US3309062A - Hydraulic jack with safety means - Google Patents
Hydraulic jack with safety means Download PDFInfo
- Publication number
- US3309062A US3309062A US454367A US45436765A US3309062A US 3309062 A US3309062 A US 3309062A US 454367 A US454367 A US 454367A US 45436765 A US45436765 A US 45436765A US 3309062 A US3309062 A US 3309062A
- Authority
- US
- United States
- Prior art keywords
- jack
- nut
- cylinder
- hydraulic
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/30—Constructional features with positive brakes or locks
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B1/3511—Lift-slab; characterised by a purely vertical lifting of floors or roofs or parts thereof
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/163—Jacks specially adapted for working-up building elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/061—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement by unidirectional means
Definitions
- the present invention relates to hydraulic jack of which the distance through which the jack is raised can be accurately controlled, and is particularly suitable for use where the jack has to perform precise lifting steps, for example in raising a building structure by a plurality of jacks which have to be operated in a manner which will maintain the building structure substantially upright while it is being raised.
- the present invention consists in a hydraulic jack wherin a nut, rotatably mounted on a screw thread provided on the jack piston rod or a rod movable therewith, is turned by a pawl and ratchet mechanism or the like actuated by an auxiliary hydraulic device which is hydraulically connected with the jack cylinder so that, as the jack is raised, the nut is turned so that it bears against a part which is fixed relative to the jack cylinder, the movement of the pawl and ratchet mechanism actuating means for controlling the stroke of the jack.
- the means controlling the strokeof the jack conveniently comprise one or more electric switch means which cooperate with the pawl and/ or the ratchet to control a valve regulating the supply of hydraulic fluid to the jack.
- the nut As the nut continuously bears against the jack cylinder or a part which is fixed relative thereto, the nut also serves as a locking device which safeguards the jack against untimely lowering in the event of failure of the hydraulic pressure.
- FIGURE 1 shows schematically a longitudinal section of a hydraulic jack according to the invention.
- FIGURE 2 is a fragmentary plan view, on a larger scale, taken on line IIII in FIGURE 1.
- the hydraulic jack 1 shown comprises a work-cylinder 2 in which slides a piston 3 secured to a piston rod 4.
- the jack 1 is of the angle-acting type, liquid under pressure for lifting the load being supplied to one side 5 of the piston 3 from a source 6 through pipes 7, 8.
- the piston rod 4 is provided with a screw thread on which is threaded a nut 9.
- the nut 9 is movable by auxiliary mechanism which controls the jack stroke, consisting of ratchet teeth 10 provided around the nut 9 and cooperating with a pawl 11, which is actuated by an auxiliary liquid-actuated single-acting cylinder 12 provided with a piston 13.
- auxiliary mechanism which controls the jack stroke, consisting of ratchet teeth 10 provided around the nut 9 and cooperating with a pawl 11, which is actuated by an auxiliary liquid-actuated single-acting cylinder 12 provided with a piston 13.
- a common control valve 16 provides for simultaneous supply of pressure liquid from source 6 through pipes 7 and 8 to the jack cylinder 2, and through pipes 7 and 15 to the auxiliary cylinder 12.
- the control valve 16 is actuated by electrical switches 17, 18 which respectively cooperate with the pawl 11.
- the switch 17 is actuated by pawl 11 which latter effects a change over of control valve 16 whereby the pressure liquid is directed into a return conduit and the pressure in pipes 7, 8 and 15 is released.
- the return movement of the pawl 11 and the piston 13 is effected mechanically by a compression spring 19 which may, for example, be incorporated in the cylinder 12.
- the switch 18 is actuated by the pawl 11 and changes over the control valve 16 to its previous position whereupon pressure can again be built up in pipes 7, 8. 15.
- the nut 9 acts as a locking nut and effects a follow-up movement during the jack stroke by the operation of the auxiliary mechanism whereby to control of the jack stroke, and applies itself against the jack cylinder jacket 2 so that the jack 1, whatever be its position is safeguarded from untimely return if the pressure in the system should fail for any reason.
- a switch as shown at 20 may be used, which is actuated by the angular displacement of the teeth 10 on the nut 9, for example actuated by the respective tips of the teeth to provide a jack stroke corresponding to the rotation of the nut 9 by the pitch of one tooth, or a combination of both switches 17 and 20 is possible, switch 17 then providing an additional safety function.
- the jack cylinder 2 is connected via a non-return valve 21 with pipes 7, 8 and 15, whereby upon release of the pressure in pipes 7, 8 and 15 the auxiliary piston 13 is allowed to return while the pressure in the jack cylinder 2 is maintained.
- a switch 22 acts as a safety contact for ensuring firm application of locking nut 9 against the jack cylinder jacket 2.
- the jack 1 is provided with a relief system (not shown) and means, such as a worm wheel may be provided on a zone of the periphery of nut 9 whereby the nut 9 may be turned backwards, for example by means of a worm fixed in a hand drilling machine or the like, for lowering the jack.
- the auxiliary mechanism for controlling the jack stroke described above is actuated hydraulically and mechanically. It could also be operated entirely hydraulically by using an auxiliary cylinder 12 which is double-acting.
- hydraulic jacks may act as a system, with each jack in the system having its individual supply of pressure liquid, and all electrical switch means 18 actuated by the return of the auxiliary pistons being connected in series, so that in all jacks the building up of the pressure in the pipes 7, 8 and 15 starts simultaneously.
- the jacks which may be hydraulically independent and subject to diflerent loads, at exactly the same average lifting speed.
- Hydraulic jack comprising a jack cylinder having an inlet for hydraulic pressure fluid, a piston movable in said cylinder, a nut rotatably mounted on a screw thread provided on a rod movable with the piston, drive means for turning said nut, as the jack is raised, in a direction to urge the nut against a part which is fixed relative to the cylinder, means for interrupting the supply of hydraulic pressure fluid to said inlet, and means responsive to the turning of the nut through an angle corresponding to a predetermined increment of lift for actuating said interrupting means to interrupt the supply of hydraulic pressure fluid to said inlet.
- a jack as claimed in claim 1, wherein said drive means comprises a pawl cooperating with ratchet teeth associated with the nut, and an auxiliary hydraulic motor connected to the supply of hydraulic pressure fluid to the jack cylinder inlet, said auxiliary hydraulic motor being connected to drive the pawl to turn the nut when hydraulic fluid pressure is supplied thereto and to the jack cylinder inlet, and means for moving the auxiliary 3 hydraulic motor and the pawl in the reverse direction when the supply of hydraulic pressure fluid is interrupted.
- a jack as claimed in claim 2 including at least one electric switch means cooperating with the pawl and rat tribend connected to actuate a control valve in a supply pipe through which hydraulic pressure fluid is supplied to said jack-cylinder inlet and to said auxiliary hydraulic motor.
- valve is connected between. said supply pipe and the 10 OTHELL M. SIMPSON, Examiner.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Types And Forms Of Lifts (AREA)
- Actuator (AREA)
- Fluid-Pressure Circuits (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Accommodation For Nursing Or Treatment Tables (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6405158A NL6405158A (fi) | 1964-05-08 | 1964-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3309062A true US3309062A (en) | 1967-03-14 |
Family
ID=19790044
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US454367A Expired - Lifetime US3309062A (en) | 1964-05-08 | 1965-05-10 | Hydraulic jack with safety means |
US537975A Expired - Lifetime US3396944A (en) | 1964-05-08 | 1966-03-28 | Jacking systems for use in the construction of buildings |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US537975A Expired - Lifetime US3396944A (en) | 1964-05-08 | 1966-03-28 | Jacking systems for use in the construction of buildings |
Country Status (9)
Country | Link |
---|---|
US (2) | US3309062A (fi) |
AT (1) | AT286551B (fi) |
CH (1) | CH444423A (fi) |
DK (1) | DK111636C (fi) |
ES (1) | ES312682A1 (fi) |
FI (1) | FI46053C (fi) |
GB (1) | GB1102274A (fi) |
NL (1) | NL6405158A (fi) |
NO (1) | NO118871B (fi) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3519246A (en) * | 1968-06-28 | 1970-07-07 | Hartley Belding | Hoisting unit |
US3710690A (en) * | 1970-11-16 | 1973-01-16 | Gen Motors Corp | Accelerator |
US4014519A (en) * | 1976-01-30 | 1977-03-29 | Fmc Corporation | Hydraulic jack with mechanical locking device |
US4865293A (en) * | 1987-05-08 | 1989-09-12 | Kayaba Kogyo Kabushiki Kaisha | Hydraulic jack |
US20140061560A1 (en) * | 2011-05-06 | 2014-03-06 | Melchor Gabilondo, S.A. | Hydraulic jack with locking |
US20150224967A1 (en) * | 2014-02-12 | 2015-08-13 | Rodney Lee Rensink | Trailer Jack |
US20160075540A1 (en) * | 2014-09-17 | 2016-03-17 | Actuant Corporation | Portable self-locking lift system |
USD765339S1 (en) | 2014-09-17 | 2016-08-30 | Actuant Corporation | Base member of a portable lift system |
US9568029B2 (en) | 2010-12-22 | 2017-02-14 | Actuant Corporation | Hydraulic cylinder position sensing and locking system and corresponding method |
US9574613B1 (en) * | 2014-06-23 | 2017-02-21 | Stephen A. Youngers | Machine leveling pedestal |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE363798C (sv) * | 1972-05-04 | 1976-09-27 | D V H Johansson | Anordning for att stegvis lyfta laster, spec. stora laster |
US4251974A (en) * | 1979-04-25 | 1981-02-24 | Peter M. Vanderklaauw | Sensing and control apparatus for lifting heavy construction elements |
SE417082B (sv) * | 1979-07-05 | 1981-02-23 | Resmastservice Ab | Anordning for att stegvis lyfta laster, speciellt stora laster, med hjelp av en eller flera domkrafter |
DE3333292A1 (de) * | 1983-09-15 | 1985-04-18 | Walter 7290 Freudenstadt Finkbeiner | Gleichlaufvorrichtung fuer hebeboecke |
US4832315A (en) * | 1988-03-01 | 1989-05-23 | Vanderklaauw Peter M | System for synchronized lifting of heavy building elements |
US4942701A (en) * | 1989-07-24 | 1990-07-24 | Complete Hydraulic Building Systems, Inc. | Hydraulic winch system for use in erecting clear-span, pole-type buildings |
US5970665A (en) * | 1996-10-02 | 1999-10-26 | Oudman; Jack A. | System and method for maintaining a building a structure in a level condition |
CN1080801C (zh) * | 1996-10-07 | 2002-03-13 | 邓庚厚 | 一种由上往下建造建筑物的顶升式建筑法 |
US6860068B2 (en) * | 2001-06-26 | 2005-03-01 | John J. Halloran | Potential energy storage system |
US7392624B2 (en) * | 2003-02-05 | 2008-07-01 | Dwight Eric Kinzer | Modular load-bearing structural column |
TWI663378B (zh) * | 2018-07-27 | 2019-06-21 | 鄭振廷 | 逆打鋼柱垂直校位裝置 |
SE544032C2 (en) * | 2019-08-14 | 2021-11-09 | I & P I Norr Ab | An adjustment system, and adjustable support, a method of orienting an element, and use of such system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1223621A (en) * | 1916-07-24 | 1917-04-24 | Charles F Scherenzel | Lifting-jack. |
US2201189A (en) * | 1937-12-01 | 1940-05-21 | Makaroff | Pneumatic automobile lift |
US2875980A (en) * | 1954-06-25 | 1959-03-03 | Grace Karl | Truck raising and supporting mechanism |
US3104593A (en) * | 1960-12-28 | 1963-09-24 | Regent Jack Mfg Co Inc | Fluid actuators |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975560A (en) * | 1955-09-22 | 1961-03-21 | Lloyd H Leonard | Method of and apparatus for lifting pre-formed slabs |
US3036816A (en) * | 1956-03-20 | 1962-05-29 | Allan H Stubbs | Apparatus for lift-slab building construction |
US3201088A (en) * | 1961-11-13 | 1965-08-17 | Internat Lift Slab Corp | System for elevating building components |
US3327997A (en) * | 1965-02-16 | 1967-06-27 | Zetco Engineering And Tool Com | Sensing apparatus |
-
1964
- 1964-05-08 NL NL6405158A patent/NL6405158A/xx unknown
-
1965
- 1965-05-04 GB GB18835/65A patent/GB1102274A/en not_active Expired
- 1965-05-04 NO NO157935A patent/NO118871B/no unknown
- 1965-05-05 AT AT411165A patent/AT286551B/de not_active IP Right Cessation
- 1965-05-06 FI FI651111A patent/FI46053C/fi active
- 1965-05-07 ES ES0312682A patent/ES312682A1/es not_active Expired
- 1965-05-07 DK DK231565AA patent/DK111636C/da active
- 1965-05-07 CH CH651365A patent/CH444423A/fr unknown
- 1965-05-10 US US454367A patent/US3309062A/en not_active Expired - Lifetime
-
1966
- 1966-03-28 US US537975A patent/US3396944A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1223621A (en) * | 1916-07-24 | 1917-04-24 | Charles F Scherenzel | Lifting-jack. |
US2201189A (en) * | 1937-12-01 | 1940-05-21 | Makaroff | Pneumatic automobile lift |
US2875980A (en) * | 1954-06-25 | 1959-03-03 | Grace Karl | Truck raising and supporting mechanism |
US3104593A (en) * | 1960-12-28 | 1963-09-24 | Regent Jack Mfg Co Inc | Fluid actuators |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3519246A (en) * | 1968-06-28 | 1970-07-07 | Hartley Belding | Hoisting unit |
US3710690A (en) * | 1970-11-16 | 1973-01-16 | Gen Motors Corp | Accelerator |
US4014519A (en) * | 1976-01-30 | 1977-03-29 | Fmc Corporation | Hydraulic jack with mechanical locking device |
US4865293A (en) * | 1987-05-08 | 1989-09-12 | Kayaba Kogyo Kabushiki Kaisha | Hydraulic jack |
US9568029B2 (en) | 2010-12-22 | 2017-02-14 | Actuant Corporation | Hydraulic cylinder position sensing and locking system and corresponding method |
US20140061560A1 (en) * | 2011-05-06 | 2014-03-06 | Melchor Gabilondo, S.A. | Hydraulic jack with locking |
US9278837B2 (en) * | 2011-05-06 | 2016-03-08 | Melchor Gabilondo, S.A. | Hydraulic jack with locking |
US20150224967A1 (en) * | 2014-02-12 | 2015-08-13 | Rodney Lee Rensink | Trailer Jack |
US9574613B1 (en) * | 2014-06-23 | 2017-02-21 | Stephen A. Youngers | Machine leveling pedestal |
US20160075540A1 (en) * | 2014-09-17 | 2016-03-17 | Actuant Corporation | Portable self-locking lift system |
USD765339S1 (en) | 2014-09-17 | 2016-08-30 | Actuant Corporation | Base member of a portable lift system |
US10173872B2 (en) * | 2014-09-17 | 2019-01-08 | Actuant Corporation | Portable self-locking lift system |
Also Published As
Publication number | Publication date |
---|---|
NL6405158A (fi) | 1965-11-09 |
ES312682A1 (es) | 1965-12-16 |
DK111636C (da) | 1968-09-23 |
AT286551B (de) | 1970-12-10 |
DK111636B (fi) | 1968-09-23 |
CH444423A (fr) | 1967-09-30 |
FI46053B (fi) | 1972-08-31 |
NO118871B (fi) | 1970-02-23 |
FI46053C (fi) | 1972-12-11 |
US3396944A (en) | 1968-08-13 |
GB1102274A (en) | 1968-02-07 |
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