Patent · US Active

Control method for a hammer drill

US10414036B2 · kind B2 · utility

2Cited by

10References

3Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Roland Schaer · Grabs, CH
Antonios Draganis · Bad Wörishofen, DE
Peter Hricko · Buchs, CH
Franz Moessnang · Landsberg, DE
Erwin Manschitz · Germering, DE

Key dates

Filing date	Nov 17, 2015
Grant date	Sep 17, 2019
Priority date	—
Expiry date	Sep 7, 2036

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D2250/221
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The control method for a hammer drill (1) provides the following steps. During basic operation, the motor (5) rotates at an operating speed for the drilling operation with chiseling action in order to rotationally drive the tool holder (2) and to drive the hammer mechanism (6) with a nominal striking power. The torque coupling (21) is monitored with the aid of a sensor (26). If a disengagement of the torque coupling (21) occurs, the striking power of the hammer mechanism (6) is reduced to below 10% of the nominal striking power during a disengagement of the torque coupling (21), and the torque coupling (21) is driven. When the disengagement of the torque coupling (21) ends, the striking power of the hammer mechanism (6) is increased to the nominal striking power and the torque coupling (21) is driven at the operating speed for the drilling operation with chiseling action.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.