EP0037298A1 - Treuil à entraînement pas à pas à dispositif de sécurité - Google Patents

Treuil à entraînement pas à pas à dispositif de sécurité Download PDF

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Publication number
EP0037298A1
EP0037298A1 EP81400356A EP81400356A EP0037298A1 EP 0037298 A1 EP0037298 A1 EP 0037298A1 EP 81400356 A EP81400356 A EP 81400356A EP 81400356 A EP81400356 A EP 81400356A EP 0037298 A1 EP0037298 A1 EP 0037298A1
Authority
EP
European Patent Office
Prior art keywords
clamps
detection member
winch according
support
pliers
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.)
Ceased
Application number
EP81400356A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernard Fougea
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coignet SA
Original Assignee
Coignet SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Coignet SA filed Critical Coignet SA
Publication of EP0037298A1 publication Critical patent/EP0037298A1/fr
Ceased legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/20Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
    • E04G11/22Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
    • E04G11/24Construction of lifting jacks or climbing rods for sliding forms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F1/00Devices, e.g. jacks, for lifting loads in predetermined steps
    • B66F1/02Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
    • B66F1/025Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the devices being operated by fluid pressure

Definitions

  • the present invention relates to a winch with stepping drive with safety device, this winch being of the type in which a cable or other traction support is actuated relative to two sets of clamps, one of which is fixed relative to a reference location and the other mobile, the clamps of one of the sets must be in a tight position against the cable or support while those of the other set are in the released position while the two sets are distant from one the other under the action of motor means such as at least one jack, the clamps initially tightened then being placed in the released position and the clamps initially released having to be in the clamped position while the two games are brought together. 'other under the action of said motor means.
  • Winches of this type such as gripper elevators are commonly used in construction techniques, but their operation can be seriously disturbed if, as a result of an incident, the two sets of grippers are simultaneously in the released position , if only for a short time; in this case, the downward movement of the cable or support can occur quickly and suddenly with extremely serious consequences.
  • these winches include safety devices preventing any beginning of loosening of a set of pliers until the other set is not perfectly tight; these safety devices are generally operated in function tion of the fluid pressure in pre-tightening cylinders against the cable secured to at least one of the sets of clamps; this results in an indication of pressure, and, only if there is pressure, the clamps to be released are actuated; however, it may happen that an anomaly occurs in the operation of the pre-tightening cylinders, causing the loosening of one set of pliers while the other is not yet fully tightened.
  • the object of the present invention is to remedy this drawback and for this purpose relates to a winch with stepping drive with safety device, of the type according to which a traction support such as a cable is actuated by a first set of movable pliers relative to a second set of clamps fixed relative to a reference location, one of the sets of clamps being tightened against the traction support and the other loosened during the separation of the two sets, the set tightened and the set loosened during their distance from each other being respectively loosened and tightened during their approaching winch characterized in that at least one set of clamps is provided with a safety device comprising at least one member for detecting movement of the support of traction to detect any movement of the latter at the level of this clearance when said clearance should be tightened, and a closure release member cooperating with the scroll detection member to then tighten the other j had pliers.
  • the elevator-tractor described here and intended to raise a cable A comprises for this purpose two closing members 1, 2 for clamps 3, 4,. Placed at a certain distance one above the other, between which are inserted said respective clamps 3, 4 formed in the form of corners and arranged around the cable A so as to be capable of coming against it in the clamped position, or to pass into the loosened position.
  • the clamped or loosened position is obtained thanks to the "wedge" effect caused by the cooperation of inclined surfaces provided respectively inside the closing members 1, 2 and outside of the clamps 3, 4.
  • the lower closure member 2 is assumed to be fixed relative to a frame not shown, the upper closure member 1 being made movable relative to it by at least one hydraulic or pneumatic cylinder (also not represented).
  • the two sets of closure members 1, 2 and clamps 3, 4 are in the clamped position, the cylinder being in the retracted position so that these games are relatively close to each other ;
  • FIG. 2 shows a phase during which, the jacks being in extension, the lower clearance 2, 4 is in the released position, and the upper clearance 1, 3 in the tight position, which causes the rope to rise in relation at the lower clearance 2, 4 therefore with respect to the frame;
  • FIG. 1 shows a phase during which, the jacks being in extension, the lower clearance 2, 4 is in the released position, and the upper clearance 1, 3 in the tight position, which causes the rope to rise in relation at the lower clearance 2, 4 therefore with respect to the frame;
  • FIG. 3 again shows the two sets of closing members 1, 2 and of clamps 3, 4 in the tight position, the jack being this time in the extended position, so that these games are in their position of maximum separation ;
  • FIG. 4 shows the phase during which the jack is in retraction, the lower clearance 2, 4 is in the clamped position and the upper clearance 1, 3 in the released position, so that the latter returns to its initial position from the FIG. 1, the cable A being held in position by virtue of the lower clearance 2, 4.
  • Pre-tightening cylinders giving an indication of pressure and allowing, if there is pressure on a set of pliers, therefore in principle tightening against the cable A, to loosen the other set of pliers, are not shown.
  • the safety device shown in FIGS. 5 to 8 is intended, in the event of false information given by the pre-tightening cylinders, to stop the running of the cable A between the sets of pliers 3, 4; for this purpose, provision is made to detect any movement of the cable by reference to the set of pliers assumed to be closed in order to trigger the closing of the second set of pliers (that is to say of the one which has just opened) and to stop the cable run.
  • the lift-tractor the operation of which has been described above, comprises at least one safety device of this type, for example one or more devices on each set of pliers.
  • This device comprises, in a housing 11, a feeler 12 intended to come into contact with the cable A, secured to a substantially horizontal lever 13 fixed to the upper part of one or more deformable supports 14, for example made of neoprene, carried by said housing 11.
  • the housing 11 also carries, under the lever 13, a switch 15 (here a micro-switch) provided with a pressure contact 151 at its upper part.
  • the probe 12 is constituted by a jaw having a partially cylindrical surface, opposite the cable A, of the same radius as that of this cable.
  • This jaw is positioned so that when the corresponding clamp is in the released position ( Figure 6) or even in the clamped position ( Figure 7) without cable running, the generatrix of its cylindrical surface is slightly inclined relative to the longitudinal axis of the cable, the lever 13 is horizontal, and the deformable support is not deformed (or is slightly deformed, in the tight position), the force exerted on it being only radial; on the other hand, the positioning is such that in the tight position with the cable A running ( Figure 8), the cylindrical surface of the jaw is almost entirely in contact with that of the cable A under the action of the movement of the cable, the lever 13 being inclined downwards towards of said cable, the support 14 being deformed, the inclination of the lever 13 being such that the contact 151 of the breaker 15 is pressed and maintained in this position by said lever 13.
  • the breaker 15 being inserted in an appropriate circuit, the information corresponding to the fact that it is pressed is transmitted to the clamp closing members, causing the closure of the other set of pliers, which had just opened.
  • the stroke of the lever 13 is limited by a stop 16, in order to avoid the crushing of the breaker 15 or any deformation of the housing 11 and the tearing of the deformable support 14.
  • the lever 13 is formed under the shape of a rectangular plate, and two deformable supports 14 are provided to fix this lever 13.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Electric Cable Installation (AREA)
  • Mechanical Control Devices (AREA)
EP81400356A 1980-03-20 1981-03-09 Treuil à entraînement pas à pas à dispositif de sécurité Ceased EP0037298A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8006190 1980-03-20
FR8006190A FR2478612A1 (fr) 1980-03-20 1980-03-20 Treuil a entrainement pas a pas a dispositif de securite

Publications (1)

Publication Number Publication Date
EP0037298A1 true EP0037298A1 (fr) 1981-10-07

Family

ID=9239872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400356A Ceased EP0037298A1 (fr) 1980-03-20 1981-03-09 Treuil à entraînement pas à pas à dispositif de sécurité

Country Status (2)

Country Link
EP (1) EP0037298A1 (enExample)
FR (1) FR2478612A1 (enExample)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB838373A (en) * 1957-07-05 1960-06-22 Edouard Dubois Improvements in or relating to means for controlling jacks for moving sliding moulds
US2944403A (en) * 1953-09-04 1960-07-12 Raymond Int Inc Hydraulic jacking assembly for marine platforms
FR1320847A (fr) * 1962-01-31 1963-03-15 Perfectionnements apportés au contrôle du niveau de vérins pour coffrages glissants
US3247930A (en) * 1964-03-31 1966-04-26 Dresser Ind Crane cab safety brake
US3250402A (en) * 1964-03-17 1966-05-10 Dresser Ind Safety brake
US3685801A (en) * 1969-12-22 1972-08-22 Ahlgren Nils H Jack assemblies
FR2257044A1 (en) * 1974-01-09 1975-08-01 Mediterranee Const Navales Ind Safety stop for lift or escalator - has rack oscillating cranked sprung lever to rack locking position

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944403A (en) * 1953-09-04 1960-07-12 Raymond Int Inc Hydraulic jacking assembly for marine platforms
GB838373A (en) * 1957-07-05 1960-06-22 Edouard Dubois Improvements in or relating to means for controlling jacks for moving sliding moulds
FR1320847A (fr) * 1962-01-31 1963-03-15 Perfectionnements apportés au contrôle du niveau de vérins pour coffrages glissants
US3250402A (en) * 1964-03-17 1966-05-10 Dresser Ind Safety brake
US3247930A (en) * 1964-03-31 1966-04-26 Dresser Ind Crane cab safety brake
US3685801A (en) * 1969-12-22 1972-08-22 Ahlgren Nils H Jack assemblies
FR2257044A1 (en) * 1974-01-09 1975-08-01 Mediterranee Const Navales Ind Safety stop for lift or escalator - has rack oscillating cranked sprung lever to rack locking position

Also Published As

Publication number Publication date
FR2478612B1 (enExample) 1982-06-18
FR2478612A1 (fr) 1981-09-25

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19811029

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Effective date: 19831012

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Inventor name: FOUGEA, BERNARD