Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Patent
1991-10-07
1993-10-19
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
173 71, 408 67, 408204, B25D 1718
Patent
active
052539610
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a drilling device in which the force is transmitted from a hollow-cylindrical drive member to a tubular shank equipped with a drill bit.
Applicant's own European Patent Application No. 0,235,581.A1 discloses a simplification and improvement of the coupling and efficiency of drilling devices operated with such a device in that a first coupling member and a second coupling member are equipped with hollow-cylindrical coupling regions which can be pushed into one another for coupling purposes; facing end faces of the two coupling members have clamping faces that are arranged perpendicularly to the axis of the drill pipe and can be pressed against one another; and the first coupling member is provided with projections while the second coupling member is provided with recesses, grooves or cutouts which engage in one another during coupling, and a clamping ring is provided on the first coupling member to produce the pressing effect. This clamping ring is rotatable by means of a screw connection that is disposed on the first coupling member and is thus mounted so as to be displaceable in the axial direction, with one end face of the clamping ring forming one of the clamping faces. This prior art arrangement has been found acceptable in practice.
It is also known to combine drilling devices with suction devices for the drill cuttings or with flushing devices. However, it has been found that drilling operations employing such prior art drilling devices must be interrupted frequently because the extraction paths become clogged.
SUMMARY OF THE INVENTION
It is an object of the invention to improve the efficiency of the drilling device with respect to the passage of cooling fluids during wet drilling and with respect to the extraction of the drill cuttings or drilling dust during air drilling.
In a drilling device in which the force is transmitted from a hollow-cylindrical drive member to a tubular shank equipped with a drill bit, the invention resides in that the drive member is rotatably mounted in a housing; the housing is provided with a connecting member for a suction device or the like; the interior of the drive member is connected with the connecting member by way of holes in its walls; and the flow path is provided with means to prevent clogging.
In a preferred embodiment of the invention, the wall of the drive member is extended beyond the region provided for a connection with the tubular shank and this extended region is rotatably mounted in the housing by means of two axially spaced bearings. Between the bearing locations, the wall is provided with openings for the passage of the stream of extraction air and in this region, the housing has a connecting opening for the suction hose. The rotatable wall of the drive member is provided with shaft securing rings (Seeger rings) on both sides of the housing so as to prevent longitudinal displacement or contact between the housing and other rotatable components mounted on the drive member, such as the clamping ring or the like. If there were contact between clamping ring and housing, the danger of "seizing" of the two parts would exist. The it would be difficult to separate the two components.
One means for avoiding clogging of the flow path is, for example, a deflection member having a conical tip which is inserted into the interior of the drive member in such a way that the cone tip lies approximately in the plane of the center points of the holes in the wall of the drive member and is oriented in the direction toward the tubular shank. Another means is that the transition between the tubular shank and the drive member is configured in such a way that the drilled-out core is unable to block the transition region. This is accomplished, for example, by a projection arranged in the interior of the tubular shank and oriented in the direction toward the drill bit. Moreover, the wall of the tubular shank may be provided with a plurality of holes which permit flowthrough and at the same time conduct away all drill c
REFERENCES:
patent: 4036308 (1977-07-01), Dellenberg
patent: 4101238 (1978-07-01), Reibetanz et al.
patent: 4189013 (1980-02-01), Adams et al.
Patent Abstract of Japan, vol. 5, No. 70, May 12, 1981, JP 56-19226, Mitsubishi Denki K.K.
Bishop Steven C.
Geissler & Kuper Gesellschaft mit beschrankter Haftung Diamantwe
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