Patent · US Active

Pneumatic hammer mechanism

US8955615B2 · kind B2 · utility

9Cited by

4References

6Claims

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	Feb 17, 2015
Priority date	—
Expiry date	May 7, 2030

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D2250/065
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A pneumatic hammer mechanism is disclosed. The hammer mechanism includes: a flying mass; 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 opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; and a drive for periodically moving the exciting piston with a stroke along the impact axis. The following inequality applies for the mass (m2) of the flying mass, a cross-sectional area (A) of the pneumatic chamber, the maximum length (L) of the pneumatic chamber, the stroke (H) of the exciting piston and an impact coefficient (q), if the hammer mechanism has an impact frequency (f) during percussive operation:

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