---
publication_id: "OT-2026-000001811"
title: "Impact power tool"
published_at: "2026-09-15T19:08:48.879552Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000001811"
categories:
  - "tools-tooling/clamping-tools"
keywords:
  - "b25b21/02"
  - "b25f5/001"
  - "b25f5/001"
  - "b25b21/02"
  - "b25b21/02"
  - "b25b21/02"
---

# Impact power tool

## Abstract

An impact power tool includes one or more of the following features including a housing, a motor, an output spindle, a rotary impact assembly, and a planetary transmission having a fixed ring gear and rotatable planet gear carrier. In an aspect, the planetary transmission is configured to transmit rotational motion from a motor output shaft to a cam shaft at a single overall speed reduction ratio. The planetary transmission includes a sun gear rotatably driven by the motor output shaft, a planet carrier rotatably driving the cam shaft, a ring gear rotationally fixed relative to the tool housing, a first planet gear mounted to the planet carrier and meshed with the sun gear but not meshed with the ring gear and a second planet gear mounted to the carrier and meshed with the ring gear but not meshed with the sun gear.