US 12,257,658 B2
Dust suction device
Daniel Goehring, Kreuzlingen (DE); and Juergen Dietel, Stuttgart (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/268,566
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Aug. 13, 2019, PCT No. PCT/EP2019/071681
§ 371(c)(1), (2) Date Feb. 15, 2021,
PCT Pub. No. WO2020/043478, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 10 2018 214 614.4 (DE), filed on Aug. 29, 2018.
Prior Publication US 2021/0252655 A1, Aug. 19, 2021
Int. Cl. B23Q 11/00 (2006.01); A47L 7/00 (2006.01); B25F 5/00 (2006.01)
CPC B23Q 11/0046 (2013.01) [A47L 7/0095 (2013.01); B23Q 11/0071 (2013.01); B25F 5/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A dust extraction device for a hand-held power tool, comprising:
a housing;
a fan unit accommodated in the housing and configured to generate an air volume flow;
at least one extraction opening configured to extract drilling debris by suction from a drill hole in a workpiece; and
at least one aspiration opening configured to generate a negative pressure in an adhesion region between the dust extraction device and the workpiece using the air volume flow,
wherein
the dust extraction device is configured to be electrically connected to a battery cell,
the dust extraction device has a battery interface,
the battery interface is designed to connect the dust extraction device to a hand-held power tool battery pack,
the extraction opening is connected to the adhesion region such that there is a negative pressure present both in the region of the extraction opening and in the adhesion region while the drilling debris is being extracted from the drill hole by the suction, and
the negative pressure in the region of the extraction opening differs from the negative pressure in the adhesion region.