Classifying – separating – and assorting solids – Sifting – Elements
Reexamination Certificate
2000-07-05
2002-08-13
Walsh, Donald P. (Department: 3653)
Classifying, separating, and assorting solids
Sifting
Elements
C209S401000, C210S490000, C210S497010
Reexamination Certificate
active
06431368
ABSTRACT:
BACKGROUND OF THE INVENTION
Vibratory screen systems have long been employed in both circular and rectangular form. The devices typically include a resiliently mounted housing having a screen extended across the housing. A vibration generating drive is coupled with the housing to vibrate the screen in an advantageous manner to increase screening efficiency. The screens are either self contained by including screen cloth tensioned and bonded to a frame or rely on mechanisms on the resiliently mounted housing for placement and tensioning. In the latter circumstance, the screen typically includes screen cloth to which may be mounted hooks or eyes for attachment of tensioning mechanisms associated with the housing.
Alternatively, screens can include a perforated plate with screen cloth bonded thereto. When a plate is used, the screen may be tensioned before bonding to the plate. The screen cloth may be bonded to the plate by a layer of epoxy or thermoplastic material. The bonding material is positioned on the plate and the screen tensioned thereover. The material is then treated, commonly by heating to either initiate curing of the epoxy or fusing of the thermoplastic material. Nonstick layers of PTFE sheet may be employed where the assembly is compressed during the curing or fusing step. Multiple layers of screen cloth are known to be used in such assemblies. The plates include interstices for the passage of the screened material therethrough.
Screens which employ hooks or eyes for tensioning by a separate mechanism having laminated layers have also been known. Bonding to frames by spot welding, epoxy or fusible material are known. Further, fusing multiple layers of screen cloth into the top of a frame structure made of fusible material having a peripheral frame and a pattern of open cells defined by cell walls has been previously known. The multiple screen cloths are bonded to the frame and the cell walls by fusing the frame structure and resolidifying it after impregnation through the screen cloth or cloths. Such a structure is disclosed in U.S. Pat. No. 5,851,393, the disclosure of which is incorporated herein by reference. Backup layers have been coated with epoxy and bonded to filter cloth such as disclosed in U.S. Pat. No. 5,814,218. Diffusion bonding is practiced between metal screens. The layers of screen cloth are pressed together and subjected to substantial heat for an extended time. No bonding material is used in the diffusion bonding process.
SUMMARY OF THE INVENTION
The present invention is directed to a laminated screen having two or more woven screen cloths. One of these woven screen cloths includes threads having surfaces which are fusible below a temperature at which the other woven screen cloth is heat affected. Heat effects to be avoided are changes in the physical and chemical properties of the screen cloth. These threads with surfaces fusible below a temperature at which the other woven screen cloth is heat affected are woven into the cloth. The screen cloths are of different mesh size with the courser mesh including the threads with fusible surface material. The fusible surface material is fused into the other screen cloth at the knuckle contacts of these threads with the finer screen cloth.
A number of embodiments are described which practice the foregoing inventive concept. Threads with fusible surfaces may be dispersed within the screen cloth to best advantage. Such threads may be arranged in only one direction of the screen cloth. Such. threads may be spaced apart with conventional threads therebetween. The threads with fusible surfaces may additionally be fusible fully therethrough. The screen cloth threads may be metal wire such as stainless steel.
Accordingly, it is an object of the present invention to provide an improved laminated screen. Other and further objects and advantages will appear hereinafter.
REFERENCES:
patent: 659416 (1900-10-01), Perry
patent: 1459845 (1923-06-01), Mitchell
patent: 1718385 (1929-06-01), Sherwood
patent: 1947307 (1934-02-01), Rafton
patent: 2061850 (1936-11-01), Roberts
patent: 2082513 (1937-06-01), Roberts
patent: 2455383 (1948-12-01), Pickard
patent: 2604989 (1952-07-01), Warhol
patent: 2723032 (1955-11-01), Gisler et al.
patent: 3214314 (1965-10-01), Rowbottam
patent: 3261469 (1966-07-01), Wehner
patent: 3905788 (1975-09-01), Alliger
patent: 4028230 (1977-06-01), Rosenblum
patent: 4120785 (1978-10-01), Kanamori et al.
patent: 4247007 (1981-01-01), Kai
patent: 4526682 (1985-07-01), Wallace
patent: 4575421 (1986-03-01), Derrick et al.
patent: 4696751 (1987-09-01), Eifling
patent: 4728422 (1988-03-01), Bailey
patent: 4762610 (1988-08-01), Freissle
patent: 4861462 (1989-08-01), Lehmann et al.
patent: 5039412 (1991-08-01), Marsh
patent: 5047148 (1991-09-01), Arai
patent: 5076924 (1991-12-01), Persson et al.
patent: 5221008 (1993-06-01), Derrick, Jr. et al.
patent: 5330057 (1994-07-01), Schiller et al.
patent: 5385669 (1995-01-01), Leone, Sr.
patent: 5417793 (1995-05-01), Bakula
patent: 5417858 (1995-05-01), Derrick et al.
patent: 5417859 (1995-05-01), Bakula
patent: 5587077 (1996-12-01), Aaltonen et al.
patent: 5598930 (1997-02-01), Leone et al.
patent: 5673797 (1997-10-01), Bakula et al.
patent: 5720881 (1998-02-01), Derrick
patent: 5783077 (1998-07-01), Bakula
patent: 5814218 (1998-09-01), Cagle
patent: 5851393 (1998-12-01), Carr et al.
patent: 5868929 (1999-02-01), Derrick et al.
patent: 5876552 (1999-03-01), Bakula
patent: 5888336 (1999-03-01), Bakula et al.
patent: 5944993 (1999-08-01), Derrick et al.
patent: 5958236 (1999-09-01), Bakula
patent: 5971159 (1999-10-01), Leone et al.
patent: 6000556 (1999-12-01), Bakula
patent: 6032806 (2000-03-01), Leone et al.
patent: 6053332 (2000-04-01), Bakula
patent: 6152307 (2000-11-01), Adams et al.
patent: 31 14573 (1987-04-01), None
patent: WO 94/15723 (1994-07-01), None
patent: WO 94/23849 (1994-10-01), None
patent: WO 99 24144 (1999-05-01), None
U.S. Patent Application S.N. 09/401,425, filed Sep. 22, 1999, Brian S. Carr, Vibratory Screening System and Screen Therefor (Specification, Claims, Drawings).
Emerson Electric Co.
Lyon & Lyon LLP
Rodriguez Joseph C
Walsh Donald P.
LandOfFree
Vibratory screen does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vibratory screen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibratory screen will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2953012