Abstract: A portable backpack-borne power unit used for concrete vibration and consolidation, that is switchable between left-handed and right-handed applications. The power unit can transmit motor-generated power to a variety of tools with various power cables known in the art. For concrete vibration, power is transmitted to a vibrator that is immersed within green concrete. The instant design enables the power connection at the power unit to be secured on either side of the backpack, effectively facilitating either left-handed or right-handed operation.

Abstract: The present concrete vibrator inline transmission is a unique combination of gears that changes the speed of a primary power source so that a remote concrete tool runs at a speed different than that of the primary power source. This unique apparatus allows for unique methods of using the concrete vibrator inline transmission.

Abstract: A portable, hand-held concrete vibrating system employs a pendulous vibrator driven by a high speed, two-cycle motor that operates up to speeds of between 5000 and 6000 RPM. An elongated, rod-like frame supporting the motor is connected at its remote end to a vibrator head adapted to be immersed in plastic concrete. A pivoted weight generally coaxially disposed within the head forcibly causes vibrations in response to internal impacts. A compensating system within the head torsionally couples the flexible drive cable to the pendulous weight and accommodates axial and rotational stresses caused by high speed rotation. The compensating system, preferably disposed between sets of self aligning bearings, comprises a rigid power input end coupled to a rigid power output end by a resilient, preferably buna rubber midsection.

Abstract: A portable concrete finishing system comprising a backpack-borne, pivoting engine that powers a selected tool. A rigid frame supporting a four cycle motor is connected to the tool by a flexible power shaft. A removable vibration absorption system isolates the user from stress. A pair of integral, divergent shoulder harnesses protrude from the backpack top and an encircling, semi-elastic waist belt encircles the bottom. An integral belt tensioner permits the user to adjust belt tightness. The dampening system comprises a removable pad that has a pair of slip-on cuffs to captivate the ends of both shoulder harnesses. The frame also mounts a pair of ergonomic controls that may be easily manipulated by the user to control the power unit. A bracket assembly secures the engine to the frame. The assembly comprises a bracket pivotally coupled to a support that is attached directly to the frame. The bracket and support are hinged by a pin. The bracket directly attaches to the engine.

Abstract: A portable concrete vibrator system comprising a backpack-borne four cycle engine that powers a pendulous vibrator. The backpack comprises a rigid frame mounting a four cycle motor that is connected to the vibrator by a flex-shaft and isolated therefrom by an in-line compensator. A removable vibration absorption system isolates the user from stress. A pair of integral, divergent shoulder harnesses protrude from the backpack top and an encircling, semi-elastic waist belt protrudes from the bottom. An integral belt tensioner on each side of the belt permits the user to tighten one or both belt sides to adjust belt tightness. The backpack vibration dampening system is removable for cleaning or adjustment. The dampening system preferably comprises a thick pad that has a pair of slip-on cuffs to captivate the ends of both shoulder harnesses. A plurality of snaps or other conventional attachment points secure the remainder of the system to the frame.

Abstract: The housing of a rotary ball type industrial vibrator is injection molded from a reinforced plastic material, and an annular metal raceway structure is molded integrally with the housing and forms a contact surface for a metal ball disposed within the interior of the housing. In response to a flow of pressurized air through the housing, the ball is rapidly rotated around the metal raceway to impart oscillating vibrational forces which are transmitted through the housing to a bulk material handling structure to which it is rigidly secured. The light weight plastic housing facilitates a highly efficient vibrational force transfer to the material handling structure, and the integrally molded metal raceway structure isolates the rotating ball from the interior plastic housing surface to prevent internal housing abrasion, and significantly reduces operational noise generation.

Abstract: The housing of a rotary ball type industrial vibrator is injection molded from a reinforced plastic material, and an annular metal raceway structure is molded integrally with the housing and forms a contact surface for a metal ball disposed within the interior of the housing. In response to a flow of pressurized air through the housing, the ball is rapidly rotated around the metal raceway to impart oscillating vibrational forces which are transmitted through the housing to a bulk material handling structure to which it is rigidly secured. The light weight plastic housing facilitates a highly efficient vibrational force transfer to the material handling structure, and the integrally molded metal raceway structure isolates the rotating ball from the interior plastic housing surface to prevent internal housing abrasion, and significantly reduces operational noise generation.