US1446248A - Searchlight - Google Patents

Description

Feb. 20, 1923 D. FOSTER ET AL.

SEARGHLIGHT.

Aman FEB. zo. 1920.

f alla v. mmf/M WM T0106 R mf m M w Patented Feb. 20, 1923.

UNITED STATES 1,446,248 Parar ortica.

SEARCHLIGHT.

Application filed February 2Q, 1920. Serial No. 360,213.

To @ZZ wlw/1n t may concern.' l

Be it known that we, DoNovAN- Fosrur. and LEROY L. MIDDELKAMP, citizens of the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful lmprovements in Searchlights, of which the following is a specification.

This invention relates to search-lights and more especially to apparatus of this character which are employed upon pilot-houses of marine vessels to facilitate making landings at docks, etc.

rlhe object of our invention is the provision of a search-light provided with devices to enable the search-light to produce selectively a concentrated beam or a diverging beam through the instrumentality vof means which are manually actuated as, for ex7 ample, from the interior of a pilot house.

The invention consists in the novel construction and combination of devices for regulating the position of the source of light with respect to the lens of a searchlight.

1n the accompanying drawing,

Figure 1 is a longitudinal vertical elevation of asearch-light embodying the present invention shown applied.

Fig. 2 is a transverse vertical sectional view through 2--2 of Fig. 1. Fig. 3 is a horizontal sectional view through the lamp casing shown in the preceding views, the light bulb being omitted.

Fig. 4 is a detail sectional view through t-t of Fig. 1.

Referring to the drawings, 5 is the casing of a search-light provided at its front with converging lens 6.

The rear end 7 of the casing is made re-` movable to afford access to the interior'. tending from diametrically opposite sides of the casing are trunnions 8 which are journaled in bearings providedr in the bifurcations 9 of a vertical post 10 which is supported by and rotatable in a hollow stand 11 which is secured to a pilot house roof which is indicated by 12.

Secured to the trunnions 8 are forwardly extending arms 13 which are connected to the branches 14 of a forked member l5 which, in turn, is connected to an arm 16 of a tubular controlling rod 17 which extends downwardly through the stand 11 into thepilot house. 18 represents a hand wheel provided on the lower` end of the rod 17 whereby the latter may be rotated by the pilot to correspondingly turn the search-light. Said wheel is also utilized to elevate or lower the rod 17 which, acting throughthe medium of member 15 and arms 13, serve to regulate the casing axis with respect to a. horizontal plane.

The above described devices have beenk is journaled at its ends in the bloc-ks 23 and engages in a nut 241 depending from the carriage so that when the screw is turned in one rotary direction or the other the carriage is `respectively advanced toward or retracted from the front of the casing.

To effect such rotary movements of the carriage actuating screw we preferably use two cords and 26 wound in reverse directions about the screw and thence extending through the controlling rod 17 into the pilot house as at 251 and 261.

For convenienceof the operator in selectively using said cords the saine have desirably attached thereto, diiferentshaped bodies as, for example, a cube 252 and ball 262 tobe readily distinguishable in the dark by touch.

27 represents an incandescent lamp bulb having circuit wires 28 extending as through the'rod 17 to a source of electric energy.

For the purpose of regulating the source of light to be located in the focal axis of the lens the lamp bulb is adjustable vertically as by means of a wedge .or cam shaped socket 30 and a flanged ring 31 surrounding the socket extension 301 and secured to the carriage. f

32 represents a reflector' disposed to the rear of the source of light and is connected to a standard 33 which, in turn, is con nected for horizontal adjustments to a bracket arm 34: arranged for vertical and rotary movements upon a post 35 which is secured to the rear end of the carriage.

The rear end of the casing is removed for regulating` the relative positions or", the lamp bulb and the reflector.

To effectthe coincident movements or the lamp bulb and the reflector toward or from the lens 6 the operator exercises a pull upon the cord ends Q51 or 9.6"A which will suitably rotate the screw 24 to impart the desired movement to the carriage upon which the bulb zand reflector are mounted. y y

VhenV the source of light as represented by the filament A is in approximately the position in which it is illustrated by full lines in F 1, the light rays which are effective with respect to the lens, will be within the angle between the dotted lines a, a and such rays passingv through the lens are delivered` in a concentrated beam included between `the dotted linesol, @5.1.

By advancing the carriage toward the lens,rhowever, to position the source of light at B, 'for example, the eifective light` rays, with respect to the lens, will be within the angle of the dotted lines Z), 7) and which in passing` through the lens are retracted to extend as denoted by b1, b1 outside of the referred to concentrated beam with a diverging beam.

That we claim, is-

ln a searchlight, the combination with a casing having` a lens` at the front end thereoli, a stationary stand, a hollow postinounted in said stand and serving as a support for the casing, said post serving, as a verticaly pivot for the casing, and horizontal pivot connections for the casing,` carried by said post, of a carriage provided .in the casing,` for longitudinal movements relative thereto, an electric lamp and a reflector mounted on said carriage, devices provided in the casing,` and operatively connected with said carriage for effecting travel to the latter, means extending; through said post for rotatably moving` said casing` about the axes of both the vertical and horizontal pivot connections therefor, and means extending through said post for actuating said devices to cause the carriage to convey the lamp and reflector toward or Jfrom said lens.

Signed at Seattle, Vilashington, this 11th day et February, 1920.

DONOVAN FOSTER. l LEROY L. MIDDELKABHD. vlfllitnesse.

' Pinnen BARNES,

y llLi'zfmnfrn JOHNSON.

Images