Cutting by use of rotating axially moving tool – Tool-support – With tool-retaining means
Patent
1982-07-12
1985-04-09
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool-support
With tool-retaining means
408102, 408239A, B23B 3108
Patent
active
045098875
DESCRIPTION:
BRIEF SUMMARY
In many cases it is desirable to fasten a tool to a rotating shaft in machines which are designed such that an adjustable chuck cannot be used. Examples on such machines are multiple spindle drilling machines, in which the tools are to be fastened on adjustable, hinged shafts, machines for drilling deep holes, where a drill of limited length shall be fastened on an extension shaft, percussion rock drill machines in which the tool shall be fastened such that torsional moment as well as shock impulse may be transmitted to the tool; and thread cutting machines and machines for rotating files and grinding rods.
Tool holders for such machines are previously known, for instance conical sleeves, but have appeared to be impaired by substantial disadvantages. Such conical sleeves require that the tool is forced into the sleeve with a large axial force in order that the friction shall be able to transmit the torsional moment. When exchanging tool it has to be separated from the sleeve by forcing in a wedge between the end of the tool shaft and the bottom of the sleeve. In this connection a considerable space for the wedge is required which means that the sleeve has to be provided with a relatively long, weakening slot. Another disadvantage is that under influence of vibrations or shock impulses the contact force between sleeve and tool shaft can be so large that the sleeve is damaged, or that difficulties arise when loosening the tool.
Another usual sleeve design has a cylindrical hole cooperating with a substantially cylindrical tool shaft with one or several flat surfaces. In the wall of the sleeve there are threaded in one or several screws which when tightening are pressed against the flat surfaces of the tool shaft. This construction can transmit axial forces better without difficulties to loosen the tool.
A drawback, however, with this device is that the screws under influence of vibrations can easily get loose, and the wall of the sleeve must be made thick such that the threads of the screws get sufficient engagement, which leads to an unnecessarily heavy and lumbering sleeve. Moreover, the construction is sensible to dust and chips which can easily penetrate between sleeve and shaft.
This invention relates to means for connecting a male part with a female part, the male part preferably comprising a tool with a shaft, for instance a drill, a countersink, a shank end mill, a tap, a reamer, a rotating file and grinding rods, and the female part preferably a tool holder which is similar to a sleeve. The device can transmit torsional moment as well as axial forces, is easy to loosen without aids, allows a very small outer diameter on the sleeve and is insensible to dust and chips.
A preferred embodiment of the invention shall be described more closely in connection with accompanying drawings, in which
FIG. 1 is a side view of a tool, in this case a countersink,
FIG. 2 is a side view of the tool after a rotation of 90 degrees,
FIG. 3 is a corresponding tool holder in which the tool is to be inserted, and
FIG. 4 is a section along the line IV--IV.
The sleeve 30 disclosed in the drawing has a substantially cylindrical outer part, which on a suitable place may be provided with two grooves 31, 32 which have been milled out and shall constitute grip surfaces for a spanner or a similar tool during the fastening of the sleeve on a spindle in a drilling machine. The sleeve is preferably screwed on the spindle and for this reason one end part of the sleeve has an inner cavity 33 which is provided with threads 34. In the other end part of the sleeve there is also a cavity 35, which is substantially cylindrical and is intended to receive the shaft of the tool. In the near of the bottom of the cavity 35 there is a pin 36 extending diametrically through the cavity and is fastened in the wall of the sleeve 30. In the fore part of the cavity 35 but a little bit from the mouth of the cavity there is an annular, shallow groove 37 without sharp edges and made in the inner wall of the sleeve.
The tool disclosed in the drawing, as st
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Briggs William R.
Santrade Ltd.
Webb Glenn L.
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