Pressure-operated power screwdriver having a measuring section

Details Pressure-operated power screwdriver having a measuring section Pressure-operated power screwdriver having a measuring section

2006-04-04

2006-04-04

Hail, III, Joseph J. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S478000, C081S479000, C081S481000, C081S429000, C081S057390

Reexamination Certificate

active

07021179

ABSTRACT:
The power screwdriver comprises a functional part (11) with a housing (14) through which a shaft (17) passes. The shaft (17) is provided with a toothing (18), into which a ratchet lever of the functional part (11) engages. A splined shaft toothing (20) of the shaft (17) has an insertion recess (21) that changes into a cavity (22). The wall of the cavity (22) is provided with a torsion sensor (23) and forms a measuring section (25) that is located in the area of the shaft (17) covered by the housing (14). A torsion measurement is effected in the measuring section (25). Due to the measuring section (25) being located in the area of the shaft covered by the housing (14), the shaft (17) is relatively short whereby it may be used under tight spatial screwing conditions involving a low head height above the screw. The power wrench is additionally provided with an angle measuring device (33) whereby torque and angle of rotation can be simultaneously provided and can be used for controlling and recording.

REFERENCES:
patent: 4608872 (1986-09-01), Mayer et al.
patent: 4794826 (1989-01-01), Franks
patent: 4796492 (1989-01-01), Liou
patent: 5457866 (1995-10-01), Noda
patent: 5609077 (1997-03-01), Ohmi et al.
patent: WO 9739857 (1997-10-01), None

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