Patent US2491986A successfully refreshed from Google Patents.
Patent US3970137A successfully refreshed from Google Patents.
US3970137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing and transferring casting moulds
Assignee: Heinrich Wagner Maschinenfabrik
•
Filing: 1975-02-10
•
Granted: 1976-07-20
•
Expires: 1995-02-10
Abstract
Abstract An apparatus for producing and transferring casting moulds utilizing binderless sand subjected to a reduced pressure. The apparatus is comprised of a travelling gripper which is arranged to be raised and lowered and which is provided with two couplings to hold a moulding box. The couplings are rotatable about a horizontally extending axis with one coupling being connected to a vacuum pipe for evacuating the moulding box.
Inventors
- 👤 Herbert Grolla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:07
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
Apparatus for producing and transferring casting moulds utilising binderless sand subjected to a reduced pressure, said apparatus comprising a travelling gripper which is arranged to be raised and lowered and which is provided with two couplings to hold a moulding box, said couplings being rotatable about a horizontally extending axis, and one coupling being connected to a vacuum pipe for evacuating the moulding box.
Claim 2
Dependent Claim
64 words
Apparatus for producing and transferring casting moulds utilising binderless sand subjected to a reduced pressure, said apparatus comprising a travelling gripper which is arranged to be raised and lowered and which is provided with two couplings to hold a moulding box, said couplings being rotatable about a horizontally extending axis, and one coupling being connected to a vacuum pipe for evacuating the moulding box.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1, wherein one of the two couplings is connected to means operable to rotate the moulding box about said horizontally extending axis.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 2, wherein said means comprises a toothed rack provided on a piston rod, and a pinion connected to the other of the couplings.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 1, wherein each of the two couplings is operated by a respective double-action cylinder.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |