Rotary power tool

Patent metadata

Field	Value
Publication number	US-12583069-B2
Application number	US-202418812505-A
Country	US
Kind code	B2
Filing date	Aug 22, 2024
Priority date	Jan 19, 2021
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A rotary hammer tool can include a housing, a first motor supported by the housing, a spindle rotated by the first motor, a second motor supported by the housing, and a reciprocation mechanism reciprocated by the second motor. The reciprocation mechanism can include a piston driven to reciprocate within the spindle and a striker to reciprocate within the spindle in response to reciprocation of the piston. The rotational speed of the spindle and a reciprocation frequency of the reciprocation mechanism may be independently controllable.

First claim

What is claimed is:

1 . A rotary hammer, comprising:
a housing; a first motor supported by the housing; a spindle rotated by the first motor; a second motor supported by the housing; a reciprocation mechanism reciprocated by the second motor, the reciprocation mechanism including:
a piston driven to reciprocate within the spindle; and
a striker to reciprocate within the spindle in response to reciprocation of the piston;
a single mode selection switch moveable between a first position, a second position, and a third position; and an actuation member to selectively control activation of the first motor and the second motor based on a selected position of the single mode selection switch, the actuation member activating only the first motor when the single mode selection switch is in the first position, the actuation member activating only the second motor when the single mode selection switch is in the second position, and the actuation member activating the first motor and the second motor when the single mode selection switch is in the third position, wherein a rotational speed of the spindle and a reciprocation frequency of reciprocation mechanism are independently controllable.

2 . The rotary hammer of claim 1 , wherein the first motor defines a first motor rotation axis and the second motor defines a second motor rotation axis that is parallel to the first motor rotation axis.

3 . The rotary hammer of claim 1 , wherein the first motor defines a first motor rotation axis and the second motor defines a second motor rotation axis that is perpendicular to the first motor rotation axis.

4 . The rotary hammer of claim 1 , wherein the spindle defines a first spindle rotation axis and the second motor defines a second motor rotation axis that is perpendicular to the first spindle rotation axis.

5 . The rotary hammer of claim 4 , wherein the first motor defines a first motor rotation axis that is perpendicular to the first spindle rotation axis.

6 . The rotary hammer of claim 4 , wherein the first motor defines a first motor rotation axis that is parallel to the first spindle rotation axis.

7 . The rotary hammer of claim 1 , wherein the first motor and the second motor are arranged in a radially opposed configuration about a rotational axis of the spindle.

8 . The rotary hammer of claim 1 , wherein the housing includes a handle having the actuation member and the second motor is positioned between the first motor and the handle.

9 . The rotary hammer of claim 1 , further comprising a controller that independently controls a speed of the first motor and the second motor.

10 . A rotary hammer, comprising:
a housing; a first transmission supported by the housing; a spindle rotated by the first transmission; a second transmission supported by the housing; a reciprocation mechanism reciprocated by the second transmission, the reciprocation mechanism including:
a piston driven to reciprocate within the spindle the second transmission; and
a striker to reciprocate within the spindle in response to reciprocation of the piston;
a single mode selection switch moveable between a first position, a second position, and a third position; and an actuation member moveable relative to the housing to control a rotational speed of the spindle and a reciprocation frequency of the reciprocation mechanism by selectively controlling activation of the first transmission and the second transmission based on a selected position of the single mode selection switch, the actuation member activating only the reciprocation mechanism when the single mode selection switch is in the first position, the actuation member activating only the spindle when the single mode selection switch is in the second position, and the actuation member activating the reciprocation mechanism and the spindle when the single mode selection switch is in the third position, the rotational speed and the reciprocation frequency being independently adjustable.

11 . The rotary hammer of claim 10 , wherein the first transmission and the second transmission are on radially opposite sides of a rotation axis of the spindle.

12 . The rotary hammer of claim 10 , further comprising a first motor coupled to the first transmission and a second motor coupled to the second transmission, a speed of each of the first motor and the second motor being independently controllable by the actuation member to adjust reciprocation of the reciprocation mechanism and rotation of the spindle.

13 . The rotary hammer of claim 12 , wherein the first motor defines a first motor rotation axis and the second motor defines a second motor rotation axis, at least one of the first motor rotation axis and the second motor rotation axis being perpendicular to a rotation axis of the spindle.

14 . The rotary hammer of claim 12 , wherein the first motor defines a first motor rotation axis and the second motor defines a second motor rotation axis, at least one of the first rotation axis and the second rotation axis being parallel to a rotation axis of the spindle.

15 . The rotary hammer of claim 12 , wherein the first motor defines a first motor rotation axis and the second motor defines a second motor rotation axis, the first rotation axis and the second rotation axis being coaxial.

16 . The rotary hammer of claim 10 , wherein the reciprocation mechanism includes a crankshaft that is coupled to the piston by a connecting rod.

17 . A method of operating a rotary hammer, the method comprising:
arranging a single mode selection switch in one of a first position, a second position, or a third position, the single mode selection switch secured to a housing of the rotary hammer; actuating an actuation member; and when the single mode selection switch in in the first position, controlling a first motor of the rotary hammer to rotate a spindle within the housing; when the single mode selection switch is in the second position, controlling a second motor of the rotary hammer to reciprocate a reciprocation mechanism within the housing; when the single mode selection switch is in the third position, controlling the first motor to rotate the spindle, and controlling the second motor to reciprocate the reciprocation mechanism.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Greunke Kyle
• Van Hoorn Andrew D
• Mclachlan Kevin A
• Marsh Julia C
• Builes Zapata Mauricio
• Richards Daryl S
• Cholst Beth E
• Spraggon Jeffery D

Classifications

• B25F5/003

  Stops for limiting depth in rotary hand tools (for drilling tools: B23B49/003) · CPC title

• B25D2217/0057

  Details related to cleaning or cooling the tool or workpiece · CPC title

• B25D2211/061

  Swash-plate actuated impulse-driving mechanisms · CPC title

• B28D7/02

  for removing or laying dust, e.g. by spraying liquids; for cooling work · CPC title

• B25F5/026

  in the form of an auxiliary handle (B25F5/024 takes precedence) · CPC title