Adjusting device for a lumbar support and method of adjusting a lumbar support

An adjusting device for a lumbar support, comprising:

• at least one guide member;
• an adjusting member coupled to said at least one guide member, said adjusting member being displaceable along said at least one guide member and configured such that said lumbar support is adjusted when said adjusting member is displaced;
• and
• a drive mechanism for effecting an adjustment of said lumbar support, said drive mechanism comprising:
• a motor;
• and
• a spindle transmission coupled to said motor, said spindle transmission comprising a spindle nut threadingly engaged with a shaft, said shaft comprising a metal core.

An adjusting device for a lumbar support, comprising:

• at least one guide member;
• an adjusting member coupled to said at least one guide member, said adjusting member being displaceable along said at least one guide member and configured such that said lumbar support is adjusted when said adjusting member is displaced;
• and
• a drive mechanism for effecting an adjustment of said lumbar support, said drive mechanism comprising:
• a motor;
• and
• a spindle transmission coupled to said motor, said spindle transmission comprising a spindle nut threadingly engaged with a shaft, said shaft being a flexible shaft.