Patent US4047843A successfully refreshed from Google Patents.
US4047843A
Expired / Lapsed
US
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Centrifugal impeller for sandblasting installations
Assignee: Alfred Gutmann Gesellschaft fuer Maschinenbau
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Filing: 1976-06-11
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Granted: 1977-09-13
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Expires: 1996-06-11
Abstract
Abstract A centrifugal impeller of the so-called single-disc wheel type wherein the projector blades are mounted by dovetail joints to the impeller wheel and locked in position by releasable entirely encapsulated leaf springs inserted into recesses between the impeller wheel and an associated projector blade.
Inventors
- 👤 Johannes Zeidler
- 👤 Bernd Von Borcke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
B; B24; B24C; B24C5/00; B24C5/06; B24C5/062
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A centrifugal impeller for sandblasting installations, comprising a rotatively driven centrifugal impeller wheel having a radially outwardly directed side surface, a plurality of radially oriented projecting blades mounted on said side surface of the impeller wheel by associated dovetail joints, and spring members operatively positioned between said side surface and said blades locking said blades in their mounted positions, said centrifugal impeller wheel and each projecting blade defining between them a recess in the region of each dovetail joint for accommodating a spring member in its operative position, each spring member being enclosed entirely in its recess between its associated projecting blade and the impeller wheel.
Claim 2
Dependent Claim
106 words
A centrifugal impeller for sandblasting installations, comprising a rotatively driven centrifugal impeller wheel having a radially outwardly directed side surface, a plurality of radially oriented projecting blades mounted on said side surface of the impeller wheel by associated dovetail joints, and spring members operatively positioned between said side surface and said blades locking said blades in their mounted positions, said centrifugal impeller wheel and each projecting blade defining between them a recess in the region of each dovetail joint for accommodating a spring member in its operative position, each spring member being enclosed entirely in its recess between its associated projecting blade and the impeller wheel.
Claim 3
Dependent Claim
181 words
A centrifugal impeller for sandblasting installations, comprising a rotatively driven centrifugal impeller wheel, a plurality of radially oriented projecting blades mounted on one side surface of the impeller wheel by associated dovetail joints, and spring members locking said blades in their mounted positions, said centrifugal impeller wheel and each projecting blade defining between them a recess in the region of each dovetail joint for accommodating a spring member in its operative position so that each spring member is enclosed entirely between its associated projecting blade and the impeller wheel, each dovetail joint including a dovetail key on the projecting blade and a dovetailed groove in the centrifugal impeller wheel, and each associated recess extending lengthwise in the inner face of its dovetail key opposite the bottom wall of its dovetail groove and into the centrifugal impeller wheel to provide a recess edge facing radially inward so that upon sliding the spring member in a radial inward direction into the dovetailed groove the radially outer end surface of the spring member engages said edge of the recess in the centrifugal impeller wheel.
Claim 4
Dependent Claim
181 words
A centrifugal impeller for sandblasting installations, comprising a rotatively driven centrifugal impeller wheel, a plurality of radially oriented projecting blades mounted on one side surface of the impeller wheel by associated dovetail joints, and spring members locking said blades in their mounted positions, said centrifugal impeller wheel and each projecting blade defining between them a recess in the region of each dovetail joint for accommodating a spring member in its operative position so that each spring member is enclosed entirely between its associated projecting blade and the impeller wheel, each dovetail joint including a dovetail key on the projecting blade and a dovetailed groove in the centrifugal impeller wheel, and each associated recess extending lengthwise in the inner face of its dovetail key opposite the bottom wall of its dovetail groove and into the centrifugal impeller wheel to provide a recess edge facing radially inward so that upon sliding the spring member in a radial inward direction into the dovetailed groove the radially outer end surface of the spring member engages said edge of the recess in the centrifugal impeller wheel.
Claim 5
Dependent Claim
58 words
A centrifugal impeller according to claim 2, wherein said centrifugal impeller wheel includes for each projecting blade an aperture accessible from the side surface of the impeller wheel opposite a projecting blade, the aperture communicating with the region in which the associated spring member locks the projecting blade and engages an edge portion of the centrifugal impeller wheel.
Claim 6
Dependent Claim
24 words
A centrifugal impeller according to claim 3, wherein said aperture communicates with said recess at said edge which is engagable by said spring member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |