The present invention provides a multi-purpose, snap-clamp system capable of releasably holding objects of medium weight. The system is one piece and injection molded of polypropylene or similar plastic. The system, which includes a resilient spring member having two end portions, two interconnected by a film-hinge control levers each connected to one of the end portions by a film-hinge, and at least one gripping member connected at one of the end portions to one of the control levers and capabl...

A heavy duty crane which essentially includes in combination: a first mobile and swivellable base unit, a boom mounted on the first base unit, a second mobile and swivellable base unit, a counterweight mounted on the second base unit, a link frame interconnecting the two base units, and a gantry structure supported on and across the two base units, wherein the link frame includes a front frame having a fore end thereof connected to the first base unit and a rear frame having a rear end thereof d...

A heavy duty chock, for use in preventing the movement of wheeled vehicles, particularly commercial or military aircraft, is triangular, preferably equitriangular in cross-section, has a longitudinal axis, and is divided transverse to its longitudinal axis into a number of triangular sections. The clock has an end section at each end thereof and a number of central sections located between the end sections. Each central section defines at least one space extending longitudinally therethrough. Th...

A heavy duty scraper tool comprises: (a) two steel plates extending in parallel relation to clamp a steel scraper blade therebetween, so that the blade projects forwardly from between the plates to present a forward scraping edge, (b) adjustable fasteners extending between the plates to clamp them toward and against said blade and so that the fasteners can be loosened to permit blade removal and replacement, (c) a connection integral with one plate and forming a pipe thread, (d) an elongated met...

In a heavy duty radial tire, a reinforcement belt 8 outward in a radial direction of the tire and a high-strength belt 13 inward in the radial direction are arranged between a radial carcass 2 and a tread rubber 4, and an intersect angle between cord 6a of an innermost wide-width slant cord layer 6 in the reinforcement belt 8 and cord 12a of an outermost narrow-width slant cord layer 12 in the high-strength belt 13 is not less than 10.degree. at an acute angle side, and narrow-width slant cord l...

A track link assembly having a first pair of track links, and a second pair of track links is disclosed. The track link assembly further includes a bushing having ends pressed into an inner boss of the second pair of track links. The track link assembly yet further includes a solid track pin positioned within the bushing and swaged to the outer boss of the first track links. The track link further includes a thrust ring interposed between the end of the bushing and the outer boss of the respecti...

A duty-cycle regulation method for deriving an output clock signal having a predetermined duty cycle from an input clock signal having an arbitrary duty cycle. Once the input clock signal is received, an output clock storage element is switched to a first state upon detecting a transition in the input clock signal for driving the output clock signal to a first signal level. The output clock storage element is then switched to a second state after a delay interval equal to a fraction of the perio...

Duty measuring circuitry of the present invention includes a pulse detecting circuit for detecting at least one of a convex pulse width and a concave pulse width included in an input data signal. A duty decision circuit determines whether or not the convex pulse width or the concave pulse width detected is smaller than a preselected value. If the detected pulse width is smaller than the preselected, the duty decision circuit determines that the pulse width is valid, and feeds it to an averaging ...

In a heavy duty pneumatic tire comprising a tread, the tread is made of a rubber composition comprising 20-67 parts by weight of carbon black and 3-20 parts by weight of silica based on 100 parts by weight of diene based rubber, wherein the carbon black has a ratio of a dibutyl phthalate (DBP) absorption to a 24M4 DBP absorption (DBP absorption/24M4 DBP absorption) of not less than 1.20 and a ratio of the DBP absorption to a nitrogen adsorption specific area (N.sub.2 SA) of not less than 0.8.

A duty cycle correction circuit for a semiconductor memory device capable of exchanging data on both edges of rising and falling of clock by correcting duty error of input clock signal, including a phase detection unit for receiving input clock signals and reference clock signals to generate a phase difference detection signal comparing phase difference; loop filter unit for converting the phase difference detection signal into a voltage signal and outputting the result; multi phase signal gener...