The larger the lid, the more unpleasant the consequences if it should start moving on its own and fall shut. In addition to force support, the LIFT-O-MAT gas spring with end position stop also provides a safe mechanical lock of the application in the open position. The lock of a gas spring with the lock on the inside is comparable with the mechanics of a ball point pen. A light push on the piston rod in the extended position locks it; a quick movement in the extension direction releases the lock. A lock is always necessary or recommended, if the application needs to be protected against accidental adjustment or if the application is subject to forces that exceed the extension force of the spring. Such forces could be wind or snow loads affecting the application. Typical areas of application are Sales kiosks (beer kiosk).