US 3256466 A
Description (OCR text may contain errors)
June 14, 1966 A. E. TROLIO ETAL 3,256,466
SOCKET INSERT FOR VARYING THE INTENSITY OF A LIGHT BULB Filed Oct. 12, 1962 INVENTORS ANDREW E. TROL/O BY BOYCE M. AOAMS ATTORNEYS.
M W W United States Patent 3,256,466 SOCKET INSERT FOR VARYING THE INTENSITY OF A LIGHT BULB Andrew E. Trolio, Broomall, Pa., and Boyce M. Adams, Moorestown, N .J., assignors to Adtrol Electronics, Inc., Philadelphia, Pa., a corporation of Pennsylvania Filed Oct. 12, 1962, Ser. No. 230,070 1 Claim. (Cl. 317-101) This invention relates to a socket insert for varying the intensity of a light bulb and has as its principal objective the provision of a disc of economical construction whlch may be placed in a light bulb socket having a four position (ofi, high, medium and low) switch associated therewith. A standard one or two filament light blub may be then screwed in the light socket to contact the insert. In one position of the switch the single filament bulb will be excited to full intensity. In a second position of the switch the bulb will be excited to essentially one-half of its full intensity. A two filament bulb may be employed in a similar manner with the respective filaments being excited in accordance with the particular position of the switch.
, It is known to provide a so-called three way light bulb which may be secured in a socket having a four position switch associated therewith. Such a three way light bulb generally possesses two filaments wherebyvarying light intensities may be achieved depending upon the position of the switch. However, such bulbs are relatively expensive and of a relatively short life.
It is, accordingly, a principal object of the present invention to provide a socket insert for such a switch whereby a conventional light bulb may be employed to achieve two levels of light intensity.
The foregoing as well as other objects of the present invention are achieved by providing a socket insert for a socket having a four position switch associated there with. The socket insert is a separable insulating disc having first and second disc terminals secured thereon and further having a half-wave rectifier physically and electrically united to the disc terminals. The first disc terminal is positioned on both sides of the disc so that it may contact a first terminal of the socket. The disc fur ther includes a slot adjacent the second disc terminal to permit a second socket terminal to project therethrough and contact the second disc terminal. The terminal of the blub will contact the first disc terminal so that in one position of the switch a conventional circuit is made through the light bulb which Will burn with full intensity. In a second position of the switch, the half-wave rectifier is introduced into the light bulb circuit so that the light bulb will burn with substantially one-half of its normal intensity.
Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
FIG. 1 is an exploded perspective view with portions cut away for clarity showing a socket insert of the present invention about to be placed in a socket having associated therewith a three position switch;
FIG. 2 is a top plan view of a socket insert of FIG. 1;
FIG. 3 is a bottom plan view of the socket insert of FIG. 2;
FIG. .4 is an enlarged sectional view taken along the lines.44 of FIG. 1 showing the insert placed in the socket and with a standard light bulb screwed in the socket; and
FIG. 5 is a schematic circuit further explaining the interaction between the socket insert of the present invention and a socket with a conventional four position switch (three positions being schematically illustrated).
Referring now' in greater detail to the various figures of the drawings wherein similar reference characters refer to similar parts, a socket insert for varying the intensity of a light bulb embodying the present invention is generally shown at 10 in FIG. 1. As indicated in FIGS. 1, 2 and 3, socket insert 10 basically comprises a first disc terminal 12 and a second disc terminal 14 mounted in spaced relationship upon an insulating disc 16. A halfwave rectifier 18 has a lead 20 secured to the first disc terminal 12 and a lead 22 secured to the second disc terminal 14 (FIG. 3). An indexing key 24 in the nature of a cylindrical lug depends from the disc body 16.
The socket insert 10, which will be described in greater detail hereinafter, is adapted to be inserted in a screwtype bulb socket 26. As shown in FIGS. 1 and 4, the socket 26 generally comprises an internally threaded conducting inner wall 28 secured to an insulating base 30. An intermediate insulating wall 32 is positioned against the outer surface of the conducting wall 28 and an outer metallic protective covering 34 is positioned against the intermediate wall 32. A cap 36 encloses one end of the socket and terminates in a collar 38 with a set screw 40 to accommodate wiring 42. Knob 44 is provided in the socket body in order to operate the switching means within the socket 26. Projecting upwardly from the insulating base 30 of the socket 26 is a first socket terminal 46 and a socket terminal 48. These terminals are adapted to be sequentially grounded by a turning of the knob 44 so that electric current may alternately flow through either of the terminals 46 and 48 when a conducting member such as abulb is secured in the socket 26. As indicated in FIG. 4, the first socket terminal 46 is in the nature of a resilient blade lying generally parallel to the insulating base 30 whereas the second socket terminal 48 is in the nature of a rigid finger projecting perpendicularly from the base 30.
The socket insert 10 is adapted to be placed in the socket 26 in a manner complementary to the socket terminals 46 and 48. Toward this end the first disc terminal 12 is generally U-shaped and comprises an upper resilient arm 50 generally parallel to but spaced from the upper surface 52 of the disc body 16. The first disc terminal 12 further includes a lower arm 54 disposed against the lower surface 56 of the disc body 16. The lower arm 54 and consequently the entire first disc 12 is secured to the disc body 16 by means of a -metallic rivet 58. A bridging section 60 unites the upper arm 50 and the lower arm 54 of the first disc terminal 12. An opening 62 is provided in disc body 16 in order to accommodate the bridging section 60.
The second disc terminal 14 generally comprises a relatively short piece of conductive material 64 secured against the upper side 52 of the disc body 16. The piece of material 64 terminates in a raised resilient lip 66 which projects above a slot 68 formed in the disc body 16. The second disc terminal 14 is secured to the body 16 by means of a metallic rivet 70.
The keying device 24 is in the nature of a lug depending from a lower surface 56 of the disc body 16 and is adapted to be secured in a complementary opening 72 in the base 30 of the socket 26.
In operation, the knob 44 is adapted to be placed in a high position or to alternately activate either the first socket terminal 46 or the second socket terminal 48. In addition, the knob 44 has a fourth position which is neutral or off. The socket insert 10 is inserted into the socket 26 in a manner as illustrated in FIGS. 1 and 4 so that the keying device 24 is inserted in the complementary opening 72 in socket base 30. When this is done, the first socket terminal 46 is in contact with the first disc terminal 12 either through the rivet 58 or the through the slot 68 to contact the lip 66 of the second,
disc terminal 14. Where desired, further contact between the second socket terminal 43 and the second disc terminal 14 may be achieved through the combination of the metallic rivet 70 and an area of conductive solder or other conductive means bridging the distance between the slot 68 and the rivet 70. Once the disc 16 has been inserted in the socket 10, a light bulb 74 with conducting screw base 76 and a lower terminal 78 supported by insulation 80 from the base 76 may be secured in the socket 26 in the normal manner. When this is done, the terminal 78 of the bulb 74 contacts the first disc terminal 12.
It is thus seen as illustrated schematically in the circuit of FIG. that the current leaving the bulb 74 at the lower bulb terminal 78 will in one position of the knob 44 enter the first disc terminal 12. When the first socket terminal 46 is activated, the current entering the first disc terminal 12 will travel directly to the socket terminal and the light bulb will burn in its full intensity.
However, when the second socket terminal 48 in another position of knob 44 is activated or grounded, the current entering the first disc terminal 12 will travel through the lead 20 to the half-wave rectifier 18, then through the lead 22 of the second disc terminal 14 and finally to the second socket terminal 48. It is thus seen that in the position of the knob 44 as shown by the full line arrow 82 of FIG. 5, the half-wave rectifier 18 is placed in the bulb circuit. In this manner, only substantially one-half of the normal power reaches the bulb 74 and thus the bulb will burn with substantially one-half of its normal intensity. The knob 44 may be turned to an off position and then the foregoing cycle may be repeated. Also, in the high position of knob 44, the bulb also burns with full intensity.
The half-wave rectifier employed in connection wit the present invention is of a well-known construction and is composed of materials, such as, silicon and germanium or other suitable semi-conductive materials.
A satisfactory half-wave rectifier employed with the present invention is a 200 volt silicon rectifier with an elongated shape whereby one side thereof may be positioned conveniently against the straight ledge 82 of the disc body 16 in order to give an overall aspect of roundness of the disc body 16.
It is thus seen that the socket insert of the present invention may be simply placed in any socket with switch means in the nature of a four position switch and that a conventional light bulb may'then be screwed into the socket.
Furthermore, the socket insert of the present invention may be used in varying the voltage output of a socket in connection with speed control of certain types of motors used in fans, pumps, etc.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is, therefore, to be understood that within the scope of the appended claim, the invention may be practiced otherwise than as specifically described.
What is claimed as the invention is:
A socket insert comprising a substantially flat, separable, insulating disc having first and second spaced disc terminals secured thereon and a half-wave rectifier physically and electrically united to said disc terminals, said first disc terminal being positioned on both sides of said disc, and said disc including a slot adjacent said second disc terminal, said slot being adapted to permit a socket terminal to make contact with said second disc terminal, wire leads extending from said half-wave rectfier of each of said disc terminals, and a keying device secured to said disc to permit the seating of said disc in a particular position only.
References Cited by the Examiner UNITED STATES PATENTS I 2,896,125 7/1959 Morton 315 200 X 3,028,525 4/1962 Morton 315 200 X 3,062,986 11/1962 Fritz et al. 315 200 JOHN W. HUCKERT, Primary Examiner.
JAMES D. KALLAM, Examiner.
R. F. POLISSACK, Assistant Examiner.