Power trowel
US4629359A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1985 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | May 31, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/454
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The power trowel of this invention has a chassis comprising a gear box and a prime mover and has a plurality of blades which engage a surface to be finished and which are driven by the prime mover, through the gear box, for substantially edgewise rotation about a vertical axis. An elongated handle for controlling movements of the machine across the surface has a pivotal connection to the chassis to be swingable up and down, but has an upper limit of such motion from which it is swingable downwardly. An elastically compressible shock absorber, confined between the handle and the chassis under compressive preload, tends to maintain the handle at that limit and is further compressed by downward force on the rear end of the handle. The center of gravity of the chassis is spaced forward of the vertical axis. Control of machine movements is minimally influenced by machine vibration, and is therefore more precise and less fatiguing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.