摘要:
A pre-gapped breaker point assembly for use with distributors of internal combustion engines including a contact arm, with a cam follower and breaker contact points, adapted for reciprocatory movement in consonance with the cam follower, and a novel spacing block, adapted to make contact with the distributor cam lobes, thereby establishing the distance the movable contact point separates from the stationary contact point in response to the rotating cam lobes moving the cam follower.
摘要:
A support frame for solid screen or flexible sheet panel material comprising an originally elongated strip which includes a hem edge having a substantially hemispherical button tip configuration defined by a fold substantially located along the longitudinal axis of the strip. A plurality of pairs of slots having a T-shaped configuration are formed in the strip such that the strip may be turned at these points and thereby define corners of a polygon engaging the material about its periphery and providing support therefor. Hooks, serving as material connecting means; hinges, used to pivotally attach the frame; and clips used for closure means are all integrally formed in the strip and protrude from predetermined sides of the surface thereof in order to secure the material to the frame or mount the frame itself respectively.
摘要:
A needleless hypodermic injector including a medicament containing ampule, a container of pressurized gas and a connection operatively coupling the gas to the ampule to pressurize the medicament for discharge. The ampule includes at least one rigid end wall which is provided with an opening therein which serves as a discharge orifice through which the pressurized medicament is discharged in the form of a high pressure injection stream. The opposite end of the ampule is configured to permit the medicament to be rapidly pressurized by the gas.
摘要:
A device secured between a towing vehicle and a towed vehicle for reducing sway of the towed vehicle during travel. A rod member connected with one of the vehicles and having a piston head at the outer end thereof disposed within a hydraulic cylinder connected with the other vehicle. The travel of the piston in the hydraulic cylinder is controlled or retarded for controlling relative swaying movement between the vehicles.
摘要:
An electronically controllable RF (radio frequency) phase shifter that can be designed to provide either true time delay characteristics or constant phase versus frequency characteristics. The non-reciprocal microstrip phase shifters of the invention utilize a ferrimagnetic substrate with a metallized strip conductor on one face and a metallized ground plane on the other face. The strip conductor has a plurality of adjacent line sections selected to provide a circularly polarized RF magnetic field at a point between each two adjacent conductors with the plane of the circularly polarized magnetic field being orthogonal to the plane of a DC magnetic bias field, the latter plane being provided parallel to the face of the substrate. The circularly polarized RF magnetic field is developed by selecting the line sections with a length so that the signals in adjacent lines are 90* out of phase from each other. When either the level or direction of the DC bias is changed, the permeability of the ferrimagnetic material changes causing a change in the propagation constant and a resultant phase shift change. To provide a relatively wide bandwidth to the phase shifter and a desired delay characteristic, the adjacent conductor sections have their line length varied so that different portions of the line effects the phase shift for different frequencies.
摘要:
The provision of a planetarium projector provided with a nearpoint light source for the projection of the star images and including means for mounting, and maintaining, a star projection sphere concentric with the underside of a hemispherical dome within which the projector means is operatively positioned, to provide a highly realistic, accurate reproduction of the heavens as they appear from a given observation point upon the surface of the earth. The planetarium projector means also includes optical projection means for the sun, moon and planets which includes means for eliminating parallax from these projectors due to their somewhat non-concentric placement relative to the projection dome. Still further, the utilization of a point light source provided with means for decreasing the intensity of the lamp toward that portion thereof responsible for the projection of the fixed star images in the equatorial regions of the projection dome provides a unique method of presenting a planetarium display characterized by a high degree of realism in the projected night sky.