US2213880A

US2213880A - Safety lamp

Info

Publication number: US2213880A
Authority: US
Inventors: Baudilio Jesus Pique Y Giroud
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-10-24
Filing date: 1938-10-24
Publication date: 1940-09-03
Anticipated expiration: 1957-09-03

Description

3- Sheets-Sheet 1 SAFETY LAMP Sept- 3, 1940 lla. J. PIQUE Y GlRouD Filed oct. 24, 195s u S NN N a m. a.

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SAFETY LAMP Filed Oct. '24, 1938 3 Sheets-'Sheet 2 n lo irw Inventor Sept. 3, 1940. B. J. PlQuE Y GIROUD SAFETY LAMP Filed Oct. 24, 1938 3 Sheets-Sheet I5 Patented Sept. 3, 1940 UNITED STATES SAFETY LAlVIP Baudilio Jesus Piqu y Giroud, Marianao Township, ,Cuba

Application October 24, 1938, Serial No. 236,674

2 clams.

My invention relates to Safety lamp for use in connection with automobiles, airdromes, and other objects.

The object of my invention is to provide a headlight adapted to emit a compound beam of light comprising a true beam of horizontal rays and a fan oi downward deflected rays at different angles.

Another object is to afford means to cut ofl the horizontally projected beam of light without impairing those rays projected downwardly.

Another object is to provide means to avoid the projection of those rays extending upward from the horizontal.

Another object is to aiford means for lessening the intensity of the projected light when the horizontally cast beam is cut off.

I attain these objects by the combination and arrangement of parts illustrated in the accompanying drawings, in which:

Fig. 1 is a longitudinal vertical section or a lamp body, showing the combination of the upper half of a paraboloidal reflector provided with a source of light at its focus, a rotatable hemispherical shell adapted to take the position indicated by broken lines, a lattice of plane plates parallel to the base of the lamp body, and the upper half of a plano-cylindrical lens.

Fig. 2 is a cross-s'ection on the line 2 2 in Fig. 1, showing the device for cutting off, from the light cast by the lamp, the beam of rays horizontally projected.

Fig. 3 is a front view of the lamp.

Fig. 4 is a cross-section on the line ll-i in Fig. 1.

Fig. 5 is a horizontal cross section on line 5-5 in Fig. l.

Similar numerals refer to throughout the several gures.

Referring to the drawings, numeral I is used to designate a lamp body, made of metal or any other suitable strong material, whose inner surface from the vertex a to point b has the shape of the upper half of a paraboloid, and from point b`to point c it makes another kind of curve surface.

The rear end of the lamp body I abuts on an annexed box 2 which comprises an upper horizontal plate 3 provided with a hemispherical depression 4 whose center S coincides with the focus of the lamp body half paraboloid. Said depression 4 houses a socket 5 adapted to receive a light bulb whose lament will coincide with the point 6, as shown in Figs. 1, 2 and 5. The lateral edges of the plate 3 are prolonged downwardly to form similar parts (Cl. W-41.3)

the walls 23, to which is secured a lid 22 that closes the bottom of box 2.

The inner edge of the lower borders of the lamp body l is provided with a rabbet 8, Fig. 4, adapted to receive the lateral borders of the base l which is held therein by screws or clamps and whose rear end rests on the plate 3, so that its edge 9 serves as a screen to impede the direct rays from the light bulb at 6 to be projected out, Figs. 1 and 2.

A number of horizontal plates I0, pierced by vertical rods I I, fastened on the base 'I and other rods l2 that join the contour of the group of said horizontal plates it, make a compact frame proper, on account of its shape, to t well within the paraboloid of the lamp body l. Those horizontal plates lli, constitute a fixed lattice adapted to intercept the rays oi light projected by the reflector at an angle upward from the horizontal greater than the inclination of a straight line passing between two consecutive plates touching the inner edge of the lower one and the outer edge of the upper one. Therefore, the spacing of said horizontal plates must be regulated in rela# tion to their lengths.

The inner border of the front of the lamp body I, is provided with a slot I3 which becomes wider downwards in both sides and it is adapted to receive and house theedge of the upper half of a plano-cylindrical lens I4 whose base-Which is rectangular-will rest in a rabbet l5, cut in. the edge of the front of the base l. The plane face of the lens l is placed inwardly and at right angle to the plates I0, Fig. l.

A hemispherical shell It, concentric with the hemispherical depression 4, has a slot whereby a socket 5, passes and said shell I6, is provided with two axles Il and Ila Whose ends are adapted to turn in proper bearings made in the lamp body I, Figs. 2 and 3.

An arm i8 attached to the axle Il, passes through a slot cut in the plate 3 and it has its lower end connected to a flexible rod I9 which comes from the exterior through a suitable housing, so that when said flexible rod I9 is pulled it pulls the end of the arm I8 causing the axle Il to turn with the shell It into the position shown by broken lines in Fig. 1. And vice versa, when the flexible rod I9 is pushed, it pushes the end of the arm I8 causing the axle il to turn back with the shell` IB into the position shown by heavy lines in Fig, 1.

An arm 2l) attached to the axle Ila passes through a slot made in the plate 3 and carries on its end a contact adapted to operate a rheostat 2| which regulates the electric current and therefore the intensity of the light emitted` by the bulb at 6.

The inner surfaces of the lamp body I, and the inner surface of the shell I6 as well as the lower faces of the plates I are polished, in order to reect the light While the surfaces of the upper faces of the plates III, the plate 3 and the base l are porous, dull and Without any luster so that they may not reect any. light. l

The front elevation of the lens I4 is semicircular, as shown in Fig. 3, while any vertical section of the same at right angle to its plane face will be the upper half of a circular segment,

because, as shown in Fig. 1, said lens It is the upper half of a plano-cylindrical lens having its generator line horizontal and parallel to its plane face.

With this disposition of the lens I @when a beam of horizontal rays of light falls normally von its plane face, those rays, passing through the lower third of the lens, do not suffer any appreciable refraction, because they meet nor mally the front face oi the lens, as it is shown by a broken line in Fig. l; while else rays passing through the lens higher than its lower third `will meet its front cylindrical face leaning backwardly and as they are passing into the air,`

which is optically a rarer medium than the lens,.

they willl be refracted from the normal .to the curved surface. Then 4the deflection will be downwardly, and greater as the rays pass higher through the lens I4. by the uppermost portion of said lens are those which illuminate theA roadway immediately in front of the Vehicle.

Now, when the flexible rod I il is pulled and v it pulls the end of the arm i3, as herein before described; the shell I 6 turns into the position shown by broken lines in Fig. 1 and interceptsv In this way the rays castV fore, the suppressible far reaching horizontal beam of rays of the compound beam of light cast by the lamp is also cut olf. Meantime, the arm 20' will have turned carrying its contact against the rheostat 2| diminishing the intensity of the remaining light projected by the lamp to the standard allowed for city use.

I claim: y

1. In a safety lamp, the combination of the upper half of a paraboloidal reflector provided with a source of light at its focus; a rotatable hemispherical shell whose center coincides with the focus of the above named paraboloidal reflector; means to rotate said hemispherical shell into a position proper to impede the light from the focus to fall on a portion of the reflector comprising from its Vertex to the parameter or thereabout; a number of long horizontal parallel plates spaced in relation to their lengths; and the upper half of a plano-cylindrical lens placed with its-plane face toward the reflector and -at right angle to the above named horizontal plates.

2. In a safety lamp, the combination of an upper half of a paraboloidal reflector provided with a source of light at its focus; a number of long horizontal parallel plates spaced in relation to their lengths; an upper half of a plano-` cylindrical lens; a hemispherical shell, adapted to fulfil two functions, one as a screen, and the other as a reflector whose center coincides with the above-named focus of the paraboloidal reilector and the source of light; means to rotate said hemispherical shell into two positions, o-ne interposed between the source of light and a portion of the paraboloidal reflector comprised from its Vertex to the parameter or thereabout, and the other position at the side of the source of lightv opposite to the paraboloidal reflector; and a rheostat which regulates the electric current and therefore the intensity of the light emitted by the source of light, acted by the saine means which cau-ses the hemispherical shell to rotate.

BAUDILIO JESUS PIQU Y GIROUD.