Abrading – Machine – Sandblast
Patent
1996-01-24
1997-11-18
Rose, Robert A.
Abrading
Machine
Sandblast
451 94, 451 95, 451 97, 451 98, 451 38, 451 39, B24C 506
Patent
active
056881622
DESCRIPTION:
BRIEF SUMMARY
This invention relates to blast wheels and cages for blast wheels,
SUMMARY OF THE INVENTION
According to this invention a cage for a blast wheel comprises an angularly and axially extending wall, and aperture means in the wall, the aperture means having a non-uniform shape as it extends angularly.
The aperture means may be of less cross-section (axial extent) in a region intermediate the angular end regions of the aperture.
The aperture means may have a closed periphery.
The aperture means may comprise two angularly spaced apertures. The apertures may be circular. The aperture means may comprise two spaced arrays of apertures. The arrays may be triangular.
The aperture means may have angularly spaced sides and a base side and the base side may be non-straight as viewed laterally. The base side may be convex.
The aperture means may be diabolo-section.
The aperture means may be symmetrical about an axial plane of the cage.
The aperture means may be non-symmetrical about an axial plane of the cage.
The aperture means may be non-symmetrical about an axial plane; for example of larger cross-section at one angular end than the other end.
A blast wheel may comprise a rotor assembly and a cage as above.
The rotor assembly may comprise a bladed element and an impeller.
The invention may be performed in various ways and some specific embodiments with possible modifications will now be described by way of example with reference to the accompanying drawings, in which:
DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a blast wheel;
FIG. 2 is an axial view of part of the wheel;
FIGS. 3 to 17 are side views of various cages; and FIGS. 18, 18a, and 19 are diagrammatic views of blast apparatus.
DETAILED DESCRIPTION OF THE INVENTION
A blast wheel 10 comprises a bladed rotor 11 and a cage 12. In use the rotor 11 is rotated relative to the cage 12.
The rotor 11 comprises a circular disc 13 one face 14 of which has a number of equiangularly spaced flat radial blades 15 extending between the outer rim 16 and a central aperture 17.
The rotor 11 includes an impeller 18. As shown, the impeller 18 has an end wall 19 secured to the disc 13 and the wall 19 has a central aperture 20a. A rotor shaft 20b, FIG. 2, locates in aperture 17 and the rotor and impeller are secured to the shaft by suitable means which close aperture 20a.
A circular wall 21 extends from one face of the wall 19 and includes a number of elongate apertures 22 disposed (FIG. 2) slightly in advance of the respective blade 15 with regard to the direction of rotation A.
The cage 12 is fixed for example to wall 12a shown and includes a circular wall 23 which surrounds the wall 21. The wall 23 includes an aperture or opening 24. The cage is shown chain-dotted in FIG. 2.
In use, particulate material e.g. shot or grit is introduced through aperture 20 at the end of the cage 12 and passes through apertures 22, 24 and is flung out by the blades 15 somewhat as shown in FIG. 2 to hit a surface 30 to be treated.
In the present case the aperture 24 is shaped to enable the abrasive effect of the shot on the surface 30 to be more nearly even than if the aperture 24 were say a simple rectangle.
Thus, in FIG. 1, the aperture has angularly spaced parallel or, as shown, slightly converging, end faces 31, 32 and a central projection 33 extends from base edge 34 towards the disc 13 but stops short of a radial plane containing the end 35 of the wall 23.
The side faces 36, 36a of the projection 33 converge as they extend towards the disc 13.
Thus the aperture 24 is in effect two apertures 37, 38 connected by a portion 39 and is open on the side nearer disc 13.
In FIG. 3 the aperture 40 is similar but in this case the end is closed by wall 41.
FIG. 17 is similar but the projection 33 extends to and is integral with wall 41.
In FIG. 4 the projection 33 is a part-circle 42; and the opening has axial circumferentially spaced end walls. FIG. 5 is generally similar to FIG. 4 but includes wall 41.
In FIG. 6 the aperture 43 is in the form of a diabolo section.
In FIG
REFERENCES:
patent: 2077637 (1937-04-01), Minich
patent: 2708814 (1955-05-01), Straub
patent: 3653239 (1972-04-01), Carpenter, Jr.
patent: 4333278 (1982-06-01), Schutle et al.
patent: 4395851 (1983-08-01), Watts
patent: 4565035 (1986-01-01), Carpenter, Jr. et al.
patent: 4649673 (1987-03-01), Van Huyssteen
patent: 4751798 (1988-06-01), McDade
Hinds William R.
Nguyen George
Rose Robert A.
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