Fluent material handling – with receiver or receiver coacting mea – With guard or screen for operator
Reexamination Certificate
2000-07-24
2001-08-14
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
With guard or screen for operator
C239S120000, C451S087000, C451S089000
Reexamination Certificate
active
06273154
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention:
The invention lies in the mechanical and fluid mechanical fields. More specifically, the invention relates to an apparatus for the suction removal of dust and/or liquids produced during pressure blasting operations with sandblasting or liquid pressure nozzles.
During blasting work, large quantities of blasting material (granules, glass, beads, slag and sand) together with residues of blasted color coating are projected over a large area after impact with the surface being blasted. This results in the pollution of large areas of the surrounding environment. The large quantities of dust produced cause problems for the population over a much wider area.
SUMMARY OF THE INVENTION
The object of the invention is to provide a suction-removal apparatus for the real-time removal of pressure blasting residues which overcomes the above-noted deficiencies and disadvantages of the prior art devices and methods of this kind, and which easily adapts to various kinds of work area surfaces, including uneven surfaces, and which, despite its suction attachment to the work area, can be relatively easily moved along the work area surface (in two degrees of freedom) without becoming detached from the surface.
With the above and other objects in view there is provided, in accordance with the invention, a suction-removal apparatus for sand-blasting and liquid pressure nozzles, comprising:
a double-wall protective shroud enclosing a blasting chamber to be placed on a surface of a work area, the protective shroud having two walls defining a cavity there-between and a surrounding suction channel communicating with a first suction-removal system for removing by suction from a contact surface between the protective shroud and the surface of the work area blasting products generated at the work area;
a second, independent suction-removal system including a plurality of suction pipe connection stubs protruding through the double-wall protective shroud into the blasting chamber and distributed about an entire periphery of the protective shroud;
an inner blasting-pressure nozzle enclosed in a surrounding suction pipe and being adjustably and movably mounted in the protective shroud;
deflection devices selected from the group consisting of baffles, deflection plates, and profiles mounted inside the protective shroud for deflecting blasting material or liquids directly to the suction pipe connection stubs; and
rolling devices mounted on the protective shroud for placement in contact with the surface of the work area for allowing a displacement of the protective shroud relative to the surface in spite of a suction attachment of the protective shroud during an operation of the suction-removal apparatus.
With the novel invention, dust particles and blasting particles propelled away during blasting work, as well as liquids and remains of blasted-off coating, are removed by suction directly from the area of effectiveness and proximity of the blasting-pressure nozzles or chipping or drilling devices from all sides simultaneously in a way corresponding to the blasting pressure. The dust or other removal products are directed into receptacles.
In accordance with an added feature of the invention, one or more suction pipe connection stubs are mounted on an outer surface of the protective shroud and communicating with and generating a negative pressure in the cavity. Preferably, the suction pipe connection stubs are formed with suction openings that are funnel-shaped, semicircular, triangular, oval, rectangular, square, or round.
In accordance with another feature of the invention, suction manifold lines interconnect the suction pipe connection stubs and connect to a respective the suction-removal system. The suction pipe connection stubs are rigidly, jointed, or movably connected to the suction manifold lines.
In accordance with an additional feature of the invention, at least one collection receptacle is connected to the suction-removal system and a limit switch associated with the collection receptacle for switching off a blasting pressure when the receptacle is fully loaded, without immediately interrupting a suction removal via the suction manifold lines.
In accordance with a further feature of the invention, sealing strips are attached in a vicinity of the suction channel, only inside, only outside, or on both sides of the suction channel.
In accordance with again an added feature of the invention, the protective shroud is formed of individual segments enclosing the surface and height-adjustably mounted, and displaceably fixed with respect to one another to adapt automatically to uneven surface contours of the work area. In a preferred embodiment, the protective shroud is foldable and bendable to angles of various degrees, for reliably covering grooves in the work area.
In accordance with again an additional feature of the invention, the enclosing suction pipe with the blasting-pressure nozzle fastened inside thereof is inserted into the blasting chamber inside the protective shroud and mounted therein to be adjustable in height, and displacable to be fixed in a variety of positions relative to the protective shroud. The enclosing suction pipe is preferably mounted so as to protrude through a passage in the double-wall of the protective shroud.
In accordance with again another feature of the invention, the blasting-pressure nozzle has an outer periphery provided with at least one individual suction-removal pipe.
In accordance with again a further feature of the invention, a suction power and intensity at the suction channel and in the blasting chamber is automatically adjusted in dependence on a blasting pressure.
In accordance with yet an added feature of the invention, the rolling devices are height-adjustably, swingably, and lockably mounted. In a preferred embodiment, the rolling devices are driven rollers which are either mechanically driven, by compressed air, or with hydraulic fluid.
In accordance with yet an additional feature of the invention, the deflection devices at the suction channel are held in position by spring force and are articulated on an inner wall of the protective shroud. Preferably, the deflection devices are arranged inside the protective shroud in various positions and directions in a spiral or helical order, or alternatively in straight alignment.
In accordance with yet another feature of the invention, the deflection devices protrude substantially perpendicular from an inner wall surface of the protective shroud.
With the above and other objects in view there is also provided, in accordance with the invention, a suction-removal apparatus for sand-blasting and liquid pressure nozzles, comprising:
a protective shroud enclosing a blasting chamber to be placed on a surface of a work area;
a suction-removal system communicating with the blasting chamber inside the protective shroud, the suction-removal system including a plurality of suction pipe connection stubs protruding into the blasting chamber and distributed about the protective shroud;
an inner blasting-pressure nozzle projecting into the blasting chamber in the protective shroud and being adjustably and movably mounted at the protective shroud;
deflection devices selected from the group consisting of baffles, deflection plates, and profiles mounted inside the protective shroud for deflecting blasting material or liquids directly to the suction pipe connection stubs; and
rolling devices mounted on the protective shroud for placement in contact with the surface of the work area for allowing a displacement of the protective shroud relative to the surface in spite of a suction attachment of the protective shroud during an operation of the suction-removal apparatus.
In this single-walled shroud, therefore, the removal suction is essentially driven by a single vacuum system.
In accordance with an added feature of the invention, the suction pipe connection stubs communicate with nozzles of variously formed shapes distributed over a periphery of the protective shroud.
In accordance with an
Douglas Steven O.
Greenberg Laurence A.
Lerner Herbert L.
Stemer Werner H.
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