LUBRICANT SUPPLY DEVICE

To detect the lower limit of lubricant (in particular, grease) twice, at a normal level where there is still room for replacement of a cartridge tank, and at an emergency level where urgent replacement is required.SOLUTION: A lubricant supply device comprises: a relay holder 20 having a relay hole 210 communicating with a lubricant suction port 111 and arranged on the pump base 11; a floating holder 30 having a tank discharge port fitting part 310 on the upper end side and having, on the lower end side, a sleeve 313 inserted into the relay hole 210 so as to be vertically movable; a compression spring 40 that is arranged between the relay holder 20 and the floating holder 30, is pushed down by the load when a tank load (weight) is equal to or more than a threshold value for lower limit detection, and pushes up the floating holder 30 when the tank load (weight) is less than the threshold value; and a switch 50 whose drive unit is the sleeve 313. A normal level alert is given when the switch 50 turns from on to off, and then an emergency level alert is given when the switch turns from off to on.SELECTED DRAWING: Figure 1 【課題】潤滑剤（特にはグリース）の下限検知をカートリッジタンクの交換までまだ余裕のある通常レベルと、緊急に交換を要する緊急レベルの２回にわたって行う。【解決手段】潤滑剤吸入ポート１１１に連通する中継孔２１０を有しポンプ基台１１上に配置される中継ホルダー２０と、上端側にタンク吐出口嵌合部３１０を有し下端側に上記中継孔２１０内に上下動可能に差し込まれるスリーブ３１３を有する遊動ホルダー３０と、中継ホルダー２０と遊動ホルダー３０との間に配置され、タンク荷重（重量）が下限検知用の閾値以上のときにはその荷重によって押し下げられ閾値未満のときには遊動ホルダー３０を押し上げる圧縮バネ４０と、スリーブ３１３を駆動部とするスイッチ５０とを備え、スイッチ５０がオンからオフに転じた時点で通常レベルの警報を行い、その後にオフからオンに転じた時点で緊急レベルの警告を行う。【選択図】図１