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US 8,460,070 B2Granted
Guard lock
AssigneeRobert Bosch GmbH
InventorsCornelius Boeck, Joachim Schadow, Sinisa Andrasic
Life of this patent
Estimating the term…
Abstract
The invention relates to a protective hood securing device for a portable power tool (12), especially an angle grinder. Said protective hood securing device comprises a protective hood unit (14), having a protective hood (16), and a securing unit (18) having at least one securing element (20) which is provided together with the protective hood unit (14) for protection in the event of a tool (22) breakage. For this purpose, the securing element (20) is at least partially configured by a protective cover (24) that is provided in addition to the protective hood (16).
Claims25
An angle grinder with a tool rotatably drivable about an axis, a guard device comprising
- a guard fixedly connectable to the hand-held power tool, said guard extending over a first angular range around a guard axis which is arranged to substantially coincide with the axis of rotation of the tool so as to cover at least a part of the tool to protect a user;
- a protective cover extendable over a second angular range around said guard axis and rotatable relative to said guard about said guard axis, so that in one position said protective cover is located within said guard substantially in a same angular region, and when rotated relative to the guard, said protective cover is located in another, circumferentially neighboring angular region so as to cover jointly with said guard a greater angular range than said first angular range;
- and
- guide means for guiding said protective cover during its rotation relative to said guard and including respective guiding elements on said protective cover and on said guard that interact with one another during the rotation of the protective cover relative to said guard to guide the protective cover;
- wherein said protective cover is mounted rotatably on said guard so that if the tool breaks during operation and if a piece from the broken tool strikes said protective cover, said protective cover rotates relative said guard;
- and
- wherein said protective cover and said guard device extend around an entire angular range of the tool of 360° when in a protective position.
4 more elements
A guard device for a angle grinder having a tool rotatably driveable about an axis of rotation, the guard device comprising
- a guard fixedly connectable to the hand-held power tool and extending over a first angular range around a guard axis, which is arranged to substantially coincide with the axis of rotation of the tool, to cover at least a part of the tool to protect a user;
- a protective cover extendable over a second angular range around said guard axis and rotatable within and relative to said guard about said guard axis and the axis of rotation of the tool;
- and
- guide means for guiding the protective cover during its rotation relative to said guard and including respective guiding elements on the protective cover and on said guard that interact with one another during the rotation of the protective cover relative to said guard to guide the protective cover;
- wherein the protective cover is configured so that in case the tool should break into pieces that are outwardly slung, and one of the pieces of the tool strikes said protective cover, said protective cover absorbs forces imparted by the striking piece of the tool and rotates by said guide means relative to the guard according to the imparted forces to cover jointly with said guard a greater angular area of the tool than covered separately by the guard and to protect a user thereby;
- and
- wherein said protective cover and said guard device extend around an entire angular range of the tool of 360° when in a protective position.
4 more elements
A guard device for a angle grinder having a tool rotatably drivable about an axis, the guard device comprising
- a guard fixedly connectable to the hand-held power tool, the guard extending over a first angular range around a guard axis which is arranged to substantially coincide with the axis of rotation of the tool so as to cover at least a part of the tool to protect a user;
- a protective cover extendable over a second angular range around the guard axis and rotatable relative to the guard about the guard axis, so that in one position the protective cover is located within the guard substantially in a same angular region, and when rotated relative to the guard, the protective cover is located in another, circumferentially neighboring angular region so as to cover jointly with the guard a greater angular range than the first angular range;
- and
- guide means for guiding the protective cover during its rotation relative to the guard and including respective guiding elements on the protective cover and on the guard that interact with one another during the rotation of the protective cover relative to the guard to guide the protective cover;
- wherein the protective cover is configured so that in case the tool should break into pieces that are outwardly slung, and one of the pieces of the tool strikes the protective cover, the protective cover absorbs forces imparted by the striking piece and rotates by the guide means relative to the guard according to the imparted forces to cover jointly with the guard the greater angular ranges and to protect a user thereby;
- and
- wherein said protective cover and said guard device extend around an entire angular range of the tool of 360° when in a protective position.
4 more elements
A guard device for a angle grinder having a tool rotatably drivable about an axis, the guard device comprising
- a guard fixedly connectable to the hand-held power tool, said guard extending over a first angular range around a guard axis which is arranged to substantially coincide with the axis of rotation of the tool so as to cover at least a part of the tool to protect a user;
- a protective cover extendable over a second angular range around said guard axis and rotatable relative to said guard about said guard axis, so that in one position said protective cover is located within said guard substantially in a same angular region, and when rotated relative to the guard, said protective cover is located in another, circumferentially neighboring angular region so as to cover jointly with said guard a greater angular range than said first angular range;
- guide means for guiding said protective cover during its rotation relative to said guard and including respective guiding elements on said protective cover and on said guard that interact with one another during the rotation of the protective cover relative to said guard to guide the protective cover;
- and
- a securing unit providing a securing force to prevent the protective cover from rotating from said one position unless acted upon by a force that exceeds said securing force;
- wherein said protective cover is mounted rotatably on said guard using said securing unit so that if the tool breaks during operation, and if a piece from the broken tool strikes said protective cover and imparts to the protective cover a striking force that exceeds the securing force, said protective cover rotates relative said guard and guided by said guiding means to cover jointly with said guard the greater angular range than said first angular range;
- and
- wherein said protective cover and said guard device extend around an entire angular range of the tool of 360° when in a protective position.
5 more elements
Dependencies are inferred from the claim text.