초록 ▼

A gas turbine engine aspirating face seal includes a rotatable engine member and a non-rotatable engine member and a leakage path therebetween. Annular generally planar rotatable and non-rotatable gas bearing face surfaces circumscribed about a centerline are operably associated the rotatable and no

A gas turbine engine aspirating face seal includes a rotatable engine member and a non-rotatable engine member and a leakage path therebetween. Annular generally planar rotatable and non-rotatable gas bearing face surfaces circumscribed about a centerline are operably associated the rotatable and non-rotatable engine members respectively. Radially inner and outer tooth rings axially extend away from a first one of the rotatable and non-rotatable gas bearing face surfaces across the leakage path and towards a second one of the gas bearing face surfaces. A pull off biasing means is used for urging the inner and outer tooth rings axially away from the second one of the gas bearing face surfaces. The rotatable engine member may be a side plate mounted on a rotor disk and the non-rotatable engine member is mounted on a translatable piston axially movably supported on a stationary face seal support structure.

대표청구항 ▼

A gas turbine engine aspirating face seal includes a rotatable engine member and a non-rotatable engine member and a leakage path therebetween. Annular generally planar rotatable and non-rotatable gas bearing face surfaces circumscribed about a centerline are operably associated the rotatable and no

A gas turbine engine aspirating face seal includes a rotatable engine member and a non-rotatable engine member and a leakage path therebetween. Annular generally planar rotatable and non-rotatable gas bearing face surfaces circumscribed about a centerline are operably associated the rotatable and non-rotatable engine members respectively. Radially inner and outer tooth rings axially extend away from a first one of the rotatable and non-rotatable gas bearing face surfaces across the leakage path and towards a second one of the gas bearing face surfaces. A pull off biasing means is used for urging the inner and outer tooth rings axially away from the second one of the gas bearing face surfaces. The rotatable engine member may be a side plate mounted on a rotor disk and the non-rotatable engine member is mounted on a translatable piston axially movably supported on a stationary face seal support structure. said light guide plate is supplied with light from a primary light source having a plurality of point-like light emitters. 3. A light guide plate in accordance with claim 1, wherein said projections are configurated like quadrangle pyramids. 4. A surface light source device comprising: a primary light source having a point-like light emitter; and a light guide plate supplied with light from said primary light source, said light being introduced into said light guide plate through an incidence face and being emitted through an emission face, said light guide plate further having a back face opposite to said emission face, wherein said incidence face is located at a corner portion of said light guide plate so that light from said point-like light emitter is incident to said incidence face and said back face is provided with a great number of projections for light-advancing-direction-conversion, each of said projections including a pair of slopes formed so as to provide a ridge approaching said back face with an increasing distance from said incidence face, and said pairs of slopes providing valleys in said light guide plate, the valleys being orientated to be opened toward said corner portion as to convert light approaching thereto from said corner portion into light advancing toward said emission face. 5. A surface light source device in accordance with claim 4, wherein said primary light source has a plurality of point-like light emitters and light is supplied toward said incidence face from at least two point-like light emitters. 6. A surface light source device in accordance with claim 4, wherein said projections are configurated like quadrangle pyramids. 7. A display including a surface light source device to illuminate a liquid crystal display panel, said surface light source device comprising: a primary light source having a point-like light emitter; and a light guide plate supplied with light from said primary light source, said light being introduced into said light guide plate through an incidence face and being emitted through an emission face, said light guide plate further having a back face opposite to said emission face, wherein, said incidence face is located at a corner portion of said light guide plate so that light from said point-like light emitter is incident to said incidence face and said back face is provided with a great number of projections for light-advancing-direction-conversion, each of said projections including a pair of slopes formed so as to provide a ridge approaching said back face with an increasing distance from said incidence face, and said pairs of slopes providing valleys in said light guide plate, the valleys being orientated to be opened toward said corner portion as to convert light approaching thereto from said corner portion into light advancing toward said emission face. 8. A display in accordance with claim 7, wherein said primary light source has a plurality of point-like light emitters and light is supplied toward said incidence face from at least two point-like light emitters. 9. A display in accordance with claim 7, wherein said projections are configurated like quadrangle pyramids. negative terminal protruding from the switch assembly in a longitudinal direction at an upper end of the switch assembly, so that a negative current is transmitted to the spring from the power supply via the conductive case, the screw and the negative terminal. 2. A flashlight according to claim 1, wherein the switch assembly further includes a positive terminal which protrudes from a main body portion of the switch assembly. 3. A flashlight according to claim 1, wherein the spring is formed with a folded part at an end thereof, the folded part penetrating the circuit board. 4. A flashlight according to claim 1, wherein the bulb comprises a fluorescent substance applied to a glass portion thereof.