摘要:
A hitch assembly for coupling a trailer to a tow vehicle includes a number of assemblies, including converging links and a slide assembly, that effectively places the pivot point for the trailer ahead of the actual hitch assembly, which in turn enhances the stability of the combination tow vehicle and trailer, rendering it less susceptible to swaying or fishtailing.
摘要:
An insulator electrically insulates a bolster plate. The insulator preferably includes a sheet of insulating material sized and shaped to insulate the bolster plate and at least one hole through the sheet of insulating material for accommodating a fastener for securing the sheet of insulating material to the bolster plate.
摘要:
A blast cleaning machine for impacting workpieces with high speed abrasive particles includes a conveyor in the form of a generally horizontally oriented cylindrical cage. The cage has a hollow center within which workpieces are disposed and a wall in the form of a helix. The inner diameter of the cage and the pitch of the helix are such that the cage supports, rotates, and translates the workpieces. A rod can be secured to the inner surface of the wall in order to assist in rotating the workpieces as they move through the cage. In the preferred embodiment, the ratio of the inner diameter of the cage to the pitch of the helix is approximately 2.2:1.
摘要:
A resilient, electrically conductive EMI gasket is disposed between two jaws. A cam-lever or other actuator is operably linked to the jaws. The cam-lever can be used to drive the jaws closer together, thereby squeezing the gasket and causing a portion of the gasket to protrude, preferably beyond an edge of at least one of the jaws. The protruding portion of the gasket contacts a mating surface of an opening, through which a device was installed, or a mating surface on an adjacent device. This contact seals the space between the EMI gasket mechanism and the mating surfaces, i.e. the contact closes a gap and thus maintains a continuous EMI shield therebetween. The gap is closed against passage of EMI radiation without relying on device insertion force to cause the EMI gasket to adequately contact the mating surface. Alternatively, an inflatable resilient EMI gasket is in fluid communication with a pump, and an actuator is operably linked to the pump. The actuator can be used to operate the pump and, thereby, inflate the gasket, thus causing a portion of the gasket to protrude and contact a mating surface.
摘要:
A device for assembling circuit boards. The device has an upper surface for receiving a compressing force. The device also has a lower surface for compressing a number of compression devices in a land grid array assembly while allowing access to a number of fasteners associated with the compression devices. The device is able to assist in the formation of an electrical contact between a chip package in the land grid array assembly and a circuit board by the lower surface being pressed against the compression devices to compress the compression devices and then allowing the plurality of fasteners to be tightened.
摘要:
An apparatus in one example has a liquid lubricant having a viscosity and surface tension such that, during engagement of a first segment, which has a threaded portion, and a second segment, which has a plurality of threads which are interlockable with the threaded portion of the first segment, friction between the threads of the first and second segments is reduced and metallic debris becomes substantially embedded in the liquid lubricant.
摘要:
A force distributor is configured for disposition between a printed circuit board and a stiffening plate, which is spaced from the printed circuit board. The force distributor is configured to distribute a compressive force between the printed circuit board, an interposer and a land grid array module carried on a side of the printed circuit board opposite the stiffening plate. The force distributor comprises a spring element comprising a first portion and a second portion with the first portion extending radially outward from the second portion. The spring element is configured for placement so that the first portion is secured to the stiffening plate and the second portion is biased in unsecured, pressing contact against the printed circuit board.
摘要:
A device for assembling circuit boards. The device has an upper surface for receiving a compressing force. The device also has a lower surface for compressing a number of compression devices in a land grid array assembly while allowing access to a number of fasteners associated with the compression devices. The device is able to assist in the formation of an electrical contact between a chip package in the land grid array assembly and a circuit board by the lower surface being pressed against the compression devices to compress the compression devices and then allowing the plurality of fasteners to be tightened.
摘要:
A force distributor is configured for disposition between a printed circuit board and a stiffening plate, which is spaced from the printed circuit board. The force distributor is configured to distribute a compressive force between the printed circuit board, an interposer and a land grid array module carried on a side of the printed circuit board opposite the stiffening plate. The force distributor comprises a spring element comprising a first portion and a second portion with the first portion extending radially outward from the second portion. The spring element is configured for placement so that the first portion is secured to the stiffening plate and the second portion is biased in unsecured, pressing contact against the printed circuit board.