Abrading – Machine – Sandblast
Reexamination Certificate
1998-03-17
2001-06-12
Morgan, Eileen P. (Department: 3723)
Abrading
Machine
Sandblast
C451S097000, C451S088000, C451S089000
Reexamination Certificate
active
06244940
ABSTRACT:
The invention relates to a blasting device for cleaning a wall according to the preamble of claim 1.
Such a device is known from EP-A-0,550,248. The blasting device described in this publication has the disadvantage that in the region of the blast opening there is insufficient air flow to prevent the dust occurring near the wall from leaking out along the seals between the blasting device and the wall. In the known device the air supply to the separation chamber is the main supply of air from outside the housing. The air supplied is largely used for air circulation in the separation chamber, and there is little air flow in the remainder of the housing and at the position of the seals. This means that the leakage of the dirt and dust removed from the wall is increased along the seals. Moreover, the blasting agent and dirt are separated only in the separation chamber, which is not ideal, and as a result the reused blasting agent will contains too much dirt. Consequently, additional dust can escape in the vicinity of the blast opening, which is undesirable.
The object of the device according to the invention is to make an improvement herein, and to this end the blasting device is provided with an air supply opening in the support plate through which during use the full air supply enters into the circulation chamber and continues into the closed housing through to a second opening, thereby creating high-speed air-circulation in the circulation chamber.
Placing the air supply between the inner and the outer seal ensures that a strong air stream occurs around the inner seal, which air stream entrains all dust leaking out between the inner seal and the wall. This means that no air and dust leak to the outside, and no pollution of the environment occurs.
A comparable device is known from U.S. Pat. No. 3,900,968, in which the material coming out of the blast opening is cleaned in a separation chamber situated below the blast opening, immediately after the material falls down from the blast opening. Owing to the fact that in this case the separation has to occur over a short distance, the separation is inadequate unless the extraction rate is greatly increased. However, this is not possible because in that case the blasting agent would be sucked up by the extraction device.
A device similar to U.S. Pat. No. 3,900,968 is described in DE-A-19 66 202. In this device the main air supply is through opening
42
, which is placed under the seals. The air supplied is mainly used for separation of blasting agent and dirt in the collection chamber which is situated below the blast opening. Here the separation between dust and blasting agent occurs over a short distance, whereby insufficient cleaning of the blasting agent occurs, which gives rise to additional dust during blast cleaning. Openings
32
supply air between the seals for cooling and transport of blasting agent and dirt. However, as the main air supply is through opening
42
only limited air circulation enters through the openings
32
. In DE-A-19 66 203 no indication is given that dust free blast cleaning is possible by guiding the full air supply in the circulation chamber and so creating a high-speed air-circulation and thereby preventing dust to escape outside the outer seal.
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patent: 3436866 (1969-04-01), Nye
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patent: 3864876 (1975-02-01), Diehn
patent: 4095378 (1978-06-01), Urakami
patent: 5090162 (1992-02-01), Nelson
patent: 5257479 (1993-11-01), Swain
patent: 5291697 (1994-03-01), Nelson
patent: 5441443 (1995-08-01), Roberts
patent: 5498197 (1996-03-01), Roberts et al.
patent: 5688162 (1997-11-01), Williams
patent: 1966202 (1972-04-01), None
patent: 9420172 (1995-03-01), None
patent: 1195464 (1970-06-01), None
patent: 403544 (1974-03-01), None
Boulton George F. Ch.
van Houten Adrianus G.
E.B.E. Nederland B.V.
Ladas & Parry
Morgan Eileen P.
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