Machine element or mechanism – Mechanical movements – Rotary to gyratory
Patent
1976-06-24
1977-11-15
Freeh, William L.
Machine element or mechanism
Mechanical movements
Rotary to gyratory
2093665, 209367, F16H 3700, B07B 144
Patent
active
040580199
ABSTRACT:
An improved unbalance vibration generator adapted to be driven at varying rotational speeds while maintaining a substantially constant exciting force throughout a range of rotational speeds. The generator includes an unbalance mass comprising first and second unbalance masses journaled for rotation and angularly offset from each other 180.degree. about the axis of rotation. The first unbalance mass is journaled on the axis of rotation and the second unbalance mass is radially movable in relation thereto. This radial movement is restrained by cam and spring means which provide predetermined non-linear restraint of the second unbalance mass relative to the first unbalance mass. This non-linear restraint corresponds to the centrifugal force acting on the rotating second unbalance mass which varies with the square of the rotational speed, thereby reducing the total unbalance of both unbalance masses as the rotational speed increases and, alternately, increasing the total unbalance as the rotational speed decreases while maintaining the exciting force substantially constant.
REFERENCES:
patent: 952565 (1910-03-01), Fraser
patent: 2771279 (1956-11-01), Dearden
patent: 2921477 (1960-01-01), Hanggi
patent: 3342075 (1967-09-01), Lowe
patent: 3810394 (1974-05-01), Novak
Freeh William L.
Gluck Richard E.
Laney William R.
Losenhausen Maschinenbau AG
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