Abrading – Frame or mount – Portable abrader
Patent
1997-10-06
1999-12-21
Rose, Robert A.
Abrading
Frame or mount
Portable abrader
451356, 451351, 451344, 451359, 451360, B24B 2300, B24B 2708
Patent
active
060041943
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a hand-held electrical grinder.
In connection with known hand-held electrical grinders of this type with a grinding tool embodied as a triangularly-shaped grinding plate (EP 0 610 801 A1), the locking elements of the quick-action locking device on the holder side have a bar which is of one piece with the operating key, which can be displaced against the force of a pressure spring and which has a recess with two inclined faces constituting a locking protrusion. The locking elements on the tool side are constituted by at least one detent hook, which is formed in one piece from the grinding plate and projects upward from it. With the grinding plate placed on the support face of the tool holder, the detent hook projects into the recess of the tool holder and the locking protrusion grips behind it under the force of the pressure spring. In order to be able to place the symmetrical grinding plate into the tool holder in arbitrary positions, respectively turned by 120.degree., a detent hook is arranged in each one of the three corners of the grinding plate. The interlocking elements arrested on the tool side are constituted by support claws, which are disposed in pairs in each corner of the grinding plate symmetrically in respect to the detent hook, while the corresponding interlocking elements fixed on the holder side are realized by means of two insertion openings, which are arranged on the side of the tool holder opposite the operating key. The operating key is displaced against the force of the spring for changing the grinding tool, because of which the detent protrusion releases the detent hook. Now the grinding plate can be manually pulled off the tool holder. When the grinding plate is reinserted, two of the support claws are inserted into the two insertion openings in the tool holder, and the grinding tool is pressed onto the support surface of the tool holder. In the course thereof the bar is pushed against the force of the pressure spring over the lower run-up inclination at the locking protrusion until the detent hook slides past the locking protrusion. The bar, which then springs back, pushes the locking protrusion behind the detent hook, by means of which the grinding tool is fixed immovably on the tool holder in the axial direction.
SUMMARY OF THE INVENTION
The hand-held electrical grinder with the distinguishing features of the invention has the advantage over this, that the quick-action locking device in accordance with the invention is very cost-effective to produce, impervious to dust, rugged and simple to handle and allows an increased output transfer from the tool holder to the grinding tool, which is held in a manner which is particularly fixed against pull, push and is tilt-resistant. Because of the design of the quick-action locking device in accordance with the invention, it is possible to use special grinding tools, such as flap grinding adapters, grinding tongues or grinding tubes, both during grinding from "below" and from "above" which, in the latter case, means that a grinding force can also be applied via the top of the special tool and absorbed by the tool holder.
By means of further measures, advantageous further developments and improvements of the hand-electrical grinder are possible. In accordance with a preferred embodiment of the invention, the spring wire is pivotably held in a plane parallel with the support surface on the tool holder, and is connected with an operating key. It has a number of radially inwardly directed indentations which essentially correspond to the number of hooks on the tool side and which extend behind the hooks in a pivot position of the spring wire constituting the locked position of the grinding tool. Considerable ease of operation during a tool change and simultaneously a great locking dependability for the grinding tool inserted into the tool holder is achieved by this structural design.
In accordance with a preferred embodiment of the invention, the spring steel is guided in transverse slits
REFERENCES:
patent: 5309682 (1994-05-01), Gutknecht et al.
patent: 5398454 (1995-03-01), Berner
patent: 5470272 (1995-11-01), Kikuchi et al.
patent: 5709595 (1998-01-01), Berger et al.
Bergner Joao
Fuchs Rudolf
Hild Eugen
Nguyen George
Robert & Bosch GmbH
Rose Robert A.
Striker Michael J.
LandOfFree
Electric hand-operated grinder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric hand-operated grinder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric hand-operated grinder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-500076