US3870162A - Foldable crane - Google Patents

Foldable crane Download PDF

Info

Publication number
US3870162A
US3870162A US296852A US29685272A US3870162A US 3870162 A US3870162 A US 3870162A US 296852 A US296852 A US 296852A US 29685272 A US29685272 A US 29685272A US 3870162 A US3870162 A US 3870162A
Authority
US
United States
Prior art keywords
boom
cradle
booms
hydraulic cylinder
opening
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
US296852A
Other languages
English (en)
Inventor
Toshihiro Nakajo
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.)
Furukawa Co Ltd
Original Assignee
Unic Corp
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 Unic Corp filed Critical Unic Corp
Application granted granted Critical
Publication of US3870162A publication Critical patent/US3870162A/en
Assigned to FURUKAWA COMPANY LIMITED, A CO. OF JAPAN reassignment FURUKAWA COMPANY LIMITED, A CO. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNIC CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • B66C23/54—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 with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/06—Cranes in which the lifting movement is done with a hydraulically controlled plunger
    • B66C2700/062—Cranes in which the lifting movement is done with a hydraulically controlled plunger mounted on motor vehicles
    • B66C2700/065—Cranes in which the lifting movement is done with a hydraulically controlled plunger mounted on motor vehicles with a slewable jib

Definitions

  • ABSTRACT 30 Foreign A fi fi p i D
  • a foldable crane comprising a cradle, a swivel post room 20 Japan 4636323 tatably mounted on said cradle and a plurality of booms pivotally connected to each other and adapted 1521 us.
  • booms can be rotated about each of Connecting P 215/59 between an extended aligned position and a folded position in which folded position a part of said booms is [56] References Cited housed in an opening in the cradle.
  • the opening can be made in large dimensions, if necessary, so that the UNITED STATES PATENTS change of the track position from the transporting p0 yi y ) sition to the working position or vice versa is effected 1 1 O nson 3,216,588 11/1965 Sundin eas'ly and qulckly' 3,265,219 8/1966 1 Claim, 3 Drawing Figures Sundin 212/55 X PATENTEDHARIHQYS "a 870 162 SHKU 1 0f 3 1 FOLDABLE CRANE BACKGROUND OF THE INVENTION 1.
  • This invention relates to an improvement of a foldable crane adapted for mounting on a chassis frame between a rear body and a cab of a vehicle such as a truck in folded condition.
  • a foldable crane comprises a cradle, a swivel post rot'atably supported on said cradle, a first boom pivotally connected at the base portion thereof to the top of said post, a second boom pivotally connected at the base portion thereof to the top of said first boom, and hydraulic cylinders connected between said post and said first boom and between said both booms, respectively, for elevating each of said booms from a folded position to an extended aligned position.
  • the foldable crane comprises a cradle having an opening horizontally extending therethrough, a swivel post supported rotatably on said cradle, a first boom pivotally connected at the base portion thereof to the top of the post, a hydraulic cylinder connected between said post and said first boom for elevating said first boom, a second boom pivotally connected at the base portion thereof to the top of said first boom, a hydraulic cylinder connected between said first and second booms for elevating said second boom and a third boom slidably fitted into said second boom and operatively connected to the second boom by means of a further hydraulic cylinder, said booms and said opening of the cradle are arranged such that the second and third booms are housed in said opening when the first boom is rotated downwardly after the second boom is rotated in an acute angle to the first boom.
  • It is an object of the present invention to overcome the above mentioned problems in the prior art and to provide an improved foldable crane comprising a plurality of booms pivotally connected to each other and adapted for folding compactly said booms from an extended aligned position to a folded position in which position the outer one of said booms is also positioned in the same plane with the other of the booms and housed in an opening in the cradle.
  • FIG. 1 is a front elevation of a crane constructed in accordance with the invention, shown in a folded position;
  • FIG. 2 is a front elevation similar to FIG. 1, but shown in an operating position
  • FIG. 3 is a sectional view showing a detailed construction of a part of the crane.
  • a body of the truck 1 comprises a chassis frame 2, on which a foldable crane is mounted, and conventional outriggers 3 provided at the opposite sides of the frame.
  • the foldable crane includes a cradle 4 securely mounted on the chassis frame 2 between a cab and a rear body by means of bolts (FIG. 3).
  • the cradle 4 is provided with an upstanding swivel post S'supported thereon and rotatable about the vertical axis by means of a swivelling hydraulic cylinder.
  • the crane further includes a first boom 7 pivotally connected at the base portion 7a thereof to the top of 1 the post 5 by means of a connecting pin 8 and operatively connected to the post 5 by means of an elevating hydraulic cylinder 9, a second boom 10 pivotally connected to the top of the first boom 7 and a third boom 11 slidably inserted into the second boom 10.
  • the first boom 7 is U-shaped in section so as to receive the elevating hydraulic cylinder 9 which includes a piston rod therein and extends between a pivot pin secured to the post 5 beneath the pin 8 and a pivot pin secured to the boom 7 at the intermediate of its length in such a manner that when the hydraulic cylinder is actuated to extend the piston rod, the boom 7 rotates upwardly about the pin 8 from a lower position shown in FIG. 2 to an upstanding position shown by chain line in FIG. 2.
  • the elevating hydraulic cylinder 9 which includes a piston rod therein and extends between a pivot pin secured to the post 5 beneath the pin 8 and a pivot pin secured to the boom 7 at the intermediate of its length in such a manner that when the hydraulic cylinder is actuated to extend the piston rod, the boom 7 rotates upwardly about the pin 8 from a lower position shown in FIG. 2 to an upstanding position shown by chain line in FIG. 2.
  • the second boom 10 is pivotally connected at its base portion 10a to the top 7b of the first boom 7 by means of a pin 12 and is operatively connected to the first boom 7 by means of an elevating hydraulic cylin: der 13 for elevating the second boom 10 in the same manner as the first boom 7.
  • the second boom 10 is also operatively connected to the third boom 11 by means of a third hydraulic cylinder l4v connected at the bottom end thereof and at the top end of a piston rod of the cylinder to the bottom end of the boom 10 and to the outer end of the boom 11, respectively, for causing the cylinder 14 to extend the third boom 11 from the second boom 10.
  • the cradle 4 has a rectangular opening 15 horizontally extending therethrough, said opening 15 may be provided by forming the lower portion of the cradle 4 in the form of a fork and securing the legs of the fork at the lower ends to the chassis frame 2 of the truck.
  • the dimension of the opening 15 in the cradle 4 is such that the second boom 10 and the third boom 11 can be smoothly inserted and housed in the opening 15 without interfering with the peripheral edges of the opening 15 at the ends of the booms when the first boom 7 and the second boom 10 are rotated about their pins 8 and 12 by the hydraulic cylinders 9 and 13 folded such that the second boom 10 is located at an acute angle relative to the first boom 7 after the third boom 11 has been retracted from the extended position into the second boom 10.
  • the post 5 may be provided with a forked top portion for permitting the first boom 7 to rotate relative to the post 5 in a large rotating angle and for receiving a part of the first boom 7 therein.
  • the third boom 11 may be provided with a hook 16 at the outer end thereof.
  • the third hydraulic cylinder 14 is retracted from a position shown in FIG. 1 to a position shown in FIG. 2 to prevent the third boom 11 from interfering with the edges of the opening 15 and then the hydraulic cylinder 9 of the first boom 7 is extended.
  • the truck is changed into a working position shown by a chain line in FIG. 2 from a travelling position shown in FIG. 1 in which position the crane is folded.
  • the first boom 7 When the hydraulic cylinder 9 is extended, the first boom 7 is rotated in the counterclockwise direction about the pin 8 to stand upon on the top end of the post 5 and then the second and third booms l0 and 11 which were housed in the opening 15 of the cradle 4 are also drawn out and lifted by the first boom 7.
  • the elevating hydraulic cylinder 13 for the second boom is extended to raise the second boom on the top end of the first boom and then the hydraulic cylinder 14 is actuated to extend the third boom 11 from the second boom 10.
  • the third boom 11 is retracted into the second boom 10 by means of the hydraulic cylinder 14 and then the hydraulic cylinder 13 is retracted completely to rotate the second boom 10 downwardly about the pin 12 so as to fold the second boom 10 in an acute angle relative to the first boom 7 as shown in FIG. 2.
  • the first boom 7 is rotated downwardly about 45 relative to the horizontal while the third boom 11 and the second boom 10 are inserted into the opening 15 of the cradle 4 from one end thereof and housed in the opening 15 as shown in FIG. 2.
  • each of the booms may be designed in such a manner that the first, second and third booms do not extend over the opposite sides of the truck when the ends of the booms are in their folded position.
  • the foldable crane according to the invention has various advantages such that by forming the opening for housing the booms in the cradle on which the swivel post is mounted and which is fixed to the chassis frame, the opening can be made in large dimension and in lower position than the base of the swivel post so that the change of the track position from the transporting position to the working position or vice versa is effected easily and quickly and large dimension booms can be used and then the capacity of the crane is increased while the crane can be mounted in a narrow space of minimum width between the cab and the rear body. Furthermore, since each of the booms can be extended in alignment with each other, lateral moment to which each of the booms is subjected less than the case of the booms interconnected parallelly, so that high strength is obtained in use.
  • a foldable crane comprising: a cradle having opposed side walls and a top wall connecting the upper ends of said side walls which walls define an opening extending horizontally through the length of the cradle; a swivel mechanism mounted on the top wall of said cradle; a swivel post rotatably supported by said swivel mechanism; a first boom having a U-shaped crosssection, pivotally connected at the base portion thereof to the top of the post which also has a U-shaped crosssection; a hydraulic cylinder connected between said post and first boom for elevating said first boom; a cylindrical second boom pivotally connected at the base portion thereof to the top of said first boom; a hydraulic cylinder connected between said first and second booms for elevating said second boom; a cylindrical third boom slidably fitted into said second boom, and a hydraulic cylinder for actuating the third boom extending parallel to and along the outer side of the third boom, said crane being foldable from a working position in which said booms extend generally upwardly in alignment with

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)
US296852A 1971-10-20 1972-10-12 Foldable crane Expired - Lifetime US3870162A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971096323U JPS5148144Y2 (fr) 1971-10-20 1971-10-20

Publications (1)

Publication Number Publication Date
US3870162A true US3870162A (en) 1975-03-11

Family

ID=14161789

Family Applications (1)

Application Number Title Priority Date Filing Date
US296852A Expired - Lifetime US3870162A (en) 1971-10-20 1972-10-12 Foldable crane

Country Status (5)

Country Link
US (1) US3870162A (fr)
JP (1) JPS5148144Y2 (fr)
CA (1) CA965742A (fr)
FR (1) FR2156824B1 (fr)
GB (1) GB1411274A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247035A (en) * 1977-08-11 1981-01-27 Eltzroth James L Crane conversion method
FR2492747A1 (fr) * 1980-10-23 1982-04-30 Hiab Foco Svenska Forsaljnings Appareil transbordeur de charge a bras porteur
US4623067A (en) * 1984-12-04 1986-11-18 Iowa Mold Tooling Co., Inc. Compact foldable crane
US5016768A (en) * 1989-11-02 1991-05-21 David C. Kennard, Jr. Pickup truck derrick with traveling sheaves
US5486084A (en) * 1993-06-07 1996-01-23 Raymond F. Pitman Multiple purpose material handling and working apparatus
US20100282702A1 (en) * 2009-05-07 2010-11-11 Steindl Johannes Crane

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51141152A (en) * 1975-05-22 1976-12-04 Hiab Foco Ab Crane mounted on vehicle
GB8708123D0 (en) * 1987-04-04 1987-05-13 Aerial Access Equip Vehicle mounted access lift
GB2253189A (en) * 1991-02-27 1992-09-02 Dowty Maritime Ltd A minelaying system
EP3526154A1 (fr) * 2016-10-14 2019-08-21 Palfinger AG Procédé permettant de déterminer une charge et commande pour un dispositif de levage hydraulique servant à mettre en oeuvre un tel procédé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032207A (en) * 1960-02-23 1962-05-01 Humboldt Company Loading boom with adjustable extension arm
US3154290A (en) * 1963-03-11 1964-10-27 William O Johnson Trailer-type hydraulic lift
US3216588A (en) * 1961-02-27 1965-11-09 Hydrauliska Ind Aktiebolaget Loading apparatus
US3265219A (en) * 1964-10-27 1966-08-09 Hydrauliska Ind Aktiebolaget Crane with folding boom which passes close to but clears its mast
US3554395A (en) * 1969-04-25 1971-01-12 Glenn G Dunbar Crane

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI41993B (fr) * 1963-10-10 1969-12-31 Hydrauliska Ind Ab

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032207A (en) * 1960-02-23 1962-05-01 Humboldt Company Loading boom with adjustable extension arm
US3216588A (en) * 1961-02-27 1965-11-09 Hydrauliska Ind Aktiebolaget Loading apparatus
US3154290A (en) * 1963-03-11 1964-10-27 William O Johnson Trailer-type hydraulic lift
US3265219A (en) * 1964-10-27 1966-08-09 Hydrauliska Ind Aktiebolaget Crane with folding boom which passes close to but clears its mast
US3554395A (en) * 1969-04-25 1971-01-12 Glenn G Dunbar Crane

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247035A (en) * 1977-08-11 1981-01-27 Eltzroth James L Crane conversion method
FR2492747A1 (fr) * 1980-10-23 1982-04-30 Hiab Foco Svenska Forsaljnings Appareil transbordeur de charge a bras porteur
US4623067A (en) * 1984-12-04 1986-11-18 Iowa Mold Tooling Co., Inc. Compact foldable crane
US5016768A (en) * 1989-11-02 1991-05-21 David C. Kennard, Jr. Pickup truck derrick with traveling sheaves
US5486084A (en) * 1993-06-07 1996-01-23 Raymond F. Pitman Multiple purpose material handling and working apparatus
US20100282702A1 (en) * 2009-05-07 2010-11-11 Steindl Johannes Crane
US8596474B2 (en) * 2009-05-07 2013-12-03 Epsilon Kran Gmbh Crane

Also Published As

Publication number Publication date
JPS5148144Y2 (fr) 1976-11-19
JPS4852268U (fr) 1973-07-06
GB1411274A (en) 1975-10-22
CA965742A (en) 1975-04-08
FR2156824B1 (fr) 1978-03-03
FR2156824A1 (fr) 1973-06-01
AU4778372A (en) 1973-07-12

Similar Documents

Publication Publication Date Title
US3977530A (en) Crane with gantry backhitch and boom hoist assembly removable as a unit
US3620388A (en) Collapsible pallet with pivotal end supports
US3870162A (en) Foldable crane
US3685673A (en) Side-loading self-propelled material transporting device
US4378191A (en) Cargo handling loader for pallets
JPS6119458B2 (fr)
US3732988A (en) Jib assembly for telescoping crane boom
US3578179A (en) Portable jib crane
US2506242A (en) Vehicle mounted crane with load lifting accessory
WO2013053219A1 (fr) Véhicule de transport de conteneurs et appareil de chargement automatique pour celui-ci
US3606053A (en) Grappler-spreader for cantilever-boom trucks
US3175698A (en) Hydraulic stabilizer
US3335879A (en) Side carrying lift truck
US3112836A (en) Removable cargo box for trucks or trailers
US3885677A (en) Traveling crane construction
US3484003A (en) Hydraulic loading apparatus
US2941678A (en) Device for handling cable reels and the like
US2244559A (en) Dump truck hoist
US3265219A (en) Crane with folding boom which passes close to but clears its mast
US3306467A (en) Collapsible truck mounted hoist
USRE27905E (en) Certificate of correction
US2985318A (en) Supports for mobile cranes
US3048284A (en) Stabilizer for load handling equipment
JPH08231185A (ja) 自走クレーン
CN218320411U (zh) 一种随车起重运输车辆

Legal Events

Date Code Title Description
AS Assignment

Owner name: FURUKAWA COMPANY LIMITED, 6-1, 2-CHOME, MARUNOUCHI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNIC CORPORATION;REEL/FRAME:004926/0937

Effective date: 19880616

Owner name: FURUKAWA COMPANY LIMITED, A CO. OF JAPAN,JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNIC CORPORATION;REEL/FRAME:004926/0937

Effective date: 19880616