초록 ▼

A vibratory power unit (10, 210) having small gasoline engine (12) coupled by a drive shaft (15) extending through a semi-rigid shaft case (16, 18, 20) to an eccentric (75) rotating with the aid of sealed bearings (74, 78) within a vibrator case (14, 514) is disclosed. The semi-rigid shaft case incl

A vibratory power unit (10, 210) having small gasoline engine (12) coupled by a drive shaft (15) extending through a semi-rigid shaft case (16, 18, 20) to an eccentric (75) rotating with the aid of sealed bearings (74, 78) within a vibrator case (14, 514) is disclosed. The semi-rigid shaft case includes a first rigid shaft case portion (16) and a second rigid shaft case portion (20) coupled together by an isolator (18, 518, 618). A coupling (90, 790) is provided for removably coupling the vibratory power unit (10, 210) to concrete finishing tools (11, 211). The coupling includes a split ball (92) configured to be received on the vibrator case (14, 514) and a slit ring (110) configured to compress the split ball (92) onto the vibrator case (14, 514). A radio controlled throttle controller (300, 400, 500) is provided for remotely controlling the speed of engine (12). Radio controlled throttle controller (300, 400) scavenges electrical power from the magneto circuitry of the engine (12).

대표청구항 ▼

What is claimed is: 1. A concrete finishing tool comprising: an internal combustion engine having a rotating shaft and a housing; a vibrator including a vibrator case and an eccentric housed for rotation therein, said eccentric being coupled to the rotating shaft of the internal combustion engine b

What is claimed is: 1. A concrete finishing tool comprising: an internal combustion engine having a rotating shaft and a housing; a vibrator including a vibrator case and an eccentric housed for rotation therein, said eccentric being coupled to the rotating shaft of the internal combustion engine by a drive shaft; a semi-rigid mechanical coupling extending between the housing of the internal combustion engine and the vibrator case, said coupling including a semi-rigid shaft case and an isolation unit through which the drive shaft passes, the isolation unit being disposed between the internal combustion engine and the vibrator to reduce vibrations experienced by the internal combustion engine and the isolation unit includes a first rigid portion, a second-rigid portion and an anti-vibration portion therebetween; a coupling configured to releasably couple the vibrator to a concrete finishing tool, the coupling being configured to transfer vibration from the vibrator to the finishing tool. 2. The device of claim 1 and further comprising a handle coupled to the semi-rigid shaft case whereby the user can control rotation of a concrete finishing tool coupled to the vibrator. 3. The device of claim 1 wherein the coupling is configured to permit adjustment of the vertical angle between the finishing face of the concrete finishing tool and the longitudinal axis of the semi-rigid shaft case. 4. The device of claim 1 wherein the coupling is configured to permit adjustment of the horizontal angle between the concrete finishing tool and the longitudinal axis of the semi-rigid shaft case. 5. The device of claim 1 wherein the first and second rigid portions are respectfully a first rigid shaft case portion and a second rigid shaft case portion and the isolation portion couples the first rigid shaft case portion of the semi-rigid shaft case to the second rigid shaft case portion. 6. The device of claim 1 wherein the first and second rigid portions the isolation unit include proximal, central and distal plates and the anti-vibration portion includes proximal and distal anti-vibration portions, the proximal anti-vibration portion being disposed between the proximal and central plate and the distal anti-vibration portion being disposed between the distal and central plates. 7. The device of claim 6 wherein the semi-rigid shaft case includes a first rigid shaft case portion and a second rigid shaft case portion and the isolation unit couples the first rigid shaft case portion to the second rigid shaft case portion. 8. The device of claim 7 wherein the first rigid shaft case portion is rigidly coupled to the central plate and the second rigid shaft case portion is rigidly coupled to the distal plate. 9. The device of claim 1 wherein the vibrator utilizes sealed bearings to permit rotation of the eccentric within the vibrator case. 10. The device of claim 1 wherein the vibrator is chosen from a plurality of vibrators of varying lengths and diameters, each of the plurality of vibrators being configured for attachment to the semi-rigid shaft case. 11. The device of claim 1 and further comprising a mount for mounting the internal combustion engine to the concrete finishing tool and an elongated handle for manipulating the concrete finishing tool and internal combustion engine as a unit. 12. The device of claim 11 and further comprising an attachment for coupling the handle to the finishing tool, said attachment permitting selective alteration of the vertical angle between the concrete finishing tool and the longitudinal axis of the handle. 13. The device of claim 11 wherein the mount is configured to couple the vibrator to the concrete finishing tool. 14. The device of claim 12 wherein the mount is configured to transfer vibrations from the vibrator to the concrete finishing tool. 15. The device of claim 11 wherein the mount is figured to permit coupling of the attachment and the vibrator at substantially the same position between the ends of the concrete finishing tool. 16. The device of claim 14 wherein the mount provides structural support to the concrete finishing tool. 17. The device of claim 11 and further comprising a remotely actuatable throttle control. 18. The device of claim 17 wherein the remotely actuatable throttle control is configured to control actuators powered by power scavenged from the engine's magneto circuitry.