| 摘要 |
A leveling device for use in maintaining a relative position between two structures, one of which can be moved if the other is moved so as to maintain the same relative position between the two structures can be constructed so as to utilize a suction cup carried on the structure which can be moved in response to movement of the other structure. In such a device the suction cup is carried upon a movably mounted member so that when motion is transmitted to the member through the suction cup the member causes actuation of motion detection means. Such means are connected to the structure which can be moved so as to cause movement of this structure in response to movement of the other structure.
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