A turntable for a ladder assembly of a fire apparatus includes a base plate, a first set of side plates coupled to the base plate, a second set of side plates coupled to the base plate, a first bracket coupled to the base plate, a second bracket coupled to the base plate, a subfloor assembly releasably coupled to the first bracket and the second bracket with a plurality of fasteners, and a work platform coupled to the subfloor assembly. The first set of side plates extend vertically upward from a first side of the base plate. The second set of side plates extend vertically upward from an opposing second side of the base plate. The first bracket extends rearward from the base plate proximate the first side thereof. The second bracket extends rearward from the base plate proximate the opposing second side thereof.

A support structure for a ladder assembly of a fire apparatus includes a torque box, a pedestal, and a support plate. The torque box includes a top surface defining an aperture. The pedestal has (i) a lower end received by the aperture of the torque box and (ii) an upper end configured to couple to the ladder assembly. The support plate is positioned along the top surface of the torque box. The support plate includes a first leg and a second leg. The first leg extends from a first side of the support plate and is configured to engage with a first rail of the fire apparatus. The second leg extends from an opposing second side of the support plate and is configured to engage with a second frame rail of the fire apparatus.

A ladder assembly includes a ladder and a basket. The ladder has a first end and an opposing second end configured to couple to the fire apparatus. The basket is coupled to the first end of the ladder. The basket includes a subfloor frame assembly, a floor panel coupled to the subfloor frame assembly, and an upper frame assembly extending upward from and around a periphery of the floor panel. The upper frame assembly includes a front portion, a rear portion, opposing side portions coupled to the rear portion; and a pair of doors extending between the front portion and the opposing side portions. The pair of doors are positioned proximate front corners of the basket and oriented at an angle relative to the front portion and the opposing side portions.

An accessory mount system is provided for mounting on an aerial work platform having sidewalls extending upwardly from a base to a rim or lip. The mount system is configured to be releasably attached to the lip and one or more of the sidewalls of the work platform and includes quick-connect accessory mounts that allow various types of accessories or accessory mount/holders to be mounted on the system and, via the system, on to the work platform. The system can include a quick-connect mechanism for releasably mounting an accessory to the system. The quick-connect mechanism includes a catch mounted to a frame to pivot between a release position and a lock position and a user actuated release lever connected to the catch to allow a user to actuate the catch from the lock position to the release position.

A system and method using at least one inductor operatively coupled to an electrically insulating structure suppresses transient currents generated during a bond-on process by a human worker with energized electrical equipment so as to inhibit passage of the transient currents through the electrically insulating structure operatively coupled to the energized electrical equipment.

An improved building access system includes a turntable having an upper surface and a lower surface, a main tower attached to the turntable's upper surface, a boom tower pivotally attached to the turntable and disposed so as to form an angle with the main tower, and a balancing tower also pivotally attached to the turntable and also disposed so as to form an angle with the main tower. It also includes means for changing these angles between the main tower and, respectively, the boom tower and the balancing tower, and a cathead pivotally attached to the end of the boom tower which is opposite the end attached to the turntable. The inventive apparatus also includes pressure sensing devices located and disposed so as to measure the pressure at each mounting point where the main tower is attached to the turntable, along with one or more leveling rods disposed so that, as the boom tower is raised upwardly and the angle between the main tower and the boom tower decreases in value by an associated amount, the angle between the cathead and the boom tower decreases in value by the same amount. The turntable may further include at least one support arm configured so that the bending forces experienced by the turntable are transferred to a larger diameter support structure. The invention also includes an elongated beam member which is especially useful for forming box beams, which member has a pair of symmetrical planar side elements which are perpendicular to each other and which are also connected together by a diagonal element.

A lift device comprises a base, a retractable lift mechanism, a work platform, a linear actuator, and a lift controller. The base has a plurality of wheels. The retractable lift mechanism has a first end coupled to the base and is moveable between an extended position and a retracted position. The work platform is configured to support a load. The work platform is coupled to and supported by a second end of the retractable lift mechanism. The linear actuator is configured to selectively move the retractable lift mechanism between the extended position and the retracted position. The lift controller is configured to monitor at least one lift characteristic associated with the linear actuator and to determine whether an actuator failure has been detected based on the at least one lift characteristic associated with the linear actuator.

A boom assembly according to the disclosure may include a lower boom structure, and an upper boom structure that is connected to the lower boom structure. In addition, the boom assembly may include a counterweight movably mounted on one of the boom structures and movable along the one boom structure when at least a portion of the lower boom structure is moved relative to the upper boom structure or when at least a portion of the upper boom structure is moved relative to the lower boom structure.

A selector control that is manually operable by a user for activating or deactivating a primary control or a secondary control. The selector control may include a first state for activating the primary control and deactivating the secondary control, a second state for activating the secondary control and deactivating the primary control, and a failsafe state for deactivating both the primary control and the secondary control. The selector control may be configured to maintain the second state independent of continuous user input being applied to the selector control, and configured to maintain the first state when continuous user input is applied to the selector control. The selector control is normally biased toward the failsafe state such that the selector control automatically selects the failsafe state when the user discontinues applying the user input for maintaining the first state. The selector control has particular application for use in controlling a boom of a work vehicle.

A lift device includes a chassis having a first end and an opposing second end, a first actuator coupled to the first end, a second actuator coupled to the first end, a third actuator coupled to the opposing second end; and a fourth actuator coupled to the opposing second end. The first actuator and the second actuator are selectively engageable to facilitate providing active control of a first pitch adjustment and a first roll adjustment of the first end of the chassis. The third actuator and the fourth actuator are (i) selectively fluidly couplable to facilitate providing passive control of a second pitch adjustment and a second roll adjustment of the opposing second end of the chassis and (ii) selectively fluidly decouplable to facilitate providing active control of the second pitch adjustment and the second roll adjustment of the opposing second end of the chassis.