Patent · US Active

Hydraulic pressure supply unit for a power screwdriver

US8667789B2 · kind B2 · utility

2Cited by

5References

6Claims

0Family size

Assignee

WAGNER VERMÖGENSVERWALTUNGS-GMBH & CO. KG · DE

Inventors

Bernd Thelen · Much, DE
Ulf Sittig · Bad Wurzach, DE
Günter Andres · Much, DE

Key dates

Filing date	Mar 11, 2009
Grant date	Mar 11, 2014
Priority date	—
Expiry date	Jul 6, 2031

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF15B2211/76
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The pressure supply unit has a pressure generating aggregate (10), which generates a supply pressure (PL) for the intermittent operation of a power screwdriver (11). So as to allow also a tensioning cylinder unit (33) to be operated alternatively to the power screwdriver (11), which requires higher pressure, a pressure intensifier (30) is provided which is included in a separate module (31) and generates high pressure (PH) from the supply pressure (PL). The reversal of the pressure intensifier (30) for carrying out strokes is achieved by the same stroke switch valve (20) which otherwise performs the reversal of the power screwdriver (11).

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