Cordless screwdriver

• US 7,498,526 B2
• Filed: 06/29/2005
• Issued: 03/03/2009
• Est. Priority Date: 08/09/2004
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Lohr, Guenter, Lim, Joseph Siang Choon, Kageler, Sven, Zulfikar, Abdul Aziz, Roehm, Heiko, Hirschburger, Wolfgang, Wan, Mohsein, Yeoh, Sim Teik
• Primary Examiner(s): Friedhofer; Michael A
• Assistant Examiner(s): HOMZA, LISA NHUNG
• Application Number:
  US11/573,389
• Publication Number:
  US 20070256914A1
• Time in Patent Office: 1,343 Days
• Field of Search: 200/520, 200/274, 200329-3322, 200/43.11, 200/43.17, 200/43.18, 200/334, 200/61.85, 200/1.V
• US Class Current: 200/5.00A
• CPC Class Codes: B25B 21/00 Portable power-driven screw or nut setting or loosening tools; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; for mounting or dismounting wheels B60B29/006; Attachments for drilling apparatus serving the same purpose machines B23P19/06
• CPC Class Codes: B25B 23/18 Devices for illuminating the head of the screw or the nut
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence
• CPC Class Codes: B25F 5/021 with guiding devices guiding devices for hand tools on stands or supports B25H1/0078

Abstract

A cordless screwdriver, having a housing (12, 18) with a pistol grip (14) with an ON/OFF button (26) and a rechargeable battery (40) inserted into it, in particular fixedly and with charging contact tongues (37) associated with the battery (40), is made safer and more convenient by providing that by means of the toggle switch (26), extending in elongated fashion over the inside of the pistol grip (14) and in particular pivotably supported, a plurality of power circuits of the cordless screwdriver (10) are interruptable and closable over the actuation stroke of the toggle switch successively independently of one another.

Claims

1. A cordless screwdriver, having a housing (12, 18) with a pistol grip (14) with a toggle switch (26) and a rechargeable battery (40) inserted into said housing fixedly and with charging contact tongues (37) associated with the rechargeable battery (40), wherein by means of the toggle switch (26), extending in elongated fashion over an interior of the pistol grip (14) and pivotably supported, a plurality of power circuits of the cordless screwdriver (10) are interruptable and closable over an actuation stroke of the toggle switch successively, simultaneously, independently of one another.

2. The cordless screwdriver as recited in claim 1, wherein the toggle switch (26) has various actuation positions, attainable in succession over its actuation stroke in separate actuation positions, associated with two electrical switches (32, 34).

3. The cordless screwdriver as recited in claim 2, wherein the electrical switches (32, 34), upon release of the toggle switch (26), interrupt the power circuits associated with them.

4. The cordless screwdriver as recited in claim 1, wherein one electrical switch (32) serves as a main switch for a plurality of power circuits of the cordless screwdriver (10) and when the toggle switch (26) is depressed undoes the interruption of the power circuits;

and wherein the other electrical switch (34) forms a second interruption of a motor power circuit, which is closed by further depression of the toggle switch (26).

5. The cordless screwdriver as recited in claim 1, wherein one switch (32) serves as an interrupter for a work light (80).

6. The cordless screwdriver as recited in claim 1, wherein the toggle switch (26) is braced in prestressed fashion on the housing by means of a spiral spring (28) counter to an actuation direction and is pivotably supported about a pivot shaft (30, 31).

7. The cordless screwdriver as recited in claim 1, wherein only a single, elongated, slender lithium-ion (Li-ion) cell is located as a rechargeable battery (40) in the pistol grip (14).

8. The cordless screwdriver as recited in claim 1, wherein for switchover from clockwise to counterclockwise operation, a sliding switch (38) is located on a circuit board (36) and is actuated via a slide button (39) that is longitudinally displaceable.

9. The cordless screwdriver as recited in claim 8, wherein when the toggle switch (26) is pressed, the sliding switch (38) is blocked;

and that the toggle switch (26) is blocked whenever the slide button (39) is in a middle position.

10. The cordless screwdriver as recited in claim 1, wherein one large-area rubber covering (11), protruding laterally in toroidal fashion, with a bumpy structure (110) is located on each half shell (16, 17) in a region of the pistol grip (14).