Abstract: A directly viewable speed display device for vehicles is located within the visual field of an operator of the vehicle. The display device uses a light illumination source such as a lamp, light emitting diode or exit ends of light guides to denote the actual vehicle speed which can be compared to an illuminated scale. In its simplest form, the illuminated scale can be a single point of light and the light illumination source can also be a single point of light.

Abstract: An optical display of vehicle speed wherein a series of diodes is mounted in an optical speed display assembly to project a series of lights onto a windshield such that the reflections can be seen without changing the focus of the operator as the operator is operating the vehicle. By means of such reflections an operator can determine the speed of the vehicle while maintaining the focus of his eyes on the roadway.

Abstract: An expansion device for converting changes in fluid pressure to displacement of a moving machine part or converting displacement of a moving part to changes in fluid pressure, the device featuring a first flexible expansion chamber wall at least partially defining a first expansion chamber region, a first rigid member having a convex surface supporting the chamber wall, a second rigid member having a concave surface facing the convex surface and movably mounted relative to the first rigid member to cause, when the first and second rigid members move together, the wall to fold over so that a portion of the wall's inner surface changes from an expanded concave shape to a convex shape adjacent to the first member, and a displacement connector attached to one of the first and second rigid members for connection to a moving machine part.