Title:
MEASURING APPARATUS FOR RESIDUAL STRESS OF SCREW
Document Type and Number:
Japanese Patent JPS57137830
Kind Code:
A
Abstract:
A socket (2) for prestressing a bolt (14) contains a probe (3) electrically connected to an ultrasonic unit (5) and a computer (6) for comparing the bolt length with that of a standard bolt. In order to avoid the use of cable connections and sliprings and to facilitate production-line prestressing of bolts, the probe (3) is electrically coupled to the ultrasonic unit (5) without contact via a device (7) concentrically surrounding the socket (2). The socket (2) is driven by a drive spindle (12). The device may comprise an annular rotor coil (9) connected to the socket (2) and a stator coil (10) spaced therefrom by bearings (11), pulses being transmitted inductively. Alternatively, the device comprises a spaced rotor electrode (9a) and a stator electrode (10a), pulses being transmitted capacitatively.
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Inventors:
DETOREFU HAINRIHI
BUARUTAA PURESUTERU
MANFUREETO BUAISU
BUARUTAA PURESUTERU
MANFUREETO BUAISU
Application Number:
JP234482A
Publication Date:
August 25, 1982
Filing Date:
January 12, 1982
Export Citation:
Assignee:
MASCHF AUGSBURG NUERNBERG AG
International Classes:
G01L5/24; G01L5/00; (IPC1-7): G01L5/00