Hand-held power tool

• US 6,415,875 B1
• Filed: 01/12/2000
• Issued: 07/09/2002
• Est. Priority Date: 01/12/1999
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Blank, Felix, Klaas, Thomas, Hansis, Georg, Meixner, Gerhard, Thome, Ludwig
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US09/482,134
• Time in Patent Office: 909 Days
• Field of Search: 173/2, 173/176, 173/217, 173/171, 173/104, 173/109, 173/200, 173/201, 173/48, 173/213, 173/117, 173/20
• US Class Current: 173/2
• CPC Class Codes: B24B 23/028 Angle tools
• CPC Class Codes: B24B 45/00 Means for securing grinding wheels on rotary arbors suppression of vibrations in systems F16F15/00; testing static or dynamic balancing of machines G01M1/00
• CPC Class Codes: B24B 55/00 Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition of general applicability for machine tools B23Q11/00; in general F16P
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Abstract

A hand-held power tool has a machine housing, a drive motor, a tool receptacle, a drive strand accommodated in the machine housing and extending between the drive motor and the tool receptacle, and a detection device for detecting an uncontrolled operational condition of the hand-held power tool, and a blocking device which in case of the uncontrolled operational condition form-lockingly connects the drive strand with the machine housing, the blocking device including at least one locking member which is housing-fixed in a rotary direction of the drive strand and at least one locking member which co-rotates in the drive strand so that the locking member and the blocking member are bringable in engagement with one another, the locking member and the blocking member being bringable in engagement with one another axially in direction of a rotary axis of the blocking member.

Claims

1. A hand-held power tool, comprising a machine housing;

a drive motor;

a tool receptacle;

a drive strand accommodated in said machine housing and extending between said drive motor and said tool receptacle;

a detection device for detecting an uncontrolled operational condition of the hand-held power tool; and

a blocking device which in case of the uncontrolled operational condition form-lockingly connects said drive strand with said machine housing, said blocking device including at least one locking member which is housing-fixed in a rotary direction of said drive strand and at least one blocking member which co-rotates in said drive strand so that said locking member and said blocking member are bringable in engagement with one another, said locking member and said blocking member being bringable in engagement with one another axially in direction of a rotary axis of said blocking member.

2. A hand-held power tool as defined in claim 1, wherein said machine housing is provided with a housing-fixed component, said blocking device in the uncontrolled operational condition of said drive strand being form-lockingly connected with said housing-fixed component.

3. A hand-held power tool as defined in claim 2, wherein said locking member has a locking toothing provided with a plurality of blocking teeth, said blocking member device being provided with a blocking toothing having a plurality of blocking teeth.

4. A hand-held power tool as defined in claim 3, wherein said locking toothing and said blocking toothing are formed at end sides of said locking member and said blocking member, said locking teeth and said blocking teeth extending axially.

5. A hand-held power tool as defined in claim 3, wherein said locking toothing and said blocking toothing are formed as radial toothings, said locking teeth and said blocking teeth being oriented radially and formed as inner teeth and outer teeth correspondingly.

6. A hand-held power tool as defined in claim 3, wherein said locking member is coupled with a switching rod and is axially displaceable as a magnet armature of an electromagnet.

7. A hand-held power tool as defined in claim 6, and further comprising a pressure spring arranged between said locking member and said switching rod so as to load said locking member in a direction toward said blocking member with an engaging force.

8. A hand-held power tool as defined in claim 6, wherein said locking member is connected fixedly with said switching rod, and said switching rod being loaded by pressure spring in direction toward said blocking member with an engaging force.

9. A hand-held power tool as defined in claim as defined in claim 1, wherein said locking member forms with said blocking member an engagement axis which coincides with the rotary axis of the blocking member.

10. A hand-held power tool as defined in claim 1, wherein said locking member forms with a blocking member an engaging axis which is offset parallel to the rotary axis of said blocking member.

11. A hand-held power tool as defined in claim 10, wherein said blocking member is disk-shaped and provided with a plurality of end-side recesses which are uniformly distributed in a peripheral direction of said blocking member, said recesses being axially engagable with said locking member.

12. A hand-held power tool as defined in claim 11, wherein said locking member is formed by a pin which is formed at an engaging side on said switching rod, said machine housing having a passage in which said locking member is longitudinally displaceable guided.