System having an add-on handle and a hand-held power tool

Abstract

A system includes: an add-on handle; and a hand-held power tool which includes a clutch setting ring, a chuck with clamping jaws and a handle fastening arrangement which is situated axially between a section of the chuck and the clutch setting ring. In at least one operating state the add-on handle fastened to the handle fastening arrangement and the clamping jaws of the chuck are situated in at least one plane which is oriented perpendicularly to a rotation axis of the chuck.

Claims

1. A power tool system, comprising: an add-on handle; and a hand-held power tool which includes a clutch setting ring, a chuck with clamping jaws, and a handle fastening arrangement situated axially between a section of the chuck and the clutch setting ring; wherein in at least one operating state (i) the add-on handle is fastened to the handle fastening arrangement, and (ii) the clamping jaws of the chuck and the add-on handle fastened to the handle fastening arrangement are situated in at least one plane which is oriented perpendicularly to a rotation axis of the chuck, wherein the at least one plane intersects the add-on handle and the clamping jaws in the at least one operating state, wherein the hand-held power tool includes a gear unit housing to which the handle fastening arrangement is secured, wherein the hand-held power tool includes a bearing device on which a tool spindle is rotatably mounted in the gear unit housing, wherein the handle fastening arrangement indirectly fastens the bearing device axially.

2. The system as recited in claim 1, wherein the add-on handle fastened to the handle fastening arrangement encloses the clamping jaws of the chuck.

3. The system as recited in claim 2, wherein the clamping jaws of the chuck and the add-on handle fastened to the handle fastening arrangement are situated in the at least one plane which is oriented perpendicularly to a rotation axis of the chuck, at least when the clamping jaws are fully opened.

4. The system as recited in claim 2, wherein the handle fastening arrangement includes an annular clamping section.

5. The system as recited in claim 4, wherein the handle fastening arrangement has a diameter between 35 mm and 50 mm.

6. The system as recited in claim 4, wherein the handle fastening arrangement is made of more than 75% of an electrically conductive material.

7. The system as recited in claim 4, wherein the hand-held power tool includes an insulation unit which secures the handle fastening arrangement such that the handle fastening arrangement is electrically insulated from a tool spindle of the hand-held power tool.

8. The system as recited in claim 1, wherein the handle fastening arrangement is secured to the gear unit housing by screws.

9. The system as recited in claim 1, wherein the gear unit housing and the insulation unit are at least partially embodied in one piece.

10. The system as recited in claim 1, wherein the clutch setting ring is rotatably mounted on the gear unit housing and encloses a part of a gear unit disposed in the gear unit housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a system having an add-on handle and a hand-held power tool.

(2) FIG. 2 shows a partial section of the hand-held power tool and the add-on handle from FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

(3) FIG. 1 shows a system 10 having an add-on handle 38 and a hand-held power tool 32. Hand-held power tool 32 includes a chuck 14, a handle fastening means 16, a clutch setting ring 30, a hand tool housing 34, a hand tool rechargeable battery 36, add-on handle 38, a gear unit 44 and a drive unit 46. Hand tool rechargeable battery 36 supplies drive unit 46 with electrical energy during operation. Hand tool rechargeable battery 36 is connected by an operator to hand tool housing 34 for releasable detachment therefrom without tools. Hand tool housing 34 is designed in the shape of a pistol. It includes a main handle 40 and a drive housing section 42. Drive housing section 42 has ventilation slots. A gripping section of add-on handle 38 is formed from an electrically insulating plastic. Add-on handle 38 is oriented essentially perpendicularly to an axial direction of chuck 14.

(4) As shown in FIG. 2, hand-held power tool 32 includes a tool spindle 12, an insulation unit 18 and a bearing device 24. Drive housing section 42 encloses drive unit 46. During an operation, drive unit 46 rotationally drives tool spindle 12 with the aid of gear unit 44. Gear unit 44 is designed to provide at least two gear ratios and two different directions of rotation. Gear unit 44 includes a torque clutch not shown in further detail, which is provided to functionally separate tool spindle 12 from drive unit 46 when a torque, which is adjustable with the aid of clutch setting ring 30, is exceeded. The torque clutch has a drill setting in which tool spindle 12 and drive unit 46 are permanently connected. Tool spindle 12 and chuck 14 are detachably connected. In this embodiment, tool spindle 12 and chuck 14 are screwed together. Chuck 14 has three clamping jaws 28.

(5) Clutch setting ring 30 is situated axially between drive housing section 42 and handle fastening means 16. Clutch setting ring 30 is rotatably mounted about an axis which corresponds to a rotation axis 58 of chuck 14. Clutch setting ring 30 is rotatably mounted on a gear unit housing 22 of gear unit 44. Handle fastening means 16 secures clutch setting ring 30 in the axial direction in at least one operating state. Clutch setting ring 30 encloses a part of gear unit 44.

(6) Handle fastening means 16 is situated axially between a section of chuck 14 and clutch setting ring 30. Handle fastening means 16 includes an annular clamping section. Add-on handle 38 fastened to handle fastening means 16 and clamping jaws 28 of chuck 14 are, at least when clamping jaws 28 are fully opened, partially situated in at least one plane 56 oriented perpendicularly to rotation axis 58 of chuck 14. Handle fastening means 16 and add-on handle 38 enclose a section of chuck 14; specifically, handle fastening means 16 and add-on handle 38 partially enclose three clamping jaws 28 of chuck 14, at least when chuck 14 is fully opened. When chuck 14 is fully opened, it is able to accommodate insertion tools having a shaft diameter of at least 10 mm, advantageously 13 mm.

(7) A fastening surface 48 for fastening add-on handle 38 is designed as a cylinder barrel-shaped outer face of handle fastening means 16. In a fastened operating state, add-on handle 38 encloses handle fastening means 16. In this state, add-on handle 38 is frictionally engaged in the axial and tangential direction of handle fastening means 16. Alternatively, or in addition, add-on handle 38 and handle fastening means 16 could be connected in a form-locking manner. Add-on handle 38 may be fastened to handle fastening means 16 in different orientations about the axial direction. Handle fastening means 16 has a maximum diameter 20 of 43 mm perpendicular to the axial direction. Chuck 14 has at least a diameter perpendicular to the axial direction which is greater than a maximum inner diameter of handle fastening means 16. The diameter of chuck 14 perpendicular to the axial direction is smaller than the maximum diameter 20 of handle fastening means 16. Handle fastening means 16 is made of an electrically conductive material.

(8) Handle fastening means 16 is fastened to gear unit housing 22 of gear unit 44. Handle fastening means 16 and gear unit housing 22 are connected to each other by screws 50. Gear unit housing 22 and insulation unit 18 are formed as a single piece. Gear unit housing 22 is made of an electrically insulating material. Thus, insulation unit 18 secures handle fastening means 16 so that it is electrically insulated from tool spindle 12.

(9) Tool spindle 12 is rotatably mounted on bearing device 24 in gear unit housing 22. Bearing device 24 is designed as a ball bearing. Bearing device 24 is provided for the purpose of transmitting axial forces. Tool spindle 12 has an axial stop 52 which abuts bearing device 24 on a side of bearing device 24 facing chuck 14. Handle fastening means 16 secures bearing device 24 indirectly in the axial direction. Insulation unit 18 includes an insulant 26 which is situated between handle fastening means 16 and bearing device 24. Insulant 26 transmits a fastening force from handle fastening means 16 to bearing device 24 in at least one operating state. Hand-held power tool 32 includes a second bearing device not further described which supports tool spindle 12 on a side facing away from chuck 14.