Lighting device has main body with cylindrical wall sections at ends and central corrugated wall section with bellows-like expansion pipe connections to provide high resistance against pressure deformation

摘要

The device has a hollow main body (1) with an end cap (5) on its rear end, a lamp holder (4) at the front end for an incandescent lamp and a lamp shade (2) on the exterior of the front end. The main body is made of a cylindrical metal body subjected to a widening and/or expansion process so that the main body has cylindrical wall sections at the ends and a central corrugated wall section with a number of bellows-like expansion pipe connections (12) to provide a high resistance against pressure deformation.