本发明涉及框架技术领域，特别是其回填以实现防火功能。 用简单的结构实现装置在火灾帧可调节口的宽度，本发明提供一种背面供电装置（18），用于备份的封闭框架（10）具有可调节开口的宽度，这封闭框架（10）包括第一Zargenteilstab（36，40）和一个 第二Zargenteilstab（88，92），所述Zargenteilstäbe（36，40; 88，92）被形成为围绕一个建筑物开口边界壁部分和攻击用于可滑动地调节口宽度彼此，其特征在于，所述背衬装置（18）的至少一个间隔元件（28 包括30），具有用于紧固件的接合的开口，通过该被固定在第一Zargenteilstab（36，40）上的壁部，以及用于维持所述第一Zargenteilstab之间（36 40）的距离，和形成在所述壁部 其中在间隔元件（28）或至少一个（28） 用于可滑动地夹持在所述第一Zargenteilstab（36，40）的凸缘（96）或所述第二Zargenteilstabes的插入区（24）（88，92）形成的多个隔离器元件（28，30）具有一个夹紧夹具（34）的形成。

The invention relates to the field of frames and in particular the backing them to reach a fire protection function. To achieve with simple constructional means an adjustable mouth width at a fire-frame, the invention provides a rear feeding device (18) for backing a closed frame (10) with adjustable opening width, which closed frame (10) comprises a first Zargenteilstab (36, 40) and a second Zargenteilstab (88, 92), said Zargenteilstäbe (36, 40; 88, 92) are formed to surround a a building opening bounding wall portion and attack for adjusting a mouth width slidably to each other, wherein the backing device (18) at least one spacer element (28 comprising 30) having an opening for the engagement of a fastener, by means of which the first Zargenteilstab (36, 40) on the wall portion to be fixed, and for maintaining a distance between the first Zargenteilstab (36, 40) and formed the wall portion is .
wherein at the spacer member (28) or at least one (28) of a plurality of spacer elements (28, 30) has a clamping clip (34) is formed, which for slidably clamping a flange (96) or insertion region (24) of the second Zargenteilstabes (88, 92 is formed) on the first Zargenteilstab (36, 40).