ftl 5~
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` ` 210777~ 08 JUlY ~93 , 6 ~; The pads may be further reflectorised by the attachment of - reflective devices to the rib pads and preferably along the longitudinal edges of same.
Typically said rib pads will have reflective strips attached to the vertical edges of said strips.
Thermoplastic material of varied colours may be used in the manufacture of the said rib pads to suit the statutory road marking colours required.
Preferably the rib pad dimensions will be such that they can be laid on the base strip by the Rib Pad Laying Unit so .~ described.
Preferably the rib pads as manufactured will be of 4.5cm width and either 20cm, 15cm or lOcm in length.
In one embodiment the rib pads will be manufactured by the extrusion of lengths of thermoplastic material, the said .
lengths being subsequently cut to form the said rib pads of required dimension.
. :
As an alternative to cutting the said lengths of thermoplastic material it will be possible to control the flow of the extrusion of the thermoplastic material such that the material can be extruded in controlled lengths.
This embodiment will provide means whereby a shutter ;~ mechanism will control the length of the rib pad to be . produced, by controlling the length of each extruded part to match.
.~
Preferably the extruded material shall be laid in a molten state onto polypropylene film to protect the conveying sy~tem ~ d-~m P~ 0 ¦ s~ ~P.
,, .
Q 8 JVlY 1993 7 2 ~ ~ 7 ~ '( from damage.
The extruded material shall be cooled as quickly as possible from the molten form by means of a blast freezer or by the treating of said material with water.
-f In a further aspect of the invention there is shown the method of using rib pads with a soft bonding layer applied to the underside of the rib pads to compensate for irregularities in the road surface to which rib pads are to 3 be applied.
'i .
3 There may be provided in a further embodiment of the invention the use of rib pads with a soft bonding layer applied to the road surface to compensate for irregularities in the road surface.
Typically the bonding layer for use on the underside of the rib pads will be provided by the softening, with heat for example, of the underside of the pads.
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lUlY 1993 : 8 21~777~
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, wherein:-Figure 1 is a plan view of one embodiment of a rib pad layingroad unit;
Figure 2 is a rear end elevation of the road unit shown in Figure 1;
.
Figure 3 shows a perspective view of the rib pad depositing assembly and the rib pad roller;
Figure 4 is a plan of the central column of the rib pad t ~ ' .
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~ depositing assembly shown in Figure 3; ~ -. . ..
i Figure 5 shows another embodiment of a rib pad depositing assembly;
.~ .
Figure 6 shows a rib pad laying unit of a further embodiment;
Figure 7 is a plan view of one embodiment of the rib pad manufcturing plant; and Figure 8 is a elevation of another embodiment of the rib pad manufacturing plant.
;.
With reference to the drawings and in the first instance to Figures 1 and 2 there is shown a road unit 2 from which the rib pad laying operation is performed. The unit 2 is a four vehicle having four wheels 4 and comprises a driver seating area 6, a fuel tank 8, gas canisters storage area 10, a tool box 12, work table 14, work platform 16 and a rib pad storage area 18. On one 22 of the edges 20 and 22 running longitudinally of the road unit 2 there is mounted the rib pad laying equipment 24.
. The rib pad laying equipment 24 comprises a burner section 26 which consists of a series of gas burners 28. A depositing assembly 32 is mounted behind the burner section 26 in relation to the direction of travel 30 of the road unit 2 and is followed by a presser roller 34 for applied rib pads.
3 To increase the visibility and safety of the road unit 2 the I rear of the road unit 2 is equipped with flasher lights 36 and has the capability of having hazard signs 38 fitted thereon.
!
The depositing aosembly 32 is shown in greater detai1 in ... ........ .. . . . ....... . . . . . .
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W092/17~8 PCT/CB92/00610 2107774 lO
Figures 3 and 4 and comprises a central column 42 in which the rib pads 40 are contained. Column 42 formed of two U-sectioned bars 44 and 46. To accomodate different sized rib pads 40 spacers 48 (as shown in Fig 4) can be placed inside the column along with the said pads when loading the central column 42. At the bottom 50 of the central column 42 a slot 52 therein allows one rib pad 40 at a tLme to be pushed by a mechanism 54 in the direction 56 onto a spring flap 58 held normally in a horizontal position by spring 60.
,1 In the order to lay the rib pads 40 the unit 2 is driven at a speed, approximately l mile per hour, and on a path such that the road laying equipment 24 is positioned above that line on road on which the rib pads 40 are to be laid. With the road unit 2 driven in the direction 30 shown, the burner section 26 supplied by gas from tanks lO serves to melt the road surface immediately below the burners so that the surface melts which allows the rib pad 40 subsequently to be pres~ed therein. The rib pads are deposited by depositing assembly 32 Each rib pad is deposited by means of the pad having been pushed by mechanism 54 to reach a position 62 on the spring flap 58 and the holding force of the spring 60 is overcome by the returning action of the mechanism 54 which is connected to the said flap.This causes the flap to lower into the position shown by the broken lines 64 and allows the rib pad 40 to slide into position on the molten surface. The frequency of depositing the rib pads 40 on the surface is dependant on the frequency of reciprocation of the mechanism 54. The reciprocatory movement is controlled by a linkage geared to the engine of the road unit 2. The spacing of the rib pads 40 along the road is dependent upon the speed of the unit 2 and the frequency of reciprocation of the mechanism 54.
When in postion on the surface, each rib pad 40 is pressed :
- WO92/17~8 PCT/GB92/00610 11 21~7~
.
into the soft, heated road surface by the pad roller 34.
Roller 34 passes over the said pad as the road unit 2 continues in direction 30~ Instead of a pressing roller 34, a pressing spider wheel may be used comprising radial arms each with a pressing bar on its extremity. The spider wheel rotates in synchranism with the laying of the pads so that each presser bar in turn comes down onto and presses a previously applied pad.
~"
The pad laying process of heating, placing and pressing is repeatedly and continuously performed as the said road unit continues in the direction 30, with the depositing assembly 32 being refilled with rib pads 40 when required by an operative on the road unit 2. Instead of the burners 28, column 32 and the presser being on a dedicated machine it may be connected to a conventional vehicle such as a lorry.
i~
In another embodiment as shown in Fig 5 the depositing assembly 32 consists of the mechanism 54 and the central column 42 as described previously. The spring flap 58 and spring 60 are omitted. The rib pads 40 are held in the central column 42 which as before has a slot 52 formed therein. The central column 32 is mounted at such an angle that the rib pads 40 are held in position so that the bottom rib pad 40 will not leave the central column 52 until pushed by mechanism 54 and when it is so pushed, it falls freely and predictably to the ground.
In a further embodiment,the rib pad roller 34 may be removed and replaced by a heater head. In this embodiment once the rib pad 40 has been placed in position by the depositing assembly 32, it is heated by the heater head such that the rib pad melts sufficiently to allow a bond to be formed with the heated surface upon which it is laid. This prevents the pad ~rc~ cracking due to the pad roller 34 passing over and ,~,, ,, .. , ~,, , , . ~ ......... .. . . . .
WO92/17~X 210 7 ~ 7 '~ PCT/GB92/00610 especially when applied to uneven surfaces.
., Instead of the pads being displaced from the magazine 32 by a reciprocating mechanism, they may be fed to a feed wheel having peripheral notches into which the pads are placed one by one, and as the process proceeds the wheel is rotated and carries the pads round the wheel one by one and presents them to the road surface. This can be used in any embodiment.
'.
In further embodLments (not shown) the rib pad laying unit will be provided with means whereby a base strip can be laid onto the road surface prior to the rib pad application process. Typically this will involve the removal of the burner section 26 and replacement with a base line point application means.
Figure 6 illustrates a rib pad laying unit wherein the burner section 26 and the roller 34 have been removed. The roller 34 has been replaced by a bead spraying mechanism 66 thereby illustrating the adaptability of the rib pad laying unit.
Referring now to Figure 7 and 8 there is provided a manufacturing line 68 for the manufacture of rib pads 40 to be applied to a base strip on a road surface. To produce the said rib pads 40 there is provided at one end of the manufacturing line 68, a hopper 70 in which the raw thermoplastic material 72 is placed. Adjacent the hopper 70 there are boilers 74 and leading therefrom is an extruder 76 of a worm screw variety 78. Directly below the extruder 76 there is a first conveyor system 80 and laid thereon is a polypropylene film 82. Adjacent the extruder 76 there is mounted a pressurised bead pot 84 which is connected to a bead spray arm 86 mounted above the said conveyor. At the end of the first conveyor system 80 there is mounted a vertical cutter 88. A second conveyor system 90 leads from s. - , . , ,. , , . ~ . ,. . ,. , , , : : .. : .. .. ..
WO92~17648 PCT/GB92/00610 13 21Q777~
the said cutter at the end of which there may be provided a collecting hopper (not shown).
The manufacturing procedure co~mences with the transferral of the said thermoplastic raw material 72 from the hopper 70 into the boilers 74 wherein the material is transformed by heating into a molten state. Exits 92 from the boilers 74 release the molten material into the extruder 76 which feeds -the molten material onto the polypropylene film 82 on the first conveyor system 80. The material is extruded in a thin strip of width such that the required length of rib pad will be so formed. The material in molten state is conveyed in direction 94 where it passes under the bead spray arm 86 from which the beads are impact sprayed such that they bond with the said molten material. As the material is conveyed it is quickly cooled and as it passes to the cutter 88 it is an almost solid state. The cutter 88 reciprocally cuts the material to form rib pads 96 as shown. The said rib pads are further cooled on the second conveyor system, are removed from the said polypropylene film and are collected prior to being shipped for the subsequent application to base strips, or road surfaces.
There may also be provided as part of the manufacturing line at least one blast freezer or water cooling system to ihcrease the rate of cooling of the extruded material such that the material properties are as desired for the remaining spraying and cutting operations.
It may also be desired that the application of the reflective beads may be applied after the rib pads have been cut to shape such that the edges of the said rib pads may also be coated with the said beads.
The pads can be further reflectorised by reflective devices W092/17~8 PCT/CB92/0~10 21 0 777~ 14 ; such as for example reflective tape or plastic reflectors, being placed, stuck or embedded into the longitudinal edges , of the pads. The said reflective devices may be protected by a layer of hard wearing plastic film.
Coloured thermoplastic material may be used for or with the ~, pad. Thus the pad may be formed wholly of the coloured j! thermoplastic material or may have a strip of the said material bonded thereto. The coloured edges can thus be placed facing towards the motorist for maximum reflectivity and warning.
fj Shown in Figure 8 is an alternative pad making plant wherein the cutter 88 is omitted and there is provided a shutter mechanism 98 fitted to the extruder 76. The shutter mechanism can be controlled to produce extruded lengths to match required width or length of rib pads thereby alleviating the need for the cutter 88.
The three operations of heating, placing and securing may be performed by the means of a manually controlled and propelled rib pad laying road unit. Integral to this unit in one embodiment will be a means for heating the base strip and a manually controlled lever application mechanism whereby the rib pad can be laid on the road surface as the road unit is propelled along the road surface. The effect of the said three operations are similar to that provided by the powered road unit. The manually controlled road unit may be especially suited to operations which require increased manouevrability or involve only small stretches of rib pad laying.
1- ..
The mechanism for dispensing the pads can be attached to existing screed, spray and extruding machinery so that pads can be laid directly on to newly applied base lines whilst WO92/17~8 PCT/GB92/00610
Road Markin~_Method - The Application of Rib Pads :-~
This invention relates to a method of applying road markings to motorways, trunk roads and the like. Specifically the inven~ion is concerned with the application of rib pads to a road surface, such that the rib pads protrude above the road surfac~ and are applied at spaced intervals along a road.
The application of the said pads is performed by mechanical means such that the application can be accurately performed.
The purpose of such rib pads is, in combination, to cause a vibratory effect on a vehicle upon the vehicle wheels passing over the said rib pads. The rib pads protrude above the road surface and as such, in general terms, shall be evident above road surface water.
At present rib pads are applied to the road surface by means of a complicated and expensive vehicle which is required to lay down fluent and molten material to form a base strip on the æurface as the vehicle travels along the surface with the rib pad itself being formed of a similar material to that of the base strip. During the application, the strip pads are formed by a mechanical shutter mechanism which allows a blob of material to form on the strip. In this form the equipment for the application of the rib comprises a hopper for the material and a heating means. The molten material is applied to the road surface in the form of a base strip and a series of blobs.
' .
As a result of the formation of the ribs from the same material as the base strip and the simultaneous application of the base strip and the ribs, the machinery so described has the disadvantage of requiring the rib application to he performed at the same time as the base strip is laid. This has the effect of slowing down the application process when .
, . . , ...... , ., . ;. . , . - , , , 21~777~ 08 JUlY l993 the time allowed for the process is frequently limited by traffic flow constraints ie in the form of limitation of traffic congestion. Furthermore, if failure occurs in the operation of any part of the application machine, then it is difficult to continue the road marking operation until a ; replacement machine is available.
In addition the simultaneous application of base strip and ribs requires that the consistency of the material forming the strip and ribs be the same. This is wasteful as the composition of the ribs is normally required to be harder wearing than that of the base strip as it is the rib pads with which vehicle wheels are most in contact. Furthermore the vibration effect of a rumble strip is best achieved when the sides of the ribs are vertical. The present method is unable to achieve this as the hot material slumps causing the ribs to lose their definition.
~, The present invention aims in one aspect at the application of rib pads to a surface to form a rumble strip or demarcation strip wherein the pads are applied to a base strip in a molten state or to a road surface independently of a base strip and by an integrated reciprocal or rotary application method comprising placing and securing operations for the application of each rib pad. A further aim is to provide for the manufacture of rib pads such that they need not be manufactured from the same material as is the base strip and said rib pads need not be manufactured simultaneously with the base strip.
According to the present invention in a first aspect there is I provided apparatus for the provision of a rumble strip or demarcation line incorporating a plurality of rib pads on a ; road surface, said apparatus comprises a movable rib pad ~ laying unit and an integrated rib pad application means for .
SUBS~TU~E S~R
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the laying of the rib pads wherein said application means is linked to the speed of movement of the unit and the distance required between each rib pad when laid.
.~ .
The three operations of heating, placing and securing of the rib pads so described shall be performed by the rib pad laying road unit in sequence such that the direction and speed of movement of the unit shall be continuous.
,' ~
In the invention the rib pad laying road unit will be capable of applying the rib pads at regular spaced intervals and said spaced intervals will be adjustable to suit the required Y spacing intervals.
.
The machine for the application of the pads will heat the surface to which the rib pads are to be applied by applying heat produced from gas burners mounted in close proximity to the said surface to a state of fluidity sufficient to accept therein the rib pads. :
..
In another embodiment, particularly suited for when the pads may lie at an angle after placing, the wheel will be replaced by a heating head which will heat the pad sufficiently that it will, in effect, form as one with the molten base surface.
'..
The device may in one embodiment be provided with apparatus for the application of a base strip to the road surface prior to the application of the rib pads into the base strip to form the rumble strip or demarcation line. The apparatus may also include a means for spraying reflective beads on to the demarcation line or rumble strip.
Typically the rib pads, prior to application will be held in a magazine and in one embodiment a plurality of said magazines will be provided. Additionally the application . I .
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, ~ .. . ~ ', ! ' ; ' ,: , "~ '' '.'' ' ' ' . ' ' ' , ' ' - ~ ' ' : . , m~c 2~ a7 4610 210777'1 ~8 JUlY 1993 means will comprise a feed wheel having peripheral pockets to receive the pads and deliver same, by rotation of the wheel to the road surface.
~, In one embodiment of the invention there will be provided apparatus such that the rib pads will be applied to a road 'i surface to form a demarcation line or rumble strip wherein said rib pad will be applied to a blob of material in a molten state applied to the road surface prior to the application of the rib pad;
i~
Preferably said rib pad will be applied to the blob of material and said rib pads and blobs of material will be oversprayed or painted with a largely continuous line of material to form a rumble strip.
.
Typically said blob of material will be molten plastic.
In a further embodiment there will be provided apparatus for the application of a layer of adhesive applied to the bottom of the rib pad such that when said rib pad is applied it will adhere to the road surface or base line to which it is applied.
~' Preferably said rib pad after application will be oversprayed with paint to form a rumble strip.
~he invention provide~ an application method wherein the rib pads are applied from a powered road unit capable of variable speed and which can be steered to follow a set path in which 3 the pad~ are to be laid. The i~itorage of rib pads, gas canisters for the burners and associated equipment can be transported on the application unit.
Asi an alternative to the powered road unit the rib pad will ', '' :
.
~ ~ ~ ~ SUB~t'~ J ~
0 8 JULY l993 210777~
., ; be laid by the means of a manually controlled rib pad laying unit wherein the said unit is manually controlled by an operator and the laying operations are controlled by means of mechanical actuation, as the said unit is pushed along.
In a further aspect of the invention there is provided a ~ method for producing a rumble strip comprising a continuous !' line incorporating a series of rib pads; applying a plurality of rib pads to a road surface, said pads provided at spaced intervals to form a demarcation line and said line is oversprayed or painted to form a rumble strip.
In one embodiment the pads are adhered to the road surface by means of an adhesive layer on the bottom of the pads or in a further embodiment the pads are adhered to the road surface by means of blobs of molten plastics material previously applied to the road surface.
In a further aspect of the invention said rib pads will be manufactured from a thermoplastics material remote from the laying of the rib pads and wherein said pads are manufactured from extruded lengths of thermoplastics material.
~ .
In the invention there is provided a rumble strip rib pad of thermoplastics material having a ligh reflective top surface provided by light reflective spheres embedded in the plastics.
, ~,.
Preferably there will be incorporated into the said manufacturing process the capability to apply reflective beads to the rib pads such that the reflective quality of the rib pads is enhanced thereby.
Preferably the said beads will be applied to the rib pads by [~d Kincd~ f~ce ¦ S) ~ 'W'~ ftl 5~
, ,~ .
. . . .: .. .
-J
` ` 210777~ 08 JUlY ~93 , 6 ~; The pads may be further reflectorised by the attachment of - reflective devices to the rib pads and preferably along the longitudinal edges of same.
Typically said rib pads will have reflective strips attached to the vertical edges of said strips.
Thermoplastic material of varied colours may be used in the manufacture of the said rib pads to suit the statutory road marking colours required.
Preferably the rib pad dimensions will be such that they can be laid on the base strip by the Rib Pad Laying Unit so .~ described.
Preferably the rib pads as manufactured will be of 4.5cm width and either 20cm, 15cm or lOcm in length.
In one embodiment the rib pads will be manufactured by the extrusion of lengths of thermoplastic material, the said .
lengths being subsequently cut to form the said rib pads of required dimension.
. :
As an alternative to cutting the said lengths of thermoplastic material it will be possible to control the flow of the extrusion of the thermoplastic material such that the material can be extruded in controlled lengths.
This embodiment will provide means whereby a shutter ;~ mechanism will control the length of the rib pad to be . produced, by controlling the length of each extruded part to match.
.~
Preferably the extruded material shall be laid in a molten state onto polypropylene film to protect the conveying sy~tem ~ d-~m P~ 0 ¦ s~ ~P.
,, .
Q 8 JVlY 1993 7 2 ~ ~ 7 ~ '( from damage.
The extruded material shall be cooled as quickly as possible from the molten form by means of a blast freezer or by the treating of said material with water.
-f In a further aspect of the invention there is shown the method of using rib pads with a soft bonding layer applied to the underside of the rib pads to compensate for irregularities in the road surface to which rib pads are to 3 be applied.
'i .
3 There may be provided in a further embodiment of the invention the use of rib pads with a soft bonding layer applied to the road surface to compensate for irregularities in the road surface.
Typically the bonding layer for use on the underside of the rib pads will be provided by the softening, with heat for example, of the underside of the pads.
~ !? ~
~"" ' " ' ; ~ '' ;f~ ~ ' i ... ..,,, , "~, ,",, ,,~,,, ~,", " " ~,..; ,.,~, ~", ". ~,,..~,, ,", , ,~, , ",...
B Y t'~ / -O '~
lUlY 1993 : 8 21~777~
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, wherein:-Figure 1 is a plan view of one embodiment of a rib pad layingroad unit;
Figure 2 is a rear end elevation of the road unit shown in Figure 1;
.
Figure 3 shows a perspective view of the rib pad depositing assembly and the rib pad roller;
Figure 4 is a plan of the central column of the rib pad t ~ ' .
:
I United Kin~dom P.~ r~
. . ~
" , . ,. -.. . . . .. , . - . ~,. . ., .; . ~ . ,.: . ; ~ , ,, W092~17648 PCT/GB92/00610 9 21~777'~
,.
~ depositing assembly shown in Figure 3; ~ -. . ..
i Figure 5 shows another embodiment of a rib pad depositing assembly;
.~ .
Figure 6 shows a rib pad laying unit of a further embodiment;
Figure 7 is a plan view of one embodiment of the rib pad manufcturing plant; and Figure 8 is a elevation of another embodiment of the rib pad manufacturing plant.
;.
With reference to the drawings and in the first instance to Figures 1 and 2 there is shown a road unit 2 from which the rib pad laying operation is performed. The unit 2 is a four vehicle having four wheels 4 and comprises a driver seating area 6, a fuel tank 8, gas canisters storage area 10, a tool box 12, work table 14, work platform 16 and a rib pad storage area 18. On one 22 of the edges 20 and 22 running longitudinally of the road unit 2 there is mounted the rib pad laying equipment 24.
. The rib pad laying equipment 24 comprises a burner section 26 which consists of a series of gas burners 28. A depositing assembly 32 is mounted behind the burner section 26 in relation to the direction of travel 30 of the road unit 2 and is followed by a presser roller 34 for applied rib pads.
3 To increase the visibility and safety of the road unit 2 the I rear of the road unit 2 is equipped with flasher lights 36 and has the capability of having hazard signs 38 fitted thereon.
!
The depositing aosembly 32 is shown in greater detai1 in ... ........ .. . . . ....... . . . . . .
~ ,. ' '', ' . "
... . ~ .. . ~
W092/17~8 PCT/CB92/00610 2107774 lO
Figures 3 and 4 and comprises a central column 42 in which the rib pads 40 are contained. Column 42 formed of two U-sectioned bars 44 and 46. To accomodate different sized rib pads 40 spacers 48 (as shown in Fig 4) can be placed inside the column along with the said pads when loading the central column 42. At the bottom 50 of the central column 42 a slot 52 therein allows one rib pad 40 at a tLme to be pushed by a mechanism 54 in the direction 56 onto a spring flap 58 held normally in a horizontal position by spring 60.
,1 In the order to lay the rib pads 40 the unit 2 is driven at a speed, approximately l mile per hour, and on a path such that the road laying equipment 24 is positioned above that line on road on which the rib pads 40 are to be laid. With the road unit 2 driven in the direction 30 shown, the burner section 26 supplied by gas from tanks lO serves to melt the road surface immediately below the burners so that the surface melts which allows the rib pad 40 subsequently to be pres~ed therein. The rib pads are deposited by depositing assembly 32 Each rib pad is deposited by means of the pad having been pushed by mechanism 54 to reach a position 62 on the spring flap 58 and the holding force of the spring 60 is overcome by the returning action of the mechanism 54 which is connected to the said flap.This causes the flap to lower into the position shown by the broken lines 64 and allows the rib pad 40 to slide into position on the molten surface. The frequency of depositing the rib pads 40 on the surface is dependant on the frequency of reciprocation of the mechanism 54. The reciprocatory movement is controlled by a linkage geared to the engine of the road unit 2. The spacing of the rib pads 40 along the road is dependent upon the speed of the unit 2 and the frequency of reciprocation of the mechanism 54.
When in postion on the surface, each rib pad 40 is pressed :
- WO92/17~8 PCT/GB92/00610 11 21~7~
.
into the soft, heated road surface by the pad roller 34.
Roller 34 passes over the said pad as the road unit 2 continues in direction 30~ Instead of a pressing roller 34, a pressing spider wheel may be used comprising radial arms each with a pressing bar on its extremity. The spider wheel rotates in synchranism with the laying of the pads so that each presser bar in turn comes down onto and presses a previously applied pad.
~"
The pad laying process of heating, placing and pressing is repeatedly and continuously performed as the said road unit continues in the direction 30, with the depositing assembly 32 being refilled with rib pads 40 when required by an operative on the road unit 2. Instead of the burners 28, column 32 and the presser being on a dedicated machine it may be connected to a conventional vehicle such as a lorry.
i~
In another embodiment as shown in Fig 5 the depositing assembly 32 consists of the mechanism 54 and the central column 42 as described previously. The spring flap 58 and spring 60 are omitted. The rib pads 40 are held in the central column 42 which as before has a slot 52 formed therein. The central column 32 is mounted at such an angle that the rib pads 40 are held in position so that the bottom rib pad 40 will not leave the central column 52 until pushed by mechanism 54 and when it is so pushed, it falls freely and predictably to the ground.
In a further embodiment,the rib pad roller 34 may be removed and replaced by a heater head. In this embodiment once the rib pad 40 has been placed in position by the depositing assembly 32, it is heated by the heater head such that the rib pad melts sufficiently to allow a bond to be formed with the heated surface upon which it is laid. This prevents the pad ~rc~ cracking due to the pad roller 34 passing over and ,~,, ,, .. , ~,, , , . ~ ......... .. . . . .
WO92/17~X 210 7 ~ 7 '~ PCT/GB92/00610 especially when applied to uneven surfaces.
., Instead of the pads being displaced from the magazine 32 by a reciprocating mechanism, they may be fed to a feed wheel having peripheral notches into which the pads are placed one by one, and as the process proceeds the wheel is rotated and carries the pads round the wheel one by one and presents them to the road surface. This can be used in any embodiment.
'.
In further embodLments (not shown) the rib pad laying unit will be provided with means whereby a base strip can be laid onto the road surface prior to the rib pad application process. Typically this will involve the removal of the burner section 26 and replacement with a base line point application means.
Figure 6 illustrates a rib pad laying unit wherein the burner section 26 and the roller 34 have been removed. The roller 34 has been replaced by a bead spraying mechanism 66 thereby illustrating the adaptability of the rib pad laying unit.
Referring now to Figure 7 and 8 there is provided a manufacturing line 68 for the manufacture of rib pads 40 to be applied to a base strip on a road surface. To produce the said rib pads 40 there is provided at one end of the manufacturing line 68, a hopper 70 in which the raw thermoplastic material 72 is placed. Adjacent the hopper 70 there are boilers 74 and leading therefrom is an extruder 76 of a worm screw variety 78. Directly below the extruder 76 there is a first conveyor system 80 and laid thereon is a polypropylene film 82. Adjacent the extruder 76 there is mounted a pressurised bead pot 84 which is connected to a bead spray arm 86 mounted above the said conveyor. At the end of the first conveyor system 80 there is mounted a vertical cutter 88. A second conveyor system 90 leads from s. - , . , ,. , , . ~ . ,. . ,. , , , : : .. : .. .. ..
WO92~17648 PCT/GB92/00610 13 21Q777~
the said cutter at the end of which there may be provided a collecting hopper (not shown).
The manufacturing procedure co~mences with the transferral of the said thermoplastic raw material 72 from the hopper 70 into the boilers 74 wherein the material is transformed by heating into a molten state. Exits 92 from the boilers 74 release the molten material into the extruder 76 which feeds -the molten material onto the polypropylene film 82 on the first conveyor system 80. The material is extruded in a thin strip of width such that the required length of rib pad will be so formed. The material in molten state is conveyed in direction 94 where it passes under the bead spray arm 86 from which the beads are impact sprayed such that they bond with the said molten material. As the material is conveyed it is quickly cooled and as it passes to the cutter 88 it is an almost solid state. The cutter 88 reciprocally cuts the material to form rib pads 96 as shown. The said rib pads are further cooled on the second conveyor system, are removed from the said polypropylene film and are collected prior to being shipped for the subsequent application to base strips, or road surfaces.
There may also be provided as part of the manufacturing line at least one blast freezer or water cooling system to ihcrease the rate of cooling of the extruded material such that the material properties are as desired for the remaining spraying and cutting operations.
It may also be desired that the application of the reflective beads may be applied after the rib pads have been cut to shape such that the edges of the said rib pads may also be coated with the said beads.
The pads can be further reflectorised by reflective devices W092/17~8 PCT/CB92/0~10 21 0 777~ 14 ; such as for example reflective tape or plastic reflectors, being placed, stuck or embedded into the longitudinal edges , of the pads. The said reflective devices may be protected by a layer of hard wearing plastic film.
Coloured thermoplastic material may be used for or with the ~, pad. Thus the pad may be formed wholly of the coloured j! thermoplastic material or may have a strip of the said material bonded thereto. The coloured edges can thus be placed facing towards the motorist for maximum reflectivity and warning.
fj Shown in Figure 8 is an alternative pad making plant wherein the cutter 88 is omitted and there is provided a shutter mechanism 98 fitted to the extruder 76. The shutter mechanism can be controlled to produce extruded lengths to match required width or length of rib pads thereby alleviating the need for the cutter 88.
The three operations of heating, placing and securing may be performed by the means of a manually controlled and propelled rib pad laying road unit. Integral to this unit in one embodiment will be a means for heating the base strip and a manually controlled lever application mechanism whereby the rib pad can be laid on the road surface as the road unit is propelled along the road surface. The effect of the said three operations are similar to that provided by the powered road unit. The manually controlled road unit may be especially suited to operations which require increased manouevrability or involve only small stretches of rib pad laying.
1- ..
The mechanism for dispensing the pads can be attached to existing screed, spray and extruding machinery so that pads can be laid directly on to newly applied base lines whilst WO92/17~8 PCT/GB92/00610
2 1 ~ 7 7 ~1 the material is still molten, thus alleviating the need for heating up of the base line.
This unit has the advantage of providing, in one integral unit, a method of laying the said rib pads wherein the operations of heating, laying and pressing are part of one linked system with a comparatively high degree of automation which ensures that the rib pads 40 are laid in a systematic and efficient manner without the requirement for a I simultaneously laid base strip.
!
The rib pad laying road unit allows rib pads 40 of varying sizes to be laid independently of the laying of any base strip as is required by existing methods. This will allow the said rib pad laying to be performed more quickly and traffic congestion will be minimised and thus greater flexibility in the planning of a rib pad laying process is provided.
I
The safety of the operatives is greatly increased by this rib pad laying unit as it allows the operatives to operate from the vehicle itself which is equipped with hazard signs and affords the said operators a degree of protection against collision with any other vehicle.
Furthermore, the ability to lay the rib pads to the road surface and then overspray allows the rib pads to be located as an integral part of a rumble strip whilst maintaining the flexibility of the rib pad laying mechanism.
The ability to provide preformed, reflectorised rib pads, manufactured remote from the point of application to the road surface or base line provides a pad which is adaptable and flexible in use to form a demarcation line or rumble strip.
:
-Wo92/17~8 PCT/GB92/0~10 2 1 ~ 7 r~
The apparatus and method according to the invention in itsvarious embodiments can be used for the creation of rumble strips in various circumstances as follows.
Firstly, when the line of the road along which the pads are to be provided has no existing white line and none is to be provided before the pads are applied, the pads may be applied by heating and softening the road surface as described followed by application of the pads to he heated surface.
~he pads will mainly be of the rigid type described, but could be portions of molten material which subsequently hardens. Alternatively the pads may stick to the road surface with adhesive, such as pressure sensitive adhesive on the underside of the pads. After the pads have been applied, a strip of molten white lining material may be applied over the pads so that a rumble strip continuous white line is formed.
Where the road surface along the line where the rumble strip has to be formed already has a white line, this may be softened by heat and the pads applied to the softened material before it re-hardens. Again, the pads may be rigid components or may be applied as molten portions. Another possibility is that the pads (rigid) can be stuck to the white line using adhesive.
Where there i8 no white line, but one is to be provided, this may be applied as described herein by applying the molten material to the road surface to form the strip, followed by the application of the pads (rigid) whilst the strip is still warm and soft.
Again it i8 possible to apply a further strip of white lining over the applied pads.
.. ..
WO92/17~8 21 o 7 7 7 ~ PCT/GB92/00610 In all cases where rigid pads are used, they are preferably pressed downwards onto the receiving surface after application.
Any feature of any rib pad laying apparatus described herein ~ can where appropriate be used in combination with any other s, feature of that apparatus or any other such apparatus ~, described herein.
:
t~
This unit has the advantage of providing, in one integral unit, a method of laying the said rib pads wherein the operations of heating, laying and pressing are part of one linked system with a comparatively high degree of automation which ensures that the rib pads 40 are laid in a systematic and efficient manner without the requirement for a I simultaneously laid base strip.
!
The rib pad laying road unit allows rib pads 40 of varying sizes to be laid independently of the laying of any base strip as is required by existing methods. This will allow the said rib pad laying to be performed more quickly and traffic congestion will be minimised and thus greater flexibility in the planning of a rib pad laying process is provided.
I
The safety of the operatives is greatly increased by this rib pad laying unit as it allows the operatives to operate from the vehicle itself which is equipped with hazard signs and affords the said operators a degree of protection against collision with any other vehicle.
Furthermore, the ability to lay the rib pads to the road surface and then overspray allows the rib pads to be located as an integral part of a rumble strip whilst maintaining the flexibility of the rib pad laying mechanism.
The ability to provide preformed, reflectorised rib pads, manufactured remote from the point of application to the road surface or base line provides a pad which is adaptable and flexible in use to form a demarcation line or rumble strip.
:
-Wo92/17~8 PCT/GB92/0~10 2 1 ~ 7 r~
The apparatus and method according to the invention in itsvarious embodiments can be used for the creation of rumble strips in various circumstances as follows.
Firstly, when the line of the road along which the pads are to be provided has no existing white line and none is to be provided before the pads are applied, the pads may be applied by heating and softening the road surface as described followed by application of the pads to he heated surface.
~he pads will mainly be of the rigid type described, but could be portions of molten material which subsequently hardens. Alternatively the pads may stick to the road surface with adhesive, such as pressure sensitive adhesive on the underside of the pads. After the pads have been applied, a strip of molten white lining material may be applied over the pads so that a rumble strip continuous white line is formed.
Where the road surface along the line where the rumble strip has to be formed already has a white line, this may be softened by heat and the pads applied to the softened material before it re-hardens. Again, the pads may be rigid components or may be applied as molten portions. Another possibility is that the pads (rigid) can be stuck to the white line using adhesive.
Where there i8 no white line, but one is to be provided, this may be applied as described herein by applying the molten material to the road surface to form the strip, followed by the application of the pads (rigid) whilst the strip is still warm and soft.
Again it i8 possible to apply a further strip of white lining over the applied pads.
.. ..
WO92/17~8 21 o 7 7 7 ~ PCT/GB92/00610 In all cases where rigid pads are used, they are preferably pressed downwards onto the receiving surface after application.
Any feature of any rib pad laying apparatus described herein ~ can where appropriate be used in combination with any other s, feature of that apparatus or any other such apparatus ~, described herein.
:
t~
Claims (21)
1. Apparatus for the provision of a rumble strip or demarcation line incorporating a plurality of rib pads on a road surface, said apparatus comprising a movable rib pad laying unit and an integrated rib pad application means for the laying of the rib pads wherein said application means is linked to the speed of movement of the unit and the distance required between each rib pad when laid.
2. Apparatus for providing a rumble strip or demarcation line as in Claim 1 wherein said apparatus further includes a means for pressing said rib pads once laid.
3. Apparatus for providing a rumble strip or demarcation line as in Claims 1 or 2 wherein said apparatus further includes a burner unit to render a previously applied base strip or road surface into a molten state.
4. Apparatus for providing a rumble strip or demarcation line according to Claims 1, 2 or 3 wherein said apparatus includes a base strip application means for the application of a base strip to the road surface prior to the application of said rib pads into the said base strip to form the rumble strip or demarcation line.
5. Apparatus for providing a rumble strip or demarcation line according to Claim 4 wherein said apparatus includes means for spraying reflective beads on to said demarcation line or rumble strip.
6. Apparatus for providing a rumble strip or demarcation line according to Claim 1 wherein said rib pads are held in a magazine prior to application by the integrated rib pad application means.
7. Apparatus for providing a rumble strip or demarcation line as in Claim 6 wherein there is provided a plurality of said magazines.
8. Apparatus for providing a demarcation line or rumble strip according to Claim 1 wherein said apparatus includes a means for applying blobs of molten plastics material to the road surface, and the placing and pressing of rib pads thereon.
9. Apparatus for providing a demarcation line or rumble strip according to Claim 1 wherein said apparatus includes a means for applying an adhesive layer to the bottom surface of said rib pads.
10. Apparatus for providing a rumble strip or demarcation line according to Claim 1 wherein said rib pad application means comprises a feed wheel having peripheral pockets to receive the pads and deliver same, by rotation of the wheel, to the road surface.
11. Apparatus as in any of the preceding claims wherein the rib pad laying unit is engine driven and capable of being driven by an operator.
12. Apparatus as in any of the Claims 1 to 10 wherein said apparatus is manually powered.
13. Apparatus as hereinbefore described with reference to the accompanying drawings.
14. A method of producing a rumble strip comprising a continuous line incorporating a series of rib pads said strip formed by applying a plurality of rib pads to a road surface, said pads provided at spaced intervals to form a demarcation line and said line is oversprayed or painted to form a rumble strip.
15. A method of producing a rumble strip according to Claim 14 wherein said rib pads are adhered to the road surface by means of an adhesive layer on the bottom of said rib pads.
16. A method of producing a rumble strip according to Claim 14 wherein a blob of molten plastics material is applied to the road surface and the rib pad applied to said blob of material.
17. A method for applying rib pads to form a rumble strip as hereinbefore described with reference to the accompanying drawings.
18. Rib pads for use in forming a rumble strip or demarcation line, said pads formed of thermoplastics material and manufactured remote from the point of application of the pads and wherein said pads are manufactured from extruded lengths of thermoplastic material.
19. Lengths of extruded thermoplastics material as in Claim 18 wherein said lengths are controlled such that each length is the required length of a rib pad.
20. A length of extruded thermoplastics material as in Claim 18 wherein said length is cut into preset lengths to form rib pads.
21. Rib pads formed as in any of Claims 18 to 20 wherein said pads are provided with a soft bonding layer of material on the underside thereof.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919107186A GB9107186D0 (en) | 1991-04-05 | 1991-04-05 | Rib pad manufacturing plant |
| GB919107185A GB9107185D0 (en) | 1991-04-05 | 1991-04-05 | Road marking method |
| GB9107186.0 | 1991-04-05 | ||
| GB9107185.2 | 1991-04-05 | ||
| GB919118719A GB9118719D0 (en) | 1991-08-31 | 1991-08-31 | Improvements in the application of rib pads for road marking |
| GB9118719.5 | 1991-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2107774A1 true CA2107774A1 (en) | 1992-10-06 |
Family
ID=27265583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002107774A Abandoned CA2107774A1 (en) | 1991-04-05 | 1992-04-06 | Road marking method - the appliation of rib pads |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0592452B1 (en) |
| AT (1) | ATE181580T1 (en) |
| AU (1) | AU673136B2 (en) |
| CA (1) | CA2107774A1 (en) |
| DE (1) | DE69229475T2 (en) |
| ES (1) | ES2136619T3 (en) |
| WO (1) | WO1992017648A1 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1201548A (en) * | 1968-07-18 | 1970-08-05 | Prismo Safety Corp | Reflective markers and reflective elements therefor |
| DE1923877A1 (en) * | 1969-05-09 | 1970-11-19 | E Stieglan Fa | Mobile road marking machine |
| GB1531480A (en) * | 1974-12-20 | 1978-11-08 | Bagshaw R | Retroreflective elements |
| US4136991A (en) * | 1977-06-02 | 1979-01-30 | Elin R. Clark | Roadway marker and process of and application for producing the same |
| US4607978A (en) * | 1982-08-23 | 1986-08-26 | Ludwig Eigenmann | Method and equipment for improving horizontal marking strips |
| BR8401650A (en) * | 1983-04-11 | 1984-11-20 | Minnesota Mining & Mfg | ELASTOMERIC PAVING MARKER |
| EP0279205B1 (en) * | 1984-04-10 | 1991-09-18 | Minnesota Mining And Manufacturing Company | Elastomeric pavement marker |
| US4888896A (en) * | 1987-06-29 | 1989-12-26 | Sanchez Richard E | Utility cut patch identification tag |
| GB8910454D0 (en) * | 1989-05-06 | 1989-06-21 | Mone Bros Roadmarkings Limited | Road marking method |
| US4974990A (en) * | 1989-10-24 | 1990-12-04 | Minnesota Mining And Manufacturing Company | Raised pavement marker applicator |
-
1992
- 1992-04-06 ES ES92907462T patent/ES2136619T3/en not_active Expired - Lifetime
- 1992-04-06 AT AT92907462T patent/ATE181580T1/en active
- 1992-04-06 AU AU15317/92A patent/AU673136B2/en not_active Ceased
- 1992-04-06 DE DE69229475T patent/DE69229475T2/en not_active Expired - Fee Related
- 1992-04-06 CA CA002107774A patent/CA2107774A1/en not_active Abandoned
- 1992-04-06 WO PCT/GB1992/000610 patent/WO1992017648A1/en active IP Right Grant
- 1992-04-06 EP EP92907462A patent/EP0592452B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0592452A1 (en) | 1994-04-20 |
| DE69229475T2 (en) | 2000-05-04 |
| ATE181580T1 (en) | 1999-07-15 |
| AU1531792A (en) | 1992-11-02 |
| EP0592452B1 (en) | 1999-06-23 |
| AU673136B2 (en) | 1996-10-31 |
| WO1992017648A1 (en) | 1992-10-15 |
| DE69229475D1 (en) | 1999-07-29 |
| ES2136619T3 (en) | 1999-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |