US4175453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for tensioning several screw bolts
Assignee: Kraftwerk Union AG
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Filing: 1978-03-28
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Granted: 1979-11-27
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Expires: 1998-03-28
Abstract
Abstract A device for tensioning a screw bolt wherein the device comprises a lifting cylinder having a piston and arranged on a support ring and means responsive to the piston for engaging the screw bolt in a positive locking manner including: a first member engaged by the piston; a second member hinged to the first member; and guide surfaces for pressing the second member against an engagement surface of the screw bolt in a positive engaging and self-locking manner.
Inventors
- 👤 Gerhard Exner
- 👤 Volfango Festinori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:57
CPC Classifications
B; B25; B25B; B25B29/00; B25B29/02; B23; B23P; B23P19/00; B23P19/04; B23P19/06; B23P19/067
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
In a device for tensioning a screw bolt of a nut and screw bolt combination, the device comprising: a support ring having recesses for receiving said screw bolt and nut; a turning unit fastened to said ring for rotating said nut; a lifting cylinder arranged on said support ring and having a piston, the improvement comprising means coupled to the piston for engaging the screw bolt in a positive locking manner in response to only a tensioning movement of the piston, said means including: (a) a first member connected to the piston for movement therewith in the direction of tensioning; (b) a second member hinged to said first member; (c) an extending portion of said screw bolt having thereon an engagement surface; and (d) guide surfaces for pressing said second member against said engagement surface of said screw bolt in a positively-engaging and self-locking manner.
Claim 2
Dependent Claim
145 words
In a device for tensioning a screw bolt of a nut and screw bolt combination, the device comprising: a support ring having recesses for receiving said screw bolt and nut; a turning unit fastened to said ring for rotating said nut; a lifting cylinder arranged on said support ring and having a piston, the improvement comprising means coupled to the piston for engaging the screw bolt in a positive locking manner in response to only a tensioning movement of the piston, said means including: (a) a first member connected to the piston for movement therewith in the direction of tensioning; (b) a second member hinged to said first member; (c) an extending portion of said screw bolt having thereon an engagement surface; and (d) guide surfaces for pressing said second member against said engagement surface of said screw bolt in a positively-engaging and self-locking manner.
Claim 3
Dependent Claim
42 words
In a device in accordance with claim 1, the improvement wherein: said second member comprises a clamping jaw having projections; said engagement surface comprises corresponding projections on said extending portion; and said guide surfaces comprise template slots associated with said clamping jaw.
Claim 4
Dependent Claim
34 words
In a device in accordance with claim 2, the improvement wherein: said first member includes a tie rod; and said device further includes a pivot pin connecting said clamping jaw to said tie rod.
Claim 5
Dependent Claim
59 words
In a device in accordance with claim 1, the improvement wherein said first member comprises a return piston disposed upon said piston and a ring movably arranged in said return piston; said second member includes at least three conic segments hinged to said ring; and said guidance surfaces are formed by surfaces at the upper end of said piston.
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |