Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Reexamination Certificate
2003-01-30
2004-09-21
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
C173S048000, C173S104000
Reexamination Certificate
active
06793023
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on a hand power tool.
A hand power tool of this type is known (DE 198 03 454 A1). A drilling spindle capable of being driven by the drive motor is capable of being stopped in torsion-resistant fashion relative to the housing of the hand power tool by means of the arresting mechanism, so that a tool mount, e.g., a drilling chuck, screwed together with the drilling spindle can be loosened from the drilling spindle and/or a tool can be clamped in the tool mount in keyless fashion. The arresting mechanism is located on an intermediate shaft that is capable of being coupled with the drilling spindle via two gear stages. The arresting mechanism opens automatically when torque is transferred from the drive motor in the direction toward the tool mount, and it locks automatically when torque is transferred from the tool mount toward the drive motor.
SUMMARY OF THE INVENTION
The hand power tool according to the invention has the advantage that a safeguard against overload-into the torm of the safety clutch that operates in the torque-dependent fashion-for the operator is created if the drilling spindle suddenly lams, e.g., if the drill bit becomes stuck. In addition, a safeguard against overload is therefore obtained that protects the gear mechanism and/or the arresting mechanism against overload. Since the safety clutch is incorporated in the arresting mechanism, practically no additional expense is required for the safety clutch. Nor is any additional installation space required in the machine housing, nor does the machine housing have to be specially adapted for the installation space required therefore. As a further result of the integration, as few components as possible are required for the arresting mechanism and the safety clutch. Overall, despite the addition of the safety clutch, practically no additional assembly expense or costs are required.
Further details and advantages of the invention result from the subsequent description of the drawing and the drawings in which an exemplary embodiment of the invention is presented. The drawings, the description, and the claims contain numerous features in combination. One skilled in the art will advantageously consider them individually as well and combine them into reasonable further combinations.
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patent: 0 566 926 (1993-10-01), None
Holzer Peter
Simm Robert
Robert & Bosch GmbH
Smith Scott A.
Striker Michael J.
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