To provide a screw jack reduced in weight without losing strength or durability.SOLUTION: A screw jack 1 comprises: a rod-like first screw shaft 6 having a male screw formed in the outer periphery; a cylindrical second screw shaft 7 having a female screw 7a formed in the inner peripheral surface so as to be engaged with a male screw 6a of the first screw shaft 6 and a male screw 7b formed in the outer peripheral surface; a ram 8 having a female screw 9a formed in the inner peripheral surface so as to be engaged with the male screw 7b of the second screw shaft 7; a screw cover 10 that covers the male screw 6a of the first screw shaft 6 and the male screw 7b of the second screw shaft 7; and a body cover 11 that convers the screw cover 10. An insert screw 9 is configured such that the ram 8 is formed by a light member lighter than steel and the female screw 9a of the ram 8 is formed by a high-strength member stronger than the light member.SELECTED DRAWING: Figure 1

    【課題】強度や耐久性を失うことなく軽量化したスクリュージャッキを提供する。【解決手段】外周に雄ネジが形成された棒状の第1スクリュー軸6と、第1スクリュー軸6の雄ネジ6aに螺合する雌ネジ7aが内周面に形成され外周面に雄ネジ7bが形成された筒状の第2スクリュー軸7と、第2スクリュー軸7の雄ネジ7bに螺合する雌ネジ9aが内周面に形成されたラム8と、第1スクリュー軸6の雄ネジ6aと第2スクリュー軸7の雄ネジ7bを覆うネジカバー10と、ネジカバー10を覆う本体カバー11と、を備えるスクリュージャッキ1において、ラム8がスチールより軽い軽量部材により形成され、ラム8の雌ネジ9aが前記軽量部材より強度が高い高強度部材により形成されたインサートネジ9である。【選択図】図1


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    Title :

    SCREW JACK


    Additional title:

    スクリュージャッキ


    Contributors:

    Publication date :

    2020-07-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    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 / B60S SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR , Warten, Reinigen, Instandsetzen, Unterstützen, Anheben oder Rangieren von Fahrzeugen, soweit nicht anderweitig vorgesehen



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