Abrading – Frame or mount – Portable abrader
Patent
1998-04-15
1999-11-30
Eley, Timothy V.
Abrading
Frame or mount
Portable abrader
451357, B24B 2304
Patent
active
059933046
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hand tool which is designed for motorized operation and which is of the type specified for motorized operation and which is of the type specified in the precharacterizing clause of Patent Claim 1.
Such a hand tool comprises, in very general terms, an apparatus housing, a drive shaft part which is mounted rotatably in the apparatus housing and is designed to be driven by some suitable type of motor, a toolholder part which is mounted pivotably in the apparatus housing, is operatively connected to the drive shaft part and has a securing portion projecting from the apparatus housing for a machining tool, for example a file. One end of a shaft journal is secured in the drive shaft part, the said shaft journal being eccentrically positioned in relation to the geometric axis of rotation or centre line of the drive shaft part.
PRIOR ART
Hand tools of a similar type are already known from, for example, Swedish Patent Application 9301273-0, U.S. Pat. No. 2,824,455 and U.S. Pat. No. 4,114,270.
The hand tool which is described in the said Swedish patent application has a securing member for a machining tool, preferably a file. This securing member is driven in such a way that it executes a reciprocating working movement in its longitudinal direction, as a result of which the tool secured in the member is caused to execute a reciprocating machining movement in its longitudinal direction.
A hand tool of this known type is especially suitable for precision machining of workpiece surfaces in the area of edges, corners, grooves or, mainly, at places where different surfaces of the workpiece join one another at an angle, as a result of which the machining space is limited and/or difficult to get at.
However, this known techniques always involves a machining direction which is essentially in line with the longitudinal direction of the hand tool (apparatus) in question. With this known type of hand tool, however, it is not possible to machine material in the transverse direction of the toolholder part without in this case moving the whole hand tool (apparatus) to and fro in a sideways direction.
Furthermore U.S. Pat. No. 5,437,571 discloses an oscillating tool in accordance with the preamble of claim 1.
OBJECTS OF THE INVENTION
An object of the present invention is to make available a novel type of hand tool which is driven by means of a suitable motor and with which it is possible to machine material in a direction transverse to the toolholder part and, consequently, transverse to the machining tool which is held by the toolholder part, and which tool can be, for example, a file suitable for precision machining.
Such reciprocating sideways or lateral movement of the tool is required especially for polishing, fine grinding, precision machining, and other types of finish-machining, of surface areas to which access is difficult, such as in corners, at concave edges, in slots and in recesses.
A further object is to make available a hand tool which works with a sideways pendulum movement and whose apparatus housing can have small external transverse dimensions, so that the tool or the apparatus is compact and therefore easy to handle in confined spaces.
Another object of the invention is to make available a hand tool which works with a sideways pendulum movement and whose working stroke in the transverse direction of the machining tool (for example the file) is adjustable, or in other words a hand-held apparatus whose stroke length (sideways pendulum movement can be adjusted.
DISCLOSURE OF THE INVENTION
According to the invention, the abovementioned objects are achieved by virtue of the fact that the hand tool of the type mentioned in the introduction has the features specified in the characterizing clause of Patent Claim 1.
Further constructional features, which represent further developments of the invention according to claim 1, are evident from the dependent claims.
What is novel, and what distinguishes the hand tool according to the invention, is that the shaft journal secured in
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patent: 4128970 (1978-12-01), Sawrenko
patent: 4686797 (1987-08-01), Hoffman
patent: 5212995 (1993-05-01), Robinson et al.
patent: 5239978 (1993-08-01), Plangetis
patent: 5437571 (1995-08-01), Everts et al.
patent: 5759093 (1998-06-01), Rodriguez
AB Dentatus
Eley Timothy V.
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