Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Reexamination Certificate
1999-09-30
2001-02-06
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
C407S047000, C408S197000
Reexamination Certificate
active
06183174
ABSTRACT:
BACKGROUND
1. Field of the Invention
The invention concerns a boring head with a tool body and at least one bit carrier detachably affixed to it. More specifically, the invention concerns such a boring head wherein the at least one bit carrier is slidably mounted for the radial adjustment of the bit on a clamp plate of the tool body. Most specifically, the invention concerns such a boring head with clamping means for clamping the bit carrier against the above-noted clamp plate and with a catch plate arranged on the tool body which collaborates with a corresponding catch plate of the bit carrier for the transmission of torque.
2. Description of the Related Art
A boring head of this type is known as state of the art from U.S. Pat. No. 4,231,691 of the applicant. In this case two bit carriers are provided which are continuously and independently adjustable, axially as well as radially. The tool body has a radially running, continuous channel on an end side in which the two bit carriers are supported for radial displacement and for the transmission of torque. The two bit carriers are clamped axially against the tool body with a clamping screw. The fine axial adjustment of the two bit carriers is accomplished in each case with a set screw which is inserted in an axial threaded boring of the bit carrier and which is supported at its thinner end on an adapter plate of the tool body. The positioning of the set screws on the tool body results in a punctiform support.
U.S. Pat. No. 5,054,970 shows a boring head which also has two bit carriers. For clamping the two bit carriers. Two clamping screws are provided which run at an angle to the axis of rotation of the tool, and, in each case, clamp a bit carrier against the tool body. The two bit carriers are seated in a guide channel of the tool body. For radial and axial adjustment of the bit carrier, two coaxially arranged adjusting screws are provided and arranged in the tool carrier. One of these screws has an eccentric head which lies on a bit carrier on the bottom side. Upon the rotation of this adjusting screw the corresponding bit carrier is moved axially. Here also the bit carrier is supported in a punctiform manner on the above-mentioned eccentric adjusting screw.
U.S. Pat. No. 3,782,849 shows a boring head with two bit carriers which are gear-cogged with each other. The gear-cog engagement of the two bit carriers increases the stability but prevents continuous axial adjustment of the bits.
SUMMARY AND OBJECTS OF THE INVENTION
The invention has the objective of devising an economical boring head of the type mentioned in which the individual axially and radially adjustable bit carriers are supported stably on the tool body for the transmission of torque and which despite this makes simple manipulation possible.
According to the invention, a boring head has a tool body with an obliquely angled outer wedge surface disposed a distance from a catch plate. The tool body outer wedge surface engages and clamps an angled wedge surface of the bit carrier, such that the wedge surface of the tool body exerts a radial clamping force on the bit carrier which clamps the catch plate of the bit carrier radially against the catch plate of the tool body. In the boring head according to the invention, a defined and flat positioning on the tool body is assured for both bit carriers. With each of the above-noted wedge surfaces, a radial force is exerted on the two bit carriers which clamps the two catch plates together. It is essential that this clamping be independent of the axial position of the bit carrier in question. The positioning of these two catch plates is assured in every axial position. In the case of a bit height adjustment, this flat positioning does not change. The two catch plates are necessarily under the tension of the radial force exerted by the above-mentioned two wedge surfaces.
According to another modification of the invention, each catch plate and the wedge surface of the tool body are arranged on an axially projecting extension of the tool body and this extension engages a depression in the bit carrier. In the boring head according to the invention the two bit carriers are not mounted in a channel of the tool body but rather are seated on a projecting and saddle-shaped extension of the tool body. On this extension, the slanted wedge surface and the catch plate are arranged at a distance from each other. The extension engages a corresponding channel-like depression on the bit carrier. In the case of a two-bit cutter, accordingly, two such extensions are provided and each bit carrier has a corresponding channel on the bottom side. Through this modification of the invention the tool body can be made much more compact than before. The previously disturbing side lobes of the channel can be avoided which results in a better removal of cuttings. The most disturbance-free removal of cuttings possible is an essential property of such a boring head. Cleaning is facilitated because of the compact construction.
According to another modification of the invention, the two wedge surfaces are slanted at different angles with respect to the axis of rotation of the tool body for essentially linear positioning of the bit carrier on the tool body. The radial clamping force can be optimally adjusted via a defined angular difference between the two wedge surfaces.
According to one variant of the invention, it is envisaged that the axial adjusting means has an elongated eccentric roll which is rotatably mounted in the tool body and with which the bit carrier collaborates along a linear contact surface. The bit carrier is moved axially by the rotation of this eccentric roll. The contact surface between the roll and the bit carrier is linear and not punctiform. The eccentric roll preferably extends essentially over the entire length of the clamp plate. Upon the adjustment of the axial position, the bit carrier is also pivoted about the also linear contact surface of the two wedge surfaces. This pivoting motion is independent of the radial position of the bit carrier. Even if the radial position is changed, the length of the tool is precisely maintained. Therefore, no secondary correction is necessary.
For the radial adjustment of the bit carrier according to another variant, it is envisioned that the bit carrier has a set screw running transversely to the axis of rotation which can be placed on the clamp screw for adjusting the boring diameter. This clamp screw preferably extends axially into a threaded boring on the tool body and clamps the bit carrier against the tool body.
Other advantageous features maybe derived from the following description, the dependent patent claims, and the drawings.
REFERENCES:
patent: 3782849 (1974-01-01), Mizoguchi
patent: 4043697 (1977-08-01), Eckle
patent: 4231691 (1980-11-01), Pape et al.
patent: 4632609 (1986-12-01), Johne
patent: 5054970 (1991-10-01), Steiner
patent: 5330297 (1994-07-01), Engstrand
Kaiser Heinz
Pape Deiter
Heinz Kaiser AG
Howell Daniel W.
Schnader Harrison Segal & Lewis LLP
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