Double-Sided Telescopic Cantilever Rack
A custom double-sided hand-cranked telescopic cantilever rack system designed for APOGEI METALL LLC to store 6,000 mm long profiles and pipes. Features a 4-level extendable rack layout plus 1 fixed top level, with 4 heavy-duty structural steel columns. The system supports up to 2 tons per level, extending by 650 mm with a 300 mm storage height, with the upper levels hand-cranks lowered via chain drive for ergonomics.
The Challenge: Storing 6-Meter Long Metal Profiles Safely and Accessibly
APOGEI METALL LLC needed a safe and efficient storage solution for 6,000 mm long steel pipes and profiles. Storing these heavy profiles horizontally on the floor blocked aisles and made selective forklift retrieval dangerous. The customer required a compact double-sided storage system that could store up to 2 tons per level while allowing easy overhead crane access and ergonomic manual retrieval without risking material damage.
The Solution: Double-Sided Hand-Crank Roll-Out Cantilever Rack
Extendable Gear-and-Rack Drive
Features 4 extendable levels with positive gear-and-rack drive mechanisms that prevent slippage during manual crank operation, allowing smooth drawer extension of 650 mm even under a full 2-ton load.
Lowered Chain-Drive Handles
To ensure operator safety and compliance, the crank handles for the upper 2 storage tiers (which sit at a height of 2,640 mm) are lowered to a comfortable working height via a chain-drive system.
Stable Triangular Construction
The 4 vertical columns are tied together with high-strength X-bracing links, forming a highly rigid triangular structure. Pre-drilled baseplates allow secure anchoring with concrete expansion bolts.
Operational Proof: Safe and Effortless Manual Extension
The heavy-duty roll-out cantilever rack has a total length of 6,300 mm, width of 1,710 mm, and height of 2,640 mm. Blue parts represent pre-assembled frames shipped directly to the site, minimizing field assembly to the grey components. Operator tests confirm that even at the maximum capacity of 2,000 kg per level, the mechanical gear ratio allows a single operator to crank out the arms using minimal force, ensuring 100% crane-ready profile selectivity.
Risk Mitigation & Preventive Maintenance
Anchor Bolt Integrity Check
Verify that all floor expansion anchor bolts are tightened to the specified torque. Regularly inspect the floor area around the column bases for concrete cracks or structural shifts.
Gear-and-Rack Drive Lubrication
Apply heavy-duty lithium grease to the pinion gears, rack teeth, and support rollers every 6 months to maintain storage mechanism smoothness and prevent mechanical wear under high load conditions.
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