Abstract: An oil filter assembly for an internal combustion engine includes a body (31) which provides inflow and delivery passages and an attachable filter element container (45) which is attached to the body by a screw-thread at its open end to enclose a cylindrical pleated paper filter element (41) which is located by a perforated support tube (35) carried by the main body, the filter element (35) is sealed at one end against the body and is axially positioned by a spring (38) acting between the closed end of the container and a disc-like closure member (42) which thereby maintains engagement between one end of the filter element and the main body and sealing closure of the other end of the filter by the closure member sealing, the radial and axial compression of the filter element being limited by the support tube.

Abstract: A deflection drive circuit (15) for an inductive yoke (11) used with a raster scanned cathode ray tube rapidly interrupts current then reverses voltage applied to the yoke (11) during flyback. MOSFETs (Q32, Q47) are used to control current flow to the yoke. The current is interrupted by one MOSFET (Q32) being gated "OFF", after which current is permitted to flow to a capacitor (C51). At a preselected time, a second MOSFET (Q47) is gated on to admit reverse flow of current from the capacitor (C51) to the yoke (11). The second MOSFET (Q47) is gated "ON" by a circuit which includes a third MOSFET (Q57) and a pulse transformer (T59).Advantages include an ability to rapidly effect flyback without interfering with the forward scanning ability of the deflection drive circuit 15.

Abstract: A fail-safe solenoid switching mechanism (11) uses a reciprocating switch (15) to establish make-or-break connections. In order to increase the effective life of shorting bars on the switch, the switch's reciprocating part 23 is rotated by a ratcheting mechanism each time the switch (15) is cycled.Advantages include enhanced reliability, even when the switching mechanism (11) sees extended quiescant periods between operations.

Abstract: A stress limiter apparatus for a gas turbine engine (10) is disclosed. A proportional fuel fuel control (11) regulates the fuel flow (Wf) from a hydromechanical unit (36) based upon an error signal (E) representing the difference between a demanded speed signal (Nd) and an actual speed signal (N1). The demanded speed signal (Nd) is generated by an integrator (32) as the time integral of one of the acceleration terms (A1, A2, A3) selected by gate 38. The demanded acceleration term (A1) is generated by junction (26) as the difference between the demanded signal (Nd) and a scheduled speed signal (Ngs). The acceleration terms (A2, A3) are generated by junctions (44, 46) and scheduling means (40, 42) which form stress limiter circuits.

Abstract: A directional filter is constructed with a plurality of grooves (15) extending into a plate (13) from one side (16) thereof. The grooves (15) have a light absorbing characteristic which causes them to absorb light impinging upon the grooves, particularly light impinging upon the grooves (15) from within the plate (13). Since all light passing beyond a certain angle .phi. must impinge upon the grooves (13), and only a small percentage of light passing parallel to the cut of the grooves (15) would impinge upon the grooves (15), the filter has a high ratio of attenuation of unwanted versus wanted light.

Abstract: A guided projectile (11) is provided with a gyroscope (29) having a spherical rotor (41). The rotor (41) is supported at its outer spherical surface by a stator (42) using fluid bearing techniques. The stator (42) is fixed to the projectile's housing (38) so that the gyroscope (29) is operated in a strapdown mode.The structure of the gyroscope (29) and particularly the stator (42) places very little material along its center axis of the projectile (11). This is particularly useful where the projectile's warhead (17) functions by squirting a stream (25) of metal through a target's armor, and any material in the way of the stream (25) would tend to diminish the lethality of the projectile (11). The spherical configuration of the rotor (41) and the use of the stator (42) as a support bearing also provides a method of supporting the rotor (41) during conditions of high acceleration which are experienced in cannon launch of the projectile (11). Other advantages include light weight, low cost and high reliability.

Abstract: A method and apparatus for acceleration limiting a gas turbine engine (10) is disclosed. A proportional fuel control (11) regulates the fuel flow Wf from a hydromechanical unit (36) based upon an error signal E representing the difference between a demanded speed signal Nd and an actual speed signal Ng. The demanded speed signal Nd is generated by an integrator (32) as the time integral of the difference between the demanded signal Nd and a scheduled speed signal Ngs. Additionally, the difference signal is limited between an upper limit A1 and a lower limit D1 prior to the integration by a comparator (28) and a limiter circuit (30). The acceleration limit, A1 is generated as a function of a nondimensional parameter ratio (dN/dt.times.N)/Wf.

Abstract: A vibration and noise isolating coupling (11) for a rotating drive train uses a plurality of vibration and noise isolating modules (17) which are arranged circumferentially about the coupling (11) in two rows (21, 22). Each module consists of a plurality of rubber sheets separated by laminations. A pair of drive discs (13, 14) sandwich the modules (17), and a driven disc (15) is located between the two rows (21, 22) of the module (17). Force transmitted from the drive discs (13, 14) is transmitted through the driven disc (15) via the modules 17. The drive discs (13, 14) are compressed toward one another, thereby compressing the module (17) and consequently the rubber sheets within the module (17).The arrangement provides the advantage of resiliently transferring rotating force to rubber components while maintaining the rubber in a compressed state and maintaining a power-transfer capability even if the rubber components are fully deteriorated.

Abstract: A flexible coupling (11) is formed with a toroidal diaphragm (21-22) as its flexible member. A pair of half-toroids (21-22) are fixed to inner rings (25, 26) and outer rings (27, 28) in order to effect connections. The inner rings (25, 26) are connected, respectively, to drive shaft sections (13, 14). The outer rings (27, 28) are used to connect the half-toroids (21-22) to each other. Torque from one of the drive shaft sections (13) is passed through one of the inner rings (23), through one of the diaphragms (21) through the outer rings (27 and 28) to the other diaphragms (22), the other inner ring (26) and to the other drive shaft section (14). Advantages include increased flexibility of a flexible coupling of a type which uses no bearing parts.

Abstract: A propeller brake for an engine having a propeller shaft includes a housing (10) and a brake shaft (18) rotatably mounted in the housing (10). The brake shaft (18) is coupled to the propeller shaft to rotate therewith. Also included is a brake (64,74) and a lock device (38). The brake (64,74) is mounted in the housing (10) and has a spaced plurality of frictional plates (64) for frictionally resisting rotation of the brake shaft (18). This brake (64,74) is reciprocatable between an operative and an inoperative position. The lock device (38) is mounted in the housing (10) and can reciprocate between an unlocked and locked position. This lock device (38) can, in its locked position, inhibit rotation of the brake shaft (18). The forgoing equipment can stop a propeller shaft by first frictionally coupling the brake (64,74) to the propeller shaft, allowing the coupled portion of the brake (64,74) to rotate therewith. The brake (64,74) may then be actuated to transmit a resisting torque to stop the propeller shaft.