Fluid sprinkling – spraying – and diffusing – With mobile tank-type supply means – Vehicle drawn or carried
Reexamination Certificate
2000-04-03
2001-05-22
Douglas, Lisa Ann (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With mobile tank-type supply means
Vehicle drawn or carried
C239S304000
Reexamination Certificate
active
06234408
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a mobile apparatus for spraying fireproofing and specialty coatings onto buildings during construction. In particular, the invention relates to a mobile unit having all of the required parts for completing a spraying job, all mounted onto a trailer that also functions as a work platform during spraying.
2. The Prior Art
In the field of fireproofing, the product to be applied is shipped in solid granular form and then mixed with water and sprayed onto the beams of new construction. The product is often mixed with an accelerator immediately prior to the spraying, to aid in the hardening of the product after spraying.
Typically, the fireproofing company brings the spraying equipment to the job site, where the product is first mixed with water in a mixer, and then transferred to a separate pump for spraying. All of the components are brought separately to the job site and used there. This has the disadvantage of requiring the product, power supply, mixers and pump to be separately brought to and from the job site. It also requires a separate outside power supply for the motorized components. It would be desirable to create a mobile unit that includes all of the necessary components for completing a spraying job, so that the unit merely needs to be driven from site to site.
Mobile sprayers are known. For example, U.S. Pat. No. 3,858,761 to O'Dell discloses a mobile pressure spraying apparatus having fluid reservoir, a pump and a nozzle mounted onto a trailer for spraying fluid such as asphalt sealers. U.S. Pat. No. 1,602,105 to Geer et al. discloses another portable spraying device having two tanks for holding the material to be sprayed and an air compressor for spraying. U.S. Pat. No. 3,831,849 to Studinger discloses another mobile sprayer having a gasoline engine driving a high pressure pump and having tanks for holding the fluids to be sprayed.
Various other insulation spraying devices are shown in U.S. Pat. No. 4,542,040 to Nowak, U.S. Pat. No. 5,788,163 to Woten et al., U.S. Pat. No. 4,376,512 to Kistner, U.S. Pat. No. 3,476,318 to Eckert, U.S. Pat. No. 5,853,802 to Boyer et al. and U.S. Pat. No. 5,320,870 to Sorathia et al.
While all of these inventions provide for spraying insulation or other liquids, none of the references disclose a completely self-contained work platform having all of the materials and machinery necessary to complete an insulation spraying job.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a mobile cementious fireproofing and specialty coating apparatus that is portable.
It is another object of the invention to provide a mobile cementious fireproofing and specialty coating apparatus that contains all of the elements necessary to complete a spraying job in a single apparatus.
It is another object of the invention to provide a mobile cementious fireproofing and specialty coating apparatus that also serves as a work platform during spraying.
It is a further object of the invention to provide a mobile cementious fireproofing and specialty coating apparatus having a pump that can be remotely controlled from the nozzle.
It is yet a further object of the invention to provide an mobile cementious fireproofing and specialty coating apparatus that allows for the product to mix with an accelerator at the nozzle.
These and other objects of the invention are accomplished by a mobile cementious fireproofing and specialty coating apparatus comprising a trailer having wheels and adapted to be attached to a truck, a generator mounted on the trailer, and a fuel tank connected to the generator and mounted on the trailer, for powering the mixing and pumping apparatus. There is a work platform mounted to the trailer to allow the operators to work directly on the unit. A mixer for mixing dry product with water is mounted on the work platform. The mixer comprises a vat, a rotatable mixing tool within the vat, and a motor connected to the mixing tool for rotating the mixing tool. The motor is connected to and powered by the generator.
A pump is connected to the generator and is mounted on the trailer adjacent the mixer. A hose is connected to the pump and to a spray nozzle for spraying product from the pump onto the construction site.
There is a second mixer for mixing accelerator with water mounted on the work platform. The second mixer comprises a mixing tank, a rotatable mixing tool disposed within the mixing tank and a motor connected to the mixing tool and the generator. There is a second pump connected to the generator for pumping the accelerator, and a second hose connected at one end to the second pump and at another end to the nozzle to mix the accelerator with the product immediately prior to spraying.
There are controls connected to the pump for turning the pump off and on. A tool box is mounted to the work platform for housing tools and equipment for on-site repairs. There is also a compartment for holding scaffolding, and there is scaffolding mounted to the trailer, so that the mobile unit is completely self contained and allows the operators to complete a spraying job without any outside support, except for a water source. Alternatively, the apparatus could also work in conjunction with a tanker truck.
In a preferred embodiment, there is a remote switch located on the nozzle for turning the pump off and on from the nozzle. This way, the pump can be turned off immediately and prevent any machine or pump line problems.
The second mixer, which mixes the accelerator, has a bracket mounted around the top edge of the mixing tank and connected to the mixing tool. The bracket has three prongs extending out from a central core, each prong being attached to the top edge of the mixing tank via a clamp. The clamp has an inside plate and an outside plate connected by a screw. The top edge of the mixing tank is inserted between the two plates and the screw is tightened to firmly mount the clamp to the mixing tank.
The mixing vat, which holds the mixed product, is pivotally mounted to the work platform and has a top opening, so that the product is transported from the mixing vat to the pump by tipping the mixing vat until the product pours from the mixing vat into the pump.
There is preferably at least one storage unit mounted to the trailer for storing scaffolding parts.
The fuel tank holds 180 gallons of diesel fuel for powering the generator. The generator is preferably a John Deere 40 Kw generator. The pump preferably has at least 30 horsepower and the mixer motor preferably has 9 horsepower. The scaffolding and work platform are preferably made of custom fabricated galvanized carbon steel.
The hose is preferably between 20 and 2000 feet long and has a diameter of about 2 inches near the pump. The diameter progressively decreases toward the nozzle, so that the diameter near the nozzle is about 1 inch. The apparatus also has a compartment that stores 200-300 feet of 3 in. vertical aluminum pump line.
Typical products used with the mobile unit are MK6® manufactured by Grace Products, Spatterkote-3® and Cafco 300® manufactured by U.S. Mineral Products. All products manufactured by WR Grace, Isolotech, Pyrock, Carboline, U.S. Mineral and others could also be used. As an example, the product is mixed at a ratio of 24 gallons of water to 340 lb bags of product in the mixer. The product is mixed for approximately 90 seconds prior to pumping, and hardens within 5 minutes when mixed with accelerator. A suitable accelerator is Monokote® by Grace products, which is an aluminum sulfate hydrate. The accelerator is mixed with water at a ratio of 1 60 lb bag of accelerator to 10 gallons water. The accelerator is pumped into the nozzle so that it mixes with the product immediately prior to spraying. The sprayed product preferably has about 3% accelerator in it. Some products do not require accelerator.
REFERENCES:
patent: 160033 (1875-02-01), Roush
patent: 401306 (1889-04-01), Schock et al.
patent: 656123 (1900-08-01), Kempf
patent: 925652 (1909-06-01), Rippy
patent: 16021
Stevens Matthew
Stevens Roger E.
Stevens Timothy
Collard & Roe PC
Douglas Lisa Ann
LandOfFree
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