A continual barrel elevator moves successive barrels on carrying arms attached to an endless chain. Hiscox’s historical sketch shows an inclined arrangement with sprockets and curved arms. The animation follows this inclined layout. In the calculator, chain speed divided by arm spacing determines the ideal delivery rate.
Continual Barrel Elevator Interactive Calculator
Compare four chain speeds at a shared carrying-arm pitch. The inclined elevator shows curved arms, a loaded rising run and an empty return. Nominal speed controls the animation; the other speeds update their own rate bars.
Equation Used
- Steady chain speed and equal carrying-arm pitch.
- One barrel per arm, with no empty positions, interruptions or losses.
- The nominal speed drives the animation; the other three cases are independent comparisons.
- An illustrative0.40 m barrel diameter and eight-arm loop are used only for the drawing. Feed and discharge trajectories are schematic.
- No chain strength, power, barrel stability, transfer clearance or operator capacity is calculated.
Compare the ideal delivery rates at four selected chain speeds. Choosing a practical operating speed also requires barrel mass, transfer geometry, chain loading and handling limits.
Following the chain around the elevator
The upper run moves uphill carrying barrels in curved arms. The lower run returns the empty arms. At each end, a sprocket turns the chain and the attached arms around a continuous path. The side elevation exposes this movement without covering it with a machine enclosure.
Hiscox figure 1404 establishes the inclined chain-and-arm arrangement. It does not specify the dimensions or detailed feed and discharge equipment. The short transfer paths in this animation are therefore identified as schematic. They join the barrel-centre path at the start and end of the rising run.
The display contains eight equally spaced arms, so its illustrative loop length is eight times the entered pitch. It fits that loop to the window while keeping a 0.40 m illustrative barrel diameter. The drawing is a kinematic explanation, not a clearance-checked installation drawing.
What continuous handling changes
The purpose of this arrangement is repeated transport: another carrying arm follows each loaded arm without waiting for a single hoist to return. The calculation describes that ideal spacing-and-speed relationship.
It does not establish which present-day facilities use this historical arrangement or how many people can safely supply it. Such operating details require information about the actual handling system.
Throughput from speed and pitch
Let v be chain speed in metres per second and p the spacing between successive carrying arms along the chain, in metres. In one minute the chain advances 60v metres, so Q=60v/p barrels per minute when each arm carries one barrel.
The interval between loaded arms is p/v seconds. Doubling speed doubles Q; doubling pitch halves Q. These relationships apply independently to each of the four entered comparison speeds.
Nominal speed is used for playback. The other speed controls change their respective result and chart bar without changing the nominal animation. Their labels do not impose an ordering or identify a recommended operating range.
Example using the initial settings
With 1.20 m pitch and 0.25 m/s nominal speed, Q=60×0.25/1.20=12.5 barrels/min. Successive loaded arms pass a point every 4.8 seconds.
The other initial speeds give 7.5 barrels/min at 0.15 m/s,15 at 0.30 m/s and20 at 0.40 m/s. These are theoretical rates, not claims about loading labour, stability or safe machine speed.
If only a proportion of arms is loaded, multiply the ideal rate by that fraction. Downtime and transfer interruptions further reduce average delivered output. Neither adjustment is inferred automatically from the current inputs.
What still needs a separate design
Throughput alone does not determine chain tension, shaft torque, motor power or structural strength. Those need the barrel masses, lifting height, machine geometry and applicable loads.
The curved arms and transfer interfaces also need a separate stability and clearance assessment. The calculator does not specify chain size, arm radius, operator limits, installation tolerances or service intervals. Use the actual loads, geometry and component ratings to assess those requirements.
Calculator questions
Why do three speeds change bars but not playback?
The animation represents the nominal-speed case. The other entries are independent rate comparisons.
Is comparison speed B a recommended operating speed?
No. The calculator contains no handling or load information that could determine a preferred operating speed.
Does changing pitch specify a real elevator height?
No. The drawing fits an illustrative eight-pitch loop to the available space. It is not a dimensional layout for an installation.
Are all arms assumed to be loaded?
Yes. The formula counts one barrel per carrying arm with no skipped loads.
Why is the elevator inclined?
That is the chain-and-curved-arm arrangement shown in Hiscox figure 1404, the construction reference for this page.
Historical construction reference
Gardner D. Hiscox, Mechanical Movements, Powers, Devices and Appliances, figure 1404, printed page 338(PDF 348). The original shows an inclined chain loop, sprockets and curved carrying arms.
The throughput relation is derived directly above from distance advanced per minute and arm spacing. The animation illustrates the inclined arrangement; it does not supply dimensions or operating limits missing from the historical sketch.
Building or designing a mechanism like this?
Explore the precision-engineered motion control hardware used by mechanical engineers, makers, and product designers.
