US3760953A - Self-erecting crane to be towed by a truck - Google Patents
Self-erecting crane to be towed by a truck Download PDFInfo
- Publication number
- US3760953A US3760953A US00183760A US3760953DA US3760953A US 3760953 A US3760953 A US 3760953A US 00183760 A US00183760 A US 00183760A US 3760953D A US3760953D A US 3760953DA US 3760953 A US3760953 A US 3760953A
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- Prior art keywords
- arm
- crane
- cable
- fixed
- boom
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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
- B66C23/26—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 for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
- B66C23/34—Self-erecting cranes, i.e. with hoisting gear adapted for crane erection purposes
Definitions
- the invention relates to self-erecting tower, cranes adapted to be towed by a road vehicle.
- the crane is of the kind comprising a lower arm vide a crane that can be erected or unfolded in a matter of a few seconds.
- the crane is characterized by the provision of an inextensible cable fixed at one end to the said rotatable frame of the crane and to the other end to the said middle arm adjacent to the hinge between the said lower arm and middle arm, said inextensible cable being wound around an arcuate sector fixed to the middle arm, whereby swinging of the hinged lower arm. by a capstan by means of a tackle device causes the opening out of the said middle arm from the said lower hinged arm.
- one end of the cable of the tackle device is fixed to the crane boom, and after the self-erection of the crane and fastening of the lower arm and-middle arm, and after opening out of the crane boom by means of a third cable, the same cable of the tackle device is utilized for vertically handling of a load.
- the crane capstan is provided with a flange with a notch for the rapid coupling of the end of a-branch of the cable for hoisting the crane boom, so as a different inclination of the boom is rendered possible by winding the said branch upon the capstan drum and by fixing another portion of the cable for hoisting the crane boom to the crane frame.
- FIG. I is a diagrammatic side elevation of the crane in the folded position
- FIG. 2 shows at a larger scale the portion A of FIG. 1 of the crane boom
- FIGS. 3 and 4 show as FIG. 1 diagrammatically in side elevation the crane in two intermediate stages during the self-erection
- FIG. 5 shows diagrammatically in side elevation the crane in its final self-erected stage
- FIG. 6 shows at a larger scale the portion B of FIG. 5,
- FIG. 7 shows at a larger scale the detail of the arcuated sector as visible in the FIG. 1,
- FIG. 8 shows at a larger scale the portion D of FIG. 5,
- FIG. 9 is a longitudinal schematic section of the drive capstan
- FIG. 10 is an elevation of the left side of FIG. 9 of the capstan showing the detail of the stop notch
- FIG. 11 shows at a larger scale the detail of the free hook end of the cable for modifying the inclination of the crane boom.
- the crane essentially consists of a capstan 1 driven by an electric motor, not shown, and mounted upon the crane frame 2, the latter being supported and rotatable upon a wheeled carriage 3 about a vertical axis.
- the foldable crane structure consists of three main parts, namely the boom F, a middle arm G and a lower arm H horizontally pivoted at 4 in the rotatable frame 2.
- the boom F and the middle part G are hinged at 5 adjacent to a pulley 6 and to the tip 7.
- the arm H and the middle arm G together form the tower of the crane and are hinged at 8 as shown.
- the truck 3, adapted to be towed by a road vehicle 9 is not particularly described since it is well known in the art.
- a tackle comprising a first set of sheaves 10 mounted at the bottom of the slewing frame 2, a second set of sheaves 11 mounted adjacent to the free end of the pivoting arm H and a first cable L represented by a chain-dotted line wound around the pulley 13, FIG.3, and around the pulley 14, the latter being coaxial with hinge 8 and then wound around a pulley 6 and lastly around the sheaves l6 17, then fixed at 15 to the boom F adjacent to the hinge 5.
- the cable L is of course fixed at its opposite end to the capstan drum.
- a second cable M represented by a chaindotted line has one end fixed at 18 to the frame 2, while the other end is fixed at 19 to the end of arm G after having passed around the pulley 20, along the arm H and engaging an arcuate sector 21 'as shown in FIGS. 7 and 8.
- This sector 21 traverses a slot 22 formed in the U profiled pivoting arm H when the crane is in the extended position, FIGS. 8 and 5.
- a spring 23 is frictionally housed into a sleeve fixed to the middle arm G and cooperates with a bracket 24 fixed to the pivoting arm H, whereby, as soon as the arm G and H assume an aligned position, the spring is compressed. This results in a reaction in a clockwise direction, FIG. 8, which induces the folding of the crane during the folding operation.
- a third cable N represented with full lines and fixed at one side at 18 to the frame 2 and at the other side to the tip 7 and to the end of boom F. From this cable N a branch N is wound around the capstan 1 after having its end 26 hooked within the L- profiled notch 27 of capstan drum flange 29.
- the branch N is represented thus The operation of the crane according to this invention is as follows:
- a self erecting tower foldable crane to be carried being articulated at one end to the lower arm and at the j opposite end to the crane boom, characterized by the provision of a capstan fixed to the crane frame of a main first cable,
- first cable and tackle means to swing the lower hinged arm of a tackle means, operated by the main cable by means of said capstan, of a second cable fixed at one end to the slewing crane frame and at the other end to the crane boom and operating for the self-erecting of the boom.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
In a tower crane consisting of three articulated members, viz. one lower member hinged to the slewing crane frame, a middle member articulated to the said lower member and articulated to the opposite end to the crane boom, the provision of an inextensible cable fixed at one end to the said slewing frame of crane and to the other end to the said middle member adjacently to the articulation between the said lower member and middle member, said inextensible cable being wound around an arcuated sector fixed to the middle member, whereby swinging of the hinged lower member by a capstan by means of a tackle device causes the self-erection of the tower.
Description
Unite States atent n 1 Cibin in; 3,760,953 1451 Sept. 25, 1973 SELF -ERECTING CRANE TO BE TOWED BY A TRUCK [76] Inventor: Egidio Cibin, c/o Dr. lng Misitano A.G. Via Padova 217, Milan, Italy [22] Filed: Sept. 27, 1971 21 Appl. No.: 183,760
[52] 11.8. CI. 212/46 A, 212/144 [51] Int. Cl. B66c 23/62 [58] Field of Search 212/46 R, 46 A, 46 B,
[56] References Cited UNITED STATES PATENTS 3,173,549 3/1965 Bender 212/46 R FOREIGN PATENTS OR APPLICATIONS 7/1964 Great Britain 212/46 A Great Britain 212/46 A 1,145,582 10/1957 France ..2I2/46B Primary Examiner-Harvey C. Hornsby [5 7] ABSTRACT In a tower crane consisting of three articulated members, viz. one lower member hinged to the slewing crane frame, a middle member articulated to the said lower member and articulated to the opposite end to the crane boom, the provision of an inextensible cable fixed at one end to the said slewing frame of crane and to the other end to the said middle member adjacently to the articulation between the said lower member and middle member, said inextensible cable being wound around an arcuated sector fixed to the middle member, whereby swinging of the hinged lower member by a capstan by means of a tackle device causes the selferection of the tower.
2 Claims, 11 Drawing Figures P/JENTED 3 760 953 sum: 0? 4 IN VENTOR PATENTED SEPZSIQH SHEET 2 0F 4 INVENTOH G im PATENTED EPZSlBZs SHEEIZIOF 4 INVENTOR- ldf 68 PATENTED 3,760,953
SHEET '4 BF 4 INVE NTQP SELF-ERECTING CRANE TO BE TOWED BY A TRUCK FIELD OF THE INVENTION The invention relates to self-erecting tower, cranes adapted to be towed by a road vehicle.
The crane is of the kind comprising a lower arm vide a crane that can be erected or unfolded in a matter of a few seconds.
SUMMARY OF THE INVENTION According to the invention the crane is characterized by the provision of an inextensible cable fixed at one end to the said rotatable frame of the crane and to the other end to the said middle arm adjacent to the hinge between the said lower arm and middle arm, said inextensible cable being wound around an arcuate sector fixed to the middle arm, whereby swinging of the hinged lower arm. by a capstan by means of a tackle device causes the opening out of the said middle arm from the said lower hinged arm.
According to a further feature one end of the cable of the tackle device is fixed to the crane boom, and after the self-erection of the crane and fastening of the lower arm and-middle arm, and after opening out of the crane boom by means of a third cable, the same cable of the tackle device is utilized for vertically handling of a load.
The crane capstan is provided with a flange with a notch for the rapid coupling of the end of a-branch of the cable for hoisting the crane boom, so as a different inclination of the boom is rendered possible by winding the said branch upon the capstan drum and by fixing another portion of the cable for hoisting the crane boom to the crane frame.
BRIEF DESCRIPTION OF THE'DRAWINGS The following is a detailed description of one embodiment of the invention, by way of example only, with reference to the accompanying drawings, wherein:
FIG. I is a diagrammatic side elevation of the crane in the folded position,
FIG. 2 shows at a larger scale the portion A of FIG. 1 of the crane boom,
FIGS. 3 and 4 show as FIG. 1 diagrammatically in side elevation the crane in two intermediate stages during the self-erection,
FIG. 5 shows diagrammatically in side elevation the crane in its final self-erected stage,
FIG. 6 shows at a larger scale the portion B of FIG. 5,
FIG. 7 shows at a larger scale the detail of the arcuated sector as visible in the FIG. 1,
FIG. 8 shows at a larger scale the portion D of FIG. 5,
FIG. 9 is a longitudinal schematic section of the drive capstan,
FIG. 10 is an elevation of the left side of FIG. 9 of the capstan showing the detail of the stop notch,
FIG. 11 shows at a larger scale the detail of the free hook end of the cable for modifying the inclination of the crane boom.
The crane essentially consists of a capstan 1 driven by an electric motor, not shown, and mounted upon the crane frame 2, the latter being supported and rotatable upon a wheeled carriage 3 about a vertical axis. The foldable crane structure consists of three main parts, namely the boom F, a middle arm G and a lower arm H horizontally pivoted at 4 in the rotatable frame 2.
The boom F and the middle part G are hinged at 5 adjacent to a pulley 6 and to the tip 7. The arm H and the middle arm G together form the tower of the crane and are hinged at 8 as shown. The truck 3, adapted to be towed by a road vehicle 9 is not particularly described since it is well known in the art.
There is provided a tackle comprising a first set of sheaves 10 mounted at the bottom of the slewing frame 2, a second set of sheaves 11 mounted adjacent to the free end of the pivoting arm H and a first cable L represented by a chain-dotted line wound around the pulley 13, FIG.3, and around the pulley 14, the latter being coaxial with hinge 8 and then wound around a pulley 6 and lastly around the sheaves l6 17, then fixed at 15 to the boom F adjacent to the hinge 5. The cable L is of course fixed at its opposite end to the capstan drum.
A second cable M, represented by a chaindotted line has one end fixed at 18 to the frame 2, while the other end is fixed at 19 to the end of arm G after having passed around the pulley 20, along the arm H and engaging an arcuate sector 21 'as shown in FIGS. 7 and 8.
This sector 21 traverses a slot 22 formed in the U profiled pivoting arm H when the crane is in the extended position, FIGS. 8 and 5. A spring 23 is frictionally housed into a sleeve fixed to the middle arm G and cooperates with a bracket 24 fixed to the pivoting arm H, whereby, as soon as the arm G and H assume an aligned position, the spring is compressed. This results in a reaction in a clockwise direction, FIG. 8, which induces the folding of the crane during the folding operation. A
When the capstan l is driven, thepivoting ann H is swung anticlockwise as seen in FIG. 1 and at an intermediate stage the cable M passes from a loose condition to a stretched condition. Since the cable M is inextensible, and its length is constant and the swinging of the hinged arm H strives to extend the cable M, there occurs an opening out movement of parts G and H until an alignment thereof is obtained. Also, the cable N at another intermediate stage passes from a loose condition to a stretched condition, FIG. 4, whereby an opening out movement of parts F and G is caused as a consequence of the continuation of the swinging movement of arm H and therefore of arm G. As soon as the vertical alignment of arms G and H is obtained and resulting horizontal positioning of the arm F, and the ends of parts G and H are locked with one another by a clamping device, whereby the stable connection of the parts is positively obtained.
When the capstan is driven in a reverse direction the crane eye hook of the crane is lowered and subsequently hoisted for a conventional handling of a load.
The operation of cable N is now described, to obtain the possibility of altering the position of the boom from a horizontal position to an inclined position, as shown with chain-dotted lines in FIG. 5. If the end 26 of branch cable N is engaged in the L-profiled notch 27 of the drum flange, driving of capstan and therefore rotation of the drum will cause an anti-clockwise rotation of the boom as viewed in FIG. 5 to the pre-established position. For rendering this position stable it is only required to engage a hole of a check plate K with a, not represented, pivot or hook fixed to the crane frame.
From the foregoing it will be apparent that by means of a single cable L not only the self-erection of the crane may be obtained but even the vertical handling of the different loads. It is also clear that by means of the same capstan, not only is the self-erection of the crane obtained but also the operative positioning of the boom F obtained, namely a position of the boom other than horizontal.
What I claim is:
1. A self erecting tower foldable crane to be carried being articulated at one end to the lower arm and at the j opposite end to the crane boom, characterized by the provision of a capstan fixed to the crane frame of a main first cable,
of a pulley and a cable arrangement between the crame frame, first cable and tackle means to swing the lower hinged arm of a tackle means, operated by the main cable by means of said capstan, of a second cable fixed at one end to the slewing crane frame and at the other end to the crane boom and operating for the self-erecting of the boom.
of an arcuated sector fixed to the said middle arm adjacently to the articulation of the latter with the said lower hinged arm,
and of a third inextensible cable extending around the arcuated sector, one end of the said inextensible cable being fixed to the said slewing crane frame and the opposite end of which being fixed to the said middle arm adjacently to the articulation with the said lower hinged arm, whereby swinging of the hinged lower arm by the capstan by means of the said tackle device causes the self-erection namely the opening out of the said middle arm from the said lower hinged to form a tower for the boom.
2. Crane according to the claim 1. wherein adjacently to the articulation of the said hinged arm with the said middle arm an adjustable spring is fixed with one end to the middle arm, and an L- profiled iron is welded to the lower hinged arm so as to cooperate with the said spring in the aligned position of the said lower hinged arm and middle arm and means are provided for adjusting the reaction of the spring,the compression of the spring in the aligned position of the lower arm and of the middle arm, causing a reaction torque promoting the folding operation of the crane.
Claims (2)
1. A self erecting tower foldable crane to be carried by a truck, of the kind consisting of a slewing crane frame rotatably mounted on said truck, a lower hinged arm, a middle arm and a crane boom, the lower hinged arm being pivoted to the said slewing, the middle arm being articulated at one end to the lower arm and at the opposite end to the crane boom, characterized by the provision of a capstan fixed to the crane frame of a main first cable, of a pulley and a cable arrangement between the crame frame, first cable and tackle means to swing the lower hinged arm of a tackle means, operated by the main cable by means of said capstan, of a second cable fixed at one end to the slewing crane frame and at the other end to the crane boom and operating for the self-erecting of the boom. of an arcuated sector fixed to the said middle arm adjacently to the articulation of the latter with the said lower hinged arm, and of a third inextensible cable extending around the arcuated sector, one end of the said inextensible cable being fixed to the said slewing crane frame and the opposite end of which being fixed to the said middle arm adjacently to the articulation with the said lower hinged arm, whereby swinging of the hinged lower arm by the capstan by means of the said tackle device causes the self-erection namely the opening out of the said middle arm from the said lower hinged to form a tower for the boom.
2. Crane according to the claim 1. wherein adjacently to the articulation of the said hinged arm with the said middle arm an adjustable spring is fixed with one end to the middle arm, and an L- profiled iron is welded to the lower hinged arm so as to cooperate with the said spring in the aligned position of the said lower hinged arm and middle arm and means are provided for adjusting the reaction of the spring,the compression of the spring in the aligned position of the lower arm and of the middle arm, causing a reaction torque promoting the folding operation of the crane.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18376071A | 1971-09-27 | 1971-09-27 |
Publications (1)
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US3760953A true US3760953A (en) | 1973-09-25 |
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Application Number | Title | Priority Date | Filing Date |
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US00183760A Expired - Lifetime US3760953A (en) | 1971-09-27 | 1971-09-27 | Self-erecting crane to be towed by a truck |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2431457A1 (en) * | 1978-07-22 | 1980-02-15 | Pekazett Baumasch | Portable crane mounted on vehicle - has hinged pylon and jib which can be folded about vertical axis to reduce length for transport |
US4706825A (en) * | 1985-05-22 | 1987-11-17 | Harsco Corporation | Portable folding bridge crane |
US5829605A (en) * | 1997-07-08 | 1998-11-03 | Poitras; Hermel G. | Mobile crane towable by a pickup truck |
WO2011034992A2 (en) | 2009-09-16 | 2011-03-24 | Rahim Rahim N | Aircraft fluid application system and method |
CN102491187A (en) * | 2011-11-25 | 2012-06-13 | 湖南省电力公司超高压管理局 | Portable self-supporting titanium alloy hydraulic hoisting derrick |
US10099597B2 (en) | 2016-08-18 | 2018-10-16 | Tommy Roberts | Portable hoist assembly |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1145582A (en) * | 1956-03-09 | 1957-10-28 | Telescopic mast transportable crane | |
GB965025A (en) * | 1961-07-31 | 1964-07-29 | Potain & Cie Ets F | Improvements in or relating to foldable tower cranes |
US3173549A (en) * | 1962-03-22 | 1965-03-16 | Emil A Bender | Material handling device |
GB1107670A (en) * | 1965-12-27 | 1968-03-27 | Richier Sa | Improvements in or relating to folding tower cranes |
-
1971
- 1971-09-27 US US00183760A patent/US3760953A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1145582A (en) * | 1956-03-09 | 1957-10-28 | Telescopic mast transportable crane | |
GB965025A (en) * | 1961-07-31 | 1964-07-29 | Potain & Cie Ets F | Improvements in or relating to foldable tower cranes |
US3173549A (en) * | 1962-03-22 | 1965-03-16 | Emil A Bender | Material handling device |
GB1107670A (en) * | 1965-12-27 | 1968-03-27 | Richier Sa | Improvements in or relating to folding tower cranes |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2431457A1 (en) * | 1978-07-22 | 1980-02-15 | Pekazett Baumasch | Portable crane mounted on vehicle - has hinged pylon and jib which can be folded about vertical axis to reduce length for transport |
US4706825A (en) * | 1985-05-22 | 1987-11-17 | Harsco Corporation | Portable folding bridge crane |
US5829605A (en) * | 1997-07-08 | 1998-11-03 | Poitras; Hermel G. | Mobile crane towable by a pickup truck |
WO2011034992A2 (en) | 2009-09-16 | 2011-03-24 | Rahim Rahim N | Aircraft fluid application system and method |
CN102491187A (en) * | 2011-11-25 | 2012-06-13 | 湖南省电力公司超高压管理局 | Portable self-supporting titanium alloy hydraulic hoisting derrick |
US10099597B2 (en) | 2016-08-18 | 2018-10-16 | Tommy Roberts | Portable hoist assembly |
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