Merz Ag Dulliken

Dihart Ag

Istvan Vig

In the known, adjustable, single-cutting-edge machine reamers having a turnable cutting plate, the adjusting and re-adjusting operations are awkward and associated with difficulties because, at least as far as adjusting is concerned, adjustments have to be made at two points, and moreover for adjusting to the set desired value it is generally necessary to proceed in a step-by-step manner, gradually working ones way up to the desired value. These problems are due to the fact that adjustment can in principle only be made in the forward direction, that is to say in the direction of increasing diameter, whereas reverse adjustment in the proper meaning of the term is not possible but can only be achieved indirectly by carrying out a new adjustment with a lower starting value and adjusting in a forward direction. These problems and other disadvantages of these reamers are eliminated by a new overall concept employing a turnable cutting plate (3) in the form of an equilateral polygon, said turnable cutting plate being adjustable by means of an adjustable stop and an fixed stop (15, 14) on the polygon-sides (45, 44) of the turnable cutting plate inclined toward each other and a securing screw (17) for the turnable cutting plate acting as a springy restoring element and hence also enabling reverse adjustment to be effected.

Adjustable machine-reamer

A reamer having a tool shank and a detachable reamer head in which the shank is provided at one end with means to be engaged by the spindle of a machine tool and at the other with a sleeve defining a conical socket and the reamer head has an integral conical butt for engagement in the shank socket, the butt being detachably secured in the socket by means of a rigid force transmitting member extending lengthwise of the tool shank and connected at its ends to the reamer head butt and an axially movable screw threaded counterpiece engaged in screw threaded fashion on the shank so that rotation of the screw threaded counterpiece exerts a longitudinal force to draw the reamer head butt into and out of the conical head socket. Cooperating detent means are provided on the reamer head butt and tool shank sleeve to prevent relative rotation therebetween. The force transmitting member can take the form of a rod extending within a coaxial bore within the tool shank and threadwise engaged at one end with the butt and connected to the counterpiece at the other. In one embodiment, the connection can be a sliding one, the rod having an integral transversely extending cross-piece which is engaged between the parts of a double collar threaded on the tool shank. In another embodiment, the member can have a direct threadwise connection with a threaded socket at the base of the conical socket, a lengthwise passage being provided axially through the reamer head and butt to allow the member to be mechanically engaged and rotated.

Reamer

A reamer is provided with substantially helical extending carbide-bladed teeth by forming a reamer body having roughly shaped helical teeth thereon along the front face of each tooth a groove extending rectilinearly lengthwise and obliquely to the reamer axis, inserting into each such groove a small straight carbide strip shaped to fit snugly within the groove, the height of the strip being such that its upper end projects radially, over its whole length, above the tooth end and also beyond the extended diameter of the reamer, such strip also extending obliquely of the reamer axis, and subjecting each such strip to a grinding operation in which its upper end projecting beyond the reamer diameter is first rounded off to conform to the reamer diameter and a first cutting edge is formed at the leading edge thereof, and then the end portion of the strip is separately ground to produce a main cutting edge inclined at an angle to said first cutting edge in the direction of said reamer axis.

Growing community of inventors

Olten, Switzerland

Istvan Vig