Abstract: A cylinder prop assembly is cooperable with a lift cylinder for a scissor lift and includes a cylinder prop displaceable between a disengaged position, in which the cylinder rod is movable relative to the cylinder housing, and an engaged position in which the cylinder rod is locked from displacement relative to the cylinder housing. An actuation lever is coupled with the cylinder prop and is accessible to displace the cylinder prop between the disengaged position and the engaged position.

Abstract: A work platform for a personnel lift includes a floor structure, a safety rail coupled with the floor structure and defining a personnel work area, and a control panel area. A protection envelope surrounds the control panel area and enhances protection for an operator from an obstruction or structure that may constitute a crushing hazard. In one arrangement, the protection envelope includes protection bars on either side of the control panel area extending above the safety rail relative to the floor structure. In another arrangement, the protection envelope includes a platform switch that is configured to trip upon an application of a predetermined force.

Abstract: A mast lift includes a base and a telescoping mast coupled with the base and extending upward from the base. The telescoping mast has a support section fixed to the base and a movable section movably connected and displaceable relative to the support section between a retracted position and an extended position. A top cap is secured to the movable section, and a platform is supported by the top cap and the movable section. A gas strut acts between the support section and the movable section and biases the movable section toward the extended position. A threaded driving rod is connected between the top cap and the base and extends through a fixed nut assembly.

Abstract: A cylinder length sensor mounting and retaining assembly for a hydraulic cylinder includes a casing attachable to a blind end of the cylinder, a sensor retention cap affixable to the casing adjacent the blind end of the cylinder, and a locking pin extendable through the casing and positioned adjacent the sensor retention cap. The assembly facilitates sensor removal without requiring disassembly of the cylinder.

Abstract: A longitudinal stability monitoring system controls a boom lift down speed for a lift vehicle. The lift vehicle includes a vehicle chassis supported on front and rear wheels respectively coupled with a front axle and a rear axle, and a boom pivotally coupled to the lift vehicle. The system monitors a vertical load on the rear axle and manages boom lift down speed based on the vertical load. Additionally, the system may manage the boom lift down speed based on both the vertical load on the rear axle and an anticipated operator demand according to a signal from an operator input device.

Abstract: A self-propel accessory provides an easily attachable optional drive function for a platform device. The platform device is supported by a device frame including a wheel at a rear end and a post at a front end. The self-propel accessory includes an accessory frame attachable to the device frame via a bracket, a driving wheel connected to the accessory frame, a motor operatively coupled with the driving wheel, and a handle connected to the accessory frame. The accessory frame is pivotable between a disengaged position and an engaged position, and a weight of the platform device biases the accessory frame toward the disengaged position.

Abstract: A pivoting axle system for an aerial lift vehicle with a chassis includes a left axle supporting a left wheel and a right axle supporting a right wheel. The left and right axles are pivotable between a transport position and a working position. A first hydraulic cylinder is connected at one end to the chassis on a right side of a vehicle center line and at an opposite end to the left axle, and a second hydraulic cylinder is connected at one end to the chassis on a left side of the vehicle center line and at an opposite end to the right axle. In the working position, the first and second hydraulic cylinders are prevented from deflection beyond a yield point.

Abstract: A carriage frame includes first and second side members supporting a floating fork pin, where the floating fork pin is movably mounted in respective fork pin slots in the first and second side members and is adapted to receive load carrying forks. The first and second side members each includes a locking aperture positioned spaced from the fork pin slots. A pair of lock plates are secured to ends of the floating fork pin, respectively, where each of the lock plates includes a lock pin slot and a lock pin hole positioned in substantial alignment with the locking apertures in the first and second side members. A pair of fork pin locks extend through the locking apertures of the first and second side members and are selectively extended through one of the lock pin slot and the lock pin hole.

Abstract: A split grip control lever is suitable for operating heavy machinery and includes a fixed base portion that provides secure operator support during operation of the machine. A movable upper portion is pivotable relative to the fixed base portion by the user's thumb and index finger to control operation of machine components. The movable upper portion and the fixed base portion preferably define a substantially continuous profile. Additionally, a control device is placed inside the fixed base portion of the grip, allowing for a shorter control shaft that pivots at or near the center of the unit. This arrangement facilitates control of the equipment.

Abstract: A pivoting axle system for an aerial lift vehicle includes a plurality of axles pivotally secured to the vehicle chassis at respective pivot points between a stowed position and a working position. Each axle is coupleable with a wheel assembly at distal ends thereof. Actuators are connected between the chassis and each of the plurality of axles, respectively, where the actuators are connected to the chassis at positions spaced from the pivot points, respectively. Additionally, each of the plurality of axles is independently controllable.

Abstract: A self-propel accessory provides an easily attachable optional drive function for a platform device. The platform device is supported by a device frame including a wheel at a rear end and a post at a front end. The self-propel accessory includes an accessory frame attachable to the device frame via a bracket, a driving wheel connected to the accessory frame, a motor operatively coupled with the driving wheel, and a handle connected to the accessory frame. The accessory frame is pivotable between a disengaged position and an engaged position, and a weight of the platform device biases the accessory frame toward the disengaged position.

Abstract: A mast lift includes a base, a platform, and a lifting assembly connected between the base and the platform. The lifting assembly moves the platform between a lowered position and a raised position. A threaded driving rod is connected between the base and the lifting assembly, and a gas strut acts between the base and the lifting assembly and biases the lifting assembly and the platform toward the raised position.

Abstract: A pothole protection assembly is cooperable with a support base of a scissor lift. The support base includes front wheels, rear wheels and a chassis. The pothole protection assembly includes a pair of front pothole bars fixed to the chassis and each positioned adjacent the front wheels, respectively, and a pair of rear pothole bars fixed to the chassis and each positioned adjacent the rear wheels, respectively. A space between the front wheels and the rear wheels defines a ground clearance zone, where the front pothole bars and the rear pothole bars are disposed at opposing ends of the ground clearance zone. The assembly is constructed and arranged to maximize a breakover angle in a scissor lift with fixed pothole protection.

Abstract: A multiple envelope control system and method expands the operating capabilities of a lift vehicle. The vehicle includes a platform mounted to a telescoping main boom. The main boom is configured for lift/lower function and telescope function. The multiple envelope control system includes a selector switch for selecting between a plurality of capacity modes including at least a low load mode and a high load mode. A plurality of sensors are strategically positioned on the main boom to cooperatively define position zones of the platform. A control system determines in which position zone the platform located according to signals from the plurality of sensors. The control system controls an envelope of the platform based on a position of the selector switch. By strategically positioning the sensors to define the position zones, inexpensive switches, such as limit switches or the like, can be used, thereby reducing manufacturing costs of the machine.

Abstract: A lift system is coupled between a work platform and a mast on a mast lift. The lift system includes an overload clutch that slips upon an overload on the lift system, an overrun brake that prevents the lift system from running beyond a fully lowered position and that prevents the lift system from running if the platform is hung up, and an emergency brake. The lift system is safe and lightweight and is effective for controlling a position of the work platform on the mast.

Abstract: A pivoting axle system for an aerial lift vehicle includes a plurality of axles pivotally secured to the vehicle chassis at respective pivot points between a stowed position and a working position. Each axle is coupleable with a wheel assembly at distal ends thereof. Actuators are connected between the chassis and each of the plurality of axles, respectively, where the actuators are connected to the chassis at positions spaced from the pivot points, respectively. Additionally, each of the plurality of axles is independently controllable.

Abstract: A longitudinal stability monitoring system controls a boom lift down speed for a lift vehicle. The lift vehicle includes a vehicle chassis supported on front and rear wheels respectively coupled with a front axle and a rear axle, and a boom pivotally coupled to the lift vehicle. The system monitors a vertical load on the rear axle and manages boom lift down speed based on the vertical load. Additionally, the system may manage the boom lift down speed based on both the vertical load on the rear axle and an anticipated operator demand according to a signal from an operator input device.

Abstract: A work platform for a personnel lift includes a floor structure, a safety rail coupled with the floor structure and defining a personnel work area, and a control panel area. A protection envelope surrounds the control panel area and enhances protection for an operator from an obstruction or structure that may constitute a crushing hazard. In one arrangement, the protection envelope includes protection bars on either side of the control panel area extending above the safety rail relative to the floor structure. In another arrangement, the protection envelope includes a platform switch that is configured to trip upon an application of a predetermined force.