Drill bit
US4717292A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1987 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | May 6, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/907
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A tool such as a drill has a cylindrical shank for insertion in a tool holder of a rotary percussive or other rotary machine, such as a drilling machine. The shank has a first surface extending transversely of the shank from a point of intersection with the periphery thereof and a second surface extending from the first surface at the end of the first surface remote from the point of intersection of the first surface with the periphery of the shank to a point of intersection with the periphery spaced from the point of intersection of the first surface with the periphery. There are two sets of first and second surfaces spaced apart on opposite sides of the longitudinal axis of the shank. The first and second surfaces are flat. The second surfaces are radial and arranged on the same diameter. A plane through the longitudinal axis of the shank at substantially 90.degree. to the first flat surfaces (which are parallel) is intermediate their respective points of intersection with the periphery and the ends from which the respective second flat surfaces extend. Each first flat surface thus provides a large, flat bearing for cooperation with an elongate driving member (a spline or rib) of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.