BRIEF DESCRIPTION OF THE DRAWINGS

[0001] FIG 1 is a plan view of an embodiment of a bottom portion of the strut of FIG. 10.

[0002] FIG 2 is a plan view of an embodiment of an intermediate portion of the strut of FIG. 10.

[0003] FIG 3 is a plan view of an embodiment of an upper portion of the strut of FIG. 10.

[0004] FIG 4 is a side elevation view of the strut lower portion of FIG. 1 with certain angled braces not shown.

[0005] FIG 5 is a side elevation view of the strut intermediate portion of FIG. 2 with certain angled braces not shown.

[0006] FIG 6 is a side elevation view of the strut upper portion of FIG. 3.

[0007] FIG. 7 is a sectional view along section 4-4 of FIG. 4.

[0008] FIG. 8 is a sectional view along section 5-5 of FIG. 5.

[0009] FIG. 9 is a sectional view along section 6-6 of FIG. 6.

[0010] FIG. 10 is a plan view of an embodiment of a strut in an extended configuration.

[0011] FIG. 1 1 is a plan view of the strut of FIG. 10 in a retracted configuration.

[0012] FIG. 12 is a sectional view along section 1 lA-1 1A of FIG. 1 1.

[0013] FIG. 13 is a sectional view along section 1 lB-1 IB of FIG. 1 1.

[0014] FIG. 14 is a plan view of another embodiment of a strut in an extended configuration.

[0015] FIG. 15 is a plan view of another embodiment of a strut in a retracted configuration.

[0016] FIG. 16 is a side elevation view of an embodiment of a conveyor in an operational configuration. [0017] FIG. 17 illustrates an alternative embodiment of a strut along the sectional view of FIG. 12.

DESCRIPTION

[0018] Referring to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, FIG. 16 illustrates a conveyor 100 having a truss 1 10. The truss 1 10 operably supports a plurality of idler assemblies 120 (e.g., forwardmost idler assemblies of each frame section 120m, 120d, and 120a). The idler assemblies 120 operably support an endless belt 122. The truss 1 10 optionally operably supports a tail pulley 190. The truss 1 10 optionally operably supports a head pulley 180. In some embodiments the truss 1 10 comprises a first conveyor section and a second conveyor section that is telescopically movable relative to the first conveyor section as disclosed in U.S. Patent No. 7,618,231, hereby incorporated by reference herein in its entirety. The head pulley 180 and tail pulley 190 optionally operably support the belt 122 in operation for conveying materials (e.g., aggregate materials such as rock, stone, sand, gravel, minerals, etc.) along a conveyance direction Dc. In some embodiments the head pulley 180 is driven (e.g., by a motor) in order to advance the belt 122.

[0019] The conveyor 100 optionally includes a support assembly 140. The support assembly 140 optionally includes a strut 200 supporting (e.g., pivotally coupled to) the truss 1 10. The strut 200 is optionally supported by (e.g., pivotally coupled to) an undercarriage 150 (e.g., having wheels or tracks for radial travel or "slewing" of the conveyor). The undercarriage 150 and/or other components and subsystems of the conveyor optionally have common features and/or functionality with the undercarriage embodiments disclosed in U.S. Patent Nos. 6,360,876 and 7,284,947, both of which are hereby incorporated herein by reference. The strut is optionally reconfigurable between retracted and extended configurations for elevating (i.e., raising and lowering or "luffing" the truss 1 10. A strut 160 (e.g., a fixed-length or telescoping strut) is optionally coupled (e.g., pivotally coupled) at a first end thereof to the undercarriage 150; the strut 160 is optionally coupled (e.g., pivotally coupled) at a second end thereof to the truss 1 10.

[0020] Referring to FIGs. 1-13, the strut 200 is illustrated in more detail according to some embodiments. In some embodiments, the strut comprises three or more frames. In some embodiments, two or more of the frames (e.g., the bottom two frames, three frames, etc.) include one or more internal braces (e.g., braces disposed at least partially or entirely between longitudinally extending beams of the frame and/or another frame slidingly engaged with the frame).

[0021] Referring to FIGs. 10 and 1 1, in some embodiments the strut 200 comprises a lower frame 300, an intermediate frame 400 and an upper frame 500. The lower frame 300 is optionally pivotally coupled at a lower end thereof to the undercarriage 150 (e.g., at pivot supports 332-1, 332-2). The intermediate frame 400 is optionally slidingly engaged with the lower frame 300 for sliding between retracted (e.g., FIG. 1 1, having a shorter overall length than FIG. 10) and extended (e.g., FIG. 10, having a longer overall length than FIG. 1 1) configurations of the strut 200. In the retracted configuration, the lower frame 300, the intermediate frame 400 and the upper frame 500 are nested with respect to one another such that an overall length of the strut 200 in the retracted configuration is approximately the length of any one of lower frame 300, intermediate frame 400 and upper frame 500. In the extended configuration, the lower frame 300, intermediate frame 400 and upper frame 500 are positioned relative to one another such that an overall length of the extended configuration is greater than the retracted

configuration.

[0022] The upper frame 500 is optionally slidingly engaged with the intermediate frame 400 for sliding between retracted and extended configurations of strut 200. The upper frame 500 is optionally pivotally coupled at an upper end thereof to the truss 1 10 (e.g., at pivot supports 532- 1, 532-2). In some embodiments, one or more actuators 230 (e.g., two actuators 230-1, 230-2), such as dual-acting hydraulic telescoping cylinders or other suitable actuators, are coupled at a first end to the lower frame 300 and at a second end to the intermediate frame 400 for selectively extending and retracting the strut 200. In some embodiments, one or more actuators 250 (e.g., two actuators 250-1, 250-2), such as dual-acting hydraulic telescoping cylinders or other suitable actuators, are coupled at a first end to the intermediate frame 400 and at a second end to the upper frame 500 for selectively extending and retracting the strut 200.

[0023] Referring to FIGs. 1, 4 and 7, the lower frame 300 optionally comprises first and second supports 350-1, 350-2. The supports 350-1, 350-2 are optionally longitudinally extending and optionally generally parallel. The supports 350-1, 350-2 are optionally transversely spaced apart. Each support 350 optionally comprises one or more beams, gussets, side plates, or other structure.

[0024] As illustrated in FIG. 7, each support 350 comprises first and second spaced apart beams 354a, 354b joined and spaced apart by a side plate 352. In various other embodiments, each support 350 may comprise a single beam of any cross-section (e.g., closed polygon, open polygon, square, partial square, rectangular, partially rectangular, cylindrical, semi-cylindrical, closed ellipse, partial ellipse, etc.). One or more gussets 358 (e.g., gussets 358a, 358b, 358c, 358d) are optionally mounted to each support 350 to strengthen the support. The supports 350-1, 350-2 are optionally joined at or near a lower end by a transversely extending base 330 which may comprise one or more braces, one or more beams, or other structure. In some embodiments, one or more actuator supports 334 (e.g., pivot supports) are mounted to the base 330 or other portion of the frame 300. In some embodiments, two supports 334-1, 334-2 are mounted to the base 330. The actuator supports 334 are optionally mounted to a generally upward-facing surface of the base 330 or other structure. The base 330 optionally supports one or more pivot supports 332 (e.g., 332-1, 332-2) which include pivots 333 (e.g., 333-1, 333-2). The pivots 333- 1, 333-2 are optionally aligned along a generally transverse axis and are optionally configured to be mounted to the undercarriage 150.

[0025] As described below in more detail according to various embodiments, the supports 350-1, 350-2 are optionally joined and/or supported by bracing 310 which optionally comprises one or more angled braces and/or one or more transversely extending braces.

[0026] One or more transversely extending braces (e.g., braces 31 1, 313, 315) are mounted to and extend between the supports 350-1, 350-2. In some embodiments, a first set of braces (e.g., braces 31 1a, 313a, 315a) is mounted to a first side of the support 350-1 and a first side of the support 350-2. In some embodiments, a second set of braces (e.g., braces 3 1 1b, 313b, 315b) is mounted to a second side (e.g., opposing the first side) of the support 350-1 and a second side (e.g., opposing the first side) of the support 350-2. In other embodiments, one or more braces may be alternatively or additionally mounted to surfaces of the supports 350-1, 350-2 that face one another (e.g., internal and/or inboard-facing surfaces of the frame 300). [0027] One or more transversely extending angled braces (e.g., braces 312, 314, 316, 318) are mounted to and extend between the supports 350-1, 350-2. In some embodiments, a first set of braces (e.g., braces 312a, 314a, 316a, 318a) is mounted to a first side of the support 350-1 and a first side of the support 350-2. In some embodiments, a second set of braces (e.g., 312b, 314b, 316b, 318b) is mounted to a second side (e.g., opposing the first side) of the support 350-1 and a second side (e.g., opposing the first side) of the support 350-2. In other embodiments, one or more angled braces may be alternatively or additionally mounted to surfaces of the supports 350- 1, 350-2 that face one another (e.g., internal and/or inboard-facing surfaces of the frame 300).

[0028] Referring to FIGs. 2, 5, and 8, the lower frame 400 optionally comprises first and second supports 450-1, 450-2. The supports 450-1, 450-2 are optionally longitudinally extending and optionally generally parallel. The supports 450-1, 450-2 are optionally transversely spaced apart. Each support 450 optionally comprises one or more beams, gussets, side plates, or other structure.

[0029] As illustrated in FIG. 8, each support 450 comprises a beam which according to various embodiments may be of any cross-section (e.g., closed polygon, open polygon, square, partial square, rectangular, partially rectangular, cylindrical, semi-cylindrical, closed ellipse, partial ellipse, etc.).

[0030] The supports 450-1, 450-2 are optionally joined by cross-supports 430, 440, 460, 470, which may each comprise one or more braces, one or more beams, or other structure. In some embodiments, one or more actuator supports 444 (e.g., pivot supports) are mounted to the cross- support 440 and oriented toward the lower end of the frame 400. In some embodiments, one or more actuator supports 436 (e.g., pivot supports) are mounted to the cross-support 460 and oriented toward the upper end of the frame 400.

[0031] As described below in more detail according to various embodiments, the supports 450-1, 450-2 are optionally joined and/or supported by bracing 410 which optionally comprises one or more angled braces and/or one or more transversely extending braces. The bracing 410 is optionally at least partially supported inboard of the supports 450 (e.g., on one or more brackets which may be mounted to the supports 450 such as to inboard surfaces thereof). [0032] One or more angled braces (e.g., braces 412, 414, 416) are optionally supported (e.g., indirectly) by and extend between the supports 450-1, 450-2. In some embodiments, a first set of braces (e.g., braces 412a, 414a, 416a) is spaced apart from a second set of braces (e.g., braces 412b, 414b, 416b). In some embodiments, the first set of braces is supported on one or more brackets (e.g., brackets 452, 454, 456, 458). The brackets optionally comprise angle brackets. The brackets 452 are optionally mounted on inboard surfaces of the supports 450.

[0033] One or more transversely extending braces (e.g., braces 41 1, 413, 415) are optionally supported (e.g., indirectly) by and extend between the supports 450-1, 450-2. In some embodiments, a first set of braces (e.g., braces 41 la, 413a, 415a) is spaced apart from a second set of braces (e.g., braces 41 lb, 413b, 415b). In some embodiments, the first set of braces is supported on one or more brackets (e.g., brackets 452a, 452b, 452c, 452d). The brackets 452 optionally comprise angle brackets. The brackets 452 are optionally mounted on inboard surfaces of the supports 450.

[0034] Referring to FIGs. 3, 6, and 9, the upper frame 500 optionally comprises first and second supports 550-1, 550-2. The supports 550-1, 550-2 are optionally longitudinally extending and optionally generally parallel. The supports 550-1, 550-2 are optionally transversely spaced apart.

[0035] As illustrated in FIG. 9, each support 550 comprises a beam which may be of any cross- section (e.g., closed polygon, open polygon, square, partial square, rectangular, partially rectangular, cylindrical, semi-cylindrical, closed ellipse, partial ellipse, etc.). In some

embodiments, a stop 558 is optionally mounted to each support 550 and disposed to contact the intermediate frame 400 in a retracted configuration and/or to prevent the strut 200 from retracting farther than a predetermined retracted configuration. The supports 550-1, 550-2 are optionally joined at or near an upper end by a transversely extending cross-support 530 which may comprise one or more braces, one or more beams, or other structure. In some embodiments, one or more actuator supports 536 (e.g., pivot supports) are mounted to the cross-support 530 or other portion of the frame 500. The actuator supports 536 are optionally mounted to a generally downward-facing surface of the cross-support 530 or other structure. The cross-support 530 optionally supports one or more pivot supports 532 (e.g., 532-1, 532-2) which may comprise plates and which optionally include pivots 533 (e.g., 533-1, 533-2). The pivots 533-1, 533-2 are optionally aligned along a generally transverse axis and are optionally configured to be mounted to the truss 1 10.

[0036] Referring to FIGs. 12-13, each support 550 of the upper frame 500 is optionally slidingly engaged with (e.g., at least partially received inside) a corresponding support 450 of the intermediate frame 400. Each support 450 of the intermediate frame is optionally slidingly engaged with a corresponding support 350 of the lower frame 300 (e.g., by at least partially received between the beams 354a, 354b). At least some braces (e.g., braces 41 1a, 41 lb) of the frame 400 are disposed inboard of the beams 354a, 354b such that the support 350 is able to slide over the support 450 without interference. At least some braces (e.g., braces 315a, 315b) of the frame 300 are sufficiently spaced apart to allow at least some braces (e.g., braces 41 1 a, 41 lb) to pass therebetween without interference as the strut 200 reconfigures (e.g., slides) into the retracted position.

[0037] In some alternative embodiments such as that shown in FIG. 17, the upper frame 500 includes one or more braces (e.g., brace 590) mounted to and/or extending between the supports 550. The brace 590 is optionally supported by (e.g., mounted to or indirectly supported by) inboard surfaces of the supports 550-1, 550-2. In some such embodiments, a modified support 450-1 ', 450-2' of the intermediate frame 400 can be provided, which optionally includes a slot 451 sized to allow the brace 590 to pass therethrough for reconfiguration of the strut 200.

[0038] Referring to FIGs. 14 and 15, an alternative embodiment of a strut 1400 is illustrated having two actuators 1510-1, 1510-2 and an actuator 1520 optionally longitudinally offset from the actuators 1510. The strut 1400 optionally comprises a lower frame 1430 slidingly engaged with an upper frame 1440 which optionally have at least some common features with the lower frame 300 and intermediate frame 400, respectively, of the strut 200 described above.

[0039] The actuators 1510 are optionally coupled (e.g., pivotally coupled) to actuator supports 1433 of the lower frame 1430. The actuator 1520 is optionally coupled (e.g., pivotally coupled) to an actuator support 1435. The actuator supports 1433, 1435 are optionally mounted to a base 1432 of the lower frame 1430. The actuator support 1435 is optionally offset (e.g.,

longitudinally offset) from the actuator supports 1433. [0040] The actuators 1510 are optionally coupled (e.g., pivotally coupled) to actuator supports 1443 of the upper frame 1440. The actuator 1520 is optionally coupled (e.g., pivotally coupled) to an actuator support 1445. The actuator supports 1443, 1445 are optionally mounted to a base 1442 of the upper frame 1440. The actuator support 1445 is optionally offset (e.g.,

longitudinally offset) from the actuator supports 1443.

[0041] Unless otherwise indicated expressly or by the context or function of various

components, in some embodiments the components described herein may be made of metal such as steel. In some embodiments, components including metal components described or illustrated herein as being connected (e.g., joined, mounted, etc.) may be connected by welding, fasteners, or other suitable methods or structure.

[0042] Ranges recited herein are intended to inclusively recite all values within the range provided in addition to the maximum and minimum range values. Headings used herein are simply for convenience of the reader and are not intended to be understood as limiting or used for any other purpose.

[0043] Although various embodiments have been described above, the details and features of the disclosed embodiments are not intended to be limiting, as many variations and modifications will be readily apparent to those of skill in the art. Accordingly, the scope of the present disclosure is intended to be interpreted broadly and to include all variations and modifications within the scope and spirit of the appended claims and their equivalents.