US1011376A - Rheostat. - Google Patents

Description

G. A. SCHEBFFER.

RHEOSTAT.

APPLICATION Hmm JAN.14, 1910.

1,01 1,376. 1 y Patented Dec. 12, 1911;

. jkl/@1229215 ZM C74/ wr/Lave Zeh/@@7671 M m by UNITED STATES PATENT OFFICE.

GUSTAVE A. SCHEEFFER, 0F INDIANAPOLIS, INDIANA, ASSIGNOR TO COLUMBIA METER COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

RHEOSTAT.

Specification of Letters Patent.

Patented Dec. 12, 1911.

Application led January 14, 1910. Serial No. 538,030.

To all whom it may concern.'

Be it known that I, GUsTAvn A. SCHEEP- rnn, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a certain new and useful Improvement in Rheostats, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to an improved form of rheostat particularly adapted for use in connection with electricity meters adapted to measure a quantity of electricity flowing through any given circuit.

My improved construction provides for accuracy of operation, ease of inspection and repair and durability of working parts.

My invention particularly consists in a rheostat adapted to be connected with the starting coil of an electricity meter in such a manner that by varying the resistance in the rheostat the current through the starting coil may be varied as desired and thus the rotative effect of the starting coil upon the armature may be varied. As a result of this arrangement when the starting coil is connected in series with the armature, as is usually done, the current through the starting coil may be varied to adjust the rotative effort exerted thereby to just balance the friction of the moving parts without, however, changing the current flowing through the armature windings in like manner.

The several drawings illustrating my invention are as follows:

Figure 1 is a face view of a magnetic shield employed in an electric meter, and shows the starting coil rheostat supported from such magnetic shield. Fig. 2 is a sectional view of the rheostat shown in Fig. 1 taken along the line 3 3. Fig. 3 is a sectional view of the rheostat shown in Fig. 1 taken along the line 4 4.

Similar numerals refer to similar parts throughout the several views.

As shown in the drawings, the base 1 supports, by means of two posts, the magnetic shield 20, through which the meter shaft 2 extends. The shaft is provided with a worm engaging a worm wheel 22 supported by a shaft 76, by means of a bracket 21, from the shield 20. The upper end of the shaft 76 carries an arm 77, adapted to engage the crank 78 carried by the integrating mechanism 211 supported by the upper end of the posts by screws 75.

The magnetic shield 20 has secured to it two brackets 64, which support a bolt 65, upon which are mounted the resistance coils 66. Each resistance coil consists of a spool of insulating material upon which the resistance coil is wound, the spools then being mounted upon the bolt or rod 65 with connecting terminals between them. These terminals, as shown in Figs. 2 and 3, consist of metallic rods of small diameter having their inner ends bent around the rod or bolt 65 but insulated therefrom by means of a tube of insulating material 68. The other ends of t-he terminals project outward to be engaged by a connecting socket 72, which preferably is split to facilitate making good electrical contactwith the terminals 67. The socket 72 is connected by means of a conductor 71 with one terminal of the starting coil of the meter, while the conductor 70 is electrically connected at all times with the terminal 69 at one end of the rheostat, such conductor 70 being connected to the other terminal of the starting coil. The terminals of each individual resistance coil 66 are connected to the adjacent terminals 67, as indicated in Figs. 2 and 3. Thus, for example, the inner ends of the individual resistance coils might be connected to the terminals 67 above them, while the outer ends of the same coils are connected to the terminals 67 below them, as shown in Fig. 1. Thus a convenient means is provided for regulating the rotative effect exerted by the starting coil without change of adjustment of the coil, but by causing a greater or less amount of current to flow through the coil in order that the rotative effect exerted upon the armature shall compensate or just balance the friction of the moving parts; this being done without changing the current ilow through the armature windings which are connected in series with the starting coil.

While I have shown my invention in the particular embodiment herein described I do not, however, limit myself to this construction, but desire to claim broadly any equivalent that may suggest itself to those skilled in the art.

What I claim is:

1. A rheostat comprising a supporting rod, resistance coils mounted upon such rod,

an individual insulating core for each coil and terminals supported by such rod between such coils.

2. A rheostat comprising a supporting rod, resistance coils mounted upon such rod, individual insulating spools for such coils and terminal plugs supported by such rod between suoli coils, such plugs adapted to be engaged by aV suitable socket connector to determine the amount of resistance in circuit.

3. A rheostat comprising a metallic rod threaded at its ends7 resistance coils supported by and insulated from such rod, and connector plugs carried by and insulated from such rod between such coils, such plugs connected to the terminals of the resistance coils and clamped in position between the coils by a nut on one end ot the rod.

4. In combination, a plurality of separable resistance elements mounted upon a oominon support, terminals for such elements secured between thein, and a device adapted to be connected with any desired one of such terminals.

In witness whereof, I hereunto subscribe i'ny naine this 28th day of December, A. D.

GUSTAVE A. SGHEEFFER.

Witnesses ALBERT L. Ro, JOHN E. SCOTT.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Yatents, Washington, D. C.

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