Patent US3877326A successfully refreshed from Google Patents.
US3877326A
Expired / Lapsed
US
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Tensioning apparatus
Assignee: Mhwirth GmbH
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Filing: 1973-12-03
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Granted: 1975-04-15
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Expires: 1993-12-03
Abstract
Abstract This invention relates to an apparatus for tensioning fastening members, such as screw bolts provided with fixing nuts, and include a supporting frame for tensioning assemblies which can be set down on the screw bolts and each assembly has at least one cylinder with a piston sliding within the latter, which piston acts on a force transmitting element, such as a nut, which can be screwed down onto a screw bolt to be tensioned and means are provided on the supporting frame which serve to turn the fixing nuts on the screw bolts and the apparatus also comprises motor driven parts for rotating the force transmitting elements.
Inventors
- 👤 Gerhard Kock
- 👤 Gunter Wallrafen
- 👤 Erhard Hoffmann
- 👤 Hubert Buschfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:52
CPC Classifications
B; B25; B25B; B25B29/00; B25B29/02; B23; B23P; B23P19/00; B23P19/04; B23P19/06; B23P19/067
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
162 words
Apparatus for simultaneously tensioning a number of screw bolts, necked-down bolts, tie barS or other elements, provided with fixing nuts, the apparatus including a supporting frame for tensioning assemblies, which can be set down on the screw bolts, and each of which has at least one cylinder with a piston slidable within the latter, which piston acts on a forcetransmitting element, particularly in the form of a nut, which can be screwed down on to the screw bolt which is to be tensioned, and the apparatus being further provided with means located on the support frame and serving to turn the fixing nuts on the screw bolts, wherein the apparatus comprises motor-driven parts for rotating the force-transmitting elements, so as to screw or unscrew the latter on to or from the screw bolts, and holding devices for the fixing nuts on the supporting frame including means for retaining the nuts on the frame after they have been released from the screw bolts.
Claim 2
Dependent Claim
162 words
Apparatus for simultaneously tensioning a number of screw bolts, necked-down bolts, tie barS or other elements, provided with fixing nuts, the apparatus including a supporting frame for tensioning assemblies, which can be set down on the screw bolts, and each of which has at least one cylinder with a piston slidable within the latter, which piston acts on a forcetransmitting element, particularly in the form of a nut, which can be screwed down on to the screw bolt which is to be tensioned, and the apparatus being further provided with means located on the support frame and serving to turn the fixing nuts on the screw bolts, wherein the apparatus comprises motor-driven parts for rotating the force-transmitting elements, so as to screw or unscrew the latter on to or from the screw bolts, and holding devices for the fixing nuts on the supporting frame including means for retaining the nuts on the frame after they have been released from the screw bolts.
Claim 3
Dependent Claim
38 words
Apparatus according to claim 1, wherein a rotatable actuating member is provided for each force-transmitting element which can be screwed on to a screw bolt, this actuating member having teeth which engage in teeth of the force-transmitting elements.
Claim 4
Dependent Claim
37 words
Apparatus according to claim 2, wherein each actuating member can be driven by means of a motor, which is associated with the actuating member, is disposed on the supporting frame, and whose direction of rotation is reversible.
Claim 5
Dependent Claim
35 words
Apparatus according to claim 1, wherein there is provided, as motor drives for rotating the pressure-transmitting element, motors which are driven by fluid pressure medium and which, in particular, function according to the displacement principle.
Claim 6
Dependent Claim
28 words
Apparatus according to claim 3, wherein at least one switching- or control element is associated with each motor, and serves to effect the working condition of the motor.
Claim 7
Dependent Claim
44 words
Apparatus according to claim 1, wherein there is provided, as actuating members for rotating the force-transmitting elements, hollow, cylindrical members, which are provided with inner teeth, and are mounted on the supporting frame or on a part which is attached to the supporting frame.
Claim 8
Dependent Claim
43 words
Apparatus according to claim 1, wherein each fixing nut is provided with a motor, which is arranged on the supporting frame, is reversible in respect of its direction of rotation, and serves as a rotary drive for tightening and untightening the fixing nuts.
Claim 9
Dependent Claim
31 words
Apparatus according to claim 7, wherein the motors for the fixing nuts are operable with a fluid pressure medium and, in particular, are motors which function according to the displacement principle.
Claim 10
Dependent Claim
30 words
Apparatus according to claim 7, wherein there is associated with each fixing nut motor at least one switching-or control-element for affecting the operating condition of the fixing nut motor concerned.
Claim 11
Dependent Claim
37 words
Apparatus according to claim 1, wherein an actuating pinion wheel is associated with each fixing nut, is rotatable by means of a fixing nut motor, and has teeth which mesh with external teeth of the fixing nut.
Claim 12
Dependent Claim
24 words
Apparatus according to claim 10, wherein each actuating pinion wheel is arranged on a shaft which is mounted for rotation in the supporting frame.
Claim 13
Dependent Claim
23 words
Apparatus according to claim 10, wherein the actuating pinion wheels are axially supported, on their shafts, by resilient elements, in particular compression springs.
Claim 14
Dependent Claim
46 words
Apparatus according to claim 1, wherein a stepped ring is arranged on each screw bolt, is axially shiftable relative to the screw bolt, and a portion of this ring lying closer to the fixing nut has a smaller diameter than the screw-thread of the fixing nut.
Claim 15
Dependent Claim
28 words
Apparatus according to claim 1, wherein a monitoring device is provided for monitoring the condition of movement of the fixing nuts and/or of the pressure- or force-transmitting elements.
Claim 16
Dependent Claim
35 words
Apparatus according to claim 14, wherein that the operating condition of the fixing nut motors and/or of the motors for the actuating members can be controlled in response to a signal of the monitoring device.
Claim 17
Dependent Claim
33 words
Apparatus according to claim 14, wherein a sensing device is provided for sensing marks or the like on a part, which is rotatable synchronously with the fixing nut or with the force-transmitting element.
Claim 18
Dependent Claim
33 words
Apparatus according to claim 16, wherein an indicating (display) device is provided for the signals which have been generated by the sensing devices and which may possibly have been processed or further processed.
Claim 19
Dependent Claim
28 words
Apparatus according claim 1, wherein the supporting frame comprises a supporting device, by means of which the frame can be raised and lowered relative to a supporting surface.
Claim 20
Dependent Claim
16 words
Apparatus according to claim 18, wherein the supporting apparatus contains at least three double-acting piston/cylinder assemblies.
Claim 21
Dependent Claim
18 words
Apparatus according to claim 19, wherein piston rods of the piston/cylinder assembly constitute legs of the supporting apparatus.
Claim 22
Dependent Claim
49 words
Apparatus according to claim 1, wherein each holding device comrpises a holding member which is shiftable from an outer, inoperative position into an inner, operative position in which the holding member is in alignment beneath the path of movement of the fixing nut when released from the screw bolts.
Claim 23
Dependent Claim
45 words
Apparatus according to claim 21, wherein the holding member includes means spring-loading the member toward the inoperative position, and a rotatable eccentric operatively connected to the holding member for overcoming the spring loading for disposing the holding member in a position to support a nut.
Claim 24
Dependent Claim
21 words
Apparatus according to claim 22, including common driving means operatively connected to said eccentrics for simultaneously operating the respective holding members.
Claim 25
Dependent Claim
27 words
Apparatus according to claim 23, wherein the eccentrics are mounted for rotation on shafts, said shafts having journaled thereon actuating pinion wheels for engaging the fixing nuts.
Claim 26
Dependent Claim
35 words
Apparatus according to claim 1, wherein the screw bolts each have a cylindrical screwthread, for accommodating which serve to tighten the fixing nut, a portion including a conical screwthread, which merges into the cylindrical threwthread.
Claim 27
Dependent Claim
47 words
Apparatus according to claim 1, including extension pieces which are attached to the bolts by a screwthreaded connection, each extension piece having a cylindrical screwthread accommodating a nut which comprises the force-transmitting element and including a region having a conical screwthread, which merges into the cylindrical screwthread.
Claim 28
Dependent Claim
20 words
Apparatus according to claim 1, including an extension piece having a conical screwthread for axial connection to the screw bolts.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |