Electric power tool dust collection system

Patent metadata

Field	Value
Publication number	US-11298788-B2
Application number	US-201916416994-A
Country	US
Kind code	B2
Filing date	May 20, 2019
Priority date	Jun 19, 2018
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

An electric power tool dust collection system includes: a hammer drill, to which a dust suction bit is mounted; a dust collection device mounted to the hammer drill and including a suction portion (introduction port), a dust collection motor, a dust collection fan rotated by drive of the dust collection motor to generate a sucking force in the introduction port, and a dust collection portion (dust box) that stores powder dust suctioned from the introduction port; and exhaust flow paths (exhaust flow path and tubular flow path) respectively formed in the hammer drill and the dust collection device to lead exhaust that has passed through the dust box to a high-temperature portion (output portion) of the hammer drill.

First claim

What is claimed is:

1. An electric power tool dust collection system comprising:
a hammer drill (1) that includes a hammer drill motor and a hammer drill fan, (2) configured to receive and retain a bit and (3) that includes an output portion with a striking mechanism;
a dust collection device mounted to the hammer drill and including a suction portion, a dust collection motor, a dust collection fan rotated by drive of the dust collection motor to generate a sucking force in the suction portion, and a dust collection portion that stores powder dust suctioned from the suction portion; and
a first exhaust flow path in the hammer drill and a second exhaust flow path in the dust collection device configured to lead exhaust air that has passed through the dust collection portion to the output portion in an interior of the hammer drill to cool the output portion;
wherein:
the dust collection motor is a separate motor from the hammer drill motor and the dust collection fan is a separate fan from the hammer drill fan;
the output portion is tubular and extends along a longitudinal axis of the bit when the bit is retained by the hammer drill; and
the output portion and the first exhaust flow path are configured such that the exhaust air directly contacts the output portion in the first exhaust flow path.

2. The electric power tool dust collection system according to claim 1 , wherein
the exhaust flow paths communicate with each other when the dust collection device is mounted to the hammer drill.

3. The electric power tool dust collection system according to claim 1 , wherein
the first exhaust flow path is also used as a flow path for cooling air generated by rotation of the hammer drill fan.

4. The electric power tool dust collection system according to claim 1 , wherein
the hammer drill includes a motor housing portion that houses the hammer drill motor with an output shaft directed upward, and the dust collection device is mounted in front of the motor housing portion.

5. The electric power tool dust collection system according to claim 4 , wherein
the dust collection device is mounted under the motor housing portion.

6. The electric power tool dust collection system according to claim 1 , wherein
the hammer drill includes a housing that is divided into a housing on an anti-vibration side and a housing on a non-anti-vibration side via an anti-vibration portion, and the first exhaust flow path in the hammer drill is formed in a space between the housing on the anti-vibration side and the housing on the non-anti-vibration side.

7. The electric power tool dust collection system according to claim 6 , wherein
the dust collection device is mounted to the housing on the anti-vibration side.

8. The electric power tool dust collection system according to claim 1 , wherein
the first exhaust flow path is tubular with an axis parallel to an axis of the bit when the bit is retained by the hammer drill.

9. The electric power tool dust collection system according to claim 8 , wherein
the first exhaust flow path is formed between an inner housing, which holds a tool holder into which the bit is inserted, and an outside housing, which covers an outside of the inner housing.

10. The electric power tool dust collection system according to claim 9 , wherein
the dust collection device is slid upward from a lower side of the hammer drill to be mounted.

11. The electric power tool dust collection system according to claim 10 , wherein:
the second exhaust flow path is formed to project upward from a casing of the dust collection device; and
an exhaust introduction port, which communicates with the first exhaust flow path and into which the second exhaust flow path is inserted when the dust collection device is mounted, is formed in a lower surface of the outside housing.

12. The electric power tool dust collection system according to claim 1 , wherein
the dust collection portion is a dust box removably mounted to the dust collection device.

13. The electric power tool dust collection system according to claim 1 , wherein the exhaust air passes circumferentially around the output portion.

14. The electric power tool dust collection system according to claim 9 , wherein the exhaust air directly contacts the inner housing.

Assignees

• Makita Corp

Inventors

• Furusawa Masanori

Classifications

• B23Q11/0071

  dust collectors for hand tools · CPC title

• B23B47/34

  Arrangements for removing chips out of the holes made; Chip- breaking arrangements attached to the tool {(chip-breaking in turning machines B23B25/02; in turning tools B23B27/22)} · CPC title

• B25D2211/068

  Crank-actuated impulse-driving mechanisms · CPC title

• B23Q11/127

  for cooling motors or spindles · CPC title

• B23B2251/68

  Drills with provision for suction · CPC title