Technical Foundation
What Is a Jib Crane?
A jib crane is a rotating boom crane, fixed at one point (a wall bracket, a freestanding floor-mounted column, or an existing building column) with the boom carrying a trolley and hoist that travels along its length, giving coverage over a circular or partial-circular work area without needing overhead bridge crane rail. Wall-mounted (or wall-bracket) jibs rotate up to about 180 degrees and are the lowest-cost option where a suitable wall or column is available; floor-mounted (freestanding) jibs rotate a full 360 degrees and don't depend on an existing structure to carry the load, but require a properly engineered foundation to react the overturning moment.
Capacity rating is specified at the full boom reach (span), since the load's leverage on the mast and foundation increases with distance from the mounting point — a jib rated for 2,000 lbs at a 12-foot span will not safely lift 2,000 lbs at a longer, unrated extension. Foundation design for floor-mounted jibs is critical and typically engineered specifically for the site (soil bearing capacity, frost depth, and the specific overturning moment of the rated capacity and span combination), which is why floor-mounted jib crane foundations are not a generic, one-size-fits-all specification.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Mount Type | Wall-bracket, floor-mounted (freestanding), or existing-column mount | Wall/column mounts depend on adequate existing structure; floor-mounted needs an engineered foundation |
| Rotation Range | Up to 180° (wall/bracket) or full 360° (freestanding) | Wall mounts are limited by the wall itself; freestanding jibs give full circular coverage |
| Capacity | Rated at full boom span/reach, e.g. 1,000–5,000+ lb | Load leverage increases with reach — capacity is only valid at the rated span, not beyond it |
| Boom Span | Distance from mast centerline to hoist trolley limit | Sized to actual workstation coverage needed — undersized span limits usable work area |
| Foundation Requirement | Engineered per site soil condition and overturning moment | Floor-mounted jib foundations are site-specific engineering, not a generic bolt pattern |
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Applications
Where Jib Cranes Get Used
Jib cranes are specified anywhere a work cell needs repetitive, localized lifting coverage without the cost and structural requirement of a full overhead bridge crane system.
Machine Tool Load/Unload Stations
Jib cranes positioned at individual CNC machines and workstations for repetitive workpiece loading and unloading.
Welding & Fabrication Work Cells
Wall-mount jib cranes providing repetitive lifting coverage over a single welding or fabrication station.
Assembly Line Workstations
Fixed-point lifting assistance integrated into individual assembly stations along a production line.
Maintenance & Repair Bays
Freestanding jib cranes providing lifting capability for component removal and installation in maintenance areas.
Warehouse & Loading Dock Spot Lifts
Localized lifting coverage at specific dock or staging points not served by an overhead bridge crane.
FAQ
Jib Cranes Questions, Answered
How do I decide between a wall-mount and a freestanding floor-mount jib crane?
A wall-mount jib is lower cost and simpler to install if there's an adequately rated wall or existing building column at the right location, but its rotation is limited to roughly 180 degrees or less and it depends entirely on the structural adequacy of that existing wall or column. A freestanding floor-mounted jib gives full 360-degree rotation and doesn't depend on existing structure, but requires its own engineered foundation and generally costs more to install — the choice usually comes down to whether suitable existing structure is available and whether full rotation is actually needed.
Why is jib crane capacity rated specifically at the boom span, not as a flat number?
The load's effect on the crane's mast, boom, and foundation (or wall mounting) increases with how far out along the boom the load is positioned, because of the increased leverage (moment) at greater reach. A jib rated for a specific capacity at its full rated span cannot safely handle that same capacity at a longer, unrated extension, which is why capacity and span are always specified together, not capacity alone.
What goes into engineering a foundation for a freestanding jib crane?
The foundation has to react the crane's overturning moment — the combined effect of the rated load, boom span, and the mast's own weight trying to tip the structure — which depends on local soil bearing capacity, frost depth in colder climates, and the specific crane's capacity and span combination. This is why floor-mounted jib crane foundations are typically engineered per-site by a structural engineer familiar with the specific crane model's loading data, rather than built to a generic universal foundation drawing.
Can an existing building column be used to mount a jib crane instead of a dedicated mast?
Yes, if the column is structurally verified (typically by a structural engineer) to handle the jib's rated load and the resulting bending moment applied at the mounting height — this is a common and cost-effective approach where suitable columns already exist in a facility. It should never be assumed without engineering verification, since most building columns aren't originally designed to carry the concentrated lateral loading a jib crane introduces.
What's an articulating jib crane, and when is one used instead of a standard rigid boom?
An articulating jib crane has a boom with an additional pivot point partway along its length (sometimes called a jib-and-boom or knuckle-boom design), letting the crane fold back on itself for a more compact stowed footprint or reach around obstructions that a straight rigid boom couldn't clear. They're typically specified in tighter workspaces or where the load path needs to route around fixed equipment, at a higher cost and complexity than a standard single-boom jib.
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