Patent · US Expired

Hammer drill for performing rotary drilling or percussive drilling

US4434859A · kind A · utility

40Cited by

9References

9Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Gerhard Rumpp · Herrsching am Ammersee, DE
Dieter Scholz · Germering, DE
Manfred Spieth · Martinsried, DE

Key dates

Filing date	Jun 25, 1982
Grant date	Mar 6, 1984
Priority date	—
Expiry date	Jun 25, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T279/17752
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A hammer drill for performing percussive drilling or rotary drilling includes a housing and a tool holder mounted on and axially displaceable relative to the housing, the tool holder contains a retainer sleeve mounting locking member for securing the shank of a tool in the holder. When the hammer drill is used only for rotary drilling, the retainer sleeve is displaced into contacting engagement with the housing for centering the tool holder. The tool holder includes stops for securing the locking members against axial displacement during rotary drilling. One stop is movable relative to the retainer sleeve and can be locked in position. Another stop forms part of the retainer sleeve. The stops combine with the closed ends of the recesses in the tool shank for holding the locking members against axial displacement.

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