Abrading – Frame or mount – Portable abrader
Reexamination Certificate
1999-04-23
2001-01-30
Banks, Derris H. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S359000
Reexamination Certificate
active
06179696
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a powered oscillating hand tool, in particular a powered oscillating hand tool comprising a drive unit having an electric motor with a drive shaft to which a sander head can be attached.
2. Description of the Prior Art
In conventional sanders of the orbital type, with a shaped shoe, the drive system comprises an eccentric which is restrained so that the sander shoe cannot spin independently of the motor and it therefore describes a regular orbit. The shoes of such sanders are available in a range of shapes and such sanders are in general used for the removal of relatively small quantities of material, for example for detailed work or for finishing. The base of the shoe may be provided with a surface, in particular a hook and loop surface, on which an abrasive sheet may be mounted.
European Patent No 610 801 describes a sander which carries a triangular shoe which can be detached from the body of the sander by means of an operating button located at the front corner of the sander. The operating button carries a bolt which is resiliently mounted on the tool and is biased towards engagement under a catch hook provided in the triangular shoe. The sander is further provided, on the edge opposite the operating button, with at least one engagement opening for engaging at least one support claw provided on the triangular shoe.
It is a disadvantage of such an arrangement that it is expensive to manufacture and may be difficult to operate to attach and detach the shoe, in particular under the conditions in which the sander is likely to be used.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a sander in which the above disadvantages are reduced or substantially obviated.
The present invention therefore provides a powered oscillating hand tool comprising
(a) a drive unit having an electric motor and a drive shaft;
(b) a bearing eccentrically mounted on the drive shaft and located radially eccentrically relative to the drive shaft;
(c) a carrier plate mounted on the bearing and
(d) a platen for mounting on the carrier plate characterised in that the carrier plate is provided with a first engagement means and the platen is provided with second engagement means to engage with the first engagement means by rotation of the platen relative to the carrier plate.
The first and second engagement means preferably together form a bayonet fitting, more preferably a bayonet fitting of the type in which the first engagement means (provided on the carrier) is in the form of one or more apertures and the second engagement means is in the form of one or more hook members.
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Banks Derris H.
Black & Decker Inc.
Shapiro Bruce S.
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