An attachment means for interconnecting two bicycles of similar size in side-by-side relation, of either a man or woman's design, which is composed of a plurality of lateral rigid rods and connections of the rods to the frames of the bicycles through hinge means at the rear compensating for relative vertical displacement of the bicycles through a hinge type action, which includes shock absorber means, and ball and socket means on the rigid bars interconnecting the forward end of the bicycle fram...

A method is disclosed for two-stage stretch forming of a sheet metal blank workpiece between a preform tool with a concave cavity and an opposing finish-form punch tool. Both tools are independently heated to different forming temperatures with the preform tool being hotter. Gas pressure is first applied to one side of the workpiece in the first forming stage to balloon it into the cavity of the preform tool. Gas pressure is then applied to the other side of the preformed workpiece to stretch it...

A DRAM array having a number of two-port cells (10) arranged to permit the simultaneous read and write operations of different cells within the array. Each column of the array includes a refresh circuit (40) which is responsive to a four-phase clock for carrying out refresh operations which are transparent to the programmer. When used in microcomputer applications having four-phase clocks, the DRAM array of the invention functions similar to a static RAM, in that refresh is automatically underta...

A tool with two shanks and two handles, where the shanks are pivoted in a shank fulcrum which is located rearwardly of the handle fulcrum. In a preferred embodiment, the shank and handle fulcrum are spaced at a distance equal to at least a third of the total length of the tool so that a near-parallel position of the front ends of the shanks is achieved in a final phase of their closing movement.

Retroreflecting elements adapted for use in two-by-two optical routing elements. Each retroreflecting element is configured to selectively retroreflect two optical rays. A first reflective surface, such as may be provided by a mirror, is inclined with respect to a reference plane. A second reflective surface, such as may also be provided by a mirror, is opposed to and inclined with respect to the first reflective surface. The two surfaces are configured for rotation about an axis to multiple pos...

A two input, two output optical switch includes two movable mirrors. Each movable mirror is used for two optical signal reflections, one from an input fiber collimator to the same or a different movable mirror via a fixed cover mirror, and one from the same or a different movable mirror via the fixed cover mirror to an output fiber collimator. A single electrode may be used to control the mirror positions.

A sensor system senses a scene and includes a dual-band imaging infrared detector lying on a beam path, wherein the infrared detector detects infrared images in a first infrared wavelength band and in a second infrared wavelength band; and a two-color cold-shield filter lying on the beam path between the infrared detector and the scene. The cold-shield filter defines a first aperture size for infrared light of the first infrared wavelength band, and a second aperture size larger than the first a...

A two-terminal, two-color indicator lamp assembly comprising two separately energizable filaments positioned behind different-colored portions of the lamp envelope along the line of sight. The lamp envelope is mechanically connected to a pair of terminals to form a telephone slide base, and a pair of diodes is interconnected between said terminals and said filaments to enable energization of one filament only when the polarity of the first terminal is positive with respect to the polarity of the...

The present invention is a two-wheel drive motorcycle. The drive trait that supplies power to the front wheel is modified to include a series of rigid shafts or other internalized drive systems. The front wheel drive consists of components located on the axis of steering within the head tube and positioned symmetrically in a counterbalancing fashion within the front fork in order to counteract the torque reactions from the rotating front wheel drive while providing a full range of steering. The ...

Improved bolt force indicators and methods for work hardening of yielding bolt force indicators incorporating a yielding section designed so that its plastic deformation indicates the existence of a predetermined bolt force. The work hardening, done after manufacture and before use, greatly increases the sensitivity of the indicator to the predetermined force level. In the indicator device without work hardening, a specified amount of plastic deformation is needed to signal the existence of the ...