Source: https://patents.google.com/patent/US10458182B1/en
Timestamp: 2020-08-06 14:42:28
Document Index: 393301883

Matched Legal Cases: ['Application No. 62', 'Application No. 62', 'Application No. 62', 'Application No. 62', 'Application No. 62', 'Application No. 62', 'Application No. 62', 'Application No. 62', 'Application No. 62']

US10458182B1 - Load transfer stations - Google Patents
Load transfer stations Download PDF
US10458182B1
US10458182B1 US16/389,600 US201916389600A US10458182B1 US 10458182 B1 US10458182 B1 US 10458182B1 US 201916389600 A US201916389600 A US 201916389600A US 10458182 B1 US10458182 B1 US 10458182B1
US16/389,600
2018-04-23 Priority to US201862661414P priority Critical
2019-04-19 Application filed by Oshkosh Corp filed Critical Oshkosh Corp
2019-04-19 Priority to US16/389,600 priority patent/US10458182B1/en
2019-07-10 Assigned to OSHKOSH CORPORATION reassignment OSHKOSH CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARCHER, DAVID A., BETZ, ERIC D.
2019-10-29 Publication of US10458182B1 publication Critical patent/US10458182B1/en
E06C5/16—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended Fastening means during transport, e.g. mechanical, hydraulic using mechanical transmission only, with or without fluid or other non-mechanical couplings or clutches
E06C5/42—Devices for altering inclination; Latching devices therefor Balancing arrangements
A fire apparatus includes a chassis, axles coupled to the chassis, a turntable rotatably coupled to the chassis, and an aerial ladder assembly pivotably coupled the turntable. The aerial ladder assembly includes a first ladder section extending longitudinally, a second ladder section extending longitudinally, and a support slidably coupling the second ladder section to the first ladder section such that the first ladder section supports the second ladder section. The support facilitates longitudinal movement of the second ladder section relative to the first ladder section between an extended position and a retracted position. The support is pivotably coupled to the first ladder section.
This application (a) claims the benefit of U.S. Provisional Patent Application No. 62/661,414, filed Apr. 23, 2018, and (b) is related to (i) U.S. patent application Ser. No. 16/389,630, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,382, filed Apr. 23, 2018, (ii) U.S. patent application Ser. No. 16/389,653, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,420, filed Apr. 23, 2018, (iii) U.S. patent application Ser. No. 16/389,570, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,384, filed Apr. 23, 2018, (iv) U.S. patent application Ser. No. 16/389,143, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,419, filed Apr. 23, 2018, (v) U.S. patent application Ser. No. 16/389,176, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,426, filed Apr. 23, 2018, (vi) U.S. patent application Ser. No. 16/389,029, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,335, filed Apr. 23, 2018, and U.S. Provisional Patent Application No. 62/829,922, filed Apr. 5, 2019, and (vii) U.S. patent application Ser. No. 16/389,072, filed Apr. 19, 2019, which claims the benefit of U.S. Provisional Patent Application No. 62/661,330, filed Apr. 23, 2018, all of which are incorporated herein by reference in their entireties.
Certain types of fire apparatuses include aerial assemblies. These aerial assemblies typically include a turntable that is rotatably coupled to a chassis of the vehicle and an aerial ladder assembly that is pivotably coupled to the turntable. The aerial ladder assembly includes multiple sections slidably coupled to one another such that the ladder assembly is extendable over a great distance. Accordingly, the aerial assembly may be actuated to move the distal end of the aerial ladder assembly throughout a working envelope, providing firefighters with access to distant locations that would not otherwise be accessible (e.g., an upper floor of a burning building, etc.).
The aerial ladder assembly is cantilevered off of the turntable. Specifically, a base section of the ladder assembly is pivtoably coupled to the turntable, and the other sections of the aerial ladder assembly are supported by the base section. Each ladder section is slidably coupled to the one above it using load transfer stations to facilitate relative movement between ladder the sections. In some configurations, a work basket is coupled to a distal end of the aerial ladder assembly. The work basket may support the weight of multiple firefighters, their equipment, and the work basket. Accordingly, the load transfer stations can experience large forces throughout operation. These large forces are conventionally accommodated using large, heavy load transfer stations to counteract wear.
One embodiment relates to a fire apparatus. The fire apparatus includes a chassis, axles coupled to the chassis, a turntable rotatably coupled to the chassis, and an aerial ladder assembly pivotably coupled the turntable. The aerial ladder assembly includes a first ladder section extending longitudinally, a second ladder section extending longitudinally, and a support slidably coupling the second ladder section to the first ladder section such that the first ladder section supports the second ladder section. The support facilitates longitudinal movement of the second ladder section relative to the first ladder section between an extended position and a retracted position. The support is pivotably coupled to the first ladder section.
Another embodiment relates to a ladder for an aerial ladder assembly for a fire apparatus. The aerial ladder assembly includes a first ladder section extending longitudinally, a second ladder section extending longitudinally, a first support coupled to the first ladder section, and a second support coupled to the first ladder section and longitudinally offset from the first support. The second ladder section is selectively repositionable relative to the first ladder section in a longitudinal direction between an extended position and a retracted position. The first support and the second support are configured to slidably couple the second ladder section to the first ladder section. The first support is configured to limit downward vertical movement of the second ladder section. The second support is configured to limit upward vertical movement of the second ladder section. At least one of (a) the first support is pivotable relative to the first ladder section about a first lateral axis and (b) the second support is pivotable relative to the first ladder section about a second lateral axis.
Still another embodiment relates to a load transfer station for an aerial ladder assembly of a fire apparatus. The aerial ladder assembly includes a first ladder section and a second ladder section. The load transfer station includes a first support configured to be pivotably coupled to the first ladder section and a second support configured to be pivotably coupled to the first ladder section. The first support defines a first engagement surface, and the second support defines a second engagement surface. The first engagement surface is configured to slidably engage a bottom surface of a base rail of the second ladder section to limit downward movement of the second ladder section when the aerial ladder assembly is in an extended configuration. The second engagement surface is configured to slidably engage a top surface of the base rail when the aerial ladder assembly is in the extended configuration.
FIG. 22 is a side view of the aerial ladder assembly and turntable of FIG. 16, according to an exemplary embodiment.
FIG. 23 is a perspective view of the aerial ladder assembly and turntable of FIG. 16, according to an exemplary embodiment.
FIG. 24 is a perspective view of the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 25 is a rear view of the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 26 is a perspective view of a fly section of the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 27 is an exploded view of the fly section of FIG. 26, according to an exemplary embodiment.
FIG. 28 is a section view of the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 29 is a section view of hand rail of the fly section of FIG. 26, according to an exemplary embodiment.
FIG. 30 is a bottom rear perspective view of a work basket of the mid-mount fire apparatus of FIG. 1 and the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 31 is a top rear perspective view of the work basket of FIG. 30 and the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIGS. 32-38 are section views of a hand rail of the fly section of FIG. 26, according to various exemplary embodiments.
FIG. 39 is a side view of a hand rail of the fly section of FIG. 26, according to an exemplary embodiment.
FIG. 40 is a section view a hand rail of the fly section of FIG. 26, according to an exemplary embodiment.
FIG. 41 is a perspective view of a base section and a series of load transfer stations of the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 42 is a perspective view of the base section of FIG. 41 and a front support of a load transfer station of FIG. 41, according to an exemplary embodiment.
FIG. 43 is another perspective view the base section of FIG. 41 and the front support of FIG. 42, according to an exemplary embodiment.
FIG. 44 is another perspective view of the base section of FIG. 41 and the front support of FIG. 42, according to an exemplary embodiment.
FIG. 45 is a perspective view of a middle section of the aerial ladder assembly of FIG. 16 and a front support of a load transfer station of FIG. 41, according to an exemplary embodiment.
FIG. 46 is another perspective view of the middle section and the front support of FIG. 45, according to an exemplary embodiment.
FIG. 47 is a perspective view of the front support of FIG. 45, according to an exemplary embodiment.
FIG. 48 is a section view of the fly section of FIG. 26 and a front support of a load transfer station of FIG. 41, according to an exemplary embodiment.
FIG. 49 is a perspective view of the base section of FIG. 41 and a top rear support and a bottom rear support of the load transfer station of FIG. 41, according to an exemplary embodiment.
FIG. 50 is a perspective view of the middle section of FIG. 45 and a top rear support and a bottom rear support of the load transfer station of FIG. 45, according to an exemplary embodiment.
FIG. 51 is a section view of the fly section of FIG. 26 and a top rear support and a bottom rear support of the load transfer station of FIG. 48, according to an exemplary embodiment.
FIG. 52 is a section view of a fly section and a front support of a load transfer station of the aerial ladder assembly of FIG. 16, according to an exemplary embodiment.
FIG. 53 is a section view of the fly section of FIG. 52 and a top rear support and a bottom rear support of the load transfer station of FIG. 52, according to an exemplary embodiment.
FIG. 54 is an exploded view of a base section of a ladder assembly and a load transfer station including a pin, according to an exemplary embodiment.
FIG. 55 is a side view of the pin of FIG. 54, according to an exemplary embodiment.
FIG. 56 is a perspective view of the pin of FIG. 54, according to an exemplary embodiment.
FIG. 57 is a front view of the pin of FIG. 54, according to an exemplary embodiment.
According to an exemplary embodiment, a vehicle includes various components that improve performance relative to traditional systems. In one embodiment, the vehicle is a fire apparatus that includes an aerial ladder assembly. The aerial ladder assembly is coupled to the chassis and rotatable about an axis. The aerial ladder assembly includes a series of ladder sections that can be extended and retracted relative to one another. Each ladder section is slidably coupled to the ladder section immediately below it through a load transfer station. Each load transfer station includes a front support, a top rear support, and a bottom rear support. Each front support defines a recess that receives a base rail of a supported ladder section. Each top rear support and bottom rear support receive one of the base rails therebetween. The front supports and the top rear supports are pivotably coupled to a supporting ladder section. Because the front supports and top rear supports can rotate, the front supports and top rear supports automatically rotate to a position in which the surface area of the front supports and the top rear supports contacting the base rails is maximized. This reduces the stress on the supported ladder section and the supports, reducing wear and facilitating lessening the weight of the aerial ladder assembly.
As shown in FIGS. 1, 2, and 10-12, the sides of the body 110 define a plurality of compartments, shown as storage compartments 112. The storage compartments 112 may receive and store miscellaneous items and gear used by emergency response personnel (e.g., helmets, axes, oxygen tanks, hoses, medical kits, etc.). As shown in FIGS. 5, 6, and 10-12, the rear end 4 of the body 110 defines a longitudinal storage compartment that extends along the longitudinal axis 14, shown as ground ladder compartment 114. The ground ladder compartment 114 may receive and store one or more ground ladders. As shown in FIGS. 3, 5, and 10-13, a top surface, shown as top platform 122, of the body 110 defines a cavity, shown as hose storage platform 116, and a channel, shown as hose chute 118, extending from the hose storage platform 116 to the rear end 4 of the body 110. The hose storage platform 116 may receive and store one or more hoses (e.g., up to 1000 feet of 5 inch diameter hose, etc.), which may be pulled from the hose storage platform 116 though the hose chute 118.
As shown in FIGS. 1, 12, 17, and 18, the rear assembly 100 includes a second selectively deployable ladder, shown as side ladder 132, coupled to a side (e.g., a left side, a right side, a driver's side, a passenger's side, etc.) of the body 110. In some embodiments, the rear assembly 100 includes two side ladders 132, one coupled to each side of the body 110. According to an exemplary embodiment, the side ladder 132 is hingedly coupled to the body 110 and repositionable between a stowed position (see, e.g., FIGS. 1, 2, 17, 18, etc.) and a deployed position. The side ladder 132 may be selectively deployed such that a user may climb the side ladder 132 to access one or more components of the aerial assembly 500 (e.g., a work platform, an aerial ladder assembly, a control console, etc.).
As shown in FIG. 16, the aerial ladder assembly 700 has a plurality of nesting ladder sections that telescope with respect to one another including a first section, shown as base section 800; a second section, shown as lower middle section 900; a third ladder section, shown as middle section 1000; a fourth section, shown as upper middle section 1100; and a fifth section, shown as fly section 1200. As shown in FIGS. 16 and 17, the side supports 514 of the turntable 510 define a first interface, shown as ladder interface 516, and a second interface, shown as actuator interface 518. As shown in FIG. 16, the base section 800 of the aerial ladder assembly 700 defines first interfaces, shown as pivot interfaces 802, and second interfaces, shown as actuator interfaces 804. As shown in FIGS. 16 and 17, the ladder interfaces 516 of the side supports 514 of the turntable 510 and the pivot interfaces 802 of the base section 800 are positioned to align and cooperatively receive a pin, shown as heel pin 520, to pivotally couple the proximal end 702 of the aerial ladder assembly 700 to the turntable 510. As shown in FIG. 17, the aerial ladder assembly 700 includes first ladder actuators or linear actuators (e.g., hydraulic cylinders, etc.), shown as pivot actuators 710. Each of the pivot actuators 710 has a first end portion, shown as end 712, coupled to a respective actuator interface 518 of the side supports 514 of the turntable 510 and an opposing second end portion, shown as end 714, coupled to a respective actuator interface 804 of the base section 800. According to an exemplary embodiment, the pivot actuators 710 are kept in tension such that retraction thereof lifts and rotates the distal end 704 of the aerial ladder assembly 700 about a lateral axis, shown as lateral pivot axis 42, defined by the heel pin 520. In other embodiments, the pivot actuators 710 are kept in compression such that extension thereof lifts and rotates the distal end 704 of the aerial ladder assembly 700 about the lateral pivot axis 42. In an alternative embodiment, the aerial ladder assembly only includes one pivot actuator 710.
Aerial Ladder Assembly Structure
Referring to FIGS. 16, 22, and 23, each extension actuator 720 is part of a cable control assembly 722. As the extension actuator 720 extends and retracts, a cable 724 is pulled into and/or payed out of the cable control assembly 722. The cables 724 extend along each of the base section 800, the lower middle section 900, the middle section 1000, the upper middle section 1100, and the fly section 1200 between a series of pulleys 726. The pulleys 726 are rotatably coupled to the base section 800, the lower middle section 900, the middle section 1000, the upper middle section 1100, and the fly section 1200. As the cable control assembly 722 pulls the cable 724 in and pays/or out the cable 724, the cable 724 exerts forces on the pulleys 726, which forces the aerial ladder assembly 700 to extend or retract. The cable control assemblies 722, the cables 724, and the pulleys 726 actively control both the extension and retraction of the aerial ladder assembly 700 such that the aerial ladder assembly 700 can extend and retract independent of the force of gravity.
Referring to FIGS. 24-28, a longitudinal axis 732, a lateral axis 734, and a vertical axis 736 are defined with respect to the aerial ladder assembly 700. A center plane 738 is defined perpendicular to the lateral axis 734 (i.e., parallel to the longitudinal axis 732 and the vertical axis 736). The center plane 738 is laterally centered with respect to the aerial ladder assembly 700 (e.g., with respect to each ladder section of the aerial ladder assembly 700).
Referring to FIGS. 26 and 27, the fly section 1200 is shown according to an exemplary embodiment. The fly section 1200 includes a pair of support members, shown as base rails 1202. The base rails 1202 extend longitudinally (i.e., parallel to the longitudinal axis 732) and are laterally offset from one another. The base rails 1202 are symmetrically arranged about the center plane 738. As shown, the base rails 1202 are tubular members each having a square cross section. In other embodiments, the base rails 1202 have other cross sectional shapes (e.g., C-channel, circular, etc.). Further alternatively, the base rails 1202 may be made from one or more members (e.g., tubular members, C-channels, etc.) coupled to one or more plates. The ends of the base rails 1202 may be capped (e.g., a plate welded over the open end) to prevent debris from entering the base rails 1202. Each base rail 1202 defines a pair of apertures 1204 that extend from an outer surface of the base rail 1202 to an interior volume of the base rail 1202. The apertures 1204 are arranged near opposite ends of the fly section 1200. The cables 724 may pass through one aperture 1204, through the interior volume of the base rail 1202, and out through the other aperture 1204. This arrangement reduces the length of the cable 724 that is exposed, reducing the chances of an operator or piece of equipment being caught by the cables 724. In other embodiments, other components extend through the apertures 1204 and into the base rail 1202, such as wires or hoses.
The fly section 1200 further includes a series of structural members or steps, shown as ladder rungs 1206, that extend between the base rails 1202. As shown, the ladder rungs 1206 are tubular members each having a round cross section. The ladder rungs 1206 are fixedly coupled to both base rails 1202, thereby indirectly fixedly coupling the base rails 1202 together. The ladder rungs 1206 are configured to act as steps to support the weight of operators and their equipment as the operators ascend or descend the aerial ladder assembly 700. The fly section 1200 further includes support members, shown as ladder rung supports 1208. The ladder rung supports 1208 extend between one of the base rails 1202 and one of the ladder rungs 1206 at an angle relative to the base rails 1202 (e.g., 30 degrees, 45 degrees, etc.). Each ladder rung support 1208 is fixedly coupled to one of the base rails 1202 and one of the ladder rungs 1206. Each ladder rung 1206 engages a pair of ladder rung supports 1208. The ladder rung supports 1208 extend below the corresponding ladder rung 1206 when the aerial ladder assembly 700 is raised. Accordingly, the ladder rung supports 1208 help to support the downward weight of the operators and their equipment. In other embodiments, the ladder rungs 1206 and/or the ladder rung supports 1208 have other cross sectional shapes (e.g., C-channel, square, etc.).
Referring to FIGS. 26-29, the fly section 1200 further includes a pair of hand rails 1210 extending longitudinally. Each hand rail 1210 is positioned above and laterally aligned with one of the base rails 1202. The hand rails 1210 are symmetrically arranged about the center plane 738. Each hand rail 1210 includes a rail, horizontal member, top member, or structural member, shown as top plate 1212, and a vertical member, center member, or structural member, shown as gusset plate 1214. The top plate 1212 has a solid cross section. Accordingly, the top plate 1212 is not a tubular member. As shown in FIG. 29, the top plate 1212 defines a top surface 1216 and a bottom surface 1218. The gusset plate 1214 engages and is fixedly coupled to the bottom surface 1218. In some embodiments, the top surface 1216 and the bottom surface 1218 extend horizontally (i.e., parallel to the longitudinal axis 732 and the lateral axis 734). The gusset plate 1214 extends vertically (e.g., parallel to the center plane 738).
Referring to FIGS. 26-28, the fly section 1200 includes a series of structural members, shown as angled lacing members 1220 and vertical lacing members 1222, extending between each base rail 1202 and the corresponding hand rail 1210. The angled lacing members 1220 and the vertical lacing members 1222 are each tubular members. In other embodiments, the angled lacing members 1220 and/or the vertical lacing members 1222 have a solid cross section. The angled lacing members 1220 and the vertical lacing members 1222 may have rectangular cross sections, circular cross sections, or other types of cross sections. The angled lacing members 1220 and the vertical lacing members 1222 extend within a plane parallel to the center plane 738. The angled lacing members 1220 are oriented at an angle relative to the longitudinal axis 732 (e.g., 30 degrees, 45 degrees, 60 degrees, etc.). The vertical lacing members 1222 extend perpendicular to the longitudinal axis 732 and engage the hand rail 1210 between the angled lacing members 1220. The angled lacing members 1220 and the vertical lacing members 1222 are fixedly coupled to the base rails 1202 and the hand rails 1210. Accordingly, each base rail 1202, the corresponding hand rail 1210, the corresponding angled lacing members 1220, and the corresponding vertical lacing members 1222 form a truss structure that resists bending about a lateral axis.
The angled lacing members 1220 and the vertical lacing members 1222 each engage the corresponding base rail 1202 at a bottom end. As shown in FIG. 25, the base rails 1202 extend farther laterally outward than (i.e., farther from the center plane 738 than) the angled lacing members 1220 and the vertical lacing members 1222. The bottom ends of some of the angled lacing members 1220 define a channel, slot, or groove that receives a support member, shown as gusset plate 1224. Specifically, pairs of the angled lacing members 1220 meet at the base rail 1202, and the gusset plate 1224 extends upward from the base rail 1202 into the grooves defined by the angled lacing members 1220. Each gusset plate 1224 is fixedly coupled to the base rail 1202 and the corresponding angled lacing members 1220. A series of support members, shown as gusset plates 1226, extend between an outer surface one of the vertical lacing members 1222 and the base rail 1202. Each gusset plate 1226 is fixedly coupled to the base rail 1202 and the corresponding vertical lacing member 1222. The gusset plates 1224 and the gusset plates 1226 increase the strength of the fly section 1200.
The fly section 1200 further includes a structural assembly, shown as pulley support assembly 1228. The pulley support assembly 1228 includes a pair of support members, shown as vertical supports 1230, that each extend between and fixedly couple to the base rail 1202 and one of the angled lacing members 1220. Each vertical support 1230 is coupled to a protrusion, shown as boss 1232. The bosses 1232 each define an aperture 1234 that extends longitudinally therethrough. The bosses 1232 are configured to support one of the pulleys 726. By way of example, a bracket that supports one of the pulleys 726 may extend into the apertures 1234.
Referring to FIGS. 26-29, the angled lacing members 1220 and the vertical lacing members 1222 each engage the hand rail 1210 at a top end. Specifically, the angled lacing members 1220 and the vertical lacing members 1222 each define a channel, slot, or groove 1240 that receives the gusset plate 1214. Accordingly, the angled lacing members 1220 and the vertical lacing members 1222 each extend both laterally inward of (i.e., closer to the center plane 738 than) and laterally outward of (i.e., farther from the center plane 738 than) the gusset plate 1214. The angled lacing members 1220 and the vertical lacing members 1222 may engage the gusset plate 1214 along the entire surface of the groove 1240. The angled lacing members 1220 and the vertical lacing members 1222 extend upward along the gusset plate 1214 until the angled lacing members 1220 and the vertical lacing members 1222 engage the bottom surface 1218 of the top plate 1212. The angled lacing members 1220 and the vertical lacing members 1222 are directly fixedly coupled to both the gusset plate 1214 and the top plate 1212. In another embodiment, one or more of the structural members of the aerial ladder assembly 700 (e.g., the angled lacing members 1220, the vertical lacing members 1222, etc.) do not extend to the respective a rail, horizontal member, top member, or structural member (e.g., top plate 1212, etc.). By way of example, the structural member(s) may be coupled to the respective support member(s) (e.g., gusset plate 1214, etc.), and the support member may be coupled to the rail, horizontal member, top member, or structural member, but the structural member(s) may terminate in one or more locations that are spaced from the rail, horizontal member, top member, or structural member.
The base rails 1202 extend a first length A1 in the longitudinal direction. The top plates 1212 extend a second length A2 in the longitudinal direction. The length A2 is less than the length A1. The gusset plates 1214 extend a third length A3 in the longitudinal direction. The length A3 is greater than the length A2. Accordingly, the gusset plates 1214 extend along the entire length of the top plates 1212. This facilitates a connection between the top plate 1212 and the gusset plate 1214 that extends along the entire length of the top plate 1212, increasing the strength of the hand rail 1210. In other embodiments, each hand rail 1210 includes multiple gusset plates 1214 arranged sequentially along the length of the fly section 1200. In such an embodiment, the length A3 may be less than the length A2. By way of example, the length A3 may be 25%, 50% or 75% of the length A2.
A height of the gusset plate 1214 is defined parallel to the vertical axis 736. The gusset plate 1214 includes first sections, shown as interface sections 1242, positioned between second sections, shown as midsections 1244. The height of the gusset plate 1214 in the interface sections 1242 is greater than the height of the gusset plate 1214 in the midsections 1244. This provides a greater surface area for the angled lacing members 1220 and the vertical lacing members 1222 to couple to, increasing the strength of the coupling between the gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222. A first end section, shown as proximal end section 1246, and a second end section, shown as distal end section 1248, of the gusset plate 1214 each have heights greater than that of the interface sections 1242 and the midsections 1244. The proximal end section 1246 is positioned adjacent the end of the top plate 1212 opposite the distal end 704 of the aerial ladder assembly 700. The distal end section 1248 is positioned adjacent the end of the top plate 1212 closest to the distal end 704 of the aerial ladder assembly 700.
The distal end section 1248 defines an aperture 1250 that extends laterally therethrough. The aperture 1250 receives a bearing or bushing, shown as bushing 1252. The bushing 1252 is coupled to the gusset plate 1214. The bushing 1252 defines a laterally-extending aperture. The bushing 1252 is configured to receive a pin (e.g., a bolt, a rod, a dowel pin, etc.) therethrough. The fly section 1200 further includes an interface, shown as protrusion 1254, extending longitudinally forward from each base rail 1202. The protrusion 1254 is fixedly coupled to the corresponding base rail 1202. The protrusions 1254 each define an aperture extending laterally therethrough that is configured to receive a pin.
Referring to FIGS. 1, 2, 30, and 31, the aerial assembly 500 includes a pair of linear actuators (e.g., hydraulic cylinders, pneumatic cylinders, electric linear actuators, etc.), shown as basket actuators 1340, each having a first end portion, shown as distal end portion 1342, and a second end portion, shown as proximal end portion 1344. The distal end portion 1342 pivotably couples to the work basket 1300. Specifically, a pair of protrusions, shown as brackets 1346, extend from a rear side of the work basket 1300 on either side of the basket door 1330 near the top of the work basket 1300. The brackets 1346 each define a set of laterally-extending apertures. A pin extends through the apertures of the brackets 1346 as well as an aperture defined by the distal end portion 1342 of the basket actuator 1340. The proximal end portion 1344 of the basket actuator 1340 pivotably couples to the fly section 1200. Specifically, a pin extends through the bushing 1252 as well as through an aperture defined by the proximal end portion 1344 of the basket actuator 1340. The work basket 1300 is also pivotably coupled to the fly section 1200. Specifically, a pair of protrusions or brackets extend rearward from the work basket 1300. These brackets each define laterally-extending apertures. A pair of pins extend through these laterally-extending apertures and the apertures of the protrusions 1254.
The work basket 1300 pivots about an axis of rotation 1350 relative to the fly section 1200. The basket actuators 1340 pivot about an axis of rotation 1352 relative to the work basket 1300 and about an axis of rotation 1354 relative to the fly section 1200. The axis of rotation 1350, the axis of rotation 1352, and the axis of rotation 1354 all extend parallel to the lateral axis 734. The basket actuators 1340 control the orientation of the work basket 1300 relative to the fly section 1200. When the basket actuators 1340 extend, the work basket 1300 rotates forward (i.e., away from the fly section 1200). When the basket actuators 1340 retract, the work basket 1300 rotates backward (i.e., toward the fly section 1200). Accordingly, the basket actuators 1340 are in tension when the work basket 1300 is loaded.
In the embodiment shown in FIGS. 26-29, the top plate 1212 has a rectangular cross section. The thickness of the top plate 1212, which is defined between the top surface 1216 and the bottom surface 1218, is uniform. The gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222 are laterally centered on the top plate 1212. The top plate 1212 extends both (a) laterally inward of the gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222 and (b) laterally outward of the gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222. This provides an overhang for the operators to wrap their fingers around when traveling along the fly section 1200. The top surfaces of the angled lacing members 1220 and the vertical lacing members 1222 each engage the bottom surface 1218 along their entire lengths.
Conventional ladder sections include a tubular hand rail that engages a series of lacing members. Such tubular hand rails often have a rectangular cross sectional shape. The tubular shape of the tubular hand rail is resistant to bending, even when separated from the rest of the ladder section. Accordingly, the tubular hand rail increases the resistance to bending of the ladder section. However, the tubular hand rails can be quite difficult to grip properly, as the height of the tubular hand rail is commonly sufficient to prevent an operator's fingers from wrapping around the tubular hand rail to contact a bottom surface of the tubular hand rail. Instead, the operator is forced to grip onto the laterally-facing sides of the tubular hand rail, which is less secure and can lead to slipping.
The hand rail 1210 improves the strength and ease of use of the fly section 1200 relative to a conventional tubular hand rail. Under normal loading, the fly section 1200 is bent about a lateral bending axis extending near the vertical center of the fly section 1200. The moment of inertia of a structure, which defines its resistance to bending, is greater as the cross sectional area of the structure moves away from the axis about which the structure is bent. Accordingly, it is desirable to place as much material as possible near the top and bottom surfaces of the fly section 1200. The top plate 1212 is solid and positioned at the very top of the fly section 1200. In this arrangement, the contribution of the top plate 1212 to the moment of inertia of the fly section 1200 is maximized. Additionally, the gusset plate 1214 further increases the moment of inertia while strengthening the connections between the angled lacing members 1220, the vertical lacing members 1222, and the top plate 1212. Comparatively, the conventional tubular hand rail provides a lesser strength to weight ratio than the hand rail 1210. The bottom wall of the tubular hand rail is offset toward the bending axis, reducing its contribution to the moment of inertia of the corresponding ladder section. Additionally, the fly section 1200 can be shorter than a comparable ladder section incorporating a tubular hand rail, as the top plate 1212 does not need to be as far away from the bending axis to produce a similar moment of inertia.
Additionally, the hand rail 1210 is easier to grip than a conventional tubular hand rail. The width of the top plate 1212 of the hand rail 1210 is considerably less than its thickness. This facilitates an operator placing the palm of their hand on the top surface 1216 and wrapping their fingers along the lateral side surfaces of the top plate 1212 to engage the bottom surface 1218. Accordingly, the operator can apply a force perpendicular to the bottom surface 1218 and solidly engage the top plate 1212 to support themselves. The conventional tubular hand rail that only provides engagement with the lateral side surfaces relies on frictional forces between the operator's fingers and the lateral side surfaces of the tubular hand rail. The frictional forces are dependent on the grip strength of the operator. Accordingly, to obtain sufficient support, the operator constantly has to impart a gripping force on the tubular hand rail, which can be tiring.
Referring to FIGS. 32-40, in other alternative embodiments, the structure of the hand rail 1210 is modified. The shape, size, and position of the top plate 1212 and the gusset plate 1214 may be varied. Referring to FIG. 32, the top plate 1212 is offset laterally inward relative to the embodiment shown in FIG. 29. The side of the top plate 1212 that faces laterally outward is flush with the gusset plate 1214. The angled lacing members 1220 and the vertical lacing members 1222 extend laterally outward of the top plate 1212 and above the gusset plate 1214 to engage a lateral side of the top plate 1212. A portion of the top surfaces of the angled lacing members 1220 and the vertical lacing members 1222 is exposed such that it does not engage the top plate 1212. The angled lacing members 1220 and the vertical lacing members 1222 are chamfered to smooth the transitions between the angled lacing members 1220, the vertical lacing members 1222, and the top plate 1212.
Referring to FIG. 33, the top plate 1212 is offset laterally outward relative to the embodiment shown in FIG. 29. The side of the top plate 1212 that faces laterally inward is flush with the gusset plate 1214. The angled lacing members 1220 and the vertical lacing members 1222 extend laterally inward of the top plate 1212. The angled lacing members 1220 and the vertical lacing members 1222 do not extend above the gusset plate 1214 to engage a lateral side of the top plate 1212.
Referring to FIG. 34, the top plate 1212 is offset laterally outward relative to the embodiment shown in FIG. 29. Additionally, the angled lacing members 1220 and the vertical lacing members 1222 are narrower than the angled lacing members 1220 and the vertical lacing members 1222 shown in FIG. 29, and the gusset plate 1214 is shorter than the gusset plate 1214 shown in FIG. 29. Although the gusset plate 1214, angled lacing members 1220, and the vertical lacing members 1222 are not laterally centered with the top plate 1212, the top plate 1212 still extends both (a) laterally inward of the gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222 and (b) laterally outward of the gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222.
Referring to FIG. 35, the groove 1240 is omitted. Instead, the gusset plate 1214 engages and is coupled to a lateral side surface of the angled lacing members 1220 and the vertical lacing members 1222. The gusset plate 1214, angled lacing members 1220, and the vertical lacing members 1222 each engage the bottom surface 1218.
Referring to FIG. 36, the top plate 1212 is differently shaped than the top plate 1212 shown in FIG. 29. Specifically, a groove or notch is defined extending upward from the bottom surface 1218, removing a portion of the material of the top plate 1212. Accordingly, in this embodiment, the top plate 1212 does not have a uniform thickness. Instead, the thickness is reduced throughout the portion of the top plate 1212 that defines the notch. Due to the notch, a greater portion of the cross sectional area is positioned near the top surface 1216 than near the bottom surface 1218, increasing the moment of inertia to weight ratio of the hand rail 1210.
Referring to FIG. 37, the top surface 1216 and the bottom surface 1218 both extend horizontally near the lateral center of the hand rail 1210. As the top plate 1212 extends laterally beyond the angled lacing members 1220 and the vertical lacing members 1222, the bottom surface 1218 angles upwards such that the top plate 1212 tapers as it extends laterally outwards. This gradually reduces the thickness of the top plate 1212. Due to the taper, a greater portion of the cross sectional area is positioned near the top surface 1216 than near the bottom surface 1218, increasing the moment of inertia to weight ratio of the hand rail 1210. In other embodiments, the top plate 1212 is otherwise tapered. By way of example, the top surface 1216 may extend downward. By way of another example, the taper may extend through the entirety of the top plate 1212 such that the top surface 1216 is horizontal, and the entirety of the bottom surface 1218 extends at an angle relative to the top surface 1216.
Referring to FIG. 38, the top plate 1212 is angled about a longitudinal axis relative to a horizontal plane. Accordingly, the top surface 1216 and the bottom surface 1218 extend upward as the top plate 1212 extends laterally outward. The top surfaces of the gusset plate 1214, the angled lacing members 1220, and the vertical lacing members 1222 are angled to match the angle of the bottom surface 1218. In other embodiments, the top plate 1212 may be angled in the opposite direction (i.e., such that the top surface 1216 and the bottom surface 1218 extend downward as the top plate 1212 extends laterally outward).
In some embodiments one or more surfaces of the top plate 1212 are shaped, textured (e.g., knurled, slotted, etc.), or otherwise configured to facilitate a solid grip by the user on the hand rail 1210. Referring to FIGS. 39 and 40, the bottom surface 1218 of the top plate 1212 is scalloped. Portions of the top plate 1212 are cut away to form a series of rounded protrusions 1255. In some embodiments, the rounded protrusions 1255 have a circular curvature. A portion of the bottom surface 1218 near the lateral center of the top plate 1212 is flat to facilitate engagement between the gusset plate 1214, the angled lacing member 1220, and the vertical lacing members 1222 and the bottom surface 1218. The rounded protrusions 1255 are located both laterally inward and laterally outward from the angled lacing members 1220 and the vertical lacing members 1222. The rounded protrusions 1255 facilitate a non-slipping engagement between an operator's fingers and the top plate 1212.
In some embodiments, the top plate 1212 is tapered in the longitudinal direction. By way of example, the width and/or thickness of the top plate 1212 may gradually decrease from the end of the fly section 1200 opposite the distal end 704 to the end of the fly section 1200 closest to the distal end 704. When a weight is placed at the distal end 704, the stresses in the fly section 1200 gradually increase as the fly section 1200 extends away from the distal end 704. Accordingly, the width and/or thickness of the top plate 1212 may be reduced gradually toward the distal end 704 without affecting the overall load capacity of the aerial ladder assembly 700. Further, this reduction in width and/or thickness decreases the overall weight of the aerial ladder assembly 700, increasing the load capacity of the aerial ladder assembly 700.
The fly section 1200 may be assembled as a weldment. By way of example, two or more of the base rails 1202, the ladder rungs 1206, the ladder rung supports 1208, the top plate 1212, the gusset plate 1214, the angled lacing members 1220, the vertical lacing members 1222, the gusset plates 1224, the gusset plates 1226, the vertical supports 1230, the bosses 1232, the bushings 1252, and the protrusions 1254 may be provided as separate components. These separate components than may be fixedly coupled to one another as shown and described herein through welding. Alternatively one or more of the components may be fastened together. In some embodiments, the top plate 1212 and the gusset plate 1214 are provided as separate components. In other embodiments, the top plate 1212 and the gusset plate 1214 are integrally formed as a single component. The top plate 1212 and the gusset plate 1214 may be welded or fastened together. Alternatively, the hand rail 1210 may be extruded or forged and subsequently machined into its final shape.
Referring to FIGS. 24, 25, and 28, the lower middle section 900, the middle section 1000, and the upper middle section 1100 have a construction that is substantially similar to that of the fly section 1200 except as otherwise stated herein. Components in these sections may be substantially similar to the parts in the fly section 1200 having similar names. The lower middle section 900 includes a pair of base rails 902 fixedly coupled to one another by a series of ladder rungs 906 and ladder rung supports 908. The lower middle section 900 includes a hand rail 910 having a top plate 912 and a gusset plate 914. The hand rails 910 are coupled to the corresponding base rails 902 by a series of angled lacing members 920. The middle section 1000 includes a pair of base rails 1002 fixedly coupled to one another by a series of ladder rungs 1006 and ladder rung supports 1008. The middle section 1000 includes a hand rail 1010 having a top plate 1012 and a gusset plate 1014. The hand rails 1010 are coupled to the corresponding base rails 1002 by a series of angled lacing members 1020. The upper middle section 1100 includes a pair of base rails 1102 fixedly coupled to one another by a series of ladder rungs 1106 and ladder rung supports 1108. The upper middle section 1100 includes a hand rail 1110 having a top plate 1112 and a gusset plate 1114. The hand rails 1110 are coupled to the corresponding base rails 1102 by a series of angled lacing members 1120.
As shown in FIG. 25, the lower middle section 900 receives the middle section 1000, the middle section 1000 receives the upper middle section 1100, and the upper middle section 1100 receives the fly section 1200. The top surfaces of the top plate 912, the top plate 1012, the top plate 1112, and the top plate 1212 are all level with one another (e.g., arranged in the same horizontal plane). In another embodiment, one or more of the top surfaces of the top plate 912, the top plate 1012, the top plate 1112, and the top plate 1212 are not level with one another (e.g., arranged in the same horizontal plane). To facilitate this arrangement, each ladder section is taller and wider than the ladder section that it directly supports. As such, the upper middle section 1100 is taller and wider than the fly section 1200, the middle section 1000 is taller and wider than the upper middle section 1100, and the lower middle section 900 is taller and wider than the middle section 1000.
Referring to FIGS. 24, 25, and 28, each ladder section directly supports or indirectly supports all of the ladder sections above it. By way of example, the lower middle section 900 supports the middle section 1000 directly as well as the upper middle section 1100 and the fly section 1200 indirectly. Accordingly, each sequential ladder section is configured to support a greater load. This is accomplished using structural members of greater size and thickness. An overall thickness of each top plate may be defined as the greatest distance between the top surface of the top plate and the bottom surface of the top plate as measured parallel to the vertical axis 736. As shown in FIG. 28, the overall thickness of the top plate 1112 is greater than that of the top plate 1212, the overall thickness of the top plate 1012 is greater than that of the top plate 1112, and the overall thickness of the top plate 912 is greater than that of the top plate 1012. The width (e.g., measured in a lateral direction) of each of the top plates may be the same. As shown in FIG. 28, the gusset plate 1114 is wider (e.g., measured in a lateral direction) than the gusset plate 1214, the gusset plate 1014 is wider than the gusset plate 1114, and the gusset plate 914 is wider than the gusset plate 1014. The height of each of the gusset plates (e.g., measured in a vertical direction) between the angled lacing members (e.g., at the midsections 1244) may be the same. The height of each of the gusset plates near the angled lacing members (e.g., at the interface sections 1242) may increase in each of the lower ladder sections.
The arrangement of the lacing members in the lower middle section 900, the middle section 1000, and the upper middle section 1100 may vary from that of the fly section 1200. By way of example, the lower middle section 900, the middle section 1000, and the upper middle section 1100 may include only angled lacing members and no vertical lacing members. By way of another example, the angled lacing members 1120, the angled lacing members 1020, and the angled lacing members 920 may have a rectangular cross section instead of a circular cross section. Additionally, the lower middle section 900, the middle section 1000, and the upper middle section 1100 may each include pulley support assemblies similar to the pulley support assemblies 1228. The fly section 1200 includes a pair of pulley support assemblies 1228 positioned near a lower end (e.g., an end opposite the distal end 704) of the fly section 1200. The lower middle section 900, the middle section 1000, and the upper middle section 1100 may each include two pairs of pulley support assemblies: one pair located at each end of the ladder section. The additional pulley support assemblies may support the cables 724 as they extend to the next ladder section.
Referring to FIGS. 22-25, 28, and 41, the base section 800 is shown according to an exemplary embodiment. The base section 800 may have a construction that is similar to that of the fly section 1200 except as otherwise stated herein. Accordingly, components in the base section 800 may be substantially similar to the components in the fly section 1200 having similar names. The base section 800 includes a pair of base rails 812 extending longitudinally. The base rails 812 may define apertures 814, through which cables, wires, or hoses may enter the base rails 812. The base rails 812 are fixedly coupled to one another by a series of ladder rungs 816 and ladder rung supports 818 extending between the base rails 812. A series of angled lacing members 830 and vertical lacing members 832 are coupled to and extend upward from the base rails 812.
The base section 800 includes a pair of hand rails 840 positioned above the base rails 812. The hand rails 840 each include a top plate 842, a top plate 844, and a top plate 846, each having a solid cross section. A first section 848 of the top plate 842 extends horizontally, and a second section 850 of the top plate 842 is bent downward and extends toward the distal end 704, engaging the top surface of the top plate 846. The top plate 844 engages the bottom surface of the first section 848 of the top plate 842 and extends downward toward the distal end 704. The top plate 846 engages the bottom surface of the top plate 842 and extends downward away from the distal end 704. The angled lacing members 830 and the vertical lacing members 832 engage and fixedly couple to bottom surfaces of the top plate 842, the top plate 844, and/or the top plate 846.
The hand rails 840 each further include a gusset plate 854 extending vertically between and fixedly coupled to the bottom surface of the top plate 842 and a top surface of the top plate 844. A gusset plate 856 extends along and fixedly couples to a bottom surface of the top plate 844, a bottom surface of the top plate 842, and a bottom surface of the top plate 846. A gusset plate 858 extends between and fixedly couples to a bottom surface of the top plate 842 and a top surface of the top plate 846. The gusset plate 858 defines an aperture extending laterally therethrough that acts as the actuator interface 804 (e.g., that is configured to receive a pin that engages the end 714 of a pivot actuator 710). The angled lacing members 830 and the vertical lacing members 832 define slots, notches, or grooves that receive the gusset plate 856. Accordingly, the angled lacing members 830 and the vertical lacing members 832 extend along each lateral side of the gusset plate 856 to engage the bottom surfaces of the of the top plate 842, the top plate 844, and/or the top plate 846. The angled lacing members 830 and the vertical lacing members 832 are fixedly coupled to the gusset plate 856.
Referring to FIGS. 24, 25, and 41, the aerial ladder assembly 700 includes a support series of support assemblies, shown as load transfer stations 2200, coupled to the base section 800, the lower middle section 900, the middle section 1000, and the upper middle section 1100. The load transfer stations 2200 slidably couple each ladder section to an adjacent ladder section, facilitating relative longitudinal movement (i.e., movement along the longitudinal axis 732) between each of the ladder sections. Specifically, a load transfer station 2200 slidably couples the lower middle section 900 to the base section 800. A load transfer station 2200 slidably couples the middle section 1000 to the lower middle section 900. A load transfer station 2200 slidably couples the upper middle section 1100 to the middle section 1000. A load transfer station 2200 slidably couples the fly section 1200 to the upper middle section 1100.
Each load transfer station 2200 includes a pair of first load-bearing bodies or load transfer sections, shown as front supports 2202, a pair of second load-bearing bodies or load transfer sections, shown as top rear supports 2204, and a pair of third load-bearing bodies or load transfer sections, shown as bottom rear supports 2206, arranged symmetrically about the center plane 738. The front supports 2202 are positioned at the front ends of the corresponding ladder sections (i.e., the end closest to the distal end 704). The top rear supports 2204 and the bottom rear supports 2206 are offset longitudinally rearward (i.e., away from the distal end 704) relative to the front supports 2202. In some embodiments, the top rear supports 2204 and the bottom rear supports 2206 are positioned in substantially the same longitudinal position. In other embodiments, the top rear supports 2204 and the bottom rear supports 2206 are longitudinally offset from one another.
The front supports 2202, top rear supports 2204, and bottom rear supports 2206 of certain ladder sections (e.g., the base section 800 and the middle section 1000) are shown in detail herein. It should be understood that similar arrangements may be utilized with any of the ladder sections described herein. When describing the load transfer stations 2200 generically, the ladder section to which the load transfer station 2200 is coupled (e.g., the lower ladder section, the base section 800, etc.) is referred to as the supporting ladder section, and the ladder section that the load transfer station 2200 slidably engages (e.g., the upper ladder section, the lower middle section 900, etc.) is referred to as the supported ladder section.
Referring to FIGS. 41-46, the load transfer stations 2200 each include a pair of first supports, shown as inner side plates 2210, a pair of second supports, shown as outer side plates 2212, and a pair of third supports, shown as base plates 2214. The inner side plates 2210 and the outer side plates 2212 each extend parallel to the center plane 738 and are laterally offset from one another. The base plates 2214 extend parallel to a horizontal plane. The inner side plates 2210 are fixedly coupled to one or more of the of the ladder rungs of the supporting ladder section. The outer side plates 2212 are fixedly coupled to the corresponding base rail, the corresponding hand rail, the corresponding vertical lacing members, and/or the corresponding angled lacing members of the supporting ladder section. The base plates 2214 are fixedly coupled to the corresponding base rail, the corresponding inner side plate 2210, and the corresponding outer side plate 2212 of the supporting ladder section.
FIGS. 41-44 illustrate the inner side plates 2210, the outer side plate 2212, and the base plates 2214 implemented with the base section 800. In this arrangement, the inner side plates 2210 are coupled to a pair of the ladder rungs 816 and are offset laterally inward of the base rails 812. The outer side plates 2212 are each coupled to an outer lateral surface (e.g., the outer lateral surface 2262) of the corresponding base rail 812, a bottom surface of the corresponding top plate 844, and an outer lateral surface of the corresponding gusset plate 856. The base plate 2214 is coupled to a bottom surface (e.g., the bottom surface 2264) of the corresponding base rail 812, a bottom surface of the corresponding inner side plate 2210, and a bottom surface of the corresponding outer side plate 2212.
FIGS. 45 and 46 illustrate the inner side plates 2210, the outer side plate 2212, and the base plates 2214 implemented with the base section 800. In this arrangement, the inner side plates 2210 are coupled to a pair of the ladder rungs 1006 and are offset laterally inward of the base rails 1002. The frontmost of the ladder rungs 1006 may extend only to inner side plates 2210 and not beyond the inner side plates 2210 to the base rails 1002. The outer side plates 2212 are coupled to a lateral surface of the corresponding base rail 1002, a bottom surface of one of the angled lacing members 1020, and front and back surfaces of one of the vertical lacing members 1022. In the embodiment shown in FIGS. 45 and 46, a laterally-inward section of the base rail 1002 is cut away, accommodating the placement of the outer side plate 2212. The base plate 2214 is coupled to a bottom surface (e.g., the bottom surface 2264) of the corresponding base rail 812, a bottom surface of one of the ladder rungs 1006, a bottom surface of the inner side plate 2210, and a bottom surface of the outer side plate 2212.
Referring to FIGS. 44 and 46, each pair of inner side plates 2210 and outer side plates 2212 defines a recess or aperture 2220 extending at least partially laterally therethrough. The apertures 2220 are configured to receive a cylindrical member, shown as pin 2222, (e.g., a bolt, a rod, a dowel pin, etc.). The pin 2222 extends laterally into and/or through both the inner side plate 2210 and the outer side plate 2212. The pin 2222 may be coupled to the inner side plate 2210 and/or the outer side plate 2212 (e.g., with a fastener) to prevent the pin 2222 from moving laterally.
Referring to FIG. 47, a front support 2202 is shown. The front support 2202 includes a frame 2230. The frame 2230 defines an aperture 2232 that extends laterally therethrough. The aperture 2232 is configured to receive the pin 2222. Accordingly, the pin 2222 pivotably couples the front support 2202 to the supporting ladder section. Because the pin 2222 and the aperture 2232 extend laterally, the front supports 2202 are both configured to rotate about an axis of rotation 2234 that extends laterally. The frame 2230 may include one or more bushings or bearings that define the aperture 2232 to facilitate rotation between the frame 2230 and the pin 2222.
The front support 2202 further includes a first plate, shown as top guide 2240, a second plate, shown as lateral guide 2242, and a third plate, shown as bottom guide 2244. The top guide 2240, the lateral guide 2242, and the bottom guide 2244 are each coupled to the frame 2230. The frame 2230 is “C” shaped such that the top guide 2240 defines a top engagement surface 2246, the lateral guide 2242 defines a side engagement surface 2248, and the bottom guide 2244 defines a bottom engagement surface 2250. The top engagement surface 2246 faces downward, the side engagement surface 2248 faces laterally inward, and the bottom engagement surface 2250 faces upward. The top engagement surface 2246 and the bottom engagement surface 2250 extend parallel to one another, and the side engagement surface 2248 extends perpendicular to the top engagement surface 2246 and the bottom engagement surface 2250. The top engagement surface 2246, the side engagement surface 2248, and the bottom engagement surface 2250 are substantially flat. In other embodiments, the top engagement surface 2246, the side engagement surface 2248, and the bottom engagement surface 2250 are otherwise shaped. In some embodiments, the top guide 2240, the lateral guide 2242, the bottom guide 2244 are separate components that are coupled (e.g., fastened, adhered, etc.) to the frame 2230. In other embodiments, one or more of the top guide 2240, the lateral guide 2242, the bottom guide 2244, and the frame 2230 are integrally formed as a single piece.
Referring to FIGS. 24 and 48, the top guide 2240, the lateral guide 2242, and the bottom guide 2244 together define a recess 2252 therebetween that receives a base rail (e.g., the base rail 1202) of the supported ladder section (e.g., the fly section 1200). Each base rail defines a top surface 2260, an outer lateral surface 2262, a bottom surface 2264, and an inner lateral surface 2266. The top engagement surfaces 2246 engage the top surfaces 2260 and the bottom engagement surfaces 2250 engage the bottom surfaces 2264, limiting upward and downward vertical movement of the supported ladder section relative to the front supports 2202. The side engagement surfaces 2248 engage the outer lateral surfaces 2262, limiting lateral movement of the supported ladder section in both lateral directions relative to the front supports 2202. The front supports 2202 may be sized and positioned such that each of these surfaces are engaged at all times, preventing vertical and lateral movement of the supported ladder section relative to the front supports 2202. Alternatively, the front supports 2202 may be sized and positioned such that spaces or gaps extend between some of these surfaces, facilitating some lateral or vertical movement of the supported ladder section relative to the front supports 2202.
The top guide 2240, the lateral guide 2242, and the bottom guide 2244 are configured to facilitate longitudinal sliding movement of the supported ladder section relative to the front supports 2202. The top guide 2240, the lateral guide 2242, and the bottom guide 2244 may be made from a material that has a low coefficient of friction when engaging the material of the base rails, facilitating sliding motion even under load. By way of example, the top guide 2240, the lateral guide 2242, and the bottom guide 2244 may be made from a hard plastic.
Because the front supports 2202 are pivotably coupled to the supporting ladder section, the front supports 2202 limit the upward and downward vertical movement and the lateral movement (e.g., in both lateral directions) of the supported ladder section relative to the supporting ladder section. However, the front supports 2202 facilitate longitudinal motion (e.g., both extension and retraction) of the supported ladder section relative to the supporting ladder section. The pivotable coupling of the front supports 2202 may additionally or alternatively facilitate maintaining a consistent distributed pressure across the load-bearing bodies or load transfer sections. The pivotable coupling of the front supports 2202 may additionally or alternatively facilitate maintaining a parallel arrangement between the front supports 2202 (e.g., a bottom surface thereof, an inner surface thereof, etc.) and the supported ladder section (e.g., the bottom of the supported ladder section, etc.).
Referring to FIGS. 24, 41, 49, and 50, the load transfer stations 2200 further include a pair of supports, shown as side plate assemblies 2270. The side plate assemblies 2270 extend substantially parallel to the center plane 738 and are symmetrically arranged about the center plane 738. The side plate assemblies 2270 are fixedly coupled to the base rails, the angled lacing members, and/or the vertical lacing members of the supporting ladder section. Each side plate assembly 2270 defines an aperture 2272 extending laterally therethrough. The apertures 2272 of each load transfer station 2200 define an axis of rotation 2274 that extends laterally through the center of each aperture 2272.
Referring to FIGS. 41 and 49, the base section 800 includes a pair of side plate assemblies 2270. In the base section 800, the side plate assemblies 2270 each include a pair of side plates 2280. The side plates 2280 are each fixedly coupled to the base rail 812. One of the side plates 2280 is fixedly coupled to the inner lateral surfaces of one of the angled lacing members 830 and one of the vertical lacing members 832. The other side plate 2280 is fixedly coupled to the outer lateral surfaces of that angled lacing member 830 and that vertical lacing member 832. The side plates 2280 may define the aperture 2272 directly, or the side plates 2280 may define apertures that receive a bushing that defines the aperture 2272.
Referring to FIG. 50, the middle section 1000 includes a pair of side plate assemblies 2270. These side plate assemblies 2270 each include a side plate 2280 that is fixedly coupled to the inner lateral surfaces of the base rail 1002 and a pair of the angled lacing members 1020. A boss 2282 is fixedly coupled to an outer lateral surface of the side plate 2280. The side plate 2280 and the boss 2282 may define the aperture 2272 directly, or the side plate 2280 and the boss 2282 may define apertures that receive a bushing that defines the aperture 2272.
Referring to FIGS. 49, 50, and 51, the top rear supports 2204 are shown. Each top rear support 2204 includes a frame 2290. The frame 2290 defines an aperture 2292 that extends laterally therethrough. The aperture 2292 is configured to receive a pin 2294 that passes into the aperture 2272 of one of the side plate assemblies 2270. Accordingly, the pin 2294 pivotably couples the top rear support 2204 to the supporting ladder section. Because the pin 2294 and the aperture 2272 extend laterally, the top rear supports 2204 are both configured to rotate about the axis of rotation 2274. The frame 2290 may include one or more bushings or bearings that define the aperture 2292 to facilitate rotation between the frame 2290 and the pin 2294. Alternatively, the pin 2294 may be fixedly coupled to either the side plate assembly 2270 or the frame 2290.
The top rear support 2204 further includes a first plate, shown as top guide 2300, and a second plate, shown as lateral guide 2302. The top guide 2300 and the lateral guide 2302 are each coupled to the frame 2290. The frame 2230 is “L” shaped such that the top guide 2300 defines a top engagement surface 2304 and the lateral guide 2302 defines a side engagement surface 2306. The top engagement surface 2304 faces downward and the side engagement surface 2306 faces laterally inward. The side engagement surface 2306 extends perpendicular to the top engagement surface 2304. The top engagement surface 2304 and the side engagement surface 2306 are substantially flat. In other embodiments, the top engagement surface 2304 and the side engagement surface 2306 are otherwise shaped. In some embodiments, the top guide 2300 and the lateral guide 2302 are separate components that are coupled (e.g., fastened, adhered, etc.) to the frame 2290. In other embodiments, one or more of the top guide 2300 and the lateral guide 2302, and the frame 2230 are integrally formed as a single piece.
Referring to FIGS. 49 and 50, the load transfer stations 2200 further include a pair of supports, shown as brackets 2310. The brackets 2310 extend substantially horizontally and are symmetrically arranged about the center plane 738. The brackets 2310 are fixedly coupled to the base rails and/or the ladder rungs of the supporting ladder section. Each bracket 2310 is configured to couple to one of the bottom rear supports 2206.
Referring to FIG. 49, in the base section 800, the brackets 2310 are fixedly coupled to a top surface (e.g., the top surface 2260) of the corresponding base rail 812 and a front surface of one of the ladder rungs 816. Referring to FIG. 50, in the middle section 1000, the brackets 2310 are fixedly coupled to an inner lateral surface (e.g., the inner lateral surface 2266) of the corresponding base rail 1002 and a front surface of one of the ladder rungs 1006. Additionally, each bracket 2310 is fixedly coupled to a top surface of a plate 2312 that extends along a bottom surface of the ladder rungs 1006.
Referring to FIGS. 49-51, the bottom rear supports 2206 are shown. Each bottom rear support 2206 includes a first plate, shown as frame 2320, coupled to the bracket 2310. The frame 2320 may be fixedly coupled to the bracket 2310 or pivotably coupled to the bracket 2310 (e.g., such that the bottom rear supports 2206 rotate about a lateral axis). The bottom rear support 2206 further includes a second plate, shown as bottom guide 2322, coupled to a top surface of the frame 2320. The bottom guide 2322 defines a bottom engagement surface 2324 that faces upward. The bottom engagement surface 2324 is substantially flat. In other embodiments, the bottom engagement surface 2324 is otherwise shaped. In some embodiments, the bottom guide 2322 is a separate component that is coupled (e.g., fastened, adhered, etc.) to the frame 2320. In other embodiments, the bottom guide and the frame 2320 are integrally formed as a single piece.
Referring to FIGS. 24 and 51, the top guide 2300, the lateral guide 2302, and the bottom guide 2322 receive a base rail (e.g., the base rail 1202) of the supported ladder section (e.g., the fly section 1200) therebetween. The top engagement surfaces 2304 engage the top surfaces 2260, limiting upward vertical movement of the supported ladder section relative to the top rear supports 2204. The bottom engagement surfaces 2324 engage the bottom surfaces 2264, limiting downward vertical movement of the supported ladder section relative to the bottom rear supports 2206. The side engagement surfaces 2306 engage the outer lateral surfaces 2262, limiting lateral movement of the supported ladder section relative to the top rear supports 2204. The top rear supports 2204 may be sized and positioned such that the outer lateral surfaces 2262 are engaged at all times, preventing lateral movement of the supported ladder section relative to the top rear supports 2204. Alternatively, the top rear supports 2204 may be sized and positioned such that spaces or gaps extend between the outer lateral surfaces 2262 and the side engagement surfaces 2306, facilitating some lateral movement of the supported ladder section relative to the top rear supports 2204. The top rear supports 2204 and the bottom rear supports 2206 are sized and positioned such that a distance between the top engagement surface 2304 and the bottom engagement surface 2324 is greater than a distance between the top surface 2260 and the bottom surface 2264 of the base rail, providing a space between the base rail and one of the top rear support 2204 and the bottom rear support 2206.
The top guide 2300, the lateral guide 2302, and the bottom guide 2322 are configured to facilitate longitudinal sliding movement of the supported ladder section relative to the top rear supports 2204 and the bottom rear supports 2206. The top guide 2300, the lateral guide 2302, and the bottom guide 2322 may be made from a material that has a low coefficient of friction when engaging the material of the base rail, facilitating sliding motion even under load. By way of example, the top guide 2300, the lateral guide 2302, and the bottom guide 2322 may be made from a hard plastic.
In operation, the aerial ladder assembly 700 extends and retracts. Accordingly, each supported ladder section moves longitudinally relative to the supporting ladder section between a retracted position and an extended position. In the retracted position, the collective center of gravity of the supported ladder section and everything supported by it is positioned longitudinally rearward of the front support 2202. In some embodiments, in the retracted position, the collective center of gravity is positioned longitudinally rearward of the bottom rear supports 2206. In such a configuration, the supported ladder section engages and is supported by the top guides 2240 of the front supports 2202 and the bottom guides 2322 of the bottom rear supports 2206. The front supports 2202 rotate until the top engagement surfaces 2246 are parallel to the corresponding top surfaces 2260. Accordingly, the top guides 2240 engage the base rails along their entire lengths, spreading the force exerted by the front supports 2202 out over an area. In some embodiments, the bottom engagement surfaces 2324 are also parallel to the bottom surfaces 2264 such that the bottom guides 2322 engage the base rails along their entire lengths.
As the aerial ladder assembly 700 extends outward, the collective center of gravity moves longitudinally between the front supports 2202 and the bottom rear supports 2206. In other embodiments, the collective center of gravity is positioned longitudinally between the front supports 2202 and the bottom rear supports 2206 when the supported ladder section is in the retracted position. In this configuration, the supported ladder section engages and is supported by the bottom guides 2244 of the front supports 2202 and the bottom guides 2322 of the bottom rear supports 2206. The front supports 2202 may rotate until the bottom engagement surfaces 2250 are parallel to the corresponding bottom surfaces 2264. Accordingly, the bottom guides 2244 engage the base rails along their entire lengths, spreading the force exerted by the front supports 2202 out over an area. In some embodiments, the bottom engagement surfaces 2324 are also parallel to the bottom surfaces 2264 such that the bottom guides 2322 engage the base rails along their entire lengths.
As the aerial ladder assembly 700 extends further outward, the collective center of gravity moves longitudinally forward of the front supports 2202. In this configuration, the supported ladder section engages and is supported by the bottom guides 2244 of the front supports 2202 and the top guides 2240 of the top rear supports 2204. When moving into this configuration, the supported ladder section rotates until the supported ladder section engages the top rear supports 2204. The front supports 2202 rotate about the axis of rotation 2234 such that the bottom engagement surfaces 2250 remain parallel to the bottom surfaces 2264 throughout this movement. As the supported ladder section engages the top rear supports 2204, the top rear supports 2204 rotate until the top engagement surfaces 2304 are parallel to the corresponding top surfaces 2260. Accordingly, the top guides 2300 engage the base rails along their entire lengths, spreading the force exerted by the top rear supports 2204 out over an area. The aerial ladder assembly 700 may then extend in this configuration until the supported ladder section is in the extended position.
Conventional load transfer stations not include rotating supports. Instead, the supports are fixed to the supporting ladder section. This causes the supports to exert forces on the supported ladder section over a very small area (e.g., as a point load) as the supported ladder section rotates. This introduces large stresses into the supported ladder section. In contrast, the front support 2202 and the top rear support 2204 rotate until the surface area of the support contacting the supported ladder section is maximized. This reduces stresses and wear on the aerial ladder assembly 700, increasing the working life of the fire apparatus 10. Additionally, the reduced stresses facilitate reducing the weight of the load transfer stations.
The top surface 2260, the outer lateral surface 2262, the bottom surface 2264, and the inner lateral surface 2266 may include multiple individual segments. In an alternative embodiment shown in FIGS. 52 and 53, the top surface 2260 of the base rail 1202 includes a first horizontal portion that engages the top engagement surface 2246 and the top engagement surface 2304, a second horizontal portion positioned above the first horizontal portion that engages a vertical lacing member 1222, and an angled portion extending between the first horizontal portion and the second horizontal portion. Accordingly, the top surface 2260 is the uppermost surface of the base rail 1202.
In some alternative embodiments, the pin 2222 and the pin 2294 are omitted, and the front support 2202 and the top rear support 2204 are otherwise pivotably coupled to the supporting ladder section. By way of example, the front supports 2202 may be pivotably coupled to the base rails of the supporting ladder section through first compliant mounts, and the top rear supports 2204 may be pivotably coupled to the base rails of the supporting ladder section through second compliant mounts. The compliant mounts are configured to elastically deform under loading, facilitating rotation of the front support 2202 and the top rear support 2204 relative to the supporting ladder section. The compliant mounts may be made of rubber, a series of compression springs, or another structure capable of elastic deformation.
Referring to FIGS. 54-57, a pin 2400 is shown as alternative embodiment of the pin 2294. The pin 2400 may be substantially similar to the pin 2294 except as otherwise stated herein. The pin 2400 includes a first portion, shown as mounting flange 2402, a second portion or shaft, shown as side plate portion 2404, and a third portion or shaft, shown as support portion 2406. The side plate portion 2404 is positioned between the mounting flange 2402 and the support portion 2406. When installed, the mounting flange 2402 engages an outer surface of the base section 800, the side plate portion 2404 extends through the aperture 2272 defined by the side plate assembly 2270, and the support portion 2406 extends through the aperture 2232 defined by the top rear support 2204. The pin 2400 pivotally couples the top rear support 2204 to the side plate assembly 2270.
The mounting flange 2402 and the support portion 2406 are substantially axially aligned. The mounting flange 2402 defines a series of apertures, shown as mounting apertures 2410. The mounting apertures 2410 are arranged in a substantially circular pattern centered around the side plate portion 2404. As shown, the mounting flange 2402 defines eight mounting apertures 2410, and the mounting apertures 2410 are equally spaced. In other embodiments, the mounting apertures 2410 are otherwise spaced and/or the mounting flange 2402 defines more or fewer mounting apertures 2410.
The side plate portion 2404 extends along and is substantially centered about an axis, shown as central axis 2420. The support portion 2406 extends along and is substantially centered about an axis, shown as central axis 2422. The central axis 2420 is offset from the central axis 2422 such that the side plate portion 2404 is substantially parallel to, but not aligned with, the support portion 2406. Specifically, the central axis 2420 is offset from the central axis 2422 by a distance DO.
The mounting apertures 2410 are each configured to receive a mounting fastener or pin, shown as fastener 2430. The fasteners 2430 are removably coupled to (e.g., received within, in threaded engagement with, etc.) a pair of first inserts, shown as threaded inserts 2432. A pair of second inserts, shown as spacers 2434, engage an outer surface of the top rear support 2204 to prevent the top rear support 2204 from scraping against the side plate assembly 2270. The threaded inserts 2432 and the spacers 2434 are received within a pair of apertures 2440 defined by the side plate assembly 2270 (e.g., by a bushing of the side plate assembly 2270). The threaded inserts 2432 and the spacers 2434 may be fixedly coupled (e.g., pressed into, welded, adhered, etc.) to the side plate assembly 2270. Accordingly, the fasteners 2430 selectively couple the pin 2400 to the side plate assembly 2270.
In operation, the pin 2400 facilitates adjustment of the vertical position of the top rear support 2204 relative to the base rail 812. This facilitates adjustment of the amount of vertical movement of the base rail 902 that is permitted between the top rear support 2204 and the bottom rear support 2206. To adjust this spacing, the fasteners 2430 are removed, permitting rotation of the pin 2400 relative to the side plate assembly 2270. When the pin 2400 is rotated, the central axis 2420 remains substantially centered within the aperture 2272, while the central axis 2422 rotates about the central axis 2420. In total, the vertical position of the top rear support 2204 may be varied by a distance of up to twice the distance DO. When the top rear support 2204 is in the desired position, the fasteners 2430 may be inserted into the mounting apertures 2410 that align with the apertures 2440, fixing the orientation of the pin 2400.
Although the pin 2400 has been described as coupling the top rear support 2204 to the base section 800, it should be understood that the pin 2400 may be used to couple one or both of the top rear supports 2204 to any of the ladder sections. Similarly, a pin 2400 may be used to couple one or both of the front supports 2202 to any of the ladder sections.
1. A fire apparatus comprising:
a plurality of axles coupled to the chassis;
a turntable rotatably coupled to the chassis; and
an aerial ladder assembly pivotably coupled the turntable, the aerial ladder assembly comprising:
a first ladder section extending longitudinally;
a second ladder section extending longitudinally;
a first support slidably coupling the second ladder section to the first ladder section such that the first ladder section supports the second ladder section; and
a second support pivotably coupled to the first ladder section;
wherein the support facilitates longitudinal movement of the second ladder section relative to the first ladder section between an extended position and a retracted position, and wherein the support is pivotably coupled to the first ladder section; and
the second support is positioned rearward of the first support, and the second support is configured to slidably engage the second ladder section when the second ladder section is in the extended position; or
the aerial ladder assembly further comprises a third support coupled to the first ladder section, the first support is configured to limit both upward vertical movement and downward vertical movement of the second ladder section relative to the first ladder section, the second support is configured to limit upward vertical movement of the second ladder section relative to the first ladder section, and the third support is configured to limit downward vertical movement of the second ladder section relative to the first ladder section.
2. The fire apparatus of claim 1, wherein the first support is configured to limit both upward vertical movement and downward vertical movement of the second ladder section relative to the first ladder section.
3. The fire apparatus of claim 1, further comprising the third support coupled to the first ladder section, wherein the third support is configured to slidably engage the second ladder section when the second ladder section is in the retracted position, and wherein the second support is configured to pivot relative to the third support.
4. The fire apparatus of claim 1, wherein at least one of the first support or the second support are configured to slidably engage the second ladder section to limit lateral movement of the second ladder section relative to the first ladder section.
5. The fire apparatus of claim 1, wherein the second ladder section includes:
a base rail extending longitudinally, the base rail having a bottom surface;
a plurality of lacing members coupled to the base rail and extending above the base rail;
a plurality of ladder rungs coupled to the base rail and extending laterally inward relative to the base rail;
wherein the first support defines a first engagement surface configured to engage the bottom surface of the base rail.
6. The fire apparatus of claim 5, wherein the base rail has an outer lateral surface opposite the ladder rungs, wherein the outer lateral surface is offset laterally outward of each of the lacing members.
7. The fire apparatus of claim 6, wherein the base rail has a top surface opposite the bottom surface, wherein the lacing members are coupled to the top surface of the base rail, and wherein the support further defines:
a second engagement surface configured to engage the top surface of the base rail; and
a third engagement surface configured to engage the outer lateral surface of the base rail.
8. The fire apparatus of claim 5, wherein the second support is positioned rearward of the first support, and wherein the second support defines a second engagement surface configured to engage a top surface of the base rail.
9. The fire apparatus of claim 8, further comprising the third support coupled to the first ladder section, wherein the third support defines a third engagement surface configured to engage the bottom surface of the base rail.
10. The fire apparatus of claim 9, wherein the first engagement surface, the second engagement surface, and the third engagement surface are each substantially flat.
11. An aerial ladder assembly for a fire apparatus, the aerial ladder assembly comprising:
a second ladder section extending longitudinally and selectively repositionable relative to the first ladder section in a longitudinal direction between an extended position and a retracted position;
a first support coupled to the first ladder section;
a second support coupled to the first ladder section and longitudinally offset from the first support; and
a third support coupled to the first ladder section and configured to limit downward vertical movement of the second ladder section;
wherein the first support and the second support slidably couple the second ladder section to the first ladder section, wherein the first support is configured to limit downward vertical movement of the second ladder section, wherein the second support is configured to limit upward vertical movement of the second ladder section, and wherein at least one of (a) the first support is pivotable relative to the first ladder section about a first lateral axis or (b) the second support is pivotable relative to the first ladder section about a second lateral axis.
12. The aerial ladder assembly of claim 11, wherein the first support is configured to limit upward vertical movement of the second ladder section.
13. The aerial ladder assembly of claim 12, wherein the first support is pivotable relative to the first ladder section about the first lateral axis, wherein the second support is pivotable relative to the first ladder section about the second lateral axis, and wherein the second support is pivotable relative to the third support.
14. A load transfer station for an aerial ladder assembly of a fire apparatus, wherein the aerial ladder assembly includes a first ladder section and a second ladder section, the load transfer station comprising:
a first support configured to be pivotably coupled to the first ladder section, the first support defining a first engagement surface; and
a second support configured to be pivotably coupled to the first ladder section, the second support defining a second engagement surface;
wherein the first engagement surface is configured to slidably engage a bottom surface of a base rail of the second ladder section to limit downward vertical movement of the second ladder section when the aerial ladder assembly is in an extended configuration, and wherein the second engagement surface is configured to slidably engage a top surface of the base rail to limit upward vertical movement of the second ladder section when the aerial ladder assembly is in the extended configuration.
15. The load transfer station of claim 14, wherein the first support is configured to pivot about a first lateral axis and wherein the second support is configured to pivot about a second lateral axis that is longitudinally offset from the first lateral axis.
16. The load transfer station of claim 15, further comprising a third support configured to be coupled to the first ladder section, the third support defining a third engagement surface, wherein the third engagement surface is configured to slidably engage the bottom surface of the base rail when the aerial ladder assembly is in a retracted configuration.
17. The load transfer station of claim 16, wherein the first support further defines a fourth engagement surface, and wherein the fourth engagement surface is configured to slidably engage the top surface of the base rail when the aerial ladder assembly is in the retracted configuration.
18. A fire apparatus comprising:
a second ladder section extending longitudinally, wherein the second ladder section includes:
a base rail extending longitudinally, the base rail having a bottom surface, a top surface opposite the bottom surface, and an outer lateral surface;
a plurality of lacing members coupled to the top surface of the base rail and extending above the base rail, wherein the outer lateral surface is offset laterally outward of each of the lacing members; and
a plurality of ladder rungs coupled to the base rail opposite the outer lateral surface of the base rail and extending laterally inward relative to the base rail; and
a support slidably coupling the second ladder section to the first ladder section such that the first ladder section supports the second ladder section, wherein the support defines (a) a first engagement surface configured to engage the bottom surface of the base rail, (b) a second engagement surface configured to engage the top surface of the base rail, and (c) a third engagement surface configured to engage the outer lateral surface of the base rail; and
wherein the support facilitates longitudinal movement of the second ladder section relative to the first ladder section between an extended position and a retracted position, and wherein the support is pivotably coupled to the first ladder section.
US16/389,600 2018-04-23 2019-04-19 Load transfer stations Active US10458182B1 (en)
US201862661414P true 2018-04-23 2018-04-23
US16/389,600 US10458182B1 (en) 2018-04-23 2019-04-19 Load transfer stations
US16/664,393 US20200056426A1 (en) 2018-04-23 2019-10-25 Load transfer stations
US16/664,393 Continuation US20200056426A1 (en) 2018-04-23 2019-10-25 Load transfer stations
US10458182B1 true US10458182B1 (en) 2019-10-29
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US16/389,600 Active US10458182B1 (en) 2018-04-23 2019-04-19 Load transfer stations
US16/664,393 Pending US20200056426A1 (en) 2018-04-23 2019-10-25 Load transfer stations
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