Patent US3727772A successfully refreshed from Google Patents.
US3727772A
Expired / Lapsed
US
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Apparatus for centering and clamping elongated workpieces
Assignee: TH Kieserling and Albrecht GmbH and Co
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Filing: 1971-11-29
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Granted: 1973-04-17
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Expires: 1991-11-29
Abstract
Abstract Apparatus for centering and clamping tubes, rods or like workpieces has two double-acting cylinders which are reciprocable along parallel feed screws rotatably mounted in the frame of the apparatus. The feed screws have oppositely inclined mirror symmetrical threads meshing with internal threads provided on nuts which are adjustably fastened to the cylinders. The cylinders support mirror symmetrical work-engaging claws and receive pistons which are connected to each other by a piston rod extending midway between and being parallel with the feed screws. When the chambers of the cylinders receive a pressurized fluid so that the cylinders and their claws move toward or away from each other, the feed screws rotate and insure that the cylinders move at the same rate.
Inventors
- 👤 K Pauls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:55
CPC Classifications
B; B25; B25B; B25B1/00; B25B1/06; B25B1/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
In an apparatus for centering and clamping elongated workpieces, such as tubes or rods, a combination comprising a support; a feed screw having spaced outer portions rotatably mounted in said support and spaced first and second inner portions disposed between said outer portions and having oppositely inclined mirror symmetrical threads; first and second cylinders reciprocably supported by said feed screw and having first and second nuts respectively meshing with said first and second inner portions to rotate said feed screw in response to movement of said cylinders toward or away from each other; first and second work-engaging elements respectively provided on said first and second cylinders; and means for moving said cylinders lengthwise of said feed screw, including interconnected pistons reciprocably received in said cylinders and means for effecting controlled admission of a pressurized fluid into and evacuation of fluid from said cylinders.
Claim 2
Dependent Claim
143 words
In an apparatus for centering and clamping elongated workpieces, such as tubes or rods, a combination comprising a support; a feed screw having spaced outer portions rotatably mounted in said support and spaced first and second inner portions disposed between said outer portions and having oppositely inclined mirror symmetrical threads; first and second cylinders reciprocably supported by said feed screw and having first and second nuts respectively meshing with said first and second inner portions to rotate said feed screw in response to movement of said cylinders toward or away from each other; first and second work-engaging elements respectively provided on said first and second cylinders; and means for moving said cylinders lengthwise of said feed screw, including interconnected pistons reciprocably received in said cylinders and means for effecting controlled admission of a pressurized fluid into and evacuation of fluid from said cylinders.
Claim 3
Dependent Claim
111 words
A combination as defined in claim 1, further comprising a second feed screw having spaced outer portions rotatably mounted in said support and spaced first and second inner portions disposed between said last mentioned outer portions and provided with oppositely inclined mirror symmetrical threads, said second feed screw being parallel with said first mentioned feed screw and said first and second cylinders respectively having additional first and second nuts meshing with said first and Second inner portions of said second feed screw so that said second feed screw shares all rotary movements of said first mentioned feed screw in response to movement of said cylinders toward or away from each other.
Claim 4
Dependent Claim
38 words
A combination as defined in claim 2, wherein said means for moving said cylinders further comprises a piston rod having ends connected with said pistons and being disposed midway between and extending in parallelism with said feed screws.
Claim 5
Dependent Claim
36 words
A combination as defined in claim 2, wherein at least said first nuts are angularly adjustable with reference to the respective cylinder and further comprising fastener means for securing said first nuts to the respective cylinder.
Claim 6
Dependent Claim
22 words
A combination as defined in claim 2, wherein the axes of said feed screws are disposed in a common substantially horizontal plane.
Claim 7
Dependent Claim
15 words
A combination as defined in claim 1, wherein said work-engaging elements are mirror symmetrical claws.
Claim 8
Dependent Claim
13 words
A combination as defined in claim 1, wherein said cylinders are double-acting cylinders.
Claim 9
Dependent Claim
22 words
A combination as defined in claim 1, wherein said support comprises antifriction bearing means for said outer portions of said feed screw.
Claim 10
Dependent Claim
26 words
A combination as defined in claim 1, further comprising bearing means provided on said support and rotatably supporting said feed screw intermediate said inner portions thereof.
Claim 11
Dependent Claim
16 words
A combination as defined in claim 1, further comprising means for delivering workpieces between said elements.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |