US431563A

US431563A - Dark-lantern

Info

Publication number: US431563A
Authority: US
Publication date: 1890-07-08
Anticipated expiration: 1907-07-08

Description

(No Model.)

0. H. DENISON.

' DABK LANTERN.

No. 431,563. Patented July 8, 1890.

UNITED STATES PATENT OFFICE.

CHARLES H. DENISON, OF SPRINGFIELD, MASSACHUSETTS.

DARK-LANTERN.

SPECIFICATION forming part of Letters Patent No: 431,563, dated July 8, 1 890.

Application filed JannaryQ, 1888. Serial No. 260.237. (N0 model.)

To all whom, it may concern:

Be it known that 1, CHARLES H. DENISON, of the city of Springfield, county of Hampden, State of Massachusetts, have invented Improvements in Dark-Lanterns, of which the following is a specification.

My invention consists in the combination, with the casing of a dark-lantern, of two screens, each supported by a rod having bearings in the vertical axis of the lantern, a handle for carrying the lantern, and a thumb-lever having one end in close proximity to said handle and the other end connected to the rods within said lantern, substantially as hereinafter described.

My invention further consists in certain combinations and sub-combinations to be hereinafter described.

In the accompanying drawings, Figure 1 is a cross-sectional View, in side elevation, of a lantern embodying my invention. Fig. 2 is a cross-sectional plan view of the same. Figs. 3 and 4 are views showing details of parts of same.

Referring to the drawings, the .casing A of the lantern is of well-known construction, provided with aventilating-hood, and having supports or handles h h and a lens B of ordinary bulls-eye form. Vithin said casin g is placed a wick-lamp L, secured to the casing by a screw and socket S, so that the wick will always be in a proper relation to the focus of the lens. The reflector R, which is curved and located to concentrate the reflected light also in the focus of the lens, is rigidly secured to the casing. Suitable air-space is provided under and around the lamp L, and the top of the lamp-reservoir is shown depressed to catch any overflow of oil and allow it to run back into the reservoir. \Vithin the structure thus formedI mountthe screens C C, soldered upon the pivoted arms a a. Said arms a a, carry ing screens 0 C, are pivoted on rods or wires 9 p, which move in the support 6, and are supported and held in proper upright position by passing up through the hood of the casing. Hooks r 0 connect between the arms a a and the cross-wire w, to which is attached a leverlike projection-D, which has its fulcrum at ff and extends upward between the handles it h by which the structure is held or carried.

The operation of the screen-moving mech anism is as follows: The screens 0 0 being in the. position shown, by depressing the latch or lever-like proj ect-ion D with the thumb the screens 0 O are quickly brought together at the point X opposite the center of the lens. To withdraw the screens to the position shown, the lever-like projection D is lifted to the position shown. As there 'is no spring to operate the lever-like project-ion D, it will remain in the position into which it is thrown. this construction of the screen each half passes through a limited space, moves easily and quickly, and can be partially opened with good effect, as the light from the partiallyopened screen is at the focus of the lens. To completely close the screens, they are adapted to slightly lap by each other. To allow a concentrated focused light to escape between the screens, I cut a semicircular notch in each, so that when brought together and not lapped there will be a round hole at X in line with the flame ofthe lamp and the focus of the cal axis of the lantern, one or more handles it, attached to the lantern, and a pivoted lever having one end in close proximity to the supporting-handle and the other end connected to the crank-rods, substantially as described.

CHAS. H. DENISON. WVitnesses:

JOSEPH W. BUELL, JOHN PETTIGREW.