Coating apparatus – Projection or spray type – Plural projectors
Patent
1993-09-14
1996-05-21
Warden, Jill
Coating apparatus
Projection or spray type
Plural projectors
118323, 404101, 404108, 404110, 404111, B05C 500
Patent
active
055185444
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an applicator for mounting on a vehicle for applying a surface treatment of tar and/or bituminous binder material reinforced with glass fibres.
GB-A-2 081 603 describes a surface dressing comprising a binder which is reinforced with chopped glass fibres with a suitable aggregate then being added to the thus coated substrate to be bound thereto by the same binder as has been reinforced with glass fibres.
GB-A-2 121 853 describes an applicator for attachment to a vehicle for applying a surface dressing of the type described in GB-A-2 081 603. The applicator comprises an open-bottomed housing containing at least one spray bar mounted to said housing for spraying binder material from a plurality of nozzles placed longitudinally on the spray bar housing to extend transversely of movement of the vehicle when mounted to said housing and means for depositing cut glass fibres from the glass fibre distributor through the open bottomed housing onto the surface of a layer binder material previously sprayed from the spray bar nozzles.
A problem associated with the applicator disclosed by GB-A-2 121 853 is providing an even layer of chopped glass fibres, and controlling the distribution of this layer over a first binder layer provided by a first spray bar. It has been found that the layer of chopped glass fibres is dispensed unevenly and indeed can be deposited on areas where there is no binder material. The unevenness gives a less than satisfactory surface treatment and the glass fibres which do not settle on the strip of binder applied are wasted, which is economically, as well as environmentally inefficient.
A further problem with the device of the prior art is the circulation of air caused by the spray of bitumen in the applicator. It is inevitable that within the housing, a certain amount of bitumen spray is circulated in an updraft and attaches to the source of the glass fibre spray, and/or the glass fibre feeders. Without frequent maintenance and cleaning of the glass fibre sources and feeders, the sources and feeders will clog up and operation of the applicator will be halted.
The present invention seeks to overcome the problems of the prior art described above. Thus the present invention provides an applicator for mounting on a vehicle for applying a surface treatment of tar and/or bituminous binder material reinforced with glass fibres, such an applicator comprising an open bottomed spray bar housing, at least one spray bar mounted on said housing and adapted to extend transversely of the direction of movement of the vehicle on which the applicator is mounted, a plurality of nozzles spaced longitudinally along the spray bar for spraying binder material, means for controlling said nozzles, means for dispensing cut glass fibres through said open bottomed housing to the surface of binder material previously sprayed from the spray bar nozzles during use of the applicator, characterized in that the means for dispensing the cut glass fibres comprise a plurality of sources mounted in said housing and mounted at locations spaced along a plane substantially parallel to said spray bar, such that the glass fibres are dispensed substantially evenly onto the surface of binder material previously sprayed from the spray bar nozzles.
The plane along which the plurality of glass fibre sources are located is preferably a single straight line. Such an arrangement allows the plurality of sources to be powered easily by a single power supply but to operate individually.
The plurality of sources for the glass fibre are preferably similar in number, for example .+-.1 or 2 of the number of spray bar nozzles. Most preferably, the number of glass fibre sources are identical to the number of spray bar nozzles. Such an arrangement allows the plurality of nozzles and glass fibre sources to be arranged such that each glass fibre source is in substantially the same plane of the applicator in the direction of motion of the vehicle as an associated nozzle. Preferably, each pair of a nozzle and an associated glass fib
REFERENCES:
patent: 1165331 (1915-12-01), Gray
patent: 4066723 (1978-01-01), King et al.
patent: 4770117 (1988-09-01), Hetherington
Ludlow Jan M.
Warden Jill
LandOfFree
Applicator for applying a surface treatment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Applicator for applying a surface treatment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Applicator for applying a surface treatment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2034918