Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1996-05-17
1998-11-10
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 193, 279 59, 408240, B23B 4516, B23B 5100, B23B 3112
Patent
active
058334050
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a new combination of a tool holder and a tool. More specifically, but not exclusively, the invention relates to a drilling tool and a holder therefor, especially a holder of the type comprising a percussion member for transmitting axial percussions to a tool received in the holder.
Thus, the present invention provides a combination comprising a tool holder having radially movable jaws or gripping members defining an axial tool shank receiving passage therebetween, and a tool having a shank portion received in the shank receiving passage of the tool holder, the jaws or gripping members and the shank portion of the tool defining cooperating male and female retaining means for releasably retaining the shank portion of the tool within the shank receiving passage of the tool holder, the female retaining means comprising an annular channel or groove for receiving the male retaining means therein.
The annular channel or groove may be formed in the outer peripheral surface of the tool shank, and radially inwardly extending male retaining means may then be formed on surfaces of the radially movable jaws or gripping members defining the shank receiving passage. Alternatively, the channel or groove opening radially inwardly may be defined in the surfaces of the jaws or gripping members defining the shank receiving passage, and the cooperating male retaining means, for example in the form of one or more axially extending projections or a peripherally extending annular collar or flange, may extend radially outwardly from the peripheral outer surface of the tool shank.
The jaws or gripping members of the tool holder and the shank portion of the tool may further comprise cooperating first and second torque transmitting surfaces, respectively, for transmitting a driving torque from the tool holder to the tool shaft so as to rotate the tool about its longitudinal axis.
The said second torque transmitting surface may be a circularly cylindrical surface of the tool shank, and in that case the jaws or gripping members may be moved into tight engagement with the cylindrical tool shaft so that frictional forces between the gripping members and the tool shaft may be used for transmitting the driving torque from the tool holder to the tool shaft.
In the preferred embodiment, however, the shank portion of the tool comprises a section having a polygonal (preferably a regular polygon) cross-section and defining substantially flat side surfaces serving as said second torque transmitting surfaces.
Preferably, the second torque transmitting surfaces comprise three substantially flat side surfaces of the tool shank being substantially parallel with the longitudinal axis of the tool shank, each adjacent pair of said three side surfaces defining an angle therebetween of about 60.degree.. Thus, the cross-section of the tool shank may be a regular triangle or a regular hexagon.
The tool holder may comprise three gripping members or jaws defining three corresponding flat first torque transmitting surfaces which also define mutual angles of about 60.degree..
The tool holder may comprise an axially reciprocatable percussion member for applying axial percussions to the tool received in the tool receiving passage. In such case it is important that the tool is allowed to perform a reciprocating axial movement in relation to the gripping members or jaws of the tool holder. Therefore, the axial width of the annular channel or groove formed in the tool shaft or in the gripping members of the tool holder preferably substantially exceeds the axial extension of the male retaining means cooperating therewith.
The jaws or gripping members of the tool holder may be radially movable in any suitable manner. As an example, each jaw or gripping member may comprise a guide member being movable in a radially extending guide passage defined in the tool holder. Position adjusting means, such as screw members, may then be used for adjusting the radial position of the gripping members or jaws. However, care should be taken or means
REFERENCES:
patent: 3767218 (1973-10-01), Linthicum et al.
patent: 4146240 (1979-03-01), Nielsen
patent: 4232985 (1980-11-01), Nielsen
patent: 4273344 (1981-06-01), Benson et al.
patent: 4434859 (1984-03-01), Rumpp et al.
patent: 4491445 (1985-01-01), Hunger et al.
patent: 4508180 (1985-04-01), Klueber
patent: 4536109 (1985-08-01), Hunger et al.
patent: 4548278 (1985-10-01), Gidlund
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