CA1136389A - Crane conversion method - Google Patents
Crane conversion methodInfo
- Publication number
- CA1136389A CA1136389A CA000308676A CA308676A CA1136389A CA 1136389 A CA1136389 A CA 1136389A CA 000308676 A CA000308676 A CA 000308676A CA 308676 A CA308676 A CA 308676A CA 1136389 A CA1136389 A CA 1136389A
- Authority
- CA
- Canada
- Prior art keywords
- boom
- crane
- notches
- lifting
- main boom
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
- E02F3/963—Arrangements on backhoes for alternate use of different tools
Abstract
CRANE CONVERSION METHOD
ABSTRACT OF THE DISCLOSURE
Method and apparatus altering or retrofitting an excavating crane such as a trench hoe, back hoe, etc. into a lifting crane suitable for scrap handling are disclosed. The conversion is accomplished by outting V-shaped notches into the side plates of a conventional at a point adjacent and outboard of the point of connection between the main hydraulic piston and the main boom; bending the boom so that the edge surfaces formed by the sides of the V-shaped notches are brought into abutment and welding the same together. In this fashion the geometry of the main boom is altered without any necessity for altering either the pivot point, the stroke of the pistons, or any other portion of the overall crane in order to change the lifting arc and permit a greater lifting capability. By this modification, the crane becomes suitable for scrap handling wherein the problem is mainly lifting sub-stantial weights, as contrasted to excavating operations where the reach of the boom arm is primary importance. The inven-tion also contemplates applying reinforcing plates adjacent the weld point to strengthen the completed unit.
ABSTRACT OF THE DISCLOSURE
Method and apparatus altering or retrofitting an excavating crane such as a trench hoe, back hoe, etc. into a lifting crane suitable for scrap handling are disclosed. The conversion is accomplished by outting V-shaped notches into the side plates of a conventional at a point adjacent and outboard of the point of connection between the main hydraulic piston and the main boom; bending the boom so that the edge surfaces formed by the sides of the V-shaped notches are brought into abutment and welding the same together. In this fashion the geometry of the main boom is altered without any necessity for altering either the pivot point, the stroke of the pistons, or any other portion of the overall crane in order to change the lifting arc and permit a greater lifting capability. By this modification, the crane becomes suitable for scrap handling wherein the problem is mainly lifting sub-stantial weights, as contrasted to excavating operations where the reach of the boom arm is primary importance. The inven-tion also contemplates applying reinforcing plates adjacent the weld point to strengthen the completed unit.
Description
!
CRANE COMVERSION METHOD
This invention relates, in general, to heavy-duty cranes and relates, in particular, to a method and apparatus for converting a conventional crane designed primarily for digging or excavating purposes to one primarily designed for lifting purposes, with a minimum of modification and alter ation to the basic unit.
There are a number of known cranes on the market generally including a working platform mounted on a variety of carriages and being pivotable thereon about a vertical axis.
These units, generally, have a substantially L-shaped main boom which is pivotably mounted about a horizontal axis on the working platform and is movable to elevated or depressed con-dition by means of a hydraulic cylinder and piston. These cranes may be generically referred to as "knuckle boom"
cranes.
The outboard end of the main boom generally carries a jib boom which will have a shovel or other type excavating device on it. Such a boom is capable of reaching out from the working platform and, indeed, capable of being depressed so
CRANE COMVERSION METHOD
This invention relates, in general, to heavy-duty cranes and relates, in particular, to a method and apparatus for converting a conventional crane designed primarily for digging or excavating purposes to one primarily designed for lifting purposes, with a minimum of modification and alter ation to the basic unit.
There are a number of known cranes on the market generally including a working platform mounted on a variety of carriages and being pivotable thereon about a vertical axis.
These units, generally, have a substantially L-shaped main boom which is pivotably mounted about a horizontal axis on the working platform and is movable to elevated or depressed con-dition by means of a hydraulic cylinder and piston. These cranes may be generically referred to as "knuckle boom"
cranes.
The outboard end of the main boom generally carries a jib boom which will have a shovel or other type excavating device on it. Such a boom is capable of reaching out from the working platform and, indeed, capable of being depressed so
2~3 as to dig below the surface of the ground.
The prior art also discloses lifting-type cranes which have a somewhat sharper angular configuration to the main boom and which swing in an arc which permits greater weights to be lifted because of the fact that the arc is some-what shorter.
., ~ .
However, both of the crane units just described are specifically designed for a specific purpose.
Much the same can be said of the hoists or cranes disclosed in Woodside U.S. Patent 3,669,281; Suverkrop U.S.
Patent 3v754,666; and Nakajo U.S. E~atent 3,870,162.
Thus, Woodside U.S. Patent 3,699,281 discloses a specially designed boom and jib designed for lifting purposes.
Suverkrop U.S. Patent 3,745,666 discloses a folding crane designed for liftlng purposes with the capability of almost vertical lifting.
Nakajo U.S. Patent 3,870,162 is another foldable crane capable of achieving nearly vertical lifting.
However, none of the art known to Applicant dis-closes a method for converting a digging-type crane to the lifting-type crane without completely replacing the main boom arm which method is the principal object of this invention.
It has been found that what may be called a digging-type crane can be converted to a lifting-type crane simply, econcomically, and effectively by simply cutting V-shaped notches in the side panels of the main boom adjacent its point of interconnection with the main hydraulic cylinder and out-board thereof. Once this has been done, it is a simple matter to bring the opposed edges of the V-shaped notch together and weld them securely together. In this fashion, the basic geometry of the main boom is altered so that the operating arc is thrown up into the air rather than out into the ground.
, ~ '^''. ~''..' : '`
., -~a~l 3~i3l~'~
This permits a much greater lifting capability both from the standpoint of the weight which can be lifted and the elevation to which that weight can be lifted, since the outboard end of the jib is thus thrown much higher.into the air. ~ll of this is accompl:Lshed without modifica-tion of any other part of the ovexall crane assembly.
It has also been found that even greater improved results can be achieved by welding or otherwise securing reinforcing plates in an overlying relationship to the point of welding.
According to one aspect of this invention there is provided a method of retrofitting a knuckle boom crane designed for excavating purposes and having a main boom consisting of first and second integral sections forming an L-shaped profile to a conf-iguration suitable fur lift-ing purposes comprising the steps of A) modifying the geometry of said main boom by cutting a pair of opposed V-shaped notches into the sidewalls of said main boom with the apexes of the notches directed toward and termi-nating adjacent the bottom wall of the boom; B) cuttinga portion of the top wall corresponding to the bases of said ~-shaped notches; C) re~;oving the portions thus cut~ D) bending said boom about the apexes of said notches so that the edge surface formed by said cutti~g step are in abutment with each other and so that said first and second sections are substantially coextensive;
E) welding said edge surfaces together; and F) securing reinforci~g plates to the outer surface of the sidewalls of said boom in overlying relationship with the line of welding.
OF THE DRAWINGS:
FIGURE 1 is an elevational view of a conventional digging-type crane.
FIGURE 2 is a view similar to FIGURE 1 following modification of the main boom.
FIGURE 3 is a partial elevational vie~ showin~
the main boom with the V-shaped notches cut therein.
-4a-: -.
~ .
~3~3~
FIGURE 4 is a view similar to FIGURE 3 showing the edges of the notches welded together.
FIGURE 5 is a view similar to FIGURES 3 and 4 showing the reinforcing plates in position.
FIGURE 6 is a sectional view taken along the line 6-6 of FIGURE 5.
Referring first to FIGURE 1 of the drawings, it will be noted that the crane, generally indicated by the numeral 10, includes a crawler-type track system 11, a working plat-form 12 which supports an operator's cab 13, and a power source 14. The working platform 12 is mounted or secured to the crawl~r or track mechanism 11 in a pivotable arrangement, with all of this structure being quite conventional and well known in the art. In that re~ard, this structure has been shown schematically only, since this type of overall arrange-ment is very well known. It should also be noted that a tracked support has been illustrated but it will be understood that cranes of this general type are also commonly mounted on trucks or wagons! for example.
Mounted on the working platform 12 is a main boom 20 which is pivotally supported on the platform as at 21 so that the boom 20 can be elevated OL depressed, as desired, in res-ponse to actuation of the main hydraulic cylinder 30 and the piston 30a which is itself pivotally mounted to the platform at 31 and secured to the boom at 32.
~ll3~ 3~
Again, this basic structure is known in the art and has not been described in great detail.
A jib 40 is pivotally mounted at 41 on the outer end of the main boom 20. Main boom 20 carries a support baracket 51 which mounts a second hydraulic: cylinder 50 which is in turn secured to the jib at 52 so that the jib itself can be manipulated independently of the main boom 20.
Once more, this structure is essentially con-ventional.
FIGURE 1 illustrates a boom having a configuration which is common for excavating or digging-type cranes so that maximum reach out away from the working platform is achieved both in a direction parallel to the ground as well as in a direction beneath the ground line. It should be noted here that in FIGURE 1 jib 40 is at its maximum elevation.
In retrofitting, according to the method of this in-vention, reference is made first to FIGURE 3 of the drawings wherein it will be noted that a V-shaped notch, generally in-dicated by the arrow 60, is cut into each of the side plates 20a and 20b of the main boom 20 at a point that is outboard of the point of attachment 32 of the main hydraulic cylinder and piston 30. The ape~ of the notch, indicated at 61 in FIGURE 3, is directed toward the bottom plate 20c of the boom 20. The side edges 62 and 63 of the notch are also illustrated in FIGURE 3, with it being noted that only one side of the boom is shown, but that a similar notch îs cut in both side plates 20a and 20b of the main boom 20 and the notches are in alignment.
..
Once the notches have been cut, the boom is pivoted about the apex 61 of each of the notches so that the edges 62 and 63 of each side plate 20a and 20b are brought into abut-ment, following which they are welded together as at 64 (See FIGUR~ 4). FIGURES 2 and 5 clearly show the new configuration of the main boom 20 following the c:utting and welding steps.
It has been found furthermore that improved results can be obtained by welding a plate 66 as at 65, (See FIGU~E S~
to the outboard faces of sidewalls 20a and ~Ob in overlying relationship to the weld 64.
Referring to FIGURE 2 of the drawings, it will be noted that effectively the arc of movement possible with the crane has then been altered so as to throw the arc up into the air, in effect, and permit much greater elevation for lifting purposes. Comparison of the jib position of FIGU~ES 1 and 2 will illustrate the difference in operating capabilities.
Thus, FIGURE 1 illustrates maximum elevation prior to retro-fitting while FIGURE 2 shows maximum elevation after retro-fitting.
This is particularly important with regard to scrap handling operations wherein a load is picked off the ground and deposited in a receptacle such as a hopper, a truck, etc~
Furthermore, the lifting capacity of the crane will have been greatly enhancecl because of the fact that the lifting operation takes place more in a direct line and closer to the center of gravity of the prime mover.
', :' ~7~ ~
~ .
Thus, a crane which has been primarily designed for digqing or excavating purposes wil:L have been converted in~o one whose primary function and feasibility will be for lifting purposes.
It should be noted that all of this will be accom-plished without modification of any part of the overall crane assembly or relocation of any oi- the components thereof, except for the simple step of cutting the notches in the main boom 20 and joining the edges of the notches together to ef-fectively change the geometry of the main boom 20 and therebycompletely transform the operating characteristics of the overall crane assembly 10. No changes in the jib, except for replacing the usual bucket, are required. Nor are pistons 80 and 50 required to be modified.
While a full and complete description of the inv~ntion has been set forth in accordance with the dictates of the Patent Statutes, it should be understood that modifica-tions can be resorted to without departing from the spirit hereof or the scope of the appended claims.
' : ' .. . . . . .
",: ,.
. i ~ : . . :
The prior art also discloses lifting-type cranes which have a somewhat sharper angular configuration to the main boom and which swing in an arc which permits greater weights to be lifted because of the fact that the arc is some-what shorter.
., ~ .
However, both of the crane units just described are specifically designed for a specific purpose.
Much the same can be said of the hoists or cranes disclosed in Woodside U.S. Patent 3,669,281; Suverkrop U.S.
Patent 3v754,666; and Nakajo U.S. E~atent 3,870,162.
Thus, Woodside U.S. Patent 3,699,281 discloses a specially designed boom and jib designed for lifting purposes.
Suverkrop U.S. Patent 3,745,666 discloses a folding crane designed for liftlng purposes with the capability of almost vertical lifting.
Nakajo U.S. Patent 3,870,162 is another foldable crane capable of achieving nearly vertical lifting.
However, none of the art known to Applicant dis-closes a method for converting a digging-type crane to the lifting-type crane without completely replacing the main boom arm which method is the principal object of this invention.
It has been found that what may be called a digging-type crane can be converted to a lifting-type crane simply, econcomically, and effectively by simply cutting V-shaped notches in the side panels of the main boom adjacent its point of interconnection with the main hydraulic cylinder and out-board thereof. Once this has been done, it is a simple matter to bring the opposed edges of the V-shaped notch together and weld them securely together. In this fashion, the basic geometry of the main boom is altered so that the operating arc is thrown up into the air rather than out into the ground.
, ~ '^''. ~''..' : '`
., -~a~l 3~i3l~'~
This permits a much greater lifting capability both from the standpoint of the weight which can be lifted and the elevation to which that weight can be lifted, since the outboard end of the jib is thus thrown much higher.into the air. ~ll of this is accompl:Lshed without modifica-tion of any other part of the ovexall crane assembly.
It has also been found that even greater improved results can be achieved by welding or otherwise securing reinforcing plates in an overlying relationship to the point of welding.
According to one aspect of this invention there is provided a method of retrofitting a knuckle boom crane designed for excavating purposes and having a main boom consisting of first and second integral sections forming an L-shaped profile to a conf-iguration suitable fur lift-ing purposes comprising the steps of A) modifying the geometry of said main boom by cutting a pair of opposed V-shaped notches into the sidewalls of said main boom with the apexes of the notches directed toward and termi-nating adjacent the bottom wall of the boom; B) cuttinga portion of the top wall corresponding to the bases of said ~-shaped notches; C) re~;oving the portions thus cut~ D) bending said boom about the apexes of said notches so that the edge surface formed by said cutti~g step are in abutment with each other and so that said first and second sections are substantially coextensive;
E) welding said edge surfaces together; and F) securing reinforci~g plates to the outer surface of the sidewalls of said boom in overlying relationship with the line of welding.
OF THE DRAWINGS:
FIGURE 1 is an elevational view of a conventional digging-type crane.
FIGURE 2 is a view similar to FIGURE 1 following modification of the main boom.
FIGURE 3 is a partial elevational vie~ showin~
the main boom with the V-shaped notches cut therein.
-4a-: -.
~ .
~3~3~
FIGURE 4 is a view similar to FIGURE 3 showing the edges of the notches welded together.
FIGURE 5 is a view similar to FIGURES 3 and 4 showing the reinforcing plates in position.
FIGURE 6 is a sectional view taken along the line 6-6 of FIGURE 5.
Referring first to FIGURE 1 of the drawings, it will be noted that the crane, generally indicated by the numeral 10, includes a crawler-type track system 11, a working plat-form 12 which supports an operator's cab 13, and a power source 14. The working platform 12 is mounted or secured to the crawl~r or track mechanism 11 in a pivotable arrangement, with all of this structure being quite conventional and well known in the art. In that re~ard, this structure has been shown schematically only, since this type of overall arrange-ment is very well known. It should also be noted that a tracked support has been illustrated but it will be understood that cranes of this general type are also commonly mounted on trucks or wagons! for example.
Mounted on the working platform 12 is a main boom 20 which is pivotally supported on the platform as at 21 so that the boom 20 can be elevated OL depressed, as desired, in res-ponse to actuation of the main hydraulic cylinder 30 and the piston 30a which is itself pivotally mounted to the platform at 31 and secured to the boom at 32.
~ll3~ 3~
Again, this basic structure is known in the art and has not been described in great detail.
A jib 40 is pivotally mounted at 41 on the outer end of the main boom 20. Main boom 20 carries a support baracket 51 which mounts a second hydraulic: cylinder 50 which is in turn secured to the jib at 52 so that the jib itself can be manipulated independently of the main boom 20.
Once more, this structure is essentially con-ventional.
FIGURE 1 illustrates a boom having a configuration which is common for excavating or digging-type cranes so that maximum reach out away from the working platform is achieved both in a direction parallel to the ground as well as in a direction beneath the ground line. It should be noted here that in FIGURE 1 jib 40 is at its maximum elevation.
In retrofitting, according to the method of this in-vention, reference is made first to FIGURE 3 of the drawings wherein it will be noted that a V-shaped notch, generally in-dicated by the arrow 60, is cut into each of the side plates 20a and 20b of the main boom 20 at a point that is outboard of the point of attachment 32 of the main hydraulic cylinder and piston 30. The ape~ of the notch, indicated at 61 in FIGURE 3, is directed toward the bottom plate 20c of the boom 20. The side edges 62 and 63 of the notch are also illustrated in FIGURE 3, with it being noted that only one side of the boom is shown, but that a similar notch îs cut in both side plates 20a and 20b of the main boom 20 and the notches are in alignment.
..
Once the notches have been cut, the boom is pivoted about the apex 61 of each of the notches so that the edges 62 and 63 of each side plate 20a and 20b are brought into abut-ment, following which they are welded together as at 64 (See FIGUR~ 4). FIGURES 2 and 5 clearly show the new configuration of the main boom 20 following the c:utting and welding steps.
It has been found furthermore that improved results can be obtained by welding a plate 66 as at 65, (See FIGU~E S~
to the outboard faces of sidewalls 20a and ~Ob in overlying relationship to the weld 64.
Referring to FIGURE 2 of the drawings, it will be noted that effectively the arc of movement possible with the crane has then been altered so as to throw the arc up into the air, in effect, and permit much greater elevation for lifting purposes. Comparison of the jib position of FIGU~ES 1 and 2 will illustrate the difference in operating capabilities.
Thus, FIGURE 1 illustrates maximum elevation prior to retro-fitting while FIGURE 2 shows maximum elevation after retro-fitting.
This is particularly important with regard to scrap handling operations wherein a load is picked off the ground and deposited in a receptacle such as a hopper, a truck, etc~
Furthermore, the lifting capacity of the crane will have been greatly enhancecl because of the fact that the lifting operation takes place more in a direct line and closer to the center of gravity of the prime mover.
', :' ~7~ ~
~ .
Thus, a crane which has been primarily designed for digqing or excavating purposes wil:L have been converted in~o one whose primary function and feasibility will be for lifting purposes.
It should be noted that all of this will be accom-plished without modification of any part of the overall crane assembly or relocation of any oi- the components thereof, except for the simple step of cutting the notches in the main boom 20 and joining the edges of the notches together to ef-fectively change the geometry of the main boom 20 and therebycompletely transform the operating characteristics of the overall crane assembly 10. No changes in the jib, except for replacing the usual bucket, are required. Nor are pistons 80 and 50 required to be modified.
While a full and complete description of the inv~ntion has been set forth in accordance with the dictates of the Patent Statutes, it should be understood that modifica-tions can be resorted to without departing from the spirit hereof or the scope of the appended claims.
' : ' .. . . . . .
",: ,.
. i ~ : . . :
Claims (2)
1. A method of retrofitting a knuckle boom crane designed for excavating purposes and having a main boom consisting of first and second integral sections forming an L-shaped profile to a configuration suitable for lift-ing purposes comprising the steps of A) modifying the geometry of said main boom by cutting a pair of opposed V-shaped notches into the sidewalls of said main boom with the apexes of the notches directed toward and termi-nating adjacent the bottom wall of the boom; B) cutting a portion of the top wall corresponding to the bases of said V-shaped notches; C) removing the portions thus cut; D) bending said boom about the apexes of said notches so that the edge surface formed by said cutting step are in abutment with each other and so that said first and second sections are substantially coextensive;
E) welding said edge surfaces together; and F) securing reinforcing plates to the outer surface of the sidewalls of said boom in overlying relationship with the line of welding.
E) welding said edge surfaces together; and F) securing reinforcing plates to the outer surface of the sidewalls of said boom in overlying relationship with the line of welding.
2. The method of Claim 1 wherein said notches are cut at a point between the interconnection of said main boom and its associated hydraulic piston and the out-board end of the boom.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US823,597 | 1977-08-11 | ||
| US05/823,597 US4105151A (en) | 1977-08-11 | 1977-08-11 | Crane conversion method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1136389A true CA1136389A (en) | 1982-11-30 |
Family
ID=25239196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000308676A Expired CA1136389A (en) | 1977-08-11 | 1978-08-03 | Crane conversion method |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4105151A (en) |
| CA (1) | CA1136389A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4247035A (en) * | 1977-08-11 | 1981-01-27 | Eltzroth James L | Crane conversion method |
| GB2049615B (en) * | 1979-05-19 | 1983-04-27 | Orenstein & Koppel Ag | Hydraulic excavator |
| US4602462A (en) * | 1984-11-16 | 1986-07-29 | Altec Industries, Inc. | Boom articulating mechanism for aerial devices |
| US4880123A (en) * | 1988-05-11 | 1989-11-14 | Norris Jr Harold G | Method for converting a digging boom to a lifting boom |
| US5833384A (en) * | 1996-12-06 | 1998-11-10 | Cmi-Equipment & Engineering, Inc. | Bracket mounting arrangement for machine frames |
| US8863966B2 (en) | 2011-03-21 | 2014-10-21 | Dynaking Crane, Llc | Kingpost crane apparatus and method |
| DE102017223240A1 (en) * | 2017-12-19 | 2019-06-19 | Putzmeister Engineering Gmbh | Concrete pump mast arm segment with longitudinally variable plate thickness and method of making such a concrete pump mast arm segment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3149730A (en) * | 1962-06-08 | 1964-09-22 | Bucyrus Erie Co | Convertible crane |
| US3777918A (en) * | 1970-02-02 | 1973-12-11 | Yaun Manuf Co Inc | Material handling implement |
-
1977
- 1977-08-11 US US05/823,597 patent/US4105151A/en not_active Expired - Lifetime
-
1978
- 1978-08-03 CA CA000308676A patent/CA1136389A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4105151A (en) | 1978-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |