US2630538A

US2630538A - Electric lamp stand

Info

Publication number: US2630538A
Authority: US
Inventors: Brede Erwin Frank
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-01-27
Filing date: 1950-01-27
Publication date: 1953-03-03
Anticipated expiration: 1970-03-03

Description

March 3, 1953 E. F. BREDE 2,630,538

ELECTRIC LAMP STAND Filed Jan. 27, 1950 2 SHEETS-SHEET l 3m entor 1 (Ittorn March 3, 1953 EFF. 'BREDE 2,630,533

ELECTRIC LAMP STAND Filed Jan. 27, 1950 2 SHEETS-SHEET 2 Q PI INVENTOR.

ER W/NEBREDE Patented Mar. 3, 1953 UNITED STATES PATENT OFFICE ELECTRIC LAMP STAND Erwin Frank Brede, Detroit, Mich.

Application January 27, 1950, Serial No. 140,901

2 Claims. 1

The object of this invention is to provide a portable electric lamp stand offering a system of dual control of the lamp at the two points separated by the length of the lamp cord and integral with the unit construction of the portable lamp.

The purpose of the invention is to eifect more extensive visibility by means of dual control of a portable electric lamp stand to prevent fumbling and stumbling through the dark to control the lamp. One further purpose is to provide such a lamp which can be carried as a complete unit to any place, where a conventional electric outlet receptacle is available, to at once provide use of the system.

Heretofore, and prior to December 1891 an electric circuit has been used which comprises two companion wires connected between two sets of contact points, respectively, of two three-point switches with their blades connected in series with the control line wire so that the circuit may be opened or closed by either of the two switches. The use of the circuit is found in stationary installations and installations composed of several individual parts which can be connected or disconnected by electric wires at will and the terminal wires of the system connected to the power mains. But, obviously, such systems are not readily or conveniently portable.

My invention incorporates such an electric circuit described in the preceding paragraph but makes it an integral part of the structure of the portable dual control electric lamp stand of unit construction.

It is well to remember that for safety, as with any lamp cord, the cord should always be kept out of the path of walk of any individual.

Referring to the drawings:

Figure l is a side elevation of such a lamp except it does not show the plug-switch which, however, is shown in Figure 2. Any ordinary lamp stand may be used for the application of the invention.

Figure 2 is a plan view of the plug-switch, assembled, which plugs into the electric service outlet and provides a means of on and off control of the lamp at that point regardless of the position of the switch on the lamp base.

Figure 3 is an end view of the prong end of the plug-switch, assembled.

Figure 4 is a longitudinal sectional view, having portions thereof in elevation, of the plugswitch.

Figure 5 is an end view of the external endbushing of the housing of the plug-switch.

Figure 6 is an end View of the internal partition made of plastic insulator which, when the plug-switch is assembled, carries the two terminal prongs which plug into the receptacle of the electric service.

Figure 7 is a side elevation of the internal partition.

Figure 8 is an electric circuit diagram of the electric parts and connections of the dual control electric lamp stand including plug-switch, complete.

Referring to the drawings for a detailed description; in Figure 1 the lamp shade is I, and 2 is a customary lzeyless electric socket mounted on top of the center post 4; 3 is one of the four brackets, fastened to the four sides of the center post i, which support the lamp shade l; 5 is a customary switch knob fastened to the shaft of a rotary single pole double throw snap switch mounted in the base piece 1 of the lamp stand; 6 is two nuts on the switch bushing which hold the switch in place; 8 is a thin fiat plate used to conceal the insulation and recess into which the switch is inserted and is held in place by four small screws; 9 and H] are two of four small blocks fastened to the base piece I by glue and screws which provide the feet for the base; II, which also appears in Figures 2, 3, and 4, is a three conductor lamp cord completing the electric circuit from the lamp, Figure 1, to the plugswitch, Figure 2.

Referring to Figure 2, the knob I2 is fastened by a set screw to the shaft of a rotary single pole double throw snap switch 22 in Figure 4. Two lock nuts I3, also shown in Figure 4, hold this snap switch in place. l4, also shown in Figure 4, is the cylindrical part of the housing. l5 and. [6 are two of three small machine screws which are spaced apart and secure the internal partition l9, shown in Figures 4 and 7, to housin I4. These three screws are also shown in Figure 3.

The terminal prongs I1 and I8, also shown in Figure 4, are fastened to the internal partition [9 and are the means of plugging into the electric service outlet.

Referring to Figure 4, the hole 20 in the cylindrical housing I 4 admits the three-conductor lamp cord ll into the plug-switch. 2| is the external end-bushing, also shown in Figure 5, which is cemented to the rest of the housing but can be fastened thereto in any customary manner. 22 is the rotary single pole double throw snap switch of the plug-switch and 23 is the shaft of this switch.

Referring to Figure 5, the small key-seat 25 holds the small key projecting from the periphery of the snap switch secured by lock nuts 13 in Figure 4 when the plug-switch is assembled.

Referring to Figure 6, 26 is one of three tapped holes, spaced 90 apart, to receive the three machine screws designated by l5 and I6, Figures 2 and 3. The hole 2! is one of the two holes which clear the screw ends of the binding screws on the terminal prongs I! and I8, Figures 2 and 4. The hole 28 is one of the two holes which receive the two self-tapping machine screws that secure the terminal prongs to the internal partition I9, and 29 is a slot in the internal partition to receive the three conductors of the three conductor lamp cord for connection to the plug-switch.

Referring to Figure 8, 30 is the blade of the rotary single pole double throw snap switch in the plug-switch and 3! is the blade of the rotary single pole double throw snap switch in the lamp base.

Although this invention is described herein with relation to a specific lamp stand its application is not confined to any specific lamp stand and it is intended to cover any type of lamp stand to which it is applied to efiect the improvements explained herein and coming within the scope of the following claims but it is not intended to include any already existing patent on other improvement embodied in a lamp stand.

I claim:

1. In an electric lamp stand a novel improvement efiected by combining in a single portable unit: the lamp stand, a single pole double throw rotary snap switch mounted in the lamp stand, a three conductor lamp cord, a switch-plug embodying a single pole double throw rotary snap switch combined with two terminal prongs; all so integrated that one end of the three conductor lamp cord is permanently connected in such manner that one or" the conductors thereof is permanently connected to one of the two terminals of the lamp socket, the other two conductors thereof are permanently connected to the set of two contact points, respectively, of the switch mounted in the lamp stand, and the switch blade of this switch is permanently connected to the other socket terminal, the other end of the three conductor lamp cord is permanently connected in such manner that the first conductor is permanently connected to one of the two terminal prongs embodied in the switch-plug (thus one side of the circuit is permanently closed by this first conductor), the other two conductors are permanently connected to the set of two contact points, respectively, of the switch embodied in the switch-plug, and the switch blade of this switch is permanently connected to the other ter minal prong. (thus alternate switching to either of these two remaining wires is effected by either of the two switches to open or close the circuit at either of the two switches).

2. In a portable electric lamp stand comprised in a complete unit, the combination in a single primary unit of a single ole double throw rotary snap switch, integral with two terminal prongs thereby forming a switch-plug of unit construction embodying in its structure one end of a three conductor lamp cord in such manner that: one of the conductors thereof is permanently connected to one of the two terminal prongs; the other terminal prong is permanently connected to the blade of the single pole double throw switch; the second conductor is permanently connected to one of the two contact points of the switch; and the third conductor is permanently connected to the other contact point of the switch.

ERWIN FRANK BREDE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 465,805 Smith et al Dec. 22, 1891 498.312 Scribner May 30, 1893