Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1977-06-29
1979-03-06
Hafer, Robert A.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
73139, G01N 322, B25B 2314
Patent
active
041425910
ABSTRACT:
An apparatus for applying torque between one or more pairs of threaded members to effect a desired set condition. The set condition is determined by a control which terminates the application of torque when a preselected yielded tensioning of the threaded members is determined. The control is responsive to signals received from a torquemeter and an angle sensing device for determining seriatim the incremental increase in torque provided by the torque apparatus corresponding to a preselected incremental angle of rotational change. The control discontinues application of torque between the threaded members as an incident of a preselected decrease in the determined incremental torque increase. The threaded members may be first seated as by use of a low torque, high speed threading operation. The setting of the seated members may then be effected by a high torque, low speed threading operation. A plurality of pairs of threaded members may be concurrently set by the apparatus. The high torque, low speed threading operation may be controlled so as to permit application thereof only after all of the plurality of pairs of threaded members are seated by the low torque, high speed threading apparatus. The control utilizes a peak memory for retaining the highest value of torque applied between the threaded members and compares the sensed torque seriatim with the peak torque value of the peak memory in effecting the desired control of the threading operation.
REFERENCES:
patent: 3827506 (1974-08-01), Himmelstein et al.
patent: 3965778 (1976-06-01), Aspers et al.
patent: 4008772 (1977-02-01), Boys
patent: 4023406 (1977-05-01), Benz
patent: 4027530 (1977-06-01), Tambini et al.
Hafer Robert A.
S. Himmelstein and Company
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