Abstract: A device for simultaneously tapping threads and performing the usual operations of a punch press is described in which the tapping device is attached to the upper and lower plates of a punch press. As the punch plates are brought toward and away from each other, gear trains and helically grooved lead screws change the up and down motion into rotating motion. The gear trains also change the speed of the rotating motion which is used to drive a thread tapping tool through the metal being formed in the punch press. If there is too much force opposing the tapping operation, an electrical contact in the device is opened and the punch press stopped before the tap or tapping device can be damaged.

Abstract: A bib for protecting a wearer's clothing during eating having fastening means to secure it about the neck is made of a flexible fabric having a highly light reflective coating or layer on the outer surface thereof. Ambient light received upon the reflective coating is directed upwardly upon the face and hair of the wearer to enhance the wearer's appearance.

Abstract: There is disclosed a surgical stereotaxic array plug of biocompatible material having an outer periphery adapted to be secured in a complementary threaded opening provided in the skull with bores traversing the plug for receiving and positioning therapeutic apparatus and fluid dispensing devices.

Abstract: Apparatus for positioning, centering and holding film within a large format industrial camera for exposure within a light-tight exposure chamber, the bottom of which holds a transparent plate to receive the film at the focal plane, a two piece platen of flat rigid material, hinged together in abutting relationship, is carried above the transparent plate. One of the platen pieces is provided with a series of elongated slots therethrough to receive a series of elongated stops. The stops are yieldably carried by said platen piece for movement through the slots in the platen piece into the path of the desired size of film as it is slid across the plate and under the platen pieces. A control arm of generally "L" shape is swingably carried on each of the elongated stops. The control arms are selected for the desired film size and can be located and swung into position by a single finger operation without need for seeing them.

Abstract: A viewer for producing the illusion of three-dimensional images from two-dimensional moving image displays which includes a spectacle-like support having a frame and lateral bows on the frame for engagement with the ears of the user. The frame is made of opaque material in which a rectangular opening is provided for each eye of the user. Forwardly extending, tubular light shields are carried by the frame around each rectangular opening. Band pass light filter within the rectangular openings permit one eye to see only with cone vision the other eye only with rod vision.

Abstract: A hollow baseball bat having a hollow elongated ball hitting portion of a substantially triangular cross-sectional shape and a flattened curved hitting face is internally braced by elongated substantially plate-like members disposed between the hitting face portion and other interior surfaces of the ball hitting portion. Various forms of braces and attachment to the interior of the hitting portion are disclosed.

Abstract: A control system for driving a variable speed AC motor employing a fixed frequency AC power source, combines pulses representative of a desired slip frequency with pulses of a frequency proportional to the speed of the motor. The combined pulses are employed with a speed command signal to set a threshold which determines the fraction of each cycle of the AC primary power which is fed to the motor. In addition, the speed and slip pulses are employed to direct the AC power to specific ones of the windings of the motor to thereby create a rotating magnetic field in the induction motor. An array of silicon-controlled rectifiers does the actual gating and an SCR protect circuit ensures that transfer of control from one SCR to another is inhibited until all current ceases to flow in an SCR being extinguished. A forced commutation circuit forces the extinction of all current remaining in the last conducting SCR feeding a motor winding at the transfer time from that motor winding to the next.

Abstract: A racket having strings strung across the head portion of the frame in which the strings have threaded end portions for engagement with correspondingly threaded nuts. Additionally, the threaded portion of the string can extend the entire length of the string so as to provide the string with a surface that imparts more spin to the ball. The surface of the strings is also provided with markings. When the string is tensioned in the frame through turning of the nuts, the distance between markings is increased due to elongation of the string. This elongation can be translated into a particular increase in tension by use of a suitably calibrated scale.

Abstract: An automatic draw bar for removably securing machine tools carried by a tool holder within the spindle of a milling machine or the like, in which the tool holder is formed with an internally threaded bore. The spindle is provided with an elongated bore having a recess at its end to receive the shank of the tool holder. A hollow draw bar is slidably carried within the spindle and is exteriorly threaded at one end with a thread engagable with the tool holder interior thread. An elongated draw bar expander slidably carried within the draw bar and responsive to a source of linear power is adapted to couple the threads on the draw bar and tool holder to draw the tool holder into frictional engagement with the spindle upon activation of the power source.

Abstract: A method of diffusing dopant material into the crystal surfaces of silicon crystal slices which comprises placing the dopant material in the form of wafers between the adjacent major faces of each of a stack of silicon crystal slices, clamping said slices and wafers together as an assembly within a refractory boat so that the crystal slices are in substantially parallel vertical disposition with their entire facing surfaces covered by dopant material and thereafter introducing the boat and the assembly into a zone of high temperature wherein the dopant material is simultaneously diffused into the major faces of the silicon crystal slices. Other arrangements of silicon crystal slices and dopant wafers of the same or different materials can produce slices diffused on both sides with the same dopant or with a different dopant material on each side.

Abstract: A post-operative patient drainage and irrigation apparatus, employing a simplified two-position valve to control the passage of fluids into and out of the body of the patient. A two-channel catheter directs body fluids into and out of the control valve. A first flexible tube directs irrigating solutions from a source into the control valve. A second flexible tube, attached at one end to the control valve, serves as a waste conduit from the said valve to a waste receptacle. Check valves carried in rubber squeeze bulbs in the first and second flexible tubes further control the direction of fluid flow and serve to clear obstructions in the apparatus. A simple control changes the two-position control valve position from one mode to another.

Abstract: Apparatus for dispensing paint or other liquids having a rotational valve actuable between a dispensing position and a suction position and a piston and cylinder assembly in flow coupling relation to the valve, and having a base plate for rotationally positioning the piston and cylinder assembly between the dispensing position and the suction position, including an inclined plane for imparting a predetermined suction movement of the piston during the rotational positioning.

Abstract: A substrate is irradiated in a pattern with a neutron beam at energy levels well below those which produce either atomic reactions or physical disruption of the substrate structure. When etched with a suitable etchant, the irradiated portions are preferentially etched to produce a pattern corresponding to the irradiated pattern. In one embodiment of the invention, aluminosilicate crystals are irradiated with neutrons and are etched with hydrofluoric acid to produce the etched structure.