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2. 发明专利

GB386523A Hydraulic buffer with closing device for doors 未知
公开(公告)号：GB386523A
公开(公告)日：1933-01-19
申请号：GB1533332
申请日：1932-05-30
申请人： KARL MASTE
IPC分类号： E05F5/02
摘要： 386,523. Door checks and closing devices. MASTE, K., Iserlohn, Westphalia, Germany. May 30, 1932, No. 15333. [Class 65 (i).] A device which allows a door to remain at any open position without exerting any force on it but which closes the door against the action of a check when the door approaches its closed position comprises a vertical oscillating check cylinder on the door, having its pistonrod connected to one arm of a crank pivoted on the door, and a guide on the door frame arranged to engage a rubber roller on the other arm of the crank. The device is shown in its fully closed position in Fig. 1. The check cylinder f has its lower end screwed into a sleeve d pivoted on a bracket b on the door and contains a piston h pressed downward by a spring o. Ths piston-rod is pivoted at p to one arm of a crank which is pivotally mounted on the upper end of the bracket b at s and has a second arm q carrying a rubber roller r. On the top of the door frame is a guide t with which the roller r engages when the door closes. As the door opens to the position shown in Fig. 3, the piston h is raised, compressing the spring, until the piston-rod passes the axis of the pivot s, as shown, so that the parts are held in that position ; the door is then free for further opening. In closing, the door swings freely until the roller r meets the guide t, as shown, and the piston-rod is then moved over dead-centre to allow the spring to force the piston downwards and to close the door by leverage of the roller r against the guide t ; the movement is controlled by the check piston h, which has two ball valves l. The lower part of the cylinder is formed with longitudinal internal grooves w, Fig. 1, the upper ends of which are covered by the piston in the position shown. By rotating the cylinder, however, it screws out of the sleeve d and thus moves upward past the piston h, so that the tops of these grooves appear above the piston and allow fluid to pass round the piston at the end of its stroke, thus reducing the checking action and allowing the full force of the spring to act to ensure complete closing.

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