HYDRAULIC SYSTEM AND STRUCTURE FOR ACCESS DEVICE Russian patent published in 2016 - IPC A61G3/06 

FIELD: construction.

SUBSTANCE: present invention relates, generally, to access device operation, such as elevator for wheel chairs, approach ramp, mobile access device, etc., and, in particular, to hydraulic system, moving access device between different predetermined positions, such as lower position, unfolded position and folded position. Hydraulic system for access device, having platform is made with possibility to displace between unfolded position and folded position, wherein hydraulic system includes: at least one hydraulic power unit made with possibility to move hydraulic fluid through hydraulic circuit; at least one hydraulic cylinder, directly or indirectly connected with part of platform and made with possibility to move platform in direction of at least one of folded and unfolded positions, wherein at least one hydraulic cylinder is in communication by fluid with hydraulic power unit; and pressure regulating valve in channel between at least one hydraulic power unit and at least one hydraulic cylinder, wherein hydraulic system additionally comprises slide valve arranged in hydraulic circuit between said, at least one hydraulic power unit and at least one hydraulic cylinder, wherein slide valve provides bypass path for hydraulic fluid supply from said at least one hydraulic power unit to said at least one hydraulic cylinder, wherein slide valve is made with possibility of closing to prevent hydraulic fluid supply from said at least one hydraulic power unit to said at least one hydraulic cylinder through it, when platform is moved into folded position.

EFFECT: technical result consists in preventing access device platform folding, if user is completely or partially located on it.

20 cl, 6 dwg