US 2026/0307207 A1Published application

Inline Die Grinder

AssigneeBlack & Decker Inc.

InventorsJoseph Malcolm Palmer, Joseph Arthur Steele, Earnest N. Copeland, JR., Robert J. Cirincione, Sepehr Keshavarz Motamedi, Ross Keith Brown, Floyd Eugene Moreland,IV, Si Jiang Liu, Yan Hong Zhang, Ya Gao

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Abstract

A family of power tools provided, the power tools including a common back-end assembly comprising a tool housing, a motor disposed within the tool housing, a peripheral switch, and other features that are substantially the same on the common back-end assembly; and distinct front-end assemblies securely mounted to the back-end assembly. The family of power tools provide significantly high power-to-weight and power-to-volume ratios. In at least one tool, a ratio of a maximum power output produced by the spindle to an overall weight of the power tool is at least approximately 0.52 watts/g when the battery pack has a maximum voltage of 20 volts and an impedance in the range of approximately 67 to 75 mOhms.

Claims20

Dependent claims

A power tool comprising:

a tool housing having a first end and a second end positioned opposite the first end;
a motor at least partially received within the tool housing, the motor comprising a motor housing, a motor shaft, a stator assembly, a rotor assembly, and a motor fan, wherein the motor shaft, the stator assembly, the rotor assembly, and the motor fan are at least partially received within the motor housing, the motor housing having a first end and a second end positioned opposite the first end, the motor housing includes an exhaust opening proximate the motor fan;
a spindle housing having a first end and a second end positioned opposite the first end, wherein the first end of the spindle housing is securely mounted to the motor housing proximate the second end of the tool housing;
a spindle supporting within the spindle housing, the spindle having a first end and a second end positioned opposite the first end, the first end of the spindle in driving engagement with the motor shaft, and a second end of the spindle positioned outside of the spindle housing;
and
a shroud at least partially covering the spindle housing, wherein the shroud is distanced from the second end of the motor housing to form a circumferential gap therebetween in fluid communication with the exhaust opening.

3 more elements

A power tool comprising:

a tool housing having a first end and a second end positioned opposite the first end;
a motor at least partially received within the tool housing, the motor comprising a motor housing, a motor shaft, a stator assembly, a rotor assembly, and a motor fan, wherein the motor shaft, the stator assembly, the rotor assembly, and the motor fan are at least partially received within the motor housing, the motor housing having a first end and a second end positioned opposite the first end, the motor housing includes an exhaust opening proximate the motor fan;
a spindle housing having a first end and a second end positioned opposite the first end;
a spindle supporting within the spindle housing, the spindle having a first end and a second end positioned opposite the first end, the first end of the spindle in driving engagement with the motor shaft;
and
a shroud at least partially covering the spindle housing, wherein the shroud is distanced from the second end of the motor housing to form a circumferential gap therebetween in fluid communication with the exhaust opening,
wherein the spindle housing includes a threaded connection opening, wherein the threaded connection opening comprises a first set of openings on a first side of the spindle housing and a second set of openings on a second side of the spindle housing, wherein the shroud is connected to the spindle housing via a first set of screws engaged with the first set of openings and a second set of screws engaged with the second set of openings, with the first set of screws and the second set of screws extending through respective openings defined by the shroud,
wherein the shroud comprises a first half connected to the spindle housing via the first set of screws and a second half connected to the spindle housing via the second set of screws, wherein the first half of the shroud comprises a screw boss, and wherein a secondary screw extends through the second half of the shroud and engages the screw boss.

5 more elements

A power tool comprising:

a tool housing having a first end and a second end positioned opposite the first end;
a motor at least partially received within the tool housing, the motor comprising a motor housing, a motor shaft, a stator assembly, a rotor assembly, and a motor fan, wherein the motor shaft, the stator assembly, the rotor assembly, and the motor fan are at least partially received within the motor housing, the motor housing having a first end and a second end positioned opposite the first end, the motor housing includes an exhaust opening proximate the motor fan;
a spindle housing having a first end and a second end positioned opposite the first end;
a spindle supporting within the spindle housing, the spindle having a first end and a second end positioned opposite the first end, the first end of the spindle in driving engagement with the motor shaft;
and
a shroud at least partially covering the spindle housing, wherein the shroud is distanced from the second end of the motor housing to form a circumferential gap therebetween in fluid communication with the exhaust opening, wherein the spindle defines a tool cavity having a closed end and an open end, and wherein the closed end of the tool cavity is positioned intermediate the first and second ends of the spindle housing.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/711,062Filed 17 Jun 2026
Priority: 18 Dec 2023
Published: 8 Oct 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B24B 55/052
Specially designed for portable grinding machines: with rotating tools
B25F 5/02
Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for:…
B24B
Machines, devices, or processes for grinding or polishing
B25F
Combination or multi-purpose tools not otherwise provided for