| 摘要 |
There is disclosed a motion sensor which may be utilized for sensing rotary motion and incorporating a housing formed with a vertical barrel having pins projecting diametrically inwardly from the opposite sides thereof and terminating in spaced apart relationship. Received telescopically in the barrel between the pins is a cylindrical float formed on its opposite sides with outwardly opening reliefs forming at their upper extremities downwardly concave arches for resting on the pins and each forming a pair of horizontally spaced apart flutes extending downwardly on opposite sides of a vertical rib which terminates at its upper extremity in an upwardly facing abutment surface aligned centrally below such arch for selective engagement with the pins as the float is telescoped upwardly in such barrel. Consequently, the float will normally be suspended from the barrel by engagement of the arches with the pins to thus align such rib directly below the pins and upon raising of the float vertically upwardly the abutment surfaces will engage such pins to limit further upward movement. However, when the float is rotated in one direction or the other during its vertical upward travel the ribs will be rotated to one side of the pins thus allowing such pins to pass downwardly in the flutes to permit further upward travel of the float.
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