Abstract: A rotary power trowel having a safety clutch, a gyroscopic stabilizing ring, blade pitch control, and an adjustable handle. The safety clutch employs a belt tension adjustment to act as a brake on the drive belt when activated either manually or, in an emergency, automatically by a lever on a handle near the operator. When the rotary trowel goes out of control in an emergency, centrifugal force activates the lever and disengages the driving force and acts to brake the belt in less than one turn of the handle. The gyroscopic stabilizer ring lowers the rotary trowel center of gravity and generates a stabilizing effect. Blade tilting is accomplished through a turning knob located at the end of the adjustable handle, which is adjustable to the height of the operator.

Abstract: A body of lubricant acting also as a coolant is confined by a housing to the base of a vibratory compactor, in direct contact with the planar bottom portion of the base. Upwardly inclined end portions of the base accommodate tilting of the machine in one direction for installation of wheel assemblies or in the other direction to drain all of the lubricant from the housing. A vibration generating, eccentric rotor within the housing mounts flow directing blades to effect misting of the lubricant during vibration and direct it toward critical lubricating points.

Abstract: A portable material treating device having conventional power, supporting, and treating means is provided with a novel sealed enclosure for the gearing unit between the power source and the driven treating device. The sealed enclosure for the gearing unit may be constructed to accommodate various horsepower sizes of gas or electric power sources with two embodiments being disclosed and provides for alignment and backlash adjustment between the gears of the gearing unit by adjustment of the enclosure. A lubricant fitting may be provided whereby the bottom of the sealed enclosure acts as a lubricant sump.

Abstract: A triple seal and spacer means within a multi-part seal housing, including a sealed bearing unit which supports and protects the end of a driven shaft extending outside one peripheral end wall of a container through which the driven shaft passes. Suitable lubrication fittings are provided, and lubricant is forced through these fittings into the interior of the multipart seal housing, past two relatively soft seals having a spacer therebetween, and past another spacer and a relatively rigid long-lasting seal adjacent the wall through which the driven shaft passes.