CA1076068A - Loading apparatus with extension boom (telescopic boom) and with hydraulic lines carried by the boom - Google Patents
Loading apparatus with extension boom (telescopic boom) and with hydraulic lines carried by the boomInfo
- Publication number
- CA1076068A CA1076068A CA281,112A CA281112A CA1076068A CA 1076068 A CA1076068 A CA 1076068A CA 281112 A CA281112 A CA 281112A CA 1076068 A CA1076068 A CA 1076068A
- Authority
- CA
- Canada
- Prior art keywords
- boom
- boom section
- section
- bight
- loop
- 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
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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
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
- B66C13/14—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices to load-engaging elements or motors associated therewith
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
Abstract
Abstract :
The disclosure relates to a loading apparatus comprising an outer boom and an extension boom (telescopic boom), wherein the C-shaped bight of the hydraulic line, which bight extends in a rearward direction longitudinally of the outer boom and the telescopic boom, is housed in its entirety in a space defined by the walls of the telescopic boom and the outer boom and so arranged that, in all positions of the C-bight at the movements of the bight during extension and retraction of the telescopic boom, the opposite parts of the loop in the area of transition to the C-bight are defined by two relatively fixed walls situated between adjoin-ing surfaces of the telescopic boom and the outer boom.
The disclosure relates to a loading apparatus comprising an outer boom and an extension boom (telescopic boom), wherein the C-shaped bight of the hydraulic line, which bight extends in a rearward direction longitudinally of the outer boom and the telescopic boom, is housed in its entirety in a space defined by the walls of the telescopic boom and the outer boom and so arranged that, in all positions of the C-bight at the movements of the bight during extension and retraction of the telescopic boom, the opposite parts of the loop in the area of transition to the C-bight are defined by two relatively fixed walls situated between adjoin-ing surfaces of the telescopic boom and the outer boom.
Description
This invention relates to loading apparatuses of the type comprising an outer boom and an extension boom ttelescopic boom) telescopically extendable in the outer boom as well as at least one hydraulic line which extends with a flexible elastic portion from the outer boom to the telescopic boom in a sufficiently large bight-forming loop to permit maximum extension of the telescopic boom in relation to the outer boom.
; Hydraulic lines extending from an outer boom past or via an extension boom in said outer boom to for instance operating cylinders for a grapple or like loading implement carried at the outer end of the extension boom always prove difficult to arrange in a simple manner and at the same time in such way that the lines are well protected and can be extended and retracted without being damaged at the retraction and extension movements of the telescopic boom.
A common type of loader in which problems of this kind often occurs is the two section knuckle boom. To permit increasing the reach of the boom system the outer boom is usual-ly made extendable by means of an extension boom or telescopic boom, in which case the grapple or like loading implement is carried at the outer end of the telescopic boom. The first section of the boom and the outer boom as well as the telescopic . boom are usually box beams. A hydraulic cylinder mounted within the first boom section and the telescopic boom usually serves as means for extending and retracting the telescopic boom (which may be divided into several telescoping sections). The hydraulic lines to be connected to said cylinder extend from the first 1~76068 boom section usually externally past the joint between the first boom section and the outer boom and,run into said outer boom, but in addition the hydraulic lines must extend from the outer boom to the lifting implement carried by the telescopic boom.
The last-mentioned hydraulic lines must be of a length per-mitting maximum extension of the telescopic boom. When the telescopic boom is retracted these lines consequently are too long and form bights.
In this type of knuckle booms the problem of running the hydraulic lines has been solved in many different ways.
In the simplest solutions, flexible hydraulic hoses extend from the outer boom beneath the telescopic boom and via the front end of said telescopic boom to the loading implement. Vpon retraction of the telescopic boom said hoses are allowed to place themselves in entirely deliberate depending bights with the ensuing risk that they will obstruct operation and may easily be damaged. More complex and expensive arrangements include protective pipes and guides for flexible hose sections or telescopically extendable pipes which are exposed to wear and give rise to sealing problems.
It may seem obvious to place the hydraulic lines well protected within or without the first boom section and the outer boom since it is prior art and conventional to place the hydraulic lines protected within the first boom section and also within the outer boom when said outer boom is not telescopically extendable. However, it is by far simpler to arrange hydraulic lines ln a well protected locat~on ln knuckle boom systems ` 1076068 having boom sections of constant length than in telescopically extendable boom sections, and so far no solution has been suggested, that can be considered satisfactory in view of both the requirement for simplicity and low cost and the re-quirement for protection against damage and wear.
It is an object of an aspect of this invention to provide an apparatus which satisfactorily meets these re-quirements and in which the C-shaped bight of the hydraulic line, which bight extends in a rearward direction longitudinal-ly of the outer boom ahd the telescopic boom, is housed in its entirety in a space defined by the walls of the telescopic -~ boom and the outer boom and so arranged that, in all positions of the C~bight at the movements of the bight during extension and retraction of the telescopic boom, the opposite parts of the loop in the area of transition to the C-bight are defined by two relatively fixed walls situated between adjoining surfaces of the telescopic boom and the outer boom.
In accordance with one aspect of this invention there is provided a telescopically extensible boom loading apparatus comprising an outer hollow boom section, an inner boom section in telescopic relationship in said boom, and at least one flexible hydraulic hose extending with a flexible section from said outer hollow boom section to said inner telescopic boom section, said flexible hose being of sufficient length to permit maximum extension of the inner telescopic boom section in relation to the outer boom section and forming a loop having a pair of opposite legs and a substantially C-shaped bight extending from and connecting each of said legs to the other, and further extending in a longitudinal direction in said telescopically extensible boom, one of said ~loop legs being shortened and the other lengthened, and _ ~
``- 1076068 vice versa, and the C-bight being moved longitudinally in the boom when the boom sections are extended and retracted, wherein said inner boom section comprises a longitudinal web and at least one protruding flange forming a guide and spacer means for guiding the inner boom section in the outer hollow boom section with the web of the inner boom section in spaced relation to at least one inner side of the outer boom section, the said inner side of the hollow outer boom section and said web and flange of the inner boom section forming, when the inner boom section is retracted in the outer boom section, an open ended channel; and wherein said loop with its C-bight are housed in said channel between the said inner side of said outer boom section and the said web of the inner boom section with one of the legs of said loop of the flexible hose being seated on the protruding flange.
Embodiments of the invention will be more fully described hereinbelow with reference to accompanying drawings in which;
Fig. 1 is a longitudinal sectional view of a knuckle boom including an outer boom and an extension boom telescopically movable therein and containing hydraulic lines arranged in accordance with the present invention;
Fig. 2 is a perspective view of the outer end portion of a box beam type outer boom and an extension boom telescopically movable therein, said extension boom being of modified I-section ~, - 3a -in order to permit placing the hydraulic lines, in conformity with a preferred embodiment of the invention, in protective channels defined by the flanges of the I-section;
Fig. 3 is a modification of Fig. 2, and Fig. 4 is an embodiment of the invention which is a combination of the embodiments in Figs. 1 and 2 and is applied to a boom system in which the telescopically extendable boom com-prises two relatively telescoping boom sections.
In the embodiment of Fig. 1 the outer boom 1 of a loading apparatus of prior-art design, is shown by way of example. The loading apparatus includes in addition to the outer boom a first boom section (not shown) to which the outer boom is pivoted. The outer boom 1 is in the form of a box beam, and an extension boom is movably arranged in the outer boom.
In a loading apparatus of the kind indicated the extension boom ls usually termed telescopic boom and is adapted to carry at its front end (at 3) a loading implement (not shown) operated by hydraulic cylinders. The telescopic boom 2 is movable in the outer boom 1 by means of a hydraulic cylinder 4 whose piston rod 5 in the embodiment illustrated is rearwardly directed for a reason that will appear from the following.
The hydraulic connection to the hydraulic cylinder 4 is provided in a conventional manner, which is not, however, illustrated and neither described since the invention is di-rected to the problem of running the lines to the operating cylinders of the loading implement, which in the embodiment illustrated are assumed to require four hydraulic lines 6.
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~76068 For the sake of simplicity only one of these four lines is shown in Fig. 1.
The most usual way of arranging the hydrauli-c connections with the loading implement is to use hoses which extend from a point midway between the two ends of the outer boom in large depending bights to a fastening at the front end of the tele-scopic boom. The hose bights must be of a sufficiently long length to allow maximum extension of the telescopic boom without using a stretching tension in the hydraulic hoses.
These depending hose bights which can be found in most, for instance,vehicle-mounted booms of the type herein contemplated are very vulnerable and very cumbersome to the operation of the booms, for example in forest land.
According to the invention, however, each hydraulic hose 6 is laid in a single loop within the outer and tele-scopic booms, and the arrangement is such that the bight forma-tion and the hose movement take place in a predetermined manner.
As illustrated in Fig. 1, the hose 6 extends in a long loop into the open front end of the teiescopic boom 2, through said telescopic boom and from said boom into the outer boom 1 where the hose forms a C-shaped bight. From this bight the hose extends in a direction back towards the front end of the telescopic boom in a space 7 between the adjoining lower walls 8, 9 of the outer and telescopic booms, protruding through an opening 10 in the wall 8 of the outer boom. From the opening 10 the hose can extend along the outer boom to-wards the rear end thereof, for instance through a protective ..
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pipe (not shown~ fixed to the underside of said outer boom.
In Fiq, 1 the hose bight portions located in the booms are designated 6a, 6c and the bight proper is designated 6b, while the hose portion extracted through the opening 10 in the outer boom is designated 6d. To provide the space 7 between the telescopic boom and the outer boom the telescopic boom is carried at a distance from the lower wall 8 of the outer boom by means of a pair of sliding and supporting bearings (alternatively rollers) 11 in the front end portion of the outer boom in a manner that will appear from Fig. 1. The opening 10 is provided near the rear one of said bearings 11.
The hose 6 extends about the cylinder 4 in the longitudinal direction thereof, the hose bight 6b being placed laterally of the piston rod 5. With four hoses 6, two hose bights 6b should be placed on one side of the piston rod 5 and the other two hose bights on the other side of the piston rod.
To provide as ample a room as possible for these hose bights, that is laterally of the piston rod, the cylinder is placed in an entirely reversed position relative to its normal posi-tion.
- The configuration of each hose bight 6b is detenmined by the room available for the loop run portions closest to the bight between the upper wall 12 of the telescopic boom 2 and the lower wall 8 of the outer boom 1. When the telescopic boom
; Hydraulic lines extending from an outer boom past or via an extension boom in said outer boom to for instance operating cylinders for a grapple or like loading implement carried at the outer end of the extension boom always prove difficult to arrange in a simple manner and at the same time in such way that the lines are well protected and can be extended and retracted without being damaged at the retraction and extension movements of the telescopic boom.
A common type of loader in which problems of this kind often occurs is the two section knuckle boom. To permit increasing the reach of the boom system the outer boom is usual-ly made extendable by means of an extension boom or telescopic boom, in which case the grapple or like loading implement is carried at the outer end of the telescopic boom. The first section of the boom and the outer boom as well as the telescopic . boom are usually box beams. A hydraulic cylinder mounted within the first boom section and the telescopic boom usually serves as means for extending and retracting the telescopic boom (which may be divided into several telescoping sections). The hydraulic lines to be connected to said cylinder extend from the first 1~76068 boom section usually externally past the joint between the first boom section and the outer boom and,run into said outer boom, but in addition the hydraulic lines must extend from the outer boom to the lifting implement carried by the telescopic boom.
The last-mentioned hydraulic lines must be of a length per-mitting maximum extension of the telescopic boom. When the telescopic boom is retracted these lines consequently are too long and form bights.
In this type of knuckle booms the problem of running the hydraulic lines has been solved in many different ways.
In the simplest solutions, flexible hydraulic hoses extend from the outer boom beneath the telescopic boom and via the front end of said telescopic boom to the loading implement. Vpon retraction of the telescopic boom said hoses are allowed to place themselves in entirely deliberate depending bights with the ensuing risk that they will obstruct operation and may easily be damaged. More complex and expensive arrangements include protective pipes and guides for flexible hose sections or telescopically extendable pipes which are exposed to wear and give rise to sealing problems.
It may seem obvious to place the hydraulic lines well protected within or without the first boom section and the outer boom since it is prior art and conventional to place the hydraulic lines protected within the first boom section and also within the outer boom when said outer boom is not telescopically extendable. However, it is by far simpler to arrange hydraulic lines ln a well protected locat~on ln knuckle boom systems ` 1076068 having boom sections of constant length than in telescopically extendable boom sections, and so far no solution has been suggested, that can be considered satisfactory in view of both the requirement for simplicity and low cost and the re-quirement for protection against damage and wear.
It is an object of an aspect of this invention to provide an apparatus which satisfactorily meets these re-quirements and in which the C-shaped bight of the hydraulic line, which bight extends in a rearward direction longitudinal-ly of the outer boom ahd the telescopic boom, is housed in its entirety in a space defined by the walls of the telescopic -~ boom and the outer boom and so arranged that, in all positions of the C~bight at the movements of the bight during extension and retraction of the telescopic boom, the opposite parts of the loop in the area of transition to the C-bight are defined by two relatively fixed walls situated between adjoining surfaces of the telescopic boom and the outer boom.
In accordance with one aspect of this invention there is provided a telescopically extensible boom loading apparatus comprising an outer hollow boom section, an inner boom section in telescopic relationship in said boom, and at least one flexible hydraulic hose extending with a flexible section from said outer hollow boom section to said inner telescopic boom section, said flexible hose being of sufficient length to permit maximum extension of the inner telescopic boom section in relation to the outer boom section and forming a loop having a pair of opposite legs and a substantially C-shaped bight extending from and connecting each of said legs to the other, and further extending in a longitudinal direction in said telescopically extensible boom, one of said ~loop legs being shortened and the other lengthened, and _ ~
``- 1076068 vice versa, and the C-bight being moved longitudinally in the boom when the boom sections are extended and retracted, wherein said inner boom section comprises a longitudinal web and at least one protruding flange forming a guide and spacer means for guiding the inner boom section in the outer hollow boom section with the web of the inner boom section in spaced relation to at least one inner side of the outer boom section, the said inner side of the hollow outer boom section and said web and flange of the inner boom section forming, when the inner boom section is retracted in the outer boom section, an open ended channel; and wherein said loop with its C-bight are housed in said channel between the said inner side of said outer boom section and the said web of the inner boom section with one of the legs of said loop of the flexible hose being seated on the protruding flange.
Embodiments of the invention will be more fully described hereinbelow with reference to accompanying drawings in which;
Fig. 1 is a longitudinal sectional view of a knuckle boom including an outer boom and an extension boom telescopically movable therein and containing hydraulic lines arranged in accordance with the present invention;
Fig. 2 is a perspective view of the outer end portion of a box beam type outer boom and an extension boom telescopically movable therein, said extension boom being of modified I-section ~, - 3a -in order to permit placing the hydraulic lines, in conformity with a preferred embodiment of the invention, in protective channels defined by the flanges of the I-section;
Fig. 3 is a modification of Fig. 2, and Fig. 4 is an embodiment of the invention which is a combination of the embodiments in Figs. 1 and 2 and is applied to a boom system in which the telescopically extendable boom com-prises two relatively telescoping boom sections.
In the embodiment of Fig. 1 the outer boom 1 of a loading apparatus of prior-art design, is shown by way of example. The loading apparatus includes in addition to the outer boom a first boom section (not shown) to which the outer boom is pivoted. The outer boom 1 is in the form of a box beam, and an extension boom is movably arranged in the outer boom.
In a loading apparatus of the kind indicated the extension boom ls usually termed telescopic boom and is adapted to carry at its front end (at 3) a loading implement (not shown) operated by hydraulic cylinders. The telescopic boom 2 is movable in the outer boom 1 by means of a hydraulic cylinder 4 whose piston rod 5 in the embodiment illustrated is rearwardly directed for a reason that will appear from the following.
The hydraulic connection to the hydraulic cylinder 4 is provided in a conventional manner, which is not, however, illustrated and neither described since the invention is di-rected to the problem of running the lines to the operating cylinders of the loading implement, which in the embodiment illustrated are assumed to require four hydraulic lines 6.
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~76068 For the sake of simplicity only one of these four lines is shown in Fig. 1.
The most usual way of arranging the hydrauli-c connections with the loading implement is to use hoses which extend from a point midway between the two ends of the outer boom in large depending bights to a fastening at the front end of the tele-scopic boom. The hose bights must be of a sufficiently long length to allow maximum extension of the telescopic boom without using a stretching tension in the hydraulic hoses.
These depending hose bights which can be found in most, for instance,vehicle-mounted booms of the type herein contemplated are very vulnerable and very cumbersome to the operation of the booms, for example in forest land.
According to the invention, however, each hydraulic hose 6 is laid in a single loop within the outer and tele-scopic booms, and the arrangement is such that the bight forma-tion and the hose movement take place in a predetermined manner.
As illustrated in Fig. 1, the hose 6 extends in a long loop into the open front end of the teiescopic boom 2, through said telescopic boom and from said boom into the outer boom 1 where the hose forms a C-shaped bight. From this bight the hose extends in a direction back towards the front end of the telescopic boom in a space 7 between the adjoining lower walls 8, 9 of the outer and telescopic booms, protruding through an opening 10 in the wall 8 of the outer boom. From the opening 10 the hose can extend along the outer boom to-wards the rear end thereof, for instance through a protective ..
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pipe (not shown~ fixed to the underside of said outer boom.
In Fiq, 1 the hose bight portions located in the booms are designated 6a, 6c and the bight proper is designated 6b, while the hose portion extracted through the opening 10 in the outer boom is designated 6d. To provide the space 7 between the telescopic boom and the outer boom the telescopic boom is carried at a distance from the lower wall 8 of the outer boom by means of a pair of sliding and supporting bearings (alternatively rollers) 11 in the front end portion of the outer boom in a manner that will appear from Fig. 1. The opening 10 is provided near the rear one of said bearings 11.
The hose 6 extends about the cylinder 4 in the longitudinal direction thereof, the hose bight 6b being placed laterally of the piston rod 5. With four hoses 6, two hose bights 6b should be placed on one side of the piston rod 5 and the other two hose bights on the other side of the piston rod.
To provide as ample a room as possible for these hose bights, that is laterally of the piston rod, the cylinder is placed in an entirely reversed position relative to its normal posi-tion.
- The configuration of each hose bight 6b is detenmined by the room available for the loop run portions closest to the bight between the upper wall 12 of the telescopic boom 2 and the lower wall 8 of the outer boom 1. When the telescopic boom
2 is extended the cylinder 4 takes part in the movement of said telescopic boom. Also the hose bight 6b takes part in the movement of the telescopic boom but is only moved half , ..
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the distance , that is the distance between the bight 6b and the rear end 2a of the telescopic boom 2 increases when the telescopic boom is extended, simultaneously as the bight 6b (under rolling movement of the hose) is moved to the right in Fig. 1. When the telescopic boom is wholly extended the bight 6b lies in a more free position in the outer boom 1 between the lower and upper walls 7 and 14 thereof. In this position, the elastic hose bight 6_ may have a slightly greater radius but still has substantially the same configuration. Upon retraction of the telescopic arm the inner end portion 14' of the upper wall 14 of the telescopic boom slides along the uppper run -6a of the hose back to the posi-tion shown in Fig. 1. If desired, said wall portion 14' can be formed or provided with a smooth surface which reduces the wear of the hose.
It should be observed that the hoses 6 can be fixed in the telescopic boom 2 along the outer portions of the loop .
runs 6a, 6b which are not involved in the rolling movement of the hoses at the shifting of the hose bights 6b when the telescopic boom 2 is being extended to the maximum extent.
If desired, guides may be provided on the inner side of the wall 12 of the telescopic boom and on the outer side of the opposite wall 9, but this normally is not necessary since the piston rod 5 and the side walls of the outer boom 1 pro-vide a sufficient lateral guiding of the hose bights 6b. Fig. 1 shows at 13 a device for keeping the cylinder 4 centred at the rear end relative to the telescopic boom 2, and this .. ~. .: , .
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~076068 device can be exploited for guiding the upper run 6a of the hose 6.
Fig. 2 shows a preferred embodiment of the inven-tion in which the outer boom 1 as in Fig. 1 is in the form of a box beam, while the telescopic boom 2a is in the form of a beam of modified I-section, more paticularly 5~-section, that is the web of the I-section is in the form of a box beam 15 having spaced parallel side walls 16, 17 and upper and lower walls 1~, 19 which on either side of the box beam section 15 have laterally protruding flanges 18a, l9a whose edge portions 18b, l9b are directed towards the horizontal centre plane of the telescopic boom. The side walls 16, 17 and the flanges 18a, l9a and their bent edge portions 18b, l9b thus on either side of the box beam section 15 form a laterally outwardly open channel 20 which is closed by the adjoining side wall 21 of the outer boom 1 in that portion of the telescopic boom 2a which is located within the outer boom 1.
The hydraulic lines 6 coming from the loading implement (not shown), which are say four in number and are flexible hoses, are placed in pairs in the two channels 20 and preferably rest against the lower flanges l9a. Each hose 6 forms like in Fig. 1 a loop which, however, extends rearwardly along the channel 20 and forms a bight 6b in the channel within the outer boom 1, that is in the space between the channel 20 and the adjoining outer boom wall 21. From the bight 6b each hose 6 extends forwardly and is drawn outwardly through the outer boom wall 21 in an area between the flange edges '' ', ' ~'~" ' ', ', : : .
18b, l9b, as will be clearly seen from Fig~ 2 where the outer portions of the hoses are designated 6d. From there the hoses extend rearwardly (not illustrated) along the outer boom 1 either in protective pipes or externally located. The con-figuration and size of the flexible, but relatively rigid hose bights 6b are determined by the distance between the flanges 18a, l9a of the telescopic boom 2a and are practically constant during the shifting of the bights when the telescopic boom is being operated. When the telescopic boom 2a is extended to its maximum extent the hose bights 6b can still be located entirely within the channel 20.
Also in the embodiment shown in Fig. 2 the telescopic boom 2a is movable by means of a hydraulic cylinder which in this instance is placed in the outer boom 1 and penetrates into the box beam section 15 of the telescopic boom 2a, in which case the piston rod can be directed forwardly. Said cylinder is not, however, illustrated in Fig. 2.
The portions of the hoses which need not be movable relative to the telescopic boom 2a can be fixed by means of clamps 22 in the channels 20, for instance in the manner that will appear from Fig. 2.
Fig~ 3 illustrates an embodiment which differs from that in Fig. 2 only by the fact that the hydraulic hose lines 6 extend from outside into the space between the channels 20 and the side walls 21 of the outer boom 1, in which space the hoses form bights 6b.
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,' In the embodiment shown in Fig. 4 the telescopic boom comprises two relatively movable boom sections 2a, 2b of which one boom section 2a corresponds to the telescopic boom 2a in Fig. 2 while the other inner boom section 2b corresponds to the telescopic boom 2 in Fig. l,The hydraulic hoses 6_ are arranged according to a combination of Fig. 1 and Fig. 2, that is the hydraulic hoses 6 in the inner extension boom 2b are arranged in bights according to Fig. 1, passed out-wardly through the side wall of the outer telescopic boom section 2a to the respective channel 20 and extend along the channel inwardly of the outer boom 1 where they form bights 6b in the space defined by the channel and the side wall 21 of the outer boom 1, the hydraulic lines being drawn outwardly through the side wall 21, as shown at 6d.
As compared with the embodiment illustrated in Fig. 1 the embodiment of Fig. 2 provides the further great advantage that the telescopic boom section by reason of its side flanges ensuresa very satisfactory protection of the hydraulic lines and adequately guides the bight formation .
of the hoses simultaneously as the channel-shaped flanges in combination with the central box beam profile confer a very great resistance to the telescopic boom - considering its relatively lightweight construction - to all cases of loading since the section as a whole has its bending and torsion-rigidifying wall material placed in an optimum manner simultaneously as the hollow space in the central box beam profile provides room for a hydraulic cylinder for the operation ..
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of the telescopic boom; this hydraulic cylinder cannot ever come in contact with the hoses.
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the distance , that is the distance between the bight 6b and the rear end 2a of the telescopic boom 2 increases when the telescopic boom is extended, simultaneously as the bight 6b (under rolling movement of the hose) is moved to the right in Fig. 1. When the telescopic boom is wholly extended the bight 6b lies in a more free position in the outer boom 1 between the lower and upper walls 7 and 14 thereof. In this position, the elastic hose bight 6_ may have a slightly greater radius but still has substantially the same configuration. Upon retraction of the telescopic arm the inner end portion 14' of the upper wall 14 of the telescopic boom slides along the uppper run -6a of the hose back to the posi-tion shown in Fig. 1. If desired, said wall portion 14' can be formed or provided with a smooth surface which reduces the wear of the hose.
It should be observed that the hoses 6 can be fixed in the telescopic boom 2 along the outer portions of the loop .
runs 6a, 6b which are not involved in the rolling movement of the hoses at the shifting of the hose bights 6b when the telescopic boom 2 is being extended to the maximum extent.
If desired, guides may be provided on the inner side of the wall 12 of the telescopic boom and on the outer side of the opposite wall 9, but this normally is not necessary since the piston rod 5 and the side walls of the outer boom 1 pro-vide a sufficient lateral guiding of the hose bights 6b. Fig. 1 shows at 13 a device for keeping the cylinder 4 centred at the rear end relative to the telescopic boom 2, and this .. ~. .: , .
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~076068 device can be exploited for guiding the upper run 6a of the hose 6.
Fig. 2 shows a preferred embodiment of the inven-tion in which the outer boom 1 as in Fig. 1 is in the form of a box beam, while the telescopic boom 2a is in the form of a beam of modified I-section, more paticularly 5~-section, that is the web of the I-section is in the form of a box beam 15 having spaced parallel side walls 16, 17 and upper and lower walls 1~, 19 which on either side of the box beam section 15 have laterally protruding flanges 18a, l9a whose edge portions 18b, l9b are directed towards the horizontal centre plane of the telescopic boom. The side walls 16, 17 and the flanges 18a, l9a and their bent edge portions 18b, l9b thus on either side of the box beam section 15 form a laterally outwardly open channel 20 which is closed by the adjoining side wall 21 of the outer boom 1 in that portion of the telescopic boom 2a which is located within the outer boom 1.
The hydraulic lines 6 coming from the loading implement (not shown), which are say four in number and are flexible hoses, are placed in pairs in the two channels 20 and preferably rest against the lower flanges l9a. Each hose 6 forms like in Fig. 1 a loop which, however, extends rearwardly along the channel 20 and forms a bight 6b in the channel within the outer boom 1, that is in the space between the channel 20 and the adjoining outer boom wall 21. From the bight 6b each hose 6 extends forwardly and is drawn outwardly through the outer boom wall 21 in an area between the flange edges '' ', ' ~'~" ' ', ', : : .
18b, l9b, as will be clearly seen from Fig~ 2 where the outer portions of the hoses are designated 6d. From there the hoses extend rearwardly (not illustrated) along the outer boom 1 either in protective pipes or externally located. The con-figuration and size of the flexible, but relatively rigid hose bights 6b are determined by the distance between the flanges 18a, l9a of the telescopic boom 2a and are practically constant during the shifting of the bights when the telescopic boom is being operated. When the telescopic boom 2a is extended to its maximum extent the hose bights 6b can still be located entirely within the channel 20.
Also in the embodiment shown in Fig. 2 the telescopic boom 2a is movable by means of a hydraulic cylinder which in this instance is placed in the outer boom 1 and penetrates into the box beam section 15 of the telescopic boom 2a, in which case the piston rod can be directed forwardly. Said cylinder is not, however, illustrated in Fig. 2.
The portions of the hoses which need not be movable relative to the telescopic boom 2a can be fixed by means of clamps 22 in the channels 20, for instance in the manner that will appear from Fig. 2.
Fig~ 3 illustrates an embodiment which differs from that in Fig. 2 only by the fact that the hydraulic hose lines 6 extend from outside into the space between the channels 20 and the side walls 21 of the outer boom 1, in which space the hoses form bights 6b.
. - ,:
' ' ~:' ,"'^`~
,' In the embodiment shown in Fig. 4 the telescopic boom comprises two relatively movable boom sections 2a, 2b of which one boom section 2a corresponds to the telescopic boom 2a in Fig. 2 while the other inner boom section 2b corresponds to the telescopic boom 2 in Fig. l,The hydraulic hoses 6_ are arranged according to a combination of Fig. 1 and Fig. 2, that is the hydraulic hoses 6 in the inner extension boom 2b are arranged in bights according to Fig. 1, passed out-wardly through the side wall of the outer telescopic boom section 2a to the respective channel 20 and extend along the channel inwardly of the outer boom 1 where they form bights 6b in the space defined by the channel and the side wall 21 of the outer boom 1, the hydraulic lines being drawn outwardly through the side wall 21, as shown at 6d.
As compared with the embodiment illustrated in Fig. 1 the embodiment of Fig. 2 provides the further great advantage that the telescopic boom section by reason of its side flanges ensuresa very satisfactory protection of the hydraulic lines and adequately guides the bight formation .
of the hoses simultaneously as the channel-shaped flanges in combination with the central box beam profile confer a very great resistance to the telescopic boom - considering its relatively lightweight construction - to all cases of loading since the section as a whole has its bending and torsion-rigidifying wall material placed in an optimum manner simultaneously as the hollow space in the central box beam profile provides room for a hydraulic cylinder for the operation ..
~: ` ';
of the telescopic boom; this hydraulic cylinder cannot ever come in contact with the hoses.
Claims (7)
1. A telescopically extensible boom loading apparatus comprising an outer hollow boom section, an inner boom section in telescopic relationship in said boom, and at least one flexible hydraulic hose extending with a flexible section from said outer hollow boom section to said inner telescopic boom section, said flexible hose being of sufficient length to permit maximum extension of the inner telescopic boom section in relation to the outer boom section and forming a loop having a pair of opposite legs and a substantially C-shaped bight extending from and connecting each of said legs to the other, and further extending in a longitudinal direction in said telescopically extensible boom, one of said loop legs being shortened and the other lengthened, and vice versa, and the C-bight being moved longitudinally in the boom when the boom sections are extended and retracted, wherein said inner boom section comprises a longitudinal web and at least one protruding flange forming a guide and spacer means for guiding the inner boom section in the outer hollow boom section with the web of the inner boom section in spaced relation to at least one inner side of the outer boom section, the said inner side of the hollow outer boom section and said web and flange of the inner boom section forming, when the inner boom section is retracted in the outer boom section, an open ended channel; and wherein said loop with its C-bight are housed in said channel between the said inner side of said outer boom section and the said web of the inner boom section with one of the legs of said loop of the flexible hose being seated on the protruding flange.
2. A loading apparatus as claimed in claim 1, wherein the inner boom section is in the form of a box beam profile with protruding flanges which define on the outer side of each of two of the four sides of the box beam profile pair-wise an outwardly opened channel which in the part of the inner boom section which is situated in the outer boom section is closed by an adjoining wall of said inner boom section, and wherein the hydraulic hose loop is arranged in said channel and extends rearwardly into the space closed by said channel and said wall of said outer boom section.
3. A loading apparatus as claimed in claim 2, wherein the inner side of one of said flanges, that is one side wall of the channel, forms a supporting surface for one part of the hydraulic hose loop, which part extends to the outer end of said inner boom section, and wherein the inner side of the other flange forms a supporting surface for at least that portion of the other part of the loop which is situated closest to the C-bight of the loop.
4. A loading apparatus as claimed in claim 2, wherein said inner boom section of box profile is rectangular along at least the major portion of its length and the two flanges are formed on opposite walls by longitudinal edge portions protruding from the other two opposite walls, said edge portions forming at the opposite long sides of said inner boom section together with the other two long wall channels which are substantially of U-shaped section, and the outer edge portions of the flanges being on each side bent in-wardly towards one another so that the U-section resembles a C-section.
5. A loading apparatus as claimed in claim 4, wherein said opposite wall surfaces are the opposite inner sides of a box beam profile portion of said outer boom and said inner boom section.
6. A loading apparatus as claimed in claim 5, wherein a hydraulic cylinder for moving said inner boom section in relation to the outer boom section is placed within the inner boom section with the piston rod extending rearwardly within said outer boom section, and wherein the hydraulic hose bight is arranged in a space between the piston rod and the inner side of an adjoining wall of said inner boom section and said outer boom section,
7. A loading apparatus as claimed in claim 6, wherein the hydraulic hose loop has its one part arranged on the inner side of a bottom wall of said outer boom section and wherein the inner boom section is guided in said outer boom section so that one side of said inner boom section and said inner side of said outer boom section define a space in the area of said one hydraulic hose part when the inner boom section is retracted into said outer boom section.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7607203A SE402003C (en) | 1976-06-23 | 1976-06-23 | DEVICE FOR LOADING DEVICES WITH TELESCOPICALLY EXTENDABLE CRANE ARM AND WITH HYDRAULIC CABLES BORN BY THE CRANE ARM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1076068A true CA1076068A (en) | 1980-04-22 |
Family
ID=20328296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA281,112A Expired CA1076068A (en) | 1976-06-23 | 1977-06-22 | Loading apparatus with extension boom (telescopic boom) and with hydraulic lines carried by the boom |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE855281A (en) |
| CA (1) | CA1076068A (en) |
| CH (1) | CH619428A5 (en) |
| DE (1) | DE2721636A1 (en) |
| FI (1) | FI65054C (en) |
| FR (1) | FR2355767A1 (en) |
| SE (1) | SE402003C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8702053L (en) * | 1987-05-19 | 1988-11-20 | Tico Ab | SLANGFOERINGSANORDNING |
| DE9102552U1 (en) * | 1991-02-11 | 1992-03-26 | Liebherr-Werk Ehingen Gmbh, 7930 Ehingen | Telescopic boom for mobile cranes or similar |
| DE19613700A1 (en) * | 1996-03-29 | 1997-10-02 | M E P Gmbh Ges Fuer Consulting | Telescopically interlocking machine part, e.g. for excavator or crane |
| AT409485B (en) * | 1999-05-18 | 2002-08-26 | Winter Udo Ing Mag | TELESCOPIC BOOM FOR A VEHICLE OR A LIFT |
| DE10218275B4 (en) * | 2002-04-18 | 2010-04-08 | J. Schmalz Gmbh | Vacuum handling device |
| AU2006343802A1 (en) | 2006-05-15 | 2007-11-22 | Valio Ltd | New use of therapeutically useful peptides |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1208970B (en) * | 1962-07-05 | 1966-01-13 | Hydrauliska Ind Aktiebolaget | Device for guiding flexible pressure medium lines on cranes with swiveling lifting arm |
| US3623501A (en) * | 1970-07-13 | 1971-11-30 | Chance Co Ab | Continuous hydraulic hose structure for telescopic boom assembly |
| US3666125A (en) * | 1970-09-10 | 1972-05-30 | Warner Swasey Co | Boom assembly |
| US3804262A (en) * | 1972-09-18 | 1974-04-16 | Harnischfeger Corp | Telescopic boom |
| DE2352761A1 (en) * | 1973-10-20 | 1975-04-30 | Hans Demleitner | Tensioning device for hydraulic hose on extending crane arm - has rod fastened at one end to arm and two pulleys at other end |
| US3893480A (en) * | 1973-12-26 | 1975-07-08 | Glenn G Dunbar | Hydraulic line assembly |
| FR2279011A1 (en) * | 1975-02-24 | 1976-02-13 | Poclain Sa | Hydraulic fluid supply along telescopic arms - with internal U shaped flexible connector guided by channel sections |
-
1976
- 1976-06-23 SE SE7607203A patent/SE402003C/en unknown
-
1977
- 1977-05-12 CH CH593377A patent/CH619428A5/en not_active IP Right Cessation
- 1977-05-13 DE DE19772721636 patent/DE2721636A1/en active Granted
- 1977-06-01 BE BE178100A patent/BE855281A/en not_active IP Right Cessation
- 1977-06-22 CA CA281,112A patent/CA1076068A/en not_active Expired
- 1977-06-22 FR FR7719111A patent/FR2355767A1/en active Granted
- 1977-06-23 FI FI771975A patent/FI65054C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE402003C (en) | 1982-02-22 |
| FI65054C (en) | 1988-03-18 |
| DE2721636A1 (en) | 1977-12-29 |
| SE7607203L (en) | 1977-12-24 |
| FR2355767B1 (en) | 1984-03-09 |
| DE2721636C2 (en) | 1987-07-02 |
| CH619428A5 (en) | 1980-09-30 |
| SE402003B (en) | 1978-06-12 |
| FI65054B (en) | 1983-11-30 |
| FI771975A (en) | 1977-12-24 |
| BE855281A (en) | 1977-10-03 |
| FR2355767A1 (en) | 1978-01-20 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |