Use block for a handheld work apparatus

• US 8,836,471 B2
• Filed: 12/05/2011
• Issued: 09/16/2014
• Est. Priority Date: 12/06/2010
• Status: Active Grant

• Current Assignee: Andreas STIHL AG & Company KG (Stihl Holding AG & Company KG)
• Original Assignee: Andreas STIHL AG & Company KG (Stihl Holding AG & Company KG)
• Inventors: Neubauer, Andreas, Bker, Robert
• Primary Examiner(s): Ghayour, Mahammad
• Assistant Examiner(s): RUSHING, MARK S
• Application Number:
  US13/311,200
• Publication Number:
  US 20120139692A1
• Time in Patent Office: 1,016 Days
• Field of Search: 340/5.2, 340/5.21, 340/5.3, 340/5.31, 340/5.8, 726/2
• US Class Current: 340/5.2
• 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

The invention relates to a portable handheld work apparatus such as a cutoff machine, motor-driven chain saw, brushcutter, blower apparatus or the like. The apparatus includes a drive motor (2) for driving a work tool (6) and is provided with a security circuit (20). The security circuit (20) switches the drive motor (2) of the work apparatus into an operational-ready state or into an out-of-service state in dependence upon received signals of a receiver unit (18). The receiver unit is configured to receive at least one operating code. The receiver unit (18) is configured for receiving a service code (27) and, with the receipt of a service code, switches the drive motor into only a temporary service state.

Claims

1. A portable handheld work apparatus comprising:

a work tool;

a drive motor for driving said work tool;

a security circuit for switching said drive motor into an operational-ready state for an operation or into an out-of-service state;

a receiver unit configured to receive a service code including a permissible service code and to output a signal;

said security circuit being configured to switch said drive motor into a temporary service state in response to said signal from said receiver unit when said service code received by said receiver unit is said permissible service code;

said security circuit including a counter arranged in said work apparatus for incrementing in response to each receipt of said permissible service code; and

,

after reading a pregiven counter count, said security circuit being configured to switch said drive motor into a permanent out-of-service state which can be revoked by receipt of a permitted operating code.

2. The portable handheld work apparatus of claim 1, wherein said pregiven counter count is less than 5.

3. The portable handheld work apparatus of claim 1, wherein said pregiven counter count is less than 3.

4. The portable handheld work apparatus of claim 1, wherein said receiver unit decrements said counter with each receipt of a permissible operating code.

5. The portable handheld work apparatus of claim 1, wherein at least one permissible service code and at least one permissible operating code are stored in said security circuit.

6. The portable handheld work apparatus of claim 1, wherein said temporary service state and the operational-readiness state are the same.

7. The portable handheld work apparatus of claim 1, wherein said drive motor is driven with at least one of a significantly reduced rotational speed and significantly reduced power in said out-of-service state.

8. The portable handheld work apparatus of claim 1, wherein said drive motor is switched off in said out-of-service state.

9. The portable handheld work apparatus of claim 1, wherein at least one of the full rotational speed and the full power of said drive motor can be called up in said operational-readiness state and in said temporary service state.

10. The portable handheld work apparatus of claim 1, wherein said drive motor is a combustion engine.

11. The portable handheld work apparatus of claim 1, wherein said work apparatus is a cutoff machine, a motor-driven chain saw, a brushcutter, or a blower apparatus.