Abstract:
A room temperature vulcanizable silicone rubber composition with high elongation and low modulus comprising 10-90 percent by weight polydiorganosiloxane having terminal hydroxyl groups, 1-10 percent by weight phenyl tris-functional ketoximino-containing silane crosslinker, 0-14 percent by weight of a reinforcing or 0-60 percent by weight of a nonreinforcing filler or semi-reinforcing filler or a mixture thereof for a total of all fillers in the range of from about 6-60 percent by weight, from 0-2.5 percent by weight of an organofunctional silane adhesion promoter and an optional plasticizer and catalyst. These compositions cure to elastic materials useful as caulking materials, adhesives, coatings and encapsulating materials for the construction and other industries.
Abstract:
A piston arrangement for a master cylinder (10) having a pin (68) for linking a center compensation valve (31) in primary and secondary piston (15, 16) with a stop member (28, 30). The primary and secondary pistons (15, 16) each have a pin (68) located in a blind bore (40) which has a cylindrical body (70) with a first semi-spherical head (72) on a first end and a second semi-spherical head (74) located on a second end. A valve return spring (58) acts on a poppet assembly (54) of each compensation valve (31) to position a stem (56) between the first and second semi-spherical heads (72, 74) to hold the pins (68) in the primary and secondary pistons (15, 16). When a piston return spring (20, 22) moves the primary and secondary pistons (15, 16) toward a rest position, the second semi-spherical heads (74) are held stationary as the pins (68) pivot about the first semi-spherical heads (72) to act on the stems (56) and move the poppets (54) away from seats (66) and communicate fluid from a source (27) to pressurizing chambers (24, 26) associated with the primary and secondary pistons (15, 16).
Abstract:
An electrical machine (22) incorporates foil bearings (24) which are radially interposed between the stator assembly (26) and the permanent magnet of a rotor shaft (12), thus reducing the required axial length of the shaft and increasing the rotational speed at which the shaft bends incident to resonance.
Abstract:
A housing (12) for a pump (80) having a cavity (14) therein formed by first (46) and second (48) side walls connected to first (50) and second (52) semicircular end walls. A pair of intermeshing gear members (16, 18) are journaled in a floating bearing and a fixed bearing are located in the cavity. The intermeshing gear members respond to a clockwise rotary torque to pressurize fluid in transporting a fluid from an entrance chamber (34) to a discharge chamber (38). The fluid in the discharge chamber acts on and urges the floating bearing and fixed bearing into engagement with portions of the first and second semicircular end walls and first side wall to seal the entrance chamber from the discharge chamber. The intermeshing gear members respond to a counterclockwise torque by transporting fluid from the discharge chamber to the entrance chamber to develop an internal fluid pressure. The internal fluid pressure acts on and urges the floating and fixed bearings toward the first and second semicircular end walls and second side wall. The housing has an axial slot (54) that extends from a first point (56) in the first semicircular wall (50), the second side wall (48) and to a second point (58) in the second semicircular wall (52) such that the floating and fixed bearing do not seal the discharge chamber from the entrance chamber and as a result the development of the internal pressure is limited to a function of the depth of the axial slot.
Abstract:
An active night vision system capable of viewing a target over long distances utilizes laser illumination in eye-safe, invisible wavelength regions of about 1.52 - 1.76 mu m or about 2.03 mu m - 2.34 mu m for illuminating a target; and electronically receives, intensifies and displays or stores the reflected image.
Abstract:
A turbofan engine fan stator assembly (26) includes stator vanes (40) readily insertable through the outer shroud (36) into the stator assembly hub (38). Elastomeric grommets (56) seal between the vanes (40), shroud (36) and hub (38), and an outer band (74) radially inwardly compresses the assembly. The vanes (40) are radially secured to the hub (38) only through frictional engagement with the hub grommet (56).
Abstract:
A vehicle antilock braking system having an operator controlled master cylinder (11, 11a) and a second source of pressurized hydraulic fluid (35) for selectively supplying rebuild pressure after an antilock event to simultaneously actuate each wheel braking device, and a solenoid actuated two position flow control valve (10, 10a, 25, 45) for each wheel in circuit between the source (11, 11a, 35) and the associated wheel braking device for selectively directing fluid from the source (11, 11a, 35) to the braking device to brake the vehicle, and from the braking device to relieve braking force has an improved hydraulic pressure actuated dual inlet, single outlet two position valve (21, 23, 49, 49a) for each of the wheels which is effective in a first position to pass hydraulic fluid from the operator controlled source (11, 11a) to the corresponding flow control valve (10, 10a, 25, 45) for selectively actuating the corresponding braking device, and in a second position to block the passage of hydraulic fluid from the operator controlled source to the corresponding flow control valve (10, 10a, 25, 45) and to provide instead a hydraulic fluid path from the second source (35) to the corresponding flow control valve (10, 10a, 25, 45). A bypass pressure regulator (43) responsive to master cylinder (11, 11a) and rebuild pressures to supply pressurized hydraulic fluid from the second source (35) to each of the pressure actuated valves (21, 23, 49, 49a) only when the operator controlled master cylinder (11, 11a) is supplying pressurized hydraulic fluid. The pressure of the hydraulic fluid supplied from the second source (35) to each of the pressure actuated valves (21, 23, 49, 49a) is directly proportional to the pressure of the operator controlled master cylinder (11, 11a) pressure. The master cylinder (11, 11a) has n chambers each selectively supplying pressurized hydraulic fluid to n corresponding control ports (63, 65, 67). The regulator (43) responds to these jointly, but non-additively to continue to function and supply rebuild pressure despite failure of any n-1 of the master cylinder chambers (11, 11a).
Abstract:
A roller ball bearing (14) for carrying both axial and radial loads from a rotating shaft (10) to a stationary housing (12) includes a resilient isolation mount ring (40) disposed between the housing (12) and the outer race (32) of the ball bearing (14). In addition to radially extending pads (42, 44) on the isolation mount (40) to define flexural beam portions (46) therebetween for damping radial motion, the isolation mount ring (40) also includes axially extending pads (48, 50) thereon which engage opposed, radially extending thrust shoulders (22, 39) on the housing (12) and the outer race (32) to transmit axial loading from the bearing (14) to the housing (12). The axial pads (48, 50) space and isolate the radially flexing beam portions (46) of the isolation mount ring (40) to provide a frictionless bearing assembly.
Abstract:
An improved backlighting apparatus comprising a slab waveguide (6) that accepts light rays generated by a light source (4) and transmits the light rays via total internal reflection. Attached on one face of the slab waveguide is an array of microprisms (28), with each microprism (28) having a light input surface (30) parallel to a light output surface (32) and at least one sidewall (33) tilted at an angle from the direction normal to the surface of the waveguide (6) such that light rays escape from the slab waveguide (6), reflect off the tilted sidewall (33) and emerge from the microprism (28) as a light source substantially perpendicular to the light output surface (32). An array of microlenses may be positioned to accept the output of the microprisms so that the light exiting from the microlenses is substantially more perpendicular. The backlight apparatus is advantageously used as a backlighting means for flat panel electronic displays.
Abstract:
A thrust bearing assembly for retaining a ball screw (108) of an actuator in a housing (86) and driving a position sensor in a control system. The thrust bearing assembly (110) has a cylindrical body (114) with an annular radial projection (122) having parallel first and second inner outer race surfaces (128, 130, 148, 154). Gear teeth (124) are located on the peripheral surface (126) of the radial projection (122). First and second roller bearing (150, 156) and associated first and second outer races are located on said cylindrical body. A locating plate (159) attached the housing urges the second outer race toward the housing to bring the second roller bearing into engagement with the second inner race and the first inner race into engagement with the first roller bearing and first outer face to fix the position of the ball screw in the housing. The ball screw (108) is connected to receive rotary torque from a drive gear to position a translating ball nut within the housing. Rotation of the ball screw correspondingly rotates the cylindrical body such that the gear teeth on the peripheral surface provides a sensor (112) with a signal indicative of the location of the ball nut within the housing.