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| Door operation control apparatus |
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| Alarm device with door/window cross-bar |
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| Remote-control system with a spread-spectrum transmission link |
| OF THE FIGURES FIG. 1 shows a spread-spectrum signal Sa and a shifted spread-spectrum signal Sb. T... |
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| High-speed video display system |
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Electric power tool with code receiver
| Details |
Inventors: Siegle, Volker; Hansson, Gunnar Christer;
Assignee: Atlas Copco Tools AB (Nacka, SE)
Primary Examiner: Zimmerman; Brian
Assistant Examiner: Wilson, Jr.; William H.
Attorney, Agent or Firm: Frishauf, Holtz, Goodman, Langer & Chick, P.C.
An electric power tool includes a power supply which is one of a replaceable battery unit, a rechargeable battery unit, and a cable connection for detachably connecting to a mains power supply. A code receiver is provided for receiving a code signal from a code signal emitting device via a contact free transmission. An electronic controller is arranged to switch the power tool to an operable mode when the power supply is coupled to the power tool and the code signal is received by the code signal receiver. The electronic controller is also arranged to switch the power tool to an inoperable mode when the power supply is uncoupled from the power tool and to maintain the power tool in the inoperable mode until the power supply is re-coupled to the power tool and the code signal is again received by the code signal receiver. |
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DETAILED DESCRIPTION According to the invention, the above object is achieved in that the power tool comprises a receiver and an electronic control means which is arranged to receive a code signal, wherein the electronic control means switches the tool on to an operable mode upon receiving the code signal, and wherein upon disconnection from the electrical supply voltage or after a certain time or operation interval, the tool returns to an inoperable mode and remains therein until the code signal is again received.
A code signal transmitter is permanently installed in the vicinity of the authorized workplace.
By virtue of this device, upon disconnection from the supply voltage, i.
e.
by removing the accumulator in a rechargeable battery powered tool or disconnecting the mains plug in a mains-operated tool, or after a certain time or operation interval, the tool is switched into the inoperable mode and remains therein.
If the tool is removed from the authorized workplace, in the case of a rechargeable battery powered tool, it can only be used until the charge runs out; in the case of a mains-operated tool, it can no longer be operated at all; in the case of time-interval or operation-interval switching, the tool can no longer be operated after such interval has expired.
This gives the owner great protection against theft, because relevant personnel will know that the tool is only usable at the workplace in connection with the code signal transmitter.
The tool according to the present invention will only be switched to the operable mode when the tool receives the code signal after reconnection of a battery unit in the case of a rechargeable tool, or reconnection to the mains or after expiry of the time or operation interval.
By means of different codings, groups of machines can be allocated to one of a number of working areas or code signal transmitters.
Thus, the respective tools can only be used in the allotted working area.
For example, in this manner it is possible to allocate screwdrivers having a specified torque setting to an assembly line (working area) at which such working operations only are to be carried out which require that particular torque setting
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