Capacity and Dimensions - Load Capacity per column: 18,000 lbs. - Load Set per set of 4: 72,000 lbs. - Lifting / Lowering Speed: 160 sec / 117 sec - Maximum Height of Column: 97.6" (2480mm) - Maximum Raised Height: 69" (1752mm) - Length of Column: 56" (1387mm) - Width of Column: 45.27" (1150mm) - Length of Lifting Fork: 13" - Width of Lifting Carriage: Adjustable 20.47"-35.43" (520mm-900mm) - Turning Circle: 53" (1346mm) - Supply Voltage: 110V/60Hz Single Phase charging batteries - Control Voltage: 24 Volts - Fuse Protection: 15A - Motor Power: 2 HP (1.49KW) - Weight per Column: No more than approximately 1500 lbs Critical Safety Specifications - The Mobile Column Lift shall utilize a drive screw (recirculating ball screw is preferred) as its primary mechanical powertrain device for raising and lowering the load-engaging lift carriage and shall not rely on pressurized fluids or related hoses and fittings. - Emergency raising or lowering of the load may be executed by use of simple hand tools and human power. - Lift shall provide an "anti-crush" switch which stops all lifts if the motion of any carriage is slowed due to descending upon an object left in its path. - Each Mobile Column Lift will include dual independent and redundant mechanically operated safety mechanisms designed to hold the lifted load should catastrophic failure of the drivetrain occur. o The first safety mechanism will include an automatically and continuously engaged, spring-actuated motor brake which safely holds the carriage in position indefinitely without risk of operator error or mechanical linkage failure present in a requirement to lower onto and engage movable "locks". o The second safety mechanism will consist of a two-piece mechanical safety wedge designed to secure the load-engaging carriage to the main column structure. o To avoid damage or injury in certain circumstances which may result from upward movement, the lift shall be able to move directly downward without first having to rise off of mechanical "locks" in the normal course of operation. - For maximum strength, carriage shall wrap around the central post. Internal carriage mounting structures not accepted. - To minimize potential for inadvertent activation by a remote controller between adjacent bays resulting in damage or injury, any remote shall operate by connected wire only. Wireless remotes shall not be accepted. - Mobile Column lifts will have been rigorously tested and third party certified in accordance with the current revision of ANSI/ALI ALCTV Standard which identifies the safety requirements for construction, testing, and validation of lifts. Critical Operating Performance Specifications - For reliability, decades-long service life and minimum energy consumption, lift movement shall be accomplished by a highly efficient, low friction recirculating ball-screw mechanism. - For eco-responsibility, cost and convenience, lift mechanism shall contain no hydraulic fluid, nor other fluid requiring recharging, exchange or disposal. - For low lifetime operating cost lift shall be battery powered, operating on commercially available batteries. - For energy conservation, downward motion of the lift carriage shall generate power which charges the batteries. - For reliable visibility and operation in a shop environment, lift shall be controlled via membrane-style buttons not via touch-screens which may be expensive and difficult to replace. - Wireless connection between the columns shall be established via a keypad sequence. To eliminate reliability concerns and to prevent likelihood of misplacement, fobs are not an acceptable method for initiation of connection between posts or to activate/operate the lift. - For strength, durability and minimum size, the central column shall be of single-piece, extruded or forged H-Beam. Bent or welded sheet metal columns are not acceptable. - For longevity, the front wheels which carry the heaviest load during lift positioning shall be chrome-plated steel, not made of materials with lesser wear characteristics like rubber or composite. - To minimize potential mechanical failure points, front wheels shall not have hydraulic or mechanical retraction linkages. - To avoid damage to overhead structures and lifted vehicles, lift shall be of static height, with no mast or other structure rising above that height as the lift operates. - To achieve a tight turning radius for operation in narrow bays the distance from the contact point of the steering wheel to the front of the lift base shall be no greater than 53 inches. Detailed Requirements - Each lifting column shall be mobile and easily positioned to the tires/wheels of the vehicle for lifting. - Each column must safely engage a wide range of standard truck tires and provide the ability, through moving forks or available reduction sleeves, to engage smaller diameter tires as well. Using any 2-columns and the front and rear light truck adapter accessories, this system must be able to raise smaller type vehicles and trailers from frame engaging points front and rear. This will leave wheels and tires free for maintenance. - This system shall have an Explosion Proof Rating of Class I, Division II. - The seller shall provide a factory-direct or a company certified service technician to set-up the equipment if desired and to maintain the equipment as required by the end user. - The Mobile Lifting System shall be tested, witnessed and Certified by a Nationally Recognized Testing Laboratory (NRTL) for operational and physical conformance to the current revision of ANSI/ALI ALCTVin accordance with the new American National Standards Institute (ANSI) requirements "Safety Standard for Automotive Lift Construction, Testing and Validation", UL-201 Standard for Safety of Garage Equipment and CAN/CSA C22.2 No.0, 14, 68 and 100 Canadian Standard. The certified posts shall be NRTL listed, both electrically and structurally, and bear the ALI/MET label of compliance. - The support column shall be a single, heavy-duty wide flange H-Beam, with a section module not less than 7 inches wide. - The H-Beam should be a solid, one piece, hot-rolled steel column. - The flanges of the beam shall be precision-machined to allow smooth operation of the lift carriage rollers. - Three quarter inch (3/4") diameter counter-bores on two-inch (2") centers shall be machined vertically into the web of the H-Beam, to provide an indent for operation of the mechanical safety lock. - The lift carriage assembly shall form a box-like structure around the support column and be guided with four (4) flanged rollers. - The bearings shall be self-lubricating type, requiring no lubrication. - The bearing shafts shall insert from the outside and provide for easy removal for inspection or replacement of rollers. - Each carriage shall have a removable access panel on the front for easy entry to all safety solenoids and switches. - The support base shall be mobile; complete with casters both rigid and swivel caster shall be provided. - A hydraulic jack shall be mounted on the steering end and shall be capable of raising the base above the floor one and three quarter inches (1.75") to provide adequate clearance when moving lifting post over uneven surfaces. - A handle shall be attached to the steering mechanism and be spring-loaded to the vertical position. Drive Mechanism and Safety Devices - The motor shall be equipped with a spring-loaded brake which engages automatically at ANY height, eliminating the need to manually engage a mechanical safety locking mechanism in order to safely work on the vehicle. - The brake shall have a means for attaching a handle, which allows manual release of the brake for lowering of lift should an electrical power failure occur without disassembly of the motor or enclosures to perform intended function. - The motor shall provide a hex socket drive which allows emergency manual lifting of the load with simple hand tools and human power. - The motor shall be sealed and self-lubricating. - A reduction gearbox shall be provided for connecting the motor to the ball screw drive assembly. - The motor/drive assembly shall generate power and recharge the batteries during carriage descent, increasing the time intervals between recharge cycles. - The Mechanical lifting drive shall be a recirculating ball bearing screw shaft and nut. - Brass or bronze type nuts or "acme" threaded nuts are not acceptable due to parasitic nature of design causing additional maintenance costs and maintenance of cleaning spindle. - Hydraulic lifting cylinders are not acceptable due to: Inherent leaking of hydraulic fluid, Additional weight of columns reduces mobility of lifts, Difficulty to synchronize the lifting posts, Additional maintenance of fluid replacement, Inconsistent operation in cooler temperatures, Manual secondary locking mechanism is required during use. - The ball screw shall be the ball bearing type and shall be completely self-contained within the nut. - There shall be no separate or external races on the nut for re-circulating the ball bearings. - Lubrication of the ball screw shaft and nut shall not be necessary more than twice a year. - A Zerk type fitting shall be provided to perform necessary lubrication. - A redundant mechanical wedge-type safety device, independent of the ball screw shaft and nut, shall be provided. - The safety device shall automatically wedge between the lifting carriage and the H-Beam creating a redundant measure of safety. - A proximity switch shall be provided which automatically stops operation of all lifting posts when mechanical safety lock engages or if an obstacle comes in contact with the lifting carriage during descent. General Electrical & Control Requirements - All wiring shall be labeled with numbers corresponding to it on electrical/schematic to assist in troubleshooting. - All switches shall be watertight. - All circuitry shall be on a printed circuit board (PCB) interfacing with all control wiring, motion detection and speed control. - Each PCB will have self-diagnostic lights, indicating operation mode. - The PCB shall be furnished with moisture protection. - The Column Controls shall enable user defined operation between three (3) different modes of operation o Automatic Mode "A" - In automatic mode, all columns operated simultaneously, the LED display shall show an "A" o Single Mode "S" - LED Display shows an "S" when selector switch is in single column position allowing the use of a single, user defined, column. o Group Mode "G" - In group mode the user defines which lifting columns of the system are used during operation, the LED display shall show a "G" - When a safety device has been activated the LED Display shall be capable of showing the user a specific Error Code to assist the user in determining cause of shutdown. - All up and down switches must be dead-man type, requiring constant pressure by an operator to raise or lower. - One no-contact proximity switch per column shall stop the operation of the column when the carriage has reached the top position and shall provide input to ensure movement and position synchronization between all columns in lifting system. - One no-contact proximity switch per column shall stop the operation of the column when the carriage has reached the fully lowered position. - A no-contact proximity "mechanical safety lock switch" shall be actuated by the ball screw nut when the mechanical safety lock engages. If an obstruction blocks the lifting carriage from lowering, the proximity switch will shut the entire system off. - LIFT CARRIAGE MOVEMENT DETECTOR: A no-contact proximity switch shall detect the up and down movement of the lift carriage and if any of the following occurs, shall stop operation of all lifting posts: o Lifting carriage does not move up or down. o Lifting carriage moves up or down faster or slower than other lifting posts by preset limit, this proximity switch shall momentarily stop the applicable column(s) and synchronize the columns during operation. o When lifting carriage is lowering, if carriage exceeds preset lowering speed, system will shutdown and safety lock will automatically engage. Power Source - Each column shall be powered by four Deep Cycle Sealed Batteries 12 VDC combined to provide stable 48 VDC. The 48 VDC on board power supply shall incorporate a built in recharging system. The battery charger should be self contained and standard 110V outlets shall be sufficient to use for charging the batteries. - The Battery Charger shall support multiple input voltages to ensure use capabilities if the lifting system is deployed outside the USA. - Battery enclosure shall provide for easy access to all batteries at ground level. - The main power shall be fused between the primary power switch and the motor/control circuits to protect against overload. Columns without input power fusing are not acceptable. - When fully charged, the on board battery power system shall be capable of 25 lifting/lowering cycles at full capacity and 45 lifting cycles at half load. Lifting systems not capable of at least 20 lifting/lowering cycles at full capacity are unacceptable. Wireless Communications - The lifts shall be free to move without any restriction from communication cables. - The Wireless Systems shall allow for up to eight columns to be selected on one communication channel. - Each lift system shall have a minimum of 10 communication channels that will allow for multiple sets of Battery Powered Wireless Mobile Column Lifts to be operated at the same time close to one-another without interference. - Wireless communication will have an automatic frequency control (AFC) to ensure that once the communication was established for a set of lifts, no other unit will interfere with the initial communication and will automatically select another channel. - The Lifts will communicate on an ISM Band that will allow for a digital narrow-band channel filtering for precise and safe operation. - For secure communication, the wireless system shall be certified to Level SIL 2 according to IEC 61508 Standards for Secure Data Transfer, in order to avoid interference with any type of radio communication equipment.
