摘要:
A vibration attenuator (301) for attenuating vibrations in a mast of an aircraft is disclosed. The vibration attenuator comprises a first spinner (215) configured for rotation about a first axis; a first mass (307) coupled to the first spinner for rotation therewith, the first mass being movable radially relative to the first axis between an inner position and an outer position; an actuator (311) coupled to the first mass for selectively controlling a radial location of the first mass relative to the axis; and a first motor for driving the first spinner in rotation about the first axis.
摘要:
A mounting assembly is provided for mounting a product, for example a cable feeder, accessory or roller, to a cable tray. The cables can be laid on the cable tray for routing through a building. The mounting assembly includes an elongated rod, first and second arms extending downwardly from the rod and attached to the cable tray, a ratchet mechanism attached to one of the arms, and an attachment member on the other of the arms. The ratchet mechanism includes a ratchet and an extendable and retractable strap. The strap can be extended around the bottom of the cable tray and attached to the attachment member. This quickly and easily installs the product on the cable tray.
摘要:
Disclosed is an air conditioning system for an aircraft which utilizes high pressure bleed air. The bleed air is pressure controlled and introduced into a vortex cooler which can be operated in two modes using a valve. In a first mode, the bleed air is divided into cold and hot streams. The cold stream is directed into the cabin for cooling purposes. The hot stream is released from the aircraft in a manner that it pulls ambient air across a heat exchanger. In a second mode, the bleed air is not divided, but passes through the vortex cooler as a common stream. The second mode is more commonly used in colder ambient air conditions.
摘要:
A device for measuring and isolating noise-creating imbalances in a paired telecommunications line has an internal circuit. The internal circuit includes a pulse generator. Pulses provided by the pulse generator are applied to an interface which includes balanced pathways to the conductors. The pulses are applied simplex (longitudinally) to the pair of conductors. Upon encountering a fault in the pair, a reflected metallic voltage signal is received by the interface. The reflected metallic voltage signal is sampled by an analog-to-digital converter. Data relating to the sampled signal is displayed for detection and location of faults on the pair.
摘要:
An embodiment of a spade bit (100) has straight grooves (128) at a lead angle (α) of 4 to 8 degrees placed on flat edges of the spade bit. In an alternative embodiment, a spade bit (200) has two steps (232a,232b) of straight grooves (228) at a lead angle (α) of 4 to 8 degrees placed on flat edges of the spade bit. In other alternative embodiments, a spade bit (300) has tapered flat edge which have straight grooves (328) at a lead angle (α) of 4 to 8 degrees placed thereon. The straight grooves on the flat edges of the spade bit allows the spade bit to pull itself through the workpiece with a minimal amount of penetration. The flat edges of the spade bit may also have cutting surfaces for cleaning the hole and permitting the easy removal of the spade bit from the hole after drilling.