Measuring and testing – Ductility or brittleness
Patent
1974-09-19
1976-08-17
Myracle, Jerry W.
Measuring and testing
Ductility or brittleness
173 12, G01L 524
Patent
active
039746852
ABSTRACT:
A tightening system and method and a fastener assembly usable therewith are disclosed in this specification. According to the method a fastener assembly is provided that causes a change in the slope of the torque-rotation curve which could be plotted while the joint is being tightened, which change occurs at a known load. While tightening the joint, the torque applied to the fastener assembly when the slope of the torque-rotation curve changes is noted and is used to calculate the torque necessary to induce a desired load in the joint. Additional torque is applied to the fastener until the actual torque being applied substantially equals the calculated torque. The tightening system includes a wrench for tightening the joint and a control system associated with the wrench including a system responsive to the change in slope of the torque-rotation curve for calculating the torque corresponding to the desired load to be induced in the fastener assembly and for shutting off the tool when the actual torque corresponds to the calculated torque.
In accordance with the preferred embodiment disclosed herein, the fastener assembly includes a washer member which is seated between the bearing surface of the rotating fastener member and the outer surface of one of the structural members comprising the joint assembly. The washer member includes a bearing pad projecting above one of the main bearing surfaces of the washer member and located at the mean diameter thereof. As the fastener assembly is tightened, the bearing pad is deformed at a predetermined load temporarily changing the slope of the torque-rotation curve which is sensed by the tool as noted above.
REFERENCES:
patent: 2651196 (1953-09-01), Pinkel
patent: 3194105 (1965-07-01), Gill
patent: 3354705 (1967-11-01), Dyer, Jr.
patent: 3851386 (1974-12-01), Ellzey, Jr.
Myracle Jerry W.
Nerenberg Aaron
Ney Andrew L.
Seitter Robert P.
Standard Pressed Steel Co.
LandOfFree
Tightening system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tightening system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tightening system and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1480147