PROBLEM TO BE SOLVED: To provide a screw jack capable of accurately positioning a height adjustment member at a predetermined height position.SOLUTION: A screw jack (10) comprises a base (20), a height adjustment member (30), and a lock nut member (40). The base has a female screw on a hole wall of extending in the vertical direction, and is placed on a base surface. The height adjustment member comprises: a screw shaft (31) having, on its surface, a male screw threadedly engaging with the female screw; and an abutting part (32) provided in an upper end part of the screw shaft and abutting from below on an object. The height adjustment member is supported by the base so that a height can be adjusted. The lock nut member threadedly engages with the screw shaft, and fixes the height adjustment member to the base after adjusting a height of the height adjustment member. The base has a notch part (22) crossing the hole wall of the female screw. The notch part has a ceiling wall (25) of turning downward. The lock nut member is positioned inside the notch part, and is rotation-operated in the approaching direction to the ceiling wall when fixing the height adjustment member to the base.
【課題】高さ調節部材を所定高さ位置に正確に位置決めすることのできるスクリュージャッキを提供する。【解決手段】スクリュージャッキ(10)は、基台(20)と高さ調節部材(30)とロックナット部材(40)とを備える。基台は、上下方向に延びる穴壁に雌ねじを有し、ベース面上に置かれる。高さ調節部材は、雌ねじに螺合する雄ねじを表面に持つねじ軸(31)と、ねじ軸の上端部に設けられ対象物に下から当接する当接部(32)とを有し、基台に高さ調節可能に支持される。ロックナット部材は、ねじ軸に螺合し、高さ調節部材の高さを調節した後に高さ調節部材を基台に対して固定する。基台は、雌ねじの穴壁を横切る切欠き部(22)を有する。切欠き部は、下方に向く天井壁(25)を有する。ロックナット部材は、切欠き部内に位置し、高さ調節部材を基台に対して固定する際には、天井壁に近づく方向に回転操作されるものである。【選択図】図4
SCREW JACK
スクリュージャッキ
2015-09-24
Patent
Electronic Resource
Japanese
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 |