EP0747315A1 - Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique - Google Patents

Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique Download PDF

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Publication number
EP0747315A1
EP0747315A1 EP95909954A EP95909954A EP0747315A1 EP 0747315 A1 EP0747315 A1 EP 0747315A1 EP 95909954 A EP95909954 A EP 95909954A EP 95909954 A EP95909954 A EP 95909954A EP 0747315 A1 EP0747315 A1 EP 0747315A1
Authority
EP
European Patent Office
Prior art keywords
jib
sub
boom
bracket portion
rotational bracket
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.)
Withdrawn
Application number
EP95909954A
Other languages
German (de)
English (en)
Other versions
EP0747315A4 (fr
Inventor
Seiichirou Takebe
Teruhiko Komatsu Mec Main Plant ISHIDA
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.)
Komatsu Ltd
Komatsu MEC Corp
Komatsu MEC KK
Original Assignee
Komatsu Ltd
Komatsu MEC Corp
Komatsu MEC KK
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 Komatsu Ltd, Komatsu MEC Corp, Komatsu MEC KK filed Critical Komatsu Ltd
Publication of EP0747315A1 publication Critical patent/EP0747315A1/fr
Publication of EP0747315A4 publication Critical patent/EP0747315A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/702—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic with a jib extension boom
    • 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
    • B66C13/16—Applications of indicating, registering, or weighing 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
    • B66C23/62—Constructional features or details
    • B66C23/84—Slewing gear
    • 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
    • B66C2700/0321—Travelling cranes
    • B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks

Definitions

  • the present invention relates to a method and a device for stretching and storing a sub-jib of a boom device for use in a vehicle-mounted crane.
  • an upper turret 2 including a cab 3 is mounted on a vehicle body 1.
  • a boom 4 capable of extending and contracting in multiple stages is attached to the upper turret 2 in such a manner as able to rise and lower slantly.
  • the boom 4 is positioned to lie substantially horizontally or incline slightly downward toward its front end.
  • a sub-jib 6 attached to the distal end of a top boom 5 is stored along a side of the boom 4 in parallel relation.
  • the sub-jib 6 is stretched to extend from the distal end of the top boom 5 and the work is then performed by extending or contracting and raising or lowering the boom 4 as desired.
  • a stored sub-jib is stretched by the steps of removing a storage pin, swinging the sub-jib outward, inserting a fulcrum pin, making a set pin on the extended side free, setting a boom to a predetermined angle of elevation, tilting the sub-jib to a position where it is substantially parallel to the axis of the fulcrum pin, turning the sub-jib by a sub-winding winch, and inserting a coupling pin, thereby completing the stretching operation.
  • the present invention has been accomplished with a view of solving the above-mentioned problems in the prior art, and its object is to provide a method and a device for automatically stretching and storing a sub-jib for a crane which needs fewer man-hours for preparation and less manual work and which enables a sub-jib to be stretched and stored within a short period of time in an easy, secure and safety fashion.
  • a first aspect of the method for automatically stretching and storing a sub-jib for a crane according the present invention is featured in that when the sub-jib is to be stretched, the sub-jib is oscillated in a lateral direction to be swung out to a predetermined position with the force exerted between a boom and the sub-jib, the sub-jib is thereafter locked to the distal end of the boom on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation, a rotational bracket portion is then rotated to stretch forwardly of the boom by the force acting to turn the same relative to the boom, and the sub-jib is locked to the distal end of the boom on its lateral side locating farther from the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • a second aspect of the method for automatically stretching and storing a sub-jib for a crane is featured in that when the sub-jib is to be stored, the sub-jib is separated from the distal end of a boom on its lateral side locating farther from the sub-jib when the sub-jib and the boom are in juxtaposed relation, a rotational bracket portion stretching forwardly of the boom is then rotated to a predetermined position by the force acting to turn the same relative to the boom, the sub-jib is separated from the distal end of the boom on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation, and the boom is thereafter oscillated in a lateral direction to be stored into a predetermined position with the force exerted between the boom and the sub-jib.
  • a third aspect of the method for automatically stretching and storing a sub-jib for a crane is featured in that when the sub-jib is to be stretched, the sub-jib is oscillated in a lateral direction to be swung out to a predetermined position with the force exerted between a boom and the sub-jib after raising the boom slantly by a predetermined angle, the sub-jib is locked to the distal end of the boom on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation, the sub-jib is then tilted downward, the rotational bracket portion is then rotated to stretch forwardly of the boom by the force acting to turn the same relative to the boom, and the sub-jib is locked to the distal end of the boom on its lateral side locating farther from the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • a fourth aspect of the method for automatically stretching and storing a sub-jib for a crane is featured in that when the sub-jib is to be stored, the sub-jib is tilted downward after raising a boom slantly by a predetermined angle, the sub-jib is then separated from the distal end of the boom on its lateral side locating farther from the sub-jib when the sub-jib and the boom are in juxtaposed relation, a rotational bracket portion stretching forwardly of the boom is thereafter rotated to a predetermined position by the force acting to turn the same relative to the boom, the sub-jib is then separated from the distal end of the boom on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation, and the boom is thereafter oscillated in a lateral direction to be stored into a predetermined position with the force exerted between the boom and the sub-jib.
  • a fifth aspect of the method for automatically stretching and storing a sub-jib for a crane comprising the steps of, when the sub-jib is to be stretched, (1) oscillating the sub-jib in a lateral direction to start operation of engaging a slot formed in the rear end of a rotational bracket portion, attached to a base end of the sub-jib, on one side in a transverse direction with a top boom pin fixed to the distal end of a top boom of the boom on one side in the transverse direction, after detecting means has detected that the top boom is in a certain contracted position, (2) locking the rotational bracket portion and the top boom pin by a first locking device after detecting means has detected that the slot of the rotational bracket portion is engaged with the top boom pin, (3) extending the top boom after detecting means has detected that the first locking device has completed the locking operation, (4) stretching the rotational bracket portion after detecting means has detected that the top boom has been extended to a predetermined length, and (5) locking the distal end of the top boom
  • a sixth aspect of the method for automatically stretching and storing a sub-jib for a crane comprising the steps of, when the sub-jib is to be stretched, (1) starting unlocking operation of a second locking device which locks the distal end of a top boom of a boom on the other side in a transverse direction and the rear end of a rotational bracket portion on the other side in the transverse direction by a pin, after detecting means has detected that the top beam has reached a predetermined length, (2) rotating the rotational bracket portion for storage after detecting means has detected that the second locking device has completed the unlocking operation, (3) contracting the top boom after detecting means has detected that the rotational bracket portion has been rotated to a predetermined position, (4) starting unlocking operation of a first locking device which engages a top boom pin fixed to the distal end of the top boom on one side in the transverse direction with a slot formed in the rear end of the rotational bracket portion on one side in the transverse direction into a locked state, after detecting means has detected that the top
  • the sub-jib is stretched and stored as follows.
  • the sub-jib is oscillated in a lateral direction so as to separate from the boom and the first locking device is then actuated to perform the locking operation.
  • the rotational bracket portion is rotated for stretching and the second locking device is then actuated to perform the locking operation.
  • a first aspect of the device for automatically stretching and storing a sub-jib for a crane according to the present invention is featured in comprising a laterally holding device for oscillating the sub-jib in a lateral direction, a rotational bracket portion for separating or connecting the sub-jib from or to a top boom of a boom, a first locking device and a second locking device for locking the top boom and the rotational bracket portion, and a rotating device for rotating the rotational bracket portion relative to the boom.
  • the first locking device may be a device for engaging a slot formed in the rotational bracket portion on one side in the transverse direction with a top boom pin fixed to the top boom on one side in the transverse direction into a locked state
  • the second locking device may be a device for locking a lateral side of the rotational bracket portion on the other side in the transverse direction and a lateral side of the top boom on the other side in the transverse direction by a pin.
  • the laterally holding device may comprise a lever having a slot engaging a pin fixed to the sub-jib in one position and pivotally attached to the boom in one position, a laterally holding cylinder disposed to interconnect the boom and the lever, a bracket having a slot engaging a pin fixed to the sub-jib in the other position and fixedly attached to the boom in the other position, a hook pivotally attached to the bracket and engaging the pin fixed to the sub-jib in the other position, and a rod interconnecting the lever and the hook.
  • the rotational bracket portion may have a slot formed in the rear end thereof on one side in the transverse direction for engaging a top boom pin vertically fixed to the distal end of the top boom on one side in the transverse direction, a pin hole formed in the rear end thereof on the other side in the transverse direction for engaging a vertical coupling pin fixed to the distal end of the top boom on the other side in the transverse direction, a pin hole formed in the front end thereof for mounting of the sub-jib in such a manner as able to rise and lower slantly, and a pin provided on the upper surface thereof for attachment of a rotating cylinder adapted to turn the rotational bracket portion relative to the boom.
  • the first locking device may comprise a lock link pivotally attached to the rotational bracket portion for holding the top boom pin in cooperation with the slot of the rotational bracket portion in sandwiching relation, and a first lock cylinder attached to the rotational bracket portion for operating the lock link.
  • the rotating device may comprise a first lever rotatably connected at its one end to a pin fixed to the rear end of the rotational bracket portion on the upper surface thereof, a second lever rotatably connected at its one end to the other end of the first lever and having a slot formed in its opposite end to be engageable with a rotation support pin fixed to the top boom, and a rotating cylinder disposed to interconnect the first lever and the rotational bracket portion.
  • the second locking device may comprise vertically spaced two coupling pins for coupling the top boom and the rotational bracket portion to each other, a lever pivotally attached at its central portion to the rotational bracket portion, a second lock cylinder disposed to interconnect the lever and the rotational bracket portion, and two links for respectively interconnecting both ends of the lever and the two coupling pins.
  • the device may further comprise detecting means for detecting the positions of the boom and the top boom, detecting means for detecting the position of the laterally holding device, detecting means for detecting the separation or connection the rotational bracket portion, detecting means for detecting the completion of locking or unlocking made by the first locking device and the second locking device, and detecting means for detecting the rotative position of the rotating device.
  • respective display means for displaying results detected by the detecting means may be provided in a cab equipped on the vehicle.
  • the centroid position of the subjib may lie substantially on a vertical line passing the center of an axis about which the rotational bracket portion is rotatable.
  • the device for automatically stretching and storing a sub-jib for a crane comprises the rotational bracket portion, the laterally holding device operated by a hydraulic device to oscillate the sub-jib in the lateral direction, the first and second locking devices for locking the top boom and the rotational bracket portion, and the rotating device for rotating the rotational bracket portion.
  • the detecting means e.g., limit switches
  • the display means are provided in the cab for displaying results detected by the detecting means.
  • the centroid position of the sub-jib lies substantially on a vertical line passing the center of an axis about which the rotational bracket portion is rotatable and, therefore, the rotational bracket portion can be rotated with smaller torque.
  • the sub-jib can be automatically stretched with the boom kept raised slantly at a predetermined angle, it is possible to easily and safely stretch the sub-jib on narrow roads, etc.
  • a second aspect-of the device for automatically stretching and storing a sub-jib for a crane is featured in further comprising a tilt lever for raising and lowering the sub-jib slantly, a directional control valve operated by the tilt lever, a first solenoid switching valve for switching over between a tilting circuit and a laterally holding circuit, a solenoid control valve for a laterally holding cylinder, a second solenoid switching valve for switching over between the tilting circuit and a circuit in which a first lock cylinder, a second lock cylinder and a rotating cylinder are disposed, a solenoid control valve for the first lock cylinder, a solenoid control valve for the second lock cylinder, and a solenoid control valve for the rotating cylinder.
  • a one-way valve may be disposed in one of circuits interconnecting the directional control valve and the solenoid control valve for the laterally holding cylinder, and one of circuits interconnecting the directional control valve and the solenoid control valve for the second lock cylinder.
  • the solenoid control valve for the first lock cylinder, the solenoid control valve for the rotating cylinder, the solenoid control valve for the second lock cylinder, and the second solenoid switching valve may be mounted on the rotational bracket portion.
  • the solenoid control valve for the first lock cylinder, the solenoid control valve for the rotating cylinder, the solenoid control valve for the second lock cylinder, and the second solenoid switching valve may be interconnected by a serial circuit.
  • a solenoid switching valve for switching over between the tilting circuit and the laterally holding circuit.
  • hydraulic circuits for the stretching and storing operation are connected to solenoid control valves for respective hydraulic cylinders so that the sub-jib is stretched and stored by shifting the solenoid control valves in sequence. Therefore, the operator can automatically perform the operation of stretching and storing the sub-jib by operating a changeover switch and a tilt lever in the cab. Further, since the sub-jib is stretched and stored by operating the tilt lever in one direction, safety during the operation is increased.
  • the solenoid control valves for the rotating device and the first and second locking devices are mounted on the rotational bracket portion, i.e., on the distal end side where the rotational bracket portion is turned relative to the boom, only two reels are required for hydraulic hoses and the number of hose lines to be arranged on the rotational bracket portion is reduced.
  • Fig. 1 illustrates a vehicle-mounted crane equipped with a sub-jib automatically stretching and storing device 10 of this embodiment.
  • An upper turret 2 including a cab 3 is turnably mounted on a vehicle body 1, and a multi-stage boom 4 capable of extending and contracting is attached to the upper turret 2 in such a manner as able to rise and lower slantly.
  • Fig. 1 shows the crane in a running posture. Looking the crane in a running posture from side, the boom 4 is positioned to lie substantially horizontally or incline slightly downward toward its front end.
  • the sub-jib automatically stretching and storing device 10 comprises a rotational bracket portion 30 for separating or connecting the sub-jib 6 from or to the top boom 5, a laterally holding device 20 operated by a hydraulic device (not shown) for oscillating the sub-jib in a lateral direction, a first locking device 40 and a second locking device 60 for locking the top boom 5 and the rotational bracket portion 30, and a rotating device 50 for rotating the rotational bracket portion 30 relative to the boom.
  • the sub-jib 6 attached to the distal end of the top boom 5 through the rotational bracket portion 30 is stored along a side of the boom 4 in juxtaposed relation and fixedly attached to the boom 4 by a storage pin 7 while the crane is running.
  • the sub-jib 6 is not only supported by the laterally holding device 20, but also held by a bracket 4a fixed on the boom 4.
  • the bracket 4a is preferably provided with rollers, bearings, etc. (not shown) for reducing the sliding resistance so that the sub-jib can be easily stretched.
  • stretching the sub-jib 6 it is oscillated by the laterally holding device 20 in a lateral direction (direction W in Fig. 1), i.e., swung out, as indicated by two-dot-chain lines.
  • Fig. 2 shows a condition where the sub-jib 6 is swung out as indicated by two-dot-chain lines in Fig. 1 and the top boom 5 is extended by a predetermined length to release engaged portions, described later, of the boom 4 and the sub-jib 6 from each other, allowing the sub-jib 6 to be rotated with the rotational bracket portion 30.
  • the sub-jib 6 is swung out by contracting a hydraulic cylinder 25, described later, of the laterally holding device 20.
  • a bracket 14 having a slot 15 formed therein is fixed to the boom 4 at one position (on the "upper side” as shown), and a hydraulic laterally holding cylinder 25 is attached at its bottom side to the bracket 14.
  • a lever 22 is pivotally attached at its central portion to the bracket 14 by a pin 24, and a slot 23 engaging a latch pin 21 fixed to the sub-jib 6 at one position is formed in one end of the lever 22.
  • the other end 22a of the lever 22 is attached to the rod side of the laterally holding cylinder 25.
  • the lever 22 and the boom 4 are interconnected by the laterally holding cylinder 25.
  • a bracket 16 having a slot 17 formed therein is fixed to the boom 4 at the other position (on the "lower side” as shown).
  • a hook 27 engaging a latch pin 26 is pivotally attached to the bracket 16 by a pin 16a
  • the other end 22a of the lever 22 and the hook 27 are interconnected by a rod 28.
  • the sub-jib 6 is held in place with slots 31a, 31b, described later, of the rotational bracket portion 30 engaging a top boom pin 11 of the first locking device 40 (see Fig. 5).
  • Fig. 3 When the top boom 5 is contracted by a predetermined length under the condition of Fig. 2, the sub-jib 6 is translated in the direction of arrow X, causing the pin 21 to engage the slot 23 of the lever 22 and the pin 26 to engage the slot 17 of the bracket 16, as shown in Fig. 3.
  • the resulting condition of Fig. 3 also represents a state where the sub-jib 6 is just swung out by contracting the laterally holding cylinder 25 in the direction E. In other words, this state is a storable state.
  • Figs. 5 to 7 show a condition where the sub-jib 6 is stretched forwardly of the top boom 5.
  • a top boom pin 11 and a rotation support pin 12 are fixed to the distal end of the top boom 5 on one side in a transverse direction, i.e., on its lateral side locating farther away from the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • a pair of vertically spaced pin holes 13a, 13b are formed at the distal end of the top boom 5 on the other side, i.e., on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • the rotational bracket portion 30 is provided with the first locking device 40 on one lateral surface (i.e., its lateral side locating closer to the boom end when the sub-jib and the boom are in juxtaposed relation) (Fig. 5), the rotating device 50 on an upper surface (Fig. 6), and the second locking device 60 on the other lateral surface (i.e., its lateral side locating farther away from the boom end when the sub-jib and the boom are in juxtaposed relation) (Fig. 7).
  • Figs. 8 to 10 are perspective views of the rotational bracket portion 30, the rotating device 50 and the first locking device 40, respectively.
  • the rotational bracket portion 30 has the slots 31a, 31b formed in its rear end on one side in the transverse direction for engaging the top boom pin 11 (see Fig. 6), and pin holes 32a, 32b formed in its rear end on the other side to be aligned with the pin holes 13a, 13b (see Fig. 5). Also, as shown in Fig. 6, the sub-jib 6 is attached to the distal end of the rotational bracket portion 30 by a pin 30a in such a manner as able to rise and lower slantly, and a bracket 30b is provided on the underside of the rotational bracket portion 30.
  • a tilt cylinder 8 for raising and lowering the sub-jib 6 slantly is connected to a pin 30c which is attached to the bracket 30b. Further, as shown in Fig. 8, the rotational bracket portion 30 is provided on its upper surface (Fig. 8) with a pin 34 to which a rotating cylinder 55 (Fig. 9) is connected. The rotating cylinder 55 causes the rotational bracket portion 30 to turn about the top boom pin 11 (see Fig. 6) relative to the boom 4.
  • a lock link 41 having a recess 42 engageable with the top boom pin 11 is pivotally attached by a pin 43 to a bracket 32 which is fixed to the rear end of the rotational bracket portion 30 on one lateral side.
  • a first lock cylinder 44 has a rod portion connected to the lock link 41 and a bottom portion connected to the rotational bracket portion 30.
  • the lock link 41 is coupled to the rotational bracket portion 30 by the first lock cylinder 44.
  • one end 51a of a first lever 51 is pivotally connected to a pin 33 which is fixed to the rear end of the rotational bracket portion 30 at a position near one lateral side.
  • pivotally connected to the other end 51b of the first lever 51 is one end 52a of a second lever 52.
  • a slot 53 engaging the rotation support pin 12 fixed to the top boom 5 is formed in the other end of the second lever 52.
  • a spring 54 is provided to extend between the first lever 51 and the second lever 52.
  • a slip-off preventing plate 5j is fixed to the top boom 5 so that the slot 53 of the second lever 52 is prevented from slipping off from the pin 12 except for a predetermined position during the rotation of the sub-jib.
  • the rotating cylinder 55 is disposed to interconnect the pin 34 fixed to the rotational bracket portion 30 and a central portion of the first lever 51. By extending and contracting the rotating cylinder 55, the rotational bracket portion 30 is rotated about the top boom pin 11.
  • Fig. 5 shows a condition where the rotating cylinder 55 is extended to complete the rotation of the sub-jib for stretching
  • Fig. 13 shows a condition where the rotating cylinder 55 is contracted to complete the rotation of the sub-jib for storage.
  • the slots 31a, 31b of the rotational bracket portion 30 are disengaged from the top boom pin 11 and, simultaneously, the slot 53 of the second lever 52 is disengaged from the rotation support pin 12 of the top boom 5. Also, the slot 53 is retreated in a direction to become out of interference with the slip-off preventing plate 5j.
  • FIG. 7 in which the second locking device 60 is operated to establish a locked state, the pin holes 32a, 32b of the rotational bracket portion 30 and the pin holes 13a, 13b of the top boom 5 are fixedly interconnected (locked in place) by coupling pins 61a, 61b, respectively.
  • a lever 62 is pivotally attached at its central portion by a pin 62a to the rotational bracket portion 30.
  • the lever 62 has one end 62b connected to the coupling pin 61a through a link 63a and a corner end 62c, on the other side, connected to the coupling pin 61b through a link 63b.
  • a second lock cylinder 64 is disposed to interconnect an opposite end 62d of the lever 62 on the other side and the rotational bracket portion 30.
  • the lever 62 is turned about the pin 62a at its central portion to establish the locked state, as shown in Fig. 7.
  • the coupling pins 61a, 61b are withdrawn from the pin holes 13a, 13b of the top boom 5 to come into an unlocked state, as shown in Fig. 15.
  • a lock pin 65 is provided near the corner end of the lever 62 and inserted in place to prevent the further turning of the lever 62, as shown in Fig.
  • a tilt lever provided in the cab 3
  • 71 is a directional control valve pilot-operated by the tilt lever 70
  • 72 is a hydraulic pump
  • 73, 74 are reels
  • 8 is a tilt cylinder for raising and lowering the sub-jib 6 slantly.
  • one tilting circuit 75 extending from the directional control valve 71 to the tilt cylinder 8, there are disposed a first solenoid switching valve 77, the reel 74, a second solenoid switching valve 82 and a counter balancing valve 86 successively.
  • the reel 73 there are disposed the reel 73 and a pilot-operated check valve 87 successively.
  • the first solenoid switching valve 77 supplies pressure oil from the hydraulic pump 72 to the tilting circuit or a laterally holding circuit in a switching manner.
  • the switching causes the pressure oil to flow, in the tilting circuit, into the reel 74 downstream of the valve 77 and, in the laterally holding circuit, into the laterally holding cylinder 25 through a solenoid control valve 78 which controls switchover between extension and contraction of the laterally holding circuit 25.
  • the solenoid control valve 78 and the other tilting circuit 76 are interconnected through a return circuit 80 in which a one-way valve 81 is disposed. Therefore, the oil returned from the laterally holding circuit 25 returns to a tank 88 through the return circuit 80 and the other tilting circuit 76.
  • the second solenoid switching valve 82 supplies the pressure oil from the hydraulic pump 72 to the tilting circuit or another circuit leading to the first locking device 40, the rotating device 50 and the second locking device 60 in a switching manner.
  • the switching causes the pressure oil to flow, in the tilting circuit, into the counter balancing valve 86 downstream of the valve 82 and, in another circuit, into a solenoid control valve 85 for the first lock cylinder 44 of the first locking device 40, a solenoid control valve 84 for the rotating cylinder 55 of the rotating device 50, and a solenoid control valve 83 for the second lock cylinder 64 of the second locking device 60 successively in series.
  • the solenoid control valve 83 and the other tilting circuit 76 are interconnected through a circuit 89 in which a one-way valve 81a is disposed.
  • the tilt cylinder 8 is extended and contracted to raise and lower the sub-jib 6 slantly by operating the tilt lever 70 to shift the directional control valve 71.
  • the first solenoid switching valve 77 is moved to a shift position 77b and the directional control valve 71 is moved to a shift position 71a, the pressure oil is supplied to the laterally holding circuit.
  • the laterally holding cylinder 25 is extended and contracted to store and swing out the sub-jib 6.
  • the directional control valve 71 is moved to a shift position 71c, no pressure oil is supplied to the laterally holding circuit. This means that the sub-jib 6 is swung out or stored by operating the tilt lever 70 in one direction.
  • Fig. 17 is an electric system diagram.
  • a stretching/- storage changeover switch 90 is provided in the cab 3. With the switch 90 turned to a position 90a, the operation of stretching the sub-jib is performed and, with the switch 90 turned to a position 90b, the operation of storing the sub-jib is performed.
  • 91a, 91b are respectively top boom extended and contracted position detecting limit switches for detecting the position of the top boom 5 relative to the boom 4 during the stretching operation.
  • the limit switch 91a detects that the top boom 5 has been completely extended by a predetermined amount as shown in Fig. 2 and the limit switch 91b detects that the top boom 5 has been completely contracted by a predetermined amount as shown in Fig. 3.
  • 92a, 92b are respectively top boom extended and contracted position detecting limit switches for detecting the displacements of the pins 21, 26 based on the position of the top boom 5 relative to the boom 4 during the storing operation.
  • the limit switch 92a detects that the top boom 5 has been completely extended by a predetermined amount as shown in Fig. 2 and the limit switch 92b detects that the top boom 5 has been completely contracted by a predetermined amount as shown in Fig. 3.
  • Denoted by 93a, 93b are limit switches for detecting the position of the sub-jib 6 swung by the laterally holding circuit 20.
  • the limit switch 93a detects the swung-out state shown in Fig. 4, i.e., that the top boom pin 11 and the slots 31a, 31b are disengaged from each other as shown in Figs. 14A and 14B.
  • the limit switch 93b detects the stored state shown in Fig. 3, i.e., that the top boom pin 11 and the slots 31a, 31b are engaged with each other as shown in Fig. 13.
  • 94a, 94b are limit switches for detecting the lock and unlock positions of the second locking device 60.
  • the limit switch 94a detects that the second locking device 60 has completed the locking operation as shown in Fig. 7, and the limit switch 94b detects that the second locking device 60 has completed the unlocking operation as shown in Figs. 14A and 14B.
  • Denoted by 95a, 95b are limit switches for detecting the stretching and storage rotative positions of the rotating device 50.
  • the limit switch 95a detects that the rotating device 50 has been completely rotated for stretching as shown in Fig. 5, and the limit switch 95b detects that the rotating device 50 has been completely rotated for storage as shown in Fig. 13.
  • 96a, 96b are limit switches for detecting the lock and unlock positions of the first locking device 40.
  • the limit switch 96a detects that the first locking device 40 has completed the locking operation as shown in Fig. 12, and the limit switch 96b detects that the first locking device 40 has completed the unlocking operation as shown in Fig. 11.
  • pilot lamps Denoted by 97a, 97b, 97c and 97d are pilot lamps provided as detection indicating means in the cab 3.
  • the pilot lamp 97a lights up when, during stretching of the sub-jib, the top boom 5 has been completely contracted, the laterally holding device 20 has been completely swung out the sub-jib, and the first locking device 40 has completed the locking operation.
  • the pilot lamp 97b lights up when, during stretching of the sub-jib, the top boom 5 has been completely extended, the rotational bracket portion 30 has been completely rotated for stretching, and the second locking device 60 has completed the locking operation.
  • the pilot lamp 97c lights up when, during storage of the sub-jib, the top boom 5 has been completely extended, the second locking device 60 has completed the unlocking operation, and the rotational bracket portion 30 has been completely rotated for storage.
  • the pilot lamp 97d lights up when, during storage of the sub-jib, the top boom 5 has been completely contracted, the first locking device 40 has completed the unlocking operation, and the laterally holding device 20 has completely stored the sub-jib.
  • 98 is a diode.
  • Figs. 18 and 19 show examples of mounting of the limit switches which are adapted to detect the position of the top boom 5 relative to the boom 4 and the movement of the sub-jib 6 for stretching and storage.
  • Other limit switches can also be similarly mounted in association with corresponding members to be controlled.
  • the limit switches 91a, 92a for detecting the extended position of the top boom 5 are mounted on the boom 4 to detect the position of a bracket 5m on the top boom 5, thereby detecting that the top boom 5 has been extended to a predetermined position.
  • the limit switches 91a, 92a may be mounted on the top boom 5 and the bracket 5m may be mounted on the boom 4.
  • the limit switches 91b, 92b for detecting the contracted position of the top boom 5 are mounted on the bracket 16 (shown in Fig. 2) fixed to the boom 4, thereby detecting the position of the latch pin 26.
  • the swung position detecting limit switch 93b for detecting the completion of storage of the sub-jib 6 and the swung position detecting limit switch 93a for detecting the completion of movement from the laterally held state to the swung-out state of the sub-jib 6 are mounted on the bracket 14 fixed to the boom 4, thereby detecting the moved position of the rod 28.
  • the moved position of the laterally holding device 25 may be detected. While this embodiment employs limit switches for position detecting, a cylinder with a function of position detecting, e.g., a cylinder having a position detecting sensor provided on a cylinder rod, may be used.
  • top boom 5 by a predetermined amount to the position where the top boom pin 11 and the slots 31a, 31b are engageable with each other, actuating the laterally holding cylinder 25 to swing out the sub-jib 6 for bringing the top boom pin 11 and the slots 31a, 31b into engagement, and then extending the top boom 5 again by a predetermined amount to the position where the latch pin 21 comes out of the slot 23 of the lever 22.
  • This method enables the engaging position to be indexed more precisely and hence ensures more positive engagement.
  • the top boom 5 is extended by the predetermined amount to the position where the latch pin 21 comes out of the slot 23 of the lever 22.
  • the latch pin 21 may be disengaged from the slot 23 by sliding or pivoting the lever 22 while the top boom 5 is kept in the same position.
  • the above-described method of stretching the sub-jib is summarized as follows.
  • the sub-jib 6 is laterally swung out to the predetermined position by the laterally holding cylinder 25 provided between the boom 4 and the sub-jib 6 and, after the swing-out, the first locking device 40 is actuated to lock the sub-jib 6 to the distal end of the boom 4 on its lateral side locating closer to the sub-jib when the sub-jib 6 and the boom 4 are in juxtaposed relation.
  • the rotational bracket portion 30 is stretched to extend forwardly of the boom 4 with the turning force exerted by the rotating cylinder 55 of the rotating device 50 relative to the boom 4.
  • the second locking device 60 is actuated to lock the sub-jib 6 to the distal end of the boom 4 on its lateral side locating farther away from the sub-jib when the sub-jib 6 and the boom 4 are in juxtaposed relation.
  • the above-described method of storing the sub-jib is summarized as follows. First, by removing the lock pin 65 of the second locking device 60, the sub-jib 6 is separated from the distal end of the boom 4 on its lateral side locating farther from the sub-jib when the sub-jib 6 and the boom 4 are in juxtaposed relation. Then, the rotational bracket portion 30 stretching forwardly of the boom 4 is rotated relative to the boom 4 with the turning force exerted by the rotating cylinder 55.
  • the first lock cylinder 44 is contracted to unlock and separate the sub-jib 6 from the distal end of the boom 4 on its lateral side locating closer to the sub-jib when the sub-jib 6 and the boom 4 are in juxtaposed relation.
  • the sub-jib 6 is laterally oscillated for storage into the predetermined position with the force of the laterally holding cylinder 25 provided between the boom 4 and the sub-jib 6.
  • the operation of stretching or storing the sub-jib 6 is automatically carried out by the operator simply operating the changeover switch, the boom control valve and the tilt lever while confirming a display unit in the cab. Accordingly, the sub-jib can be easily stretched or stored within a short period of time with the reduced number of steps for preparation and a less risk of interference between parts due to erroneous operations, without making the operator fatigued.
  • the rotational bracket portion 30 may be rotated while the boom 4 is raised slantly and the sub-jib 6 is tilted, as shown in Fig. 22.
  • the elevation angle ⁇ of the boom 4 is from 24° to 26°.
  • the centroid position G of the sub-jib 6 lies substantially on a vertical line Y - Y passing the center position C of the top boom pin 11 as an axis about which the rotational bracket portion 30 is rotatable. Therefore, the rotational bracket portion 30 can be rotated with smaller torque.
  • the operation of stretching the sub-jib 6 in a narrow space is performed, by way of example, as follows. After raising the boom 4 slantly by a predetermined angle, the sub-jib 6 is laterally swung out to a predetermined position by the laterally holding cylinder 25 provided between the boom 4 and the sub-jib 6. After the swing-out, the first locking device 40 is actuated to lock the sub-jib 6 to the distal end of the boom 4 on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • the tilt cylinder 8 is contracted to tilt the sub-jib 6 downward and the rotational bracket portion 30 is stretched to extend forwardly of the boom 4 with the turning force exerted by the rotating cylinder 55.
  • the second locking device 60 is actuated to lock the sub-jib 6 to the distal end of the boom 4 on its lateral side locating farther away from the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • the operation of storing the sub-jib in a narrow space is performed, by way of example, as follows. After raising the boom 4 slantly by a predetermined angle, the tilt cylinder 8 is contracted to tilt the sub-jib 6 downward. Then, by removing the lock pin 65 of the second locking device 60, the sub-jib 6 is separated from the distal end of the boom 4 on its lateral side locating farther to the sub-jib when the sub-jib and the boom are in juxtaposed relation. After the separation, the rotational bracket portion 30 stretching forwardly of the boom 4 is rotated relative to the boom 4 with the turning force exerted by the rotating cylinder 55 of the rotating device 50.
  • the tilt cylinder 8 is extended to move the sub-jib 6 back to a position parallel to the boom 4.
  • the first lock cylinder 44 of the first locking device 40 is then contracted to separate the sub-jib 6 from the distal end of the boom 4 on its lateral side locating closer to the sub-jib when the sub-jib and the boom are in juxtaposed relation.
  • the sub-jib 6 is laterally oscillated for storage into the predetermined position with the force of the laterally holding cylinder 25 provided between the boom 4 and the sub-jib 6.
  • the operation of stretching and storing a sub-jib is automatically carried out by operating a changeover switch, a boom control valve and a tilt lever. Therefore, the present invention can be advantageously practiced as a method and a device of stretching and storing a sub-jib for a crane which enables the sub-jib to be easily stretched and stored within a short period of time with a less risk of interference between parts due to erroneous operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
EP95909954A 1994-02-25 1995-02-22 Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique Withdrawn EP0747315A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP06052734A JP3090393B2 (ja) 1994-02-25 1994-02-25 クレーン用補ジブの自動張り出し、格納方法および装置
JP52734/94 1994-02-25
PCT/JP1995/000252 WO1995023111A1 (fr) 1994-02-25 1995-02-22 Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique

Publications (2)

Publication Number Publication Date
EP0747315A1 true EP0747315A1 (fr) 1996-12-11
EP0747315A4 EP0747315A4 (fr) 1997-06-04

Family

ID=12923167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95909954A Withdrawn EP0747315A4 (fr) 1994-02-25 1995-02-22 Procede et dispositif de deploiement et de rangement automatique du bras articule d'une fleche de grue telescopique

Country Status (6)

Country Link
EP (1) EP0747315A4 (fr)
JP (1) JP3090393B2 (fr)
KR (1) KR970701150A (fr)
CN (1) CN1143353A (fr)
TW (1) TW345195U (fr)
WO (1) WO1995023111A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0928770A1 (fr) * 1998-01-09 1999-07-14 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. Procédé et appareil pour déplier et replier une flèche complémentaire

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3652437B2 (ja) * 1996-05-09 2005-05-25 株式会社加藤製作所 自走式クレーンのブームヘッド格納機構
CN102701087B (zh) * 2012-06-12 2014-05-21 北京市三一重机有限公司 一种臂架及工程机械
JP6962425B2 (ja) * 2015-11-20 2021-11-05 株式会社タダノ アダプタ
JP2017095221A (ja) * 2015-11-20 2017-06-01 株式会社タダノ アダプタ
DE102016009038B4 (de) * 2016-07-25 2018-02-08 Liebherr-Werk Ehingen Gmbh Klappspitzen-Anlenkstück und Verfahren zum Montieren einer Klappspitze

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467722A1 (fr) * 1990-05-03 1992-01-22 Ppm Societe Anonyme: Flèche de manutention comprenant une flèche principale et une flèche complémentaire

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS538119Y2 (fr) * 1972-12-20 1978-03-02
JPS5431489Y2 (fr) * 1974-08-09 1979-10-02
JPS562715Y2 (fr) * 1976-04-13 1981-01-21
JPS55106991A (en) * 1979-02-05 1980-08-16 Shin Meiwa Ind Co Ltd Structure of connected portion of folded boom
JPS58144590U (ja) * 1982-03-25 1983-09-29 日本車輌製造株式会社 クレ−ンの荷重演算装置の表示盤
JPS62103595U (fr) * 1985-12-19 1987-07-01
JPS6327396A (ja) * 1986-07-21 1988-02-05 株式会社タダノ 伸縮ブ−ムに継ぎ足されるジブ
JP2552159Y2 (ja) * 1992-05-29 1997-10-27 株式会社タダノ ジブ付クレーンのジブ回動装置
JPH06239582A (ja) * 1993-02-18 1994-08-30 Kobe Steel Ltd ホイール式クレーン
JP2583846Y2 (ja) * 1993-04-02 1998-10-27 住友建機株式会社 クレ−ンにおけるジブの振出・格納装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467722A1 (fr) * 1990-05-03 1992-01-22 Ppm Societe Anonyme: Flèche de manutention comprenant une flèche principale et une flèche complémentaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9523111A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0928770A1 (fr) * 1998-01-09 1999-07-14 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. Procédé et appareil pour déplier et replier une flèche complémentaire

Also Published As

Publication number Publication date
KR970701150A (ko) 1997-03-17
JP3090393B2 (ja) 2000-09-18
CN1143353A (zh) 1997-02-19
WO1995023111A1 (fr) 1995-08-31
EP0747315A4 (fr) 1997-06-04
TW345195U (en) 1998-11-11
JPH07237888A (ja) 1995-09-12

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