To provide a three stage jack capable of extending/contracting quickly and in a short time.SOLUTION: A screw-type three stage jack comprises a rotation driving part 5 in a casing 1, a fixed cylinder 6 which is fixed upright on the rotation driving part 5 and becomes a first stage of a three stage jack, a rotary pipe screw 7 installed in the fixed cylinder and rotated by a rotating shaft 4, a nut block 9 for second stage formed to be liftable along the fixed cylinder 6 in the rotation restraint state due to fitting into the vertical groove on the inner surface of the fixed cylinder and screwed into the screw formed on the outer surface of the rotary pipe screw 7, a lifting cylinder 10 connected to the nut block 9 for the second stage, a nut block 11 for a third stage attached rotatably to the upper end part of the lifting cylinder, a lifting screw shaft 12 screwed into the nut block for the third stage, and a rotation transmission cylinder 13 to transmit the rotation of the rotary pipe screw 7 to the nut block 11 for the third stage. The lifting screw shaft 12 comprises a top plate 14 on its top edge and has the configuration that it is screwed into the nut block 11 for the third stage in its own rotation restraint state.SELECTED DRAWING: Figure 1
【課題】短時間で速やかに伸長、収縮させることができる三段ジャッキを提供する。【解決手段】ケーシング1内に回転駆動部5と、回転駆動部5上に立設固定されて三段ジャッキの一段目となる固定筒6と、固定筒内に配置されて回転軸4により回動する回転パイプネジ7と、固定筒内面の縦溝に嵌合して回転が拘束された状態で固定筒6に沿って昇降可能に形成され、かつ、回転パイプネジ7の外周面に形成されたネジに螺合する二段目用ナットブロック9と、二段目用ナットブロック9に連結された昇降筒10と、昇降筒の上端部に回転可能に取付けられた三段目用ナットブロック11と、三段目用ナットブロックに螺入された昇降ネジ軸12と、回転パイプネジ7の回転を三段目用ナットブロック11に伝達する回転伝達用筒13とを備え、昇降ネジ軸12は上端に天板14を備え、かつ自身の回転が拘束された状態で三段目用ナットブロック11に螺入されている構成。【選択図】図1
SCREW-TYPE THREE STAGE JACK
ネジ式三段ジャッキ
2025-03-07
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 |