PROBLEM TO BE SOLVED: To provide a chain block which reduces brake noise.SOLUTION: A chain block includes: a brake mechanism 50 including brake plates 53a, 53b and a female screw member 52 which can bring the brake plates 53a, 53b into pressure-contact and release the pressure-contact in accordance with a rotation direction relative to a driving shaft 40; a central transmission mechanism which is provided to be connectable to the female screw member 52 at a radial center and transmits driving force to the female screw member 52 from a handwheel 60 at a radial center side when hoisting a load upward; an outer peripheral transmission mechanism which is provided between the handwheel 60 and the female screw member 52 and transmits driving force to the female screw member 52 from the handwheel 60 at the outer peripheral side of the female screw member 52 when lowering the load downward; and an assist motor 140 for imparting assist driving force which assists the rotation of the handwheel 60 to the central transmission mechanism on the basis of the rotation.SELECTED DRAWING: Figure 1
【課題】ブレーキ鳴きを低減するチェーンブロックを提供する。【解決手段】ブレーキ板53a,53bと、駆動軸40との間の相対的な回転方向に応じてブレーキ板53a,53bへ圧接と圧接解除を行うことが可能なメネジ部材52とを備えるブレーキ機構50と、メネジ部材52と径方向の中心で連結可能に設けられると共に、荷を上昇させる巻上げ時には径方向の中心側においてハンドホイール60からメネジ部材52へ駆動力を伝達させる中心伝達機構と、ハンドホイール60とメネジ部材52との間に設けられ、荷を下降させる巻下げ時にはメネジ部材52の外周側においてハンドホイール60からメネジ部材52へ駆動力を伝達させる外周伝達機構と、ハンドホイール60の回転に基づいて、その回転をアシストするアシスト駆動力を中心伝達機構に与える補助モータ140と、を備える。【選択図】図1
CHAIN BLOCK
チェーンブロック
2018-07-05
Patent
Electronic Resource
Japanese
IPC: | B66D Haspeln , CAPSTANS |