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3.3 Drives
Hermann Bock GmbH equips nursing care beds with drive systems from Limoss (drive sys-
tem with external switching power supply).
The double drive for step-less adjustment of lying surfaces and the linear drive as single
drive for height adjustment of the lifting frames each consist of four main components.
– Housing
– Motor
– Gear
- Spindle with nut
The housing principle of the double drive and the single drive guarantees the permanent
function of all drive components. The special design principle is based on two force-ab-
sorbing housing shells. Due to a detailed interior structure, the construction of the housing
interior creates an essential prerequisite for the precise integration of the drive technol-
ogy. The housing of the double drive is characterised by particularly simple assembly/dis-
assembly and convenient installation space for the emergency lowering battery and con-
trol electronics above the powerful lateral slider.
3.4 The external switching power supply SMPS from Limoss
The Limoss drive has a primary fuse in the plug-in power supply and an emergency lower-
ing device. The plug-in part of the external switch mode power supply (SMPS) is an elec-
tronic transformer, which warms up only to a minimum degree under load and it is
equipped with electronic performance monitoring. The result is a constant voltage up to
the maximum load (no loss of speed) and a high level of protection against overloading.
The external transformer ensures safety right from the socket because it converts the
voltage directly into the safety low-voltage which is used to actuate the bed. It is con-
nected via plug coupling to the mains supply line feeder cable and can be replaced sepa-
rately if defective.
The plug-in part of the external switch mode power supply complies with the European
directives for electrical household appliances. In standby mode, it also has a low energy
consumption of maximum 0.5 Watt and can be used internationally with variable input
voltages from 100 V to 240 V. Electromagnetic alternating fields are not measurable on
the SMPS adapter and in operation still lower than mains isolation.
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