Abstract: A spring retainer (10) for a poppet valve (18) which is biased by a valve spring (16) and a method of assembling the spring retainer (10) the poppet valve (18) and a valve spring (16). The spring retainer (10) has first and second body portions (30, 32). Each body portion (30, 32) has a spring flange segment (50), for engaging a valve spring (16), and a finger segment (54), for extending into a groove (26) on a valve stem (20) of the poppet valve (18). The spring retainer (10) has a slot (44) which permits relative movement between the first and second body portions (30, 32) such that the spring retainer (10) may be installed on the poppet valve (18). The spring retainer (10) has frangible web segments (36) for retaining the first and second body portions (30, 32) together prior to installment of the spring retainer (10) on the poppet valve (18). The web segments (36) break during installation of the spring retainer (10) to permit outward movement of the first and second body portions (30, 32).

Abstract: A radio broadcasting system is provided for transmitting and receiving through free space a fully coherent multicarrier modulated digital signal which is especially adapted to be resistive to multipath degradation. The multicarrier modulated signal is a synthesized vector-modulated signal which is a quadrature phase shift keyed (QPSK) modulated set of synthesized carriers phase coherent with each other and each occupying a spectrum replicated multiple times within a bandwidth with no more than two bits per vector. An efficient channel coding consisting of large block size, high efficiency block coding, such as BCH 255, 239 code, is employed in connection with time interleaving of bits to mitigate the effects of frequency selective multipath and broadband multipath. The broadcast system is designed to be used in support of compressed digital audio programming material.

Abstract: A radio broadcasting system is provided for transmitting and receiving through free space a composite signal consisting of a frequency modulated (fm) analog signal and a multicarrier modulated digital signal which is especially adapted to be resistive to multipath degradation. The fm signal and the digital multicarrier modulated signal are fully coherent. Further according to the invention, the digital signal comprises a plurality of carriers having a maximum amplitude at least 20 dB below the unmodulated fm signal and preferably, 30 dB below the analog signal. The multicarrier modulated signal is phase locked according to the invention to the recovered analog fm pilot tone at 19 kHz in the composite baseband spectrum of the fm signal which is at least 20 dB above the multicarrier modulated signal, which enables rapid and reliable acquisition of signal for coherent detection.

Abstract: A spring retainer for a poppet valve having a valve stem and a groove in the valve stem. The poppet valve is biased by a valve spring. The spring retainer includes a one-piece annular body having an opening through which the valve stem extends. The body has a spring flange encircling the body. The spring flange has a surface agains which the valve spring acts. The surface lies in a plane. The body further has members which deflect outwardly as the valve stem is inserted into the opening. The members snap into the groove to lock the retainer to the valve stem. The members include a plurality of fingers extending inwardly toward the opening and extending upwardly from the plane. Each of the fingers has an upper surface which tapers upwardly and inwardly as it extends from the spring flange and an inner surface for engaging the valve stem.

Abstract: A pre-assembled unit 10 for use in assembly of an engine valve system 150 in an engine 152. The pre-assembled unit 10 includes a spring 14 for providing a force for urging an engine valve 156 in a first direction, a spring seat 20 engaged with the spring 14, a spring retainer 78 for maintaining the spring 14 in a concentric position around the valve 156, and locks 82 for lockingly engaging the spring retainer 78 and the valve 156. The spring retainer 78 and the locks 82 transmit the spring force to the valve 156. The pre-assembled unit 10 includes a retention member 120 for temporarily maintaining the spring 14, the spring seat 20 and the spring retainer 78 together prior to installation into the engine valve system 150. The retention member 120 cooperates at its upper section 130 with the locks 82 and at its lower section 124 with an oil seal 22 on the spring seat 20 to hold the spring retainer 78 and the spring seat 20 in engagement with the spring 14.

Abstract: An automobile jack and wheel chocks assembly for automobiles wherein a jack and wheel chocks are stored in the vehicle as a concise spacing saving unit. The chocks include structure which receives and locates the jack, and the chocks are positioned in the vehicle by locating pins.

Abstract: A triaxial contact assembly for terminating a screened twisted pair of wires comprises three contact members (12,14,16) and a ferrule (18). The inner contact (12) is of conventional construction but the intermediate contact member (14) consists of an intermediate contact (20) to which are secured the inner insulator (34) and a spacer member (40). The outer insulator (54) is fixed to the outer contact (52). The number of separate components required to be assembled by the operator is thus reduced and assembly made quicker and easier.

Abstract: A streaking or framing image tube includes a photocathode (4), three grid electrodes (1, 2 and 3), a focus electrode (5) and an anode (6) disposed successively along the image tube. The tube is gated by applying a positive voltage pulse first to the second grid electrode (2) and then to the photocathode (4), the delay time between the application of the pulse to the second grid and the photocathode being the gated "on" time of the image tube, while during the application of the pulse to the second grid electrode (2) and the photocathode (4), the potentials of the first and third grid electrodes (1, 3) are held constant at a constant value, and accordingly ultra high speed gating (e.g. allowing the passage of electrons for less than 10.sup.-9 seconds) can be achieved without effect on the magnification or resolution performance of the image tube.

Abstract: A shielded electrical connector includes a housing arranged to receive a shielded cable, a connector for connecting the cable shield to the connector housing, a connector element located in the housing with contacts connected to tracks on a printed circuit board within the housing, a ground plane spaced from the printed circuit board and electrically connected to the connector housing and a plurality of surge arrestors located between respective tracks on the printed circuit board and the ground plane. A resiliently flexible member may be located between the connector housing and the ground plane for making an electrical connection between the housing and the ground plane.

Abstract: An electrical connection housing, especially for undercarpet cable systems, including a fixed member (50) which is to be secured to a flat surface and which has an outer side face for receiving a module member (220, 222, 224). The module member has an inner face which conforms to the outer side face of the fixed member (50) and engagement extensions (230) which extend under the outer side face of the fixed member (50) for retention between the fixed member and the flat surface. Recesses (232) are provided in the bottom of a shroud (200) to receive T-shaped extensions (230). The module member may include telephone outlets, data outlets or power spurs.

Abstract: A push-on pull-off connector member 30 for coupling to a standard bayonet receptacle 10 has three equi-spaced circumferential slots 36 for receiving the bayonet pins 20 of the receptacle 10. Spring rings 40 in circular recesses 38 opening into the slots 36 from each side retain the pins 20. The recesses 38 are easily formed, for example, by milling. The coupled connector resists a weak uncoupling force but separates under a strong force, and can provide a snatch-disconnect facility.In alternative embodiments, each slot 36 has a single circular ring (FIG. 6), two spring rings are formed at each end of a single member (FIG. 4), the rings have inwardly-directed tangs for ease of fitting and removal (FIG. 5), or the spring rings are parts of question-mark shaped members (FIG. 7).

Abstract: High-toughness, high-wear resistance cutting tool based on alumina are formed by additions of zirconia and optionally refractory metal carbides or nitrides.

Abstract: Extremely tough, strong and wear resistant cold pressed and sintered inserts consisting essentially of from about 4 to 20% zirconia, from about 1-15% titanium diboride, and up to about 10% grain growth inhibiting sintering aid with the balance being alumina.

Abstract: The invention relates to screw-coupled electrical connectors. It is known to provide screw-coupled electrical connectors with means for providing an indication of the fact that the two parts are approaching or have reached the fully mated condition and for resisting subsequent rotation of the coupling sleeve in the uncoupling direction. However, this has been accomplished only with complex and expensive mechanisms such as movable balls mounted in a flange on the first connector part and a series of holes in a flange on the coupling sleeve.

Abstract: Identical strips of magnetic metal having alternating slots and pole teeth long one edge are cut from sheet material in a pattern minimizing waste of metal, stacked, and bent into a cylinder or sector of a cylinder. The ends of the stacks are then fastened together to form a rotor or stator.