Patent · US Expired

Rotary hammer

US6237699A · kind A · utility

19Cited by

8References

7Claims

0Family size

Assignee

BLACK & DECKER INC. · US

Inventors

Reinhard Plietsch · Brechen, DE
Robert Wache · Wiesbaden, DE
Bruno Ruethers · Bad Camberg, DE

Key dates

Filing date	Feb 9, 2000
Grant date	May 29, 2001
Priority date	—
Expiry date	Feb 9, 2020

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25D2250/365
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A rotary hammer is provided which comprises a tool holder (2) and an air cushion hammering mechanism which comprises a cylinder (8') having one end (8) that is connected to the tool holder, a piston (9), a ram (10) and a beat piece (21) slidably located in the cylinder so that reciprocation of the piston in the cylinder will cause the ram to reciprocate in the cylinder and thus cause the beat piece to hit a bit located in the tool holder. The ram (10) has an annular recess (31) in its peripheral surface at the end thereof nearest the piston (9), in which recess is located an annular seal (30). The annular seal has an annular seating flap (36) lying on the radially outwardly directed surface of the recess and an annular sealing flap (38) that is joined to the seating flap and extends between the radially outwardly directed surface of the recess and the inner wall of the cylinder (8').

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