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    Position control hydraulic snubber
    15.
    发明授权
    Position control hydraulic snubber 失效
    位置控制液压缸

    公开(公告)号：US3574886A

    公开(公告)日：1971-04-13

    申请号：US3574886D

    申请日：1969-07-10

    Applicant: NORRIS INDUSTRIES

    Inventor： SOLOVIEFF GEORGE B

    IPC: E05F3/10 ,  E05F3/12

    CPC classification number: E05F3/102 ,  E05F3/12 ,  Y10T16/276 ,  Y10T16/2766 ,  Y10T16/2788 ,  Y10T16/2804

    Abstract: A hydraulic snubber for such use as a door closer in which a main piston connected to an actuator arm slides in a main chamber containing a bypass which, once passed, allows hydraulic liquid to be trapped ahead of the main piston and then actuate a control piston which is reciprocated in a control chamber. From the control chamber there are paths through which hydraulic fluid can flow to a reservoir. One path is an unrestricted passage and the other path is a restricted passage. During part of the movement cycle of the control piston, the hydraulic fluid flows freely through the unrestricted passage until a valve element carried by a separate resiliently mounted shutoff piston closes the unrestricted passage. At this point hydraulic fluid is forced through the restricted passage to the reservoir and retards movement of the control piston, which continues to move relative to the shutoff piston because of the resilient connection between them. Movement of the control piston finally stops when it bottoms against the stationary end of the control chamber. Upon the return cycle, hydraulic fluid first flows freely from the reservoir through the check valve passage to the control chamber while the shutoff valve remains closed and later, when the shutoff valve is opened, the hydraulic liquid also flows freely from the reservoir through the corresponding passage and shutoff valve seat into the control chamber.

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