Screw fastening device
US5178046A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1991 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Jul 26, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2001/323
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A screw fastening device comprising a casing, a motor connected to the casing, a block body rotatably housed in the casing and having a pair of axially spaced plate portions, a plurality of torque transmitting pins each rotatably supported on the plate portions of the block body, the pins having eccentric cam portions, respectively, and being rotated by the motor, an externally toothed gear formed with engagement portions engaged by the eccentric cam portions of the torque transmitting pins, an internally toothed gear fixedly mounted in an inner periphery of the casing so that it can engage with the externally toothed gear, the internally toothed gear being slightly different in number of teeth from the externally toothed gear, and a rotational output shaft connected to either one of the plate portions of the block body. The externally toothed gear is given an eccentric motion and rotated by the rotations of the torque transmitting pins, and the block body is rotated by the rotation of the externally toothed gear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.