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A device employed with a vibratory apparatus such as a mill or the like which is used to change the lead angle between rotating eccentric weights. Eccentric weights are mounted at either end of a drive motor and caused to rotate with the motor shaft at specific angles with respect to one another to

A device employed with a vibratory apparatus such as a mill or the like which is used to change the lead angle between rotating eccentric weights. Eccentric weights are mounted at either end of a drive motor and caused to rotate with the motor shaft at specific angles with respect to one another to develop a specific vibratory action. At one end, the eccentric weight is fixedly mounted on the shaft. At the other end, the weight is rotatably mounted on the shaft. A stop mechanism is associated with the shaft adjacent the rotatably mounted weight to prevent the weight from pivoting through more than a predetermined angle. By rotating the motor and shaft in a first direction, the rotatably mounted weight assumes a position on the shaft at a first stop. When the motor is reversed, the rotatably mounted weight swings to a position at a second stop. A spring is employed to bias the rotatably mounted weight against the first stop and acts to prevent damaging impact of the weight against the second stop when the motor is reversed. Provision is made for facilely varying the bias load of the spring and for quickly changing the location of the stops such that a wide variety of loads and operating conditions can be created and accomodated.

대표청구항 ▼

A lead angle controlling mechanism for a vibratory apparatus having a reversible shaft drive mechanism, comprising a first eccentric weight fixedly mounted to the shaft of the reversible shaft drive mechanism; a second eccentric weight rotatably mounted to the shaft; stop means fixed to rotate with

A lead angle controlling mechanism for a vibratory apparatus having a reversible shaft drive mechanism, comprising a first eccentric weight fixedly mounted to the shaft of the reversible shaft drive mechanism; a second eccentric weight rotatably mounted to the shaft; stop means fixed to rotate with the shaft for constraining the rotational motion of said second eccentric weight to an arc between two preselected angles relative to the position of said first eccentric weight on the shaft, said second eccentric weight thereby assuming a first position at one of said angles upon rotation of the shaft in a first direction and assuming a second position at the other of said angles upon rotation of the shaft in a second direction; and biasing means fixed to rotate with the shaft and extending to said second eccentric weight biasing said second eccentric weight toward said first position, said bias means being of sufficient strength to prevent damaging impact of said second eccentric weight against said stop means when the shaft is rotated in said second direction.