Electric power tool

• US 20050161305A1
• Filed: 01/04/2005
• Published: 07/28/2005
• Est. Priority Date: 01/10/2004
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Frei, Remo, Bandli, Curdegn, Jenni, David
• Application Number:
  US11/028,905
• Publication Number:
  US 20050161305A1
• Time in Patent Office: Days
• US Class Current: 192/223
• CPC Class Codes: B23B 45/005 Flexible shafts
• CPC Class Codes: B25H 3/006 Storage means specially adapted for one specific hand apparatus, e.g. an electric drill

Abstract

An electric power tool (10) has at least one battery-powered electric motor, and the electric motor and the battery can be placed on the back of a user by means of a wearable unit (50). Via a flexible shaft (30), a driven tool (40) is driven by the electric motor. The wearable unit (50) has guide means (63 through 65), which engage the flexible shaft (30) in such a way that beginning at the back region of the user (52), this shaft is fixed in the shoulder region in such a way that it is secured against slipping off. This assures good guidance of the flexible shaft (30) and enables the user (52) to work ergonomically (FIG. 1).

Claims

1. An electric power tool, having at least one battery-powered electric motor (11), which can be placed on the back (51) of a user (52) by means of a wearable unit (50) and by means of which, via a flexible shaft (30), a driven tool (40), such as a screwdriver, hammer, grinder, power drill, saw or the like, can be driven, characterized in that the wearable unit (50) has guide means (63 through 65), which engage the flexible shaft (30) in such a way that beginning in the region of the back of the user (52), this shaft is fixed in the shoulder region in such a way that it is secure against slipping off.

2. The electric power tool of claim 1, characterized in that the guide means (63 through 65) engage the flexible shaft (30) in such a way that this shaft is directed over the back (51) and one of the two shoulders of the user (52) and from there toward the front in a straight line or approximately diagonally over the user'"'"'s chest.

3. The electric power tool of claim 1, characterized in that the wearable unit (50) has a hip belt (53) and on it, on the side toward the back (51) of the user (52), a holder (54), located above the hip of the user (52), for instance in the form of detachable loops (55, 56), belts, or the like that are fixable by means of adhesive closures, for interchangeably holding a drive unit (20), which contains the electric motor and at least one battery (21, 22) combined with it.

4. The electric power tool of claim 3, characterized in that the wearable unit (50) has two shoulder belts (57, 58), leading to the hip belt (53), which in the region (59) associated with the back (51) of the user (52) are united and joined to a back belt (60) leading to the hip belt (53).

5. The electric power tool of claim 1, characterized in that at least one of the shoulder belts (57, 58), or both, in the shoulder region has a guide (64, 65) extending along this region, in particular a tubular sleeve accommodating the flexible shaft (30).

6. The electric power tool of claim 1, characterized in that the back belt (60) has a guide (63) extending along it, in particular a loop or a tubular sleeve accommodating the flexible shaft (30).

7. The electric power tool of claim 1, characterized in that the guide means (63 through 65), in particular the guides, are detachably attachable to the wearable unit (50), for instance with adhesive closures or the like, or can be opened or closed, for instance by means of adhesive closures or the like.

8. The electric power tool of claim 3, characterized in that the hip belt (53), viewed in the vertical direction, is designed approximately conically in adaptation to the contour of the hip of a user.

9. The electric power tool of claim 3, characterized in that the hip belt (53), on at least one side, has an approximately pocketlike holster (62) for a driven tool (40).

10. The electric power tool of claim 4, characterized in that the two shoulder belts (57, 58), on the side associated with the chest of the user (52), are joined together by means of a transversely extending chest belt (61).

11. The electric power tool of claim 3, characterized in that the hip belt (53) and/or the shoulder belts (57, 58) and/or the back belt (60) and/or the chest belt (61) are padded and/or adjustable.