TELLURE ROTA
With a 4-wheel trolley, calculate the minimum carrying capacity required using
the following formula:
Solid load:
MINIMUM CARRYING CAPACITY REQUIRED = (SOLID LOAD WEIGHT + TROLLEY TARE): 3
(3 out of 4 wheels are always in contact with the ground)
Liquid load:
MINIMUM CARRYING CAPACITY REQUIRED = (LIQUID LOAD WEIGHT + TROLLEY TARE): 2
(2 out of 4 wheels are always in contact with the ground)
For each series, the catalogue shows the static, dynamic carrying capacity val-
ues and rolling resistance of each wheel.
4. MEANS OF TRACTION AND SPEED
For a static use (trolley handled only occasionally and stopped for most of the
time), it is recommended to check:
STATIC CARRYING CAPACITY OF THE WHEEL > MINIMUM CARRYING CAPACITY REQUIRED
Whereas, if the trolley is intended for frequent use or for long distances, assess
the type of handling: manual, with towed mechanical means or applied to a
driving mechanism.
Manual handling
The trolley speed is generally less than 4 km/h; it is recommended to check:
DYNAMIC CARRYING CAPACITY OF THE WHEEL > MINIMUM CARRYING CAPACITY REQUIRED
ROLLING RESISTANCE > (SOLID/LIQUID LOAD WEIGHT + TROLLEY TARE):4
The smoother the wheel, the less effort is required.
For each wheel, Tellure Rôta catalogue shows the ROLLING RESISTANCE value: it
is the maximum applicable load in correspondence of which the traction/thrust
effort remains below 5 daN.
Rolling resistance
The rolling resistance is the value (expressed
in daN) of the maximum load that can be
supported by each single wheel at a constant
speed of 4 km/h with application of a tractive
force or thrust equal to 5 daN (excluding the
initial pickup).
The 20 daN of traction/thrust force (corresponding to a
4-wheeled trolley) is the recommended limit for most of
the adult working population. The tables in the introduc-
tory notes to each series highlight the traction force re-
quired for keeping a wheel, burdened by a certain weight,
moving.
The values are detected on the TRLab laboratory test
bench that detects the rolling resistance on a 1 metre long
metal surface. They represent the average traction/thrust
force value.
The force required for starting a wheel, defined starting
point, significantly depends on the alignment position of
the brackets and is always higher than indicated on the
table.
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