US3294255A - Lifting mechanism - Google Patents

Lifting mechanism Download PDF

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Publication number
US3294255A
US3294255A US399290A US39929064A US3294255A US 3294255 A US3294255 A US 3294255A US 399290 A US399290 A US 399290A US 39929064 A US39929064 A US 39929064A US 3294255 A US3294255 A US 3294255A
Authority
US
United States
Prior art keywords
base
plate
arms
arm
driving shaft
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
Application number
US399290A
Other languages
English (en)
Inventor
Cabaret Jean
Gerard Victor
Valentin Andre
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Application granted granted Critical
Publication of US3294255A publication Critical patent/US3294255A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F7/00—Shielded cells or rooms
    • G21F7/06—Structural combination with remotely-controlled apparatus, e.g. with manipulators
    • G21F7/063—Remotely manipulated measuring or controlling devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J13/00—Covers or similar closure members for pressure vessels in general
    • F16J13/02—Detachable closure members; Means for tightening closures
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C13/00—Pressure vessels; Containment vessels; Containment in general
    • G21C13/02—Details
    • G21C13/06—Sealing-plugs
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/02—Details of handling arrangements
    • G21C19/10—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F7/00—Shielded cells or rooms
    • G21F7/005—Shielded passages through walls; Locks; Transferring devices between rooms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20558—Variable output force
    • Y10T74/2057—Variable input leverage

Definitions

  • the present invention relates to a lifting mechanism which is especially intended for use in a nuclear reactor facility for the purpose of lifting covers of tanks or leakti'ght vessels.
  • the present invention is directed to the design of a lifting mechanism wherein the upward travel of the cover is broken down into two stages; in the first stage, the cover is lifted vertically while remaining parallel to the plane of the opening which it obturates, and in the second stage, the cover is removed so as to free the opening.
  • the lifting mechanism comprises an articulated parallelogram formed by two parallel arms which are pivotally mounted on a base-plate so as to rotate about pivot pins which are in alignment on a vertical line, there being pivotally attached'to the ends of said arms a vertical yoke which is fixed on the cover, said base-plate being mounted to rotate freely about a driving shaft to which it attached a crank-arm, said crankarm being coupled to one of the arms of the articulated parallelogram and provided with a nose which is adapted to come into contact with a stationary abutment of said base-plate so as to drive said base-plate in rotation about the axis of said driving shaft, said nose being located at a distance away from said abutment when the cover is closed, so that the rotational movement of the driving shaft first produces the deformation of the parallelogram and consequently the vertical displacement of the cover and then, when the nose of the crank-arm is in contact with said abutment, produces the rotational motion of the combined assembly consisting of base-plate, arm, yoke and cover about
  • FIG. 1 is a partial sectional view of an installation in 3,294,255 Patented Dec. 27, 1966 which the lifting mechanism of the invention is employed;
  • FIG. 2 is another partial view of the same installation
  • FIG. 3 is a sectional view of the cover-lifting mechanism which is employed in this installation.
  • FIG. 4 is a sectional view along the line 44 of FIG. 3.
  • the lifting mechanism A in accordance with the invention is placed within the interior of a leak-tight tank or vessel 12 housed within a cell which is designed to contain a number of similar tanks and a conveyor 14 which is also leak-tight and which provides a communication between said tanks. Tlhis type of installation is employed in particular in the nuclear energy industry. As can be seen from FIG, 1, the conveyor 14 is placed beneath the tank 12 and openings 16 and 18 which are formed in the base of the tank and the conveyor shaft respectively permit the possibility of transferring objects from the conveyor into the tank or conversely.
  • the opening 16 of the tank is normally sealed off by a cover 20 and leak-tightness between the cover and the base of the tank is ensured by means of a liquefiable seal formed of a material having a melting temperature which is slightly higher than room temperature such as pitch, said seal being placed within an annular trough 22 which is formed around the opening 16 and into which extends a flange 24 of the cover 20.
  • the annular trough 22 also extends within an annular trough or channel 25 which has a larger cross-section and which surrounds the edge of the opening 18 formed in the conveyor shaft.
  • the said trough 25 is filled with liquefiable material in the same manner as the trough 22.
  • the opening 18 is normal-1y sealed by a cover 26 which rests on the annular trough 25 and which is provided with a flange extending within said trough. It is thus possible to separate the tank 12 from the conveyor 14 while nevertheless retaining leak-tightness of the tank and of the conveyor and, in addition, when the tank is in position above the conveyor, both covers 20 and 26 can be removed without impairing leak-tightness of the assembly as a whole.
  • the tank cover 20 is provided with magnetic suckers 28 which normally couple the conveyor cover 26 to the tank cover 20. Provision is made for a device which makes said suckers inoperative when it is desired to separate the tank from the conveyor.
  • Said mechanism comprises two yokes 30, one extremity of each yoke being attached to the cover 20 close to one edge of this latter.
  • Each yoke is pivotally mounted on the extremities of two arms 32 and 34 which are placed in parallel relation to each other and pivotally mounted on a base-plate 36.
  • the pivot-pins on which the yoke 30 is pivoted to the arms 32 and 34 are in alignment on a vertical line whilst the fulcrum-pins of the arms are in alignment on another vertical line and the spacing of said fulcrum-pins is equal to that of said pivot-pins, with the result that the yoke 30, the arms 32 and 34 and the base-plate 36 form an articulated parallelogram, the deformation of which produces the vertical displacement of the yoke and consequently of the cover.
  • the base plate 36 is supported on a driving shaft 38 and is freely rotatable on said shaft.
  • a crank-arm 40 is secured to the shaft 38 by means of a locking-pin 42 and is coupled to the arm 32 by means of a connecting-arm 44 which is pivotally attached to the arm 32 at a point which is distant from the fulcrum of the arm.
  • the crank-arm 40 is provided with a nose 46 which, when the cover 20 is in position, is located at a distance away from a stub shaft which is secured to the base-plate 36 as shown in FIG. 3 but is intended to come into contact with said stub shaft when the crank-arm 40 is caused to rotate.
  • the casings 50 When the cover 20 is in position, the casings 50 are supported on brackets 53 which are fixed on the frame 52 and which serve as a support for the base-plates 36 during the first stage of the lifting movement of the covers.
  • the yokes 30 traverse the bases of the casings 50 through openings which are formed for this purpose and rubber protection sleeves 54 which surround the bottom portion of each yoke 30 are clamped around annular flanges provided on the cover 20 and on the casings 50.
  • the first step consists in heating the material contained within the annular troughs 22 and 25 by means of electric heating resistors placed within said troughs, with a view to liquefying said material.
  • the second step consists in starting-up the motor which drives the shaft 38 on which the crank-arms 40 are mounted.
  • the crank-arms 40 cause the arms 32 to swing about their pivotal axes, thereby producing the deformation of the articulated parallelograms which are formed by the yokes 30, the arms 32 and 34 and the base-plates 36; the covers 20 and 26 which are coupled together by means of the magnetic suckers 28 are then lifted vertically while remaining horizontal, with the result that, during this first time-interval, the cover flanges which had been immersed in the liquefied material of the sealing joint are able to drip into the troughs 22 and 25.
  • said covers are allowed to fall back under the action of their own weight, provision being nevertheless made to brake their falling motion.
  • the base-plates 36 are brought back so as to bear on the brackets 53 and the crank-arms 40 as well as the arms 32 and 34 are returned to their initial positions.
  • Lifti g mechanism comprising an articulated parallelogram formed by two parallel arms which are pivotally mounted on a base-plate so as to rotate about pivot-pins which are in alignment on a vertical line, there being pivotally attached to the ends of said arms a vertical yoke which is fixed on the element to be lifted, said base-plate being mounted to rotate freely about a driving shaft to which is attached a crank-arm, said crank-arm being coupled to one of the arms of the articulated parallelogram and provided with a nose which is adapted to come into contact with an abutment fixed on said base-plate so as to drive said base-plate in rotation about the axis of said driving shaft, said nose being located at a distance away from said abutment when the element to be lifted is in position, with the result that the rotational movement of the driving shaft first produces the deformation of the parallelogram and consequently the vertical displacement of said element until the nose of the crankarm comes into contact with said abutment, and then produces the rotational motion of the combined assembly consisting of base-plate, arm,

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Transmission Devices (AREA)
  • Sealing Of Jars (AREA)
US399290A 1963-10-01 1964-09-25 Lifting mechanism Expired - Lifetime US3294255A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR949226A FR1380553A (fr) 1963-10-01 1963-10-01 Mécanisme de levée

Publications (1)

Publication Number Publication Date
US3294255A true US3294255A (en) 1966-12-27

Family

ID=8813460

Family Applications (1)

Application Number Title Priority Date Filing Date
US399290A Expired - Lifetime US3294255A (en) 1963-10-01 1964-09-25 Lifting mechanism

Country Status (9)

Country Link
US (1) US3294255A (en, 2012)
BE (1) BE653788A (en, 2012)
CH (1) CH421648A (en, 2012)
DE (1) DE1234962B (en, 2012)
FR (1) FR1380553A (en, 2012)
GB (1) GB1054839A (en, 2012)
LU (1) LU47010A1 (en, 2012)
NL (1) NL6411254A (en, 2012)
SE (1) SE305909B (en, 2012)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848749A (en) * 1973-11-05 1974-11-19 Owatonna Tool Co Combination crane and jack unit
JPS6044665A (ja) * 1983-08-11 1985-03-09 ウエスチングハウス　エレクトリック　コ−ポレ−ション 封止構造

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1542763A (en) * 1924-02-05 1925-06-16 Oil Well Accessories Corp Straight-line-lift pump jack
US2784764A (en) * 1955-10-11 1957-03-12 Rockwell Spring & Axle Co Adjustable seat supports
US2845299A (en) * 1954-01-20 1958-07-29 Gen Motors Corp Vehicle top compartment cover mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB758279A (en) * 1954-04-07 1956-10-03 John Wood Appleton Improvements in or relating to portable platform elevators
DE1839222U (de) * 1960-04-30 1961-10-12 Heinrich Scharf G M B H Montagehubgeraet.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1542763A (en) * 1924-02-05 1925-06-16 Oil Well Accessories Corp Straight-line-lift pump jack
US2845299A (en) * 1954-01-20 1958-07-29 Gen Motors Corp Vehicle top compartment cover mechanism
US2784764A (en) * 1955-10-11 1957-03-12 Rockwell Spring & Axle Co Adjustable seat supports

Also Published As

Publication number Publication date
BE653788A (en, 2012) 1965-01-18
NL6411254A (en, 2012) 1965-04-02
DE1234962B (de) 1967-02-23
GB1054839A (en, 2012)
CH421648A (fr) 1966-09-30
LU47010A1 (en, 2012) 1964-11-24
FR1380553A (fr) 1964-12-04
SE305909B (en, 2012) 1968-11-11

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