Abstract: The present invention relates to fasteners such as screwbolts in general and to anti-shake screwthreaded systems and anti-shake screwthreaded assemblies employing screwbolts in particular. As is universally known, in relation to screws and threaded fasteners, a thread comprise a continuous helical ridge formed on the inside (nut) or outside (screw) of a cylinder. An issue of concern for all types of screw fasteners is that if they rotate relative to a fastened item, they diminish the degree of fastening. Many methods of preventing a relative rotation between bolt and nut have been devised. The present invention seeks to provide an improved screwbolt system for use in engineering and construction. The present invention also seeks to provide a screwbolt for use as a fastener in harsh conditions of load and have a reduced tendency to unfasten. The present invention also seeks to provide a method of installing such screwbolts.

Abstract: The invention relates to a process for manufacturing a fixing device and a fixing device made by such a process. In particular, albeit not exclusively, the present invention relates a fixing device for application in fixing to concrete and like materials/substrates. The present invention therefore seeks to provide a fixing device for fixing to concrete, other like substrates which overcomes, or at least reduces some of the known problems of the prior art. The present invention also seeks to provide a fixing device which has enhanced corrosion resistance.

Abstract: A plurality of capacitors is subjected to a test cycle of charging, soaking and discharging. While in the soaking cycle, a plurality of measurements of current is obtained. The data is used to train a predictive function. Then, a test capacitor is charged and soaked for a shorter period than the plurality of capacitors. The current through the test capacitor is measured more than once during its soak period, and the measured current values are applied to the predictive function to predict whether the current through the test capacitor at the end of the soak time period would be higher than a predetermined value, thus indicating failure of a leakage test by test capacitor.

Abstract: The present invention relates to a fixing device for fixing to timber, plastics materials and friable substrates, the fixing device comprising a shank (1) having a first end and a second end, the shank comprising helically extending first (4), second and third parallel threads, wherein the first, second and third parallel threads are upstanding from the shank and are in spaced part arrangement to each other and the height of each thread above the shank is equal to the other.

Abstract: A method for testing at least one multi-layer ceramic capacitor part includes charging, holding, and/or discharging at least one part with respect to a programmed voltage over a predetermined period of time, periodically measuring at least one value corresponding to quality of each part to be tested while each part is being charged, held, and discharged. The at least one value can be selected from a group consisting of voltage value, current value, leakage current value, capacitance value, dissipation factor value, and any combination thereof. Curves can be digitized from the periodically measured values collected while each part is being charged, held, and discharged with respect to the programmed voltage.

Abstract: A fixing device including a shank and a head. The shank has formed thereon a helical thread configuration including a pair of spaced helical ridges with a helical groove defined therebetween. The height of the ridges is reduced at both ends of the shank with their height gradually increasing over one convolution from an end opposite the head, and decreasing over half a convolution to an end nearest the head.

Abstract: A masonry fixing device 1 comprises a steel shank 2 which in the form of the blank is right circular cylindrical form. A ridge-groove-ridge configuration extends helically along the lower portion 4 of shank 2 and comprises a pair of parallel opposed ridges 7 upstanding from an adjacent land 9. Each ridge defines with the adjacent ridge a groove 5. At least the forward end of the lower portion 4 of shank 2 is configured so as to provide a self-tapping facility. In use, the fixing device is introduced into a pre-drilled bore in a masonry substrate such as brickwork by turning so as to form a thread on the interior walls of the bore. The axial dimension of the land 9 is at least 50% of the blank diameter with the result that relatively large amounts of substrate material are disposed between the ridge-groove-ridge configuration when the fixing device is in place.