Abstract:
A control for sequentially operating a pressure differential servomotor with air at atmospheric pressure and air above atmospheric pressure in response to an input force for developing an output force to energize an intensifying device to supply a braking system with pressurized fluid.
Abstract:
A linear motion mechanism is disclosed consisting of an output member comprising a slide block mounted for sliding linear movement on a slide frame, which slide frame is in turn detachably secured to a vertical drive assembly including a mounting frame having a vertically extending mounting surface formed thereon. The slide block is drivingly connected to a motion amplifying mechanism carried on the mounting frame including an input push link on which is rotatably mounted a rotary drive element engaged with a drive chain fixed at one end and connected at the other end to the slide block so that the motion of the slide block is an amplification of the motion of the push link in direction away from the chain ends. The push link is translated by a rotary cam and pivoted lever pinned to one end of the push link. The slide block and slide frame are adapted for use separately from the mounting frame and motion amplification mechanism by mounting it on a horizontal surface and directly engaging the slide block with a rotary cam.
Abstract:
Several heterodyne microscopes are illustrated herein in which light from a point source is directed to interfere with light scattered from an object to provide a large area interference pattern representing a point on that object. Scanning apparatus varies the interference pattern to represent different object points. Conventional heterodyne signal processing apparatus processes light from the interference pattern to provide an image. The resolution of the image is determined by the size of the point source and by the percentage of the area of the interference pattern from which the processing apparatus receives signals. A high resolution image is obtained by using a small pinhole aperture to provide the point source and by using a diffusive surface to receive and scatter light from the interference pattern to the signal processing apparatus.
Abstract:
An apparatus for measuring the displacement of a part such as a work performing tool or a measuring probe of a flatness measuring instrument. The apparatus includes means for providing a collimated laser beam that is disposed parallel to and displaced slightly from a predetermined plane of motion. Two identical prisms are placed side by side to intercept different portions of the laser beam. These prisms direct the intercepted portions of the laser beam to intersect and provide an interference pattern comprising a series of adjacent interference planes. An optical grating is attached to a part that is to be moved nominally along the predetermined plane of motion. This grating intercepts the interference planes and provides a Moire fringe output signal that varies in response to any displacement of the part perpendicular to the plane of motion. Electronic apparatus detects and measures this Moire fringe pattern variation and provides an output indicating the magnitude and direction of any perpendicular displacement.
Abstract:
A measuring machine of the type having a probe supported by carriages for precision movement along the ''''X,'''' ''''Y,'''' and ''''Z'''' axes which features improved ''''spool'''' bearings for the carriages and probe to minimize way machining costs, and/or the number of bearing adjustments and their total number and also featuring an improved X-axis carriage geometry and bearing support arrangement to minimize overall machine size and deflections caused by traversing of the probe in the ''''Y'''' plane.
Abstract:
A proportioning valve is installed in the rear brake line of the vehicle equipped with separate brake hydraulic systems for the front and rear brakes. The proportioning valve permits uninhibited fluid communication to the rear wheel brakes until a first pressure level is attained whereupon the valve restricts flow of fluid to the rear wheel brakes to establish a lower fluid pressure level in the latter than the fluid pressure level communicated to the front wheel brakes. An additional valve in the rear brake line is responsive to the pressure differential across the proportioning valve to terminate fluid communication to the rear wheel brakes when the pressure differential across the proportioning valve attains a predetermined amount. This feature enables the relationship between the braking pressure delivered to the rear wheel brakes and the braking pressure delivered to the front wheel brakes to approximate closely the ideal pressure relationship. In one embodiment of the invention, the point at which fluid communication to the rear wheel brakes is initially restricted by the proportioning valve varies as the rate of deceleration of the vehicle varies. In a second embodiment of the invention, the pressure level at which the proportioning valve initially restricts fluid pressure communication to the rear wheel brakes varies as the load carried by the rear axle of the vehicle varies.
Abstract:
A control valve for use in a tow vehicle-trailer system to synchronize the activation of the trailer brakes with the brakes of the tow vehicle. The control valve transfers an operational signal to a servometer which pressurizes a first fluid to activate the trailer brakes in response to a second pressurized fluid which activates the brakes of the tow vehicle. A piston within the control valve has a first face joined to a smaller diameter second face by a stem with an axial opening. The second pressurized fluid acts on the first and second faces to move the axial opening against a seat when the pressure of the second pressurized fluid reaches an initial predetermined value. An increase in the pressure of the second pressurized fluid will act on the second face and move the piston away from the seat to allow the increase to modify the operational signal to the servometer.
Abstract:
An electrohydraulic servo valve design is described having a pair of parallel-directed nozzles connected through conduits to a source of operating fluid under pressure with a load piston connected to the conduits such that its ends communicate with the pressure immediately upstream of the nozzles. A torque motor operates a flapper valve to restrict one nozzle and reduce the restriction of the other to vary the conduit pressure to create a control pressure differential across the load piston. Connected between each of the conduits and the fluid pressure source is a pair of orifices with a reed valve positioned therebetween and supported such that it responds to the control pressure differential to further restrict one of the pair of orifices while reducing the restriction of the other. In this manner, pressure in one conduit having the higher pressure is communicated to the reed valve which moves away from its corresponding orifice to permit the pressure in that one conduit to increase to a value even closer to the supply pressure than before. At the same time the pressure in the other conduit which was reduced is further reduced as the reed valve further restricts the area of its corresponding orifice. Thus, for a servo valve of a given size, the described pair of orifices and adjacent reed valve operate to substantially increase the pressure differential across the load for a given displacement of the flapper valve near null position.
Abstract:
Method and apparatus for imaging both moving and stationary objects in a holographic system that irradiates an object with coherent acoustic energy. In the different disclosed embodiments, the irradiation is generated by an array of acoustic transmitters which are either each driven in a predetermined sequence at a different frequency or simultaneously driven at different frequencies or by a single scanning transmitter which is driven either at a different frequency in each of several selected scanning positions or at a continuously varying frequency. This reflected radiation is detected by a receiver array which develops corresponding electric signals. A processing control provides phase comparison between the detected signals and a reference frequency signal and also filtering to develop an imaging signal corresponding to the amplitude of the receive signal and the phase difference between the two signals. These imaging signals are developed in sets for each discrete frequency and stored until a readout is wanted and then are supplied to a hologram display device to facilitate a reconstruction of the image.
Abstract:
A rotary actuator of the type in which an eccentrically positioned floating rotor is orbited about the axis of an output member drivingly engaged therewith and adapted to be driven by the rotor orbiting motion, featuring an arrangement providing magnetic forces acting on the rotor so as to maintain the output member and rotor in engagement as the rotor orbits about the output member axis, taking the form of permanent ring magnets disposed to create a toroidal magnetic field about the output member axis so as to magnetically attract the rotor in a direction to maintain its engagement with the output member as it orbits about the output member axis.