Title:
POWER TORQUE TOOL
Document Type and Number:
WIPO Patent Application WO2003000465
Kind Code:
A3
Abstract:
A power torque tool has an output shaft (18) along which torque pulses are transmitted to a load (28) such as a bolt. The shaft is driven by a mechanism (16) which can be of the impact-type or piston-and-cylinder type. The torque in the shaft (18) is measured by an integral region (30) of the shaft (18) which stores a remanent magnetisation which emanates a torque-dependent magnetic field. The field is sensed by non-contacting sensor arrangement 34. The torque impulses may be processed (36) to control the operation of the primary motor (14) so as to stop the motor when a predetermined torque is reached. The nature of the torque pulses generated in a power torque tool is analysed together with procedures for processing the pulses. The measurement of torque loss in torque pulse transmission along a shaft is disclosed.
Inventors:
MAY LUTZ AXEL (DE)
Application Number:
PCT/EP2002/006960
Publication Date:
December 18, 2003
Filing Date:
June 24, 2002
Export Citation:
Assignee:
FAST TECHNOLOGY AG (DE)
MAY LUTZ AXEL (DE)
MAY LUTZ AXEL (DE)
International Classes:
B25B21/02; B25B23/14; G01L3/10; (IPC1-7): B25B23/14; G01L5/24
Domestic Patent References:
WO2001044776A1 | 2001-06-21 | |||
WO1999021150A2 | 1999-04-29 | |||
WO2001047669A1 | 2001-07-05 |
Foreign References:
SE9904784A | ||||
FR2432918A1 | 1980-03-07 | |||
DE4222339A1 | 1994-01-13 | |||
DE3608521A1 | 1987-09-17 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 03 30 March 2000 (2000-03-30)
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