US3028018A - Collapsible boom for mobile cranes - Google Patents

Collapsible boom for mobile cranes Download PDF

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US3028018A
US3028018A US811996A US81199659A US3028018A US 3028018 A US3028018 A US 3028018A US 811996 A US811996 A US 811996A US 81199659 A US81199659 A US 81199659A US 3028018 A US3028018 A US 3028018A
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boom
jib
main
cable
outer end
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US811996A
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Alfred H Mott
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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
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating 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
    • B66C2700/0321—Travelling cranes
    • B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks
    • B66C2700/0364—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks with a slewing arm
    • B66C2700/0371—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks with a slewing arm on a turntable

Definitions

  • the present invention generally relates to a boom construction and more particularly to a foldable and collapsible boom mounted on a mobile vehicle.
  • the primary object of the present invention is to provide a crane having a main boom and a jib pivotally attached to the outer end thereof in which the jib boom is foldable to a position alongside the main boom with the main boom including upper and lower half booms pivotally interconnecting, which may be maintained in rigid aligned relation or folded to side by side condition.
  • the present invention overcomes the problems of an elongated boom and jib in over the road transportation. It is extremely difiicult to maneuver an elongated boom when the carrying vehicle is driven on the road, and this boom also presents a danger to other motorists since the boom extends quite a distance in front of or rearwardly of the vehicle. If the boom is disassembled for transportation, quite a number of hours are required to disassemble the boom and then re-assemble it at the job location. Therefore, the present invention not only saves time and labor but also provides a safer manner of moving a crane. With the present invention, the boom can be easily folded to collapsed condition or extended in a minimum time while requiring only one operator although it is preferable to have one man in the control cab while another man is on the ground to handle certain portions of the structure.
  • a further object of the present invention is to provide a foldable boom and jib which are relatively simple in construction, easy to fold and unfold, safe in operation, long lasting, dependable, and relatively inexpensive to manufacture and maintain.
  • FIGURE 1 is a side elevational view of the crane illustrating the main boom and jib boom in operative position;
  • FIGURE 2 is a partial side elevational view illustrating the first step in the folding procedure
  • FIGURE 3 is a view similar to FIGURE 2 and illustrating the second step in the folding procedure
  • FIGURE 4 is a view similar to FIGURE 2 and illustrating the third step in the folding procedure
  • FIGURE 5 is a view similar to FIGURE 2 and illustrating the final step in the folding procedure
  • FIGURE 6 is a side elevational view of the crane with the main boom and jib boom in folded or collapsed condition;
  • FIGURE 7 is a fragmentary perspective view illustrating the connection between the halves of the main boom.
  • FIGURE 8 is a fragmentary perspective view of the jib boom and its connection to the upper end of the main boom.
  • the numeral 10 generally designates the crane including a mobile vehicle 12, a main boom 14 and a jib boom 16 attached to main boom 14.
  • the vehicle 1-2 includes the usual cab 18 housing the power mechanism and controls therefor.
  • the cab 18 is rotatable about a vertical axis and is self propelled by virtue of the power driven crawler treads 20, all of which may vary and the details of this structure form no particular part of the present invention.
  • the main boom 14 is hingedly supported from the frame 22 of the cab 18 for vertical swinging movement by hinge pin 24.
  • the main boom is also constructed of an upper half boom 26 and a lower half boom 28, each of which includes corner rails 30 rigidly interconnected by braces 32 which form a skeletonized boom which tapers from the center of the boom towards a narrower and shallower configuration at the remote ends thereof.
  • the lower pair of rails 30 have brackets 34 on their adjacent ends which are hingedly interconnected by pivot shaft 36 which extends between the lower rails 30 and carries a supporting prop or leg 38 which is swingable from a position lying alongside of the boom to a position depending therefrom.
  • the upper pair of corner rails 30 have brackets 40 which overlap and are provided with removable lock bolts 42,.
  • the lock bolts 42 are not necessary to the operation of the device and are employed as an added safety precaution.
  • Each half boom 26 and 28 is provided with a roller 44 journaled between the upper pair of rails 30 for forming cable engaging rollers under certain conditions as set forth hereinafter.
  • gussets 46 journaling a shaft 47 carrying pulleys 48 and 50 thereon with the gussets 46 also having upstanding brackets 52 rigidly afiixed thereto for pivotally supporting the jib boom 16.
  • the jib boom 16 includes corner rails 54 interconnected by braces 56 with the inner ends of rails converging and rigidly secured together by gussets 58.
  • the outer ends also converge and are interconnected by gussets 60.
  • the inner gussets 58 are interconnected by a transverse shaft 62 which also extends through the upper ends of brackets 52 in spaced relation to the pulleys 48' and 50.
  • Pivotally attached to the gussets 58 by hinge pin 63 are two upwardly extending support posts 64 and 66 rigidly interconnected by a crossed brace member 68. Extending between the posts 64 and 66 is a shaft 70 having a cable pulley or sheave 72 mounted thereon. Also, the upper ends of the posts 64 and 66 are provided with cable seats for receiving brace cables 74 having one end thereof connected to the upper frame rails 54 adjacent the outer end thereof and having the other end connected to the upper rails 30 of the upper half boom 16 adjacent the inner end thereof for forming the tension member of the truss formed when the boom and jib boom are in operative position.
  • the outer gussets 60 are interconnected by a shaft 76 receiving a cable pulley 78fithereon.
  • a cable 80 passes over pulley 78 and extends downwardly and terminates in a load carrying hook 82. Cable 80 also passes over pulley 72 and extends rearwardly into the cab for attachment to a suitable winch mechanism for raising and lowering a load carried by hook 82.
  • a boom cable 84 extends over pulley 48 which also has a hook 86 on the free end thereof. Pulley 50 is not employed unless the jib boom is not used, then jib cable 80 is entrained over pulley 50. The main boom is raised and lowered by the boom support cables 33.
  • the hooks 82 and 86 are fastened to the jib boom 16 and lower half boom 28 respectively and the boom is lowered until the depending leg 3-8 strikes the ground.
  • the upper half boom 26 may continue to lower until the jib boom and the outer end of the upper half boom are resting on the ground as shown in FIGURE 3.
  • the lower half boom 28 is raised while the upper half boom 26 and the jib 16 stay on the ground as shown in FIGURE 4.
  • the support posts 64 and 66 fold down due to their own weight.
  • the lower half boom 28 is raised further and the upper half boom 26 is pulled towards the cab 18 as shown in FIGURE 5 and the jib starts to fold back against the upper half boom 26.
  • FIGURE 6 shows the final folded position of the boom and the boom is unfolded by following a reverse sequence of steps.
  • the overlapping brackets 40 and the hinged brackets 34 abut each other in such a manner that pivotal movement in only one direction is permitted and as long as lifting force is exerted on the outer end of the boom, the half booms will be maintained in rigid alignment.
  • a boom assembly for cranes comprising an elongated main boom, a jib boom pivotally mounted on the outer end of said boom, truss means interconnecting the main boom and jib boom comprising collapsible upwardly extending support posts at the inner end of said jib boom and brace cables extending over the tops of said support posts and connected between the outer end of said jib boom and the mid portion of said main boom to support said jib boom in extended position from the outer end of said main boom, whereby the jib boom may be folded over upwardly to a position alongside the main boom, said main boom including an upper half boom and a lower half boom pivotally interconnected inwardly of said mid portion for swinging movement of the upper.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Description

April 3, 1962 A. H. MOTT 3,028,018
COLLAPSIBLE BOOM FOR MOBILE CRANES Filed May 8, 1959 2 Sheets-Sheet 1 INVENTOR AHMA i2 M ATT NEY April 3, 1962 A. H. MOTT 3,028,018
LLAPSIBLE BOOM FOR MOBILE CRANES Filed May 8, 1959 2 Sheets-Sheet 2 A NEY United States Patent Ofitice 3,028,1il8 Patented Apr. 3, 1962 3,028,018 COLLAPSIBLE BOOM FOR MOBILE CRANES Alfred H. Mott, 73 Paisley Ave. S., Hamilton, Ontario, Canada Filed May 8, 1959, Ser. No. 811,996 1 Claim. (Cl. 212-59) The present invention generally relates to a boom construction and more particularly to a foldable and collapsible boom mounted on a mobile vehicle.
The primary object of the present invention is to provide a crane having a main boom and a jib pivotally attached to the outer end thereof in which the jib boom is foldable to a position alongside the main boom with the main boom including upper and lower half booms pivotally interconnecting, which may be maintained in rigid aligned relation or folded to side by side condition.
The present invention overcomes the problems of an elongated boom and jib in over the road transportation. It is extremely difiicult to maneuver an elongated boom when the carrying vehicle is driven on the road, and this boom also presents a danger to other motorists since the boom extends quite a distance in front of or rearwardly of the vehicle. If the boom is disassembled for transportation, quite a number of hours are required to disassemble the boom and then re-assemble it at the job location. Therefore, the present invention not only saves time and labor but also provides a safer manner of moving a crane. With the present invention, the boom can be easily folded to collapsed condition or extended in a minimum time while requiring only one operator although it is preferable to have one man in the control cab while another man is on the ground to handle certain portions of the structure.
A further object of the present invention is to provide a foldable boom and jib which are relatively simple in construction, easy to fold and unfold, safe in operation, long lasting, dependable, and relatively inexpensive to manufacture and maintain.
Still other objects and advantages will appear from the following description of an exemplifying embodiment of this invention, from the appended claim and from the accompanying drawings:
FIGURE 1 is a side elevational view of the crane illustrating the main boom and jib boom in operative position;
FIGURE 2 is a partial side elevational view illustrating the first step in the folding procedure;
FIGURE 3 is a view similar to FIGURE 2 and illustrating the second step in the folding procedure;
FIGURE 4 is a view similar to FIGURE 2 and illustrating the third step in the folding procedure;
FIGURE 5 is a view similar to FIGURE 2 and illustrating the final step in the folding procedure;
FIGURE 6 is a side elevational view of the crane with the main boom and jib boom in folded or collapsed condition;
FIGURE 7 is a fragmentary perspective view illustrating the connection between the halves of the main boom; and
FIGURE 8 is a fragmentary perspective view of the jib boom and its connection to the upper end of the main boom.
Referring now specifically to the drawings, the numeral 10 generally designates the crane including a mobile vehicle 12, a main boom 14 and a jib boom 16 attached to main boom 14.
The vehicle 1-2 includes the usual cab 18 housing the power mechanism and controls therefor. The cab 18 is rotatable about a vertical axis and is self propelled by virtue of the power driven crawler treads 20, all of which may vary and the details of this structure form no particular part of the present invention.
The main boom 14 is hingedly supported from the frame 22 of the cab 18 for vertical swinging movement by hinge pin 24. The main boom is also constructed of an upper half boom 26 and a lower half boom 28, each of which includes corner rails 30 rigidly interconnected by braces 32 which form a skeletonized boom which tapers from the center of the boom towards a narrower and shallower configuration at the remote ends thereof.
The lower pair of rails 30 have brackets 34 on their adjacent ends which are hingedly interconnected by pivot shaft 36 which extends between the lower rails 30 and carries a supporting prop or leg 38 which is swingable from a position lying alongside of the boom to a position depending therefrom.
The upper pair of corner rails 30 have brackets 40 which overlap and are provided with removable lock bolts 42,. The lock bolts 42 are not necessary to the operation of the device and are employed as an added safety precaution. Each half boom 26 and 28 is provided with a roller 44 journaled between the upper pair of rails 30 for forming cable engaging rollers under certain conditions as set forth hereinafter.
At the outer end of the upper half boom 26, there are provided gussets 46 journaling a shaft 47 carrying pulleys 48 and 50 thereon with the gussets 46 also having upstanding brackets 52 rigidly afiixed thereto for pivotally supporting the jib boom 16.
The jib boom 16 includes corner rails 54 interconnected by braces 56 with the inner ends of rails converging and rigidly secured together by gussets 58. The outer ends also converge and are interconnected by gussets 60. The inner gussets 58 are interconnected by a transverse shaft 62 which also extends through the upper ends of brackets 52 in spaced relation to the pulleys 48' and 50.
Pivotally attached to the gussets 58 by hinge pin 63 are two upwardly extending support posts 64 and 66 rigidly interconnected by a crossed brace member 68. Extending between the posts 64 and 66 is a shaft 70 having a cable pulley or sheave 72 mounted thereon. Also, the upper ends of the posts 64 and 66 are provided with cable seats for receiving brace cables 74 having one end thereof connected to the upper frame rails 54 adjacent the outer end thereof and having the other end connected to the upper rails 30 of the upper half boom 16 adjacent the inner end thereof for forming the tension member of the truss formed when the boom and jib boom are in operative position.
The outer gussets 60 are interconnected by a shaft 76 receiving a cable pulley 78fithereon. A cable 80 passes over pulley 78 and extends downwardly and terminates in a load carrying hook 82. Cable 80 also passes over pulley 72 and extends rearwardly into the cab for attachment to a suitable winch mechanism for raising and lowering a load carried by hook 82. When the main boom and jib are folded, the cable 80 will ride on the rollers 44 to prevent damage to the cable. A boom cable 84 extends over pulley 48 which also has a hook 86 on the free end thereof. Pulley 50 is not employed unless the jib boom is not used, then jib cable 80 is entrained over pulley 50. The main boom is raised and lowered by the boom support cables 33.
In order to fold the boom, the hooks 82 and 86 are fastened to the jib boom 16 and lower half boom 28 respectively and the boom is lowered until the depending leg 3-8 strikes the ground. Assuming that no lock bolts interconnect brackets 40, the upper half boom 26 may continue to lower until the jib boom and the outer end of the upper half boom are resting on the ground as shown in FIGURE 3. Then the lower half boom 28 is raised while the upper half boom 26 and the jib 16 stay on the ground as shown in FIGURE 4. The support posts 64 and 66 fold down due to their own weight. The lower half boom 28 is raised further and the upper half boom 26 is pulled towards the cab 18 as shown in FIGURE 5 and the jib starts to fold back against the upper half boom 26. FIGURE 6 shows the final folded position of the boom and the boom is unfolded by following a reverse sequence of steps. When the upper and lower half booms are in alignment, the overlapping brackets 40 and the hinged brackets 34 abut each other in such a manner that pivotal movement in only one direction is permitted and as long as lifting force is exerted on the outer end of the boom, the half booms will be maintained in rigid alignment.
It is understood that this invention is not confined to the particular embodiment shown and described, the same being merely illustrative, and that this invention may be carried out in other ways within the scope of the appended claim without departing from the spirit of this invention, as it is obvious that the particular embodiment shown and described is only one of the many that may be employed to attain the objects of this invention.
I claim:
A boom assembly for cranes comprising an elongated main boom, a jib boom pivotally mounted on the outer end of said boom, truss means interconnecting the main boom and jib boom comprising collapsible upwardly extending support posts at the inner end of said jib boom and brace cables extending over the tops of said support posts and connected between the outer end of said jib boom and the mid portion of said main boom to support said jib boom in extended position from the outer end of said main boom, whereby the jib boom may be folded over upwardly to a position alongside the main boom, said main boom including an upper half boom and a lower half boom pivotally interconnected inwardly of said mid portion for swinging movement of the upper.
half boom in a downward direction in relation to the lower half boom, and stop means at said interconnection for preventing upward swinging movement of the upper half boom above a position in alignment with the lower half boom, thereby maintaining the half booms in align- .4 ment when the main boom is supported from the outer end of the upper half boom, a pivotal prop mounted at the pivotal connection between the half booms for swinging movement from a depending operative position to an inoperative position alongside one of the half booms, said prop adapted to support the connection between the half booms in elevated position above a supporting surface, thereby enabling the jib boom and the outer end of the upper half boom to rest on such a supporting surface whereby the outer end of the lower half boom may be elevated for swinging the upper half boom to a downwardly extending position alongside the undersurface of the lower half boom, said main boom and jib boom being of skeletonized construction and include longitudinal corner rails interconnected by-braccs, said corner rails converging at the ends thereof and being interconnected by gusset plates, a cable pulley mouted on the outer end of the jib boom and on the outer end of the main boom, a jib boom load cable entrained over the pulley on the jib boom, a load cable entrained over the pulley on the main boom, hook means on the outer end of each cable adapted for attachment to a load and for attachment to a portion of the boom assembly for holding the assembly in folded condition, said lower half boom and the upper half boom each having a transverse roller journalled thereon adjacent the point of pivotal connection therebetween for engaging the load cables when the half booms are moved to a folded position.
References Cited in the file of this patent UNITED STATES PATENTS 885,803 Terry Apr. 28, 1908 1,920,370 Forsythe Aug. 1, 1933 2,073,539 Shelton Mar. 9, 1937 2,772,790 Kauffman Dec. 4, 1956 FOREIGN PATENTS 519,605 Italy Mar. 15, 1955 737,302 Great Britain a Sept. 21, 1955 849,605 Germany Sept. 15, 1952 1,036,452 1 France Apr. 22, 1953
US811996A 1959-05-08 1959-05-08 Collapsible boom for mobile cranes Expired - Lifetime US3028018A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152569A (en) * 1961-08-23 1964-10-13 H W Gehlen K G Eisenwerke Kais Amphibious vehicle
US3325018A (en) * 1965-10-22 1967-06-13 Pacific Coast Eng Co Articulating crane
US3516554A (en) * 1968-03-21 1970-06-23 Kyoei Kaihatsu Co Ltd Two-stage extensible boom
JPS5128750Y1 (en) * 1973-02-26 1976-07-20
US4068770A (en) * 1976-05-27 1978-01-17 Mcdonnell Douglas Corporation Foldable inclined multi-section ramp actuation system
JPS5730791B1 (en) * 1976-07-27 1982-06-30
US4491229A (en) * 1981-02-25 1985-01-01 Fmc Corporation Boom extension stowage system
US6186346B1 (en) * 1998-03-20 2001-02-13 Grove U.S. L.L.C. Multi-position low profile boom nose
US20040124167A1 (en) * 2002-12-06 2004-07-01 Liebherr-Werk Ehingen Gmbh Mobile crane with elongated boom
US20060065616A1 (en) * 2003-04-02 2006-03-30 Stefan Diehl Method for erecting an at least two-piece main boom for a lattice-boom crane and lattice-boom crane built accordingly
JP2009107843A (en) * 2007-10-29 2009-05-21 Liebherr Werk Ehingen Gmbh Raising method of crane boom
JP2009107842A (en) * 2007-10-29 2009-05-21 Liebherr Werk Ehingen Gmbh Erecting method of crane boom
US20130327775A1 (en) * 2011-06-01 2013-12-12 Jonathan Diaz Trash Receptacle Securing System

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US885803A (en) * 1907-12-24 1908-04-28 Edward F Terry Collapsible wrecking derrick and car.
US1920370A (en) * 1931-11-14 1933-08-01 Charles E Forsythe Extension boom for cranes
US2073539A (en) * 1936-04-16 1937-03-09 Marion Steam Shovel Co Excavating machine
DE849605C (en) * 1949-08-19 1952-09-15 Hans Liebherr Tower crane
FR1036452A (en) * 1951-05-04 1953-09-08 Chantiers Et Ateliers De Const Crane
GB737302A (en) * 1952-09-01 1955-09-21 Rheinmetall Ag Mobile slewing crane with collapsible jib
US2772790A (en) * 1955-05-09 1956-12-04 Roy D Kauffman Variable length boom extension

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US885803A (en) * 1907-12-24 1908-04-28 Edward F Terry Collapsible wrecking derrick and car.
US1920370A (en) * 1931-11-14 1933-08-01 Charles E Forsythe Extension boom for cranes
US2073539A (en) * 1936-04-16 1937-03-09 Marion Steam Shovel Co Excavating machine
DE849605C (en) * 1949-08-19 1952-09-15 Hans Liebherr Tower crane
FR1036452A (en) * 1951-05-04 1953-09-08 Chantiers Et Ateliers De Const Crane
GB737302A (en) * 1952-09-01 1955-09-21 Rheinmetall Ag Mobile slewing crane with collapsible jib
US2772790A (en) * 1955-05-09 1956-12-04 Roy D Kauffman Variable length boom extension

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152569A (en) * 1961-08-23 1964-10-13 H W Gehlen K G Eisenwerke Kais Amphibious vehicle
US3325018A (en) * 1965-10-22 1967-06-13 Pacific Coast Eng Co Articulating crane
US3516554A (en) * 1968-03-21 1970-06-23 Kyoei Kaihatsu Co Ltd Two-stage extensible boom
JPS5128750Y1 (en) * 1973-02-26 1976-07-20
US4068770A (en) * 1976-05-27 1978-01-17 Mcdonnell Douglas Corporation Foldable inclined multi-section ramp actuation system
JPS5730791B1 (en) * 1976-07-27 1982-06-30
US4491229A (en) * 1981-02-25 1985-01-01 Fmc Corporation Boom extension stowage system
US6186346B1 (en) * 1998-03-20 2001-02-13 Grove U.S. L.L.C. Multi-position low profile boom nose
US20040124167A1 (en) * 2002-12-06 2004-07-01 Liebherr-Werk Ehingen Gmbh Mobile crane with elongated boom
US7219810B2 (en) * 2002-12-06 2007-05-22 Liebherr-Werk Ehingen Gmbh Mobile crane with elongated boom
US20060065616A1 (en) * 2003-04-02 2006-03-30 Stefan Diehl Method for erecting an at least two-piece main boom for a lattice-boom crane and lattice-boom crane built accordingly
US7270243B2 (en) * 2003-04-02 2007-09-18 Terex-Demag Gmbh & Co. Kg Method for erecting an at least two-piece main boom for a lattice-boom crane and lattice-boom crane built accordingly
JP2009107843A (en) * 2007-10-29 2009-05-21 Liebherr Werk Ehingen Gmbh Raising method of crane boom
JP2009107842A (en) * 2007-10-29 2009-05-21 Liebherr Werk Ehingen Gmbh Erecting method of crane boom
US20090134108A1 (en) * 2007-10-29 2009-05-28 Hans-Dieter Willim Method of raising a crane boom
US9725285B2 (en) * 2007-10-29 2017-08-08 Liebherr-Werk Ehingen Gmbh Method of raising a crane boom
US20130327775A1 (en) * 2011-06-01 2013-12-12 Jonathan Diaz Trash Receptacle Securing System
US9181027B2 (en) * 2011-06-01 2015-11-10 Jonathan Diaz Trash receptacle securing system

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