Screw driving method and screw driving apparatus
US5862724A · kind A · utility
Inventors
Key dates
| Filing date | Oct 8, 1997 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Oct 8, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/045
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
When a screw 14 is driven into workpieces 61 and 62, it is possible to reduce any reaction that a driver bit 11 is raised so as to obtain fast and reliable screw driving. In the screw driving method of the present invention, the screw is advanced with a strong pressing force of 7-10 Kg during a period from disengagement step of the screw from a carrier strip 14 to driving step of the tip of the screw to the predetermined depth (the lower surface) of the workpiece 61. When the screw is screwed into the workpiece 62, the driver bit 11 is advanced with a weak pressing force of 2-3 Kg. In a screw driving apparatus of the present invention, the fitted screw is disengaged from a screw carrier strip by means of a forward stroke force of the driver bit. The tip of the screw is driven to a predetermined depth in a workpiece. During the term between the disengagement and the driving of the screw, the driver bit is advised with a strong pressing force by a primary piston 26. Then, the screw 14 is screwed into the workpiece 62 by advancing the driver bit 11 with a weak pressing force by a secondary piston 27 which passing through the center of the primary piston 26. The driver bit 11 is rotate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.