Handheld Work Apparatus
US-2020246957-A1 · Aug 6, 2020 · US
Power tool having a first gear stage and a belt drive
US12564929B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12564929-B2 |
| Application number | US-202117501766-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 14, 2021 |
| Priority date | Oct 14, 2021 |
| Publication date | Mar 3, 2026 |
| Grant date | Mar 3, 2026 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A power tool includes a motor, a rotary disk, a belt drive connecting the motor to the rotary disk, and a reduction gear stage between the motor and the belt drive. A power tool with a ratio of an outer diameter of the drive pulley and an outer diameter of the output pulley being 0.75 to 1.33 is also provided as is a method of operating a power tool.
First claim
Opening claim text (preview).
What is claimed is: 1 . A power tool comprising: a motor; a rotary disk; and a belt drive including a drive pulley driven by the motor, an output pulley connected to the rotary disk and a belt passing around the drive and output pulleys, a ratio of an outer diameter of the drive pulley and an outer diameter of the output pulley being 0.75 to 1.33. 2 . The power tool as recited in claim 1 further comprising: a reduction gear stage between the motor and the belt drive. 3 . The power tool as recited in claim 2 further comprising an intermediate shaft between the reduction gear stage and the belt drive and connecting the reduction gear stage to the belt drive. 4 . The power tool as recited in claim 2 wherein the motor has an output shaft and the reduction gear stage has a first gear and a second gear, the first gear being arranged on the output shaft of the motor and the second gear being arranged on the intermediate shaft. 5 . The power tool as recited in claim 2 wherein the drive and output pulleys have an outer diameter of 10 to 100 mm. 6 . The power tool as recited in claim 5 wherein the outer diameter is 25 to 50 mm. 7 . The power tool as recited in claim 2 wherein the belt is a V-ribbed belt. 8 . The power tool as recited in claim 7 wherein the V-ribbed belt has five to fifteen ribs. 9 . The powertool as recited in claim 2 the drive pulley is arranged on the intermediate shaft. 10 . The power tool as recited in claim 9 wherein the motor has an output shaft and the reduction gear stage has a first gear and a second gear, the first gear being arranged on the output shaft of the motor and the second gear being arranged on the intermediate shaft. 11 . The power tool as recited in claim 2 wherein the motor is rated to have an operational rotational speed in a range from 10 000 rpm to 30 000 rpm. 12 . The power tool as recited in claim 2 wherein a speed reduction ratio of the reduction gear stage is between 2 and 4. 13 . The power tool as recited in claim 2 wherein a ratio between an outer diameter of the output pulley and an outer diameter of the rotary disk is in a range from 1/30 to 1/3. 14 . The power tool as recited in claim 2 wherein a ratio between a rated operational rotational speed of the motor and a maximum rotational speed of the rotary disk is in a range from 1.97 to 5.91. 15 . The power tool as recited in claim 2 wherein the rotary disk is a grinding wheel or saw. 16 . The power tool as recited in claim 2 further comprising a handle, the power tool being a handheld power tool. 17 . The power tool as recited in claim 2 wherein the motor is an electric motor and further comprising a rechargeable battery for driving the electric motor. 18 . A method for operating a power tool having a motor, a rotary disk, and a belt drive including a drive pulley driven by the motor, an output pulley connected to the rotary disk and a belt passing around the drive and output pulleys, a ratio of an outer diameter of the drive pulley and an outer diameter of the output pulley being 0.75 to 1.33, the method comprising: operating the motor at a speed between 10,000 rpm to 30,000 rpm; reducing the motor speed during the operating with a gear stage to drive the drive pulley at a speed less than 10,000 rpm; and driving the rotary disk with the output pulley at less than 10,000 rpm.
Assignees
Inventors
Classifications
- B25F5/001Primary
Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12564929B2 cover?
- A power tool includes a motor, a rotary disk, a belt drive connecting the motor to the rotary disk, and a reduction gear stage between the motor and the belt drive. A power tool with a ratio of an outer diameter of the drive pulley and an outer diameter of the output pulley being 0.75 to 1.33 is also provided as is a method of operating a power tool.
- Who is the assignee on this patent?
- Hilti Ag
- What technology area does this patent fall under?
- Primary CPC classification B25F5/001. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).