Tool and tool holder for hand-tool apparatus
US5397203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1993 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Jul 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/907
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The tool for a tool holder of hand tools used for chiseling and/or percussion drilling has a chucking shank (9). This chucking shank (9) is provided with two rotary driving grooves (10) which are located diametrically opposite one another and open axially toward the free end of the chucking shank (9). Also, the chucking shank (9) has two diametrically opposite, axially closed locking grooves (11). In order to increase the total working surface decisive for the transmission of torque, two longitudinal grooves (12) are provided which are likewise arranged diametrically opposite one another and open axially toward the free end of the chucking shank (9). The length of these longitudinal grooves (12) exceeds the length of the locking grooves (11). The axes of symmetry (L) of the longitudinal grooves (12) are arranged at an acute angle (a) to the axes of symmetry (V) of the locking grooves (11). In addition, the flanks (12a) of the longitudinal grooves on the driving side extend in a straight line and tangentially relative to the base of the locking grooves (11) so as to form optimal working surfaces for the transmission of torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.