Abrading – Frame or mount – Portable abrader
Patent
1993-10-21
1995-02-07
Kisliuk, Bruce M.
Abrading
Frame or mount
Portable abrader
451360, 451451, B24B 2300
Patent
active
053866673
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a portable machine tool, in particular an angle-grinding machine.
More particularly, it relates to a portable machine tool which has a drive spindle bearing a tool receiver and mounted in a bearing flange with a clamping neck, and a protective hood which at least partially covers the tool and is held securely against rotation on the clamping neck.
In a known portable machine tool of this type (DE 3,744,219 A1), the protective hood fitted with a passage opening onto the clamping neck is held so as to be axially non-displaceable between two retaining rings which are secured by a spring ring which is inserted in an annular groove worked into the clamping neck. For securing the protective hood against rotation, a lever is fastened non-rotatably on the clamping neck, which lever engages with a nose in a positive-locking manner in bores or grooves in the protective hood. By lifting the nose out of the respective bore, the protective hood can be rotated about the axis of the clamping neck into a desired position. After release of the lever, the nose engages in a further bore or groove, and the protective hood is fixed in this new rotary position.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a portable machine tool, 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 a portable machine tool in which the protective hood bears a sleeve-shaped plug-on collar which is pushed on the clamping neck and engages with radial projections in an annular groove in the clamping neck, and the axial grooves are provided in the clamping neck and start from the free end face, open out into the annular groove and arranged and constructed so that they allow passage of the radial projections 18 in a plug-on position which is rotated relative to the position of use of the protective hood.
When the portable machine tool is designed in accordance with the present invention, it has the advantage that the protective hood can be removed from the portable machine tool and connected to the latter again without the use of an assistant tool. The handling required for this purpose can be carried out in a simple and time-saving manner. After release of the locking device, the protective hood only needs to be rotated into its plug-on position and can then be removed axially from the clamping neck. The connection operation of the protective hood with the portable machine tool takes place in the reverse direction. The connection of the protective hood to the portable machine tool is constructionally considerably simpler and requires far fewer individual parts. In total, the protective hood with a connecting element to the portable machine tool can be produced more cost-effectively, is smaller in construction and lighter and leads, in total, to a lower weight of the portable machine tool.
According to a preferred exemplary embodiment of the invention, a spring element which is sprung in the axial direction is held securely against rotation on the clamping neck, which spring element is supported, on the one hand, on the bearing flange of the portable machine tool and, on the other hand, on the end face of the plug-on collar facing away from the protective hood. The one locking member of the locking device is constructed on the spring element, specifically as a locking nose projecting axially away from the spring element, and the corresponding locking member is formed by at least one recess which is arranged in the end face of the plug-on collar facing the spring element and into which the locking-nose protrudes in a positive-locking manner. By means of these constructional measures, the manual locking device can be implemented in a very simple and cost-effective manner. If a plurality of equidistantly arranged recesses are provided, which are distributed over part of the circumference of the plug-on
REFERENCES:
patent: 1638459 (1927-08-01), Ritz
patent: 4059930 (1977-11-01), Alessio
patent: 4574532 (1986-03-01), Haberle et al.
patent: 5005321 (1991-04-01), Barth et al.
patent: 5031325 (1991-07-01), Walter et al.
Hausslein Friedrich
Rohrup Peter
Steinbruck Egbert
Banks Derris H.
Kisliuk Bruce M.
Robert & Bosch GmbH
Striker Michael J.
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