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    • 2. 发明授权
    • Drum rotation indicator
    • 鼓旋转指示器
    • US4098221A
    • 1978-07-04
    • US682928
    • 1976-05-04
    • Roger D. MickelsonJohn Eric DoyleDavid L. Willard
    • Roger D. MickelsonJohn Eric DoyleDavid L. Willard
    • B66C13/46B66C13/52B66C13/56B66D1/28B66D1/40G01P13/00
    • G01P13/00B66C13/56B66D1/40
    • A drum rotation indicator enables a crane operator to sense rotation of a drum, and thereby determine linear movement of a cable, that has one end wound about the drum. This indicator has a cam, that rotates with the drum, and a cam follower, that translates rotation of the cam into linear movement. A readout plunger is located conveniently for the operator's hand, and linear motion that is induced by the cam follower is transferred to the readout plunger by a medium that can be a mechanical linkage, a push-pull cable, or a hydraulic system. In a preferred embodiment of the invention, the cam follower disengages automatically from the cam after linear motion has been transferred to the readout plunger. The linear motion transferring medium also transfers motion from the readout plunger to the cam follower, which pivots into engagement with the cam. The cam has a serrated periphery, to give an instantaneous response, upon rotation of the drum, to engagement of the cam follower with the cam.
    • 滚筒旋转指示器使得起重机操作者能够感测滚筒的旋转,并且由此确定具有卷绕在滚筒上的一端的缆线的线性移动。 该指示器具有与滚筒一起旋转的凸轮,以及将凸轮的旋转转换为直线运动的凸轮从动件。 读出柱塞方便地用于操作者的手,并且由凸轮从动件引起的线性运动通过可以是机械联动装置,推拉电缆或液压系统的介质传送到读出柱塞。 在本发明的一个优选实施例中,在直线运动传递到读出柱塞之后,凸轮从动件与凸轮自动脱离。 线性运动传递介质还将读出柱塞的运动传递到凸轮从动件,凸轮从动件枢转成与凸轮接合。 凸轮具有锯齿形周边,以便在滚筒旋转时给予瞬时响应以使凸轮从动件与凸轮接合。