Hand tool comprising a sensor for emitting a signal when the tool attachment is replaced

• US 20030176147A1
• Filed: 10/08/2002
• Published: 09/18/2003
• Est. Priority Date: 12/01/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Krondorfer, Harald, Heckmann, Markus
• Granted Patent: US 6,860,792 B2
• Time in Patent Office: Days
• US Class Current: 451/5
• CPC Class Codes: B24B 23/022 Spindle-locking devices, e.g. for mounting or removing the tool
• CPC Class Codes: B24B 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: B24B 49/00 Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation B24B33/06, B24B37/005 take precedence; if applicable to other machine tools, B23Q15/00 - B23Q17/00 take precedence

Abstract

The invention is based on a hand power tool, in particular a manually operated right angle grinding machine or a manual circular saw, with a driver mechanism (12), which can operatively connect an inserted tool (16) to a drive shaft (18).

The invention proposes that at least one sensor (10) can detect at least one procedural step in the changing of an inserted tool (16) and can produce a signal.

Claims

1. A hand power tool, in particular a manually operated right angle grinding machine or a manual circular saw, with a driver mechanism (12), which can operatively connect an inserted tool (16) to a drive shaft (18), characterized in that at least one sensor (10) can detect at least one procedural step in the changing of an inserted tool (16) and can produce a signal.

2. The hand power tool according to claim 1, characterized in that the signal can prevent an operation of the driver mechanism (12).

3. The hand power tool according to claim 2, characterized in that the signal can switch off a power supply.

4. The hand power tool according to one of the preceding claims, characterized in that the signal can switch a light source.

5. The hand power tool according to one of the preceding claims, characterized in that the inserted tool (16) can be operatively connected to the driver mechanism (12) by means of at least one detent element (30), which is supported so that it can move in opposition to a spring element (28), engages in an operating position of the inserted tool (16), and fixes the inserted tool (16) in a form-fitting manner, and that the sensor (10) can detect at least one position of the detent element (30).

6. The hand power tool according to claim 5, characterized in that the detent element (30) can be moved in the axial direction (36) in opposition to the spring element (28).

7. The hand power tool according to claim 5 or 6, characterized in that the detent element (30) can actuate an electrical switch element (14) that constitutes the sensor (10).

8. The hand power tool according to claim 7, characterized in that the switch element (14) is disposed so that it cannot rotate in relation to a rotation axis of the drive shaft (18).

9. The hand power tool according to one of the preceding claims, characterized in that the drive shaft (18) can be locked in place by means of an actuating button (22) of a locking device (20) in order to change the inserted tool (16) and that the sensor (10) can detect a position of the actuating button (22).

10. The hand power tool according to claim 9, characterized in that the actuating button (22) is operatively connected to the drive shaft (18) in the rotation direction (32, 34) and the actuating button (22) for locking the drive shaft (18) can connect at least one first part (24), which is operatively connected to the drive shaft (18) in the rotation direction, to a second part (26) that cannot rotate in relation to a rotation axis of the drive shaft (18).