To provide a jack cylinder comprising a rod cover unfastening preventive structure capable of effectively preventing oil leakage caused by unfastening of a screw part.SOLUTION: A jack cylinder consists of a hydraulic cylinder comprising: a cylinder tube 20; a piston rod 21 inserted into the cylinder tube in a freely slidable manner; a rod cover 22 which is screwed with a rod side opening 20a of the cylinder tube and holds the piston rod in a slidable and liquid-tight manner; and a cap 23 which is screwed with the rod side opening and regulates moving of the rod cover in an unfastening direction. The rod cover and the cap comprise engage parts 35 which respectively include flange parts 29 and 34 for giving screw fastening force and of which the flange parts are engaged with each other while being respectively screwed by screws of which screw directions are different forward and backward.SELECTED DRAWING: Figure 4

    【課題】ねじ部の緩みに起因した油漏れを効果的に防止することが可能なロッドカバーの緩み止め構造を備えたジャッキシリンダを提供する。【解決手段】ジャッキシリンダは、シリンダチューブ20と、該シリンダチューブ内に摺動自在に挿入されたピストンロッド21と、シリンダチューブのロッド側開口部20aに螺着されてピストンロッドを摺動可能かつ液密に保持するロッドカバー22と、ロッド側開口部に螺着されてロッドカバーの緩み方向への移動を規制するキャップ23とを備えた油圧シリンダからなり、ロッドカバー及びキャップは、ねじ締結力を与える鍔部29,34をそれぞれ有し、ねじの向きが正逆異なるねじでそれぞれ螺着された状態で、互いの鍔部同士が係合する係合部35を有している。【選択図】図4


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    Title :

    JACK CYLINDER


    Additional title:

    ジャッキシリンダ


    Contributors:

    Publication date :

    2022-04-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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