US 3048670 A
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Description (OCR text may contain errors)
Aug. 7, 1962 D. w. JACKSON ELECTRICAL SWITCH Filed Aug. 31. 1960 32 Hllm Hlllh V In;
INVENTOR. @avz'd Vl. o/mon BY g ATTORNEY United States Patent Ofifice 3,048,670 Patented Aug. 7, 1962 3,fl4l8,67d ELECTRMIAL SWHTQH David VJ. Jackson, Forrest Paris, Ga. Scripts, Inc, Rt). Box 4847, Atlanta 2, Ga.) Filed Aug. 31, 1960, Ser. No. 53,381 1 (Ilaim. ((11. sea-a4 This invention relates to electrical switches and more particularly to an electrical timing device for initiating, maintaining and terminating chosen electrical circuits in selected sequences.
:Briefly described, the electrical switch of the present invention is characterized by a constant speed motor having an output shaft which carries a conductor template that is positioned for engagement by a plurality of resili ent contact fingers radially arranged with respect to said conductor template so that a given contact finger engages a given arcuate portion of said conductor template during its rotation.
It can readily be seen that by simple Variations of the overall shape of the conductor template and the disposition of the contact fingers variation in circuits may be obtained. The time duration which these circuits are maintained depends upon the length of the arcuate portion which is in contact with a given contact finger. The present electrical switch or electrical timing device provides a simple, economical and reliable timing mechanism where circuits are made and broken in sequence for varied time durations, one illustrative utilization of such a switch being for an electrical display sign which has different advertising messages illuminated in sequence for varied time intervals.
These and other features of the present invention are described in further detail below in connection with the accompanying drawings, in which:
FIG. 1 is a side elevational view of the electrical switch of the present invention;
FIG. 2 is a top plan view of the switch shown in FIG. 1 showing the manner in which the depending flexible contact fingers are connected to one side of an electrical potential source; and
FIG. 3 is a cross sectional view taken along line 3-3 of FIG. 1 showing the radial alignment of the flexible contact fingers with respect to the conductor template.
Referring now in detail to the drawings, the electrical switch, indicated generally by the reference numeral 14 incorporates a frame 12 having a base plate 14 and an upper plate 1 6 which are held in spaced relation with respect to each other by standards 18. A constant speed motor 20 is carried by the base plate 14 and includes an output shaft 22 which carries a revolving, insulated platen 24. Disposed on said revolving, insulated platen 24 is removable conductor template 26 which may be of a varied shape to produce arcuate portions of different lengths at different positions along its radius. An illustrative example of such a conductor template is shown in FIG. 3. Conductor template 26 is electrically connected to one side of the potential source by a suitable conventional electrical connection, such as brush B. Attached to the upper plate 16 are removable, electrical plug-in terminals 28 which carry depending contact fingers 3t). Plug-in terminals 28 may be wired to terminal bars 32 which provide leads to the circuit being activated. It can readily be seen that variations in the overall shape of the conductor template along with the selective arrangement of the depending contact fingers can achieve a plurality of timed, sequential electrical circuits. For example, depending finger 34 which is in contact with a continuous, uninterrupted portion 35 of the conductor template will maintain an uninterrupted circuit. Depending finger 36 on the other hand will maintain an electrical contact for its circuity only as long as it is in contact with the arcuate portion of the conductor template designated by reference numeral 37 which is of a shorter time duration and varied in time sequence from the electrical circuity which is initiated and terminated by the depending finger 38 which contacts the portion of the conductor template designated by reference numeral 39. Circuity can further be varied by having the template slotted as at 40 to interrupt the electrical circuity existing between a selected portion of the conductor template and a depending finger.
The present invention has been described in detail above for purposes of illustration only and is not intended to be limited by this description or otherwise except as defined in the appended claim.
An electrical switch comprising a constant speed motor having an output shaft, an insulated platen mounted on said output shaft, a conductor template removably dis posed on said insulated platen and electrically connected to one side of an electrical potential source, said conductor template being a disc formed with a plurality of arcuate portions of varying length disposed between its center and outer periphery at different points along the radius of said disc, and an electrical plug-in terminal removably positioned in spaced relation to said conductor template and carrying a plurality of stationary resilient contact fingers arranged to provide contact between a given contact finger and a given portion of said conductor template upon rotation thereof to complete a given circuit, the duration of said given circuit being dependent upon the length of the arcuate portion of the conductor template that is in contact with a depending contact finger and the sequence of said given circuit with respect to said other circuits being dependent upon the selective arrangement of said contact fingers with varied portions of said conductor template.
References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS Great Britain Oct. 12, 1926 France Jan. 16, 1907