Patent US3921337A successfully refreshed from Google Patents.
US3921337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal blasting apparatus
Assignee: Individual
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Filing: 1974-12-30
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Granted: 1975-11-25
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Expires: 1994-12-30
Abstract
Abstract A centrifugal blasting apparatus including an improved blast wheel and an improved deflector is disclosed. The blast wheel comprises a pair of saucer-like disks and a plurality of vanes extending between the disks, attached thereto and spaced equiangularly from each other. Each of the vanes is comprised of a central face of substantially isosceles triangle configuration and a pair of substantially triangular sloping faces. The sloping faces extend from the equal sides of the central face farther off the axis of rotation of the blast wheel than the central face and slant laterally and backwards with respect to the direction of rotation of the blast wheel. The deflector has a feed slot formed through the peripheral wall thereof. The feed slot is of a nocklike configuration oriented to point to the direction of rotation of the blast wheel. Such a blasting apparatus can present a regular and widened blast pattern having a uniform distribution of abrasive particles, thereby giving a desirable even processing to the workpiece.
Inventors
- 👤 Riichi Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:29
CPC Classifications
B; B24; B24C; B24C5/00; B24C5/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
346 words
A centrifugal blasting apparatus including a chute, a stationary hollow cylindrical deflector connected at one opening end thereof to said chute for receiving therewithin abrasive particles fed via said chute and provided with a feed slot formed through the peripheral wall thereof, a rotatable impeller positioned within said deflector with the axis of rotation thereof coinciding with the axis of the deflector for hurling the abrasive particles through said feed slot, a drive shaft carrying said impeller, and a rotatable blast wheel fixed to said drive shaft so as to be positioned cocentrically with said deflector and rotated together with said impeller, said blast wheel comprising: a. a pair of disks, one of said disks being fixed to said drive shaft; and b. a plurality of vanes extending between said disks, attached thereto and spaced equiangularly from each other, said vanes each comprising a central face of a substantially isosceles triangle configruation and a pair of substantially triangular sloping faces extending from the respective equal sides of said central face, at least a part of each of said sloping faces slanting laterally and backwards with respect to the direction of rotation of said blast wheel, the distance between a pair of apexes of said sloping faces which are opposite to the equal sides of said central face being longer than the length of the bottom edge of said central face, the distance from one of said pair of apexes of said sloping faces to the bottom edge of said central face being longer than the height of said central face between the top apex thereof and the bottom edge, and said vanes being attached to said pair of disks at the sides of the sloping faces opposite to the top apex of said central face in such a way that the bottom edge of said central face is parallel with the axis of rotation of said blast wheel and also that the top apex of said central face is positioned opposite to the axis of rotation with respect to the bottom edge of said central face.
Claim 2
Dependent Claim
346 words
A centrifugal blasting apparatus including a chute, a stationary hollow cylindrical deflector connected at one opening end thereof to said chute for receiving therewithin abrasive particles fed via said chute and provided with a feed slot formed through the peripheral wall thereof, a rotatable impeller positioned within said deflector with the axis of rotation thereof coinciding with the axis of the deflector for hurling the abrasive particles through said feed slot, a drive shaft carrying said impeller, and a rotatable blast wheel fixed to said drive shaft so as to be positioned cocentrically with said deflector and rotated together with said impeller, said blast wheel comprising: a. a pair of disks, one of said disks being fixed to said drive shaft; and b. a plurality of vanes extending between said disks, attached thereto and spaced equiangularly from each other, said vanes each comprising a central face of a substantially isosceles triangle configruation and a pair of substantially triangular sloping faces extending from the respective equal sides of said central face, at least a part of each of said sloping faces slanting laterally and backwards with respect to the direction of rotation of said blast wheel, the distance between a pair of apexes of said sloping faces which are opposite to the equal sides of said central face being longer than the length of the bottom edge of said central face, the distance from one of said pair of apexes of said sloping faces to the bottom edge of said central face being longer than the height of said central face between the top apex thereof and the bottom edge, and said vanes being attached to said pair of disks at the sides of the sloping faces opposite to the top apex of said central face in such a way that the bottom edge of said central face is parallel with the axis of rotation of said blast wheel and also that the top apex of said central face is positioned opposite to the axis of rotation with respect to the bottom edge of said central face.
Claim 3
Dependent Claim
32 words
A centrifugal blasting apparatus according to claim 1 in which said feed slot is of a nock-like configuration so oriented as to point to the direction of rotation of said blast wheel.
Claim 4
Dependent Claim
34 words
A centrifugal blasting apparatus according to claim 2 in which said vanes each are so constructed that said central face and said sloping faces form an obtuse included angle at the boundary lines thereof.
Claim 5
Dependent Claim
59 words
A centrifugal blasting apparatus according to claim 2 in which said vanes each are so constructed that said sloping faces are provided with convexly curved surfaces along the boundary lines between said central and sloping faces, the breadth of the convexly curved surfaces becoming gradually greater as it goes farther off the axis of rotation of said blast wheel.
Claim 6
Dependent Claim
32 words
A centrifugal blasting apparatus according to claim 2 in which said vanes each are so constructed that the free edges of said sloping faces are arcuately projected outwardly of said blast wheel.
Claim 7
Dependent Claim
52 words
A centrifugal blasting apparatus according to claim 2 in which said vanes each are so constructed that the boundary lines between said central and sloping faces are curvilinearly projected inwardly of said central face, thereby reducing very much the breadth of said central face in the vicinity of the top apex thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |