A Link Chain Hoist is a lifting device that uses a calibrated load chain wrapped around a pocketed lift wheel — driven by a hand chain or electric motor through a gear reduction — to raise and lower heavy loads. It solves the problem of moving multi-tonne loads vertically with a small input effort and tight overhead clearance. The pocket wheel meshes positively with each chain link, so the chain cannot slip under load, and an internal Weston-style load brake holds position when input torque stops. Typical units lift 250 kg to 50 tonnes with mechanical advantages from 30:1 up to over 100:1.
Link Chain Hoist Interactive Calculator
Vary lifted load and overall mechanical advantage to see required hand-chain pull and the pocket-wheel load path.
Equation Used
The calculator uses the worked example relationship for a link chain hoist: required hand-chain pull equals the lifted load divided by the overall mechanical advantage. The overall MA combines the internal gear reduction and the number of load-chain falls.
- Worked example uses ideal overall mechanical advantage with no efficiency loss.
- Hand pull is shown as kgf mass-equivalent and newtons.
- Overall mechanical advantage includes gearing and load-chain falls.
The Link Chain Hoist in Action
The core trick of a Link Chain Hoist is that the chain doesn't sit on a smooth drum like a wire rope hoist — it engages a pocket wheel (sometimes called a lift wheel or chain sprocket) that has machined recesses sized to capture every other link. Pull the hand chain and you turn an input shaft; that shaft drives a 2 or 3 stage spur gear reduction, which turns the pocket wheel, which feeds load chain over the top and lifts the bottom hook. Mechanical advantage stacks two ways — the gear ratio inside the gearbox, and the number of falls of load chain between the top block and the bottom hook. A 1.5 tonne hand chain hoist typically runs around 60:1 overall, meaning you pull about 25 kg on the hand chain to lift 1500 kg.
The chain itself is the part that gets specced wrong most often. Load chain is calibrated Grade 80 or Grade 100 alloy steel, heat-treated, and the pitch must match the pocket wheel within roughly ±0.2 mm. Use a hardware-store proof coil chain in a hoist designed for Grade 80 and the links will either jump pockets — chain surge, then a free-fall drop — or wedge and snap. The hand chain is a different animal, usually a finer pitch, and runs over a separate hand wheel with shallower pockets.
The load brake is what keeps the load from running away when you let go. Most manual hoists use a Weston-type screw brake — two friction discs sandwich a ratchet pawl, and the load itself clamps the discs together through a coarse-thread screw on the input pinion. Lift, and the screw tightens. Stop, and friction plus the pawl hold. Lower, and you're back-driving against that friction, which is why lowering a heavy load feels notchy. If you notice the load creeping after you stop pulling, the friction discs are oily or glazed — that brake needs to be opened and inspected before you trust it with another lift.
Key Components
- Load chain: Calibrated Grade 80 or Grade 100 alloy chain that carries the load. Pitch tolerance is tight — typically ±0.2 mm on a 6 mm chain — because the pocket wheel relies on exact link spacing to engage cleanly. Replace the chain if any link stretches more than 3% over its original pitch.
- Pocket wheel (lift wheel): Machined steel wheel with recesses shaped to capture every alternate link. Drives the load chain positively, no slip. A 5-pocket wheel is standard on hand hoists; larger electric units use 4-pocket wheels with deeper engagement for higher load duty.
- Gear reduction: 2 or 3 stage spur gear train between the input shaft and pocket wheel. Ratio typically 30:1 to 100:1 depending on capacity. A 1 tonne hoist runs about 35:1 — pull 30 kg on the hand chain, lift 1000 kg, accepting about 80% mechanical efficiency through the gear train.
- Hand chain and hand wheel: Smaller chain that drives the input pinion through its own pocketed wheel. On a 3 tonne hoist you pull roughly 1 m of hand chain per 50 mm of load lift — that's the visible expression of the gear ratio.
- Weston load brake: Friction-disc and ratchet brake that holds the load when input torque is removed. Two friction washers sandwich a ratchet, and the load itself provides the clamping force through a screw thread on the input shaft. Self-actuating — no spring, no electrical signal.
- Top and bottom hooks with safety latches: Forged alloy steel hooks rated to the same WLL as the chain. Both hooks rotate freely (top hook 360°, bottom hook usually 360° as well) so the chain doesn't twist under load. Safety latches are non-negotiable on any rigging job.
- Chain stripper and guide: Small steel fitting next to the pocket wheel that forces each chain link off the wheel after it disengages. If the stripper bends or wears, links pile up on the wheel and the hoist jams mid-lift.
Industries That Rely on the Link Chain Hoist
Link Chain Hoists earn their place wherever you need vertical lift in tight overhead space, with no power supply or with a simple 3-phase feed, and where the load needs to hold position safely when nobody is touching the controls. They show up in workshops, on cranes, in theatres, and on offshore platforms.
- Manufacturing: Harrington CF series 1 tonne hand chain hoists hung from overhead jib cranes for engine pulls in heavy-truck repair shops
- Entertainment rigging: CM Lodestar D8+ electric chain hoists flying line-array speakers and lighting trusses at venues like the Royal Albert Hall
- Construction: Yale 360 lever-operated link chain hoists tensioning structural cable bracing during steel erection on commercial mid-rise builds
- Wind energy: Stahl ST series electric chain hoists installed inside the nacelle of Vestas V90 turbines for lifting gearbox sub-assemblies and generator components during service
- Marine and offshore: Kito M3 corrosion-resistant manual chain hoists for engine room maintenance aboard tugs and platform supply vessels
- Theatre and film: ChainMaster BGV-D8 Plus motors flying scenery battens at venues like the Sydney Opera House
The Formula Behind the Link Chain Hoist
The number every operator wants is the hand-chain pull required to lift a given load — that tells you whether one rigger can run the hoist or whether the load is over-spec for manual operation. At the low end of the typical operating range (a 250 kg picker hoist, around 30:1) you pull roughly 12 kg on the hand chain — light, two-finger work. At the nominal mid-range (1.5 tonne, ~60:1) you pull about 25-30 kg, which is solid two-handed effort. At the high end (5 tonne manual hoist, ~100:1+) you're pulling 35-40 kg per stroke — sustainable for short lifts, exhausting for full hook travel. The sweet spot for one-person operation sits between 1 and 3 tonnes.
Variables
| Symbol | Meaning | Unit (SI) | Unit (Imperial) |
|---|---|---|---|
| Fhand | Force required on the hand chain | N | lbf |
| W | Load on the bottom hook | N | lbf |
| dload | Pitch diameter of the load pocket wheel | m | in |
| dhand | Pitch diameter of the hand wheel | m | in |
| i | Internal gear reduction ratio | — | — |
| nfalls | Number of falls of load chain | — | — |
| η | Mechanical efficiency of the gear train and brake | — | — |
Worked Example: Link Chain Hoist in a craft-brewery fermenter manway hoist
You are sizing a manual link chain hoist for a 30 hL stainless steel fermenter at a regional craft brewery. The brewery wants a 1 tonne hand chain hoist mounted on a swing-arm jib above the fermenter to lift the 220 kg manway dome and 180 kg agitator assembly during deep-clean cycles. You need to confirm a single technician can operate the hoist and that the chosen unit gives sensible lift speed.
Given
- W = 2200 N (220 kg manway)
- dload = 0.075 m
- dhand = 0.135 m
- i = 35 — (single-stage 1 tonne unit)
- nfalls = 1 —
- η = 0.80 —
Solution
Step 1 — compute the nominal hand-chain pull for the 220 kg manway dome:
That's about 4.5 kg of pull — light, comfortable single-hand operation. The technician can run this all day.
Step 2 — at the low end of the realistic load range, lifting just the 80 kg manway gasket-cleaning fixture (W = 800 N):
At this load the hoist feels almost unloaded — you'll spend more effort pulling slack out of the hand chain than lifting. Chain feed time dominates the cycle.
Step 3 — at the high end, the worst case is lifting the 180 kg agitator assembly together with a 40 kg lifting beam (W = 2200 N already covered nominal, so push to the rated 1000 kg WLL = 9810 N):
At rated capacity you're pulling roughly 20 kg per stroke — still within OSHA-style two-handed manual effort guidance (max ~35 kg sustained), but you'll want a break every 2 m of lift. Hand-chain travel-to-load-lift ratio is i × (dhand/dload) = 35 × 1.8 = 63, so 1 m of hook travel needs 63 m of hand chain. Plan the chain bag accordingly.
Result
Nominal hand-chain pull is 43. 7 N (about 4.5 kg) to lift the 220 kg manway — well within single-technician comfort. Across the operating range, the hoist feels almost slack-limited at 80 kg, comfortable at 220 kg, and demands real two-handed effort at the 1000 kg rated WLL — so the 1 tonne unit is correctly sized with headroom but isn't overkill. If a technician reports the pull feels heavier than predicted, three culprits dominate: (1) glazed Weston brake friction discs adding back-drive drag — symptom is the same heavy feel both lifting and lowering; (2) a worn or contaminated pocket wheel where chain links sit proud of the pockets, raising effective pitch diameter and dropping efficiency below 0.7; or (3) an off-axis bottom hook pulling the load chain across the chain stripper, which scuffs and binds — you'll hear a regular click-click each revolution.
When to Use a Link Chain Hoist and When Not To
A Link Chain Hoist is not always the right answer. Wire rope hoists win on lift speed and headroom-per-capacity; lever hoists win where you need to pull horizontally or position precisely; and electric chain hoists win on duty cycle. Compare on the dimensions you actually care about for the job.
| Property | Link Chain Hoist (manual) | Wire Rope Hoist (electric) | Lever Chain Hoist (come-along) |
|---|---|---|---|
| Typical load capacity | 250 kg – 50 t | 500 kg – 80 t+ | 250 kg – 9 t |
| Lift speed | 0.5 – 2 m/min (manual) / 4 – 8 m/min (electric) | 8 – 16 m/min | 0.3 – 1 m/min |
| Headroom required | Medium — 400-600 mm at 1 t | Large — 700-900 mm at 1 t | Small — 350-450 mm at 1 t |
| Positioning precision | ±5 mm (one chain link pitch) | ±20 mm (rope creep) | ±2 mm (single ratchet click) |
| Duty cycle | Manual: occasional / Electric: 25-40% ED | 60% ED on industrial units | Occasional only |
| Capital cost (1 t unit) | $200 – $600 manual / $1500 – $3000 electric | $3000 – $8000 | $150 – $400 |
| Maintenance interval | Annual brake & chain inspection | Quarterly rope inspection, gearbox oil | Annual pawl & frame inspection |
| Best application fit | Vertical lift, intermittent industrial | High-cycle production lifting | Horizontal pulls, tensioning, tight spaces |
Frequently Asked Questions About Link Chain Hoist
That's the Weston brake working as designed, not a fault. Lowering back-drives through the friction discs, so the load itself is partially holding the brake closed while you fight it open one ratchet click at a time. You feel a small step at every pawl tooth — typically 6 to 10 clicks per revolution of the hand wheel.
It only becomes a real problem when the friction discs are contaminated with oil or worn smooth. Then lowering goes from notchy-but-controlled to either glassy-and-runaway or completely seized. If you notice the steps disappearing into a smooth slide, stop using the hoist — the brake is no longer self-arresting and the load can free-fall.
The trade is lift speed against hand effort and headroom. A 1-fall 2 tonne hoist gives you double the lift-per-pull but needs roughly twice the hand-chain force compared to a 2-fall version of the same capacity. For a 2 tonne load that means about 40-45 kg of pull single-fall versus 20-25 kg double-fall.
Rule of thumb: if the operator pulls more than 35 kg sustained, go to 2 falls or step up to electric. Also check headroom — 2-fall configurations add a moving bottom block, eating 200-300 mm of vertical space. On a low-clearance job that often forces the 1-fall choice and the heavier pull.
Almost always the load chain is jamming at the chain stripper or piling up in the chain bag. The stripper is a small steel fitting that peels each link off the pocket wheel after it disengages. If it's bent, worn, or installed with the wrong clearance (typical spec 1-2 mm from the pocket wheel face), links fail to disengage cleanly and stack up.
Diagnostic check: lower the load fully, then inspect where the chain enters the chain bag. If you see twisted links or links sitting on top of each other instead of feeding cleanly, the stripper is the cause 8 times out of 10. The other 2 are a kinked load chain or the chain installed inside-out — every link in a calibrated load chain has a specific orientation, and reversing one segment will cause periodic jamming on every revolution.
Three causes dominate, in order of frequency. First, side-loading — if the top hook isn't directly above the bottom hook, the chain runs at an angle through the pocket wheel and binds, spiking torque even at half-rated load. The CM Lodestar overload clutch is set to slip around 125% of WLL but reads peak torque, not steady-state load.
Second, the clutch friction surfaces are glazed from previous slip events and grabbing inconsistently. Third, snatch loading — if you hit the up button while there's slack chain, the load accelerates from zero and the inertial spike easily doubles the static load. Take up slack with a slow inch-up before committing to the full lift.
No, and this is the single most common mistake on owner-installed hoists. Load chain is welded calibrated alloy — every link is butt-welded closed during manufacture, then heat treated and proof-loaded. There is no field-installable connecting link rated for the chain's full WLL. Aftermarket connectors exist but are rated for binding chain, not lifting.
If your chain is too long, either order the hoist with a custom chain length from the manufacturer (Kito, CM, Harrington all offer this) or fit a longer chain bag and let the excess coil safely. Cutting and rejoining a load chain with a bolted connector has caused fatal accidents and will fail any rigging inspection.
It matters more than people expect. A clean, well-lubricated single-stage 35:1 hoist runs around 80-85% efficient. Add a second stage to reach 70:1 and you typically drop to 70-75%. Three-stage 100:1+ units sit around 65%. So when you double the gear ratio, you don't get a doubled mechanical advantage — you get roughly 1.7× to 1.8× because the extra meshes eat the gain.
For sizing, use η = 0.75 as a default for any 2-stage hand hoist and η = 0.65 for 3-stage. If you used 0.85 in a calculation and the real pull comes out 15% heavier than predicted, that's almost certainly the efficiency assumption — not a fault in the hoist.
References & Further Reading
- Wikipedia contributors. Hoist (device). Wikipedia
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