Drive system
AssigneeDrive Systems Limited
InventorsNigel S. Campbell, David Lavender
Life of this patent
Estimating the term…
Abstract
A rotary arm sewage treatment bed has its rotary arms driven by an electrical drive system. The drive system comprises a driving ring (7) to which the arms are secured. The drive ring is driven by a friction belt (8), from a drive wheel (10). The drive wheel (10) is mounted on a pivoted carriage (18). A compressor (30) operates a piston/cylinder (36)/(34). In normal use, the piston (36) acts on the carriage (18) to cause tensioning of the belt (8), and thus enable drive. In the event of a supply failure, the piston is retracted by a return spring and the drive is disengaged, the carriage being pivoted such that the drive wheel is no longer in a position to tension the belt (8). The arms are then free to rotate under the reaction force of the sewage emitted, until the power supply is restored.
Claims16
A drive system comprising:
- a rotary part to be rotated, the rotary part comprising a drive ring;
- a drive belt in contact with the drive ring;
- a drive wheel in driving engagement, in normal operation, with the drive belt, to thereby drive the drive ring;
- an electric motor for driving the drive wheel;
- and a control means connected to the drive wheel, for automatically removing the drive wheel from driving engagement with the drive belt in any one or more of the following circumstances:
- if the supply voltage fails;
- if the supply voltage falls below a minimum voltage;
- if for a reason other than the voltage failing or falling below said minimum voltage, the motor does not operate.
A rotary arm system for a sewage treatment bed, including a drive system which comprises:
- a rotary part to be rotated, the rotary part comprising a drive ring;
- a drive belt in contact with the drive ring;
- a drive wheel in driving engagement, in normal operation, with the drive belt, to thereby drive the drive ring;
- and electric motor for driving the drive wheel;
- and a control means connected to the drive wheel, for automatically removing the drive wheel from driving engagement with the drive belt in any one or more of the following circumstances:
- if the supply voltage fails;
- if the supply voltage falls below a minimum voltage;
- if for a reason other than the voltage failing or falling below said minimum voltage, the motor does not operate.
Dependencies are inferred from the claim text.