CA1138824A - Movable ring supported lift crane - Google Patents
Movable ring supported lift craneInfo
- Publication number
- CA1138824A CA1138824A CA000354096A CA354096A CA1138824A CA 1138824 A CA1138824 A CA 1138824A CA 000354096 A CA000354096 A CA 000354096A CA 354096 A CA354096 A CA 354096A CA 1138824 A CA1138824 A CA 1138824A
- Authority
- CA
- Canada
- Prior art keywords
- ring
- pair
- boom
- crawler assemblies
- crane
- 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
Links
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A front and rear pair of crawler assemblies are provided for supporting the ring of a ring supported crane so the crane can travel under load. The front pair of crawler assemblies which form an independent transporter mechanism are selectively and reversely powered to facilitate forward and reverse as well as turning movement. The rear pair of crawler assemblies are disposed in idling arrangement.
A front and rear pair of crawler assemblies are provided for supporting the ring of a ring supported crane so the crane can travel under load. The front pair of crawler assemblies which form an independent transporter mechanism are selectively and reversely powered to facilitate forward and reverse as well as turning movement. The rear pair of crawler assemblies are disposed in idling arrangement.
Description
This invention relates generally to lift cranes and more particulaîly concerns a mobile ring supported crane.
In response to ever-increasing user needs, self-propelled cranes have been made capable oE lifting ever greater loads.
While a number oE fac-tors enter into determining crane capacity, a basic limitation arises from the fac-t that, inevitably, the weight of the crane and its load must be transferred to the earth in some stable fashion and, if rotation of the load is desired, the crane-earth connection must be made stable through the arc of crane rotation.
A significant increase in crane capacity was achieved by providing a self-propelled crane with~the support ring and extended boom carrier disclosed and claimed in U.S. patent Nos.
3,485,383 and 3,878,94~. In this design, the weight oE the crane and its load is transerred to the c~round through a large diameter, track~ e ring. As shown in these patents, and as practiced commercially for some years, the support ring is either blocked into place by timbers fitted and wedged beneath and completely around the ring or is supported by a plurality of jacks spaced around the periphery of the ring.
Further refinements in ring supported cranes are disclosed in U.S. patent Nos. 4,042,115 and 4,103,783. These patents disclose inter alia that a separate transporter mechanism may be run in and out of an otherwise stationary ring supported crane in order to move that crane between different locations or job sites.
The primary aim of the present invention is to provide a crane assembly having an upper structure pivoted on a lower car body with a pair of support beams secured to and forming a part of the lower car body and a track-like ring secured to the beams and horizontally surrounding the lower car body, the beams extending fore and aft beneath and beyond the periphery of the ring, a boom carrier pivoted for ~ertical movement on the upper structure and riding for rotation on the ring, a boom mounted on the boom carrier Eor lifting a load, a counterweigh-t carrier pivoted for vertical movement on the upper structure and riding for rotation on the ring, means interconnecting the counterweight carrier and the boom for coun-teracting a heavy load, and a traveling support for the ring and crane assembly including front and rear pairs of laterally spaced crawler assemblies respectively attached outboard of the projecting ends of the pair of beams and means including respective frame elements interconnecting the cxawler assemblies of each oE the front and rear pairs and for supporting the ring between the ends of the support beams, the pair of front crawler assemblies each including an endless track and hydraulic motor means for selectively and reversibly driving the tracks to permit movement of the crane and ring over the ground while the boom is lifting a heavy load.
Other objects and advantages oE the :invention will become apparent upon reading the following de-tailed description and upon reference to the drawings, in which:
Figure 1 is a fragmentary elevation of a crane support structure embodying the present invention; and Figs. 2 and 3 are sections taken approximately along the lines 2-2 in Fig. 1 and 3-3 in Fig. 2, respectively.
Turning to the drawings, there is shown a crane 10 having an upper structure 11 mounted for rotation on a car body 12 through a roller path 13. In order to increase the capacity of the crane 10, a track-like ring 15 is secured to the ends of support beams 16 and 17 so as to horizontally surround the car body 12. Preferably, the ring has an I-beam cross section with a hardened upper path sur~ace. To adapt the crane for this ring support configuration, the support beams 16, 17 are secured to the car body 12 so that the beams become part of the car body.
The geometry of the crane 10 contributes to its high ca-pacities when used with the ring support. A boom carrier 25 is pivoted for vertical movement on the upper structure 11 and provided with a roller assembly 26 for rota-tion on the ring 15.
. boom 27 is mounted on the carrier at what becomes the load lifting fulcrum 2~ of the system, and a load lift line 29 runs along and over -the end of the boom 27. A counte.rweight carrier 31 is also pivoted for vertical movement a-t 32 on the upper structure 11 and the carrier ~tends the opposite direction from the boom carrier 25 to ride on -the ring 15 through roller assem-blies 33, only one of which is shown. ~ounterweights 34 are stacked on the carrier 31.
In efEec~, all structure to -the non-boom side of the ~ulcrum 28 is available for counterbalancing and stabilizing the crane 10. Preferably, a mast 36 is mounted on the carrier 25 and boom lift rigging 37 interconnects the tops of the mast 36 and the boom 27 ~or moving the boom vertically. The mast 36 ls secured by pendants 38 to gantry structure 3~ on the upper structure 11 to fo.rm a substantially rigid assembly, and other pendant~; 41 provide substantially rigid connections between the counterweight carrier 31 and the top of the mast 36. Str~ts 42 establish the substantially fixed angular position -to the mast 36. This geometry creates a stable~ high capacity crane.
A traveling support arrangement 45 is provided for support-ing the ring 15 under the fulcrum 28 to permit movemen-t of the crane 10 and ring 15 over the ground while the boom 27 is lifting a heavy load. In the preferred embodiment the traveling support 45 includes a pair of laterally spaced crawler assemblies 46 and 47 respectively located adjacent the forward ends of the support beams 16 and 17. The crawler assemblies 46, 47 are connected together by a frame element or car body 4~ which, in turn, is pivotally interconnected to a frame element 51 on which the ring 15 is supported. Preferably, the frame element 51 is connected to the car body 48 through a turntable 52 and to -the ring 15 through a plurality of shear plates 53 and lugs.
When a heavy load is lifted by the boom 27, the ~orces are transmitted do~n through the boom 27 and mast 36 to -the boom ~3~
arrier 25 riding on the riny 15 adjacent the fulcrum 28. The liEting forces are also transmitted through pendants ~1 to the counterweights 3~ stackecl on the carrier tending to lift the carrier 31 off the ring 15. Since the attachment ~rame element 51 supports the ring 15 adjacent the Eulcrum 28, the lifting forces pass primarily down through the ring 15 to the transport assembly and are resisted by the crawler assemblies 46, 47 engaging the ground.
Each of the crawler assemblies 45, 46 is independently powered to move the crane 10 under load by selectively and reversibly powering the crawlers 45, 46 such as by independent fixed and variable displacement hydraulic motors 65 and 66, respectively, such as shown in U.S. patent No. 4,000,78~l, whlch in incorporated herein by reference. Operation of these motors 65, 66 not only increases the traction power oE -the crane 10, since the load is primarily supported on the crawlers ~5, ~6, but also, insures more positive steering control when the crane is moved in a curved path.
The rear portion of the ring 15 is provided with support means 67 to support the ring during -travel and to resist rearward tipping of the crane 10 and ring 15 when a heavy load is not being supported by the boom 27. This avoids the necessity of removing portions o~ the coun-terweight 34 from the carrier between successive heavy lift operations. Preferably, the support means 67 includes a pair of laterally spaced crawler assemblies 68 and 69 respectively located adjacent the rear ends of the support beams ~6 and 17. The crawler assemblies are connected toge-ther by a cross frame 70 on which the rear portion of the ring is supported.
It should also be appreciated that the traveling support arrangement 45 and support means 67 may be quickly and conveniently attached and detached from a standard ring supported crane such as disclosed in U.S. patent No. 4,1~3~783 which is ncorporated herein by reference. As shown in that pa-tent, a plurality of ring support arms 71 are pivoted for vertical movement on the car body 12 and extend outwardly -to underlie the ring 15 at spaced points around the ring periphery. A plurality of jacks 72 are positioned one at the end of each of the arms 71 with the jacks 72 being sized so as to engage the ground when extended and lift the ring 15 and the car body 12 from the ground.
To Eacilitate setting up the ring lS~ hydraulic jacks 73 are mounted at the four ends of the support beams 16, 17.
Manipulation of these jacks 73 allows the ring 15 to be lifted and leveled, whereupon the manual jacks 72 can be quickly ex-tended to provide firm support for the ring completely around its periphery and to Eacilitate coupling and uncoupling the traveling support arrangement 45 and/or -the support means 67~
In response to ever-increasing user needs, self-propelled cranes have been made capable oE lifting ever greater loads.
While a number oE fac-tors enter into determining crane capacity, a basic limitation arises from the fac-t that, inevitably, the weight of the crane and its load must be transferred to the earth in some stable fashion and, if rotation of the load is desired, the crane-earth connection must be made stable through the arc of crane rotation.
A significant increase in crane capacity was achieved by providing a self-propelled crane with~the support ring and extended boom carrier disclosed and claimed in U.S. patent Nos.
3,485,383 and 3,878,94~. In this design, the weight oE the crane and its load is transerred to the c~round through a large diameter, track~ e ring. As shown in these patents, and as practiced commercially for some years, the support ring is either blocked into place by timbers fitted and wedged beneath and completely around the ring or is supported by a plurality of jacks spaced around the periphery of the ring.
Further refinements in ring supported cranes are disclosed in U.S. patent Nos. 4,042,115 and 4,103,783. These patents disclose inter alia that a separate transporter mechanism may be run in and out of an otherwise stationary ring supported crane in order to move that crane between different locations or job sites.
The primary aim of the present invention is to provide a crane assembly having an upper structure pivoted on a lower car body with a pair of support beams secured to and forming a part of the lower car body and a track-like ring secured to the beams and horizontally surrounding the lower car body, the beams extending fore and aft beneath and beyond the periphery of the ring, a boom carrier pivoted for ~ertical movement on the upper structure and riding for rotation on the ring, a boom mounted on the boom carrier Eor lifting a load, a counterweigh-t carrier pivoted for vertical movement on the upper structure and riding for rotation on the ring, means interconnecting the counterweight carrier and the boom for coun-teracting a heavy load, and a traveling support for the ring and crane assembly including front and rear pairs of laterally spaced crawler assemblies respectively attached outboard of the projecting ends of the pair of beams and means including respective frame elements interconnecting the cxawler assemblies of each oE the front and rear pairs and for supporting the ring between the ends of the support beams, the pair of front crawler assemblies each including an endless track and hydraulic motor means for selectively and reversibly driving the tracks to permit movement of the crane and ring over the ground while the boom is lifting a heavy load.
Other objects and advantages oE the :invention will become apparent upon reading the following de-tailed description and upon reference to the drawings, in which:
Figure 1 is a fragmentary elevation of a crane support structure embodying the present invention; and Figs. 2 and 3 are sections taken approximately along the lines 2-2 in Fig. 1 and 3-3 in Fig. 2, respectively.
Turning to the drawings, there is shown a crane 10 having an upper structure 11 mounted for rotation on a car body 12 through a roller path 13. In order to increase the capacity of the crane 10, a track-like ring 15 is secured to the ends of support beams 16 and 17 so as to horizontally surround the car body 12. Preferably, the ring has an I-beam cross section with a hardened upper path sur~ace. To adapt the crane for this ring support configuration, the support beams 16, 17 are secured to the car body 12 so that the beams become part of the car body.
The geometry of the crane 10 contributes to its high ca-pacities when used with the ring support. A boom carrier 25 is pivoted for vertical movement on the upper structure 11 and provided with a roller assembly 26 for rota-tion on the ring 15.
. boom 27 is mounted on the carrier at what becomes the load lifting fulcrum 2~ of the system, and a load lift line 29 runs along and over -the end of the boom 27. A counte.rweight carrier 31 is also pivoted for vertical movement a-t 32 on the upper structure 11 and the carrier ~tends the opposite direction from the boom carrier 25 to ride on -the ring 15 through roller assem-blies 33, only one of which is shown. ~ounterweights 34 are stacked on the carrier 31.
In efEec~, all structure to -the non-boom side of the ~ulcrum 28 is available for counterbalancing and stabilizing the crane 10. Preferably, a mast 36 is mounted on the carrier 25 and boom lift rigging 37 interconnects the tops of the mast 36 and the boom 27 ~or moving the boom vertically. The mast 36 ls secured by pendants 38 to gantry structure 3~ on the upper structure 11 to fo.rm a substantially rigid assembly, and other pendant~; 41 provide substantially rigid connections between the counterweight carrier 31 and the top of the mast 36. Str~ts 42 establish the substantially fixed angular position -to the mast 36. This geometry creates a stable~ high capacity crane.
A traveling support arrangement 45 is provided for support-ing the ring 15 under the fulcrum 28 to permit movemen-t of the crane 10 and ring 15 over the ground while the boom 27 is lifting a heavy load. In the preferred embodiment the traveling support 45 includes a pair of laterally spaced crawler assemblies 46 and 47 respectively located adjacent the forward ends of the support beams 16 and 17. The crawler assemblies 46, 47 are connected together by a frame element or car body 4~ which, in turn, is pivotally interconnected to a frame element 51 on which the ring 15 is supported. Preferably, the frame element 51 is connected to the car body 48 through a turntable 52 and to -the ring 15 through a plurality of shear plates 53 and lugs.
When a heavy load is lifted by the boom 27, the ~orces are transmitted do~n through the boom 27 and mast 36 to -the boom ~3~
arrier 25 riding on the riny 15 adjacent the fulcrum 28. The liEting forces are also transmitted through pendants ~1 to the counterweights 3~ stackecl on the carrier tending to lift the carrier 31 off the ring 15. Since the attachment ~rame element 51 supports the ring 15 adjacent the Eulcrum 28, the lifting forces pass primarily down through the ring 15 to the transport assembly and are resisted by the crawler assemblies 46, 47 engaging the ground.
Each of the crawler assemblies 45, 46 is independently powered to move the crane 10 under load by selectively and reversibly powering the crawlers 45, 46 such as by independent fixed and variable displacement hydraulic motors 65 and 66, respectively, such as shown in U.S. patent No. 4,000,78~l, whlch in incorporated herein by reference. Operation of these motors 65, 66 not only increases the traction power oE -the crane 10, since the load is primarily supported on the crawlers ~5, ~6, but also, insures more positive steering control when the crane is moved in a curved path.
The rear portion of the ring 15 is provided with support means 67 to support the ring during -travel and to resist rearward tipping of the crane 10 and ring 15 when a heavy load is not being supported by the boom 27. This avoids the necessity of removing portions o~ the coun-terweight 34 from the carrier between successive heavy lift operations. Preferably, the support means 67 includes a pair of laterally spaced crawler assemblies 68 and 69 respectively located adjacent the rear ends of the support beams ~6 and 17. The crawler assemblies are connected toge-ther by a cross frame 70 on which the rear portion of the ring is supported.
It should also be appreciated that the traveling support arrangement 45 and support means 67 may be quickly and conveniently attached and detached from a standard ring supported crane such as disclosed in U.S. patent No. 4,1~3~783 which is ncorporated herein by reference. As shown in that pa-tent, a plurality of ring support arms 71 are pivoted for vertical movement on the car body 12 and extend outwardly -to underlie the ring 15 at spaced points around the ring periphery. A plurality of jacks 72 are positioned one at the end of each of the arms 71 with the jacks 72 being sized so as to engage the ground when extended and lift the ring 15 and the car body 12 from the ground.
To Eacilitate setting up the ring lS~ hydraulic jacks 73 are mounted at the four ends of the support beams 16, 17.
Manipulation of these jacks 73 allows the ring 15 to be lifted and leveled, whereupon the manual jacks 72 can be quickly ex-tended to provide firm support for the ring completely around its periphery and to Eacilitate coupling and uncoupling the traveling support arrangement 45 and/or -the support means 67~
Claims (5)
1. A crane assembly having an upper structure pivoted on a lower car body with a pair of support beams secured to and forming a part of said lower car body, a track-like ring secured to said beams and horizontally surrounding said lower car body, said beams extending fore and aft beneath and beyond the periphery of said ring, a boom carrier pivoted for vertical movement on said upper structure and riding for rotation on said ring, a boom mounted on said boom carrier for lifting a load, a counterweight carrier pivoted for vertical movement on said upper structure and riding for rotation on said ring, means interconnecting said counterweight carrier and said boom for counteracting a heavy load, and characterized by a travel-ing support for said ring and crane assembly including front and rear pairs of laterally spaced crawler assemblies respect-ively attached outboard of said ring to the projecting ends of said pair of beams and means including respective frame elements interconnecting the crawler assemblies of each of said front and rear pairs and for supporting said ring between the ends of said support beams, said pair of front crawler assemblies each including an endless track and hydraulic motor means for selectively and reversibly driving said tracks to permit movement of said crane and ring over the ground while said boom is lifting a heavy load.
2. The combination of claim 1 wherein said front pair of crawler assemblies are connected to said frame elements through a pivot post and turntable mechanism.
3. The combination of claim 1 wherein said front pair of crawler assemblies are constructed as an independent self-propelled transporter unit which may be readily attached and detached from said ring.
4. The combination of claim 1 wherein said rear pair of crawler assemblies include tracks disposed for idling movement.
5. The combination of claim 1 wherein hydraulic jack means are provided at the ends of said pair of support beams for raising and lowering said front and rear pairs of crawler assemblies.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5828479A | 1979-07-17 | 1979-07-17 | |
| US058,284 | 1979-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1138824A true CA1138824A (en) | 1983-01-04 |
Family
ID=22015849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000354096A Expired CA1138824A (en) | 1979-07-17 | 1980-06-16 | Movable ring supported lift crane |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5617890A (en) |
| CA (1) | CA1138824A (en) |
| DE (1) | DE3026850A1 (en) |
| FR (1) | FR2461678B1 (en) |
| GB (1) | GB2053146B (en) |
| NL (1) | NL8003275A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4449635A (en) * | 1980-03-07 | 1984-05-22 | The Manitowoc Company, Inc. | Imaginary pivot lift crane |
| FR2528409B1 (en) * | 1982-06-11 | 1986-02-21 | Haulotte Atel Const A | ADDITIONAL EQUIPMENT ON A SELF-PROPELLED CRANE WITH TELESCOPIC BOOM |
| JPH0487607U (en) * | 1990-11-30 | 1992-07-30 | ||
| CA2266791C (en) | 1998-03-27 | 2005-02-01 | Manitowoc Crane Group, Inc. | Four track crawler crane |
| DE102005021859B4 (en) * | 2005-05-11 | 2007-03-29 | Terex-Demag Gmbh & Co. Kg | Lattice boom crane for lifting heavy loads |
| DE202006019192U1 (en) * | 2006-12-20 | 2008-05-08 | Liebherr-Werk Ehingen Gmbh | Mobile large crane |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3485383A (en) * | 1968-02-09 | 1969-12-23 | Manitowoc Co | Auxiliary support for cranes |
| FR1594609A (en) * | 1968-09-19 | 1970-06-08 | ||
| GB1203920A (en) * | 1968-10-15 | 1970-09-03 | American Hoist & Derrick Co | Improvements in or relating to load lifting equipment |
| US3836010A (en) * | 1972-01-19 | 1974-09-17 | Riggers Mfg Co | Counter-balanced crane structure |
| US3878944A (en) * | 1973-08-30 | 1975-04-22 | Dantel E Beduhn | Crane support structure |
| US3868022A (en) * | 1973-11-23 | 1975-02-25 | Harnischfeger Corp | Self-propelled heavy duty mobile crane |
| US4042115A (en) * | 1976-07-28 | 1977-08-16 | The Manitowoc Company, Inc. | Rotary counterweight crane with a removal track section |
| US4103783A (en) * | 1977-05-31 | 1978-08-01 | The Manitowoc Company, Inc. | Platform crane with counterweight and boom carrier support linkages |
-
1980
- 1980-06-04 NL NL8003275A patent/NL8003275A/en active Search and Examination
- 1980-06-16 CA CA000354096A patent/CA1138824A/en not_active Expired
- 1980-06-23 JP JP8413580A patent/JPS5617890A/en active Granted
- 1980-06-23 GB GB8020467A patent/GB2053146B/en not_active Expired
- 1980-07-09 FR FR8015271A patent/FR2461678B1/en not_active Expired
- 1980-07-16 DE DE19803026850 patent/DE3026850A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| NL8003275A (en) | 1981-01-20 |
| GB2053146A (en) | 1981-02-04 |
| JPS6127317B2 (en) | 1986-06-25 |
| DE3026850A1 (en) | 1981-02-05 |
| DE3026850C2 (en) | 1989-07-06 |
| GB2053146B (en) | 1983-02-16 |
| JPS5617890A (en) | 1981-02-20 |
| FR2461678A1 (en) | 1981-02-06 |
| FR2461678B1 (en) | 1986-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |