US1928951A - Voltage indicator - Google Patents

Description

1933- J. c. PENDOCK VOLTAGE INDICATOR Filed Aug. 26, 1932 m r k 4 m ma 6 h w 4S--i:||I|||! f a L 2 11 1 a g WH 2 .1 pm 2 Patented Oct. 3, 1933 PATENT. {OFFICE 7 1,928,951 VOLTAGE mnrcs'roa Jonathan C. Pendock, Toronto, Ontarl Canada I Application August 26,; 1932, Serial No. 630,574, andin Canada June 21, 1932 4 Claims. (Cl.1'1195) In working about-electrical installations, the

' operator often is in doubt as. to the voltage car-- ried by various lines, and the object of my invention is to devise means for readily determining I the voltage of any given circuit, which means is very simple in operation and which at the same time is very simple and reasonably inexpensive in construction.

I attain my object by providing a tubular hous-' It) ing .in which is positioned a solenoid, the movable core of which has mounted thereon avscale adapted, when the winding of the solenoid is energized, to be projected through a hole in the housing, the scale being arranged so that the ex- 16 tent of its projection indicates the voltage of the circuit or line. The device is provided with contacts, provided with suitably insulated hand engaging portions for manipulating purposes, which contacts are in electrical communication with 20 the solenoid winding. The construction is hereinafter more specifically described and illus-' trated in the accompanying drawing in which Fig. 1 is a longitudinal section of the improved indicator; and

Fig. 2 is a similar view showing the. parts in the position assumed in giving an indication.

In the drawing like numerals of reference indicate corresponding parts in the different figures. The indicator comprises a tubular casing 1 of insulating material having a closure 2 at one end and a closure 3 at the other end.

Carried by the closure 2 is a tube 4 of insulating material. On this tube 4 adjacent the closure 2 is mounted a solenoid winding or coil 5. Slidable within the tube 4 is the solenoid core 6, on one end of which is mounted a scale 7 adapted to be projected through a hole in the closure 2. The other end of the core 6 has one end of a coil spring 8 connected thereto, the other end of which is connected with an internally threaded member 9 held adjacent the closure 3 by a screw 10 passing through said closure. This member 9 is also threaded within the end of the sleeve 4 and is provided with a notched end for engagement by a screw driver so that its position in the sleeve 4 may be adjusted.

14 are the lead wires passing through holes in the closure 3, the outer ends of which wires are preferably provided with suitable contacts 11 provided with insulated hand grip portions 12, and the inner ends of the wires connected to the ends of the solenoid winding, preferably through the terminal posts 16 mounted on the underside of the partition 17..

The scale 7 is preferably provided with two sets of indications, one for direct current, and the otherfor alternating current. To prevent possible damage to the spring 8' in the event of pressure being applied to the outer end of the scale, I prefer to provide within it a supporting post to receive the pressure of the end of .the solenoid core when the latter is retracted, This supporting post may be formed on or secured to the end of the member 9. To prevent damage to the edge of the closure 2 adjacent the scale 7, the closure is preferably provided with a metal ring reinforcement 18.

The operation of the device is as follows. The contacts 11 are engaged with the two line wires, and as the solenoid winding 5 is energized, the core 6 is caused to move relative to the winding and the scale is thus projected through the closure 2. The highest exposed graduation of the scale will indicate'the line voltage. After the contacts 11 are disengaged from the line wires, the spring 8 will cause the core to return to its normal position with the scale retracted.

From the above description, it will be seen that I have devised a construction which will satisfactorily attain the object of my invention as set out in the preamble of this specification.

What I claim as my invention is:

1. Inc. voltagev indicatonthe combination of a tubular-body; a closure for one end of said body; a tubular support having one end connected with said closure said closure having a hole formed therethrough in alinement with the tube; a solenoid winding carried by said tubular support adjacent said closure; a solenoid core slidable lon'gitudinally in said tubular support; a scale movable with one end of the core adapted to be projected through said hole; a spring within the tubular support having one end connected to the other end of the solenoid core; a plug in the other end of the tubular support to which the other end of the spring is connected; and. a closure for the other end of the tubular body, said closure forming a support for the other end of the tubular support.

2. In a voltage indicator, the combination of a tubular body; a closure for one end of said body; a tubular support having one end connected with said closure said closure having a hole formed therethrough in alinement with the tube; a. solenoid winding carried by said tubular support adjacent said closure; a solenoid core slidable longitudinally. in said tubular support; a scale movable with one end of the core adapted to be projected through said hole; a spring within the tubular support having one end connected to the said closure said closure having a hole formedtherethrough in alinement with the tube; a solenoid winding carried by said tubular support adjacent said closure; a'solenoid core slidable longitudinally in said tubular support; a scale movable with one end of the core adapted to be projected through said hole; aspring within the tubular support having one end connected to 'the other end of the solenoid core; a plug inithe other end' of the tubular support to which the other end' of-the spring is connected; a closure for the other end of the tubular body, said closure forming a support for the other'end' of the tubular support; and a partition within the tubular body;

and terminals carried by said partition to which the solenoid winding is connected.

4. In a voltage indicator, the combination of a tubular body; a closure for one end of said body; a tubular support having one end connected with said closure, said closure having a hole formed therethrough in alinement with the tube; a solenoid winding carried by said tubular support adjacent said closure; a solenoid core slidable longitudinally in said tubular support; a scale movable with one end of the core adapted to be projected through said hole; a spring within the tubular support having one end connected to the other end of the solenoid core; a plug in the other end of the tubular support to which the other end of the spring is connected, said plug being adjustable longitudinally of said tube; a closure for'the other end of the tubular body, said closure forming a support for the other end of the tubular support; a partition within the tubularbody; and terminals carried by said partition to which the'solenoid winding is connected;

JONATHAN, c. PENDOCK.

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