One Frame for 3 Container Lengths
The customer handles containers of different sizes every day. A fixed‑length frame would force them to buy multiple units or waste time swapping attachments. GBM engineered this over‑height frame with a telescopic design that adjusts to three common lengths: 20 feet, 40 feet, and 45 feet.
How the telescoping works?
The frame consists of a main beam with sliding extensions. To change length, the operator simply pulls the locking pins, slides the end beams to the desired position, and re‑inserts the pins. No tools, no complex mechanisms. The frame locks positively at each length, eliminating any play during lifting. Once set, the frame stays locked until the operator deliberately changes it.
Why three lengths matter?
A 20‑ft flat rack needs a different support width than a 45‑ft open‐top container. With this single GBM frame, the Indonesian terminal can handle all of them. They do not need to invest in separate equipment for each size. The telescopic feature also means the frame stores compactly when not in use—set to 20 ft, it takes up less space on the yard or in the warehouse.
Self‑Latching Locking System
The most innovative part of this over‑height frame is how it locks onto the cargo. Many over‑height frames require separate hydraulic power packs or electric actuators to operate their twistlocks. That adds weight, cost, and failure points. GBM took a different route.
Pure mechanical drive
The frame is equipped with a self‑latching mechanism that is activated directly by the main spreader. When the operator lowers the main spreader onto the frame, the spreader’s own twistlocks engage with coupling points on the frame. Then, as the spreader continues to move, a series of linkages and cams transfer motion to the frame’s lower twistlocks. Those lower twistlocks then rotate and lock onto the flat rack or irregular cargo below. The whole sequence happens without any external power source, without any buttons, and without any radio control.
Lock and unlock made simple
To unlock, the operator performs a specific lifting and lowering sequence that reverses the mechanism. The driver learns this sequence in minutes because it follows the same logic as a semi‑automatic spreader. For the Indonesian customer’s crane operators, there is no new interface to master. They simply handle the frame as an extension of their usual spreader.
Handling flat racks and irregular cargo
Once the frame is locked onto the cargo, the lift proceeds normally. The frame transfers the lifting force from the main spreader to the four corners of the flat rack or to specially placed lifting points on irregular cargo. The result is a stable, secure attachment that does not damage the goods. For project cargo such as large machinery, timber bundles, or steel coils, this frame turns a standard crane into a versatile heavy‑lift tool.
Simple, Strong, and Low‑Cost
The Indonesian customer specifically asked for a design with no hydraulics and no electronics. They had previous bad experiences with sensors failing in high humidity and hydraulic hoses leaking after a few months. GBM’s over‑height frame gives them exactly what they wanted: a completely mechanical product.
No hydraulics, no leaks
Without hydraulic cylinders, hoses, fittings, or oil, there is nothing to leak. The frame works in hot, dusty, or wet conditions without losing performance. The moving parts are all steel‑on‑steel or steel‑on‑bronze, lubricated with standard grease. Any mechanic can maintain it.
No electronics, no unexpected faults
There are no sensors, no limit switches, no control boxes, and no wiring. Electrical faults are the number one cause of downtime on modern automated equipment. This frame has zero electrical components. The only way it can “fail” is if a pin wears or a weld cracks—both easily inspected and repaired on site.
Low maintenance, low cost of ownership
Because the design is simple, the maintenance cost is a fraction of that of a hydraulic or electric frame. The Indonesian customer’s budget for spare parts is essentially limited to a few locking pins and grease nipples. Over five years, the total cost of owning this GBM frame will be dramatically lower than any powered alternative.
Customized Spreader Solution
The shipment to Indonesia is another example of GBM listening to a customer and delivering exactly what they need. We did not try to sell them a complicated, expensive powered frame. We designed a mechanical, self‑latching, telescopic over‑height frame that fits their existing main spreaders, handles 20‑45‑ft containers, and works with flat racks and irregular cargo.
We believe that the best solution is not always the most high‑tech. Sometimes it is the most reliable, the simplest, and the easiest to maintain. GBM has years of experience in container lifting equipment—spreaders, over‑height frames, telescopic chutes, grabs, and twistlocks.
Every product can be customised to your specific crane, your terminal layout, and your cargo mix.
Please contact GBM for container handling solution!
