Patent US3808716A successfully refreshed from Google Patents.
US3808716A
Expired / Lapsed
US
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Dredge cutter head
Assignee: Hattum En Blankevoort Bv Van
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Filing: 1972-02-11
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Granted: 1974-05-07
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Expires: 1992-02-11
Abstract
Abstract A cutter head construction for use in a cutter dredger, comprising a plurality of spiral-helical arms which on one end join together at a hub and on the other are connected by means of a supporting ring, to which arms are secured lateral ground working teeth each consisting towards their operative ends of a tooth crown extending from a tooth crown base, the representative tooth tips of which crowns, defined as the points halfway the tip or the middle of a cutting rib formed at the free end of the unworn tooth crown and the projection on the axis of the tooth crown of the centre of the wearing surface of the worn tooth crown, together define an imaginary enveloping plane in the form of a plane of revolution co-axial with said hub and said ring.
Inventors
- 👤 A Verbeek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:17
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9293; E02F3/9212; E02F3/9225; E02F9/00; E02F9/28; E02F9/2866
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A cutter head construction for use in a cutter dredger, comprising a plurality of spiral-helical arms which on one end join together at a hub and on the other are connected by means of a supporting ring, to which arms are secured lateral ground working teeth each consisting towards their operative ends of a tooth crown extending from a tooth crown base, the tips or the middles of the cutting edge of the tooth crowns together defining an imaginary enveloping plane in the form of a plane of revolution co-axial with said hub and said ring, characterized in that the axis of each tooth crown lies within the nominal plane of the tooth crown concerned, which nominal plane is defined by the perpendicular from said tooth tip or the middle of the cutting edge to said enveloping plane and the tangent to the orbit of said tip or middle.
Claim 2
Dependent Claim
149 words
A cutter head construction for use in a cutter dredger, comprising a plurality of spiral-helical arms which on one end join together at a hub and on the other are connected by means of a supporting ring, to which arms are secured lateral ground working teeth each consisting towards their operative ends of a tooth crown extending from a tooth crown base, the tips or the middles of the cutting edge of the tooth crowns together defining an imaginary enveloping plane in the form of a plane of revolution co-axial with said hub and said ring, characterized in that the axis of each tooth crown lies within the nominal plane of the tooth crown concerned, which nominal plane is defined by the perpendicular from said tooth tip or the middle of the cutting edge to said enveloping plane and the tangent to the orbit of said tip or middle.
Claim 3
Dependent Claim
28 words
A cutter head construction according to claim 1, and provided with teeth having cutting ribs, and wherein each cutting rib is substantially perpendicular to its associated nominal plane.
Claim 4
Dependent Claim
51 words
A cutter head construction according to claim 1, wherein each tooth is secured to the seat of an arm by means of a socket, such seat and such socket being symmetrical relatively to an axis of symmetry lying at least substantially within the nominal plane of the representative tooth tip concerned.
Claim 5
Dependent Claim
54 words
A cutter head construction according to claim 1, wherein each individual tooth crown is secured to a tooth holder of the tooth by connecting and fastening means, said connecting and fastening means being symmetrical relatively to an axis of symmetry lying at least substantially within the nominal plane of the representative tooth tip concerned.
Claim 6
Dependent Claim
19 words
A cutter head construction according to claim 1, wherein the tooth crowns are locally provided with a hard-wearing layer.
Claim 7
Dependent Claim
68 words
A cutter head construction according to claim 1, in which the tooth crowns are set in pOsition by rotation around their axes in such a way that the main axis, which lies in the cross-section of each tooth crown, half-way the length of the crown and perpendicular to the axis of that crown and around which the moment of resistance is maximal, is perpendicular to said nominal plane.
Claim 8
Dependent Claim
40 words
A cutter head construction according to claim 1, in which the point of connection of each arm at the supporting ring is in advance, in direction of rotation, of the point of connection at the hub of the cutter head.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |