Impact tool

Patent metadata

Field	Value
Publication number	US-12064853-B2
Application number	US-202117517712-A
Country	US
Kind code	B2
Filing date	Nov 3, 2021
Priority date	Mar 7, 2017
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An impact tool (1; 1A) includes a spindle (12) rotated by a motor (10) and a hammer (70) rotated by the spindle. The hammer is designed to impact an anvil (14) in a rotational direction. A case (8) houses the hammer. A bearing (78A, 78B) is disposed between the hammer case and the anvil. An O-ring (84) is disposed between the anvil and the bearing.

First claim

The invention claimed is:

1. An impact tool comprising:
a motor;
a spindle configured to be rotated by the motor;
a hammer case;
a hammer disposed in the hammer case and configured to be rotated by the spindle;
an anvil configured to be impacted by the hammer;
a bearing disposed between the hammer case and the anvil; and
an O-ring is disposed between the anvil and the bearing.

2. The impact tool according to claim 1 , wherein:
the hammer case includes a front tube part, and
the O-ring is disposed radially inward of the front tube part.

3. The impact tool according to claim 1 , further comprising:
a bumper fixedly mounted on an outer circumference of a front tube part of the hammer case.

4. The impact tool according to claim 1 , further comprising:
an LED disposed on a radially outer side of a front tube part of the hammer case.

5. The impact tool according to claim 1 , wherein a front tube part of the hammer case includes a projection that extends radially inward from an inner diameter surface of the front tube part.

6. The impact tool according to claim 1 , further comprising:
a washer disposed between the anvil and a front tube part of the hammer case.

7. The impact tool according to claim 6 , wherein:
the front tube part includes a ring-shaped projection that extends radially inward from an inner diameter surface of the front tube part,
a first radially extending surface of the washer contacts the ring-shaped projection, and
a second radially-extending surface of the washer contacts the bearing.

8. The impact tool according to claim 1 , wherein the bearing axially and rotatably supports the anvil relative to the hammer case.

9. The impact tool according to claim 8 , wherein the bearing is a ball bearing.

10. The impact tool according to claim 8 , wherein:
the hammer case includes a front tube part, and
the O-ring is disposed radially inward of the front tube part.

11. The impact tool according to claim 10 , wherein the front tube part includes a projection that extends radially inward from an inner diameter surface of the front tube part.

12. The impact tool according to claim 11 , further comprising:
a washer disposed between the front tube part and the anvil.

13. The impact tool according to claim 12 , wherein:
the projection is a ring-shaped projection,
a first radially extending surface of the washer contacts the ring-shaped projection, and
a second radially-extending surface of the washer contacts the bearing.

14. The impact tool according to claim 13 , further comprising:
a bumper fixedly mounted on an outer circumference of the front tube part.

15. The impact tool according to claim 14 , further comprising:
an LED disposed on a radially outer side of the front tube part.

16. The impact tool according to claim 15 , wherein the bearing is a ball bearing.

17. The impact tool according to claim 1 , wherein the O-ring is disposed between the anvil and the bearing in a radial direction of the anvil.

18. The impact tool according to claim 1 , wherein the O-ring provides a seal between the anvil and the bearing.

19. The impact tool according to claim 1 , wherein:
the bearing has an inner ring and an outer ring,
the inner ring contacts and rotates together with the anvil,
the outer ring is fixed to the hammer case such that the inner ring is rotatable relative to the outer ring, and
the O-ring directly contacts the anvil and the inner ring.

20. The impact tool according to claim 1 , wherein:
the anvil has a circumferentially-extending groove, and
the O-ring is disposed in the circumferentially-extending groove.

21. The impact tool according to claim 20 , wherein:
the O-ring is disposed between the anvil and the bearing in a radial direction of the anvil, and
the O-ring provides a seal between the anvil and the bearing,
the hammer case includes a front tube part, and
the O-ring is disposed radially inward of the front tube part.

22. The impact tool according to claim 21 , wherein:
the bearing has an inner ring and an outer ring,
the inner ring contacts and rotates together with the anvil,
the outer ring is fixed to the hammer case such that the inner ring is rotatable relative to the outer ring, and
the O-ring directly contacts the anvil and the inner ring.

23. The impact tool according to claim 22 , wherein the bearing is a ball bearing or needle bearing.

24. The impact tool according to claim 1 , wherein the bearing is a ball bearing or needle bearing.

25. An impact tool comprising:
a motor;
a spindle configured to be rotated by the motor;
a hammer case;
a hammer disposed in the hammer case and configured to be rotated by the spindle;
an anvil having arms configured to be impacted by the hammer and an anvil shaft extending forward from the arms,
an O-ring circumferentially surrounding the anvil shaft, the O-ring being a separate member from the anvil, and
a bearing disposed radially inward of the hammer case, the bearing circumferentially surrounding the O-ring and rotatably supporting the anvil shaft.

26. The impact tool according to claim 25 , wherein:
the anvil shaft has a circumferentially-extending groove, and
the O-ring is disposed in the circumferentially-extending groove.

Assignees

• Makita Corp

Inventors

• Kumagai Ryunosuke
• Hirabayashi Tokuo
• Kondo Tomoyuki

Classifications

• B25B19/00

  Impact wrenches or screwdrivers (portable power-driven B25B21/02) · CPC title

• B25B23/0035

  Connection means between socket or screwdriver bit and tool · CPC title

• B25B21/02 Primary

  with means for imparting impact to screwdriver blade or nut socket · CPC title