Patent · US Active

Pneumatic hammer mechanism

US8616301B2 · kind B2 · utility

9Cited by

5References

7Claims

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	Dec 31, 2013
Priority date	—
Expiry date	Jun 2, 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; and a drive for periodically moving the exciting piston with a stroke along the impact axis. The flying mass is excited to a periodic movement between the impact surface and a minimum approach of the exciting piston. A length ratio of the maximum length of the pneumatic chamber to the stroke is selected as less than 1.55.

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