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Publication numberUS3666125 A
Publication typeGrant
Publication dateMay 30, 1972
Filing dateSep 10, 1970
Priority dateSep 10, 1970
Also published asCA945118A, CA945118A1, DE2141424A1
Publication numberUS 3666125 A, US 3666125A, US-A-3666125, US3666125 A, US3666125A
InventorsGano John W, Schlafly Paul W
Original AssigneeWarner Swasey Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Boom assembly
US 3666125 A
Abstract
An extendable boom assembly includes a plurality of longitudinally extending guide walls which define channels for receiving loops or bends in flexible conduits. Upon extension of the boom assembly, the loops move outwardly along the channels into engagement with rollers of a biasing assembly. The biasing assembly tensions the flexible conduits during continued extension of the boom assembly. The biasing assembly also initiates inward movement of the loops along the channels in a predetermined manner when the boom assembly is retracted. Structural frame members of the boom assembly are connected with the flexible conduits and conduct fluid under pressure from the flexible conduits to a device mounted on an outer end portion of the boom assembly.
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I United States Patent 1 3,666,125 Gano et al. 1 May 30, 1972 [5 BOOM ASSEMBLY 3,214,033 10/1965 Nilsson ..214/010. 11 [72] Inventors: :Zf i g g Schlafly both of Primary Examiner-Robert G. Sheridan ew la ep 10 Assistant Examiner.lerold M. Forsberg [73] Assignee: The Warner & Swasey Company, Cleve- Attorney-hunt and li land, Ohio [57] ABSTRACT [22] Filed: Sept. 10, 1970 Appl. No.: 70,954

An extendable boom assembly includes a plurality of longitudinally extending guide walls which define channels for receiving loops or bends in flexible conduits. Upon extension of the boom assembly, the loops move outwardly along the channels into engagement with rollers of a biasing assembly. The biasing assembly tensions the flexible conduits during continued extension of the boom assembly. The biasing assembly also initiates inward movement of the loops along the channels in a predetermined manner when the boom assembly is retracted. Structural frame members of the boom assembly are connected with the flexible conduits and conduct fluid under pressure from the flexible conduits to a device mounted on an outer end portion of the boom assembly.

16 Claims, 9 Drawing Figures PATENIEDMMO I972 668, l 25 sum 10F 3 PAUL W/L/AM \SCHZAFLY JOHN W GA/VO ATTORNEYS PATENTEDMAY 30 I972 SHEET 2 BF 3 JOf/A/ W GANG BOOM ASSEMBLY This invention relates generally to an extendable boom assembly, and more particularly, to a new and improved system for supplying power to an apparatus mounted on the boom assembly.

A known boom assembly includes inner and outer boom sections which are mounted in a telescopic relationship with each other. Relatively long, flexible hoses are utilized to supply fluid under pressure to an apparatus for operating a tool on the outer section of the boom assembly. When the boom assembly is extended and retracted, these long hoses may be flexed or moved sidewardly so that they rub against the sections of the boom assembly and become worn or abraded. In fact, the flexible hoses may move to such an extent relative to the boom sections that they are kinked or pinched between the boom sections.

Of course, the operating life of the flexible hoses is decreased by any abrading, kinking or pinching of the hoses which may occur as the boom assembly is extended or retracted. Replacement of these hoses can be a relatively difficult and time consuming task. The difficulty encountered in replacing the hoses is increased if the hoses are located within the sections of the boom assembly where they are protected against engagement with external objects.

Accordingly, it is an object of this invention to provide a new and improved boom assembly wherein flexible conduits for conducting power between movable sections of the boom assembly are protected by a guide arrangement which maintains the flexible conduits in a predetermined relationship with the sections of the boom assembly as it is extended and retracted.

Another object of this invention is to provide a new and improved boom assembly which includes a guide arrangement for guiding movement of a flexible loop formed in a conduit along a predetermined path and a biasing means for applying a biasing force to the loop as it is moved along at least a portion of this path during relative movement between sections of the boom assembly.

Another object of this invention is to provide a new and improved boom assembly which includes a plurality of sections which are movable relative to each other, an apparatus mounted on one of the boom sections being supplied with energy conducted through a flexible conduit having a loop formed therein in such a manner that the loop is displaced along the flexible conduit upon relative movement between the boom section, and wherein the loop moves along a channel formed by a guide arrangement as the boom sections are moved relative to each other, the loop being engaged by a biasing assembly to tension the flexible conduit and to urge the loop in a predetermined direction along the channel during at least a portion of the relative movement between the boom sections.

Another object of this invention is to provide a new and improved boom assembly having a pair of relatively movable sections with a conduit means for conducting energy to an apparatus on one of the sections, this conduit means includes a flexible portion having a loop formed therein between an outer leg which is connected with one of the boom sections and an inner leg which is connected with the other boom section and wherein the boom assembly includes a biasing means which is operable to tension at least the inner leg of the flexible conduit means to maintain it in a predetermined relationship relative to the boom sections when the inner leg is relatively long, this biasing means being ineffective to apply a force to the loop when the inner leg is relatively short.

Another object of the present invention is to provide a new and improved boom assembly having a section which is movable relative to a base and a fluid operated device which is supported on the boom section and is connected in fluid communication with a source of fluid on the base by a fluid conduit means and wherein this fluid conduit means includes a hollow structural member of the boom section.

These and other objects and features of the invention will become more apparent upon a consideration of the following description taken in connection with the accompanying drawings where:

FIG. 1 is a general illustration of a vehicle having a boom assembly constructed in accordance with the present invention;

FIG. 2 is a fragmentary elevational view depicting the relationship between inner and outer boom sections and a cradle or base for mounting these boom sections on the vehicle of FIG. 1;

FIG. 3 is a sectional view, taken generally along the line 3- 3 of FIG. 2, further illustrating the relationship between the inner and outer boom sections;

FIG. 4 is a sectional view, taken generally along the line 4- 4 of FIG. 2, illustrating the relationship between a hose trough for receiving flexible conduits and the boom sections;

FIG. 5 is a schematic sectional view, illustrating the relationship between one of the flexible conduits and the boom sections when the boom assembly of FIG. 1 is in a retracted condition;

FIG. 6 is a sectional view, generally similar to FIG. 5, illustrating the relationship between the flexible conduit and the boom sections when the boom assembly is partially extended and the flexible conduit is engaged by a biasing assembly;

FIG. 7 is a schematic sectional view, generally similar to FIG. 6, illustrating the boom assembly in an extended condition in which the biasing assembly applies a tensioning force to the flexible conduit;

FIG. 8 is a schematic illustration depicting the relationship between an apparatus for operating a tool and the inner boom section; and

FIG. 9 is an enlarged illustration of the hose trough of FIG. 4.

The present invention provides a new and improved boom assembly having a conduit positioning apparatus for maintaining flexible conduits in a predetermined relationship with telescopically disposed boom sections to prevent the flexible conduit from being abraded, kinked or pinched during relative movement between the boom sections. Although a boom assembly 10 constructed in accordance with the present invention can be used in many different environments, the boom assembly is illustrated in FIG. 1 in association with a vehicle 12. The vehicle 12 includes a rotatable platform 14 which supports the boom assembly 10 for rotational movement relative to a frame 16 of the vehicle.

When the vehicle 12 is being driven over-the-road to a work location, an operator drives the vehicle from a cab 20 mounted on a forward portion of the frame 16. Once the vehicle 12 has been driven to a work location, the operator controls the boom assembly 10 from an operators cab 22 on the rotatable platform 14. An engine 24 is mounted on the rotatable platform 14 and, in the illustrated embodiment of the invention, drives a pump (not shown) to provide hydraulic fluid under pressure to effect operation of the boom assembly 10.

The boom assembly 10 includes inner and outer sections 28 and 30 (see FIGS. 2 and 3) which are disposed in a telescopic relationship with each other. The outer boom section 30 is mounted on a cradle or sleeve member 34 which is pivotally connected at 36 (FIG. 2) with the platform 14 of the vehicle 12. The cradle or base 34 is pivoted relative to the platfonn 14 by extending and retracting a piston and cylinder assembly 40 to thereby enable work operations to be performed in the manner disclosed in US. Pat. No. 3,329,291 to Przybylski. Of course, other mounting arrangements could be utilized to mount the boom assembly 10 on a base other than the vehicle 12.

The boom assembly 10 is extended and retracted by effecting relative movement between the telescopically disposed inner and outer boom sections 28 and 30. Accordingly, a piston and cylinder assembly 38 (see FIGS. 5 through 7) is extendable to move the inner boom section 28 axially outwardly relative to the outer boom section 30 to thereby extend the boom assembly 10. Similarly, the piston and cylinder assembly 38 is retractable to move the inner boom section 28 inwardly from the extended position of FIG. 7 to the retracted position of FIG. 5. The inner boom section 28 is supported for this movement relative to the outer boom section 30 by inner rollers 42 which are rotatably mounted on the inner boom section 28 (FIG. 4) and are disposed in rolling engagement with longitudinally extending frame members 46 of the outer boom section 30. The inner boom section 28 is further supported by outer rollers 48 (FIG. 8) which are rotatably mounted on an outer end portion of the outer boom section 30 and are disposed in rolling engagement with tubular frame members 50 of the inner boom section.

The piston and cylinder assembly 38 is extended and retracted under the influence of hydraulic fluid supplied by a pump (not shown) driven by the motor 24. This fluid is conducted under pressure through conduits 54 mounted on the cradle 34 (FIG. 2) to a hollow piston rod 58 of the piston and cylinder assembly 38 (see FIGS. 4-7). The hydraulic fluid is then conducted to a cylinder 60 of the piston and cylinder assembly 38 to extend and retract the boom assembly 10 in a known manner.

' A suitable tool 64 is mounted on an outer end portion of the inner boom section 28 (see FIG. 8). A power apparatus or device 66 is mounted on the inner boom section 28 and is operable to efiect pivotal movement of the tool 64 about a connection 68. In the illustrated embodiment of the invention, the power device 66 includes a fluid motor or piston and cylinder assembly 70. The piston and cylinder assembly 70 is extended under the influence of high pressure hydraulic fluid to actuate a linkage 72 and pivot the tool 64 in a clockwise direction as viewed in FIG. 8. Similarly, the piston and cylinder assembly 70 is retracted to pivot the tool 64 in a counterclockwise direction. Although the power apparatus or device 66 is operated by hydraulic fluid under pressure, it is contemplated that high pressure air or other fluid could be utilized to operate other types of power devices associated with the tool 64. In fact, the power apparatus 66 could, if desired, include an electric motor for operating a too] similar to the tool 64.

Hydraulic fluid is conducted under pressure from a pump mounted on the platform 14 to the power apparatus 66 by a fluid conduit arrangement 74. The fluid conduit arrangement 74 includes a pair of conduits 76 which are mounted on the cradle 34 (see FIG. 2). The conduits 76 extend through opposite side portions of the cradle (see FIG. 3) to a hose trough 80 mounted on the cradle 34 and outer boom section 30 (one of the conduits 76 being shown in FIG. through 7). A pair of flexible conduits 84 and 86 (see FIGS. 4 and 9) are associated with the hose trough 80 and connect the conduits 76 on the outer boom section 30 in fluid communication with conduits on the inner boom section 28. The conduits on the inner boom section 28 include a pair of the hollow frame members 50 which conduct fluid to hoses 90 and 92 connected with the piston and cylinder assembly 66 (see FIG. 8).

The hoses 84 and 86 are flexible to enable fluid under pressure to be conducted between the relatively movable boom sections 28 and 30. Thus, the hose 84 (FIG. 5) includes a loop or bend 96 which connects an outer leg or section 98 of the hose in fluid communication with an inner leg 100 of the hose. The outer leg 98 of the hose 84 is connected to the outer boom section 30 while the inner leg 100 is connected with the inner boom section 28. Therefore, when the boom assembly is extended or retracted, the loop 96 moves along the flexible hose 84 at a speed which is approximately half the speed of relative movement between the boom sections 28 and 30.

When the boom assembly 10 is in the retracted condition shown in FIG. 5 the loop 96 is located adjacent to an inner end of the hose trough 80. At this time the outer leg 98 of the hose 84 is substantially longer than the inner leg 100 of the hose. As the boom assembly 10 is extended and the inner boom section 28 is moved outwardly relative to the outer boom section 30, the loop 96 moves outwardly along the hose trough 80 (FIG. 6). Of course this increases the length of the inner leg 100 of the hose 84 and decreases the length of the outer leg 98 of the hose. When the boom assembly 10 is fully extended (FIG. 7),

the loop 96 is disposed adjacent to an outer end of the hose trough and the inner leg of the hose 84 is much longer than the outer leg 98 of the hose.

Similarly, when the boom assembly 10 is retracted the loop 96 moves inwardly from the position shown in FIG. 7 to the position shown in FIG. 5. During this movement, the outer leg 98 of the hose 84 decreases in length as the length of the inner leg 100 of the hose decreases. While the movement of the loop 96 for only the hose 84 has been illustrated, it should be understood that a similar loop is provided in the hose 86 and that this loop moves in the same manner as does the loop 96.

If the hose 84 is unrestrained as the loop 96 moves along the hose trough 80, the hose would tend to whip or flex sidewardly during extension and retraction of the boom assembly 10. Any tendency for the hose 84 to whip or move sidewardly becomes accentuated when the inner leg 100 of the hose is relatively long. Whipping or sideward movement of the hose 84 tends to abrade the hose and could even result in the hose being kinked or pinched. When the hose 84 is abraded, pinched or kinked, its service life is greatly reduced so that the hose must be replaced at relatively frequent intervals. Of course, the hose 86 is subjected to operating conditions similar to those experienced by the hose 84 and will have a similar service life.

Replacement of the hoses 84 and 86 is particularly difficult since they are located between the inner and outer boom sections 28 and 30 and are relatively inaccessible. This relatively inaccessible location for the hoses 84 and 86 is advantageous since the hoses are protected against being snagged or otherwise damaged by engagement with external objects during operation of the boom assembly 10.

A flexible conduit positioning assembly 101 is provided in the hose trough 80 to position the hoses 84 and 86 relative to the boom sections 28 and 30 to prevent undue wearing of the hoses as the boom assembly 10 is extended and retracted. The positioning assembly 101 includes a guide arrangement 102 for positioning the loops in the hoses 84 and 86 as the loops move along the hose trough 80 and a biasing assembly 103 for tensioning the hoses. The guide arrangement 102 includes a plurality of longitudinally extending guide walls 104, 105, l 06, 107 and 108 (FIG. 9) which define channels 109, 110, 111 and 1 12 along which loops in flexible conduits associated with the hose trough 80 can move during relative movement between the boom sections 28 and 30. While only the hoses 84 and 86 have been shown in channels 1 10 and 111, it should be understood that conduits may be provided in the channels 109 and 112 to conduct fluid or electrical energy to associated devices.

The outer leg 98 of the hose 84 is disposed in the channel 1 10 between the guide walls and 106 and rests against an outer wall 116 of the hose trough 80. The loop 96 extends out of the channel 1 10 away from the outer leg 98 to the inner leg 100 of the hose 84. When the boom assembly 10 is extended, the loop 96 rolls along the channel from the position shown in FIG. 5 through the position shown in FIG. 6 to the position shown in FIG. 7. During this movement, rounded guides 120 on the inner portions of the walls 105 and 106 engage the sides of the loop 96. The guides 120 are spaced apart by a distance which is slightly greater than the external diameter of the hose 84 to prevent the loop 96 from whipping or moving transversely relative to the boom sections 28 and 30 as the loop moves along the channel 110 formed between the parallel guide walls 105 and 106. The guides have relatively smooth rounded surfaces which tend to minimize abrasion on the loop 96 as it rolls along the channel 1 10 during extension or retraction of the boom assembly 10. Of course, a loop similar to the loop 96 is formed in the hose 86 and this loop rolls along the channel 1 I 1 in the same manner as in which the loop 96 rolls along the channel 110 during extension and retraction of the boom assembly 10.

As the boom assembly 10 is extended from the retracted position of FIG. 5 toward the extended position of FIG. 7, the length of the inner leg 100 of the flexible conduit or hose 84 increases. As its length increases, the inner leg 100 would tend to whip or move sidewardly if it were unrestrained. In fact, upon initiation of retraction of the boom assembly 10, the leg 100 is so long that it might tend to cause the loop 96 to roll out of the channel 1 or to form a second loop in the hose.

The biasing assembly 103 is associated with the guide arrangement 102 to prevent the flexible conduits in the hose trough 80 from whipping or moving sidewardly relative to their associated channels when the inner legs of these flexible conduits are relatively long. The biasing assembly 103 tensions the conduit 84 so that the loop 96 moves or rolls along the channel 110 in a predetermined manner and is not whipped or moved out of the channel under the influence of the relatively long inner leg portion 100. The biasing assembly 103 includes a plurality of rollers 134 which are disposed in the hose trough 80 between the guide walls 104 to 108. One of the rollers 134 is disposed in the channel 1 10 and engages the loop 96 to thereby tension the hose 84 (see FIGS. 6 and 7). Similarly, a roller 134 is provided in the channel 1 11 to engage a loop in the hose 86.

The rollers 134 are mounted on a common axle 136 which extends through slots formed in the guide walls 104 to 108. These slots extend longitudinally along the guide walls 104 to 108 in a direction parallel to the longitudinal axes of the boom sections 28 and 30. The rollers 134 are pressed or urged against the loops in the conduits associated with the channels 109 to 112 under the influence of a pair of springs 142 and 144. The springs 142 and 144 are connected at their outer ends to the axle 136 (FIG. 9) and at their inner ends to an inner end of the boom section 30 (FIG. 5). The slots in the guide walls 104 to 108 support and direct movement of the axle 136 to maintain the rollers 134 in a desired relationship with the channels 109 to 112 as the boom assembly 10 is extended and retracted.

When the inner leg 100 of the loop 84 is relatively short, the stiffness or resistance of the hose 84 to sideward flexing is sufficient to maintain the hose in the channel 110. Therefore, the biasing assembly 103 can be rendered ineffective to tension the hose 84 when the length of the inner leg 100 is such that the loop 96 will continue to roll along the channel 110 independently of any tension in the hose. Accordingly, the slots in the guide walls 104 to 108 terminate near the midpoint of the hose trough 80 (see FIG. 5). Therefore, when the boom assembly 10 is partially retracted the axle 136 engages arcuate end or stop surfaces formed in the slots to limit inward movement of the rollers 134. The loop 96 then moves away from the associated roller 134 and continues to roll inwardly along the channel 110. Since the rollers 134 can not move throughout the entire length of the hose trough 80, the springs 142 and 144 are shorter, when the boom assembly 10 is retracted, than the length of the hose trough 80 and can be extended to a length which is almost the same as the length of the hose trough when the boom assembly 10 is extended. This enables the springs 142 and 144 to be located within the hose trough in a relatively compact arrangement in which the springs are protected against engagement with external ob- )ects.

When the boom assembly 10 is operated from the retracted condition of FIG. 5 toward the extended condition of FIG. 7, the loop 96 rolls along the channel 110 toward the associated roller 134 which is located between the parallel guide walls 105 and 106. When the boom assembly is extended somewhat more than half way, the loop 96 is brought into engagement with the roller 134. At this time, the biasing assembly 103 becomes effective to tension the hose 84. During continued outward movement of the inner boom section, the loop 96 rolls along the channel 110 against the influence of the springs 142 and 144. This results in a relatively long inner leg 100 of the hose 84 being maintained under tension so that the hose does not whip or deflect sidewardly even though the relatively long inner leg 100 of the hose is not disposed between guide walls similar to the guide walls 105 and 106 of the hose trough 80. Of course, the slots in the guide walls 104 to 108 could have a length other than the specific length provided in the illustrated embodiment of the invention.

Upon initial retraction of the boom assembly 10 from the position shown in FIG. 7 toward the position shown in FIG. 5, the roller 134 applies a biasing force to the loop 96 to initiate its movement inwardly along the channel 110 in a direction parallel to the longitudinal axis of the inner and outer boom sections 28 and 30. The loop 96 then continues to roll inwardly along the channel 1 10 between the guide walls 105 and 106 under the influence of this biasing force. Since the hose 84 is maintained under tension by the biasing assembly 103, the hose is not whipped or flexed sidewardly under the influence of the relatively long inner leg 100 of the hose.

As the boom assembly 10 is retracted, the length of the inner leg 100 of the hose 84 decreases and the length of the outer leg 98 increases. Since the outer leg 98 of the hose 84 is located between the guide walls and 106, the outer leg does not tend to produce a whipping or sideward movement of the loop 96. Therefore when the boom assembly 10 has been retracted to the position shown in FIG. 6, the biasing assembly 103 does not have to continue applying tension to the hose 84 to maintain the loop 96 in the channel 110. Accordingly, movement of the axle 136 along the channel is interrupted by engagement of the axle with stop surfaces defining the inner ends of the slots in the walls 104 to 108. Continued retraction of the boom assembly 10 results in the loop 96 rolling further inwardly along the channel 1 l0 and away from the associated roller 134 of the biasing assembly 103 (FIG. 5). Although the relationship of only the hose 84 to the biasing assembly 103 has been fully described herein, it should be understood that the hose 86 and any other conduits in the trough 80 also cooperate with the biasing assembly 103 in much the same manner.

The hose trough 80 provides a compact enclosure for both the biasing assembly 103 and the guide arrangement 102. The outer or bottom wall 116 of the hose trough 80 extends between end walls 138 and of the cradle 34 (FIGS. 2 and 5) and is connected to frame members 46 of the outer boom section 30 (FIG. 4). The guide walls 104 to 108 are connected at their outer ends to the bottom wall 116 of the hose trough 80 and extend parallel to each other and to the longitudinal axis of the boom sections 28 and 30 to define parallel longitudinally extending channels 109 to 112 for receiving flexible conduits, such as the hoses 84 and 86. It is contemplated that either air hoses or electrical cables will be located in the channels 109 and 112 to conduct power to associated apparatus which may be mounted on the outer end portion of the inner boom section 28. It should be noted that the guide walls 104 and 108 cooperate with the bottom wall 116 of the hose trough 80 to define a pair of longitudinally extending channels or chambers 158 and 160 for receiving the springs 142 and 144.

The conduit arrangement 74 for conducting hydraulic fluid to and from the piston and cylinder assembly 70 includes two of the tubular frame members 50 of the inner boom section 28. Thus, the flexible hose 84 is connected at 166 (see FIGS. 5 and 6) to the inner end portion of the inner boom section 28. The hollow frame member 50 conducts the hydraulic fluid from the hose connection 166 to a hose connection 170 (FIG. 8) connecting the conduit 90 to the outer end portion of the same tubular frame member 50. The conduit 90 then conducts the hydraulic fluid to the piston and cylinder assembly 70. The flexible hose 86 (see FIG. 9) is connected in a similar manner with the conduit 92 (FIG. 8) by an associated structural member 50 which is located on the opposite side of the inner boom section 28. In addition to being fluid conduits, the hollow frame members 50 are important structural components of the inner boom section 28 and are engaged by the rollers 48 (FIG. 8) to support the inner boom section for movement relative to the outer boom section 30. The hollow structural members 50 also provide support for the tool 64 and the piston and cylinder assembly 70. While hydraulic fluid is conducted through the hollow structural members 50 in the specific preferred embodiment of the invention illustrated herein, it should be understood that air or electrical cables could be located within the members 50.

in view of the foregoing description it can be seen that the boom assembly 10 includes inner and outer boom sections 28 and 30 which are disposed in a telescopic relationship with each other. The power activated apparatus 70 is mounted on the outer end portion of the inner boom section 28 to operate the tool 64. The conduit arrangement 74 is provided to conduct energy to the power activated apparatus 70. In the illustrated embodiment of the invention, the power activated apparatus 70 is a hydraulically actuated piston and cylinder assembly to which the conduit arrangement 74 conducts fluid under pressure. The conduit arrangement 74 includes flexible hoses or conduits 84 and 86 having loops formed therein which cooperate with guide channels 1 l and l 1 1 so that the loops in the flexible conduits 84 and 86 move either inwardly or outwardly along these channels in a direction parallel to the longitudinal axes of the boom sections 28 and 30 when the boom assembly is either extended or retracted. In addition, the biasing assembly 103 is provided to tension the flexible conduits 84 and 86 when the boom assembly is in a partially extended condition. This tensioning of the relatively long inner legs of the flexible conduits 84 and 86 promotes movement of the loops in the conduits along the guide channels 1 l0 and 1 12 in a predetermined manner.

Having described a specific preferred embodiment of the invention, the following is claimed:

1. An extendable and retractable boom assembly comprising a first boom section, a second boom section mounted in a telescopic relationship with said first boom section, said first and second boom sections being movable relative to each other to extend and retract said boom assembly, apparatus mounted on said second boom section for movement therewith relative to said first boom section, conduit means operatively connected with said first and second boom sections for conducting energy from a source of energy to said apparatus, guide means connected to said first boom section and at least partially defining therebetween a channel extending along said first boom section in a direction generally parallel to a direction of movement of said boom assembly when it is extended or retracted, said conduit means including a flexible portion having a loop formed therein with an outer leg of said flexible portion extending from one end of said loop and disposed within said channel and an inner leg of said flexible portion extending from another end of said loop and operatively connected with said inner boom section in such a manner that the lengths of said legs vary relative to each other and said loop moves along said flexible portion and along the channel upon relative movement between said first and second boom sections during extension or retraction of said boom assembly, and biasing means for applying a force to said loop to tension said flexible portion of said conduit means and to urge said loop to move in a predetermined direction along said channel upon relative movement between said first and second sections of said boom assembly.

2. A boom assembly as set forth in claim I wherein said biasing means includes roller means disposed within said channel for engaging said loop and spring means operatively connected to said roller means for urging said roller means in the predetermined direction.

3. A boom assembly as set forth in claim 2 further including stop means for arresting movement of said roller means in the predetermined direction when said loop is in a predetermined position within said channel.

4. A boom assembly as set forth in claim 3 wherein said channel extends in the predetermined direction past said stop means and said loop is movable along said channel past said stop means and out of engagement with said roller means upon continued relative movement between said first and second boom sections.

5. A boom assembly as set forth in claim 1 wherein said second boom section includes a frame means for supporting said apparatus, said frame means including a hollow member which forms part of said conduit means, said flexible portion of said conduit means and said apparatus being connected in fluid communication with said hollow member whereby fluid under pressure conducted by said conduit means from the source of energy can flow from said flexible portion of said conduit means through said hollow member in said frame means to said apparatus.

6. A boom assembly as set forth in claim 5 further including roller means mounted on said first boom section for at least partially supporting said second boom section for movement relative to said first boom section, said roller means including a roller rotatably mounted on said first boom section and disposed in rolling engagement with said hollow member.

7. A boom assembly as set forth in claim 1 wherein said guide means includes a pair of spaced apart side walls with said channel being formed therebetween and a base wall extending between said side walls, said outer leg of said flexible portion of said fluid conduit means being disposed in abutting engagement with said base wall immediately adjacent to said loop.

8. A boom assembly as set forth in claim 7 wherein said biasing means includes a roller for engaging said loop, said roller being rotatably mounted on a support member extending between and movable along said side walls.

9. A boom assembly as set forth in claim I wherein said loop is movable into and out of engagement with said biasing means as said loop moves along said channel during extension and retraction of said boom assembly.

10. An extendable and retractable boom assembly comprising a first boom section, a second boom section mounted in a telescopic relationship with said first boom section, said first and second boom sections being movable relative to each other to extend and retract said boom assembly, apparatus mounted on said second boom section for movement therewith relative to said first boom section, conduit means operatively connected with said first and second boom sections for conducting energy from a source of energy to said apparatus, said conduit means including a flexible portion having a loo formed therein with an outer leg of said flexible portion extending from one end of said loop and operatively connected with said first boom section and an inner leg of said flexible portion extending from another end of said loop and operatively connected with said inner boom section in such a manner that the lengths of said legs vary relative to each other and said loop moves along said flexible portion between a first position in which said outer leg is relatively long and said inner leg is relatively short and a second position in which said outer leg is relatively short and said inner leg is relatively long upon relative movement between said first and second boom sections during extension or retraction of said boom assembly, biasing means for applying a force to said loop when said loop is in said second position and said inner leg is relatively long to tension said inner leg and maintain said flexible portion of said conduit means in a desired relationship with said first and second boom sections, means for rendering said biasing means ineffective to apply a force to said loop when said loop is in said first position and said inner leg is relatively short, and guides means for positioning said loop and said outer leg of said flexible portion of said conduit means in a predetermined relationship with said first boom section when said loop is in said first position.

11. A boom assembly as set forth in claim 10 wherein said biasing means includes a roller for engaging said loop and spring means for urging said roller and said loop toward said first position when said loop is in said second position, and said means for rendering said biasing means ineffective including stop means for effecting disengagement of said roller fr om said loop when said loop is intermediate said first and second positions.

12. A boom assembly as set forth in claim 10 wherein said first boom section includes means for defining a chamber, said outer leg of said flexible portion of said conduit means and said biasing means being located within said chamber outwardly of said second boom section, said loop extending inwardly from said chamber to said inner leg which is connected to said second boom section at a location inwardly of said chamber and said first boom section.

13. A boom assembly as set forth in claim wherein said guide means includes a pair of parallel walls which extend Iongitudinally along said first boom section and guide the movement of said loop as said loop moves between said first and second positions.

14. An extendable and retractable boom assembly for carrying an external load, said boom assembly comprising a base, a movable boom section operatively connected with said base and including a longitudinally extending and load carrying structural member which is hollow, roller means operatively connected with said base and having a peripheral surface disposed in rolling engagement with said hollow structural member to at least partially support said boom section for movement between a retracted position and an extended position, a fluid operated device mounted on an outer end portion of said boom section, and conduit means for connecting said fluid operated device in fluid communication with a source of fluid under pressure, said fluid conduit means including said hollow structural member and means for connecting the interior of said hollow structural member in fluid communication with said source of fluid under pressure and means for connecting the interior of said hollow structural member in fluid communication with said fluid operated device to enable fluid to flow from said source of fluid through said hollow structural member to said fluid operated device, said means for connecting the interior of said hollow structural member in fluid communication with said source of fluid under pressure including a flexible conduit a first end portion of which is connected with said boom section and a second end portion of which is connected with said source of fluid, said flexible fluid conduit having a loop formed therein intermediate said first and second end portions so that the lengths of said first and second end portions vary relative to each other and said loop moves along said flexible conduit upon movement of said boom section during extension and retraction of said boom assembly.

15. A boom assembly as set forth in claim 14 further including biasing means for engaging said loop and applying a force thereto to tension said flexible conduit and urge said loop in a predetermined direction upon movement of said boom section.

16. An extendable and retractable boom assembly comprising a first boom section, a second boom section mounted in a telescopic relationship with said first boom section, said first and second boom sections being movable relative to each other to extend and retract said boom assembly, apparatus mounted on said second boom section for movement therewith relative to said first boom section, conduit means operatively connected with said first and second boom sections for conducting energy from a source of energy to said apparatus, said conduit means including a flexible portion having a loop formed therein with an outer leg of said flexible portion extending from one end of said loop and operatively connected with said first boom section and an inner leg of said flexible portion extending from another end of said loop and operatively connected with said inner boom section in such a manner that the lengths of said legs vary relative to each other and said loop moves along said flexible portion between a first position in which said outer leg is relatively short and a second position in which said outer leg is relatively short and said inner leg is relatively long upon relative movement between said first and second boom sections during extension or retraction of said boom assembly, biasing means for applying a force to said loop when said loop is in said second position and said inner leg is relatively long to tension said inner leg and maintain said flexible portion of said conduit means in a desired relationship with said first and second boom sections, said biasing means including a roller for engaging said loop and spring means for urging said roller and said loop toward said first position when said loop is in said second position, and means for rendering said biasing means ineffective to apply a force to said loop when said loop is in said first position and said inner leg is relatively short, said means for rendering said biasing means ineffective including stop means for effecting disengagement of said roller from said loop when said loop is intermediate said first and second positions.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3777629 *Sep 18, 1972Dec 11, 1973Harnischfeger CorpHydraulic cylinder for telescopic boom
US3804262 *Sep 18, 1972Apr 16, 1974Harnischfeger CorpTelescopic boom
US3960285 *Oct 4, 1974Jun 1, 1976The Warner & Swasey CompanyMaterial handling apparatus
US4255076 *Jun 22, 1977Mar 10, 1981Jonsereds AbLoading apparatus with extension boom (telescopic boom) and with hydraulic lines carried by the boom
US4318451 *May 27, 1980Mar 9, 1982The Warner & Swasey CompanyDual function remote steering control
US4395192 *Jan 19, 1981Jul 26, 1983The Warner & Swasey CompanyBoom cylinder
US4534697 *Jun 13, 1983Aug 13, 1985Allibert S.A.Transfer device for robots
US4705450 *Dec 11, 1985Nov 10, 1987The Gradall CompanySingle engine excavator with remote control
US4728249 *Dec 11, 1985Mar 1, 1988The Gradall CompanyTelescoping boom assembly with longitudinally displaceable base boom section
US6308441Dec 15, 1998Oct 30, 2001The Gradall CompanyExcavator
US7360662 *Nov 29, 2004Apr 22, 2008Cnh America LlcTelescopic boom arm
US8070411 *May 30, 2008Dec 6, 2011Miller Industries Towing Equipment IncLow center of gravity carrier
US8348586 *Nov 5, 2009Jan 8, 2013Miller Industries Towing Equipment IncLow center of gravity carrier
US8376683 *Oct 26, 2011Feb 19, 2013Miller Industrial Towing Equipment IncLow center of gravity carrier
US9108557 *Dec 21, 2012Aug 18, 2015Miller Industries Towing Equipment Inc.Low center of gravity carrier
US20050218101 *Nov 29, 2004Oct 6, 2005Giampaolo MontineriTelescopic boom arm
US20090297314 *May 30, 2008Dec 3, 2009Miller Industries Towing Equipment Inc.Low center of gravity carrier
US20100047046 *Nov 5, 2009Feb 25, 2010Miller Industries Towing Equipment Inc.Low center of gravity carrier
US20120039695 *Oct 26, 2011Feb 16, 2012Miller Industries Towing Equipment, Inc.Low center of gravity carrier
US20150367766 *Aug 17, 2015Dec 24, 2015Miller Industries Towing Equipment Inc.Low center of gravity carrier
Classifications
U.S. Classification414/718
International ClassificationB66C13/00, B66C23/693, B66C13/12, B66C23/697, B66C23/00, B66C23/70
Cooperative ClassificationB66C13/12, B66C23/705
European ClassificationB66C13/12, B66C23/70B4
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