IP Library Granted Patent US 12667943
Granted Patent B2
US 12667943 · App. 19/184,891 · Granted Jun 30, 2026

Impact tool with a multi-piece anvil assembly

Inventor: Kyle A. Marten (Plymouth, WI)
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
B25B21/026
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12667943
App. No.
19/184,891
Granted
Jun 30, 2026
Kind
B2
Abstract

An assembly includes a plurality of drive members, each drive member of the plurality of drive members including a head portion having a plurality of drive surfaces and configured to be coupled to a tool element, and a splined shaft portion extending from the head portion. The head portion of each drive member of the plurality of drive members is a different nominal size than the head portion of each other drive member of the plurality of drive members.

Claims (52)

1 . A kit comprising:

an impact tool including:

a housing including a motor housing portion, a handle portion extending from the motor housing portion, and a front housing portion coupled to the motor housing portion,

a motor supported within the motor housing portion, and

a drive assembly supported within the front housing portion forward of the motor, the drive assembly configured to convert a constant rotational force provided by the motor into a striking rotational force, the drive assembly including an anvil member; and

an assembly comprising:

a plurality of drive members, each drive member of the plurality of drive members configured to be interchangeably coupled to the anvil member for co-rotation with the anvil member, each drive member of the plurality of drive members including

a head portion having a plurality of drive surfaces and configured to be coupled to a tool element,

a splined shaft portion extending rearwardly from the head portion, and

a retainer supported by the splined shaft portion and configured to be positioned rearward of a front end of the front housing portion when the drive member is coupled to the anvil member,

wherein the head portion of each drive member of the plurality of drive members is a different nominal size than the head portion of each other drive member of the plurality of drive members.

2 . The kit of claim 1 , wherein each drive member of the plurality of drive members is able to be locked into the anvil member.

3 . The kit of claim 2 , wherein the splined shaft portion of each drive member of the plurality of drive members is receivable within a splined bore of the anvil member.

4 . The kit of claim 1 , wherein the splined shaft portion of each drive member of the plurality of drive members is receivable within a splined bore of the anvil member.

5 . The kit of claim 1 , wherein the plurality of drive surfaces of the head portion form a square drive.

6 . The kit of claim 1 , wherein each drive member of the plurality of drive members includes a friction ring.

7 . The kit of claim 1 , wherein each drive member of the plurality of drive members includes a pin detent.

8 . The kit of claim 1 , wherein the head portion of each drive member of the plurality of drive members is configured to be coupled to a differently sized tool element.

9 . The kit of claim 1 , wherein the retainer includes a friction ring.

10 . The kit of claim 1 , wherein the drive assembly includes a camshaft with a rear end facing the motor and a front end opposite the rear end, and a hammer supported on and slidable relative to the camshaft along an axis, wherein the impact tool further comprises a gear assembly positioned between the motor and the anvil member along the axis, the gear assembly including a pinion, a plurality of planet gears meshed with the pinion, and a ring gear meshed with the plurality of planet gears, wherein the ring gear is fixed within the housing, and wherein the plurality of planet gears is mounted on the camshaft such that the camshaft defines a planet carrier of the gear assembly.

11 . An impact tool comprising:

a housing;

a motor supported within the housing;

a drive assembly supported within the housing and configured to convert a constant rotational force provided by the motor into a striking rotational force, the drive assembly including a hammer and an anvil assembly configured to rotate about an axis, the anvil assembly including an anvil member having

a body,

an anvil lug extending outwardly from the body, the anvil lug configured to be impacted by the hammer, and

a bore extending at least partially through the body; and

a drive member removably coupled to the anvil member, the drive member including a shaft portion configured to be received within the bore of the anvil member to couple the drive member for co-rotation with the anvil member, a retainer supported by the shaft portion, and a front portion configured for coupling to a tool element to transmit torque from the anvil member to the tool element,

wherein the retainer is engageable with the body of the anvil member at a position within the housing to axially retain the drive member relative to the anvil member.

12 . The impact tool of claim 11 , wherein the retainer is engageable with a recess formed in the anvil body.

13 . The impact tool of claim 11 , wherein the retainer is a first retainer, wherein the front portion of the drive member supports a second retainer, and wherein the second retainer includes a pin detent.

14 . A kit comprising:

an impact tool including

a housing,

a motor supported within the housing, and

a drive assembly supported within the housing and configured to convert a constant rotational force provided by the motor into a striking rotational force, the drive assembly including a hammer and an anvil assembly configured to rotate about an axis, the anvil assembly including an anvil member having

a body,

an anvil lug extending outwardly from the body, the anvil lug configured to be impacted by the hammer, and

a bore extending at least partially through the body; and

a plurality of drive members, each drive member of the plurality of drive members including

a head portion configured to be coupled to a tool element,

a shaft portion extending from the head portion, and

a retainer supported by the shaft portion,

wherein each drive member of the plurality of drive members is a different size,

wherein each drive member of the plurality of drive members is configured to be interchangeably inserted into the bore of the anvil member to couple the drive member to the anvil member for co-rotation with the anvil member about the axis, and

wherein the retainer is configured to be positioned within the housing when the shaft portion of the drive member is inserted into the bore of the anvil member.

15 . The kit of claim 14 , wherein the head portion of each drive member of the plurality of drive members defines a square drive interface.

16 . The kit of claim 15 , wherein the square drive interface defines a nominal size, wherein the plurality of drive members includes a first drive member, a second drive member, and a third drive member, wherein the nominal size of the first drive member is ⅜ inch, wherein the nominal size of the second drive member is ½ inch, and wherein the nominal size of the third drive member is ¾ inch.

17 . The kit of claim 14 , wherein the retainer is a first retainer, and wherein the head portion of each drive member of the plurality of drive members supports a second retainer.

18 . The kit of claim 14 , wherein the bore is a splined bore.

19 . The kit of claim 17 , wherein the second retainer of each drive member of the plurality of drive members includes a friction ring or a pin detent.

20 . The kit of claim 14 , wherein each drive member of the plurality of drive members has a different length.