Drilling hammer having an external mechanism for selectively switching operation between impact drilling and chiseling modes
US7121359B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2003 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Jul 25, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2216/0038
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a drilling hammer comprising a hammer tube (13) that is rotationally drivable inside a housing (10), a striking tool (14) located in the hammer tube (13) and provided with a piston (15) that can driven with a reciprocating motion, and an operating mode change-over switch (35) for the “impact drilling” and “chiseling” operating modes. The hammer tube (13) is decoupled from its rotary drive when in the “impact drilling” operating mode and is secured in the housing (10) in a non-rotative manner when in the “chiseling” operating mode. To obtain a switching mechanism (37) of the operating mode change-over switch (35) having a very flat design and requiring little installation space, an actuator ring (48) is fixed on the hammer tube (13) in an axially displaceable and torsion-proof manner, the actuator ring including at least one radially projecting locking spline (51) on its outer side facing away from the hammer tube (13), the locking spline being capable of engaging in at least one axial recess (52) in the gearbox and in locking toothing (53) in the housing. Rotational motion of a control button (36) of the operating mode change-over switch (35) is con…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.