Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1991-11-06
1992-12-29
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 76, B23B 4514
Patent
active
051746905
DESCRIPTION:
BRIEF SUMMARY
This invention relates to power tools. More particularly, the invention relates to a mobile power tool mounting assembly and a method of using same.
In the case of mobile power tools, such as drills, there is a requirement for some simple means to enable the tool to be mounted and held at a selected location for performing a material treatment operation, such as drilling, while then being able to release the tool so that it can be moved to another location on the workpiece for a subsequent operation.
An electro-magnetic system for mounting the power tool on a ferro-magnetic workpiece solves the problem of secure clamping to the workpiece and subsequent release. However, such an arrangement has attendant shortcomings including the fact that an electro-magnetic system cannot be used in fire-hazardous locations (due to the inevitable spark danger), and such systems carry with them other dangers including the possibility of the power tool falling from a non-horizontal workpiece and injuring a worker, if the power supply to the electro-magnet is accidentally interrupted.
A proposal has been made for the provision of a permanent magnet system for holding power tools to a work piece. According to this prior proposal a large and heavy permanent magnet is loosely mounted within a box or casing of ferro-magnetic material, which is closed at the base by alternate strips of steel and brass. A lever mechanism mounted on the top of the box is connected to the magnet within by a lift link. The lever can be lowered to raise the magnet within the box, and vice versa. There is provided, on the top surface of the box, a mounting plate for a power tool.
Numerous shortcomings of this prior proposal include the following. Firstly, the use of a box for containing the magnet is adopted in order to be able to apply the necessary lifting force to the magnet for disengagement of it from the workpiece. However, there is a direct technical penalty arising from this arrangement for actuating the magnet, namely that the magnetic attraction force acting between the magnet and the workpiece is greatly reduced. As a result, the technical specification of the equipment is necessarily limited to ensure that the power tool does not apply more torque than the magnetic attraction will resist. Also, a large magnet is required in order for the unit to be practical at all, and this increases the overall size of the boxed magnetic unit and therefore limits its utility in relation to working on certain smaller workpieces such as relatively narrow girders.
A further factor in relation to this prior proposal concerns the lever actuation mechanism. This mechanism is simple to actuate, but operates in an on/off manner. As a result, there is no intermediate "partially on/partially off"condition in which sufficient attraction between the magnetic workpiece is maintained to permit position-adjustment of the magnet and tool while retaining same on the workpiece. While this is not a problem when working on horizontal surfaces, it is of great practical significance and has safety implications when working on vertical surfaces and on horizontal surfaces which face downwardly.
An object of the present invention is to provide a mobile power tool mounting assembly, and a method of using same, offering improvements in relation to matters discussed herein, or generally.
According to the invention there is provided a mobile power tool mounting assembly, and a method of using same, as defined in the accompanying claims.
There is disclosed in U.S. Pat. No. 3,014,751 (Smith) a magnetic device for the handling of sheet material and the like that is responsive to magnetic attraction, such as sheet iron, steel, or the like. It is mentioned in the specification that the invention may provide a permanent magnet device which may be attached to a part of a wood working machine, such as the steel or iron bed of a power saw, for properly positioning the piece of material being worked on. There is provided, as part of the magnetic device, lever means pivotally mounted at one sid
REFERENCES:
patent: 2820377 (1958-01-01), Buck
patent: 3969036 (1976-07-01), Hougen
patent: 4664565 (1987-05-01), Palm
Bagshaw Roger
Targett Derrick R.
Howell Daniel W.
Targett Power Equipment Services (Scunthorpe) Limited
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