| 摘要 |
The mechanical elevating and revolving gates consist of a support box, an overlapping monolithic plate, lever mechanisms, and hinges. The overlapping plate is raised vertically upwards by a predetermined amount (up to 1 meter), after which the said plate is turned by 90 degrees, completely opening an aperture in the support box and forming a protective cover above the gates. These two movements are carried out by a single mechanism which transforms from a crank mechanism into a four-link chain mechanism and vice versa. Such transformation is possible due to two original hinges attaching the upper part of the overlapping plate to the support box. Such gates do not require locks and bolts. Even heavy snow accumulations will not prevent the gates from opening and closing. |
| 主权项 |
1. Mechanical elevating and revolving gates comprising a support box, an overlapping monolithic plate, lever mechanisms, connecting hinges, and a drive, wherein, in order to improve the performance, two lateral sides of the plate are connected, in the lower part of the plate, by hinges with two rods of the drive, and two slide blocks having the shape of a circle with parallel cut-off segments are rigidly fixed on the upper parts of these sides, and two guide members with grooves in each of them accommodating slide blocks of the monolithic plate are secured on the side walls in the upper part of the box; wherein the upper portion of each groove of the guide member is ended by a cylindrical surface with the internal diameter being equal to the diameter of the slide block circle, and the width of the grooves being equal to the remaining part of the slide block circle, while the lower part of the box side walls is provided with two dead stops. |
