Patent US3099174A successfully refreshed from Google Patents.
Patent US4386072A successfully refreshed from Google Patents.
Patent US4229908A successfully refreshed from Google Patents.
US4229908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatic joint machining in heavily thick cylinders
Assignee: Ansaldo SpA
•
Filing: 1978-10-24
•
Granted: 1980-10-28
•
Expires: 1998-10-24
Abstract
Abstract The apparatus carried by a suitable handling device, and comprising a first base structure attached to the handling device and provided with vertical guides for the sliding of a first carriage, a second base structure attached to said carriage and provided with horizontal guides for the sliding of a second carriage, and an operating head carried by the second carriage through a hydropneumatic device comprising at least one double-acting penumatic cylinder for supporting said head and having its axis vertically arranged, and a hydraulic damper connected between said second carriage and operating head, the lower chamber of the operating head supporting pneumatic cylinder being supplied with a first value of pressure as to cause a fast lifting of said head, while the upper chamber of the pneumatic cylinder is supplied with a value of pressure at a lower level as to annul the upward thrust, at the same time supplying said operating head with a downward operative thrust of a constant value.
Inventors
- 👤 Cesare Panzeri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:51
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
An apparatus for the automatic machining of joints in cylinders comprising a handling device, a first base structure attached to said handling device and provided with vertical guides, a first carriage slidable on the said vertical guides, a second base structure attached to said carriage and provided with horizontal guides, a second carriage slidable on said horizontal guides, a hydropneumatic device mounted on said second carriage and comprising at least one double acting pneumatic piston and cylinder assembly and a hydraulic damper, an operating head, and means attaching said operating head to said hydropneumatic device, said attaching means including means for angularly orienting said operating head relative to said second carriage about a vertical axis, said pneumatic piston and cylinder assembly having a lower chamber and an upper chamber, means for supplying said lower chamber with fluid at a first pressure to cause a fast lifting of said head, and means for supplying said upper chamber with fluid at a second pressure lower than said first pressure to annul the upward thrust while supplying said operating head with a downward operative thrust of a constant value.
Claim 2
Independent Claim
186 words
An apparatus for the automatic machining of joints in cylinders comprising a handling device, a first base structure attached to said handling device and provided with vertical guides, a first carriage slidable on the said vertical guides, a second base structure attached to said carriage and provided with horizontal guides, a second carriage slidable on said horizontal guides, a hydropneumatic device mounted on said second carriage and comprising at least one double acting pneumatic piston and cylinder assembly and a hydraulic damper, an operating head, and means attaching said operating head to said hydropneumatic device, said attaching means including means for angularly orienting said operating head relative to said second carriage about a vertical axis, said pneumatic piston and cylinder assembly having a lower chamber and an upper chamber, means for supplying said lower chamber with fluid at a first pressure to cause a fast lifting of said head, and means for supplying said upper chamber with fluid at a second pressure lower than said first pressure to annul the upward thrust while supplying said operating head with a downward operative thrust of a constant value.
Claim 3
Dependent Claim
33 words
The apparatus as defined in claim 1 including a pair of said double acting pneumatic piston and cylinder assemblies and ball recirculating bushes between the piston rods and cylinder heads of said assemblies.
Claim 4
Dependent Claim
47 words
The apparatus as defined in claim 2 wherein said attaching means comprises bracket means attached to the piston rods of said assemblies and a third carriage attached to said operating head and wherein said angular orienting means is connected between said third carriage and said bracket means.
Claim 5
Dependent Claim
35 words
The apparatus as defined in claim 1 including control means for said second carriage comprising a stepping motor and a control circuit for said motor connected to a transducer for axial displacement of the joint.
Claim 6
Dependent Claim
25 words
The apparatus as defined in claim 1 wherein said hydraulic damper comprises a cylinder having chambers connected in a closed circuit comprising opposing throttling valves.
Claim 7
Dependent Claim
16 words
The apparatus as defined in claim 5 including pneumatically driven shuttle valves in said closed circuit.
References Cited (Backward Citations)
US2243405A
Cited
US2558983A
Cited
US2558943A
Cited
US2600481A
Cited
US2694278A
Cited
US2828586A
Cited
SU580077A1
Cited
US3992818A
Cited
US4094102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |