Improvements in or relating to compressed air supply apparatus.

摘要

A motor driven compressor 16 is supplied with power from a battery 3 and supplies compressed air at outlet 21 of air base 22. Compressed air via hose 22 is supplied to a lifting device, for example a bellows of an invalid seat assembly. In the apparatus 1 min the output of the compressor C is passed through a non-return valve 4 so that when the compressor is turned off supplied air cannot bleed back through the compressor. Pressure switch 6 breaks the electrical circuit should pressure build up excessively at the output 21. Additionally, air dump valve 5 is provided to enable pressure in the output line 22 to be vented to atmosphere. Operation of the compressor C is controlled by hand control 7 min .