Patent DE-102009027472-A1 (DE)
Title: Hand drill for operating welding electrodes, comprises a drilling unit in which a drilling tool is arranged, a drive unit having a longitudinal axis and a drive axis arranged angularly to the longitudinal axis, and a concentric drive piece
Inventor: WIECZOREK GARY
IPC: B23C3/00
Filed: 2009-07-06
Abstract: The hand drill comprises a drilling unit (2) in which a drilling tool (5) is arranged, a drive unit, which has a longitudinal axis (4) and a drive axis arranged angularly to the longitudinal axis, and a concentric drive piece (6) arranged to drive axis. The drive piece acts on a gear assigned the drilling unit and transfers a torque on a concentric tool drive wheel with a reception (22) for the drilling tool arranged to a drilling axis. The drive unit comprises an electro motor, which transmits a torque over a reduction gear on the drive piece. The hand drill comprises a drilling unit (2) in which a drilling tool (5) is arranged, a drive unit, which has a longitudinal axis (4) and a drive axis arranged angularly to the longitudinal axis, and a concentric drive piece (6) arranged to drive axis. The drive piece acts on a gear assigned the drilling unit and transfers a torque on a concentric tool drive wheel with a reception (22) for the drilling tool arranged to a drilling axis. The drive unit comprises an electro motor, which transmits a torque over a reduction gear on the drive piece. The reduction gear and the electro motor are arranged along the longitudinal axis. An accumulator is arranged on the drive unit in a row with the reduction drive and the electro motor along the longitudinal axis. The distance between the milling axis and an end section of the accumulator is larger than 40 cm. The milling unit and the drive unit are longer than 50 cm and less extends and/or higher than 10 cm from a projecting handle. The milling unit is measured less than 4 cm around the drilling axis, around parallel to the drilling axis of more flatly than 25 mm. The drilling axis, the drive axis and the longitudinal axis are arranged in a plain. The drilling unit comprises an upper and lower gear cover in whose receptions are arranged for a machine adapter gear and a tool drive wheel. The drilling unit is positively connected by a backup flange in a connecting area and separatable with the drive unit. The upper gear cover is formed in connecting area. The drilling unit comprises a first transition opening in the upper gear cover and a second transition opening in the lower gear cover. The transition opening allows an access for inserting the drilling tool in the tool reception of the tool drive wheel and for the introduction of the welding electrodes towards bottom and top. The machine adapter gear comprises a reception for the drive piece of the drive unit and transmits torque acting on the drive piece on the tool drive wheel. A reception for the drilling tool is arranged in the tool drive wheel. The machine adapter gear and the machine drive wheel are arranged with roller bearing in the reception in the upper and lower gear cover. A level is arranged on the hand drill and comprises a visibility window formed to the external side in concave form and makes bias relative to the drilling axis through a bubble present in a fluid, which has a viscosity of 0.05-300 Pa.s increased against water. The visibility window is leveled in its midpoint, so that the level indicates first inclinations relative to an axis of 2-10 [deg] orthogonally passing through the flat section. A longitudinal handy holding piece is equipped on the hand drill for tightly holding the hand drill. The handle axis passing along the holding piece is arranged near at the right angle to the longitudinal axis of the drive unit. A reception for the handle is equipped on both sides of the hand drill. The reduction gear unit comprises different manually adjustable speed-reducing ratios.