Patent · US Active

Pneumatic hammer mechanism and control method

US9132541B2 · kind B2 · utility

16Cited by

4References

12Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Alexander John · Berlin, DE
Reinhard Schulz · Hannover, DE
Eduard Pfeiffer · Halblech, DE

Key dates

Filing date	Jan 29, 2010
Grant date	Sep 15, 2015
Priority date	—
Expiry date	Feb 25, 2030

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D2250/245
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; an exciting piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; a drive for periodically moving the exciting piston with a stroke along the impact axis, wherein the flying mass is excited to a periodic movement between the impact surface and exciting piston. The stroke is selected as a function of a maximum length of the pneumatic chamber such that the periodic movement of the flying mass on the path between an impact on the impact surface and a minimum approach of the exciting piston intermittently has a velocity of zero.

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