Other

Hertel Ag Werkzeuge+hartstoffe

Karl Hertel Gmbh

Karl Hertel

Gunther Hertel

Gerhard Rall

Hermann L Kastner

Broach

A drive unit for a rotary tool, which unit includes a housing, a drive shaft mounted in the housing for transferring rotational drive force from a rotary drive to the tool, and a clamping mechanism mounted in the housing for generating a tool clamping movement along the axis of the drive shaft. The drive shaft is a hollow shaft, the clamping mechanism includes a pull rod mounted in the drive shaft and coaxially positioned relative to the drive shaft, the pull rod being mounted to be axially displaceable and fixed against rotation relative to the drive shaft, and the unit further includes a blocking device operative between the drive shaft and the housing for permitting the drive shaft to rotate relative to the housing only when the drive shaft is coupled to the rotary drive.

Drive unit for rotary tools

A composite tool unit comprising a tool shank, a tool head a chuck, a drawbar which is slidable in the longitudinal direction of the tool shank and a pulling shank which projects from the tool head. The drawbar and pulling shank are engaged around by the chuck, which is disposed in the tool shank axially to slide between an opening position and a closure position. The tool shank comprises an inner conical face which tapers in the direction of the drawbar and co-operates with outer conical segments disposed on the clamping jaws. The zones of the drawbar 8 and pulling shank 8 of the tool head engaged around by the chuck have respective projections. The flank of the radial projection of the drawbar which is remote from the tool head registers in each position of the clamping jaws with radially inwardly extending projections thereof to transmit an axial pull to the clamping jaws, whereas the projection of the pulling shank in relation to the clamping jaw projections registers only in the closure position of the chuck. The tool head is pulled via the drawbar, the chuck and the pulling shank into a positive connection (Hirth-type serrations) with the tool shank.

Composite tool unit for chip-removing machining

A cutting tool bit has at least one cutting edge formed by an abutment edge between an end face and a side face; a cutting face adjoining the cutting edge and more than two chip breaker steps bounded by step edges and extending approximately parallel to the length dimension of the cutting edge and ascending from the cutting face towards the bit center. The chip breaker steps are arranged in a terraced manner and each step edge has a wavy shape along its length.

Cutting tool bit

A cutting tool comprising a cutting bit, a tool holder having a cutting bit receiving recess and a clamping member for clamping the cutting bit in the recess of the tool holder. The flank surface of the cutting bit remote from its cutting edge has two recesses therein, the bottom surfaces of which extend inwardly of the cutting bit at an acute angle with respect to a lower, seating face of the cutting bit. Two toe dogs are provided on the clamping member and engage in the recesses of the cutting bit with flat contact with the bottom surfaces of the recesses to position the cutting bit in the cutting bit receiving recess.

Cutting tools

In a cutting element for cutting metals and having adjacent surfaces which meet to form a cutting edge, with a chip-controlling groove being formed in one of the surfaces, the groove being composed of a plurality of depressions disposed parallel to one another, spaced apart in the direction of the groove width, and extending along substantially the entire cutting edge, the ability of the groove to effectively deflect chips having a wide range of thicknesses, or cross sections, is improved by forming the groove to have more than two such depressions, with the depressions arranged to form a ridge between each two adjacent depressions, the ridges being located such that, in the direction extending away from the cutting edge, each succeeding ridge is at a higher elevation than the preceding ridges.

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Nurnberg, Germany

Karl Hertel