US3154006A - Tensioning system for power press tie rods - Google Patents

Tensioning system for power press tie rods Download PDF

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Publication number
US3154006A
US3154006A US230102A US23010262A US3154006A US 3154006 A US3154006 A US 3154006A US 230102 A US230102 A US 230102A US 23010262 A US23010262 A US 23010262A US 3154006 A US3154006 A US 3154006A
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Prior art keywords
frame
nuts
rods
tie rods
spacers
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US230102A
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Theodore F Novak
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Danly Machine Specialties Inc
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Danly Machine Specialties Inc
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Assigned to FIRST NATIONAL BANK OF BOSTON, THE reassignment FIRST NATIONAL BANK OF BOSTON, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). APRIL 30, 1990 Assignors: CONNELL LIMITED PARTNERSHIP
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • B23P19/067—Bolt tensioners
    • B23P19/068—Bolt tensioners by using heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0047—Details of, or accessories for, presses; Auxiliary measures in connection with pressing releasing means for jammed presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/04—Frames; Guides
    • B30B15/042—Prestressed frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/04—Screwed connections specially modified in view of tensile load; Break-bolts for maintaining a tensile load
    • F16B31/043—Prestressed connections tensioned by means of liquid, grease, rubber, explosive charge, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/01—Thread forming, reforming, or cleaning
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • This invention relates generally to power presses and concerns, more particularly, a tensioning system for the tie rods of such presses.
  • One step normally taken when conditioning a large power press for operation is thepre-stressing of the press tie rods so that the tie rods exert a much greater force holding the press frame together than is likely to be developed in the opposite direction during press operation.
  • One expedient for accomplishing this pre-stressing is to heat the tie rods and tighten the tie rod bolts while the rods are thermally expanded. Upon cooling, the rods develop the desired stress. Heating, however, presents many problems since the rods are diflicult to heat, almost impossible to heat uniformly, and often the rod nuts bind on the expanded thread portions of the rods. Moreover, this method requires a long processing period.
  • a further object is to provide a system of the above referred to type that is easy to manipulate, quite trouble free, and which avoids the difficulties with heating and prior hydraulic systems mentioned above.
  • Another object is to provide a tie rod tensioning system as characterized above which readily permits rod tension to be relaxed and the rods even loosened should the press become jammed as a result, for example, of attempting to exceed the capacity of the press.
  • FIGURE 1 is a perspective of a power press embodying the invention with portions broken away;
  • FIG. 2 is an enlarged fragmentary section through the press of FIG. 1 showing a single one of the tie rods;
  • FIG. 3 is a further enlarged section of the lower portion of the tie rods shown in FIG. 2 including a schematic representation of an exemplary hydraulic system for practicing the invention
  • FIG. 4 is an enlarged perspective of one of the spacers embodied in the structure shown in FIG. 3;
  • FIG. 5 is an enlarged perspective of one of the shims embodied in the structure shown in FIG. 3.
  • FIG. 1 there is shown a power press of the type with which the present invention is intended to be used.
  • the press includes frame elements comprising a base 11 supporting a crown 12 on a pair of side members 13 and 14.
  • a vertically shiftable ram 15 operates in opposition to a bolster 16.
  • tie rods 18 are disposed at the four corners of the press and carry upper and lower nuts 19 and 20, respectively, which sandwich the frame elements together.
  • the aim of pre-stressing the press 10 is to tension the rods 18 so as to exert a greater compressive force on the press frame elements than is likely to be developed in the opposite direction by the ram 15 duringpress operation.
  • each tie rod 18 carries a nut embodying a hydraulic motor 22 capable of re acting against the press frame and pre-stressingthe rods 18, whereupon shims 23 are interposed between the frame and the nut to maintain the pre-stress.
  • the motors 22 are linear actuators formed in the lower nuts 20 with each actuator including an annular cavity 25 in which is slidably fitted an annular piston 26. Fluid seals 27 prevent leakage from the cavity 25 past the piston 26, and a passage 28 is formed in the nut 20 so as to permit introduction of fluid under pressure behind the piston.
  • An exemplary hydraulic system for the practice of the invention includes a pump 30 connected to a supply of fluid 31 and coupled by a line 32 to the passage 28.
  • An exhaust valve 33 also connects the line 32 with the fluid supply 31.
  • a line 34 connects the pump 30 to the hydraulic motors 22 in the other nuts 20.
  • the shims 23 are semicircular and two shims are provided for each of the nuts 20. Moreover, the shims are of substantial thickness and are sized in relation to a pair of spacers 40.
  • the spacers are metallic strips intended to be initially placed between the frame and the nuts 20 and are provided with holes 41 so that, when not in use, they can be conveniently stored by being secured to the underside of the nuts 20 by a pair of screws 42, of whch only one is shown.
  • the hydraulic system is then connected to the motors 22 by coupling the lines 32 and 34 to the passages in the nuts 20 corresponding to the passage 28.
  • Fluid is introduced under pressure to the hydraulic motors 22 so that the motors drive the nuts downwardly by reacting against the frame base 11, thus pre-stressing the rods and the press frame.
  • the spacers 40 are then removed and the shims 23 are fitted in between the nuts and the frame.
  • the valve 33 is operated to vent fluid from the motors 22 so that the force exerted by the motors is relaxed while the shims 23 maintain the desired pre-stress.
  • the amount of stress maintained can, of course, be easily calculated and predetermined from the thickness ditference between the shims 23 and the spacers 40.
  • the hydraulic circuitry can be removed if desired. Should it be necessary to remove the stress on the rods 18 and the press frame, the hydraulic circuit is again connected to direct hydraulic fluid to the motors 22 so that sufiicient force is developed to free the shims 23 and permit their removal. Once removed, the pressure in the motors 22 is vented, thus eliminating the stress imposed on the press frame.
  • the method of pre-stressing the frame and tie rods of a power press comprising the steps of threading nuts onto said tie rods, interposing spacers between said nuts and said frame, tightening said nuts against said spacers so that the rods are anchored against said frame, hydraulically driving said nuts from said frame so as to introduce the desired pre-stress in the rods and the frame, remov- 4; ing said spacers, and interposing shims between said nuts and said frame to maintain said pre-stress upon relieving said hydraulic driving force.
  • the method of pre-stressing the frame and tie rods of a power press comprising the steps of threading nuts embodying hydraulic motor elements onto said tie rods, interposing spacers between said nuts and said frame, tightening said nuts against said spacers so that the rods are anchored against said frame, introducing hydraulic fluid under pressure to said motor elements so as to drive said nuts from said frame and thus introduce the desired pre-stress in the rods and the frame, removing said spacers, and interposing shims between said nuts and said frame to maintain said pre-stress upon venting said fluid from the motor elements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Press Drives And Press Lines (AREA)

Description

Oct. 27, 1964 T. F. NOVAK TENSIONING SYSTEM FOR POWER PRESS TIE RODS Filed Oct. 12, 1962 INVENTOR.
United States Patent 3,154,006 TENSIONING SYSTEM FOR POWER PRESS TIE RODS Theodore F. Novak, La Grange Park, 111., assignor to Danly Machine Specialties, Inc., Chicago, 111., a corporation of Illinois Filed Oct. 12, 1962, Ser. No. 230,102
2 Claims. (Cl. 10035) This invention relates generally to power presses and concerns, more particularly, a tensioning system for the tie rods of such presses.
One step normally taken when conditioning a large power press for operation is thepre-stressing of the press tie rods so that the tie rods exert a much greater force holding the press frame together than is likely to be developed in the opposite direction during press operation. One expedient for accomplishing this pre-stressing is to heat the tie rods and tighten the tie rod bolts while the rods are thermally expanded. Upon cooling, the rods develop the desired stress. Heating, however, presents many problems since the rods are diflicult to heat, almost impossible to heat uniformly, and often the rod nuts bind on the expanded thread portions of the rods. Moreover, this method requires a long processing period.
The use of hydraulic pressure has been proposed to prestress the tie rods of a power press, as can be seen by reference to US. Patent No. 2,616,543, issued November 4, 1952, to Danly. Hydraulic systems, however, have required relatively elaborate and expensive components and are subject to leakage problems.
Accordingly, it is the primary aim of the invention to provide a simple and inexpensive, but completely reliable, novel system for pre-stressing or tensioning the tie rods of a power press.
A further object is to provide a system of the above referred to type that is easy to manipulate, quite trouble free, and which avoids the difficulties with heating and prior hydraulic systems mentioned above.
Another object is to provide a tie rod tensioning system as characterized above which readily permits rod tension to be relaxed and the rods even loosened should the press become jammed as a result, for example, of attempting to exceed the capacity of the press.
Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings, in which:
FIGURE 1 is a perspective of a power press embodying the invention with portions broken away;
FIG. 2 is an enlarged fragmentary section through the press of FIG. 1 showing a single one of the tie rods;
FIG. 3 is a further enlarged section of the lower portion of the tie rods shown in FIG. 2 including a schematic representation of an exemplary hydraulic system for practicing the invention;
FIG. 4 is an enlarged perspective of one of the spacers embodied in the structure shown in FIG. 3; and
FIG. 5 is an enlarged perspective of one of the shims embodied in the structure shown in FIG. 3.
While the invention will be described in connection with a preferred embodiment, it will be understood that I do not intend to limit the invention to that embodiment. On the contrary, I intend to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
Turning first to FIG. 1, there is shown a power press of the type with which the present invention is intended to be used. The press includes frame elements comprising a base 11 supporting a crown 12 on a pair of side members 13 and 14. A vertically shiftable ram 15 operates in opposition to a bolster 16.
3,154,005 Patented Oct. 27, 1964.
To hold the frame together when the ram 15 is driven toward the bolster 16 against the work, four tie rods 18 are disposed at the four corners of the press and carry upper and lower nuts 19 and 20, respectively, which sandwich the frame elements together. The aim of pre-stressing the press 10 is to tension the rods 18 so as to exert a greater compressive force on the press frame elements than is likely to be developed in the opposite direction by the ram 15 duringpress operation.
In accordance with the invention, each tie rod 18 carries a nut embodying a hydraulic motor 22 capable of re acting against the press frame and pre-stressingthe rods 18, whereupon shims 23 are interposed between the frame and the nut to maintain the pre-stress. Preferably, the motors 22 are linear actuators formed in the lower nuts 20 with each actuator including an annular cavity 25 in which is slidably fitted an annular piston 26. Fluid seals 27 prevent leakage from the cavity 25 past the piston 26, and a passage 28 is formed in the nut 20 so as to permit introduction of fluid under pressure behind the piston.
An exemplary hydraulic system for the practice of the invention includes a pump 30 connected to a supply of fluid 31 and coupled by a line 32 to the passage 28. An exhaust valve 33 also connects the line 32 with the fluid supply 31. A line 34 connects the pump 30 to the hydraulic motors 22 in the other nuts 20.
In the preferred construction, the shims 23 are semicircular and two shims are provided for each of the nuts 20. Moreover, the shims are of substantial thickness and are sized in relation to a pair of spacers 40. The spacers are metallic strips intended to be initially placed between the frame and the nuts 20 and are provided with holes 41 so that, when not in use, they can be conveniently stored by being secured to the underside of the nuts 20 by a pair of screws 42, of whch only one is shown.
The operation of the above described structure can now be readily appreciated. Upon assembling the frame elements 11-4, the nuts 19 and 20 are fitted onto the tie rods 18. Before the lower nuts 20 are tightened against the frame, a pair of the spacers 40 are interposed between the frame and the lower nuts, whereupon the nuts are tightened so as to hold the frame elements in assembled relation.
The hydraulic system is then connected to the motors 22 by coupling the lines 32 and 34 to the passages in the nuts 20 corresponding to the passage 28. Fluid is introduced under pressure to the hydraulic motors 22 so that the motors drive the nuts downwardly by reacting against the frame base 11, thus pre-stressing the rods and the press frame. The spacers 40 are then removed and the shims 23 are fitted in between the nuts and the frame. The valve 33 is operated to vent fluid from the motors 22 so that the force exerted by the motors is relaxed while the shims 23 maintain the desired pre-stress. The amount of stress maintained can, of course, be easily calculated and predetermined from the thickness ditference between the shims 23 and the spacers 40.
Once the rods 18 are under stress and the shims 23 in place, the hydraulic circuitry can be removed if desired. Should it be necessary to remove the stress on the rods 18 and the press frame, the hydraulic circuit is again connected to direct hydraulic fluid to the motors 22 so that sufiicient force is developed to free the shims 23 and permit their removal. Once removed, the pressure in the motors 22 is vented, thus eliminating the stress imposed on the press frame. Furthermore, by venting the fluid in the motors 22 without repositioning the spacers 40, it is possible to loosen the frame elements beyond the point initially achieved by tightening of the nuts 19, 2%, and this slight additional clearance represented by the thickness of the spacers 40 provides a rapid and convenient expedient for freeing the ram 15, should it become jammed as a result of an overload condition. However, it will also be apparent that the use of the spacers may be dispensed with, and the nuts 20 tightened initially directly against the press frame. A corresponding adjustment in the thickness of the shims 23 must then be made to maintain the same degree of pre-stress.
It can now be seen that the above described structure and procedure for pre-stressing a power press depends upon very simple structure and easily performed steps. Heating problems are entirely avoided and no elaborate hydraulic mechanisms are required. Uniform and balanced stress is obtained since the same hydraulic pressure is introduced to each of the motors 22 in the four lower nuts 20. The use of the spacers 40 permits convenient hydraulic loosening of the frame and the use of thicker, somewhat more manageable shims.
I claim as my invention:
1. The method of pre-stressing the frame and tie rods of a power press comprising the steps of threading nuts onto said tie rods, interposing spacers between said nuts and said frame, tightening said nuts against said spacers so that the rods are anchored against said frame, hydraulically driving said nuts from said frame so as to introduce the desired pre-stress in the rods and the frame, remov- 4; ing said spacers, and interposing shims between said nuts and said frame to maintain said pre-stress upon relieving said hydraulic driving force.
2. The method of pre-stressing the frame and tie rods of a power press comprising the steps of threading nuts embodying hydraulic motor elements onto said tie rods, interposing spacers between said nuts and said frame, tightening said nuts against said spacers so that the rods are anchored against said frame, introducing hydraulic fluid under pressure to said motor elements so as to drive said nuts from said frame and thus introduce the desired pre-stress in the rods and the frame, removing said spacers, and interposing shims between said nuts and said frame to maintain said pre-stress upon venting said fluid from the motor elements.
References Cited in the file of this patent UNITED STATES PATENTS 2,804,674 Long Sept. 3, 1957 2,964,015 Garey Dec. 13, 1960 3,033,597 Miller May 8, 1962 3,097,003 Deve et a1. July 9, 1963 FOREIGN PATENTS 581,753 Germany Aug. 2, 1933

Claims (1)

1. THE METHOD OF PRE-STRESSING THE FRAME AND TIE RODS OF A POWER PRESS COMPRISING THE STEPS OF THREADING NUTS ONTO SAID TIE RODS, INTERPOSING SPACERS BETWEEN SAID NUTS AND SAID FRAME, TIGHTENING SAID NUTS AGAINST SAID SPACERS SO THAT THE RODS ARE ANCHORED AGAINST SAID FRAME, HYDRAULICALLY DRIVING SAID NUTS FROM SAID FRAME SO AS TO INTRODUCE THE DESIRED PRE-STRESS IN THE RODS AND THE FRAME, REMOVING SAID SPACERS, AND INTERPOSING SHIMS BETWEEN SAID NUTS AND SAID FRAME TO MAINTAIN SAID PRES-STRESS UPON RELIEVING SAID HYDRAULIC DRIVING FORCE.
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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424080A (en) * 1967-08-23 1969-01-28 Lambros A Pappas Hydraulic tie rod nut
US3448184A (en) * 1966-04-08 1969-06-03 Rca Corp Method for pressing particulate material
US3462180A (en) * 1965-11-08 1969-08-19 P & O Pilgrim Valve Ltd Tensioning of bolts,studs and like screw-threaded members
US3463044A (en) * 1967-05-05 1969-08-26 Joseph J Rossman Hydraulic holding devices
US3511177A (en) * 1966-08-08 1970-05-12 George Schiff Presses
US3581656A (en) * 1969-06-11 1971-06-01 Verson Allsteel Press Co Prestressed press
US3837694A (en) * 1970-07-08 1974-09-24 Westinghouse Electric Corp Hydraulic head closure mechanism
US3938427A (en) * 1972-07-19 1976-02-17 Vulcan Iron Works, Inc. Percussion hammer
US4182215A (en) * 1978-05-30 1980-01-08 Terra Tek, Inc. Failsafe hydraulic prestressing nut
US4259054A (en) * 1978-12-04 1981-03-31 Wehr Corporation Brick press frame having prestressed columns
US4281580A (en) * 1977-02-02 1981-08-04 Pilgrim Engineering Development Ltd. Tensioning devices
US4854798A (en) * 1987-05-29 1989-08-08 Westinghouse Electric Corp. In-place tensioning washer
US4947673A (en) * 1989-04-13 1990-08-14 Connell Limited Partnership Removable slide presses
US5029461A (en) * 1988-02-18 1991-07-09 N H C, Inc. Hydraulic fastener
US5046906A (en) * 1987-09-29 1991-09-10 Bucknell John W Force applicators
US5285722A (en) * 1992-11-16 1994-02-15 The Minster Machine Company Press shutheight adjustment using hydraulic tie rod assemblies
US5468106A (en) * 1991-09-02 1995-11-21 Pilgrim Moorside Limited Hydraulic tensioning device
US5730569A (en) * 1992-09-17 1998-03-24 Bucknell; John Wentworth Hydraulically assisted fastener element
EP0941833A1 (en) * 1998-03-09 1999-09-15 Battaglia Bergomi, Claudia Control device of the stroke pressure in a conversion press
WO1999061196A3 (en) * 1998-04-28 2000-04-13 Steinbock Machinery Co High temperature bolting system
US6250216B1 (en) 1999-03-19 2001-06-26 The Minster Machine Company Press deflection controller and method of controlling press deflection
US6494465B1 (en) * 1996-07-02 2002-12-17 John Wentworth Bucknell Seals for hydraulic assemblies
US7220119B1 (en) * 2004-02-28 2007-05-22 Force Pro Pre-stressed tie rod and method of manufacture
US20210262503A1 (en) * 2020-02-20 2021-08-26 Siemens Gamesa Renewable Energy Innovation & Technology S.L. Apparatus and method for providing a secure tension connection
US11285573B2 (en) * 2017-12-20 2022-03-29 Superbolt, Inc. Multiple chamber hydraulic multi-jack bolt tensioners
US11292093B2 (en) * 2016-06-16 2022-04-05 Superbolt, Inc. Multi-jack tensioners

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE581753C (en) * 1930-09-13 1933-08-02 Schuler L Ag Press frame for presses with an assembled body and guide tools
US2804674A (en) * 1952-06-16 1957-09-03 Long Construction Company Double head reinforcing rod for pre-stress concrete
US2964015A (en) * 1956-07-16 1960-12-13 Us Electrical Motors Inc Shaft adjusting mechanism
US3033597A (en) * 1960-08-08 1962-05-08 Frederick L B Miller Means for mounting and dismounting gears and the like on shafting
US3097003A (en) * 1962-04-16 1963-07-09 Dominion Eng Works Ltd Hydraulic tightening device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE581753C (en) * 1930-09-13 1933-08-02 Schuler L Ag Press frame for presses with an assembled body and guide tools
US2804674A (en) * 1952-06-16 1957-09-03 Long Construction Company Double head reinforcing rod for pre-stress concrete
US2964015A (en) * 1956-07-16 1960-12-13 Us Electrical Motors Inc Shaft adjusting mechanism
US3033597A (en) * 1960-08-08 1962-05-08 Frederick L B Miller Means for mounting and dismounting gears and the like on shafting
US3097003A (en) * 1962-04-16 1963-07-09 Dominion Eng Works Ltd Hydraulic tightening device

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462180A (en) * 1965-11-08 1969-08-19 P & O Pilgrim Valve Ltd Tensioning of bolts,studs and like screw-threaded members
US3448184A (en) * 1966-04-08 1969-06-03 Rca Corp Method for pressing particulate material
US3511177A (en) * 1966-08-08 1970-05-12 George Schiff Presses
US3463044A (en) * 1967-05-05 1969-08-26 Joseph J Rossman Hydraulic holding devices
US3424080A (en) * 1967-08-23 1969-01-28 Lambros A Pappas Hydraulic tie rod nut
US3581656A (en) * 1969-06-11 1971-06-01 Verson Allsteel Press Co Prestressed press
US3837694A (en) * 1970-07-08 1974-09-24 Westinghouse Electric Corp Hydraulic head closure mechanism
US3938427A (en) * 1972-07-19 1976-02-17 Vulcan Iron Works, Inc. Percussion hammer
US4281580A (en) * 1977-02-02 1981-08-04 Pilgrim Engineering Development Ltd. Tensioning devices
US4182215A (en) * 1978-05-30 1980-01-08 Terra Tek, Inc. Failsafe hydraulic prestressing nut
US4259054A (en) * 1978-12-04 1981-03-31 Wehr Corporation Brick press frame having prestressed columns
US4854798A (en) * 1987-05-29 1989-08-08 Westinghouse Electric Corp. In-place tensioning washer
US5046906A (en) * 1987-09-29 1991-09-10 Bucknell John W Force applicators
US5029461A (en) * 1988-02-18 1991-07-09 N H C, Inc. Hydraulic fastener
US4947673A (en) * 1989-04-13 1990-08-14 Connell Limited Partnership Removable slide presses
US5468106A (en) * 1991-09-02 1995-11-21 Pilgrim Moorside Limited Hydraulic tensioning device
US5730569A (en) * 1992-09-17 1998-03-24 Bucknell; John Wentworth Hydraulically assisted fastener element
US5285722A (en) * 1992-11-16 1994-02-15 The Minster Machine Company Press shutheight adjustment using hydraulic tie rod assemblies
US6494465B1 (en) * 1996-07-02 2002-12-17 John Wentworth Bucknell Seals for hydraulic assemblies
EP0941833A1 (en) * 1998-03-09 1999-09-15 Battaglia Bergomi, Claudia Control device of the stroke pressure in a conversion press
WO1999061196A3 (en) * 1998-04-28 2000-04-13 Steinbock Machinery Co High temperature bolting system
US6199453B1 (en) * 1998-04-28 2001-03-13 Steinbock Machinery Co. High temperature bolting system
US6250216B1 (en) 1999-03-19 2001-06-26 The Minster Machine Company Press deflection controller and method of controlling press deflection
US7220119B1 (en) * 2004-02-28 2007-05-22 Force Pro Pre-stressed tie rod and method of manufacture
US11292093B2 (en) * 2016-06-16 2022-04-05 Superbolt, Inc. Multi-jack tensioners
US11285573B2 (en) * 2017-12-20 2022-03-29 Superbolt, Inc. Multiple chamber hydraulic multi-jack bolt tensioners
US20210262503A1 (en) * 2020-02-20 2021-08-26 Siemens Gamesa Renewable Energy Innovation & Technology S.L. Apparatus and method for providing a secure tension connection

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