US2668903A

US2668903A - Auxiliary lamp snap-on filter

Info

Publication number: US2668903A
Application number: US104656A
Authority: US
Inventors: Edward L Barcus
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1949-07-14
Filing date: 1949-07-14
Publication date: 1954-02-09
Anticipated expiration: 1971-02-09

Description

Feb 9, 1954 E. I .BARcUs AUXILI'ARY LAMP SNAP-0N FILTER Filed July 14, 1949 Inventor afa/mu@ gaz/:as

Patented Feb. 9, 1954 AUXILIARY LAMP SNAP-ON FILTER Edward L. -Barons, Andersonflnd., assigner to General Motors Corporation,V DetroitfMich., a

corporation of Delaware Application July 14, 1949, Serial No. 104,656

1 Claim.

The present invention relates to vehicle auxiliary lamps of the type illustrated and described in the U. S. application of Clarence A. Michel, et al., Serial Number 32,654, led June l2, 1948, and more particularly to snap-on iilters for such lamps.

rIhe auxiliary lamp of the above application comprises a well-known sealed-beam lamp and a simple adapter for connecting the lamp in a vehicle lighting system. It provides a simple and inexpensive trouble light for vehicles particularly trucks which are used in scheduled runs requiring large amounts of driving during the hours of darkness. Such vehicles are often subjected to breakdowns on the highways and require suitable portable lighting systems for effecting repairs and in addition require suitable means for giving ample warning to other highway trafc. Heretofore, open flame kerosene lamps having windshields have been used but are not entirely successful as they are bulky and require frequent attention to keep them in condition. The portable lamp of the above application obviates the need for frequent attention and may be quickly and easily converted to a warning lamp.

It is therefore an object of the present invention to provide a filter for the above adapted to quickly convert it to a warning signal means.

This and other objects are accomplished in accordance with the present invention by providing the portable lamp disclosed in the above application with a colored lter element readily attached thereto.

The novel features which are characteristic of my invention are set forth with particularity in the appended claim. The invention itself, however, will be best understood in connection with the accompanying drawing in which Figure l is a side elevational view of the portable lamp and snap-on filter and Figure 2 is a perspective view of the filter.

Referring now to the drawing there is illustrated the portable lamp with the filter attached for use as a portable warning lamp. The lamp comprises a conventional sealed beam lamp 2 composed of a light source (not shown), a reiiector 4 and a lens 6 sealed as a unit by the sealing ring 8. An adapter I composed of a cupshaped spool member I2, a connector I4 and a rectangular plate IB (shown partly broken away) provides means for connecting the sealed-beam lamp to the lighting circuit of the vehicle by conductors I8. When the terminals (not shown) of the sealed beam lamp are inserted in the connector I4, the reflector 4 forms one side for the spool I2 thus permitting the winding of a length of conductor I8 on the spool. A pair of spring clamps 20 having one end connected to the side Wall of the spool as shown and the other end engaging the sealing ring 8 provide for clamping the sealed beam lamp in the adapter.

To convert the portable trouble lamp into a warning lamp a snap-on filter 22 is provided. The lter is formed with inner and outer spherical surfaces 24 and 26 respectively which substantially conforms to the outer surface contour of lens 6. The lter is made of any suitable transparent material preferably a plastic which is colored red to filter substantially all but red light from the light source thus providing the conventional red warning signal. I have found that a plastic material such as the polymerized methylmethacrylate thermoplastic resin commonly known as Lucite is particularly desirable. The filter 22 is provided with diametrically disposed axially extending Iianges 28 which engage the surface of the sealing ring 8 of the sealed-beam lamp. Cutout portions 30 equally space the anges 28 and adapt the lter to be fastened with the portable bracket described in the above application. Centrally spaced along the anges 28 and at the peripheral edge of the iilter are rectangular apertures 32 which provide for attaching the lter element to the portable lamp by means of the spring clamps 20. It will be seen that attachment of the lter element is accomplished by first removing the clamps from their position engaging the sealing ring of the sealedbeam lamp, sliding the filter element over the sealed-beam lamp and thereafter inserting the gripping ends of the clamps 20 through the apertures 32 to again engage the sealing ring.

With the lter element attached the auxiliary lamp provides a warning signal lamp which is compact for carrying at some convenient place on the vehicle, and portable with the extension cord to position the lamp at suitable positions ahead of or behind the vehicle for a warning signal.

What I claim as new and desire to secure by Letters Patent of the United States is:

In combination with a vehicle auxiliary trouble lamp comprising a sealed-beam unit, an adapter for connecting said unit in the electrical system of said vehicle, said adapter comprising a cupshaped spool member, an electrical connector, and a plate member, and means for clamping said sealed-beam unit in said adapter, said means comprising a pair of spring clamps each detachforming to the contour of the outer lens surfaceV of the sealed-beam unit, and having a pair of diametrically disposed axially extending integral flanges fmled atgthedge of sadfilterforv engaging the peripheral vedge ofsa-idL sealed-beam unit and positioning said lter thereon, said lter additionally having disposed centrally of said-l flanges to rectangular apertures through: Which said spring clamps grip the sealed-beam unit.

ARCUS,

4 References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 422,592 Holman Mar. 4, 1890 1,781,865 Aniol Nov. 18, 1930 2,153,100 Romanik. f f Apr,v 4, 1939 2,158,121' Hirschbergl May"16, 1939 2,277,147 Rogers Mar. 24, 1942 OTHER REFERENCES DuvvPo'nt,J-; Ind. & Eng. Chem., October 1936, page 1162. (Copyy in Scientific Library).