Tool driving or impacting – Means to drive tool about an axis – Gear drive
Patent
1993-05-17
1996-07-09
Smith, Scott A.
Tool driving or impacting
Means to drive tool about an axis
Gear drive
173217, 173 42, B23Q 510, B25F 500
Patent
active
055335810
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electric hand tool, particularly a drill.
More particularly, it relates to an electric hand tool which has a housing, an electric motor accommodated in the housing and having a motor shaft, and a work spindle driven by the electric motor via a transmission gearing and carrying a tool receptacle.
Drills of this type are usually constructed as straight-drilling machines in which the drill spindle extends parallel to the motor shaft and axis of the housing and, for specific purposes, as angular-drilling machines in which the drill spindle is aligned at a right angle to the motor shaft and housing axis. In certain applications in which both straight and angular drilling must be carried out, as is the case in installations in American wooden house construction, the two machines must be at hand for continuous alternation.
A tool receptacle head serving as special accessory for a conventional drill is already known from DE 36 34 734 A1. It includes two separate housing parts having a hollow space which are located opposite one another and guided along a diagonally extending dividing plane. One housing part carries a support for a drive shaft and the other housing part carries a support for a power take-off shaft which projects out of the tool receptacle head and carries a drill chuck. The drive shaft and power take-off shaft are connected with one another by a double cardan or universal joint so as to be rigid with respect to torsion relative to one another. One hollow-cylindrical housing part of the tool receptacle head is placed on the spindle neck of the drill and the drill spindle of the drill is coupled with a driver by means of a double edge. The driver sits on the drive shaft so as to be fixed with respect to rotation relative to it. In the basic position of the two housing parts, the axes of the drive and power take-off shafts are flush with one another. Due to the relative rotation of the two housing parts, the power take-off shaft can be aligned in such a way that its axis encloses an acute or right angle with the axis of the drive shaft.
A standard drill can be re-tooled with this known tool receptacle head so as to form an angle drill which can also perform straight drilling.
While such a separate tool receptacle head serving as attachment is well-suited to the requirements of the home worker, it is not acceptable for professional machines.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electric hand tool, particularly a drill of the above mentioned type, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an electric hand tool of the above type in which in accordance with the present invention the housing is divided along a dividing plane so that the front housing part which contains a bearing for the work spindle and a rear housing part which contains the electric motor can rotate relative to one another in such a way that the work spindle projecting in the front housing part can occupy any angle between 0.degree. and 90.degree. or more relative to the motor shaft and the housing axis, a catch lock can be unlocked and locked manually for stopping the housing parts in a selected swivel position, and a torsionally rigid transmission of force from the motor shaft to the electric motor to the work spindle is realized in the transmission gearing in every swivel position of the housing parts.
When the electric hand tool is designed in accordance with the present invention, it; has the advantage of being a compact, convenient electric tool for professional requirements which at first glance does not differ from a standard electric tool, but in contrast to the latter allows an angular position of the work spindle relative to the motor shaft and housing axis between 0.degree. and 90.degree. (flush and at a right angle). This electric tool can be used
REFERENCES:
patent: 1978369 (1934-10-01), Levin
patent: 2348266 (1944-09-01), Selby
patent: 2414637 (1947-01-01), Crump
Barth Walter
Fuchs Rudolf
Langenfelder Frank
Martinez David M.
Robert & Bosch GmbH
Smith Scott A.
Striker Michael J.
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