Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1983-06-09
1985-12-31
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408201, 408203, B23B 5108
Patent
active
045618127
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a novel type of drill, particularly for use in the sheet metal and manufacturing industry, which is of the kind that permits drilling of several aperture dimensions with the same drilling unit.
Certain drilling operations, such as, for example, the drilling of sheet metal panels, such as radio and TV chassis, instrument panels and the like, usually requires holes of various dimensions to be drilled in the same plate. To avoid changing drills for each hole dimension, cone-shaped drill bodies have been proposed which comprise a series of cylindrical sections having a stepwise increasing diameter from the narrow end of the drill body. With such a drill holes having diameters corresponding to the dimensions of the stepwise arranged drill sections of the drill body may be drilled by simply successively drilling a step-by-step larger hole until the desired hole size has been achieved. Drills of this type are, for example, described in the U.S. Pat. Nos. 2,897,696, 3,564,945 and 3,758,222.
These drills have, however, several limitations and disadvantages. Thus, only thin materials, such as thin sheet metal and the like, can be drilled, since the drill body will be unreasonably long if each section is made longer and it in addition shall contain a sufficient number of diameters.
Further, when cutting a larger hole it is necessary to drill through the workpiece with all the underlying drill diameters of the drill, which will be more time-consuming than to conventionally prebore with a smaller drill and then change to a wider drill corresponding to the desired hole dimension. Moreover, the drill body will essentially be unusable, if any of the drill sections is damaged.
According to the invention there is suggested a drill utilizing the advantages of the above described combination drill, i.e. that several hole dimensions can be bored without any exchange of drills, but which lacks the mentioned disadvantages and limitations. This is achieved with a drill of extensible type, comprising a plurality of separate drill members of mutually different drill diameters, which can be put together in any desired combination into a continuous drill body of two or more of the drill members having a stepwise increasing diameter from the outermost drill member. When a number of holes of varying dimensions are to be drilled in, for example, a sheet metal panel, the drill members corresponding to the desired hole sizes are selected and assembled into a continuous drill body, which is then mounted in the drilling machine, generally by means of a mounting adapter in the form of a chuck shaft or the like. A drill is thus provided which is particularly adapted to precisely the hole dimensions to be drilled and consequently contains no unnecessary drill sections. As a result thereof the length of each drill section can be made considerably greater than in the previously known fixed combination drill according to the above U.S. patents without the total drill body becoming unreasonably long for a moderate number of hole sizes. This means in turn that it is possible to drill considerably thicker materials, so that the combinable drill of the invention to a substantial extent can replace conventional fixed drills. Further, one may proceed directly from a small hole to a larger hole without having to drill through the workpiece with all the intermediate drill dimensions as with the fixed combination drill. If any one of the drill members should be damaged, it will only be necessary to replace that very member, while a fixed combination drill as above must be considered as substantially unusable when any one of the drill sections has been damaged.
The attachment of the drill members to each other can be made in various ways, but a suitable embodiment is to make the drill members screwable on to each other by screwing of a central thread tap of a drill member into a corresponding threaded axial central recess of the adjacent drill member. Preferably, the thread taps are arranged on the top part of the drill mem
REFERENCES:
patent: 1620536 (1927-03-01), Gairing
patent: 1643679 (1927-09-01), Roderick
patent: 1747117 (1930-02-01), Klein
patent: 1819949 (1931-08-01), Doehring
patent: 2897696 (1959-08-01), Tisserant
patent: 3153356 (1964-10-01), Dearborn
patent: 3712753 (1973-01-01), Manzi
patent: 3758222 (1973-09-01), Oakes
Webb Glenn L.
Weidenfeld Gil
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