US3917074A - Control device for hoisting machines - Google Patents

Control device for hoisting machines Download PDF

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Publication number
US3917074A
US3917074A US426043A US42604373A US3917074A US 3917074 A US3917074 A US 3917074A US 426043 A US426043 A US 426043A US 42604373 A US42604373 A US 42604373A US 3917074 A US3917074 A US 3917074A
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United States
Prior art keywords
crane
arm
shaft
jib
swinging
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US426043A
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English (en)
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Jean Havard
Henri Charonnat
Francois Cova
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Individual
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Individual
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Priority claimed from FR7246115A external-priority patent/FR2210565B1/fr
Priority claimed from FR7328601A external-priority patent/FR2239410B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/22—Control systems or devices for electric drives
    • B66C13/30—Circuits for braking, traversing, or slewing motors
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/082—Control of the secondary movements, e.g. travelling, slewing, luffing of the jib, changing of the range

Definitions

  • the device comprises a first Jul 31 1973 France 73'286o1 movable arm connected to the ]lb of the first crane so y as to reproduce the movements in swinging and steeve [52] U S Cl 47. 214/1 RCM of the first cran'e, a second movable arm connected to [51] Ilit. Cl.
  • FIGJG US. Patent Nov. 4, 1975 Sheet 2 of7 3,917,074
  • the present invention relates to the synchronization of the movement of two cranes mounted in opposed relation on each side of a handling area, as the hold of a ship.
  • Each of these hoisting means has a jib which is movable about its post, mounted at a fixed station, in two directions of freedom apart from the hoisting of the suspension hook:
  • the device for synchronizing the movements of the present invention is in particular adapted to maintain a swing-bar (or the load) suspended from two crane hooks in a direction which is constantly parallel to a given axis (for example the axis of a ship) irrespective of the displacement of the package or load above the handling area.
  • the two points of suspension always have the same height (swing-bar constantly horizontal) owing to the action of a known device synchronizing the hoistings with which device the present invention is not concerned.
  • the path of the packages is uniform for defined positions of the supports of the machines.
  • the control device avoids the aforementioned drawbacks.
  • the crane posts remain at a fixed station, notwithstanding a notable increase in the area served under imposed conditions, that is to say, the maintenance of the swing-bar parallel to itself with the suspension hooks vertical.
  • the path of the load may be varied without complicating the operations carried out by a single unskilled crane operator. Slow approach speeds can be obtained as desired by the operator.
  • the maximum speeds of each of the cranes are automatically guaranteed by a safety device.
  • the system determining the angles of steeve and swinging of the jibs is the same. It takes up a small amount of space, is compact and located within a frame sheltered from the surroundings. It is designed with mechanical parts which require no maintenance. It allows each crane to very easily resume its independence. Consequently, it allows very many advantageous coupling combinations between different cranes located at the end of, or between, successive handling areas.
  • the invention provides a device controlling the movement of the jibs of a first crane and at least a second crane mounted in opposed relation on fixed stands,
  • said device comprising a first movable arm coupled to the jib of the first crane so as to reproduce the movements of swinging and steeving of the first crane, a second movable arm coupled to the jib of the second crane, termed the follower crane, and operatively connected to the first arm so as to move in a way corresponding to the position that the jib of the second crane must occupy as a function of the position of the jib of the first crane which is given by the first arm.
  • FIG. 1 is a diagrammatic elevational view of the two cranes
  • FIG. 2 is adiagrammatic plan view of the two cranes
  • FIG. 3 is a diagrammatic elevational view of one of the cranes with its device for effecting a horizontal displacement of the load irrespective of the steeve;
  • FIG. 4 is a vertical sectional assembly view of the mechanical syste'm controlling the pilot arm and follower arm which are oriented approximately in the same plane;
  • FIG. 5 is adiagrammatic elevational view of the follower arm and pilot arm
  • FIG. 5a is a diagrammatic plan view of the follower arm and pilot arm
  • FIG. 6 is a sectional view, taken on line AA of FIG. 4, of a detail of a plate carrying the columns;
  • FIG. 7 is a detail view of a device effecting the swinging and steeving of the pilot arm
  • FIG. 8 is a horizontal sectional view, taken on line CC of FIG. 4, of the follower and pilot arms;
  • FIG. 9 is a horizontal sectional view, taken on line DD of FIG. 4; of the control of the steeving of the pilot arm and the control of the steeving of the follower crane by the follower arm;
  • FIG. 10 is a -diag'rammatic plan view of the handling area
  • FIG. 11 is a diagram of the control of the cranes through the steeving of the pilot and follower arms;
  • FIG. 12 is a-plan view of another embodiment of the mechanical device according to the invention for determining the orientations
  • FIG. 13 is a diagrammatic plan view of the arms
  • FIG. 14 is aplan view of the same device with the arms inclined
  • FIG. 15 is an elevational view of the same device.
  • FIG. 16 is a sectional view taken on line AA of FIG. 15.
  • FIG. 1 shows diagrammatically two cranes G1 and G2 at a fixed station.
  • the first crane is termed a pilot crane and it is only this crane which is operated by the crane operator.
  • the second crane which is termed a follower crane, is operated automatically by the device according to the invention.
  • the two hoisting machines are located on each side of, for example, the hold 4 of a ship.
  • the pilot crane G1 pivots about a vertical axis xx of its post. Its jib is raised and lowered about a point 5 located approximately on the axis x-x.
  • the same is true of the follower crane G2.
  • the two jibs are in opposed relation. Their swingings a1 and a2 (FIG.
  • the straight line 7-8 is embodied either by a swing-bar 13 or by any load, either one being suspended at two points 14 and 15.
  • Another flange 31 is disposed between the flange 27 and the ring 25 and it is slidably mounted on a shaft 32 but drives the latter through a sliding key 33. It may be connected to the ring 25 or to the flange 27 by the action of an electromagnet 34. The contacting surfaces are provided with friction washers so that it is possible, as desired, to drive the flange 31 with the pivoting post 21 (through the ring 25) or hold it stationary (through the flange '27).
  • This assembly therefore constitutes a remote controlled clutch of the shaft 32.
  • the frame 18 rotates with respect to the shaft 35, which becomes stationary, the shaft 35 extending through the bottom 20 of this frame through a sealed rolling bearing 36.
  • the coaxial shafts 35 and 32 are interconnected by two cranks 37 and 38 and a column 39.
  • the shaft 35 is fixed rigidly in its upper part to a member 40 which is, in this case, stationary with respect to the frame 18.
  • FIG. 7 is a sec tional view of this detail to an enlarged scale.
  • the member 40 carries a horizontal shaft 41 to which is fixed an arm 42, termed the pilot arm of the mechanical control device.
  • the movement of the stand with respect to the pilot arm 42 represents, in the opposite direction, the variable swinging of the jib with respect to the ground.
  • the steeving movement of the pilot arm 42 is achieved by means of a sleeve 43 provided at each end with a circular rack 44, the sleeve being slidable on the shaft 35 under the effect of a pinion 45 which is meshed.
  • FIG. 7 shows that the pinions 45 and 48 rotate in synchronism and cause the pilot arm 42 to descend or rise in a manner identical to that of the pilot jib.
  • the drive for the shaft 46 is shown in FIG. 9.
  • An extension 46a of the shaft is freely mounted in a plate 49 integral with the frame.
  • a flange 50 slidably keyed on the extension 46a affords either a drive through the flange 51 (rotating in accordance with the steeving of the crane) or a locking on the plate 49.
  • each alternative operation is rendered possible by an electromagnet 52 constituting the control of the clutch.
  • the arrangement is similar to that previously described for the orientation movement take off.
  • the linkage (diagrammatically shown at 53) which interconnects the flange 51 and the 1 pilot jib is mounted in such manner that the rotation of the shaft 46 will be exactly the same and in the same direction as that of the pivot of the jib on the post of the pilot crane.
  • the sleeve of the arm 42 will therefore be equal to that of the pilot jib.
  • the pilot arm 42 terminates in a pivotal connection 54 to a slide 55 which moves freely without play on one of two vertical guides 56 and 57.
  • the slide has a depending portion in which is formed the bore for the pivot pin of the arm.
  • the dimensionj (FIGS. 4 and 8) is determined in the manner indicated hereinafter.
  • the sleeve slides on the cylindrical guide through balls.
  • the two vertical guides are mounted in a plate 58 constituting a carriage which moves in the manner of a small travelling crane.
  • the plate 58 is slidable in a beam 59 which moves parallel to itself in the two slideways 60 mounted on the opposed faces of the frame 18.
  • FIG. 6 shows a crosssectional view of this system for shifting the carriage 58 on which are fixed two additional reinforcements 57aand 57b.
  • the plate 58 therefore moves horizontally in any direction while maintaining the axes of the cylindrical guides 56 and 57 vertical in a plane constantly parallel to itself.
  • the pilot arm 42 imposes by its relative steeve and swinging (with respect to the frame) a well-defined position on the plate 58 through the slide 55. The latter is at any height on its guide 56.
  • the other guide 57 is also provided with another slide 61 similar to the slide 56 and pivoted at 62 to a second moving arm 63 termed the follower arm.
  • the latter therefore follows the movements of the pilot arm with different arm 63 is transmitted to the shaft 67 through the same device as that of the previously described pilot arm (pinions and circular rack slidable on the vertical shaft 68).
  • the rotation of the shaft 67 controls the raising or lowering of the follower crane jib until the imposed steeve angle B2 is reached.
  • the movement is transmitted through the shaft 69 connected to a potentiometer 70 (FIG. 9).
  • the latter constitutes one of the parts of the motorized control of the steeving of the follower crane.
  • the shaft 68 (FIG.
  • the crane jibs have respective swingings which are inverted with respect to those of the arms 42 and 63.
  • the inversion exists by symmetry with respect to the line PS (FIG. 5a). Itis very easy to embody and reestablish in the controlsystem.
  • the swingings of the arms are counted in relative value with respect to the bottom 20 of the frame.
  • FIG. 11 shows by way of example a diagram comprising, in the centre part, a diagrammatic representation of the pilot arm 42 and its drive by the crane parts through clutches 34 and 52.
  • the follower arm 63 is on the left side, the pilot arm being on the right side.
  • the pilot arm has two detecting potentiometers (steeve 74,, swinging 75).
  • the follower .arm furnishes, through its steeve potentiometer 70 and its swinging 63 have r'especpotentiometer 71, the data which will be compared at 76 and 77 with those which come from the potentiometers 78 and79 connected to-the corresponding servomechanisms.
  • a motorization controlled by an information of the speed of displacement of the jib in swinging and steeving.
  • 82 and 83 there'may be included a ramp (or cam) giving progressive movements.
  • the hoisting of the hooks is also synchronized by means of the same hoisting lever 91 or the like through ramps and thyristor drive devices 92 and 93. Further, at 94, a corrector of the horizontality of the movement of the load acts when the steeve angle is high (jib approaching the vertical).
  • the device may be replaced by levers of proportional length.
  • the unit which has just been described is simple and may be operated by an unskilled crane operator.
  • the handling area is easily covered and maintenance is reduced.
  • the ratio length of the projection/length of the jib always gives the value of cos B and therefore B2;
  • the value of [3, gives constantly the length of the horizontal projection of the jib. Consequently, the two corresponding units of calculation are very small. They are currently available from industry. In other words, a large part of the complex systems for mathematical solutions is replaced by a simple mechanical device while maintaining two elementary units of calculation which avoid the kinematic complications of an entirely mechanical solution.
  • FIGS. 12, 14, and 16 The fixed parts of this mechanism are constituted by two rings 101 and 102 shown in FIGS. 15 and 16 and interconnected by a strut 103 which determines the value of their centre distance E.
  • This assembly is completed by legs 104 which are sufficiently spaced apart and reinforced by connecting members 105 so that the support thus formed is stable and rigid.
  • This support carries two tables 106 and 107 which are braced at 108 and on which a motor 109 with its gear wheel 110 is secured.
  • the rotation of the shaft of the motor and consequently the shaft 111 of the device is so controlled that it exactly reproduces (modifled by the gear ratios) the angular movements of the swinging shaft of the pilot crane.
  • the shaft 111 of the device is electrically synchronized in a precise manner with the swinging shaft M1 of the pilot crane G1 (FIG. 1). Between the latter (M1) and the motor 109 there are disposed all the necessary electrical means including power amplifiers.
  • the angular deviations of the shaft of the motor 109 and the swinging shaft of the pilot crane G1 are constantly compared by means of the indications of the two rotary potentiometers (109a for the motor 109).
  • the electrical circuit is sufficiently conventional and need not be shown in the drawing.
  • Each of the rings 101 and 102 carries two bearings in which is journalled the vertical shaft 111 in respect of the first ring, and a shaft 112 in respect of the second ring.
  • the ring 111 carries in its lower part a gear wheel 113 which is driven by the gear wheel 110 of the motor 109. Consequently, if the gear ratio between the gears 110 and 113 is correctly chosen, the vertical shaft 111 rotates about its axis ab in the same way as that which controls the swinging of the pilot crane about the axis x-x'.
  • Fixed to the upper part of the shaft 111 and locked in position is a horizontal movable table 114 which rotates with this shaft.
  • a ball bearing slide which comprises a fixed part 115 screwthreadedly engaged with the table 114 and a movable rule 116.
  • the latter carries a rack 117 with which engages a pinion 118 mounted on the shaft 119 of a motor 120.
  • the latter is secured by a support 121 to the table 114 which is movable about the axis ab.
  • a rotary potentiometer 122 driven by the shaft 119, is secured to another support 123 integral with the table 114.
  • the potentiometer 122 operates in the manner described hereinafter.
  • the assembly just described is therefore pivotable with the table 114 about the vertical axis ab. It follows the movements of swinging of the pilot crane G1.
  • K1 and k1 (FIGS. 12 and 14) remain constantly proportional; Kl n.kl.
  • the horizontal table 124 carries a slide (part 125 screwed to the table and movable rule 126).
  • the rack 127 secured to the rule 126 engages the gear pinion 128 which it drives.
  • Mounted on the shaft 129 of the pinion 128 is a rotary potentiometer 130 (shown in dot-dash line in FIG. 16) fixed to the table 124 by a support 124a.
  • This potentiometer which also acts as a bearing for the shaft 129, furnishes to the motor R2 for steeving the follower crane (through a device described hereinafter) the information concerning the displacement of the rack 127 and therefore of the rule 126.
  • the latter is drigen by the other rule 116 through a vertical pivot pin 131 having an axis 00 and extending through two overlapping end portions of the rules 116 and 126.
  • FIG. 14 shows how the rules move in the same horizontal plane, the rule 116 shifting the other rule 126.
  • the table 124 which supports the rule 126 must rotate freely about the axis cd in order to follow the rotation a, of the rule 116 about the axis ab. Its rotation on: is recorded by the rotary potentiometer 132 driven by the vertical shaft 1 12. A gear wheel 133 on the shaft of the potentiometer 132 meshed with a gear wheel 134 ensures this drive.
  • the potentiometer is fixed on the strut 103 by the columns 135 and a plate 136. It transmits the information concerning the value of oz; of swinging which the follower crane G2 must have and controls the motor M2 of the latter about its axis y y.
  • variable distance a0 (dimensionkl) is proportional to K1 LI cos [3, (horizontal projection of the jib L1 of the pilot crane).
  • Kl n.kl (n conim) the distance as (dimension k2) is proportional to K2 (horizontal projection of the jib L2 of the follower crane).
  • K2 L2 cos ⁇ 3 L2 constant
  • cos [3 (n/L2).k2 (n/L2 constant). Knowing the dimension k2 from the poten-* tiometer 130 determining the displacement of the rule 126 with its rack 127, it is easy to calculate the value of cos. B and therefore the value of [3,.
  • This resolver is not shown in the drawings as it is of conventional construction. Its information controls, through an amplifier, the motor R2 for steeving the follower crane through an electric circuit which is also conventional;
  • the length of the jibs of the cranes may be different
  • the follower crand jib is consequently perfectly controlled, for steeving and swinging, by the movements of the pilot crane.
  • the potentiometer 122 may be chosen with a ratio 3 in order to increase the fineness of the information.
  • potentiometer effects three revolutions.
  • the rotation of the other potentiometers may also be muliplied.
  • one or more systems for taking up play may be employed in the drives through gear pinions and gear wheels.
  • the support 136 of the gear pinion 133 connected to the potentiometer 132 is pivoted to the column 135.
  • a spring 137 biases the gear pinion 133 on the ring gear 134 and suppresses the play between the gear teeth.
  • a cam 138 (FIG. 16) which actuates two electric switches 139 and 140 provided with rollers. These contacts limit the extreme positions of the pivotable table 114 driven by the motor 109.
  • the table 114 carries laterally the two supports 141 and 142 of two microcontacts 143 and 144 whose action on abutments 145 and 146 mounted at the ends of the sliding rule 1 16 limits the travel of the latter.
  • One of the microcontacts causes the slowing down and the other causes the stoppage.
  • the other sliding rule 126 which carries abutments 147 and 148 acting on contacts 149 and 150.
  • the microcontact 151 in cooperation with the abutment 152 (fixed to the rule 126) stops the sliding in the other direction. Any other safety device may be mounted for limiting the movements.
  • the cross-hatched region in FIG. 14 shows the area which may be covered by the pivot pin 131.
  • the fixed strut 103 may be constituted by two sliding parts so as to be adaptable to different centre distances between the cranes. It must be understood that the invention is not intended to be limited to the embodiments of each one of the parts of the device as the invention embraces all possible modifications within the scope of the following claims.
  • a device for controlling the movements of a jib of a first crane termed a pilot crane, and a jib of at least a second crane mounted in opposed relation on fixed stands on opposite sides of a handling area, said device comprising a first movable arm connected to the jib of the first crane so as to give an indication relative to the movements in swinging and steeve of the first crane, a second movable arm connected to the jib of the second crane, termed follower crane, and means for operatively connecting the second arm to the first arm in such manner that the second arm effects movements corresponding to the position that the jib of the second crane must occupy in accordance with the position of the first crane given by the first arm whereby the load being hanld d by said cranes always remains parallel to a predetermined orientation irrespective of the orientation and steeve given to said pilot crane.
  • a device as claimed in claim 1, comprising a post for each crane, a frame integral with the post of the first crane, the first arm being able to be swung and raised in the frame, the second arm also being able to be swung and raised in the frame, said connecting means between the first arm and second arm comprising two vertical guides which are parallel and mounted at a constant distance from each other, two pivotal slides respectively slidably mounted on the guides, the first arm and second arm having free end portions respectively pivoted to the slides.
  • a device as claimed in claim 2 comprising two vertical opposed walls of the frame, two slideways fixed to the two opposed walls, a beam slidable on the slideway, and a carriage slidable on the beam and carrying the vertical guides.
  • each of the pivotal slides comprises a horizontal pivot pin which is at a distance from the axis of the corresponding vertical guide which is equal to the distance between the vertical axis of swinging of the first arm and a horizontal shaft carrying the first arm.
  • A'device as claimed in claim 1 wherein the post of the first crane is mounted to rotate on the corresponding fixed stand about an axis and the axis of swinging of the first arm is aligned with the axis of rotation of the post on its stand.
  • a device as claimed in claim 1, comprising an electromagnetic brake for limiting the swinging of the first arm with respect to the frame by rendering the first arm stationary with respect to the stand of the first crane.
  • a device as claimed in claim 6, comprising a first shaft which extends into the frame and is operatively connected to an element of the electromagnetic brake, a member fixed to the end of the first shaft, and a horizontal shaft rotatably mounted in the member, the first arm being fixed to the horizontal shaft.
  • a device as claimed in claim 6, further comprising a shaft for swinging the first arm, a clutch associated with the electromagnetic brake and adapted to render the shaft swinging the first arm integral with the frame so as to render the first arm stationary with respect to the frame.
  • a device .as claimed in claim 9, further comprising means for-de-clutching and immobilizing the means for steeving the first arm, said de-clutching and immobilizing means being arranged outside said frame.
  • a device as claimed in claim 1, comprising a first servomechanism for steeving the jib of the second crane, a second servomechanism for orienting the jib of the second crane, a horizontal shaft for controlling the first servomechanism, a vertical shaft for controlling the second servomechanism, the second arm being mounted in the frame in the same way as the first arm, the steeving of the second arm being transmitted to the horizontal shaft, and the swinging of the second arm being transmitted to the vertical shaft.
  • first and second servomechanisms comprise means for automatically limiting the speed of displacement of the jib of the first crane as soon as the speed of displacement of the jib of the second crane reaches a maximum limit value.
  • a device for controlling the movements of a jib of a first crane and a jib of at least a second crane mounted in opposed relation on fixed stands on opposite sides of a handling area so that a load suspended from the two cranes maintains a constant predetermined orientation within said handling area irrespective of the orientation and steeve given to the first crane termed the pilot crane
  • said device comprising a first movable arm connected to the jib of the first crane so as to reproduce the movements in swinging and steeve of the first crane, a second movable arm connected to the jib of the second crane, termed follower crane, and means for operatively connecting the second arm to the first arm in such manner that the second arm effects movements corresponding to the position that the jib of the second crane must occupy in accordance with the position of the first crane given by the first arm, the first and second movable arms being constituted by a first rule and a second rule, there being provided a first table and a second table which are horizontal and mounted
  • a device as claimed in claim 13, comprising a controlled electric motor having an output shaft for reproducing angular swinging movements of the first crane, the first table having a shaft which defines the axis of rotation of the first table and is connected to said output shaft through a set of gears.
  • a device as claimed in claim 14, comprising means for synchronizing said output shaft with a motor having an output shaft for swinging the first crane.
  • a device as claimed in claim 15, wherein said synchronizing means comprise two rotary potentiometers, each potentiometer being connected to the corresponding output shaft.
  • a device as claimed in claim 13, comprising a rotary potentiometer, an electric motor having an output shaft for driving the potentiometer, a gear pinion mounted on the output shaft, a rack provided on the first rule and meshed with the gear pinion, an electric motor for steeving the jib of the first crane and electrically connected to the last-mentioned motor.
  • a device as claimed in claim 17, comprising a resolver for rendering the rotation of the motor driving the first rack associated with the first rule directly proportional to the cosine of the steeve angle of the jib of the first crane, the resolver ensuring the conversion of the value of the steeve angle into its cosine value which is converted into a voltage which is permanently compared with the voltage of the potentiometer connected to the motor driving the first rack, the rotation of the motor connected to the first rack varying the values of the horizontal projections of the jib of the first and second cranes embodied by the distances between the pivot pin and the axes of rotation of the first and second tables.
  • a device as claimed in claim 18, wherein the second rule which is slidably mounted on the second table operatively connected to the mechanism for displacing the jib of the second crane comprises a second rack, there being provided a rotary potentiometer for furnishing information relating to the displacement of the second rack to a motor for steeving the second crane, and a gear pinion for transmitting the movement of the second rack to the last-mentioned potentiometer.
  • a device as claimed in claim 13, comprising a shaft for rotating with the second table, a set of gears, a rotary potentiometer having an actuating shaft which is connected to the shaft for rotating the second table, a motor for controlling the swinging of the second crane and electrically connected to the last-mentioned potentiometer.
  • a device as claimed in claim 13, comprising adjacent a free end of each rule two end-of-travel abutmerits, and microcontacts co-operative with the two abutments for limiting the travel of the corresponding rule, one of the microcontacts being for causing the slowing down and the other the stoppage of the corresponding rule.
  • a device as claimed in claim 13, comprising a shaft for rotating with the first table, a cam mounted on the shaft, two switches having rollers'for limiting the rotation of the first table at two extreme positions and being co-operative with the cam.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US426043A 1972-12-19 1973-12-19 Control device for hoisting machines Expired - Lifetime US3917074A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7246115A FR2210565B1 (no) 1972-12-19 1972-12-19
FR7328601A FR2239410B1 (no) 1973-07-31 1973-07-31

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US3917074A true US3917074A (en) 1975-11-04

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US426043A Expired - Lifetime US3917074A (en) 1972-12-19 1973-12-19 Control device for hoisting machines

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US (1) US3917074A (no)
JP (1) JPS5744598B2 (no)
DE (1) DE2363261C3 (no)
ES (1) ES421588A1 (no)
GB (1) GB1420490A (no)
NO (1) NO141087C (no)
SE (1) SE394651B (no)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
AT406149B (de) * 1994-12-22 2000-02-25 Elin Energieversorgung Vorrichtung zum verladen
US6695157B1 (en) * 2001-05-15 2004-02-24 Liebherr-Werk Nenzing Gmbh Rotary crane
CN102001587A (zh) * 2010-11-17 2011-04-06 武汉船用机械有限责任公司 一种船用回转起重机吊臂搁置的自动控制方法及控制装置

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Publication number Priority date Publication date Assignee Title
JPS5139847A (ja) * 1974-10-01 1976-04-03 Mitsubishi Electric Corp Kureenbuumunoshototsuboshikanshihohoto sonosochi
JPS5361844A (en) * 1976-11-12 1978-06-02 Nishishiba Denki Kk Connection controller for two deck cranes
JPS59164284U (ja) * 1983-04-18 1984-11-02 日本コロムビア株式会社 電子部品取付具
JPS60159795A (ja) * 1984-01-31 1985-08-21 松下電器産業株式会社 電子楽器の鍵盤装置
JPS635682U (no) * 1986-06-27 1988-01-14
JPH02132539U (no) * 1989-04-10 1990-11-02

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354182A (en) * 1943-06-08 1944-07-25 Gibbs & Cox Inc Cargo handling device
US3489293A (en) * 1966-02-02 1970-01-13 Asea Ab Means for controlling the luffing and swinging of a load arm

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2354182A (en) * 1943-06-08 1944-07-25 Gibbs & Cox Inc Cargo handling device
US3489293A (en) * 1966-02-02 1970-01-13 Asea Ab Means for controlling the luffing and swinging of a load arm

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406149B (de) * 1994-12-22 2000-02-25 Elin Energieversorgung Vorrichtung zum verladen
US6695157B1 (en) * 2001-05-15 2004-02-24 Liebherr-Werk Nenzing Gmbh Rotary crane
CN102001587A (zh) * 2010-11-17 2011-04-06 武汉船用机械有限责任公司 一种船用回转起重机吊臂搁置的自动控制方法及控制装置

Also Published As

Publication number Publication date
DE2363261A1 (de) 1974-07-04
SE394651B (sv) 1977-07-04
NO141087B (no) 1979-10-01
DE2363261B2 (de) 1977-08-11
ES421588A1 (es) 1976-07-16
NO141087C (no) 1980-01-09
DE2363261C3 (de) 1978-03-30
JPS5744598B2 (no) 1982-09-22
JPS4996448A (no) 1974-09-12
GB1420490A (en) 1976-01-07

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