Metal working – Method of mechanical manufacture – With testing or indicating
Utility Patent
1995-12-15
2001-01-02
Bryant, David P. (Department: 3726)
Metal working
Method of mechanical manufacture
With testing or indicating
C173S181000
Utility Patent
active
06167606
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on an impact screwdriver, and on a method for tightening a screw connection by means of the impact screwdriver. Impact screwdrivers are already known which, in contrast to conventional screwdrivers, exert a tightening moment in the form of impulses on the screw connection, which has the advantage that relatively high tightening and releasing torques for screw connections can be applied with relatively little drive power and with a small holding moment having to be applied. It is disadvantageous in the case of such impact screwdrivers that the achievable tightening torque of the screw connection is subject to relatively severe fluctuations as a function of the particular screwdriving action (hard/soft) and as a function of friction influences. Relatively wide tolerances therefore have to be defined for screw connections which have to be tightened using impact screwdrivers. If there is any doubt, a screw connection must be designed more stringently by the designer than would be necessary in the event of a torque which can be maintained exactly.
DE 42 43 069 A1 discloses an impact torque in the case of which the impulses or rotation angle of the screwdriver are counted, in addition to detecting the torque, in order to turn the impact tool off, the impulses counted or the rotation angle determined up to completion of the screwdriving process additionally being intended to be used for determining the quality of the screw connection. Even when incorrectly tightened screw connections can be identified in this way, then neither is the tolerance band reduced nor is the creation of faulty screw connections reduced in the case of this impact tool. However, in present-day manufacture, the avoidance of faults is gaining a far greater importance because of the high fault rectification costs.
SUMMARY OF THE INVENTION
The impact screwdriver according to the invention, and the method according to the invention in contrast have the advantage that greater accuracy can be achieved in terms of the achievable tightening torque of the screw connection, as a result of which tighter tolerances can be maintained for the screw connection. Furthermore, the creation of incorrectly tightened screw connections is largely avoided.
REFERENCES:
patent: 3969810 (1976-07-01), Pagano
patent: 5131130 (1992-07-01), Eshghy
patent: 5181575 (1993-01-01), Maruyama et al.
patent: 5216795 (1993-06-01), Hansson
patent: 5439063 (1995-08-01), Anders et al.
patent: 5457866 (1995-10-01), Noda
patent: 5492185 (1996-02-01), Schoeps et al.
patent: 0 460 920 A1 (1991-06-01), None
patent: WO 92/03665 (1992-03-01), None
Mueller Gerold
Veitinger Heinz
Wolf Peter
Bryant David P.
Robert & Bosch GmbH
Striker Michael J.
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