Patent ID: 8322554

Claim:
A pit cover open/close device for covering and uncovering a pit aperture formed on an upper surface of a pit corresponding to an installation position of a roller of a chassis dynamometer which is disposed in the pit, the pit cover open/close device comprising: guides disposed on a stationary side of the pit in an opposed relation to both side faces of the roller of the chassis dynamometer and extending along a circumferential direction of the roller of the chassis dynamometer; a two-part split pit cover supported by the guides, the two-part split pit cover including two pit cover parts into which the pit cover is split from a portion thereof corresponding to a substantially central position of the pit aperture in a forward and rearward direction thereof, the two pit cover parts being movable in an opening direction and a closing direction, respectively; and a cylinder mounted to the two pit cover parts on a side opposite to the pit aperture, the cylinder including a movable rod that is connected to one of the two pit cover parts and a body that is connected to the other of the two pit cover parts, the cylinder being driven to allow the two pit cover parts to move along the guides in the opening direction and the closing direction, wherein the two pit cover parts are moved in the closing direction until the two pit cover parts reach the substantially central position of the pit aperture in the forward and rearward direction thereof upon covering the pit aperture, and the two pit cover parts are moved in the opening direction upon uncovering the pit aperture.