Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-10-22
1978-09-05
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
33174E, 33143L, 324 61R, 324 65R, 340679, G01R 2700
Patent
active
041123557
ABSTRACT:
The tapered fastener system is one of the more reliable fastener systems for assuring the longevity of connected members, especially like those found in aircraft, which are subjected to stresses on the order of 20,000 psi and up. However, in order to achieve such joint longevity, a high quality installation of the tapered fastener has been determined to be necessary. The three areas which are the most critical to such an installation are: hole finish, fastener-to-hole bearing contact, and interference fit of fastener in hole.
The apparatus herein proposed evaluates these three factors to determine if the necessary quality level has been attained in the fabrication of the fastener and in hole preparation prior to actual installation. To this end this apparatus includes a probe and receptacle, simulating the fastener and hole respectively in conjunction with a computer and display box to electronically and instantaneously determine hole condition and comparative fastener-to-hole bearing and interference. A quick, inexpensive and accurate method of inspection for the factors noted is thus provided and consequently the cost of a quality tapered fastener installation is reduced to that of most straight shank fastener systems.
REFERENCES:
patent: 1860827 (1932-05-01), Turnbull
patent: 2417062 (1947-03-01), Coake
patent: 2688871 (1954-09-01), Lubinski
patent: 2742707 (1956-04-01), Jacobsen et al.
patent: 2772411 (1956-11-01), Cooper
patent: 3189268 (1965-06-01), Nilsson
patent: 3413542 (1968-11-01), Mayer
patent: 3426272 (1969-02-01), Griffin
patent: 3857093 (1974-12-01), Green
Gibson, Jr. Harry S.
Trevillion Charlie Gene
Krawczewicz Stanley T.
Lockheed Corporation
Sullivan John J.
LandOfFree
Quality and fit measuring apparatus for fasteners and their hole does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Quality and fit measuring apparatus for fasteners and their hole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quality and fit measuring apparatus for fasteners and their hole will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2098849