用于抽屉式跑步机的自动伸缩装置具有通过滚动体相对于彼此移动的引导和运行导轨，具有可在两个端部位置之间在导轨上枢转的部件（54），其由弹簧装置（56 ）双向地进入枢转的端部位置并且具有用于从运行轨道向下突出的突起（50）的开口的容器（64）。 突起（50）和可枢转部件（54）相对于彼此布置，使得突出部（50）在关闭抽屉时进入容器（64），并且在该过程中，在可枢转的零件 组件由后者弹性地进入抽屉关闭位置。 在直接位于容器前方的推入方向上，设置有一个可以通过弹性变形而被凸起（50）运行的卡爪（82），并被设计成沿组件（54）运送到正确的位置 对应于抽屉位置的位置，以避免组件（54）处于错误位置时的阻塞。

An automatic engagement device (46) for guides (20) drawers opening includes a guide rail (22) and a running rail (26) movable relative to one another in the longitudinal direction on rolling bodies (rollers 42, 44 balls). A pivotable component and prestressed between two extreme positions of bistable manner in the two extreme pivotal positions by means of a spring arrangement is mounted on the guide rail (22) and comprises a receiving opening (64) of a protrusion (50) projecting downwards on the running rail (26). The protuberance (50) and the rotatable component (54) are arranged with respect to one another so that the protuberance (50) enters the receiving opening (64) when the running rail (26) moves from the open position of the drawer in the drawer closed position, by approaching the latter position, and then is elastically driven in the tray close position by the rotatable component when it has exceeded its dead point.