US 3660839 A
An annunciator lamp block which includes a color filter laminated thereto, indicia markings on said filter, one or more lamps within the lamp block, and spring contacts between the lamps and the annunciator circuit.
Description (OCR text may contain errors)
United States Patent Wittman et a].
[ 51 May 2,1972
REMOVABLE ANNUNCIATOR LAMP BLOCK Inventors: Samuel Wittm'an; Marcel Wittman, both of Lake Drive, Bethlehem, Conn. 06751 Filed: Oct. 16, 1970 Appl. No.: 81,490
A Related US. Application Data Continuation of Ser. N0. 726,916, May 6, I968, aban doned.
US. Cl ..340/38l, 340/366 Int. Cl. ..G08b 5/00 Field of Search "340/381 lllll I/Ill xx azam  References Cited UNITED s'mres PATENTS 2,703,398 3/1955 Harrington .....34o/3s 1 Primary Examiner-Harold l. Pitts Attorney-Stall and Stoll  ABSTRACT An annunciator lamp block which includes a color filter laminated thereto, indicia markings on said filter, one or more lamps within the lamp block, and spring contacts between the lamps and the annunciator circuit.
5 Claims, Drawing Figures REMOVABLE ANNUNCIATOR LAMP BLOCK REFERENCE TO RELATED MATERIAL plication Ser. No. 726,752, filed May 6, 1968 and entitled Annunciator. I
BACKGROUND OF THE INVENTION Name Number Date Grimes 2,340,053 Jan. 25, I944 Noyes 2,916,725 Dec. I8, 1959 Noyes 2,925,592 Feb. 16, I960 Arrasmith 3,l07,350 Oct. l5, I963v Parsons 3,139,6l6 June 30, I964 Harrington 3,241,136 Mar. 15, I966 SUMMARY OF THE INVENTION The invention comprises a lamp block for multiple signal annunciators, said lamp block containing one or more lamps and having a color filter laminated thereto as one wall thereof, with indicia markings on said filter, made visible to the eye when the lamp or lamps are lit.
In one form of the invention, the lamp or lamps are permanently encased within the block. In another form of the invention, they are removable therefrom.
In either case, the same blocks may be used for different signals having different color requirements, by the simple expedient of laminating thereto appropriate color filters, e.g., color filters transmitting aviation yellow (amber), green,.blue and red light.
Trunions are provided on the sides of the lamp blocks to enable them to pivot toward and away from a printed circuit through which they may be connected tothe various operating and control systems which they are intended to monitor. Leaf spring contacts between the lamp blocks and the printed circuit serve to connect the lamps to the circuit and they also function as mechanical biasing means to pivot the lamp blocks into accessible positions away from the printed circuit for removal.
BRIEF DESCRIPTION OF TI'IIF. DRAWING FIG. 1 is a side view of a lamp 'block made in accordance with one form of the invention, wherein the lamps are not removable.
FIG. 2 is a view of the back of the lamp block, showing its leaf spring contact members.
FIG. 3 is an inside view of the lamp block, looking in the direction of arrows 3-3 of FIG. 1.
FIG. 4 is a longitudinal section on the line 4-4 of FIG. 2.
FIG. 5 is a transverse section on the line 5-5 of FIG. 4.
FIG. 6 is a longitudinal section on the line 6--6 of FIG. 4.
FIG. 7 is a side view of a lamp blockmade in accordance with a second form of this invention, wherein the lamps are removable.
FIG. 8 is an end view of said lamp block.
FIG. 9 is a longitudinal section on the line 9-9 ofFIG. 7. FIG. 10 is a longitudinal section'on the line 10-10 of FIG. 8.
FIG. 11 is a face view of a lamp block made in accordance with a third form of the invention.
FIG. 12 is a back view thereof, showing its leaf spring contact members. FIG. 13 is a longitudinal section on the line 13-13 of FIG. 11.
FIG. 14 is an enlarged sectional view through the color filter component of the lamp block shown in FIGS. 1143.
DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Lamp block 10 made in accordance with the first form of this invention (FIGS. 1-6) comprises a housing 12, a base14 providing a back wall for the casing, a color filter I6 providing a front wall for the casing, one or more miniature, high intensity lamps 18 within the casing, and a pair of contact members 20 serving as conductors between the lamps and the annunciator circuit. Such circuit is shown in the form of a printed circuit on the annunciator base in the drawing of our co-pending U.S. Pat, application Ser. No. 726,752, filed May 6, I968.
The casing 12 is a plastic block (see FIG. 6) having one or more cylindrical chambers 22 formedtherein to receive and accommodate the lamps. In the illustrated form of this embodiment of the invention, three chambers 22 are provided to accommodate three lamps. These lamps are connected in parallel to conductors 24 and 26 which support them on base 14. Conductors 24 and 26 are connected to spring contacts 20 through'holes formed in the base and thereby connect the lamps to said contacts and to the circuits which the contacts engage.
Base 14 is also made of a plastic material and it is cemented or heat sealed to the back of casing 12, thereby closing the back of the casing and sealing it against moisture and foreign matter. Cemented or heat sealed to the front of the casing is color filter 16 which is also a plastic element. The color filter closes the front of the casing and seals it against moisture and foreign matter. The lamps and their conductors and all inner connections are thereby protected within the casing.
Illustrative of materials used for the plastic components of the lamp block (casing, base and color filter) are such thermoplastics as the polycarbonates (bisphenol-a) and the acrylic resins (methyl-methacrylates).Other thermoplastic compositions, as well as thermosetting resins may be used for the lamp block components. However, the color filter must, of course, be light transmitting, either transparent or translucent, and the preferred materials are Plexiglas of Rohm and Haas Company of Philadelphia, Pennsylvania (acrylate and methacrylate resin) and Lexan of General Electric Company of Scheneccoating 32 which is black and opaque. Other colors also may be used. Both coatings cover the entire block, the color filter, casing and base alike.
A suitable legend 34 may be inscribed upon the face of the color filter (as shown in FIGS. 11 and I4) and this may be done by various means and methods, e.g., mechanical engraving, chemical engraving or etching, and the like. These methods involve removal of the outer opaque coating in the legend areas,'leaving the translucent undercoating intact.
any of the signalling purposes of annunciator systems, requiring only that appropriate color filters be utilizedto provide the color signals desired, and that appropriate legends be applied.
- Trunions 36 pivotally support the lamp block in the annunciasame chamber 4,4-while lamps l8 occupy separate chambers More specifically, .lamp block 40 comprises a casing, a base plate 48 and a color filter 50, both adhesively secured or heat welded or otherwise joined to the casing to form a closed housing for the lamps. Open end holes-52 are formed in the end walls of casing 46 through which lamps 42 may be inserted into chamber 44. Sleeves 54 are fixed within said holes to serve as socketsfor the lamp bases 56. Flanges 58 on said lamp bases abut sleeves 54 to limit inward movement of the lamps, while pivoted locking bars 60 on the end walls of the lamp block engage the lamp terminals and. lock the lamps in place. To remove the lamps, said locking bars are swung away from the lamp terminals and the lamps are withdrawn from their respective sockets.
Locking bars 60 also ser've as conductors connecting the lamp terminals to one spring contact member 62. Pins 64 and conductors 66 are included in the circuit. Conductors 68 connect thesleeves 54, and hence the lamp bases 56, to the other spring 'contact member 62. By this means, the'lamps are connected in parallel to the printed circuit base of the annunciator, as illustrated in our co-pending patent application.
As in the case of the first lamp blockabove described, lamp block 40 is coated with an undercoating70 which is translucent and an outercoating 72 which is opaque. A legend is applied to the color filter by the means and methods above described, e.g., by chemically or mechanically inscribing the legend in the outer coating covering the face of the color filter. Similarly, lamp block 40 is provided with trunions 74 on its side walls-for pivotal mounting in the casing of a multiple compartmented annunciator as shown in ourv co-pending patent application. v
Referring now to the third form of this invention (FIGS. 11-14), lamp block 8Qresembles lamp block 40 in essential details, except that its lamps 82 areinounted on base plate 84 rather than on the end walls ofthercasing. As in lamp block 40, the lamps of lamp block80 projectinto a'single chamber 86. The bases of the lamps are set' into receptacles 88 which are fixed in openings formed in the base. A single locking bar 90, swivelly mounted on the base by means of a centrally disposed pin 92, looks the lamps in place. To remove and replace the lamps, the locking bar is pivoted out of engagement with the lamps and the lamps may then readily be removed from their respective receptacles.
It will be noted in FlGS..12 and l3that the locking bar'also serves as a conductor, being in contact with the lamp terminals and being connected to spring contact 94 by means of conductor 96. The lamp sockets are connected to the otherv spring contact 98 by means of receptacles 88 and-conductors 100 and 102. The lamps are accordingly connected in parallel to the printed circuit which the spring contacts engage, as shown in our co-pending patent application.
Lamp block 80, like lamp blocks and 40, is provided with a casing, a base and a color filter. Casing 104 is mounted on and secured'to base 106, and the color filter 108 is mounted on and secured to the casing. in lamp block 80, the base may be made of an opaque, thermosetting plastic, such as Bakelite, a phenolformaldehyde resin made by the Bakelite Company, a
' division of Union Carbide and'Carbon Corporation of New York, New York. Since this base does not transmit light, there is no need to coat it with an opaque coating. Consequently, the two coatings above mentioned, a translucent undercoating 30 and an opaque outer coating 32 need be applied only to the coating to expose the translucent undercoating and thereby form a legend 34.
When used in an annunciator of the type shown in our copending patent- .application, lamp block 80 is pivotally mounted therein, and this may be done by means of trunions 110 formed on casing 104 and engaging bayonet slots in the walls of the annunciator.
The foregoing embodiments are intended to illustrate, not I limit, the invention. These embodiments may be modified, and
variations may be had, within the broad scope of the appended claims. For example, the undercoating (a translucent paint) is not an essential or critical element of the claimed combination. It is used to diffuse the light which passes through the color filter when the lamps are energized, and to blend the legend into the background whenthe lamps are not energized. The translucent undercoating may be omitted to permit unobstructed transmission of light through the legend areas of the color filter. Moreover, when the translucent undercoating is used, it need not coat the entire lamp block. Its function is perwherein:
formed only in the legend areas. A converse arrangement is also feasible, wherein the legend is coated with opaque paint and the areas surrounding the legend are free of opaque paint. Light would be transmitted through the surrounding areas and the legend would be made visible in profile in the form of dark lettering against a lighted background.
What is claimed is: i
1. An annunciator. lamp block, comprising:
a. a casing, said casing comprising a base, a pair of opposed side walls, a pair of opposed end walls and a front wall;
b. a color filter forming said front wall of the casing;
c. at least one lamp within the casing; v
d. a legend formed on said color filter for illumination by light transmitted by the lamp through the color filter;
e. a pair of spring contact members being mounted on said base; a
f. at least one pivoted locking bar hingedly secured to said casing, engaging at least one of said lamps and locking the lamp in place within said casing;
g. said lamps being connected by way of said pivoted locking bars to said contact members and said contact members being adapted for connection to a power source;'and v 1 1 h. said side walls each being pivoted'with an outwardly extending pivot trunion, said' pivot trunions permitting said lamp block to pivot about an axis defined by said pivot trunions. j
2. An annunciator lamp block in accordance with claim 1,
a. the color filter is covered with an opaque coating except in the areas comprising the legend;
b. said legend areas being covered with a light-transmitting coating. i
3. An annunciator lamp block in accordance with claim 1,
a. the color filter is covered with a light-transmitting'coating except in the areas comprising the legendj b. said legend areas being covered with an opaque coating.
4. An annunciator lamp block in accordance with claim 1,
5; An annunciator lamp block in accordance with claim 1, wherein:
said pivoted locking bar is pivoted substantially at its center, the outer portions thereof being engagable with a pair of said lamps.
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