Rotary vibrator with adjustable weight means

Claim 1

A vibrator comprising a housing, a shaft journaled within the housing and an eccentric-type weight means carried by the shaft within the housing, said housing including wall means radial to the shaft axis and peripheral wall means joined to the radial wall means and surrounding the shaft and weight means so that both said wall means substantially enclose the shaft and weight means, said radial wall means including a first opening therethrough and providing axial access to one end of the shaft and said peripheral wall means including a second opening therethrough providing radially inward access to the weight means, said weight means including a first part connected to the shaft to rotate therewith and having a radial arm extending toward the peripheral wall means and a second part also in the form of a radial arm alongside the first radial arm, friction means cooperative among the shaft and the weight parts for connecting the second weight part for normal rotation with the first weight part and shaft, said friction means being so constructed and arranged as to enable selective forcible movement of the second weight part relative to the first weight part angularly about the shaft axis so as to achieve adjustment in the unbalance of the weight mass, said second opening providing for insertion of an element to arrest rotation of the second weight means part when the vibrator is shut down and the first opening providing for insertion of a second element to engage the shaft for manual turning of same and the first weight means part relative to the arrested second part by forcibly overcoming the friction means whereby to achieve the aforesaid adjustment of the unbalance of the weight mass.